Intelligent urea hydrolysis control system and method
Through the intelligent urea hydrolysis control system, the amount of urea hydrolysis and steam heating are accurately controlled, which solves the problem of inaccurate control of urea hydrolysis and temperature during the ammonia production process, and the stability of the urea hydrolysis process and efficient utilization of resources are achieved.
Patent Information
- Application Number
- CN202510051527.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-05-02
AI Technical Summary
During the process of urea hydrolysis and ammonia production, the appropriate amount of urea hydrolysis and hydrolysis temperature cannot be effectively selected, resulting in incomplete denitrification or waste of resources.
The intelligent urea hydrolysis control system is adopted to calculate the initial ammonia supply by detecting the flue gas data at the SCR inlet, and then calculate the initial urea hydrolysis, and adjust the steam heating coil according to the urea hydrolysis amount. The correction module performs first and second corrections of the urea hydrolysis amount based on the actual ammonia supply amount of SCR and the flue gas data at the outlet. The risk module detects environmental data abnormalities and formulates solutions.
Accurate control of the amount of urea hydrolysis is achieved, the problems of incomplete denitrification or waste of resources are avoided, and the stability and controllability of the reaction are improved.
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Figure CN119916684A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of thermal power generation, and in particular to an intelligent urea hydrolysis control system and method. Background Art
[0002] Since the 20th century, the global urbanization process has accelerated and the urban population has grown rapidly. A large number of infrastructure constructions in cities, such as residential, commercial buildings, and transportation systems, require a stable power supply. Thermal power generation can meet large-scale power demand and provide power for various electrical equipment such as urban lighting, elevators, and air conditioners. Most of the large and medium-sized thermal power units in China have completed the ultra-low emission transformation of denitrification. Denitrification reductants are used in large quantities, mainly liquid ammonia, ammonia water, and urea. However, liquid ammonia and ammonia water are toxic, easy to cause explosions, and have high transportation costs. Urea ammonia production technology has gradually become the mainstream technology for power plants to choose denitrification reductant preparation systems because it does not require loading, unloading, transportation, and storage of hazardous chemicals, the device occupies a small area, and the operation is safe, stable, and reliable.
[0003] However, the inventors of this application found that the above technology has at least the following technical problems in the process of implementing the technical solution of the invention in the embodiment of this application: During the denitrification process, it is impossible to more effectively select the appropriate urea hydrolysis amount, and the hydrolysis temperature cannot be effectively selected when the urea hydrolysis amount increases or decreases, resulting in incomplete denitrification or waste of resources. Summary of the invention
[0004] The embodiment of the present invention provides an intelligent urea hydrolysis control system and method, which are used to solve the technical problem of inaccurate control of urea hydrolysis amount in the process of urea hydrolysis to produce ammonia in the prior art.
[0005] In order to achieve the above object, the present invention provides an intelligent urea hydrolysis control system, comprising: A detection module, used for detecting flue gas data at the inlet of the SCR, and obtaining an initial ammonia supply amount according to the flue gas data at the inlet of the SCR, wherein the flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; A hydrolysis module, used for calculating an initial urea hydrolysis amount according to the initial ammonia supply amount, and adjusting a steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount; A correction module, used for obtaining the actual ammonia supply amount of the SCR and the flue gas data at the outlet of the SCR after the hydrolyzed ammonia enters the SCR, judging whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and judging whether it is necessary to perform a second correction on the current urea hydrolysis amount according to the flue gas data at the outlet of the SCR; A risk module, used to obtain environmental data and determine whether the environmental data is abnormal, wherein the environmental data includes the liquid level, internal pressure, and internal temperature of the urea hydrolysis tank; The formulation module is used to determine the cause of the abnormality of the environmental data if there is an abnormality in the environmental data, and formulate corresponding solutions according to the cause of the abnormality.
