Denitration reactor catalyst replacement judgment method and system
By calculating the catalyst activity value and prediction curve function, the life of the denitrition reactor catalyst is accurately judged, which solves the problem that the catalyst replacement time cannot be accurately judged in the prior art and reduces the application cost.
Patent Information
- Application Number
- CN202411109114.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-13
- Publication Date
- 2024-12-27
AI Technical Summary
The prior art cannot accurately determine the replacement time of the denitrification reactor catalyst, resulting in higher application costs.
By calculating the catalyst activity value, determining the prediction curve function based on the wear and dust accumulation degree, solving the catalyst prediction life, and determining whether the catalyst needs to be replaced.
Accurately guide catalyst replacement to avoid early replacement without reaching service life and reduce application costs.
Smart Images
Figure CN119207603A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of catalysts, and in particular to a method and system for determining catalyst replacement in a denitration reactor. Background Art
[0002] Selective catalytic reduction (SCR) flue gas denitrification technology is the main technical solution for deep denitrification of boilers in thermal power plants. Its basic principle is to use a reducing agent (such as ammonia, urea, etc.) to react with nitrogen oxides in flue gas under the action of a catalyst to generate harmless nitrogen and water. According to statistics, the amount of catalyst used in process applications has exceeded 1 million cubic meters so far, and the amount is huge. Under normal circumstances, the chemical life of the SCR catalyst is 2 to 3 years and the mechanical life is 8 years. However, due to factors such as wear, dust accumulation, poisoning, and activity attenuation, a large number of catalysts are forced to be replaced before the chemical life, resulting in high application costs.
[0003] At present, there are few studies on the prediction of SCR catalyst life, and most researchers are committed to establishing a deactivation mechanics model to predict its deactivation trend by studying its deactivation principle. This method plays a great role in gaining a deep understanding of the catalyst deactivation process at the micro level and the catalyst deactivation trend under a single factor deactivation state. However, due to the complex and changeable flue gas conditions during the service of the SCR catalyst, there is more than one factor that causes its deactivation. Therefore, it is impossible to grasp the catalyst deactivation trend from a macroscopic perspective by studying the deactivation mechanism alone. In order to improve the above-mentioned drawbacks, some scholars have also used neural networks and gray prediction to establish a combined model to predict the catalyst life from the perspective of data mining, but this requires a large amount of data support and the amount of ammonia sprayed at the denitrification inlet must remain unchanged, which is difficult to achieve during the actual operation of the power plant.
[0004] Therefore, there is an urgent need for a method and system for determining the replacement of a denitration reactor catalyst to effectively solve the above-mentioned problem. Summary of the invention
[0005] The purpose of the present invention is to solve the problem in the prior art that it is impossible to accurately determine the replacement time of the denitrification reactor catalyst, and to provide a denitrification reactor catalyst replacement determination method, system, electronic device and machine-readable storage medium.
[0006] In order to achieve the above object, the first aspect of the present invention provides a method for determining the replacement of a catalyst in a denitration reactor, the method comprising the following steps:
[0007] S1, calculate the catalyst of the denitrification reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ;
[0008] S2, determining a prediction curve function according to the degree of wear and / or dust accumulation of the denitration reactor catalyst, and based on the denitration reactor catalyst at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function;
[0009] S3, calculating the critical catalyst activity value of the denitration reactor catalyst, and substituting the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst;
[0010] S4, based on the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
[0011] Preferably, in step S1, the calculation formula of the catalyst activity value includes:
[0012]
[0013] Wherein, K is the catalyst activity value, m / h; A V is the surface velocity, m / h; A is the flue gas flow rate at the catalyst inlet, m 3 / h; V is the catalyst surface area, m 2 ;M R is the ammonia nitrogen molar ratio; η is the denitrification efficiency of the catalyst, %; C1 is the NO x Concentration, mg / m 3 ; C2 is the reactor outlet NO x Concentration, mg / m 3 ; is the molar mass of NO2, g / mol; is the molar mass of NH3, g / mol; is the ammonia escape concentration, mg / m 3 .
