Ammonia-nitrogen temperature integrated measurement method and system for denitration system

Abstract

The application discloses a kind of denitration system ammonia nitrogen temperature integration measurement methods, comprising: obtaining the NOx concentration of denitration system export;Obtain the ammonia injection amount of denitration system set and the ammonia escape amount of denitration system export, determine the ratio between the ammonia escape amount and the ammonia injection amount, according to the ratio determine ammonia escape abnormal grade;According to the ammonia escape abnormal grade, judge whether the NOx concentration is corrected;If the NOx concentration is corrected, the real-time flue gas temperature of branch pipe is obtained, and the operating mode is determined according to the real-time flue gas temperature, the operating mode includes correction mode and alarm mode;In correction mode, the NOx concentration is corrected according to the real-time flue gas temperature;In alarm mode, according to the real-time flue gas temperature, block pipe alarm and purge, and the NOx concentration is corrected after purging is completed.The running parameters in denitration system are detected truly.

Description

Technical Field

[0001] This invention relates to the field of denitrification system technology, and in particular to an integrated method and system for measuring ammonia nitrogen and temperature in a denitrification system. Background Technology

[0002] Flue gas denitrification refers to the process of reducing generated NOx to N2, thereby removing NOx from the flue gas. In the operation of a coal-fired boiler denitrification system, to improve denitrification efficiency within the framework of environmental protection and energy conservation, it is necessary to monitor NOx parameters in real time during the denitrification process. This allows for adjustments to the total amount and quantity of ammonia injected, ultimately avoiding over-injection or under-injection and meeting the unit's operational requirements.

[0003] However, during NOx parameter monitoring, when the flue gas temperature deviates from the catalyst's active range, the NOx value measured by existing technologies drops significantly, resulting in a low NOx value. This can be mistakenly interpreted as an improvement in denitrification efficiency, when in reality, the efficiency has not increased. Therefore, under special operating conditions, existing measurement technologies are unsuitable for operational and commissioning requirements. There is an urgent need for an integrated ammonia, nitrogen, and temperature measurement method for denitrification systems to accurately detect the operating parameters of the system. Summary of the Invention

[0004] The purpose of this invention is to provide an integrated method for measuring ammonia, nitrogen, and temperature in a denitrification system, which solves the problem that the measured NOx value does not match the actual value when the flue gas temperature is outside the catalyst's active range.

[0005] This invention provides an integrated method for measuring ammonia nitrogen and temperature in a denitrification system, comprising:

[0006] Obtain the NOx concentration at the outlet of the denitrification system;

[0007] The ammonia injection rate set in the denitrification system and the ammonia escape rate at the outlet of the denitrification system are obtained. The ratio between the ammonia escape rate and the ammonia injection rate is determined, and the abnormality level of ammonia escape is determined based on the ratio.

[0008] Determine whether to correct the NOx concentration based on the ammonia escape anomaly level;

[0009] If the NOx concentration is corrected, the real-time flue gas temperature of the branch pipe is obtained, and the operating mode is determined based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode.

[0010] In correction mode, the NOx concentration is corrected based on the real-time flue gas temperature;

[0011] In alarm mode, the system performs pipe blockage alarm and purging based on the real-time flue gas temperature, and corrects the NOx concentration after purging is completed.

[0012] In some embodiments of this application, a ratio matrix B0 is preset, and B0(B1, B2, B3, B4) is set, wherein B1 is a first preset ratio, B2 is a second preset ratio, B3 is a third preset ratio, B4 is a fourth preset ratio, and B1 < B2 < B3 < B4.

[0013] There is a preset ammonia escape anomaly level matrix L0, and L0(L1, L2, L3, L4) is set, where L1 is the first preset ammonia escape anomaly level, L2 is the second preset ammonia escape anomaly level, L3 is the third preset ammonia escape anomaly level, L4 is the fourth preset ammonia escape anomaly level, and L1 < L2 < L3 < L4.

[0014] Calculate the ratio b between the ammonia escape amount and the ammonia injection amount, and set the ammonia escape anomaly level according to the relationship between the ratio b and each preset ratio;

[0015] When b < B1, the first preset ammonia escape anomaly level L1 is set as the ammonia escape anomaly level;

[0016] When B1≤b<B2, the second preset ammonia escape anomaly level L2 is set as the ammonia escape anomaly level;

[0017] When B2≤b<B3, the third preset ammonia escape anomaly level L3 is set as the ammonia escape anomaly level;

[0018] When B3≤b<B4, the fourth preset ammonia escape anomaly level L4 is set as the ammonia escape anomaly level.