[0006] Furthermore, the detection module is used to obtain the initial ammonia supply amount according to the flue gas data at the SCR inlet, including: The calculation formula for the initial ammonia supply is: ; in, is the initial ammonia supply, is the flue gas flow rate at the SCR inlet, is the flue gas nitrogen oxide concentration at the SCR inlet, is the molar mass of nitrogen oxides in the flue gas at the SCR inlet, is the molar mass of ammonia, is the molar ratio of ammonia to nitrogen.
[0007] Furthermore, the hydrolysis module is used to calculate the initial urea hydrolysis amount according to the initial ammonia supply amount, including: Preset the default urea hydrolysis rate and calculate the initial urea hydrolysis amount: ; in, is the initial urea hydrolysis amount, is the default urea hydrolysis rate, is the initial ammonia supply.
[0008] Furthermore, the hydrolysis module is used to adjust the steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount, including: Presetting a first urea hydrolysis amount and a second urea hydrolysis amount, wherein the first urea hydrolysis amount is smaller than the second urea hydrolysis amount; A first steam heating coil, a second steam heating coil and a third steam heating coil are preset; If the initial urea hydrolysis amount is less than or equal to the first urea hydrolysis amount, turning on the first steam heating coil; If the initial urea hydrolysis amount is greater than the first urea hydrolysis amount and less than the second urea hydrolysis amount, turning on the second steam heating coil; If the initial urea hydrolysis amount is greater than or equal to the second urea hydrolysis amount, the third steam heating coil is turned on.
[0009] Furthermore, the correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, including: A first error range is preset according to the initial ammonia supply amount. If the actual ammonia supply amount of the SCR is not within the first error range, it is determined that a first correction is required.
[0010] Furthermore, the correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, including: The actual urea hydrolysis rate is calculated based on the actual ammonia supply of the SCR: ; in, is the actual urea hydrolysis rate, is the molar mass of urea, is the actual ammonia supply to SCR, is the molar mass of ammonia, is the initial urea hydrolysis amount; The first corrected urea hydrolysis amount after the first correction is calculated according to the actual urea hydrolysis rate: ; in, is the first corrected urea hydrolysis amount.
[0011] Furthermore, the correction module is used to determine whether a second correction needs to be performed on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, including: Obtain the flue gas nitrogen oxide concentration and the flue gas flow rate at the SCR outlet at multiple times, and normalize them all; Calculate the average value of the flue gas nitrogen oxide concentration at the SCR outlet and the average value of the flue gas flow rate at the SCR outlet after normalization, and obtain the second correction factor: ; in, is the second correction factor, a is the influence factor of nitrogen oxide concentration, b is the influence factor of flue gas flow, where a+b=1, a=0.73, b=0.27, j is the number of moments, is the flue gas nitrogen oxide concentration at the SCR outlet at the i-th moment, is the average value of flue gas nitrogen oxide concentration at the SCR outlet, is the flue gas flow rate at the SCR outlet at the i-th moment, is the average value of flue gas flow at the SCR outlet.
[0012] Furthermore, the correction module is used to determine whether a second correction needs to be performed on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, including: Presetting a first error factor and a second error factor, wherein the first error factor is smaller than the second error factor; Presetting a first adjustment coefficient and a second adjustment coefficient; If the second correction factor is smaller than the first error factor, it is determined that the second correction is not necessary; If the second correction factor is greater than or equal to the first error factor, and the second correction factor is less than the second error factor, the first adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the first adjustment coefficient and the current urea hydrolysis amount; If the second correction factor is greater than or equal to the second error factor, the second adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the second adjustment coefficient and the current urea hydrolysis amount.