[0014] Preferably, the prediction curve function is determined according to the degree of wear and / or dust accumulation of the denitration reactor catalyst, specifically comprising:
[0015] When the volume of the worn and ash deposited part of the denitrification reactor catalyst does not exceed its total volume When , the prediction curve function is K = K0 × cos (at);
[0016] When the volume of the worn and dusty part of the catalyst in the denitrification reactor is When , the prediction curve function is K=at+K0;
[0017] When the volume of the worn and ash deposited part of the denitrification reactor catalyst exceeds its total volume When the prediction curve function is K = K0 × e -at ;
[0018] Wherein, K is the catalyst activity value, m / h; a is the coefficient.
[0019] Preferably, in step S4, the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced, including:
[0020] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitration reactor catalyst is greater than zero, it does not need to be replaced;
[0021] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitrification reactor catalyst is not greater than zero, it needs to be replaced.
[0022] Preferably, in step S2, obtaining the prediction curve function further comprises: when the number of activity test points of the denitration reactor catalyst exceeds the set number of points and the amplitude of the operating environment change is less than the set amplitude threshold, fitting a number of activity test points to determine the prediction curve function.
[0023] Preferably, the number of set points is three.
[0024] Preferably, according to the calculation formula of the catalyst activity value, the critical catalyst activity value of the denitration reactor catalyst is calculated based on the NOx concentration threshold and the ammonia slip concentration threshold at the reactor outlet with other parameters unchanged.
[0025] A second aspect of the present invention provides a denitration reactor catalyst replacement determination system, which is applied to the above-mentioned determination method. The denitration reactor catalyst replacement determination system comprises:
[0026] The catalyst activity value calculation module is used to calculate the catalyst activity value of the denitration reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ;
[0027] The prediction curve function determination module is used to determine the prediction curve function according to the wear and / or dust accumulation degree of the denitration reactor catalyst, and based on the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function;
[0028] A catalyst life prediction module, used to calculate the critical catalyst activity value of the denitration reactor catalyst, and substitute the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst;
[0029] The catalyst replacement confirmation module is used to determine the catalyst replacement life of the denitration reactor based on the predicted life of the catalyst at the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
[0030] The third aspect of the present invention provides an electronic device, comprising at least one processor, at least one memory and a communication interface; the processor, the memory and the communication interface communicate with each other; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the above-mentioned denitrification reactor catalyst replacement determination method.
[0031] A fourth aspect of the present invention provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable the machine-readable storage medium to execute the above-mentioned method for determining the replacement of the denitration reactor catalyst.
[0032] According to the above technical scheme, based on the denitrification reactor catalyst replacement determination method and system, by calculating the catalyst activity values of the denitrification reactor catalyst at the initial replacement time and the current time, and then determining the prediction curve function according to the wear and / or dust accumulation degree of the denitrification reactor catalyst, and solving the prediction curve function based on the catalyst activity values of the denitrification reactor catalyst at the initial replacement time and the current time, and then substituting the critical catalyst activity value into the solved prediction curve function to obtain the predicted life of the denitrification reactor catalyst, and thus the remaining service life of the denitrification reactor catalyst can be obtained based on the service life of the denitrification reactor catalyst at the current time, thereby avoiding the denitrification reactor catalyst being replaced before reaching its service life, resulting in increased application costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 is a flow chart of a method for determining replacement of a denitration reactor catalyst;
[0034] Figure 2 It is a catalyst activity prediction attenuation curve diagram drawn based on the prediction curve function in Example 1. DETAILED DESCRIPTION
[0035] The specific implementation of the embodiment of the present invention is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.
[0036] The first aspect of the present invention provides a method for determining the replacement of a denitration reactor catalyst. Figure 1 As shown, the method for determining the replacement of the catalyst in the denitration reactor comprises the following steps:
[0037] S1, calculate the catalyst of the denitrification reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ;
[0038] S2, determining a prediction curve function according to the degree of wear and / or dust accumulation of the denitration reactor catalyst, and based on the denitration reactor catalyst at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function;
[0039] S3, calculating the critical catalyst activity value of the denitration reactor catalyst, and substituting the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst;
[0040] S4, based on the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
[0041] According to the above technical scheme, based on the denitrification reactor catalyst replacement determination method, in actual application, the predicted life of the denitrification reactor catalyst can be quickly obtained, so that the remaining service life of the denitrification reactor catalyst can be obtained based on the service life of the denitrification reactor catalyst at the current moment, thereby avoiding the denitrification reactor catalyst being replaced before reaching its service life, resulting in increased application costs.
