1. A method for measuring the content of calcium hydroxide in a flue gas desulfurizer is characterized by comprising the following steps:

under the diffraction condition, measuring the integral intensity of a calcium hydroxide phase in a sample to be detected of the flue gas desulfurizer;

finding out the content of the calcium hydroxide in the calibration curve according to the measured integral intensity of the calcium hydroxide phase of the sample to be detected to obtain the content of the calcium hydroxide in the sample to be detected; and the calibration curve is obtained by drawing by measuring the integral intensity of the calcium hydroxide phase in the standard sample with different content of calcium hydroxide according to the same diffraction condition as that of the calcium hydroxide phase in the sample to be measured for measuring the flue gas desulfurization agent.

2. The method for determining the content of calcium hydroxide in a flue gas desulfurization agent according to claim 1, wherein at least 2 samples to be determined in the same batch are prepared for the samples to be determined, the integral intensities of the calcium hydroxide phases of the 2 samples to be determined are respectively determined, the content of calcium hydroxide corresponding to the integral intensities is found out in a calibration curve, and the content of calcium hydroxide in the samples to be determined is determined according to the content of calcium hydroxide in the 2 samples to be determined.

3. The method for measuring the content of the calcium hydroxide in the flue gas desulfurization agent according to claim 1, wherein the method further comprises: respectively measuring the integral intensity of the calcium hydroxide phase in the standard sample with different calcium hydroxide contents under the same diffraction condition as that of the calcium hydroxide in the sample to be measured of the flue gas desulfurization agent, drawing a working curve of the integral intensity of the calcium hydroxide phase of the standard sample by taking the calcium hydroxide content in the standard sample as an abscissa and the measured integral intensity of the calcium hydroxide phase in the standard sample as an ordinate, and taking the working curve of the integral intensity of the calcium hydroxide phase of the standard sample as a calibration curve.

4. The method for determining the content of calcium hydroxide in a flue gas desulfurization agent according to claim 1, wherein the standard sample comprises a reference calcium carbonate and a reference calcium hydroxide in percentage by mass, and the standard sample is formed by starting from 0%, 5.0% and 10.0% of the calcium hydroxide content in percentage by mass and gradually increasing the calcium hydroxide content by 10.0% until the calcium hydroxide content reaches 100.0%.

5. The method for measuring the content of the calcium hydroxide in the flue gas desulfurization agent according to claim 1, wherein the method further comprises:

placing the reference calcium carbonate into a weighing dish, drying in an oven, taking out, placing in a dryer, and naturally cooling to room temperature;

placing the reference calcium hydroxide in a weighing dish, drying in an oven, taking out, and naturally cooling to room temperature in a dryer;

respectively preparing the dried reference calcium carbonate and the dried reference calcium hydroxide into standard samples with different calcium hydroxide contents according to mass percentage, and fully grinding and uniformly mixing the standard samples with an agate mortar;

respectively pressing the ground and uniformly mixed standard samples into tablets;

respectively measuring the integral intensity of the calcium hydroxide phase of the standard sample by using an X-ray diffractometer under the same diffraction condition as that of measuring the integral intensity of the calcium hydroxide in the sample to be measured of the flue gas desulfurization agent;

and drawing a working curve of the standard sample calcium hydroxide by taking the content of the standard sample calcium hydroxide as a horizontal coordinate and the measured phase integral intensity of the standard sample calcium hydroxide as a vertical coordinate to obtain a calibration curve.

6. The method for determining the content of the calcium hydroxide in the flue gas desulfurization agent according to claim 5, wherein the drying temperature of the reference calcium carbonate and the reference calcium hydroxide is 105 ℃ or higher, and the drying time is at least 1 hour.

7. The method for measuring the content of the calcium hydroxide in the flue gas desulfurization agent according to claim 5, wherein the particle size of the ground and uniformly mixed standard sample is less than 75 μm.

8. A method for measuring the content of calcium hydroxide in a flue gas desulfurizer is characterized by comprising the following steps:

grinding a sample to be detected in an agate mortar;

pressing the ground sample to be tested into tablets;

measuring the integral intensity of the calcium hydroxide phase of the sample to be measured on an X-ray diffractometer under the diffraction condition that the integral intensity of the calcium hydroxide phase is the same as that of a standard sample to be measured;

and according to the measured integral intensity of the calcium hydroxide phase of the sample to be detected, finding out the content of the calcium hydroxide corresponding to the integral intensity in a working curve of the integral intensity of the calcium hydroxide of the standard sample to obtain the content of the calcium hydroxide in the sample to be detected.