[0013] Furthermore, the formulation module is used to determine the cause of the abnormality of the environmental data if the environmental data is abnormal, and formulate corresponding solutions according to the cause of the abnormality, including: Preset urea hydrolysis tank liquid level range, internal pressure range, and internal temperature range; If the liquid level of the urea hydrolysis tank is not within the liquid level range of the urea hydrolysis tank, it is determined that there is a liquid level abnormality in the environmental data, and it is determined whether to replenish the urea solution or discharge the urea solution; If the internal pressure is not within the internal pressure range, it is determined that there is a pressure anomaly in the environmental data, and it is determined whether to increase the internal pressure or whether to reduce the internal pressure; If the internal temperature is not within the internal temperature range, it is determined that there is a temperature anomaly in the environmental data, and it is determined whether to increase the internal temperature or whether to decrease the internal temperature.
[0014] In order to achieve the above object, the present invention also provides an intelligent urea hydrolysis control method, comprising: Detecting flue gas data at the SCR inlet, and obtaining an initial ammonia supply amount according to the flue gas data at the SCR inlet, wherein the flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; Calculating an initial urea hydrolysis amount according to the initial ammonia supply amount, and adjusting the steam heating coil in the urea hydrolysis tank according to the initial urea hydrolysis amount; After the hydrolyzed ammonia enters the SCR, the actual ammonia supply amount of the SCR and the flue gas data at the SCR outlet are obtained, and whether the initial urea hydrolysis amount needs to be corrected first according to the actual ammonia supply amount of the SCR, and whether the current urea hydrolysis amount needs to be corrected second according to the flue gas data at the SCR outlet; Acquiring environmental data and determining whether the environmental data is abnormal, wherein the environmental data includes a liquid level, an internal pressure, and an internal temperature of a urea hydrolysis tank; If the environmental data is abnormal, determine the cause of the abnormality and formulate corresponding solutions based on the cause of the abnormality.
[0015] Compared with the prior art, the present invention has the following beneficial effects: The invention discloses an intelligent urea hydrolysis control system and method. The amount of ammonia required for denitration is calculated according to the flue gas nitrogen oxide concentration and the flue gas flow rate in the SCR, and the urea hydrolysis amount is calculated according to the required ammonia amount, so as to avoid waste of resources caused by excessive urea hydrolysis or incomplete flue gas denitration caused by insufficient urea hydrolysis. At the same time, corresponding steam heating coils are selected for heating according to different urea hydrolysis amounts, so as to ensure that the hydrolysis efficiency is not affected when the urea hydrolysis amount changes, thereby improving the stability and controllability of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings: Figure 1 A schematic diagram of the structure of an intelligent urea hydrolysis control system in an embodiment of the present invention is shown; Figure 2 A schematic flow chart of an intelligent urea hydrolysis control method in an embodiment of the present invention is shown. DETAILED DESCRIPTION
[0017] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0018] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0019] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.
[0020] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0021] The following is a description of preferred embodiments of the present invention with reference to the accompanying drawings.
[0022] like Figure 1 As shown, an embodiment of the present invention discloses an intelligent urea hydrolysis control system, comprising: The detection module is used to detect the flue gas data at the SCR inlet and obtain the initial ammonia supply amount according to the flue gas data at the SCR inlet. The flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; A hydrolysis module, used for calculating an initial urea hydrolysis amount according to an initial ammonia supply amount, and adjusting a steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount; A correction module is used to obtain the actual ammonia supply amount of the SCR and the flue gas data at the SCR outlet after the hydrolyzed ammonia enters the SCR, and to determine whether a first correction is required for the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and to determine whether a second correction is required for the current urea hydrolysis amount according to the flue gas data at the SCR outlet; The risk module is used to obtain environmental data and determine whether there are any abnormalities in the environmental data. The environmental data includes the liquid level, internal pressure, and internal temperature of the urea hydrolysis tank; The development module is used to determine the cause of the abnormal environmental data if there is an abnormality in the environmental data, and to develop corresponding solutions based on the cause of the abnormality.
[0023] In this embodiment, the urea hydrolysis control system is started in the following two situations: (1) Cold start: When there is no material in the hydrolysis module, follow the steps to fill, heat up, and exhaust until it is put into operation.
