CN113639980A - 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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- 239000003546 flue gas Substances 0.000 title claims abstract description 348
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- 238000006477 desulfuration reaction Methods 0.000 description 14
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- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention provides a method and a device for evaluating water lifting performance of a flue gas water lifting device. The method comprises the following steps: detecting and acquiring the standard dry flue gas quantity at the outlet of the absorption tower; acquiring relative humidity of the flue gas at an inlet and an outlet of the flue gas water lifting device; calculating to obtain the theoretical water extraction amount of the flue gas; calculating to obtain an evaluation index of the water lifting performance of the flue gas water lifting device by detecting the actual water lifting amount collected by a water storage tank communicated with the outlet of the flue gas water lifting device; 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 performance of the flue gas water lifting device can be evaluated by combining the calculation of the theoretical water lifting amount and the actual water lifting amount, and the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
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 the water lifting performance of a flue gas water lifting device.
Background
The flue gas desulfurization of the coal-fired power plant can be divided into three types of wet desulfurization, semi-dry desulfurization and dry desulfurization, wherein the wet desulfurization is the flue gas desulfurization mode with the most application, the most mature technology and the highest efficiency in the current thermal power plant. However, wet desulphurization also has some problems, such as slurry foaming of the absorption tower, high water consumption, chimney corrosion, easy occurrence of 'white smoke', 'gypsum rain' and the like. Neicopeng flying and the like research the balance of desulfurization water by taking a certain 600MW unit as the background, and the result shows that the evaporation water amount in the absorption tower accounts for more than 90% of the water consumption of the system. The constituents of the oxide scale of the sample plate of the corrosion chimney are analyzed by energy spectrum analysis through the tension bush, and the like, and the sulfur content of the oxide scale is found to be 0.84 percent and is far higher than the initial sulfur content of the raw material by 0.01 percent, and the fume is inferred to contain corrosive gas. The Wangzhongwei et al think that the condensed water generated in the chimney is low-concentration dilute sulfuric acid solution, and the corrosive acid solution is stronger. The peripheral flood light and the like consider that the arrangement of the steam-water separator in the flue is a feasible method for eliminating 'white smoke' and 'gypsum rain'.
The main technology of flue gas water extraction 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 the desulfurization becomes saturated wet flue gas under the washing of slurry in the absorption tower and washing water of a demister after entering the absorption tower. During the period, the temperature of the flue gas is reduced from 95 ℃ to 130 ℃ to 45 ℃ to 60 ℃, and simultaneously a large amount of water is evaporated. The flue gas water extraction 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 supplement amount and maintain the desulfurization dynamic water balance.
However, the difference between the actual water lifting amount and the theoretical water lifting amount of the conventional flue gas water lifting device is large, and the main reason is that condensed mist drops cannot be completely collected, so that secondary discharge of the condensed mist 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 lifting amount under the test working condition cannot be determined.