9. The method for determining the content of the calcium hydroxide in the flue gas desulfurization agent according to claim 8, wherein the ground particle size of the sample to be tested is less than 75 μm.

10. The method for determining the content of calcium hydroxide in a flue gas desulfurization agent according to claim 8, wherein at least 2 test samples to be determined are prepared from the same batch of test samples, the integral intensities of the calcium hydroxide phases of the 2 test samples are respectively determined, the content of calcium hydroxide corresponding to the integral intensity is found out from a working curve of the integral intensity of calcium hydroxide of a standard sample, and the arithmetic mean value calculation is performed to obtain the content of calcium hydroxide in the test sample.

Background

In the prior art, a flue gas desulfurization system for semi-dry desulfurization is adopted, and a calcium hydroxide flue gas desulfurizer is put into the desulfurization system to react with flue gas in a desulfurization tower to eliminate sulfur dioxide in the flue gas. In order to ensure the desulfurization effect, the content of calcium hydroxide in the desulfurizer is about 85 percent, and the actual result is that the content of active calcium cannot be lower than about 85 percent. Because the sulfur dioxide content in the flue gas is a fluctuation data, a part of calcium hydroxide does not participate in the reaction in the desulfurization reaction process, and is mixed with the reacted products of calcium sulfate and calcium sulfite to form desulfurization ash to be discharged out of the system, which causes waste. In the actual desulfurization process, when the content of calcium hydroxide in the mixture is too low, the desulfurization system is blocked, and in this case, on one hand, the mixture, i.e. the desulfurization ash, needs to be discharged out of the system, and on the other hand, calcium hydroxide needs to be supplemented into the system. In the industry, the calcium hydroxide point in the desulfurization ash (calcium sulfite, calcium sulfate and calcium hydroxide) generated after desulfurization reaction of the flue gas desulfurization agent is usually about 10-15% as a judgment basis, the calcium hydroxide point mainly refers to the content of calcium hydroxide in the desulfurization ash, and the lower limit value of the calcium hydroxide content lower than 10% is mainly determined according to the difficulty degree of controlling emission data of sulfur dioxide monitored by CEMS. Therefore, samples of the desulfurized fly ash must be taken at certain intervals to test and analyze the content of the calcium hydroxide in the desulfurized fly ash, when the detection result of the content of the calcium hydroxide in the samples is lower than 10 percent, the desulfurized fly ash in the system is discharged into a desulfurized fly ash bin through a control program, and then a certain amount of calcium hydroxide is added into the system.

Thus, the flue gas desulfurization system adopting the semidry method for desulfurization needs to detect the content of calcium hydroxide, and the chemical method for detecting the content of hydroxyl (OH) detected by adopting the sucrose method^-) The detection principle of the content of the calcium hydroxide is that sucrose reacts with calcium ions in calcium hydroxide to generate calcium sucrose with high solubility, the calcium sucrose is titrated by hydrochloric acid, and finally the content of the calcium hydroxide is obtained through calculation. If a certain amount of calcium oxide is contained in the calcium hydroxide sample, when the content of calcium hydroxide is determined by a sucrose method, the calcium oxide also participates in the reaction, the calcium oxide and the calcium hydroxide are simultaneously detected, the content of calcium oxide and the content of calcium hydroxide cannot be respectively distinguished, the calcium oxide and the calcium hydroxide are combined in the calculation process and calculated according to the molar mass of calcium hydroxide, the result of the content of calcium hydroxide is higher, and therefore the detection result is interfered. The calcium titration method is to detect calcium ions (Ca)⁺) The content of the components is as follows,the contents of calcium oxide and calcium hydroxide cannot be distinguished separately, resulting in inaccurate results. The fluorescence detection method is a method for detecting the calcium content, and has the same problems as the titration method.