[0024] (2) Hot start: The hydrolysis module is put into operation again when it is in a normal shutdown and insulation state.
[0025] In this embodiment, the urea hydrolysis control system is stopped in the following three situations: (1) Normal stop: When the SCR does not need to supply ammonia, the operator stops supplying urea solution and steam to the hydrolysis module, gradually reducing the system's operating pressure and temperature.
[0026] (2) Emergency stop: This means that the hydrolysis module has a serious fault and can no longer operate normally. It is necessary to quickly reduce the system's operating pressure and temperature, and decide whether to drain the reaction liquid based on the scope of the fault.
[0027] (3) Long-term shutdown: If the shutdown time is greater than 3 days, the operation will be stopped according to the normal shutdown procedure, and the reaction liquid in the hydrolysis module will be emptied, the cleaning procedure will be performed, and the module will be sealed and not used for a long time.
[0028] In some embodiments of the present application, the detection module is used to obtain the initial ammonia supply amount according to the flue gas data at the SCR inlet, including: The calculation formula for the initial ammonia supply is: ; in, is the initial ammonia supply, is the flue gas flow rate at the SCR inlet, is the flue gas nitrogen oxide concentration at the SCR inlet, is the molar mass of nitrogen oxides in the flue gas at the SCR inlet, is the molar mass of ammonia, is the molar ratio of ammonia to nitrogen.
[0029] In this embodiment, the amount of ammonia required for flue gas denitrification is determined based on the flue gas data in the SCR.
[0030] In some embodiments of the present application, the hydrolysis module is used to calculate the initial urea hydrolysis amount according to the initial ammonia supply amount, including: Preset the default urea hydrolysis rate and calculate the initial urea hydrolysis amount: ; in, is the initial urea hydrolysis amount, is the default urea hydrolysis rate, is the initial ammonia supply.
[0031] The beneficial effect of the above technical solution is that the initial urea hydrolysis amount is obtained according to the initial ammonia supply amount, thereby avoiding blind selection of the urea hydrolysis amount.
[0032] In this embodiment, the hydrolysis module is used to adjust the steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount, and also includes: Presetting a first urea hydrolysis amount and a second urea hydrolysis amount, wherein the first urea hydrolysis amount is smaller than the second urea hydrolysis amount; A first steam heating coil, a second steam heating coil and a third steam heating coil are preset; If the initial urea hydrolysis amount is less than or equal to the first urea hydrolysis amount, the first steam heating coil is turned on; If the initial urea hydrolysis amount is greater than the first urea hydrolysis amount and less than the second urea hydrolysis amount, the second steam heating coil is turned on; If the initial urea hydrolysis amount is greater than or equal to the second urea hydrolysis amount, the third steam heating coil is turned on.
[0033] The beneficial effect of the above technical solution is: selecting a suitable steam heating coil according to the initial urea hydrolysis amount, thereby reducing the influence of temperature on the urea hydrolysis process.
[0034] In some embodiments of the present application, the correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, including: A first error range is preset according to the initial ammonia supply amount. If the actual ammonia supply amount of the SCR is not within the first error range, it is determined that a first correction is required.
[0035] In this embodiment, the actual amount of ammonia supplied to the SCR after urea hydrolysis is obtained to determine whether the ammonia generated by the initial hydrolysis amount of urea reaches a preset standard.
[0036] In this embodiment, the correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, including: Calculate the actual urea hydrolysis rate based on the actual ammonia supply of SCR: ; in, is the actual urea hydrolysis rate, is the molar mass of urea, is the actual ammonia supply to SCR, is the molar mass of ammonia, is the initial urea hydrolysis amount; Calculate the first corrected urea hydrolysis amount after the first correction according to the actual urea hydrolysis rate: ; in, is the first corrected urea hydrolysis amount.