[0042] In the method for determining catalyst replacement in a denitration reactor of the present invention, preferably, in step S1, the calculation formula for the catalyst activity value includes:
[0043]
[0044] Wherein, K is the catalyst activity value, m / h; A V is the surface velocity, m / h; A is the flue gas flow rate at the catalyst inlet, m 3 / h; V is the catalyst surface area, m 2 ;M R is the ammonia nitrogen molar ratio; η is the denitrification efficiency of the catalyst, %; C1 is the NO x Concentration, mg / m 3 ; C2 is the reactor outlet NO xConcentration, mg / m 3 ; is the molar mass of NO2, g / mol; is the molar mass of NH3, g / mol; is the ammonia escape concentration, mg / m 3 .
[0045] The activity of the denitrification reactor catalyst is a parameter that characterizes the catalytic ability of the catalyst in the denitrification reaction process, and is closely related to the properties of the catalyst itself, the flue gas conditions, and the unit status. Therefore, by using the calculation formula for the catalyst activity value of the present invention to accurately obtain the activity value of the denitrification reactor catalyst, it can further provide the necessary conditions for subsequently obtaining the predicted life of the denitrification reactor catalyst.
[0046] In the method for determining replacement of a denitration reactor catalyst of the present invention, preferably, in step S2, determining a prediction curve function according to the degree of wear and / or dust accumulation of the denitration reactor catalyst specifically includes:
[0047] When the volume of the worn and ash deposited part of the denitrification reactor catalyst does not exceed its total volume When , the prediction curve function is K = K0 × cos (at);
[0048] When the volume of the worn and dusty part of the catalyst in the denitrification reactor is When , the prediction curve function is K=at+K0;
[0049] When the volume of the worn and ash deposited part of the denitrification reactor catalyst exceeds its total volume When the prediction curve function is K = K0 × e -at ;
[0050] Wherein, K is the catalyst activity value, m / h; a is the coefficient.
[0051] By further determining different prediction curve functions based on the ratio of the volume of the wear and dust accumulation part of the denitration reactor catalyst to its total volume, the prediction accuracy of the service life of the denitration reactor catalyst can be effectively improved in practical application.
[0052] In another preferred embodiment, in step S2, obtaining the prediction curve function further includes: when the number of activity test points of the denitration reactor catalyst exceeds the set number of points and the amplitude of the operating environment change is less than the set amplitude threshold, fitting a number of activity test points to determine the prediction curve function. That is, when the operating environment of the denitration reactor is relatively stable and there is no sudden increase in wear and / or dust accumulation exceeding the set amplitude threshold, if the number of activity test points of the denitration reactor catalyst exceeds three points, the prediction curve function that better fits the trend of catalyst activity can be directly fitted based on the trend of three or more activity test points. Among them, by making the number of activity test points not less than three points, the accuracy of the fitted prediction curve function can be improved.
[0053] In the method for determining replacement of the catalyst in the denitration reactor of the present invention, preferably, in step S4, the predicted life of the catalyst in the denitration reactor is compared with the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced, including:
[0054] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitration reactor catalyst is greater than zero, it does not need to be replaced;
[0055] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitrification reactor catalyst is not greater than zero, it needs to be replaced.
[0056] In the method for determining the replacement of the catalyst in the denitration reactor of the present invention, preferably, according to the calculation formula of the catalyst activity value, the critical catalyst activity value of the catalyst in the denitration reactor is calculated based on the NOx concentration threshold and the ammonia slip concentration threshold at the reactor outlet when other parameters remain unchanged. Specifically, keeping other parameters unchanged, the NOx concentration threshold at the reactor outlet is specifically adjusted to 50 mg / Nm according to actual application needs. 3 The ammonia escape concentration threshold is 2.5 mg / Nm 3 By substituting the catalyst activity value in the calculation formula of step S1, the corresponding critical catalyst activity value can be obtained, and then the predicted life of the denitrification reactor catalyst can be obtained by further substituting the critical catalyst activity value into the determined prediction curve function, and then according to the usage time of the denitrification reactor catalyst at the current moment, the remaining service life of the denitrification reactor catalyst can be obtained, thereby accurately guiding the replacement of the denitrification reactor catalyst and avoiding premature replacement, which leads to increased application costs.