Disclosure of Invention

The invention aims to provide a method for measuring the content of calcium hydroxide in a flue gas desulfurizer, which adopts an X-ray diffraction method, can distinguish calcium oxide or calcium hydroxide due to the fact that the diffraction patterns 2 theta angles of calcium oxide and calcium hydroxide are completely different, and can quickly and effectively solve the problem that the detection results of the measuring and calculating methods are inaccurate.

On one hand, the method for measuring the content of calcium hydroxide in the flue gas desulfurization agent comprises the following steps:

under the diffraction condition, measuring the integral intensity of a calcium hydroxide phase in a sample to be detected of the flue gas desulfurizer;

finding out the content of the calcium hydroxide in the calibration curve according to the measured integral intensity of the calcium hydroxide phase of the sample to be detected to obtain the content of the calcium hydroxide in the sample to be detected; and the calibration curve is obtained by drawing by measuring the integral intensity of the calcium hydroxide phase in the standard sample with different content of calcium hydroxide according to the same diffraction condition as that of the calcium hydroxide phase in the sample to be measured for measuring the flue gas desulfurization agent.

Preferably, at least 2 samples to be tested in the same batch are prepared for the samples to be tested, the integral intensity of the calcium hydroxide phase of the 2 samples to be tested is respectively measured, the content of the calcium hydroxide corresponding to the integral intensity is found out in the calibration curve, and the content of the calcium hydroxide in the samples to be tested is determined according to the content of the calcium hydroxide of the 2 samples to be tested.

Preferably, wherein the method further comprises: respectively measuring the integral intensity of the calcium hydroxide phase in the standard sample with different calcium hydroxide contents under the same diffraction condition as that of the calcium hydroxide in the sample to be measured of the flue gas desulfurization agent, drawing a working curve of the integral intensity of the calcium hydroxide phase of the standard sample by taking the calcium hydroxide content in the standard sample as an abscissa and the measured integral intensity of the calcium hydroxide phase in the standard sample as an ordinate, and taking the working curve of the integral intensity of the calcium hydroxide phase of the standard sample as a calibration curve.

Preferably, the standard sample comprises reference calcium carbonate and reference calcium hydroxide in percentage by mass, and the standard sample is formed by starting from 0%, 5.0% and 10.0% of calcium hydroxide in percentage by mass and gradually increasing by 10.0% of calcium hydroxide until the calcium hydroxide content reaches 100.0%.

Preferably, wherein the method further comprises:

placing the reference calcium carbonate into a weighing dish, drying in an oven, taking out, placing in a dryer, and naturally cooling to room temperature;

placing the reference calcium hydroxide in a weighing dish, drying in an oven, taking out, and naturally cooling to room temperature in a dryer;

respectively preparing the dried reference calcium carbonate and the dried reference calcium hydroxide into standard samples with different calcium hydroxide contents according to mass percentage, and fully grinding and uniformly mixing the standard samples with an agate mortar;

respectively pressing the ground and uniformly mixed standard samples into tablets;

respectively measuring the integral intensity of the calcium hydroxide phase of the standard sample by using an X-ray diffractometer under the same diffraction condition as that of measuring the integral intensity of the calcium hydroxide in the sample to be measured of the flue gas desulfurization agent;

and drawing a working curve of the standard sample calcium hydroxide by taking the content of the standard sample calcium hydroxide as a horizontal coordinate and the measured phase integral intensity of the standard sample calcium hydroxide as a vertical coordinate to obtain a calibration curve.

Preferably, the drying temperature of the reference calcium carbonate and the reference calcium hydroxide is greater than or equal to 105 ℃, and the drying time is at least 1 hour.

Preferably, the particle size of the ground and mixed standard sample is less than 75 μm.

In a second aspect, a method for determining the content of calcium hydroxide in a flue gas desulfurization agent comprises the following steps:

grinding a sample to be detected in an agate mortar;

pressing the ground sample to be tested into tablets;

measuring the integral intensity of the calcium hydroxide phase of the sample to be measured on an X-ray diffractometer under the diffraction condition that the integral intensity of the calcium hydroxide phase is the same as that of a standard sample to be measured;

and according to the measured integral intensity of the calcium hydroxide phase of the sample to be detected, finding out the content of the calcium hydroxide corresponding to the integral intensity in a working curve of the integral intensity of the calcium hydroxide of the standard sample to obtain the content of the calcium hydroxide in the sample to be detected.