Disclosure of Invention
Based on the defects in the prior art, the invention aims to provide a method for evaluating the water lifting performance of a flue gas water lifting device; the invention also aims to provide a device for evaluating the water lifting performance of the flue gas water lifting device; the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
The purpose of the invention is realized by the following technical scheme:
in one aspect, the invention provides a method for evaluating the water lifting performance of a flue gas water lifting device, which comprises the following steps:
detecting and acquiring the standard dry flue gas quantity at the outlet of the absorption tower;
acquiring relative humidity of the flue gas at an inlet and an outlet of the flue gas water lifting device;
calculating to obtain theoretical water extraction amount of the flue gas 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 method comprises the steps of detecting actual water lifting amount collected by a water storage tank communicated with an outlet of a flue gas water lifting device, and further calculating to obtain an evaluation index of the water lifting performance of the flue gas water lifting device, wherein 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 traditional flue gas water lifting device mainly focuses on the temperature of flue gas, and the condensation forms fog drops which are less focused, so that the deviation between the actual water lifting amount and the theoretical water lifting amount is larger, and the condensation fog drops are discharged for the second time. The expression is as follows: on one hand, the fog drops formed by condensation can not be completely collected by the demister, so that the actual water lifting amount is smaller; on the other hand, certain equipment chimney condensate water also enters the water storage tank, so that the actual water lifting amount is large; the actual water lifting amount is not exactly the same as the theoretical water lifting amount. However, in the conventional 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 the method for evaluating the water lifting performance of the flue gas water lifting device, the method realizes the evaluation of the performance of the flue gas water lifting device by combining the calculation of the theoretical water lifting amount and the actual water lifting amount, and the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
In the evaluation process of the invention, the standard dry flue gas amount entering the flue gas water extraction device is the standard dry flue gas amount obtained from the outlet of the absorption tower for desulfurization at the upstream of the flue gas water extraction device; after the flue gas enters the flue gas water lifting device, the temperature of the flue gas is reduced, water drops are separated out by condensation, collected through a tray at the bottom of the flue gas water lifting device, and enter a water storage tank. The actual water lifting amount obtained in the water storage tank is calculated and determined according to the volume change corresponding to the liquid level change of the water storage tank.
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 flue gas quantity at the outlet of the absorption tower and is m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
which represents the relative humidity of the flue gas at the outlet of the flue gas water lifting device in%.
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, W0Representing the actual water extraction amount, and the unit is t/h; w represents the theoretical water extraction 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 device
The following formula is satisfied:
where ρ isw1The density of the water vapor at the inlet of the flue gas water lifting device is expressed in kg/m3；ρ1The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m3；dAWhich represents the moisture content of the flue gas at the inlet of the flue gas water lifting device and has the unit of g/kg.
In the above method, preferably, the moisture content d of the flue gas at the inlet of the flue gas water-lifting deviceAThe following formula is satisfied:
wherein p isS1The partial pressure of saturated steam at the inlet of the flue gas water extraction device is expressed in MPa; p is a radical ofAWhich represents the flue gas pressure at the inlet of the flue gas water lifting device and has the unit of MPa. The flue gas moisture content represents the mass (grams) of water vapor mixed per kilogram of mass of dry air.
In the above method, preferably, the partial pressure p of the saturated steam at the inlet of the flue gas water extraction deviceS1The following formula is satisfied:
wherein, T1Indicating the thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device, in K.
In the above method, preferably, the relative humidity of the flue gas at the outlet of the flue gas water-lifting device
The following formula is satisfied:
where ρ isw2The density of the water vapor at the outlet of the flue gas water lifting device is expressed in kg/m3；ρ2The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m3；dCThe moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in g/kg.
In the above method, preferably, the moisture content d of the flue gas at the outlet of the flue gas water-lifting deviceCThe following formula is satisfied:
wherein p isS2The partial pressure of saturated steam at the outlet of the flue gas water extraction device is expressed in MPa; p is a radical ofCThe unit of the flue gas pressure at the outlet of the flue gas water lifting device is MPa.
In the above method, preferably, the partial pressure p of the saturated steam at the outlet of the flue gas water extraction deviceS2The following formula is satisfied:
wherein, T2Expressing the thermodynamic temperature of the flue gas at the outlet of the flue gas water-lifting deviceIs K.
In another aspect, the present invention further provides a device for evaluating water lifting performance of a flue gas water lifting 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 a water storage tank communicated with the outlet of the flue gas water lifting device;
the smoke theoretical water lifting amount calculation module is used for calculating and obtaining the smoke theoretical water lifting amount based on the standard dry smoke amount and the relative humidity of smoke at an inlet and an outlet of the smoke water lifting device;
the evaluation index calculation module of the water lifting performance of the flue gas water lifting device is used for further calculating and obtaining the evaluation index of the water lifting performance of the flue gas water lifting device according to the actual water lifting amount and the theoretical water lifting amount, and the larger the numerical value of the evaluation index is, the better the water lifting performance of the flue gas water lifting device is.