[0019] In some embodiments of this application, determining whether to correct the NOx concentration based on the ammonia escape anomaly level includes:

[0020] When the ammonia escape anomaly level is greater than the set anomaly level, the NOx concentration is corrected.

[0021] If the ammonia escape anomaly level is lower than the set anomaly level, the NOx concentration will not be corrected.

[0022] In some embodiments of this application, the branch pipe includes a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe, and a fifth branch pipe. The branch pipe is connected to the main pipe, the main pipe is connected to the primary hot air, the outlet of the main pipe is provided with a main pipe measuring pool, the inlet of the primary hot air is provided with a first valve, and the inlet of the main pipe measuring pool is provided with a second valve.

[0023] In some embodiments of this application, the branch pipe is equipped with a temperature sensor, which is used to detect the flue gas temperature of the branch pipe in real time.

[0024] The main pipe measuring tank is equipped with an ammonia sensor and a nitrogen oxide sensor. The ammonia sensor is used to detect the amount of ammonia escape at the outlet of the denitrification system.

[0025] The nitrogen oxide sensor is used to detect the NOx concentration at the outlet of the denitrification system.

[0026] In some embodiments of this application, determining the operating mode based on the real-time flue gas temperature includes:

[0027] If any of the real-time flue gas temperatures reaches the correction threshold, and any of the real-time flue gas temperatures is lower than the alarm threshold, then the operation mode is set to alarm mode.

[0028] If all temperature data in the real-time flue gas temperature do not reach the correction threshold, and all temperature data in the real-time flue gas temperature are higher than the alarm threshold, then the operation mode is set to correction mode.

[0029] In some embodiments of this application, the NOx concentration is corrected based on the real-time flue gas temperature, including:

[0030] The average flue gas temperature of the real-time flue gas temperature is determined, and the NOx concentration is corrected based on the average flue gas temperature.

[0031] A preset flue gas temperature matrix Y0 is defined as Y0(Y1, Y2, Y3, Y4), where Y1 is the first preset flue gas temperature, Y2 is the second preset flue gas temperature, Y3 is the third preset flue gas temperature, and Y4 is the fourth preset flue gas temperature, and Y1 < Y2 < Y3 < Y4.

[0032] A preset correction coefficient matrix h0 is defined as h0(h1, h2, h3, h4), where h1 is the first preset correction coefficient, h2 is the second preset correction coefficient, h3 is the third preset correction coefficient, and h4 is the fourth preset correction coefficient, and 1.2 < h1 < h2 < h3 < h4 < 5.0.

[0033] The real-time flue gas temperature of the branch pipe is obtained, the average flue gas temperature y of the real-time flue gas temperature is determined, and the NOx concentration C is corrected by selecting the corresponding correction coefficient according to the relationship between the average flue gas temperature y and each preset flue gas temperature.

[0034] When y < Y1, the fourth preset correction coefficient h4 is selected to correct the NOx concentration C, which is C*h4.

[0035] When Y1≤y<Y2, the NOx concentration C is corrected by the third preset correction coefficient h3, and the result is C*h3.

[0036] When Y2≤y<Y3, the second preset correction coefficient h2 is selected to correct the NOx concentration C, which is then C*h2;

[0037] When Y3≤y<Y4, the first preset correction coefficient h1 is selected to correct the NOx concentration C, which is then C*h1.

[0038] In some embodiments of this application, pipe blockage alarm and purging are performed based on the real-time flue gas temperature, including:

[0039] Determine the highest temperature of the real-time flue gas, set the purging time of the primary hot air according to the highest temperature, open the first valve, close the second valve, and control the primary hot air to enter the denitrification flue through the main pipe and branch pipe for purging.

[0040] This invention also discloses an integrated ammonia nitrogen and temperature measurement system for a denitrification system, comprising:

[0041] The acquisition module is used to acquire the NOx concentration and ammonia slip at the outlet of the denitrification system and to acquire the real-time flue gas temperature of the branch pipe.

[0042] The judgment module stores the ammonia injection rate set by the denitrification system. The judgment module is used to determine the ratio between the ammonia escape rate and the ammonia injection rate, determine the ammonia escape anomaly level based on the ratio, and determine whether to correct the NOx concentration based on the ammonia escape anomaly level.