[0037] In this embodiment: the actual urea hydrolysis rate of urea hydrolyzed into ammonia is obtained, the initial urea hydrolysis amount is first corrected, and the steam heating coil is reselected based on the corrected first corrected urea hydrolysis amount and the preset first urea hydrolysis amount and second urea hydrolysis amount.
[0038] The beneficial effect of the above technical solution is: avoiding a large difference between the actual urea hydrolysis rate and the default urea hydrolysis amount under different working conditions, performing a first correction according to the actual urea hydrolysis rate, and improving urea utilization.
[0039] In some embodiments of the present application, the correction module is used to determine whether it is necessary to perform a second correction on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, including: Obtain the flue gas nitrogen oxide concentration and the flue gas flow rate at the SCR outlet at multiple times, and normalize them all; Calculate the average value of the flue gas nitrogen oxide concentration at the SCR outlet and the average value of the flue gas flow rate at the SCR outlet after normalization, and obtain the second correction factor: ; in, is the second correction factor, a is the influence factor of nitrogen oxide concentration, b is the influence factor of flue gas flow, where a+b=1, a=0.73, b=0.27, j is the number of moments, is the flue gas nitrogen oxide concentration at the SCR outlet at the i-th moment, is the average value of flue gas nitrogen oxide concentration at the SCR outlet, is the flue gas flow rate at the SCR outlet at the i-th moment, is the average value of flue gas flow at the SCR outlet.
[0040] In this embodiment, the flue gas data at the SCR outlet is obtained, and whether the ideal denitrification effect is achieved is determined based on the indicators formed by the flue gas data at the outlet, wherein the nitrogen oxide concentration in the flue gas is the sum of the nitrogen monoxide concentration and the nitrogen dioxide concentration in the flue gas.
[0041] In this embodiment, the correction module is used to determine whether it is necessary to perform a second correction on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, including: Presetting a first error factor and a second error factor, wherein the first error factor is smaller than the second error factor; Presetting a first adjustment coefficient and a second adjustment coefficient; If the second correction factor is smaller than the first error factor, it is determined that the second correction is not necessary; If the second correction factor is greater than or equal to the first error factor, and the second correction factor is less than the second error factor, the first adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the first adjustment coefficient and the current urea hydrolysis amount; If the second correction factor is greater than or equal to the second error factor, the second adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the second adjustment coefficient and the current urea hydrolysis amount.
[0042] In this embodiment, the steam heating coil is reselected based on the comparison between the corrected second corrected urea hydrolysis amount and the preset first urea hydrolysis amount and the second urea hydrolysis amount.
[0043] The beneficial effect of the above technical solution is: to avoid the situation where the ideal denitrification effect cannot be achieved after the first correction, the urea hydrolysis amount is corrected again based on the SCR outlet flue gas data to achieve the ideal denitrification effect.
[0044] In some embodiments of the present application, a formulation module is used to determine the cause of the abnormality of the environmental data if there is an abnormality in the environmental data, and formulate corresponding solutions according to the cause of the abnormality, including: Preset urea hydrolysis tank liquid level range, internal pressure range, and internal temperature range; If the liquid level of the urea hydrolysis tank is not within the liquid level range of the urea hydrolysis tank, it is determined that there is a liquid level abnormality in the environmental data, and it is determined whether to replenish the urea solution or discharge the urea solution; If the internal pressure is not within the internal pressure range, it is determined that there is a pressure anomaly in the environmental data, and it is determined whether to increase the internal pressure or whether to reduce the internal pressure; If the internal temperature is not within the internal temperature range, it is determined that there is a temperature anomaly in the environmental data, and it is determined whether to increase the internal temperature or whether to decrease the internal temperature.
