1. A water balance control method of an open-circuit circulating water system is characterized by comprising the following steps:

calculating the average concentration multiple N of the water system in the first period_i；

Determining the average concentration factor N_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is an adjustment coefficient;

according to the target value N of the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1；

Judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing;

if the water is single-water-quality water supplement, setting the minimum value of the concentration times corresponding to the components of the current single-water-quality water supplement as the concentration time N, and if N is the single-water-quality water supplement, setting the minimum value as the concentration time N<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2And the recommended value Q of the total water supply amount_ms= Q_ms2(ii) a If N is more than or equal to N_n，Q_ms= Q_ms1；

If the water quality is double-water-quality water supplement, calculating a first water quality water supplement amount in the respective double water qualities according to the index values of all the components of the current double-water-quality water supplement, and taking the minimum value as a first water quality water supplement amount recommended value Q_mrs(ii) a At this time Q_ms= Q_ms1Recommended value Q of second water quality water supply amount in double water qualities_mds= Q_ms- Q_mrs。

2. The method of claim 1, wherein the average concentration factor N of the water system over the first period is calculated_iThe method comprises the following steps:

calculating the accumulated quantity Q of the evaporated water quantity of the water system in the first period_ei；

According to the accumulated quantity Q of the evaporated water quantity_eiAnd the first water quality water supplement amount accumulated quantity Q in the first period_mriSecond water quality water supplement amount accumulation Q_mdiCalculating the average concentration multiple N of the water system in the first period_i：

。

3. Method according to claim 2, characterized in that said calculation of the accumulated quantity Q of evaporated water of the water system during the first period_eiThe method comprises the following steps:

obtain the cooling tower of the water systemUpper column temperature T₁Lower column temperature T₂And instantaneous quantity Q of circulating water_r；

Obtaining local humidity RH and local air temperature T, and obtaining an evaporation coefficient k according to the humidity RH and the air temperature T;

calculating the instantaneous evaporation water quantity Q_e：

According to the instantaneous evaporation water quantity Q_ePerforming integral operation in a first period to obtain the accumulated quantity Q of the evaporated water quantity of the water system_ei：

Wherein, T₀Is the length of the first period.

4. The method of claim 3, wherein the target value N is based on a short term concentration factor_nCalculating a first total water supplement recommended value Q_ms1The method comprises the following steps:

。

5. the method of claim 1, wherein the calculating the first water quality water supply amount in each dual water quality according to the index values of the components of the current dual water quality water supply comprises calculating according to the following formulas:

wherein the content of the first and second substances,、、respectively taking the total hardness first water quality water supplement amount, the salt content first water quality water supplement amount and the chloride ion first water quality water supplement amount;、、respectively setting a total water supplementing operation total hardness limit value, a total water supplementing operation salt content limit value and a total water supplementing operation chloride ion limit value;、、respectively supplementing water to the current second water quality with total hardness, supplementing water to the current second water quality with salt content and supplementing water to the current second water quality with chloride ions;、、the total hardness of the current first water quality water supplement, the salt content of the current first water quality water supplement and the chloride ions of the current first water quality water supplement are respectively.

6. The water balance control device of the open-circuit circulating water system is characterized by comprising an average concentration multiple calculation module, a short-term concentration multiple target value calculation module and a total water supplement recommended value calculation module; wherein the content of the first and second substances,

the average concentration multiple calculation module is used for calculating the average concentration multiple N of the water system in a first period_i；

The short-term concentration multiple target value calculating module is used for calculating a short-term concentration multiple target value N_n: determining the average concentration factor N_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is an adjustment coefficient;

the total water supplement suggested value calculation module is used for calculating the total water supplement: according to the target value N of the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1(ii) a Judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing; if the water is single-water-quality water supplement, setting the minimum value of the concentration times corresponding to the components of the current single-water-quality water supplement as the concentration time N, and if N is the single-water-quality water supplement, setting the minimum value as the concentration time N<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2And the recommended value Q of the total water supply amount_ms= Q_ms2(ii) a If N is more than or equal to N_n，Q_ms= Q_ms1(ii) a If the water is double-water-quality water replenishing, calculating the index values of all the components according to the current double-water-quality water replenishingThe first water quality water supplement amount in the double water qualities is taken as a first water quality water supplement amount suggested value Q_mrs(ii) a At this time Q_ms= Q_ms1Second water quality water supply recommended value Q_mds= Q_ms- Q_mrs。