[0043] The correction module is used to determine the operating mode based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode. In the correction mode, the NOx concentration is corrected based on the real-time flue gas temperature. In the alarm mode, the blockage alarm and purging are performed based on the real-time flue gas temperature. After the purging is completed, the NOx concentration is corrected.

[0044] In some embodiments of this application, the acquisition module includes:

[0045] A temperature sensor is installed on the branch pipe and is used to detect the flue gas temperature of the branch pipe in real time.

[0046] An ammonia sensor is installed in the main pipe measuring tank and is used to detect the amount of ammonia escape at the outlet of the denitrification system.

[0047] A nitrogen oxide sensor is installed in the main pipe measuring tank and is used to detect the NOx concentration at the outlet of the denitrification system.

[0048] The branch pipe includes a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe, and a fifth branch pipe. The branch pipe is connected to the main pipe, the main pipe is connected to the primary hot air, the main pipe measuring pool is located at the outlet of the main pipe, the primary hot air inlet is equipped with a first valve, and the inlet of the main pipe measuring pool is equipped with a second valve.

[0049] This invention discloses an integrated ammonia, nitrogen, and temperature measurement method for a denitrification system, comprising: acquiring the NOx concentration at the outlet of the denitrification system; acquiring the set ammonia injection rate and the ammonia escape rate at the outlet of the denitrification system, determining the ratio between the ammonia escape rate and the ammonia injection rate, and determining the ammonia escape anomaly level based on the ratio; determining whether to correct the NOx concentration based on the ammonia escape anomaly level; if the NOx concentration is to be corrected, acquiring the real-time flue gas temperature of the branch pipe, determining the operating mode based on the real-time flue gas temperature, the operating mode including a correction mode and an alarm mode; in the correction mode, correcting the NOx concentration based on the real-time flue gas temperature; in the alarm mode, performing pipe blockage alarm and purging based on the real-time flue gas temperature, and correcting the NOx concentration after purging.

[0050] This invention first determines whether a problem has occurred in the denitrification system by measuring ammonia slip, then determines whether NOx concentration correction is needed, and obtains the real-time flue gas temperature of the branch pipes, correcting the NOx concentration based on the real-time flue gas temperature. The method provided by this invention is effectively adapted to complex flue gas conditions, the sampling is practically significant, it broadens CEMS measurement data, and tends to provide reliable data when flue gas temperature changes significantly. The branch pipes and main pipes in this invention are located outside the flue, facilitating maintenance and replacement. Furthermore, regardless of the boiler's combustion state, it provides accurate data for denitrification, avoiding inaccurate data caused by operating conditions or the overall system, which could affect denitrification efficiency. Simultaneously, the total ammonia injection is controlled, saving resources and significantly improving denitrification quality.

[0051] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0052] Figure 1 This is a schematic flowchart of an integrated ammonia nitrogen and temperature measurement method for a denitrification system according to the present invention.

[0053] Figure 2 This is a schematic diagram of the installation of the branch pipe and the main pipe in an embodiment of the present invention;

[0054] Figure 3 This is a functional block diagram of an integrated ammonia nitrogen and temperature measurement system for a denitrification system according to the present invention.

[0055] Figure Labels

[0056] 1. Branch pipe; 11. First branch pipe; 12. Second branch pipe; 13. Third branch pipe; 14. Fourth branch pipe; 15. Fifth branch pipe; 2. Main pipe; 3. Main pipe measuring pool; 4. First valve; 5. Second valve. Detailed Implementation

[0057] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0058] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the ordinary meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0059] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof, without excluding other elements or objects. The terms "first," "second," and similar words used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "side," and "bottom," indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are merely relational terms determined for the convenience of describing the structural relationships of the various components or elements of the present invention, and do not specifically refer to any component or element in the invention, nor should they be construed as limiting the invention. Terms such as "fixed," "connected," and "linked," etc., should be interpreted broadly, indicating that it can be a fixed connection, an integral connection, or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For researchers or technicians in the field, the specific meaning of the above terms in this invention can be determined according to the specific circumstances, and they should not be construed as limitations on this invention.

[0060] Example

[0061] This invention provides an integrated method for measuring ammonia nitrogen and temperature in a denitrification system, such as... Figure 1 As shown, it includes:

[0062] Obtain the NOx concentration at the outlet of the denitrification system.