In the above device, preferably, the theoretical water extraction amount W of flue gas satisfies the following formula:
wherein Q represents the standard dry flue gas quantity at the outlet of the absorption tower and is m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
which represents the relative humidity of the flue gas at the outlet of the flue gas water lifting device in%.
In the above device, preferably, the evaluation index β of the water-lifting performance of the flue gas water-lifting device satisfies the following formula:
wherein, W0Representing the actual water extraction amount, and the unit is t/h; w represents the theoretical water extraction 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 device
The following formula is satisfied:
where ρ isw1The density of the water vapor at the inlet of the flue gas water lifting device is expressed in kg/m3；ρ1The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m3；dAWhich represents the moisture content of the flue gas at the inlet of the flue gas water lifting device and has the unit of g/kg.
In the above apparatus, preferably, the moisture content d of the flue gas at the inlet of the flue gas water-lifting deviceAThe following formula is satisfied:
wherein p isS1The partial pressure of saturated steam at the inlet of the flue gas water extraction device is expressed in MPa; p is a radical ofAWhich represents the flue gas pressure at the inlet of the flue gas water lifting device and has the unit of MPa.
In the above-mentioned device, preferably, the partial pressure p of saturated steam at the inlet of the flue gas water-lifting deviceS1The following formula is satisfied:
wherein, T1Indicating the thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device, in K.
In the above device, preferably, the flue gas at the outlet of the flue gas water lifting device is opposite to the flue gas at the outlet of the flue gas water lifting deviceHumidity
The following formula is satisfied:
where ρ isw2The density of the water vapor at the outlet of the flue gas water lifting device is expressed in kg/m3；ρ2The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m3；dCThe moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in g/kg.
In the above apparatus, preferably, the moisture content d of the flue gas at the outlet of the flue gas water-lifting deviceCThe following formula is satisfied:
wherein p isS2The partial pressure of saturated steam at the outlet of the flue gas water extraction device is expressed in MPa; p is a radical ofCThe unit of the flue gas pressure at the outlet of the flue gas water lifting device is MPa.
In the above device, preferably, the partial pressure p of saturated steam at the outlet of the flue gas water extraction deviceS2The following formula is satisfied:
wherein, T2The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed in K.
The invention has the beneficial effects that:
the method for evaluating the water lifting performance of the flue gas water lifting device realizes the evaluation of the performance of the flue gas water lifting device by combining the calculation of the theoretical water lifting amount and the actual water lifting amount, and the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
Drawings
Fig. 1 is a schematic flow chart of flue gas water extraction performed by a flue gas water extraction device on flue gas subjected to wet desulphurization in embodiment 2 of the invention.
Fig. 2 is a diagram illustrating a flue gas water-lifting process in embodiment 2 of the present invention.
FIG. 3 is a comparison graph of the on-site measured flue gas lift and theoretical water lift in example 2 of the present invention.
Fig. 4 is a block diagram of the apparatus for evaluating the water-lifting performance of the flue gas water-lifting apparatus according to the present invention.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1:
the embodiment provides a method for evaluating water lifting performance of a flue gas water lifting device, which comprises the following steps:
the method comprises the following steps: detecting and obtaining the standard dry flue gas quantity Q at the outlet of the absorption tower; obtaining the relative humidity of the flue gas at the inlet and the outlet of the flue gas water-lifting device
And
the specific process is as follows:
(1) respectively calculating partial pressure p of saturated vapor at the inlet of the flue gas water lifting deviceS1And partial pressure p of saturated vapor at the outlet of the flue gas water extraction deviceS2The calculation formula is as follows:
wherein, T1Indicating the thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device, in K.
Wherein, T2The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed in K.
