1. A method for evaluating energy efficiency of an absorption tower of a wet desulphurization system is characterized by comprising the following steps:

calculating the energy consumption N1 of a circulating pump for removing sulfur dioxide in unit mass by an absorption tower of the wet desulphurization system;

calculating resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 of the resistance for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

2. The method for evaluating the energy efficiency of the absorption tower of the wet desulfurization system according to claim 1, further comprising: and calculating the sum P of the power of all circulating pump shafts of the circulating pump shaft power absorption tower.

3. The method for evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to claim 1, wherein the energy consumption of a circulating pump for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system is N1 ═ P x 3600 x 1000)/(Q x C), Q is the amount of flue gas processed by the desulphurization system per hour, and C is the concentration of sulfur dioxide at the inlet of the desulphurization system.

4. The method for evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to claim 1, wherein the energy consumption of the absorption tower of the wet desulphurization system for removing sulfur dioxide per unit mass is N2 ═ R/C, R is the on-way resistance of the absorption tower, and C is the concentration of sulfur dioxide at the inlet of the desulphurization system.

5. The method for evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to claim 1, wherein the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide per unit mass is N1+ N2.

6. The method for evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to claim 1, wherein a larger N12 indicates a higher energy consumption for removing sulfur dioxide per unit mass of the absorption tower of the wet desulphurization system.

7. An energy efficiency evaluation system for an absorption tower of a wet desulphurization system is characterized by comprising:

the first calculation module is used for calculating the energy consumption N1 of the circulating pump for removing sulfur dioxide in unit mass in the absorption tower of the wet desulphurization system;

the second calculation module is used for calculating the resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

and the evaluation module is used for calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the wet desulfurization system absorption tower energy efficiency assessment method according to any one of claims 1 to 6 when executing the computer program.

9. A computer-readable storage medium storing a computer program, wherein the computer program when executed by a processor implements the steps of the wet desulfurization system absorption tower energy efficiency assessment method according to any one of claims 1 to 6.

Background

The Wet Flue Gas Desulfurization (WFGD), especially limestone-gypsum Flue Gas Desulfurization (FGD) is a flue gas desulfurization technique widely used at home and abroad at present. At present, the domestic coal-fired power plants gradually complete the engineering reconstruction of ultra-low emission, the energy consumption of a desulfurization system is more and more concerned, but no simple and easy energy efficiency evaluation method exists for the core equipment absorption tower. The significance of the energy efficiency evaluation of the absorption tower is that objective energy consumption evaluation is carried out on the design of the desulfurization absorption tower with different capacity units and different inlet sulfur dioxide concentrations, so that the design or improvement scheme of the absorption tower with the lowest energy consumption is found out on the premise of meeting the standard emission of sulfur dioxide.

The Chinese patent application with the publication number of CN 111563676A discloses a method for evaluating energy consumption indexes of a desulfurization system based on various influence factors, which is characterized in that the total power consumption of the desulfurization system is compared with the total power generation amount of a corresponding unit, and then the energy consumption indexes influenced by various factors are obtained finally through correction. The method cannot carry out technical comparison of energy consumption indexes on desulfurization systems with different inlet sulfur dioxide concentrations and desulfurization systems with different inlet flue gas volumes (different unit capacities). When the desulfurization system contains different ranges (some systems contain booster fans and some systems do not contain), even if the concentration of sulfur dioxide at the inlet and the amount of flue gas are the same, the difference of the energy consumption indexes is larger, and the energy consumption indexes of the design scheme of the absorption tower of the desulfurization system cannot be objectively compared, so that the evaluation accuracy is poorer.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a method, a system, equipment and a storage medium for evaluating the energy efficiency of an absorption tower of a wet desulphurization system, wherein the method, the system, the equipment and the storage medium can accurately evaluate the energy efficiency of the absorption tower of the wet desulphurization system.

In order to achieve the above object, the method for evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the present invention comprises:

calculating the energy consumption N1 of a circulating pump for removing sulfur dioxide in unit mass by an absorption tower of the wet desulphurization system;

calculating resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 of the resistance for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

Further comprising: and calculating the sum P of the power of all circulating pump shafts of the circulating pump shaft power absorption tower.

The energy consumption N1 of a circulating pump for removing sulfur dioxide in unit mass by an absorption tower of the wet desulphurization system is (P x 3600 x 1000)/(Q x C), Q is the amount of flue gas processed by the desulphurization system per hour, and C is the concentration of sulfur dioxide at the inlet of the desulphurization system.

The resistance energy consumption N2 of the wet desulfurization system absorption tower for removing sulfur dioxide in unit mass is R/C, R is the on-way resistance of the absorption tower, and C is the concentration of sulfur dioxide at the inlet of the desulfurization system.

The variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass is N1+ N2.

The larger N12 indicates that the energy consumption for removing sulfur dioxide in unit mass by the absorption tower of the wet desulphurization system is higher.

An energy efficiency evaluation system for an absorption tower of a wet desulphurization system comprises:

the first calculation module is used for calculating the energy consumption N1 of the circulating pump for removing sulfur dioxide in unit mass in the absorption tower of the wet desulphurization system;

the second calculation module is used for calculating the resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

and the evaluation module is used for calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

A computer apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the wet desulfurization system absorber tower energy efficiency assessment method when executing the computer program.

A computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the wet desulfurization system absorption tower energy efficiency assessment method.