[0063] The ammonia injection rate set for the denitrification system and the ammonia escape rate at the denitrification system outlet are obtained. The ratio between the ammonia escape rate and the ammonia injection rate is determined, and the ammonia escape anomaly level is determined based on the ratio.

[0064] The NOx concentration should be adjusted based on the ammonia escape anomaly level.

[0065] If the NOx concentration is corrected, the real-time flue gas temperature of the branch pipe is obtained, and the operating mode is determined based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode.

[0066] In correction mode, the NOx concentration is corrected based on the real-time flue gas temperature.

[0067] In alarm mode, the system performs pipe blockage alarm and purging based on the real-time flue gas temperature, and corrects the NOx concentration after purging is completed.

[0068] In some embodiments of this application, a method for determining the ammonia escape anomaly level is disclosed, wherein a ratio matrix B0 is preset, and B0(B1, B2, B3, B4) is set, wherein B1 is a first preset ratio, B2 is a second preset ratio, B3 is a third preset ratio, B4 is a fourth preset ratio, and B1 < B2 < B3 < B4.

[0069] There is a preset ammonia escape anomaly level matrix L0, and L0(L1, L2, L3, L4) is set, where L1 is the first preset ammonia escape anomaly level, L2 is the second preset ammonia escape anomaly level, L3 is the third preset ammonia escape anomaly level, L4 is the fourth preset ammonia escape anomaly level, and L1 < L2 < L3 < L4.

[0070] Calculate the ratio b between the ammonia escape amount and the ammonia injection amount, and set the ammonia escape anomaly level according to the relationship between the ratio b and each preset ratio.

[0071] When b < B1, the first preset ammonia escape anomaly level L1 is set as the ammonia escape anomaly level.

[0072] When B1≤b<B2, the second preset ammonia escape anomaly level L2 is set as the ammonia escape anomaly level.

[0073] When B2≤b<B3, the third preset ammonia escape anomaly level L3 is set as the ammonia escape anomaly level.

[0074] When B3≤b<B4, the fourth preset ammonia escape anomaly level L4 is set as the ammonia escape anomaly level.

[0075] In this embodiment, during the denitrification reaction, the phenomenon of ammonia that does not participate in the reaction being discharged into the flue gas through the reactor is called ammonia slip. The greater the amount of ammonia slip, the higher the ammonia slip anomaly level. Therefore, the ammonia slip anomaly level is set according to the amount of ammonia slip.

[0076] In some embodiments of this application, determining whether to correct the NOx concentration based on the ammonia escape anomaly level includes:

[0077] When the ammonia escape anomaly level is greater than the set anomaly level, the NOx concentration is corrected.

[0078] If the ammonia escape anomaly level is lower than the set anomaly level, the NOx concentration will not be corrected.

[0079] In this embodiment, the higher the ammonia escape anomaly level, the less ammonia reacts with NOx, the greater the problem, and the more necessary it is to correct the NOx concentration.

[0080] In some embodiments of this application, the branch pipe 1 includes a first branch pipe 11, a second branch pipe 12, a third branch pipe 13, a fourth branch pipe 14, and a fifth branch pipe 15. The branch pipe 1 is connected to the main pipe 2, the main pipe 2 is connected to the primary hot air, the outlet of the main pipe 2 is provided with a main pipe measuring pool 3, the inlet of the primary hot air is provided with a first valve 4, and the inlet of the main pipe measuring pool 3 is provided with a second valve 5.

[0081] In this embodiment, when purging is not required, flue gas enters the main pipe from the branch pipe and then enters the main pipe measuring cell to detect NOx concentration and ammonia escape. When purging is required, primary hot air enters the branch pipe through the main pipe and then enters the denitrification flue to purge and prevent pipe blockage.

[0082] In some embodiments of this application, a method for measuring ammonia nitrogen temperature is disclosed, wherein a temperature sensor is installed on the branch pipe 1, and the temperature sensor is used to detect the flue gas temperature of the branch pipe in real time.

[0083] The main pipe measuring tank 3 is equipped with an ammonia sensor and a nitrogen oxide sensor. The ammonia sensor is used to detect the amount of ammonia escape at the outlet of the denitrification system.

[0084] The nitrogen oxide sensor is used to detect the NOx concentration at the outlet of the denitrification system.