[0045] In this embodiment, when the liquid level data is abnormal, the standby liquid level sensor is turned on. If the standby liquid level sensor detects that the liquid level is normal, it is determined that the liquid level sensor is abnormal and needs to be repaired; if the standby liquid level sensor detects that the liquid level data is still abnormal, the following operations are performed respectively: (1) When the liquid level in the urea hydrolysis tank is higher than the liquid level range of the urea hydrolysis tank, check whether the urea feed regulating valve is normal. If the urea feed regulating valve is abnormal, open the regulating valve bypass valve to maintain the liquid level, discharge excess liquid, and check and repair the regulating valve.
[0046] (2) When the liquid level of the urea hydrolysis tank is lower than the liquid level range of the urea hydrolysis tank, check whether the urea feed regulating valve is normal. If the urea feed regulating valve is abnormal, open the bypass switch valve to maintain the reactor liquid level.
[0047] In this embodiment, when the pressure data is abnormal, it is detected whether the steam heating coil is operating normally. If the steam heating coil is abnormal, the steam heating coil is repaired; if the steam heating coil is normal, the following operations are performed respectively: (1) If the current internal pressure is higher than the internal pressure range, the steam supply system will be shut down in stages until the internal pressure returns to normal.
[0048] (2) If the current internal pressure is lower than the internal pressure range, increase the steam supply until the internal pressure returns to normal.
[0049] In this embodiment, when the temperature data is abnormal, the following operations are performed respectively: (1) If the internal temperature is higher than the internal temperature range, reduce the steam flow until the internal temperature returns to normal.
[0050] (2) If the internal temperature is lower than the internal temperature range, increase the steam flow rate until the internal temperature returns to normal.
[0051] The beneficial effects of the above technical solution are: detecting environmental data, preventing environmental data from being abnormal, affecting the urea hydrolysis reaction, and improving system controllability.
[0052] In order to further explain the technical idea of the present invention, the technical solution of the present invention is now described in combination with specific application scenarios.
[0053] Correspondingly, such as Figure 2 As shown, the present application also provides an intelligent urea hydrolysis control method, comprising: S110: Detect the flue gas data at the SCR inlet, and obtain the initial ammonia supply amount according to the flue gas data at the SCR inlet. The flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; S120: calculating an initial urea hydrolysis amount according to an initial ammonia supply amount, and adjusting a steam heating coil in a urea hydrolysis tank according to the initial urea hydrolysis amount; S130: obtaining the actual ammonia supply amount of the SCR and the flue gas data at the outlet of the SCR after the hydrolyzed ammonia enters the SCR, judging whether it is necessary to make a first correction to the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and judging whether it is necessary to make a second correction to the current urea hydrolysis amount according to the flue gas data at the outlet of the SCR; S140: Acquire environmental data and determine whether the environmental data is abnormal, the environmental data including the liquid level, internal pressure, and internal temperature of the urea hydrolysis tank; S150: If there is an abnormality in the environmental data, determine the cause of the abnormality and formulate corresponding solutions based on the cause of the abnormality.
[0054] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.
[0055] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed by the present invention may be used in combination with each other in any manner, and the fact that these combinations are not fully described in this specification is only for the sake of omitting space and saving resources.
[0056] Those skilled in the art can understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. An intelligent urea hydrolysis control system, characterized in that: include: A detection module, used for detecting flue gas data at the inlet of the SCR, and obtaining an initial ammonia supply amount according to the flue gas data at the inlet of the SCR, wherein the flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; A hydrolysis module, used for calculating an initial urea hydrolysis amount according to the initial ammonia supply amount, and adjusting a steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount; A correction module, used for obtaining the actual ammonia supply amount of the SCR and the flue gas data at the outlet of the SCR after the hydrolyzed ammonia enters the SCR, judging whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and judging whether it is necessary to perform a second correction on the current urea hydrolysis amount according to the flue gas data at the outlet of the SCR; A risk module, used to obtain environmental data and determine whether the environmental data is abnormal, wherein the environmental data includes the liquid level, internal pressure, and internal temperature of the urea hydrolysis tank; The formulation module is used to determine the cause of the abnormality of the environmental data if there is an abnormality in the environmental data, and formulate corresponding solutions according to the cause of the abnormality.