Preferably, the particle size of the sample to be tested is less than 75 μm.

Preferably, the sample to be detected is at least 2 samples to be detected made in the same batch, the integral intensity of the calcium hydroxide phase of the 2 samples to be detected is respectively measured, the content of the calcium hydroxide corresponding to the integral intensity is found out from the working curve of the integral intensity of the standard sample calcium hydroxide, and the calculation is performed to obtain the content of the calcium hydroxide in the sample to be detected.

The method for measuring the content of the calcium hydroxide in the flue gas desulfurizer has the advantages of high detection speed and small error, effectively solves the problem of the detection accuracy of the content of the calcium hydroxide in the flue gas desulfurizer, provides a judgment basis for the quality and the efficient utilization of the flue gas desulfurizer, and can measure the content of the calcium hydroxide in the flue gas desulfurizer more accurately.

Drawings

FIG. 1 is a schematic flow chart of a method for determining the content of calcium hydroxide in a flue gas desulfurization agent according to an embodiment of the present invention;

FIG. 2 is a schematic flow chart of a method for plotting a calibration curve of a standard sample according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a working curve of integrated intensity of a standard sample for a method for determining calcium hydroxide content in a flue gas desulfurization agent according to an embodiment of the present invention;

FIG. 4 is a graph showing an integrated intensity spectrum of a standard sample having a calcium hydroxide content of 5.0% measured by an X-ray diffractometer according to an embodiment of the present invention;

FIG. 5 is a graph showing an integrated intensity spectrum of 85.0% calcium hydroxide content of a standard sample measured by an X-ray diffractometer according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments.

Any crystalline material has a particular crystalline structure (crystal type, unit cell size and particle type, number, distribution) and constituent elements. A substance has its own unique diffraction spectrum corresponding to it, and the diffraction spectrum of multiphase substance is the simple superposition of the diffraction spectra of each incoherent, independent phase. Therefore, the system in which plural phases coexist can be totally analyzed.

The diffraction pattern can distinguish calcium oxide or calcium hydroxide by completely different 2 theta angles, the 2 theta of the (001) crystal face of the calcium hydroxide is 18.05 degrees, and the diffraction intensity of the calcium hydroxide phase in the diffraction pattern is increased along with the increase of the content of the calcium hydroxide.

In the method for determining the content of calcium hydroxide in the flue gas desulfurization agent, an X-ray diffraction method is adopted, and the integral intensity of a calcium hydroxide phase in a sample to be tested of the flue gas desulfurization agent is determined under a diffraction condition; finding out the content of the calcium hydroxide in the calibration curve according to the measured integral intensity of the calcium hydroxide phase of the sample to be detected to obtain the content of the calcium hydroxide in the sample to be detected; and the calibration curve is obtained by drawing by measuring the integral intensity of the calcium hydroxide phase in the standard sample with different content of calcium hydroxide according to the same diffraction condition as that of the calcium hydroxide phase in the sample to be measured for measuring the flue gas desulfurization agent.

The method for measuring the content of calcium hydroxide in the flue gas desulfurizer is applied to the detection of incoming materials of the flue gas desulfurizer and the detection of a mixture generated by desulfurization reaction in the production process. Two application scenarios of the embodiment of the present invention are described below with reference to fig. 1 as an example.

Fig. 1 is a schematic flow chart of a method for determining the content of calcium hydroxide in a flue gas desulfurization agent according to an embodiment of the present invention. As shown in fig. 1, the method comprises steps S101-S109.

Example one

Step S101: sampling a sample to be tested:

respectively sampling 2 times in the flue gas desulfurizer incoming material to obtain a sample to be tested 1# and a sample to be tested 2 #.

Step S103: preparing a sample to be detected:

cleaning agate mortar with absolute ethyl alcohol cotton balls, and drying;

respectively grinding the sample to be tested 1# and the sample to be tested 2# in an agate mortar until the particle size is less than 10 mu m;

and (3) respectively pressing the ground sample to be tested 1# and the ground sample to be tested 2# into tablets.

Step S105: measuring integral intensity of a sample to be measured:

adjusting the X-ray diffractometer to reach a stable state required by measurement;

the integrated intensities of the calcium hydroxide phases of sample 1# and sample 2# were measured on an X-ray diffractometer under the same diffraction conditions as the integrated intensities of the calcium hydroxide phases of the standard sample, and the measured integrated intensity values were 1221.4 and 1220.6, respectively.