[0085] In some embodiments of this application, determining the operating mode based on the real-time flue gas temperature includes:

[0086] If any of the real-time flue gas temperatures reaches the correction threshold, and any of the real-time flue gas temperatures is below the alarm threshold, then the operation mode is set to alarm mode.

[0087] If all temperature data in the real-time flue gas temperature do not reach the correction threshold, and all temperature data in the real-time flue gas temperature are higher than the alarm threshold, then the operation mode is set to correction mode.

[0088] In this embodiment, the correction threshold can be set to 250℃, and the alarm threshold can be set to 150℃. During the denitrification operation, if the real-time flue gas temperature of any branch pipe reaches the correction threshold (≥250℃), or is within the catalyst's active range, and the real-time flue gas temperature of other branch pipes is lower than the alarm threshold (≤150℃), it is determined to be a pipe blockage, and purging is initiated. When the real-time flue gas temperature of all branch pipes is between the correction threshold and the alarm threshold (≤250℃ and ≥150℃), it is determined to be in correction mode, and numerical correction for NOx is initiated.

[0089] In some embodiments of this application, a specific method for correcting the NOx concentration is disclosed, which involves correcting the NOx concentration based on the real-time flue gas temperature, including:

[0090] The average flue gas temperature of the real-time flue gas temperature is determined, and the NOx concentration is corrected based on the average flue gas temperature.

[0091] A preset flue gas temperature matrix Y0 is defined as Y0(Y1, Y2, Y3, Y4), where Y1 is the first preset flue gas temperature, Y2 is the second preset flue gas temperature, Y3 is the third preset flue gas temperature, and Y4 is the fourth preset flue gas temperature, and Y1 < Y2 < Y3 < Y4.

[0092] A preset correction coefficient matrix h0 is defined as h0(h1, h2, h3, h4), where h1 is the first preset correction coefficient, h2 is the second preset correction coefficient, h3 is the third preset correction coefficient, and h4 is the fourth preset correction coefficient, and 1.2 < h1 < h2 < h3 < h4 < 5.0.

[0093] The real-time flue gas temperature of the branch pipe is obtained, the average flue gas temperature y of the real-time flue gas temperature is determined, and the NOx concentration C is corrected by selecting the corresponding correction coefficient according to the relationship between the average flue gas temperature y and each preset flue gas temperature.

[0094] When y < Y1, the fourth preset correction coefficient h4 is selected to correct the NOx concentration C, which is then C*h4.

[0095] When Y1≤y<Y2, the NOx concentration C is corrected by the third preset correction coefficient h3, and the result is C*h3.

[0096] When Y2≤y<Y3, the second preset correction coefficient h2 is selected to correct the NOx concentration C, which is then C*h2.

[0097] When Y3≤y<Y4, the first preset correction coefficient h1 is selected to correct the NOx concentration C, which is then C*h1.

[0098] In this embodiment, the correction coefficient is obtained from experiments, and the correction coefficient is inversely proportional to the flue gas temperature.

[0099] In some embodiments of this application, a purging method is disclosed, which performs pipe blockage alarm and purging based on the real-time flue gas temperature, including:

[0100] Determine the highest temperature of the real-time flue gas, set the purging time of the primary hot air according to the highest temperature, open the first valve, close the second valve, and control the primary hot air to enter the denitrification flue through the main pipe and branch pipe for purging.

[0101] This invention also discloses an integrated ammonia nitrogen and temperature measurement system for a denitrification system, comprising:

[0102] The acquisition module is used to acquire the NOx concentration and ammonia slip at the outlet of the denitrification system and to acquire the real-time flue gas temperature of the branch pipe.

[0103] The judgment module stores the ammonia injection rate set by the denitrification system. The judgment module is used to determine the ratio between the ammonia escape rate and the ammonia injection rate, determine the ammonia escape anomaly level based on the ratio, and determine whether to correct the NOx concentration based on the ammonia escape anomaly level.

[0104] The correction module is used to determine the operating mode based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode. In the correction mode, the NOx concentration is corrected based on the real-time flue gas temperature. In the alarm mode, the blockage alarm and purging are performed based on the real-time flue gas temperature. After the purging is completed, the NOx concentration is corrected.

[0105] In some embodiments of this application, the acquisition module includes:

[0106] A temperature sensor is installed on the branch pipe 1 and is used to detect the flue gas temperature of the branch pipe in real time.