[0057] A second aspect of the present invention provides a denitration reactor catalyst replacement determination system, which is applied to the above-mentioned determination method, and the determination system comprises:
[0058] The catalyst activity value calculation module is used to calculate the catalyst activity value of the denitration reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ;
[0059] The prediction curve function determination module is used to determine the prediction curve function according to the wear and / or dust accumulation degree of the denitration reactor catalyst, and based on the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function;
[0060] A catalyst life prediction module, used to calculate the critical catalyst activity value of the denitration reactor catalyst, and substitute the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst;
[0061] The catalyst replacement confirmation module is used to determine the catalyst replacement life of the denitration reactor based on the predicted life of the catalyst at the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
[0062] According to the above technical scheme, based on the deNOx reactor catalyst replacement determination system, in actual application, the predicted life of the deNOx reactor catalyst can be quickly obtained, so that the remaining service life of the deNOx reactor catalyst can be obtained based on the service life of the deNOx reactor catalyst at the current moment, thereby avoiding the deNOx reactor catalyst being replaced before reaching its service life, resulting in increased application costs.
[0063] The third aspect of the present invention provides an electronic device, comprising at least one processor, at least one memory and a communication interface; the processor, the memory and the communication interface communicate with each other; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the above-mentioned denitrification reactor catalyst replacement determination method.
[0064] A fourth aspect of the present invention provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable the machine-readable storage medium to execute the above-mentioned method for determining the replacement of the denitration reactor catalyst.
[0065] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.
[0066] Example 1
[0067] Use Figure 1 The method for determining the replacement of the catalyst in the denitration reactor is implemented as shown. Specifically, the method for determining the replacement of the catalyst in the denitration reactor comprises the following steps:
[0068] S1, calculate the catalyst of the denitrification reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ;
[0069] S2, determining a prediction curve function according to the degree of wear and / or dust accumulation of the denitration reactor catalyst, and based on the denitration reactor catalyst at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function;
[0070] S3, calculating the critical catalyst activity value of the denitration reactor catalyst, and substituting the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst;
[0071] S4, based on the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced;
[0072] In step S1, the calculation formula of the catalyst activity value includes:
[0073]
[0074] Wherein, K is the catalyst activity value, m / h; A V is the surface velocity, m / h; A is the flue gas flow rate at the catalyst inlet, m 3 / h; V is the catalyst surface area, m 2 ;M R is the ammonia nitrogen molar ratio (NH3 / NO x );η is the denitration efficiency of the catalyst, %;C1 is the NO at the reactor inlet x Concentration, mg / m 3 ; C2 is the reactor outlet NO x Concentration, mg / m 3 ; is the molar mass of NO2, g / mol; is the molar mass of NH3, g / mol; is the ammonia escape concentration, mg / m 3 ; C1 and C2 are the reactor inlet and outlet NO converted to standard state, dry basis, 6% O2x concentration; It is the ammonia escape concentration converted to standard conditions, dry basis, and 6% O2.
[0075] In step S2, the prediction curve function is determined according to the degree of wear and / or dust accumulation of the catalyst in the denitration reactor, specifically including:
[0076] When the volume of the worn and ash deposited part of the denitrification reactor catalyst does not exceed its total volume When , the prediction curve function is K = K0 × cos (at);
[0077] When the volume of the worn and dusty part of the catalyst in the denitrification reactor is When , the prediction curve function is K=at+K0;
[0078] When the volume of the worn and ash deposited part of the denitrification reactor catalyst exceeds its total volume When the prediction curve function is K = K0 × e -at ;
[0079] Wherein, K is the catalyst activity value, m / h; a is the coefficient;
[0080] In step S4, the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced, including:
[0081] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitration reactor catalyst is greater than zero, it does not need to be replaced;
[0082] When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitration reactor catalyst is not greater than zero, it needs to be replaced;
[0083] According to the calculation formula of the catalyst activity value, the critical catalyst activity value of the denitration reactor catalyst is calculated based on the NOx concentration threshold and the ammonia slip concentration threshold at the reactor outlet when other parameters remain unchanged.