(2) According to partial pressure p of saturated water vapourSRespectively calculating to obtain the moisture content d of the flue gas at the inlet of the flue gas water lifting deviceAAnd the moisture content d of the flue gas at the outlet of the flue gas water lifting deviceCThe calculation formula is as follows:
wherein p isS1The partial pressure of saturated steam at the inlet of the flue gas water extraction device is expressed in MPa; p is a radical ofAWhich represents the flue gas pressure at the inlet of the flue gas water lifting device and has the unit of MPa.
Wherein p isS2The partial pressure of saturated steam at the outlet of the flue gas water extraction device is expressed in MPa; p is a radical ofCThe unit of the flue gas pressure at the outlet of the flue gas water lifting device is MPa.
(3) According to the moisture content d of the flue gas at the inlet and the outlet of the flue gas water lifting deviceAAnd dCAnd calculating to obtain the relative humidity of the flue gas at the inlet and the outlet of the flue gas water lifting device
And
the calculation formula is as follows:
where ρ isw1The density of the water vapor at the inlet of the flue gas water lifting device is expressed in kg/m3；ρ1The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m3；dAWhich represents the moisture content of the flue gas at the inlet of the flue gas water lifting device and has the unit of g/kg.
Where ρ isw2The density of the water vapor at the outlet of the flue gas water lifting device is expressed in kg/m3；ρ2The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m3；dCThe moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in 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 device
And
calculating to obtain the theoretical water extraction amount W of the flue gas, wherein the calculation formula is as follows:
wherein Q represents the standard dry flue gas quantity at the outlet of the absorption tower and is m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
which represents the relative humidity of the flue gas at the inlet of the flue gas water-lifting device in%.
Step three: by detection and fume extractionActual water lifting amount W collected by water storage tank communicated with outlet of water device0And further calculating to obtain 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 numerical value of the evaluation index beta is, the better the water lifting performance of the flue gas water lifting device is.
Example 2:
this example provides a specific application of the evaluation method based on example 1. Adopt certain 660MW coal-fired unit flue gas water lift device, it arranges in the low reaches of desulfurization absorption tower, this flue gas water lift device's entrance is linked together with the exit of desulfurization absorption tower, the flue gas gets into behind the flue gas water lift device, saturated clean flue gas carries out strong gas-liquid contact through the turbulator layer and mixes the realization cooling with the cooling cycle water that sprays down, clean flue gas after the cooling continues to contact with the liquid drop that sprays the layer, most tiny liquid drop is caught and is fallen down with the spray liquid together, remaining tiny liquid drop is caught on the defroster layer on upper portion, the clean flue gas emission of few along with the condensation, behind the flue gas water lift device, low temperature circulating water and the flue gas comdenstion water that are heated lean on gravity to the header. Fig. 1 is a schematic flow chart of flue gas water extraction performed by the flue gas subjected to wet desulphurization in the embodiment through a flue gas water extraction device.
The flue gas state after wet desulphurization is a 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 extraction process line diagram of fig. 2. The blue curve is the moisture content of the saturated flue gas versus temperature. And the point A is an absorption tower outlet flue gas parameter reference point, and the point G is an environmental parameter reference point. The flue gas water lifting process mainly realizes an implementation path from a point A to a point G. Flue gas water lifting can be realized only by a direct condensation method discharge process line ACEG and a condensation reheating method discharge process line ACFG.
The evaluation calculation process for the flue gas water extraction evaluation by the evaluation method of example 1 is as follows:
flue gas water lift testThe method is carried out in six working conditions in summer. The control variables in the test were: unit load and circulating water flow. The working condition I is as follows: 100% load, circulating cooling water flow 7700m3H; working conditions are as follows: 50% load, circulating cooling water flow 7700m3H; working conditions are as follows: 100% load, circulating cooling water flow 0m3H; working conditions are as follows: 50% load, circulating cooling water flow 0m3H; working condition five: 100% load, recirculated cooling water flow 3850m3H; working condition six: 50% load, recirculated cooling water flow 3850m3H is used as the reference value. And the measuring points 1 and 2 respectively represent an inlet measuring point A and an outlet measuring point C of the flue gas water lifting device. (1) (2) and (3) represent the first, second and third repeat tests, respectively.