7. The apparatus of claim 6, wherein the short term concentration factor target calculation module calculates an average concentration factor N of the water system during the first period_iThe method comprises the following steps:

calculating the accumulated quantity Q of the evaporated water quantity of the water system in the first period_ei；

According to the accumulated quantity Q of the evaporated water quantity_eiAnd the second water quality water supplement amount accumulated quantity Q in the first period_mdiFirst water quality water supplement amount accumulation Q_mriCalculating the average concentration multiple N of the water system in the first period_i：

。

8. The apparatus of claim 7, wherein the short term concentration multiple target value calculation module calculates an accumulated quantity Q of evaporated water in the water system during the first period_eiThe method comprises the following steps:

obtaining the upper tower temperature T of the cooling tower of the water system₁Lower column temperature T₂And instantaneous quantity Q of circulating water_r；

Obtaining local humidity RH and local air temperature T, and obtaining an evaporation coefficient k according to the humidity RH and the air temperature T;

calculating the instantaneous evaporation water quantity Q_e：

According to the instantaneous evaporation water quantity Q_ePerforming an integration operation in a first period to obtainThe accumulated quantity Q of the evaporation water of the water system_ei：

Wherein, T₀Is the length of the first period.

9. The apparatus of claim 8, wherein the total water supplement recommended value calculation module calculates the total water supplement recommended value according to a short term concentration factor target value N_nCalculating a first total water supplement recommended value Q_ms1The method comprises the following steps:

。

10. the apparatus of claim 9, wherein the total recommended water replenishment quantity calculation module calculates a first water quality replenishment quantity in each of the dual water qualities according to the index values of the components of the current dual water qualities, and includes the following formulas:

wherein the content of the first and second substances,、、respectively taking the total hardness first water quality water supplement amount, the salt content first water quality water supplement amount and the chloride ion first water quality water supplement amount;、、respectively setting a total water supplementing operation total hardness limit value, a total water supplementing operation salt content limit value and a total water supplementing operation chloride ion limit value;、、respectively supplementing water to the current second water quality with total hardness, supplementing water to the current second water quality with salt content and supplementing water to the current second water quality with chloride ions;、、the total hardness of the current first water quality water supplement, the salt content of the current first water quality water supplement and the chloride ions of the current first water quality water supplement are respectively.

Background

At present, most enterprises use the management working mode of the drainage to monitor and control through the industrial control interface of each workshop/pump house, manually record and arrange and report each data parameter, the technical staff obtains the water evaluation index and the overall index of the area/whole plant after summarizing and analyzing, and the dispatching and optimization of the drainage for the whole plant are carried out according to the experience. There is a lack of uniform management and control.

Disclosure of Invention

Based on the above situation in the prior art, the present invention aims to provide a method and a device for controlling water balance of an open-loop circulating water system, which can improve the efficiency of water balance control by guiding the control of water supplement amount through the comparison of average concentration multiple and long-term concentration multiple.

To achieve the above object, according to one aspect of the present invention, there is provided a water balance control method of an open circulating water system, comprising the steps of:

calculating the average concentration multiple N of the water system in the first period_i；

Determining the average concentration factor N_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is an adjustment coefficient;

according to the target value N of the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1；

Judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing;

if the water is single-water-quality water supplement, setting the minimum value of the concentration times corresponding to the components of the current single-water-quality water supplement as the concentration time N, and if N is the single-water-quality water supplement, setting the minimum value as the concentration time N<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2And the recommended value Q of the total water supply amount_ms= Q_ms2(ii) a If N is more than or equal to N_n，Q_ms= Q_ms1；

If the water quality is double-water-quality water supplement, calculating a first water quality water supplement amount in the respective double water qualities according to the index values of all the components of the current double-water-quality water supplement, and taking the minimum value as a first water quality water supplement amount recommended value Q_mrs(ii) a At this time Q_ms= Q_ms1Recommended value Q of second water quality water supply amount in double water qualities_mds= Q_ms- Q_mrs。

Further, the average concentration multiple N of the water system in the first period is calculated_iThe method comprises the following steps:

calculating the accumulated quantity Q of the evaporated water quantity of the water system in the first period_ei；

