CN113639980B - Method and device for evaluating water lifting performance of flue gas water lifting device - Google Patents
Method and device for evaluating water lifting performance of flue gas water lifting device Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 309
- 239000003546 flue gas Substances 0.000 title claims abstract description 307
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 299
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000003809 water extraction Methods 0.000 claims abstract description 69
- 239000000779 smoke Substances 0.000 claims abstract description 65
- 238000011156 evaluation Methods 0.000 claims abstract description 40
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- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims 1
- 238000006477 desulfuration reaction Methods 0.000 description 18
- 230000023556 desulfurization Effects 0.000 description 18
- 230000008569 process Effects 0.000 description 12
- 238000012360 testing method Methods 0.000 description 11
- 239000000498 cooling water Substances 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 238000009833 condensation Methods 0.000 description 4
- 230000005494 condensation Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 208000028659 discharge Diseases 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
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- 238000012854 evaluation process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
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- 239000002994 raw material Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
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- 230000001502 supplementing effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention provides a method and a device for evaluating water lifting performance of a smoke water lifting device. The method comprises the following steps: detecting and obtaining the standard dry smoke quantity at the outlet of the absorption tower; acquiring the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device; calculating to obtain the theoretical water extraction amount of the flue gas; the actual water extraction amount collected by a water storage tank communicated with the outlet of the smoke water extraction device is detected, and then the evaluation index of the water extraction performance of the smoke water extraction device is calculated and obtained; the larger the numerical value of the evaluation index is, the better the water lifting performance of the flue gas water lifting device is. The evaluation method can conveniently and effectively evaluate the water lifting performance of the smoke water lifting device by combining calculation of the theoretical water lifting amount with the actual water lifting amount.
Description
Technical Field
The invention belongs to the technical field of coal-fired power generation, and relates to a method and a device for evaluating water lifting performance of a flue gas water lifting device.
Background
Flue gas desulfurization in coal-fired power plants can be divided into three types, namely wet desulfurization, semi-dry desulfurization and dry desulfurization, wherein wet desulfurization is the flue gas desulfurization mode which is most applied, most mature in technology and highest in efficiency in the current thermal power plants. However, wet desulfurization has problems such as foaming of slurry in the absorption tower, high water consumption, corrosion of chimney, and easy occurrence of white smoke and gypsum rain. Nie Pengfei and the like study on desulfurization water balance by taking a certain 600MW unit as a background, and found that the evaporation water quantity in an absorption tower accounts for more than 90% of the water consumption of the system. Zhang Congsheng and the like, and the oxide skin components of the chimney template are corroded through energy spectrum analysis, so that the oxide skin sulfur content is found to be 0.84% which is far higher than the initial sulfur content of the raw materials, and the corrosive gas is deduced to be contained in the flue gas. Wang Zhongwei and the like consider that the condensed water generated in the chimney is low-concentration dilute sulfuric acid solution, and the corrosive acid solution is stronger than the high-concentration sulfuric acid solution. Zhou Hongguang et al consider that providing a steam-water separator in the flue is a viable method of eliminating "white smoke", "gypsum rain".
The main technology of the flue gas water lifting after desulfurization is that the flue gas state at the inlet of the absorption tower is unsaturated wet flue gas, and the flue gas state at the outlet of desulfurization is changed into saturated wet flue gas after entering the absorption tower under the washing of slurry and demister washing water of the absorption tower. During this period, the flue gas temperature is reduced from 95 ℃ to 130 ℃ to 45 ℃ to 60 ℃ while evaporating a large amount of water. The flue gas water lifting device extracts water in the flue gas through the cooling and dehumidifying process based on the thermodynamic property of saturated wet flue gas so as to reduce the desulfurization water supplementing amount and maintain the desulfurization dynamic water balance.
However, the difference between the actual water extraction amount and the theoretical water extraction amount of the traditional flue gas water extraction device is large, and the main reason is that the condensed fog drops cannot be completely trapped, so that secondary discharge of the condensed fog drops is caused. The performance of the traditional evaluation flue gas water lifting device is mainly judged by comparing the actual flue gas water lifting amount with the designed water lifting amount. However, the test working condition and the design working condition under the evaluation method are not completely the same, and the theoretical water extraction amount under the test working condition cannot be determined.