[0107] An ammonia sensor is installed in the main pipe measuring tank 3 and is used to detect the amount of ammonia escape at the outlet of the denitrification system.

[0108] A nitrogen oxide sensor is installed in the main pipe measuring tank 3, and the nitrogen oxide sensor is used to detect the NOx concentration at the outlet of the denitrification system.

[0109] The branch pipe 1 includes a first branch pipe 11, a second branch pipe 12, a third branch pipe 13, a fourth branch pipe 14, and a fifth branch pipe 15. The branch pipe 1 is connected to the main pipe 2, the main pipe 2 is connected to the primary hot air, the main pipe measuring pool 3 is located at the outlet of the main pipe 2, the primary hot air inlet is provided with a first valve 4, and the inlet of the main pipe measuring pool 3 is provided with a second valve 5.

[0110] In this embodiment, when purging is not required, flue gas enters the main pipe from the branch pipe and then enters the main pipe measuring cell to detect NOx concentration and ammonia escape. When purging is required, primary hot air enters the branch pipe through the main pipe and then enters the denitrification flue to purge and prevent pipe blockage.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

[0112] The system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.

[0113] Those skilled in the art will recognize that the modules and method steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. The programs corresponding to the software modules and method steps can be placed in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium known in the art. To clearly illustrate the interchangeability of electronic hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in electronic hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the invention.

Claims

1. A method for integrated measurement of ammonia nitrogen and temperature in a denitrification system, characterized in that, include: Obtain the NOx concentration at the outlet of the denitrification system; The ammonia injection rate set in the denitrification system and the ammonia escape rate at the outlet of the denitrification system are obtained. The ratio between the ammonia escape rate and the ammonia injection rate is determined, and the abnormality level of ammonia escape is determined based on the ratio. Determine whether to correct the NOx concentration based on the ammonia escape anomaly level; If the NOx concentration is corrected, the real-time flue gas temperature of the branch pipe is obtained, and the operating mode is determined based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode. In correction mode, the NOx concentration is corrected based on the real-time flue gas temperature; In alarm mode, the system performs pipe blockage alarm and purging based on the real-time flue gas temperature, and corrects the NOx concentration after purging is completed. Determining whether to correct the NOx concentration based on the ammonia slip anomaly level includes: When the ammonia escape anomaly level is greater than the set anomaly level, the NOx concentration is corrected. If the ammonia escape anomaly level is less than the set anomaly level, the NOx concentration will not be corrected. The branch pipe includes a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe, and a fifth branch pipe. The branch pipe is connected to the main pipe, the main pipe is connected to the primary hot air, the outlet of the main pipe is provided with a main pipe measuring pool, the inlet of the primary hot air is provided with a first valve, and the inlet of the main pipe measuring pool is provided with a second valve. The branch pipe is equipped with a temperature sensor, which is used to detect the flue gas temperature of the branch pipe in real time. The main pipe measuring tank is equipped with an ammonia sensor and a nitrogen oxide sensor. The ammonia sensor is used to detect the amount of ammonia escape at the outlet of the denitrification system. The nitrogen oxide sensor is used to detect the NOx concentration at the outlet of the denitrification system; The operating mode is determined based on the real-time flue gas temperature, including: If any of the real-time flue gas temperatures reaches the correction threshold, and any of the real-time flue gas temperatures is lower than the alarm threshold, then the operation mode is set to alarm mode. If all temperature data in the real-time flue gas temperature do not reach the correction threshold, and all temperature data in the real-time flue gas temperature are higher than the alarm threshold, then the operation mode is set to correction mode. Correcting the NOx concentration based on the real-time flue gas temperature includes: The average flue gas temperature of the real-time flue gas temperature is determined, and the NOx concentration is corrected based on the average flue gas temperature. A preset flue gas temperature matrix Y0 is defined as Y0(Y1, Y2, Y3, Y4), where Y1 is the first preset flue gas temperature, Y2 is the second preset flue gas temperature, Y3 is the third preset flue gas temperature, and Y4 is the fourth preset flue gas temperature, and Y1 < Y2 < Y3 < Y4. A preset correction coefficient matrix h0 is defined as h0(h1, h2, h3, h4), where h1 is the first preset correction coefficient, h2 is the second preset correction coefficient, h3 is the third preset correction coefficient, and h4 is the fourth preset correction coefficient, and 1.2 < h1 < h2 < h3 < h4 < 5.