During the test, the smoke parameters at the measuring point positions are shown in table 1. And (4) carrying out statistics on the amount of the smoke water according to the change before and after the water level test of the water storage tank under the conditions of zero water supplement outside and no water in the system. The result of the flue gas water-lifting amount measured on site is shown in figure 3.
Table 1:
the humidity in table 1 can be directly detected by a meter or calculated by the calculation formula in example 1; the flue gas volume Q is read through the DCS dial plate.
The water recovery capacity of the flue gas water lifting device is determined by a method combining field actual test and theoretical calculation, and specific results are shown in FIG. 3. Wherein the theoretical water extraction is determined by combining the formula in example 1 and table 1, and the density of the water vapor at the inlet and outlet of the flue gas water extraction device is 0.8036kg/m3Standard flue gas density at the inlet and outlet of the flue gas water-lifting device determined according to the tested flue gas components is 1.3735kg/m3。
Under the condition that the flue gas water lifting device is opened, the actual flue gas water lifting capacities of a working condition I, a working condition II, a working condition five and a working condition six are respectively as follows: 121.24t/h, 81.42t/h, 93.15t/h and 70.43 t/h; the theoretical water-lifting capacity of the flue gas is respectively as follows: 165.73t/h, 108.94t/h, 133.28t/h and 88.12 t/h. The ratio of the actual amount of extracted flue gas to the theoretical amount of extracted flue gas (i.e., the evaluation index β) was 0.73, 0.75, 0.70, and 0.80.
Evaluation and analysis:
(1) comparing the working condition I with the working condition V, under the conditions that the unit load is stable and the coal quality is unchanged, the smoke stripping water amount is reduced by 23.2% when the circulating cooling water flow is halved, which is mainly because the recovered heat is reduced, the smoke temperature is reduced, and the recovered water amount is reduced. 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 flue gas water lifting quantity is reduced by 32.8 percent, mainly because the unit load is low, the flue gas quantity is less, and the recovered water quantity is reduced. The conclusion obtained by comparing the working condition six with the working condition two and comparing the working condition six with the working condition five is the same.
(2) During the test period, the ratio of the actual smoke stripping water amount to the theoretical smoke stripping water amount is 0.7-0.8. The difference between the two is caused because the condensed and separated fog drops in the saturated flue gas can not be completely captured.
In conclusion, the method for evaluating the water lifting performance of the flue gas water lifting device realizes the evaluation of the performance of the flue gas water lifting device by combining the calculation of the theoretical water lifting amount and the actual water lifting amount, and the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
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, which is described in the following embodiment. Because the principle of the device for evaluating the water lifting performance of the flue gas water lifting device is similar to the method for evaluating the water lifting performance of the flue gas water lifting device, the implementation of the device for evaluating the water lifting performance of the flue gas water lifting device can refer to the implementation of the method for evaluating the water lifting performance of the flue gas water lifting device, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Fig. 4 is a block diagram of a structure of an apparatus for evaluating water lifting performance of a flue gas water lifting apparatus according to an embodiment of the present invention, as shown in fig. 4, the apparatus may include: the structure is described as follows by a parameter acquisition module 401, a smoke theoretical water lifting amount calculation module 402 and a smoke water lifting device water lifting performance evaluation index calculation module 403:
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 lifting amount calculating module 402 is configured to calculate, obtain and calculate a smoke theoretical water lifting amount W, where the smoke theoretical water lifting amount W satisfies the following formula:
wherein Q represents the standard dry flue gas quantity at the outlet of the absorption tower and is m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
an evaluation index calculation module 403 for water lifting performance of the flue gas water lifting device, which is used for calculating the actual water lifting amount W0And calculating to obtain an evaluation index beta of the water lifting performance of the flue gas water lifting device according to the theoretical water lifting amount W, wherein the evaluation index beta meets the following formula:
the larger the numerical value of the evaluation index beta is, the better the water lifting performance of the flue gas water lifting device is.