Disclosure of Invention
Based on the defects existing in the prior art, the invention aims to provide a method for evaluating the water lifting performance of a smoke water lifting device; the invention also aims at providing a device for evaluating the water lifting performance of the smoke water lifting device; the evaluation method can conveniently, quickly and effectively evaluate the water lifting performance of the smoke water lifting device.
The aim of the invention is achieved by the following technical scheme:
in one aspect, the invention provides a method for evaluating water lifting performance of a flue gas water lifting device, which comprises the following steps:
detecting and obtaining the standard dry smoke quantity at the outlet of the absorption tower;
acquiring the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device;
calculating and obtaining the theoretical water extraction amount of the flue gas based on the relative humidity of the flue gas at the inlet and the outlet of the standard dry flue gas amount and the flue gas at the inlet and the outlet of the flue gas water extraction device;
the actual water extraction amount collected by the water storage tank communicated with the outlet of the smoke water extraction device is detected, and then the evaluation index of the water extraction performance of the smoke water extraction device is calculated and obtained, wherein the larger the numerical value of the evaluation index is, the better the water extraction performance of the smoke water extraction device is indicated.
The traditional flue gas water lifting device mainly focuses on flue gas temperature, and mist drops formed by condensation focus less, so that the deviation of actual water lifting amount and theoretical water lifting amount is larger, and secondary discharge of the condensed mist drops is caused. The expression is as follows: on one hand, fog drops formed by condensation cannot be completely trapped by a demister, so that the actual water lifting amount is small; on the other hand, some equipment chimney condensed water also enters the water storage tank, so that the actual water lifting amount is larger; so the actual water extraction is not identical to the theoretical water extraction. The performance of the traditional evaluation flue gas water lifting device is mainly judged by comparing the actual flue gas water lifting amount with the designed water lifting amount, however, under the evaluation method, the test working condition and the design working condition are not completely the same, and the theoretical water lifting amount under the test working condition cannot be determined. Based on the above, the inventor innovatively provides an evaluation method for the water lifting performance of the flue gas water lifting device, and the evaluation method can conveniently, rapidly and effectively evaluate the water lifting performance of the flue gas water lifting device by combining calculation of theoretical water lifting amount with actual water lifting amount.
In the evaluation process of the invention, the standard dry flue gas quantity entering the flue gas water lifting device is the standard dry flue gas quantity obtained from the outlet of the absorption tower for desulfurization at the upstream of the flue gas water lifting device; after the flue gas enters the flue gas water lifting device, the temperature of the flue gas is reduced, water drops are condensed and separated out, and the flue gas is collected through a tray at the bottom of the flue gas water lifting device and enters the water storage tank. The actual water extraction amount obtained in the water storage tank is calculated and determined by the volume change corresponding to the water storage tank liquid level change.
In the above method, preferably, the theoretical water extraction amount W of the flue gas satisfies the following formula:
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the outlet of the flue gas water lifting device is expressed in percent.
In the above method, preferably, the evaluation index β of the water lifting performance of the flue gas water lifting device satisfies the following formula:
wherein W is 0 The actual water extraction amount is expressed, and the unit is t/h; w represents the theoretical water extraction amount of the flue gas.
In the above method, preferably, the relative humidity of the flue gas at the inlet of the flue gas water lifting deviceThe following formula is satisfied:
wherein ρ is w1 Represents the density of water vapor at the inlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 1 The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m 3 ；d A The moisture content of the flue gas at the inlet of the flue gas water lifting device is expressed in g/kg.
In the above method, preferably, the flue gas moisture content d at the inlet of the flue gas water lifting device A The following formula is satisfied:
wherein p is S1 The partial pressure of saturated steam at the inlet of the flue gas water lifting device is expressed in MPa; p is p A The flue gas pressure at the inlet of the flue gas water lifting device is expressed in MPa. The moisture content of flue gas represents the mass (grams) of water vapor mixed in dry air per kilogram of mass.
In the above method, preferably, the partial pressure p of saturated steam at the inlet of the flue gas water lifting device S1 The following formula is satisfied:
wherein T is 1 The thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device is expressed as K.
In the above method, preferably, the relative humidity of the flue gas at the outlet of the flue gas water lifting deviceThe following formula is satisfied:
wherein ρ is w2 Represents the density of water vapor at the outlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 2 The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m 3 ；d C The unit of the moisture content of the flue gas at the outlet of the flue gas water lifting device is g/kg.