According to the accumulated quantity Q of the evaporated water quantity_eiAnd the first water quality water supplement amount accumulated quantity Q in the first period_mriSecond water quality water supplement amount accumulation Q_mdiCalculating the average concentration multiple N of the water system in the first period_i：

。

Further, the accumulated quantity Q of the evaporation water quantity of the water system in the first period is calculated_eiThe method comprises the following steps:

obtaining the upper tower temperature T of the cooling tower of the water system₁Lower column temperature T₂And instantaneous quantity Q of circulating water_r；

Obtaining local humidity RH and local air temperature T, and obtaining an evaporation coefficient k according to the humidity RH and the air temperature T;

calculating the instantaneous evaporation water quantity Q_e：

According to the instantaneous evaporation water quantity Q_ePerforming integral operation in a first period to obtain the accumulated quantity Q of the evaporated water quantity of the water system_ei：

Wherein, T₀Is the length of the first period.

Further, the target value N is obtained according to the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1The method comprises the following steps:

。

further, the calculating of the first water quality water replenishing amount in the respective double water quality according to the index values of the components of the current double water quality water replenishing comprises calculating according to the following formulas:

wherein the content of the first and second substances,、、respectively taking the total hardness first water quality water supplement amount, the salt content first water quality water supplement amount and the chloride ion first water quality water supplement amount;、、respectively setting a total water supplementing operation total hardness limit value, a total water supplementing operation salt content limit value and a total water supplementing operation chloride ion limit value;、、respectively supplementing water to the current second water quality with total hardness, supplementing water to the current second water quality with salt content and supplementing water to the current second water quality with chloride ions;、、the total hardness of the current first water quality water supplement, the salt content of the current first water quality water supplement and the chloride ions of the current first water quality water supplement are respectively.

According to another aspect of the invention, a water balance control device of an open-circuit circulating water system is provided, which comprises an average concentration multiple calculation module, a short-term concentration multiple target value calculation module and a total water supplement recommended value calculation module; wherein the content of the first and second substances,

the average concentration multiple calculating module is used for calculating the waterAverage concentration multiple N of system in first period_i；

The short-term concentration multiple target value calculating module is used for calculating a short-term concentration multiple target value N_n: determining the average concentration factor N_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is an adjustment coefficient;

the total water supplement suggested value calculation module is used for calculating the total water supplement: according to the target value N of the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1(ii) a Judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing; if the water is single-water-quality water supplement, setting the minimum value of the concentration times corresponding to the components of the current single-water-quality water supplement as the concentration time N, and if N is the single-water-quality water supplement, setting the minimum value as the concentration time N<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2And the recommended value Q of the total water supply amount_ms= Q_ms2(ii) a If N is more than or equal to N_n，Q_ms= Q_ms1(ii) a If the water quality is double-water-quality water supplement, calculating a first water quality water supplement amount in the respective double water qualities according to the index values of all the components of the current double-water-quality water supplement, and taking the minimum value as a first water quality water supplement amount recommended value Q_mrs(ii) a At this time Q_ms= Q_ms1Second water quality water supply recommended value Q_mds= Q_ms- Q_mrs。

Further, the short-term concentration multiple target value calculation module calculates the average concentration multiple N of the water system in the first period_iThe method comprises the following steps:

calculating the accumulated quantity Q of the evaporated water quantity of the water system in the first period_ei；

According to the accumulated quantity Q of the evaporated water quantity_eiAnd the second water quality water supplement amount accumulated quantity Q in the first period_mdiFirst water quality water supplement amount accumulation Q_mriCalculating the average concentration multiple N of the water system in the first period_i：

。

Further, the short-term concentration multiple target value calculation module calculates the accumulated quantity Q of the evaporation water quantity of the water system in the first period_eiThe method comprises the following steps:

obtaining the upper tower temperature T of the cooling tower of the water system₁Lower column temperature T₂And instantaneous quantity Q of circulating water_r；

Obtaining local humidity RH and local air temperature T, and obtaining an evaporation coefficient k according to the humidity RH and the air temperature T;

calculating the instantaneous evaporation water quantity Q_e：

According to the instantaneous evaporation water quantity Q_ePerforming integral operation in a first period to obtain the accumulated quantity Q of the evaporated water quantity of the water system_ei：

Wherein, T₀Is the length of the first period.