From the above description, it can be seen that the embodiments of the present invention achieve the following technical effects: the performance of the flue gas water lifting device can be evaluated by combining the calculation of the theoretical water lifting amount and the actual water lifting amount, and the evaluation method can conveniently, quickly and effectively realize the evaluation of the water lifting performance of the flue gas water lifting device.
Although the present invention provides method steps as described in the examples or flowcharts, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or end product executes, it may execute sequentially or in parallel (e.g., parallel processors or multi-threaded environments, or even distributed data processing environments) according to the method shown in the embodiment or 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, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The units, devices, modules, etc. set forth in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the present invention, the functions of each module may be implemented in one or more software and/or hardware, or the modules implementing the same functions may be implemented by a combination of a plurality of sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
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 the embodiments, it is clear to those skilled in the art that the present invention can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present invention may be embodied 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, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a mobile terminal, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type 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.
While the present invention has been described with respect to the embodiments, those skilled in the art will appreciate that there are numerous variations and permutations of the present invention without departing from the spirit of the invention, and it is intended that the appended claims cover such variations and modifications as fall within the true spirit of the invention.
Claims (10)
1. A method for evaluating the water lifting performance of a flue gas water lifting device comprises the following steps:
detecting and acquiring the standard dry flue gas quantity at the outlet of the absorption tower;
acquiring relative humidity of the flue gas at an inlet and an outlet of the flue gas water lifting device;
calculating to obtain theoretical water extraction amount of the flue gas 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 method comprises the steps of detecting actual water lifting amount collected by a water storage tank communicated with an outlet of a flue gas water lifting device, and further calculating to obtain an evaluation index of the water lifting performance of the flue gas water lifting device, wherein the larger the numerical value of the evaluation index is, the better the water lifting performance of the flue gas water lifting device is.
2. The method of claim 1, wherein the flue gas theoretical water extraction W satisfies the following formula (1):
wherein Q represents at the outlet of the absorption columnStandard dry smoke gas quantity in m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
represents the relative humidity of the flue gas at the outlet of the flue gas water lifting device, and the unit is%;
preferably, the evaluation index β of the water lifting performance of the flue gas water lifting device satisfies the following formula (2):
wherein, W0Representing the actual water extraction amount, and the unit is t/h; w represents the theoretical water extraction of the flue gas.
3. The method of claim 1, wherein the flue gas relative humidity at the flue gas water-lift inlet
Satisfies the following formula (3):
where ρ isw1The density of the water vapor at the inlet of the flue gas water lifting device is expressed in kg/m3；ρ1The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m3；dARepresenting the moisture content of the flue gas at the inlet of the flue gas water lifting device, and the unit is g/kg;
preferably, the flue gas moisture content d at the inlet of the flue gas water lifting deviceASatisfies the following formula (4):
wherein p isS1The partial pressure of saturated steam at the inlet of the flue gas water extraction device is expressed in MPa; p is a radical ofAThe unit of the flue gas pressure at the inlet of the flue gas water lifting device is MPa;
preferably, the partial pressure p of the saturated steam at the inlet of the flue gas water-lifting deviceSSatisfies the following formula (5):
wherein, T1Indicating the thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device, in K.
4. The method of claim 1, wherein the relative humidity of the flue gas at the outlet of the flue gas water extraction device
Satisfies the following formula (6):
where ρ isw2The density of the water vapor at the outlet of the flue gas water lifting device is expressed in kg/m3；ρ2The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m3；dCThe moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in g/kg.