In the above method, preferably, the flue gas moisture content d at the outlet of the flue gas water lifting device C The following formula is satisfied:
wherein p is S2 The partial pressure of saturated steam at the outlet of the flue gas water lifting device is expressed in MPa; p is p C The flue gas pressure at the outlet of the flue gas water lifting device is expressed in MPa.
In the above method, preferably, the partial pressure p of saturated steam at the outlet of the flue gas water lifting device S2 The following formula is satisfied:
wherein T is 2 The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed as K.
In another aspect, the present invention also provides a device for evaluating water lifting performance of a flue gas water lifting device, the device comprising:
the parameter acquisition module is used for acquiring the standard dry flue gas quantity at the outlet of the absorption tower, the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device and the actual water lifting quantity collected by the water storage tank communicated with the outlet of the flue gas water lifting device;
the flue gas theoretical water extraction amount calculation module is used for calculating and obtaining the flue gas theoretical water extraction amount based on the standard dry flue gas amount and the relative humidity of the flue gas at the inlet and the outlet of the flue gas water extraction device;
the evaluation index calculation module is used for calculating and obtaining the evaluation index of the water lifting performance of the smoke water lifting device according to the actual water lifting amount and the theoretical water lifting amount, wherein the larger the numerical value of the evaluation index is, the better the water lifting performance of the smoke water lifting device is.
In the above device, preferably, the theoretical water extraction amount W of the flue gas satisfies the following formula:
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the outlet of the flue gas water lifting device is expressed in percent.
In the above apparatus, preferably, the evaluation index β of the water lifting performance of the flue gas water lifting device satisfies the following formula:
wherein W is 0 The actual water extraction amount is expressed, and the unit is t/h; w represents the theoretical water extraction amount of the flue gas.
In the above device, preferably, the relative humidity of the flue gas at the inlet of the flue gas water lifting deviceThe following formula is satisfied:
wherein ρ is w1 Represents the water at the inlet of the flue gas water lifting deviceDensity of vapor in kg/m 3 ；ρ 1 The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m 3 ；d A The moisture content of the flue gas at the inlet of the flue gas water lifting device is expressed in g/kg.
In the above device, preferably, the flue gas moisture content d at the inlet of the flue gas water lifting device A The following formula is satisfied:
wherein p is S1 The partial pressure of saturated steam at the inlet of the flue gas water lifting device is expressed in MPa; p is p A The flue gas pressure at the inlet of the flue gas water lifting device is expressed in MPa.
In the above device, preferably, the partial pressure p of saturated steam at the inlet of the flue gas water lifting device S1 The following formula is satisfied:
wherein T is 1 The thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device is expressed as K.
In the above device, preferably, the relative humidity of the flue gas at the outlet of the flue gas water lifting deviceThe following formula is satisfied:
wherein ρ is w2 Represents the density of water vapor at the outlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 2 The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m 3 ；d C The unit of the moisture content of the flue gas at the outlet of the flue gas water lifting device is g/kg.
In the above device, preferably, the flue gas moisture content d at the outlet of the flue gas water lifting device C The following formula is satisfied:
wherein p is S2 The partial pressure of saturated steam at the outlet of the flue gas water lifting device is expressed in MPa; p is p C The flue gas pressure at the outlet of the flue gas water lifting device is expressed in MPa.
In the above device, preferably, the partial pressure p of saturated steam at the outlet of the flue gas water lifting device S2 The following formula is satisfied:
wherein T is 2 The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed as K.
The invention has the beneficial effects that:
according to the method for evaluating the water lifting performance of the smoke water lifting device, the evaluation of the performance of the smoke water lifting device is realized by combining the calculation of the theoretical water lifting amount with the actual water lifting amount, and the evaluation of the water lifting performance of the smoke water lifting device can be conveniently, quickly and effectively realized.
Drawings
Fig. 1 is a schematic diagram of a flow of flue gas water extraction by a flue gas water extraction device for wet desulfurization flue gas according to embodiment 2 of the present invention.
FIG. 2 is a diagram of the flue gas water lifting process in example 2 of the present invention.
FIG. 3 is a graph showing the comparison of the actual and theoretical water extraction of flue gas in situ in example 2 of the present invention.
FIG. 4 is a block diagram of the device for evaluating the water lifting performance of the flue gas water lifting device.