0. The real-time flue gas temperature of the branch pipe is obtained, the average flue gas temperature y of the real-time flue gas temperature is determined, and the NOx concentration C is corrected by selecting the corresponding correction coefficient according to the relationship between the average flue gas temperature y and each preset flue gas temperature. When y < Y1, the fourth preset correction coefficient h4 is selected to correct the NOx concentration C, which is C*h4. When Y1≤y<Y2, the NOx concentration C is corrected by the third preset correction coefficient h3, and the result is C*h3. When Y2≤y<Y3, the second preset correction coefficient h2 is selected to correct the NOx concentration C, which is then C*h2; When Y3≤y<Y4, the first preset correction coefficient h1 is selected to correct the NOx concentration C, which is then C*h1. Based on the real-time flue gas temperature, pipe blockage alarms and purging are performed, including: Determine the highest temperature of the real-time flue gas, set the purging time of the primary hot air according to the highest temperature, open the first valve, close the second valve, and control the primary hot air to enter the denitrification flue through the main pipe and branch pipe for purging.

2. The integrated ammonia nitrogen and temperature measurement method for a denitrification system according to claim 1, characterized in that, A ratio matrix B0 is preset, and B0(B1, B2, B3, B4) is set, where B1 is the first preset ratio, B2 is the second preset ratio, B3 is the third preset ratio, B4 is the fourth preset ratio, and B1 < B2 < B3 < B4. There is a preset ammonia escape anomaly level matrix L0, and L0(L1, L2, L3, L4) is set, where L1 is the first preset ammonia escape anomaly level, L2 is the second preset ammonia escape anomaly level, L3 is the third preset ammonia escape anomaly level, L4 is the fourth preset ammonia escape anomaly level, and L1 < L2 < L3 < L4. Calculate the ratio b between the ammonia escape amount and the ammonia injection amount, and set the ammonia escape anomaly level according to the relationship between the ratio b and each preset ratio; When b < B1, the first preset ammonia escape anomaly level L1 is set as the ammonia escape anomaly level; When B1≤b<B2, the second preset ammonia escape anomaly level L2 is set as the ammonia escape anomaly level; When B2≤b<B3, the third preset ammonia escape anomaly level L3 is set as the ammonia escape anomaly level; When B3≤b<B4, the fourth preset ammonia escape anomaly level L4 is set as the ammonia escape anomaly level.

3. An integrated ammonia nitrogen and temperature measurement system for a denitrification system, applied in the integrated ammonia nitrogen and temperature measurement method for a denitrification system as described in claim 1, characterized in that, include: The acquisition module is used to acquire the NOx concentration and ammonia slip at the outlet of the denitrification system and to acquire the real-time flue gas temperature of the branch pipe. The judgment module stores the ammonia injection rate set by the denitrification system. The judgment module is used to determine the ratio between the ammonia escape rate and the ammonia injection rate, determine the ammonia escape anomaly level based on the ratio, and determine whether to correct the NOx concentration based on the ammonia escape anomaly level. The correction module is used to determine the operating mode based on the real-time flue gas temperature. The operating mode includes a correction mode and an alarm mode. In the correction mode, the NOx concentration is corrected based on the real-time flue gas temperature. In alarm mode, the system performs pipe blockage alarm and purging based on the real-time flue gas temperature, and corrects the NOx concentration after purging is completed.

4. The integrated ammonia nitrogen and temperature measurement system for a denitrification system according to claim 3, characterized in that, The acquisition module includes: A temperature sensor is installed on the branch pipe and is used to detect the flue gas temperature of the branch pipe in real time. An ammonia sensor is installed in the main pipe measuring tank and is used to detect the amount of ammonia escape at the outlet of the denitrification system. A nitrogen oxide sensor is installed in the main pipe measuring tank and is used to detect the NOx concentration at the outlet of the denitrification system. The branch pipe includes a first branch pipe, a second branch pipe, a third branch pipe, a fourth branch pipe, and a fifth branch pipe. The branch pipe is connected to the main pipe, the main pipe is connected to the primary hot air, the main pipe measuring pool is located at the outlet of the main pipe, the primary hot air inlet is equipped with a first valve, and the inlet of the main pipe measuring pool is equipped with a second valve.

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