5. The method of claim 1 wherein the flue gas moisture content d at the outlet of the flue gas water liftCSatisfies the following formula (7):
wherein p isS2The partial pressure of saturated steam at the outlet of the flue gas water extraction device is expressed in MPa; p is a radical ofCThe unit of the flue gas pressure at the outlet of the flue gas water lifting device is MPa;
preferably, the partial pressure p of saturated steam at the outlet of the flue gas water-lifting deviceS2Satisfies the following formula (8):
wherein, T2The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed in K.
6. An apparatus for evaluating water lifting performance of a flue gas water lifting device, the apparatus 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 a water storage tank communicated with the outlet of the flue gas water lifting device;
the smoke theoretical water lifting amount calculation module is used for calculating and obtaining the smoke theoretical water lifting amount based on the standard dry smoke amount and the relative humidity of smoke at an inlet and an outlet of the smoke water lifting device;
the evaluation index calculation module of the water lifting performance of the flue gas water lifting device is used for further calculating and obtaining the evaluation index of the water lifting performance of the flue gas water lifting device according to the actual water lifting amount and the theoretical water lifting amount, and the larger the numerical value of the evaluation index is, the better the water lifting performance of the flue gas water lifting device is.
7. The apparatus of claim 6, wherein the flue gas theoretical water extraction W satisfies the following formula (9):
wherein Q representsThe standard dry flue gas quantity at the outlet of the absorption tower is m3/h；
Represents the relative humidity of the flue gas at the inlet of the flue gas water lifting device, and the unit is%;
represents the relative humidity of the flue gas at the outlet of the flue gas water lifting device, and the unit is%;
preferably, the evaluation index β of the water lifting performance of the flue gas water lifting device satisfies the following formula (10):
wherein, W0Representing the actual water extraction amount, and the unit is t/h; w represents the theoretical water extraction of the flue gas.
8. The apparatus of claim 6, wherein the relative humidity of the flue gas at the inlet of the flue gas water lift
Satisfies the following formula (11):
where ρ isw1The density of the water vapor at the inlet of the flue gas water lifting device is expressed in kg/m3；ρ1The density of dry flue gas at the inlet of the flue gas water lifting device is expressed in kg/m3；dARepresenting the moisture content of the flue gas at the inlet of the flue gas water lifting device, and the unit is g/kg;
preferably, the flue gas moisture content d at the inlet of the flue gas water lifting deviceASatisfies the following formula (12):
wherein p isS1The partial pressure of saturated steam at the inlet of the flue gas water extraction device is expressed in MPa; p is a radical ofAThe unit of the flue gas pressure at the inlet of the flue gas water lifting device is MPa;
preferably, the partial pressure p of the saturated steam at the inlet of the flue gas water-lifting deviceSSatisfies the following formula (13):
wherein, T1Indicating the thermodynamic temperature of the flue gas at the inlet of the flue gas water lifting device, in K.
9. The apparatus of claim 6 wherein the relative humidity of the flue gas at the outlet of the flue gas water lift
Satisfies the following formula (14):
where ρ isw2The density of the water vapor at the outlet of the flue gas water lifting device is expressed in kg/m3；ρ2The density of dry flue gas at the outlet of the flue gas water lifting device is expressed in kg/m3；dCThe moisture content of the flue gas at the outlet of the flue gas water lifting device is expressed in g/kg.
10. The apparatus of claim 9 wherein the flue gas moisture content d at the flue gas water lift outletCSatisfies the following formula (15):
wherein p isS2The partial pressure of saturated steam at the outlet of the flue gas water extraction device is expressed in MPa; p is a radical ofCThe unit of the flue gas pressure at the outlet of the flue gas water lifting device is MPa;
preferably, the partial pressure p of saturated steam at the outlet of the flue gas water-lifting deviceS2Satisfies the following formula (16):
wherein, T2The thermodynamic temperature of the flue gas at the outlet of the flue gas water lifting device is expressed in K.
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