Step S107: checking a calibration curve:

according to the measured integrated intensity value of the sample to be tested, the content of calcium hydroxide in the calibration curve is respectively 85.8% and 85.6%.

Step S109: calculating the content of calcium hydroxide:

and the arithmetic mean value of the results of the two times of the sample No. 1 to be detected and the sample No. 2 to be detected is 85.7%, and one decimal point is taken to obtain that the content of the calcium hydroxide in the sample to be detected is 85.7%.

The embodiment is an embodiment of detecting the incoming materials of the flue gas desulfurization agent, and the application of detecting the mixture generated by desulfurization reaction in the production process is shown in the second embodiment.

Example two

Step S101: sampling a sample to be tested:

2 samples of the mixture generated by the desulfurization reaction are quickly extracted at the production site to be used as a sample 3# to be tested and a sample 4# to be tested.

Step S103: preparing a sample to be detected:

cleaning agate mortar with absolute ethyl alcohol cotton balls, and drying;

respectively grinding the sample to be tested 3# and the sample to be tested 4# in an agate mortar until the particle size is less than 10 mu m;

respectively pressing the ground sample to be tested 3# and the ground sample to be tested 4# into tablets;

step S105: measuring integral intensity of a sample to be measured:

adjusting the X-ray diffractometer to reach a stable state required by measurement;

the integrated intensities of the calcium hydroxide phases of sample 3# and sample 4# were measured on an X-ray diffractometer under the same diffraction conditions as the integrated intensities of the calcium hydroxide phases of the standard sample, and the measured integrated intensity values were 366.3 and 363.8, respectively.

Step S107: checking a calibration curve:

according to the measured integrated intensity value of the sample to be tested, the content of calcium hydroxide in the calibration curve is respectively 16.4% and 15.9%.

Step S109: calculating the content of calcium hydroxide:

and (3) sampling the arithmetic mean value of the results of the sample to be tested No. 3 and the sample to be tested No. 4 in the production field by 16.15%, and taking the decimal point one bit later to obtain the calcium hydroxide content in the sample to be tested of 16.2%.

The invention also relates to a method for drawing a calibration curve of a standard sample, which is described in the third embodiment.

EXAMPLE III

FIG. 2 is a schematic flow chart of a method for plotting a calibration curve of a standard sample according to an embodiment of the present invention; as shown in fig. 2, the method includes steps S301 to S307:

step S301: the reference material of the standard sample is taken, and the reference material of the embodiment is reference calcium carbonate and reference calcium hydroxide.

Step S302: standard sample reference material drying:

and respectively placing the reference calcium carbonate and the reference calcium hydroxide in weighing dishes, placing the weighing dishes in an oven to dry at 105 ℃ for about 1 hour, taking out the weighing dishes, placing the weighing dishes in a dryer, and naturally cooling to room temperature.

It should be noted that the drying temperature of 105 ℃ and the drying time of 1 hour are only set for the purpose of drying in this embodiment, and include, but are not limited to, the above set values.

Step S303: preparing standard sample reference materials:

cleaning an agate mortar by using an absolute ethyl alcohol cotton ball, and drying for later use;

the dried reference calcium carbonate and the dried reference calcium hydroxide are respectively prepared into a standard sample with the calcium hydroxide content of 0 percent, 5.0 percent and 10.0 percent according to the mass percentage, the amplitude of the calcium hydroxide content of 10.0 percent is gradually increased to 100.0 percent, and the standard sample is fully ground and uniformly mixed by an agate mortar until the granularity is less than 10 mu m.

Step S304: standard sample reference material preparation: and (4) respectively pressing the ground and uniformly mixed standard samples into tablets.

Step S305: standard sample measurement integrated intensity:

adjusting the X-ray diffractometer to reach a stable state required by measurement;

the integrated intensity of the calcium hydroxide phase of the standard sample with different calcium hydroxide content is respectively measured by an X-ray diffractometer, so as to respectively obtain the integrated intensity maps of the calcium hydroxide phase of the standard sample with different calcium hydroxide content, and in this embodiment, the integrated intensity map of the standard sample with 5.0% calcium hydroxide content and the integrated intensity map of the standard sample with 85.0% calcium hydroxide content are respectively measured, and the detailed maps are shown in fig. 4 and fig. 5.