[0084] Specifically, at the current time t1, the denitration reactor catalyst has been running for 21502 hours, and the current reactor inlet and outlet NO x The concentrations were 31.9 mg / Nm 3 and 350mg / Nm 3 , ammonia escape is 2.6mg / Nm 3, the surface velocity is 10.1m / h, and the initial activity of the catalyst after the last catalyst replacement is 43.2m / h, i.e., K0; in practical application, firstly, the catalyst activity values K0 and K1 of the catalyst in the denitration reactor at the initial replacement time t0 and the current time t1 are calculated based on the calculation formula of the catalyst activity value; then, according to the wear and dust accumulation volume of the denitration reactor catalyst at time t1 not exceeding its total volume, The prediction curve function is determined to be K = K0 × cos(at), and then the catalyst activity values K0 and K1 of the denitrification reactor catalyst at the initial replacement time t0 and t1 are substituted into the prediction curve function K = K0 × cos(at) to obtain the coefficient a of the prediction curve function of 3.51804 × 10 -5 , thus obtaining the final prediction curve function K = 43.2 × cos (3.51804 × 10 -5 ×t); then keep other parameters in the calculation formula of catalyst activity unchanged and set the NOx concentration threshold at the reactor outlet to 50mg / Nm 3 and ammonia escape concentration threshold 2.5mg / Nm 3 Substituting into the calculation formula of the catalyst activity value, the critical catalyst activity value of the denitration reactor catalyst is 28.8 m / h, and then substituting 28.8 m / h into the final prediction curve function K = 43.2 × cos (3.51804 × 10 -5 ×t), the predicted life t of the denitration reactor catalyst is 23908h; finally, the difference between the predicted life of the denitration reactor catalyst and the service life of the denitration reactor catalyst at the current time t1 is 2406h, that is, under the current operating environment, the remaining service life of the denitration reactor catalyst is 2406h. The catalyst activity prediction attenuation curve diagram drawn based on the prediction curve function is shown in Figure 2 shown.
[0085] After testing, it was found that the method for determining the replacement of the denitrification reactor catalyst described in the present invention can accurately guide the replacement of the denitrification reactor catalyst in actual applications, thereby avoiding the denitrification reactor catalyst being replaced prematurely before reaching its service life, which leads to increased application costs.
[0086] Example 2
[0087] Refer to Example 1 for implementation, except that in step S2, the prediction curve function is obtained as follows: when the number of activity test points of the denitration reactor catalyst exceeds three points and the amplitude of the operating environment change is less than the set amplitude threshold, five activity test points are fitted to determine the prediction curve function.
[0088] After testing, it was found that the method for determining the replacement of the denitrification reactor catalyst described in the present invention can accurately guide the replacement of the denitrification reactor catalyst in actual applications, thereby avoiding the denitrification reactor catalyst being replaced prematurely before reaching its service life, which leads to increased application costs.
[0089] The denitrification reactor catalyst replacement determination method, system, electronic device and machine-readable storage medium provided by the present invention calculate the catalyst activity values of the denitrification reactor catalyst at the initial replacement time and the current time, then determine the prediction curve function according to the wear and / or dust accumulation degree of the denitrification reactor catalyst, and solve the prediction curve function based on the catalyst activity values of the denitrification reactor catalyst at the initial replacement time and the current time, and then substitute the critical catalyst activity value into the solved prediction curve function to obtain the predicted life of the denitrification reactor catalyst, so that the remaining service life of the denitrification reactor catalyst can be obtained based on the service life of the denitrification reactor catalyst at the current time, thereby avoiding the denitrification reactor catalyst being replaced before reaching its service life, resulting in increased application costs.
[0090] The preferred embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.