The invention has the following beneficial effects:

when the method, the system, the equipment and the storage medium for evaluating the energy efficiency of the absorption tower of the wet desulphurization system are specifically operated, the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system is calculated according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system and the resistance energy consumption N2 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and the energy efficiency of the absorption tower of the wet desulphurization system is evaluated according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, namely, the larger the variable energy consumption N12 is, the higher the energy efficiency of the absorption tower of the wet desulphurization system is shown, so that the method, the system, the equipment and the storage medium are simple and convenient to operate, and have higher accuracy.

Detailed Description

The following detailed description is exemplary in nature and is intended to provide further details of the invention. Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.

The desulfurization system of the coal-fired power plant mainly comprises: the energy consumption of the pulping and dehydrating system and the total sulfur dioxide amount obtained by multiplying the flue gas amount at the inlet of the desulfurization system and the sulfur dioxide concentration (inlet boundary condition) in the flue gas are in a direct proportion relation. That is, for different capacity units and different inlet sulfur dioxide concentrations, the energy consumption of pulping and dewatering systems corresponding to the removal of sulfur dioxide in unit mass is approximately the same. The absorption tower belongs to the largest nonstandard equipment in a desulfurization system, and the energy consumption of the absorption tower is closely related to the boundary conditions (flue gas volume and sulfur dioxide concentration) of an inlet and an outlet and also related to the design scheme of the absorption tower. For the absorption tower, the most significant influence on the energy consumption is the energy consumption of the circulating pump and the energy consumption of the on-way resistance, the energy consumption of other parts such as slurry oxidation and stirring is also in direct proportion to the total sulfur dioxide removal amount, and the analysis shows that the energy consumption difference of the absorption tower determines the energy consumption difference of the desulfurization system, and the main influence on the energy consumption difference of the absorption tower is the energy consumption of the circulating pump and the energy consumption of the on-way resistance.

Example one

The energy efficiency evaluation method for the absorption tower of the wet desulphurization system comprises the following steps:

calculating the energy consumption N1 of a circulating pump for removing sulfur dioxide in unit mass by an absorption tower of the wet desulphurization system;

calculating resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 of the resistance for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

Further comprising: and calculating the sum P of the power of all circulating pump shafts of the circulating pump shaft power absorption tower.

The energy consumption N1 of a circulating pump for removing sulfur dioxide in unit mass by an absorption tower of the wet desulphurization system is (P x 3600 x 1000)/(Q x C), Q is the amount of flue gas processed by the desulphurization system per hour, and C is the concentration of sulfur dioxide at the inlet of the desulphurization system.

The resistance energy consumption N2 of the wet desulfurization system absorption tower for removing sulfur dioxide in unit mass is R/C, R is the on-way resistance of the absorption tower, and C is the concentration of sulfur dioxide at the inlet of the desulfurization system.

The variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass is N1+ N2.

The larger N12 indicates that the energy consumption for removing sulfur dioxide in unit mass by the absorption tower of the wet desulphurization system is higher.

Example two

An energy efficiency evaluation system for an absorption tower of a wet desulphurization system comprises:

the first calculation module is used for calculating the energy consumption N1 of the circulating pump for removing sulfur dioxide in unit mass in the absorption tower of the wet desulphurization system;

the second calculation module is used for calculating the resistance energy consumption N2 of the absorption tower of the wet desulphurization system for removing sulfur dioxide in unit mass;

and the evaluation module is used for calculating the variable energy consumption N12 of the absorption tower of the wet desulphurization system for removing the sulfur dioxide in unit mass according to the energy consumption N1 of the circulating pump for removing the sulfur dioxide in unit mass and the energy consumption N2 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system, and evaluating the energy efficiency of the absorption tower of the wet desulphurization system according to the variable energy consumption N12 for removing the sulfur dioxide in unit mass of the absorption tower of the wet desulphurization system.

EXAMPLE III

A computer apparatus comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the wet desulfurization system absorber tower energy efficiency assessment method when executing the computer program.

Example four

A computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the wet desulfurization system absorption tower energy efficiency assessment method.

EXAMPLE five

In this embodiment, energy efficiency comparison of absorption towers is performed by taking absorption towers of four coal-fired unit desulfurization systems of three coal-fired power plants as an example (all implement ultra-low emission standard), wherein initial conditions are shown in table 1:

TABLE 1

In table 1, the sulfur dioxide concentration is given in units of: milligram per cubic meter, standard state, wet basis, 6% oxygen; the unit of the smoke gas amount is as follows: cubic meter per hour, the state is standard state, actual oxygen; the resistance of the absorption tower does not include the resistance of front and rear flues and other equipment outside the tower; the total flow and total shaft power of the circulating pump are the sum of the flow and shaft power of all circulating pumps of the absorption tower; the absorption tower 3 is composed of two absorption towers connected in series, and the rest are single towers.

The calculation results are shown in table 2:

TABLE 2

	Unit of	Absorption tower 1	Absorption tower 2	Absorption tower 3	Absorption tower 4
						N1	J/mg	1.45	1.20	1.97	2.61
N2	J/mg	0.45	0.59	0.30	0.69
						N12	J/mg	1.90	1.79	2.26	3.31

From the comparison of energy efficiency indexes, it can be seen that the concentration of sulfur dioxide at the inlet of the absorption tower is high, the flue gas treatment amount is large, the variable energy consumption N12 for removing sulfur dioxide per unit mass of the absorption tower is low, the energy efficiency for removing pollutants per unit mass of the absorption tower is high correspondingly, and the absorption tower with low energy efficiency (high N12 value) is further optimized to reduce the variable energy consumption N12.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.