Detailed Description
The technical solution of the present invention will be described in detail below for a clearer understanding of technical features, objects and advantageous effects of the present invention, but should not be construed as limiting the scope of the present invention.
Example 1:
the embodiment provides a method for evaluating water lifting performance of a smoke water lifting device, which comprises the following steps:
step one: detecting and obtaining the standard dry smoke quantity Q at the outlet of the absorption tower; acquiring the relative humidity of flue gas at the inlet and the outlet of a flue gas water lifting deviceAnd->The specific process is as follows:
(1) Respectively calculating partial pressure p of saturated steam at the inlet of the flue gas water lifting device S1 And partial pressure p of saturated steam at outlet of flue gas water lifting device S2 The calculation formula is as follows:
wherein T is 1 The thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device is expressed as K.
Wherein T is 2 The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed as K.
(2) According to partial pressure p of saturated water vapour S Respectively calculating and obtaining the moisture content d of the flue gas at the inlet of the flue gas water lifting device A And the moisture content d of the flue gas at the outlet of the flue gas water lifting device C The calculation formula is as follows:
wherein p is S1 The partial pressure of saturated steam at the inlet of the flue gas water lifting device is expressed in MPa; p is p A The flue gas pressure at the inlet of the flue gas water lifting device is expressed in MPa.
Wherein p is S2 The partial pressure of saturated steam at the outlet of the flue gas water lifting device is expressed in MPa; p is p C The flue gas pressure at the outlet of the flue gas water lifting device is expressed in MPa.
(3) According to the moisture content d of the flue gas at the inlet and the outlet of the flue gas water lifting device A And d C Calculating and obtaining the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting deviceAnd->The calculation formula is as follows:
wherein ρ is w1 Represents the density of water vapor at the inlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 1 The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m 3 ；d A The moisture content of the flue gas at the inlet of the flue gas water lifting device is expressed in g/kg.
Wherein ρ is w2 Represents the density of water vapor at the outlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 2 Represents the density of dry flue gas at the outlet of the flue gas water lifting device,in kg/m 3 ；d C The unit of the moisture content of the flue gas at the outlet of the flue gas water lifting device is g/kg.
Step two: according to the standard dry flue gas quantity Q at the outlet of the absorption tower and the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting deviceAnd->The theoretical water extraction W of the flue gas is calculated and obtained, and the calculation formula is as follows:
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in percent.
Step three: actual water extraction amount W collected by detecting water storage tank communicated with outlet of flue gas water extraction device 0 And further calculating and obtaining an evaluation index beta of the water lifting performance of the flue gas water lifting device, wherein the calculation formula is as follows:
the larger the value of the evaluation index beta is, the better the water lifting performance of the smoke water lifting device is.
Example 2:
this example provides a specific application of the evaluation method based on example 1. The flue gas water lifting device of the coal-fired unit with 660MW is arranged at the downstream of the desulfurization absorption tower, the inlet of the flue gas water lifting device is communicated with the outlet of the desulfurization absorption tower, after flue gas enters the flue gas water lifting device, saturated clean flue gas is subjected to strong gas-liquid contact and mixing with sprayed cooling circulating water to realize cooling through a turbulator layer, the cooled clean flue gas is continuously contacted with liquid drops of the spraying layer, most of fine liquid drops are caught and fall together with the spraying liquid, the rest of fine liquid drops are caught in a demister layer at the upper part, little part of the fine liquid drops are discharged along with condensed clean flue gas, and the heated low-temperature circulating water and flue gas condensate water automatically flow into a water collecting tank by gravity after the flue gas flows through the water lifting device. Fig. 1 is a schematic flow chart of flue gas water extraction by the flue gas water extraction device for wet desulfurization flue gas in the embodiment.
The flue gas state after wet desulfurization is the saturated wet flue gas state at 45-60 ℃. The moisture in the flue gas is extracted through the cooling and dehumidifying process, such as the flue gas water lifting process diagram in fig. 2. The blue curve is the relationship curve of the moisture content of saturated flue gas and the temperature. The point A is the reference point of the flue gas parameters at the outlet of the absorption tower, and the point G is the reference point of the environmental parameters. The flue gas water lifting process mainly realizes a realization path from the point A to the point G by a technical means. Only the direct condensation method discharge process line ACEG and the condensation reheating method discharge process line ACDFG can realize the flue gas water lifting.