Further, the total water supplement recommended value calculation module calculates the total water supplement recommended value according to a short-term concentration multiple target value N_nCalculating a first total water supplement recommended value Q_ms1The method comprises the following steps:

。

further, the total water supplement recommended value calculation module calculates a first water quality water supplement amount in each double water quality according to the index values of the components of the current double water quality, and the calculation comprises the following calculation according to the following formulas:

wherein the content of the first and second substances,、、respectively taking the total hardness first water quality water supplement amount, the salt content first water quality water supplement amount and the chloride ion first water quality water supplement amount;、、respectively setting a total water supplementing operation total hardness limit value, a total water supplementing operation salt content limit value and a total water supplementing operation chloride ion limit value;、、respectively supplementing water to the current second water quality with total hardness, supplementing water to the current second water quality with salt content and supplementing water to the current second water quality with chloride ions;、、the total hardness of the current first water quality water supplement, the salt content of the current first water quality water supplement and the chloride ions of the current first water quality water supplement are respectively.

In summary, the present invention provides a method and a device for controlling water balance of an open-loop circulating water system, which calculate an average concentration multiple within a certain time by an evaporation water amount accumulation amount and a water supplement amount accumulation amount, compare the average concentration multiple with a preset long-term concentration multiple, and control a total water supplement amount according to a comparison result, so that the water system keeps running at the concentration multiple or sets a short-term target to allow the water system to slowly approach to an expected concentration multiple, so that the water system further approaches to a limit. On the basis, the recommended water replenishing amount is obtained according to the water quality limit value of the circulating water and the water amount balance under different conditions of single-water-quality water replenishing and double-water-quality water replenishing so as to indicate the water replenishing control of the water system. Therefore, the water system can be maintained at the limit of the water system, and the self capacity of the water system can be exerted to a greater extent.

Drawings

FIG. 1 is a flow chart of a method for controlling the amount of water supply to an open-circuit circulating water system according to the present invention;

FIG. 2 is a block diagram showing the constitution of a water replenishment amount control device for an open-circuit circulating water system according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to a first embodiment of the present invention, there is provided a water balance control method for an open circulating water system, the method having a flow chart as shown in fig. 1, comprising the steps of:

step 1, calculating the average concentration multiple N of the water system in a first period_iThe first period may be, for example, the last week, a month, or a time range of other length, which may be set according to actual needs. Specifically, the following steps can be performed:

step 11, calculating the accumulated quantity Q of the evaporation water quantity of the water system in the first period_ei. The reliability of calculating the concentration multiple by adopting the evaporation water amount is higher, the average concentration multiple in a period of time of a circulating water system is considered to be calculated, and if the water displacement, the water supplement amount and the wind loss water amount are used for calculation, the huge error when the water system is crossed or leaked in a large amount cannot be solved. And the concentration times are calculated by using the water supplement amount and the evaporation water amount, and the calculation of the water supplement amount and the evaporation water amount is accurate, so that a more reliable result can be obtained.

The accumulated quantity Q of the evaporated water_eiCan be calculated according to the following steps:

obtaining the upper tower temperature T of the cooling tower of the water system₁Lower column temperature T₂And instantaneous quantity Q of circulating water_r；

And acquiring local humidity RH and local air temperature T, and obtaining an evaporation coefficient k according to the humidity RH and the air temperature T, wherein the evaporation coefficient k can be inquired according to a humidity-air temperature table.

Calculating the instantaneous evaporation water quantity Q_e：

Calculation frequency Q of instantaneous evaporation water volume_eUsually with the instantaneous quantity Q of the circulating water_rThe sampling frequency of (a) is the same and real-time data is acquired in time.

According to the instantaneous evaporation water quantity Q_ePerforming integral operation in a first period to obtain the evaporated water of the water systemQuantity accumulated quantity Q_ei：

Wherein, T₀Is the length of the first period.

Step 12, accumulating quantity Q according to the evaporation water quantity_eiAnd the second water quality water supplement amount accumulated quantity Q in the first period_mdiFirst water quality water supplement amount accumulation Q_mriCalculating the average concentration multiple N of the water system in the first period_i：

。

The water replenishing of the water system comprises various water replenishing qualities, such as first-level desalted water, recycled water replenishing and the like. When calculating the average concentration multiple, two main characteristic water qualities are calculated, and the calculated average concentration multiple is set as a first water quality and a second water quality step 2, and the average concentration multiple N is judged_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is the adjustment coefficient.