Claims
1. A method for determining catalyst replacement in a denitration reactor, characterized in that: The method for determining the replacement of the catalyst in the denitration reactor comprises the following steps: S1, calculate the catalyst of the denitrification reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ; S2, determining a prediction curve function according to the degree of wear and / or dust accumulation of the denitration reactor catalyst, and based on the denitration reactor catalyst at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function; S3, calculating the critical catalyst activity value of the denitration reactor catalyst, and substituting the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst; S4, based on the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
2. The method for determining the replacement of a denitration reactor catalyst according to claim 1, characterized in that: In step S1, the calculation formula of the catalyst activity value includes: Where K is the catalyst activity value, m / h; A V is the surface velocity, m / h; A is the flue gas flow rate at the catalyst inlet, m 3 / h; V is the catalyst surface area, m 2 ;M R is the ammonia nitrogen molar ratio; η is the denitrification efficiency of the catalyst, %; C1 is the NO x Concentration, mg / m 3 ; C2 is the reactor outlet NO x Concentration, mg / m 3 ;M NO2 is the molar mass of NO2, g / mol; M NH3 is the molar mass of NH3, g / mol; is the ammonia escape concentration, mg / m 3 .
3. The method for determining catalyst replacement in a denitration reactor according to claim 1, characterized in that: In step S2, the prediction curve function is determined according to the degree of wear and / or dust accumulation of the catalyst in the denitration reactor, specifically including: When the volume of the worn and ash deposited part of the denitrification reactor catalyst does not exceed its total volume When , the prediction curve function is K = K0 × cos (at); When the volume of the worn and dusty part of the catalyst in the denitrification reactor is When , the prediction curve function is K=at+K0; When the volume of the worn and ash deposited part of the denitrification reactor catalyst exceeds its total volume When the prediction curve function is K = K0 × e -at ; Wherein, K is the catalyst activity value, m / h; a is the coefficient.
4. The method for determining the replacement of a denitration reactor catalyst according to claim 1, characterized in that: In step S4, the predicted life of the denitration reactor catalyst and the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced, including: When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitration reactor catalyst is greater than zero, it does not need to be replaced; When the predicted life of the denitrification reactor catalyst is equal to the current time t i When the difference in the service life of the denitrification reactor catalyst is not greater than zero, it needs to be replaced.
5. The method for determining the replacement of a denitration reactor catalyst according to claim 1, characterized in that: In step S2, obtaining the prediction curve function also includes: when the number of activity test points of the denitration reactor catalyst exceeds the set number of points and the amplitude of the operating environment change is less than the set amplitude threshold, fitting a number of activity test points to determine the prediction curve function.
6. The method for determining the replacement of a denitration reactor catalyst according to claim 5, characterized in that: The number of set points is three.
7. The method for determining the replacement of a denitration reactor catalyst according to claim 2, characterized in that: According to the calculation formula of the catalyst activity value, the critical catalyst activity value of the denitration reactor catalyst is calculated based on the NOx concentration threshold and the ammonia slip concentration threshold at the reactor outlet when other parameters remain unchanged.
8. A denitration reactor catalyst replacement determination system, characterized in that: Applied to the determination method described in any one of claims 1 to 7 above, the denitration reactor catalyst replacement determination system comprises: The catalyst activity value calculation module is used to calculate the catalyst activity value of the denitration reactor at the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i ; The prediction curve function determination module is used to determine the prediction curve function according to the wear and / or dust accumulation degree of the denitration reactor catalyst, and based on the initial replacement time t0 and the current time t i The catalyst activity values K0 and K i Solving the determined prediction curve function; A catalyst life prediction module, used to calculate the critical catalyst activity value of the denitration reactor catalyst, and substitute the critical catalyst activity value into the prediction curve function to obtain the predicted life of the denitration reactor catalyst; The catalyst replacement confirmation module is used to determine the catalyst replacement life of the denitration reactor based on the predicted life of the catalyst at the current time t i The difference in the service life of the denitration reactor catalyst determines whether the denitration reactor catalyst needs to be replaced.
9. An electronic device, characterized in that: It includes at least one processor, at least one memory and a communication interface; the processor, the memory and the communication interface communicate with each other; the memory stores program instructions that can be executed by the processor, and the processor calls the program instructions to execute the denitrification reactor catalyst replacement determination method described in any one of claims 1-7.
10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, and the instructions are used to enable the machine-readable storage medium to execute the denitration reactor catalyst replacement determination method described in any one of claims 1-7.
Citation Information
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