The smoke water lifting evaluation calculation process by using the evaluation method of the example 1 is as follows:
the flue gas water lifting test is performed in six working conditions in summer. The control variables in the test are: unit load and circulating water flow. Working condition one: 100% load, circulating cooling water flow 7700m 3 /h; working condition II: 50% load, circulating cooling water flow 7700m 3 /h; and (3) working condition III: 100% load, circulating cooling water flow 0m 3 /h; and (4) working condition four: 50% load, circulating cooling water flow 0m 3 /h; working condition five: 100% load, circulating cooling water flow 3850m 3 /h; working condition six: 50% load, circulating cooling water flow 3850m 3 And/h. The measuring point 1 and the measuring point 2 respectively represent an inlet measuring point A and an outlet measuring point C of the smoke water lifting device. (1) (2) and (3) represent first, second and third repetition tests, respectively.
During the test, the flue gas parameters at the measuring point positions are shown in table 1. And the water lifting amount of the flue gas is counted according to the change of the water storage tank before and after the water level test under the conditions of zero water supplement from the outside and useless water in the system. The result of on-site actual measurement of the smoke water extraction is shown in figure 3.
Table 1:
the humidity in table 1 can be directly detected by a meter or can be calculated by a calculation formula in example 1; the smoke quantity Q is read through a DCS dial.
The water recovery capacity of the flue gas water lifting device is determined by a method combining on-site actual testing and theoretical calculation, and the specific results are shown in fig. 3. Wherein the theoretical water extraction amount is determined by the formula in the table 1 and the formula in the example 1, and the density of the water vapor at the inlet and the outlet of the flue gas water extraction device is 0.8036kg/m 3 Standard dry smoke density 1.3735kg/m at inlet and outlet of smoke water lifting device determined according to tested smoke components 3 。
Under the condition that the smoke water lifting device is started, the actual smoke water lifting capacity of the first working condition, the second working condition, the fifth working condition and the sixth working condition is respectively as follows: 121.24t/h, 81.42t/h, 93.15t/h, 70.43t/h; the theoretical flue gas water extraction capacities are respectively as follows: 165.73t/h, 108.94t/h, 133.28t/h, 88.12t/h. The ratio of the actual smoke extraction amount to the theoretical smoke extraction amount (namely, the evaluation index beta) is 0.73, 0.75, 0.70 and 0.80.
Evaluation analysis:
(1) Compared with the first working condition and the fifth working condition, under the conditions that the load of the unit is stable and the coal quality is unchanged, the water extraction amount of the smoke is reduced by 23.2% when the flow rate of the circulating cooling water is halved, and the water extraction amount is mainly reduced due to the reduction of the recovered heat, the reduction of the temperature of the smoke and the reduction of the recovered water. Compared with the first working condition and the second working condition, under the condition that the coal quality is unchanged and the circulating water quantity is unchanged, the unit load is halved, the water extraction quantity of the smoke is reduced by 32.8%, and the smoke is mainly due to the low unit load, the low smoke quantity and the reduced water recovery quantity. And the conclusion obtained by comparing the working condition II with the working condition VI is the same as that obtained by comparing the working condition five with the working condition VI.
(2) During the test, the ratio of the actual smoke water extraction amount to the theoretical smoke water extraction amount is between 0.7 and 0.8. The difference between the two is caused by that fog drops condensed and separated out from saturated flue gas cannot be completely trapped.
In conclusion, the method for evaluating the water lifting performance of the smoke water lifting device realizes the evaluation of the performance of the smoke water lifting device by combining the calculation of the theoretical water lifting amount with the actual water lifting amount.