Calculating average concentration multiple N in the first period according to the accumulated amount of evaporated water and the accumulated amount of water supplement_iAnd mixing it with the long-term concentration multiple N set in advance_aBy comparison, if N_i≥N_aIf the water system operation reaches or exceeds the expected capacity, the current task is to maintain the concentration factor operation and replace the original long-term concentration factor target value N with the current actual concentration factor_aTo allow the system to further approach its own reach limit. If N is present_i<N_aSetting a short term target N, indicating that the system has not yet reached the desired target_n=N_i+(N_a-N_i) R, let the water system slowThe desired concentration factor is approached, wherein the adjustment factor may be, for example, 0.1. The technical scheme has the advantage that N is used_aThe water supply system is artificially set, the actual water system can not reach, but under the setting, when the water system reaches the actual limit which can be reached by the water system, the recommended value of the water supply amount is given, the water system is always poor and cannot be actually reached, but the water system can be maintained at the limit, so that the self capacity of the water system is exerted to a greater extent.

Step 3, according to the short-term concentration multiple target value N_nCalculating a first total water supplement recommended value Q_ms1：

。

Step 4, judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing, wherein generally speaking, the single-water-quality water replenishing can be recycled water replenishing, primary desalted water replenishing or other water quality water replenishing; the double-water-quality water replenishing can be recycled water replenishing and primary desalted water replenishing or combined water replenishing of other two water qualities. For a circulating water system for supplementing water with single water quality, whether the water quality meets the limit value requirement needs to be checked, and if the water quality does not meet the limit value requirement, the water supplementing quantity is given according to the concentration multiple obtained by the water quality; for a water system for mixing two water qualities for water supplement, the water supplement proportion is required to be obtained through water quality and water quantity balance.

And if the water is single-water-quality water replenishing, setting the minimum value in the concentration times corresponding to all the components of the current single-water-quality water replenishing as the concentration time N, and marking the water-quality saturation of the water replenishing which the maximum value source is. Wherein, the concentration multiple corresponding to each component of the current single-water-quality water supplement can be calculated according to the following formula:

wherein the content of the first and second substances,in order to obtain a concentration factor for the total hardness,is the concentration coefficient of the salt content,the concentration coefficient of the chloride ions is shown as,the total hardness of the current water supplement is,the salt content of the current water supplement is,for the content of the chloride ions which are supplemented with water at present,for the total hardness limit of the circulating water run,for the circulating water to run the salt content limit,for the circulating water operating chloride limit, m is a first limit factor, which may be set to 0.9, for example. The highest achievable concentration factor is calculated in this way by maintaining the operating water quality of the circulating water at, for example, 90% of the limit value for the water quality of the circulating water.

If N is present<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2The calculation method is the same and Q_ms2Same, wherein N_nReplacing the N with N; at this time, the recommended value Q of the total water supplement amount_ms= Q_ms2；

If N is more than or equal to N_n，Q_ms= Q_ms1。

If the water is double-water-quality water supplement, calculating the first water-quality water supplement amount according to the index values of the components of the current double-water-quality water supplement, and calculating according to the following formulas:

solving according to the total hardness water quantity and water quality balance to obtain:

and solving according to the water quality balance of the salt content water quantity to obtain:

solving according to the water quantity and water quality balance of the chloride ions to obtain:

wherein the content of the first and second substances,、、respectively taking the total hardness first water quality water supplement amount, the salt content first water quality water supplement amount and the chloride ion first water quality water supplement amount;、、respectively setting a total water supplementing operation total hardness limit value, a total water supplementing operation salt content limit value and a total water supplementing operation chloride ion limit value;、、respectively supplementing water to the current second water quality with total hardness, supplementing water to the current second water quality with salt content and supplementing water to the current second water quality with chloride ions;、、respectively supplementing water to the current first water quality with total hardness, supplementing water to the current first water quality with salt content and supplementing water to the current first water quality with chloride ions;

comparing the first water quality water replenishing quantities, and taking the minimum value as a first water quality water replenishing quantity recommended value Q_mrs(ii) a At this time Q_ms= Q_ms1Second water quality water supply recommended value Q_mds= Q_ms- Q_mrs。