FIG. 4 is a graph showing an integrated intensity spectrum of a standard sample having a calcium hydroxide content of 5.0% measured by an X-ray diffractometer according to an embodiment of the present invention.

FIG. 5 is a graph showing an integrated intensity spectrum of 85.0% calcium hydroxide content of a standard sample measured by an X-ray diffractometer according to an embodiment of the present invention.

In fig. 4 and 5, the X axis represents the diffraction angle 2 θ of the calcium hydroxide phase, and the Y axis represents the integrated intensity of the calcium hydroxide phase.

Description of the drawings: fig. 4 and 5 are only two kinds of integrated intensity maps of standard samples with different contents of calcium hydroxide measured by an X-ray diffractometer according to an embodiment of the invention.

In this example, 11 standard samples having different calcium hydroxide contents were used in total, and the integrated intensities of the respective calcium hydroxide phases were measured, as shown in table 1.

TABLE 1 Integrated intensity of calcium hydroxide phase of standard sample

In table 1: column 1 is the standard sample number, column 2 is the integrated intensity of each of the standard samples of different contents of calcium hydroxide measured, column 3 is the calcium hydroxide content, column 4 is the calculated content of calcium hydroxide, column 5 is the difference between column 3 and column 4, i.e. the error value.

Step S306: and (3) drawing a standard sample integral intensity working curve to obtain a calibration curve:

the content of the standard sample calcium hydroxide is used as the abscissa, the measured integral intensity of the standard sample calcium hydroxide phase is used as the ordinate, the working curve of the standard sample calcium hydroxide is drawn, and the working curve is used as the calibration curve, which is shown in fig. 3. In FIG. 3, the X-axis represents the content (%, by mass) of the calcium hydroxide phase of the standard sample, the Y-axis represents the integrated intensity of the calcium hydroxide phase of the standard sample, X-represents the measured value of the integrated intensity of the calcium hydroxide phase of the standard sample, □ -represents the calculated value of the integrated intensity of the calcium hydroxide phase of the standard sample, and X □ -represents the ineffective value.

Step S307: integrated intensity check of standard sample:

in order to verify the accuracy of the working curve of the standard sample calcium hydroxide, 11 standard samples with different contents of calcium hydroxide are prepared according to the second step and the third step to carry out integral intensity measurement, the working curve of the standard sample calcium hydroxide is checked according to the integral intensity, and the calibration curve is verified, and the result is shown in table 2.

TABLE 2 measurement results of the standard samples

Measurement results of standard sample

Serial number	Standard sample numbering	Integrated intensity	Standard sample value (%)	Found results (%)
					1	c5％	198.92	4.5	4.4
2	c10％	266.12	8.9	8.8
					3	c20％	414.06	17.8	17.5
4	c30％	543.52	26.7	26.5
					5	c40％	700.47	35.6	35.9
6	c50％	816.24	44.5	44.7
					7	c60％	934.14	53.4	53.3
8	c70％	987.24	62.3	59.8
					9	c80％	1119.23	71.2	71.3
10	c90％	1192.86	80.1	79.9
					11	c100％	1241.79	89.0	89.5

Description of the drawings: the "found results (%) in the above table are the content (%) of calcium hydroxide in the standard sample measured in correspondence with the integrated intensity of calcium hydroxide in the standard sample in the working curve.

It can be seen from the above table that errors between the calcium hydroxide content obtained by searching the standard sample calcium hydroxide working curve and the actual standard sample value are both less than 0.5, the average error is 0.486%, and the error value is small, so that the drawn standard sample calcium hydroxide working curve is verified to be accurate, and the working curve can be used as a calibration curve.

The method for measuring the content of the calcium hydroxide in the flue gas desulfurizer has the advantages of high detection speed and small error, effectively solves the problem of the detection accuracy of the content of the calcium hydroxide in the flue gas desulfurizer, provides a judgment basis for the quality and the efficient utilization of the flue gas desulfurizer, and can measure the content of the calcium hydroxide in the flue gas desulfurizer more accurately.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.