Based on the same inventive concept, the embodiment of the invention also provides a device for evaluating the water lifting performance of the flue gas water lifting device, as described in the following embodiment. Because the principle of the device for evaluating the water lifting performance of the smoke water lifting device for solving the problem is similar to that of the device for evaluating the water lifting performance of the smoke water lifting device, the implementation of the device for evaluating the water lifting performance of the smoke water lifting device can be referred to the implementation of the method for evaluating the water lifting performance of the smoke water lifting device, and repeated parts are omitted. As used below, the term "unit" or "module" may be a combination of software and/or hardware that implements the intended function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated. FIG. 4 is a block diagram of a device for evaluating water lifting performance of a flue gas water lifting device according to an embodiment of the present invention, as shown in FIG. 4, may include: the following describes the structure of the parameter acquisition module 401, the flue gas theoretical water lifting amount calculation module 402, and the evaluation index calculation module 403 for water lifting performance of the flue gas water lifting device:
the parameter acquisition module 401 is used for acquiring the standard dry flue gas amount at the outlet of the absorption tower, the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device and the actual water lifting amount collected by a water storage tank communicated with the outlet of the flue gas water lifting device;
the smoke theoretical water extraction amount calculation module 402 is configured to calculate, acquire and calculate a smoke theoretical water extraction amount W, where the smoke theoretical water extraction amount W satisfies the following formula:
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of;
the evaluation index calculation module 403 of the water lifting performance of the flue gas water lifting device is configured to calculate the actual water lifting amount W according to the actual water lifting amount W 0 And the theoretical water extraction quantity W is further calculated to obtain an evaluation index beta of the water extraction performance of the flue gas water extraction device, wherein the evaluation index beta meets the following formula:
the larger the value of the evaluation index beta is, the better the water lifting performance of the smoke water lifting device is.
From the above description, it can be seen that the following technical effects are achieved in the embodiments of the present invention: the evaluation method can conveniently and effectively evaluate the water lifting performance of the smoke water lifting device by combining calculation of the theoretical water lifting amount with the actual water lifting amount.
Although the invention provides method operational steps as described in the examples or flowcharts, more or fewer operational steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one way of performing the order of steps and does not represent a unique order of execution. When implemented in an actual device or end product, the instructions may be executed sequentially or in parallel (e.g., in a parallel processor or multi-threaded processing environment, or even in a distributed data processing environment) as illustrated by the embodiments or by the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, it is not excluded that additional identical or equivalent elements may be present in a process, method, article, or apparatus that comprises a described element.
The units, devices or modules etc. set forth in the above embodiments may be implemented in particular by a computer chip or entity or by a product having a certain function. For convenience of description, the above devices are described as being functionally divided into various modules, respectively. Of course, when implementing the present invention, the functions of each module may be implemented in the same or multiple pieces of software and/or hardware, or a module implementing the same function may be implemented by multiple sub-modules or a combination of sub-units. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller can be regarded as a hardware component, and means for implementing various functions included therein can also be regarded as a structure within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
From the above description of embodiments, it will be apparent to those skilled in the art that the present invention may be implemented in software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a mobile terminal, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present invention.
Various embodiments in this specification are described in a progressive manner, and identical or similar parts are all provided for each embodiment, each embodiment focusing on differences from other embodiments. The invention is operational with numerous general purpose or special purpose computer system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
Although the present invention has been described by way of examples, one of ordinary skill in the art appreciates that there are many variations and modifications that do not depart from the spirit of the invention, and it is intended that the appended claims encompass such variations and modifications as fall within the spirit of the invention.
Claims (6)
1. A method for evaluating water lifting performance of a flue gas water lifting device, comprising the following steps:
detecting and obtaining the standard dry smoke quantity at the outlet of the absorption tower;
acquiring the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device;
calculating and obtaining the theoretical water extraction amount of the flue gas based on the relative humidity of the flue gas at the inlet and the outlet of the standard dry flue gas amount and the flue gas at the inlet and the outlet of the flue gas water extraction device;
the actual water extraction amount collected by a water storage tank communicated with the outlet of the smoke water extraction device is detected, so that an evaluation index of the water extraction performance of the smoke water extraction device is obtained through calculation, and the larger the numerical value of the evaluation index is, the better the water extraction performance of the smoke water extraction device is indicated;
wherein the theoretical water extraction amount W of the flue gas satisfies the following formula (1):
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the outlet of the flue gas water lifting device is expressed in units of;
the evaluation index beta of the water lifting performance of the smoke water lifting device meets the following formula (2):
wherein W is 0 The actual water extraction amount is expressed, and the unit is t/h; w represents the theoretical water extraction amount of the flue gas;
relative humidity of flue gas at inlet of flue gas water lifting deviceSatisfies the following formula (3):
wherein ρ is w1 Represents the density of water vapor at the inlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 1 The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m 3 ；d A The moisture content of the flue gas at the inlet of the flue gas water lifting device is expressed in g/kg;
flue gas moisture content d at inlet of flue gas water lifting device A The following formula (4) is satisfied:
wherein p is S1 The partial pressure of saturated steam at the inlet of the flue gas water lifting device is expressed in MPa; p is p A The flue gas pressure at the inlet of the flue gas water lifting device is expressed in MPa;
relative humidity of flue gas at outlet of flue gas water lifting deviceThe following formula (6) is satisfied:
wherein ρ is w2 Indicating the outlet of the flue gas water lifting deviceDensity of water vapor in kg/m 3 ；ρ 2 The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m 3 ；d C The moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in g/kg;
flue gas moisture content d at outlet of flue gas water lifting device C The following formula (7) is satisfied:
wherein p is S2 The partial pressure of saturated steam at the outlet of the flue gas water lifting device is expressed in MPa; p is p C The flue gas pressure at the outlet of the flue gas water lifting device is expressed in MPa.