Wherein, it is also necessary to use N_nAnd each circulating water operation limit index including a circulating water operation total hardness limitCirculating water operating salt content limitCirculating water operating chloride limitCalculated at a concentration factor of N_nUnder the condition of (1), the highest allowable water replenishing water quality limit value and the total water replenishing operation total hardness limit value TH_ms、D_ms、Cl_ms：

Where n is the second limit coefficient, and may be set to 0.9, for example. Based on the existing limit, e.g. 90% (the circulating water controls the operating water quality to 90% of the limit, so it is multiplied by 90%), and the calculated short-term concentration factor target N_nAnd calculating the highest water quality allowed by water supplement according to a method for calculating the concentration multiple of the water quality, wherein the highest allowable value of the water quality after two water supplement hypotheses are mixed is obtained by calculation at the moment because two water supplements are actually used.

Under the two water quality moisturizing circumstances, two strands of moisturizing water quantums add and equal to total moisturizing volume, according to the water balance: q_mds + Q_mrs= Q_ms

Mixing the water qualities of the two water replenishing processes to obtain the mixed water quality of the total water replenishing, namely the total water replenishing operation chloride ion limit Cl obtained in the above_ms. According to the water quality balance of chloride ions:

Q_mds * Cl_m1 + Q_mrs * Cl_m2 = Q_ms* Cl_ms

q can be obtained by simultaneous solving_mds、Q_mrsThe respective values. In the same way, the simultaneous equation of other two water quality indexes and water quantity can be obtained. Comparing the three, get Q_mdThe maximum solution. Get Q_mdThe biggest reason is that the other two must beBut does not satisfy the maximum Q_mdThe water quality limit corresponding to this water quality, i.e. Q among the three values_mdCan meet the limit requirements of the three water qualities.

According to another embodiment of the present invention, a water balance control device for an open-circuit circulating water system is provided, which is configured as shown in fig. 2, and includes an average concentration multiple calculation module, a short-term concentration multiple target value calculation module, and a total water supplement recommended value calculation module.

The average concentration multiple calculation module is used for calculating the average concentration multiple N of the water system in a first period_i。

The short-term concentration multiple target value calculating module is used for calculating a short-term concentration multiple target value N_n: determining the average concentration factor N_iWhether or not to be greater than or equal to the target value N of the long-term concentration multiple_aIf N is present_i≥N_aThen, the short-term concentration multiple target value N_n=N_i(ii) a If N is present_i<N_aThen N is_n=N_i+(N_a-N_i) R, r is the adjustment coefficient.

The total water supplement suggested value calculation module is used for calculating the total water supplement: according to the target value N of the short-term concentration multiple_nCalculating a first total water supplement recommended value Q_ms1(ii) a Judging whether the water system is single-water-quality water replenishing or double-water-quality water replenishing; if the water is single-water-quality water supplement, setting the minimum value of the concentration times corresponding to the components of the current single-water-quality water supplement as the concentration time N, and if N is the single-water-quality water supplement, setting the minimum value as the concentration time N<N_nCalculating a second total water supplement recommended value Q according to the concentration multiple N_ms2And the recommended value Q of the total water supply amount_ms= Q_ms2(ii) a If N is more than or equal to N_n，Q_ms= Q_ms1(ii) a If the water quality is double water quality water supply, calculating respective first water quality water supply amount according to the index values of all the components of the current double water quality water supply, and taking the minimum value as a first water quality water supply amount recommended value Q_mrs(ii) a At this time Q_ms= Q_ms1Second water quality water supply recommended value Q_mds= Q_ms- Q_mrs。

The specific calculation steps adopted in each calculation module are the same as those described in the above first embodiment of the present invention, and are not described herein again.

In summary, the present invention relates to a method and a device for controlling water balance of an open-loop circulating water system, which calculate an average concentration multiple within a certain time by an evaporation water amount accumulation amount and a water supplement amount accumulation amount, compare the average concentration multiple with a preset long-term concentration multiple, and control a total water supplement amount according to a comparison result, so that the water system keeps running at the concentration multiple or sets a short-term target to allow the water system to slowly approach to an expected concentration multiple, so that the water system further approaches to a limit. On the basis, the recommended water replenishing amount is obtained according to the water quality limit value of the circulating water and the water amount balance under different conditions of single-water-quality water replenishing and double-water-quality water replenishing so as to indicate the water replenishing control of the water system. Therefore, the water system can be maintained at the limit of the water system, and the self capacity of the water system can be exerted to a greater extent.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.