2. The method according to claim 1, wherein the partial pressure p of saturated steam at the inlet of the flue gas water lift S The following formula (5) is satisfied:
wherein T is 1 The thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device is expressed as K.
3. The method according to claim 1, wherein the partial pressure p of saturated steam at the outlet of the flue gas water lift S2 The following formula (8) is satisfied:
wherein T is 2 The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed as K.
4. A device for evaluating water lifting performance of a flue gas water lifting device, the device comprising:
the parameter acquisition module is used for acquiring the standard dry flue gas quantity at the outlet of the absorption tower, the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device and the actual water lifting quantity collected by the water storage tank communicated with the outlet of the flue gas water lifting device;
the flue gas theoretical water extraction amount calculation module is used for calculating and obtaining the flue gas theoretical water extraction amount based on the standard dry flue gas amount and the relative humidity of the flue gas at the inlet and the outlet of the flue gas water extraction device;
the evaluation index calculation module is used for calculating and obtaining an evaluation index of the water lifting performance of the smoke water lifting device according to the actual water lifting amount and the theoretical water lifting amount, wherein the larger the numerical value of the evaluation index is, the better the water lifting performance of the smoke water lifting device is;
wherein the theoretical water extraction amount W of the flue gas satisfies the following formula (9):
wherein Q represents the standard dry smoke quantity at the outlet of the absorption tower, and the unit is m 3 /h；The relative humidity of the flue gas at the inlet of the flue gas water lifting device is expressed in units of; />The relative humidity of the flue gas at the outlet of the flue gas water lifting device is expressed in units of;
the evaluation index beta of the water lifting performance of the smoke water lifting device meets the following formula (10):
wherein W is 0 The actual water extraction amount is expressed, and the unit is t/h; w represents the theoretical water extraction amount of the flue gas;
relative humidity of flue gas at inlet of flue gas water lifting deviceThe following formula (11) is satisfied:
wherein ρ is w1 Represents the density of water vapor at the inlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 1 The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m 3 ；d A The moisture content of the flue gas at the inlet of the flue gas water lifting device is expressed in g/kg;
flue gas moisture content d at inlet of flue gas water lifting device A The following formula (12) is satisfied:
wherein p is S1 The partial pressure of saturated steam at the inlet of the flue gas water lifting device is expressed in MPa; p is p A The flue gas pressure at the inlet of the flue gas water lifting device is expressed in MPa;
relative humidity of flue gas at outlet of flue gas water lifting deviceSatisfying the following formula (14):
wherein ρ is w2 Represents the density of water vapor at the outlet of the flue gas water lifting device, and the unit is kg/m 3 ；ρ 2 The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m 3 ；d C Representing the content of flue gas at the outlet of a flue gas water lifting deviceMoisture content in g/kg;
flue gas moisture content d at outlet of flue gas water lifting device C The following formula (15) is satisfied:
wherein p is S2 The partial pressure of saturated steam at the outlet of the flue gas water lifting device is expressed in MPa; p is p C The flue gas pressure at the outlet of the flue gas water lifting device is expressed in MPa.
5. The device according to claim 4, wherein the partial pressure p of saturated steam at the inlet of the flue gas water lift S Satisfies the following formula (13):
wherein T is 1 The thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device is expressed as K.
6. The device according to claim 4, wherein the partial pressure p of saturated steam at the outlet of the flue gas water lift S2 The following formula (16) is satisfied:
wherein T is 2 The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed as K.
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