2. The intelligent urea hydrolysis control system according to claim 1, characterized in that: The detection module is used to obtain the initial ammonia supply amount according to the flue gas data at the SCR inlet, including: The calculation formula for the initial ammonia supply is: ； in, is the initial ammonia supply, is the flue gas flow rate at the SCR inlet, is the flue gas nitrogen oxide concentration at the SCR inlet, is the molar mass of nitrogen oxides in the flue gas at the SCR inlet, is the molar mass of ammonia, is the molar ratio of ammonia to nitrogen.
3. The intelligent urea hydrolysis control system according to claim 1 is characterized in that: The hydrolysis module is used to calculate the initial urea hydrolysis amount according to the initial ammonia supply amount, including: Preset the default urea hydrolysis rate and calculate the initial urea hydrolysis amount: ； in, is the initial urea hydrolysis amount, is the default urea hydrolysis rate, is the initial ammonia supply.
4. The intelligent urea hydrolysis control system according to claim 1, characterized in that: The hydrolysis module is used to adjust the steam heating coil in the hydrolysis module according to the initial urea hydrolysis amount, including: Presetting a first urea hydrolysis amount and a second urea hydrolysis amount, wherein the first urea hydrolysis amount is smaller than the second urea hydrolysis amount; A first steam heating coil, a second steam heating coil and a third steam heating coil are preset; If the initial urea hydrolysis amount is less than or equal to the first urea hydrolysis amount, turning on the first steam heating coil; If the initial urea hydrolysis amount is greater than the first urea hydrolysis amount and less than the second urea hydrolysis amount, turning on the second steam heating coil; If the initial urea hydrolysis amount is greater than or equal to the second urea hydrolysis amount, the third steam heating coil is turned on.
5. The intelligent urea hydrolysis control system according to claim 1, characterized in that: The correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and includes: A first error range is preset according to the initial ammonia supply amount. If the actual ammonia supply amount of the SCR is not within the first error range, it is determined that a first correction is required.
6. The intelligent urea hydrolysis control system according to claim 5, characterized in that: The correction module is used to determine whether it is necessary to perform a first correction on the initial urea hydrolysis amount according to the actual ammonia supply amount of the SCR, and includes: The actual urea hydrolysis rate is calculated based on the actual ammonia supply of the SCR: ； in, is the actual urea hydrolysis rate, is the molar mass of urea, is the actual ammonia supply to SCR, is the molar mass of ammonia, is the initial urea hydrolysis amount; The first corrected urea hydrolysis amount after the first correction is calculated according to the actual urea hydrolysis rate: ； in, is the first corrected urea hydrolysis amount.
7. The intelligent urea hydrolysis control system according to claim 1, characterized in that: The correction module is used to determine whether a second correction needs to be performed on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, and includes: Obtain the flue gas nitrogen oxide concentration and the flue gas flow rate at the SCR outlet at multiple times, and normalize them all; Calculate the average value of the flue gas nitrogen oxide concentration at the SCR outlet and the average value of the flue gas flow rate at the SCR outlet after normalization, and obtain the second correction factor: ； in, is the second correction factor, a is the influence factor of nitrogen oxide concentration, b is the influence factor of flue gas flow, where a+b=1, a=0.73, b=0.27, j is the number of moments, is the flue gas nitrogen oxide concentration at the SCR outlet at the i-th moment, is the average value of flue gas nitrogen oxide concentration at the SCR outlet, is the flue gas flow rate at the SCR outlet at the i-th moment, is the average value of flue gas flow at the SCR outlet.
8. The intelligent urea hydrolysis control system according to claim 7, characterized in that: The correction module is used to determine whether a second correction needs to be performed on the current urea hydrolysis amount according to the flue gas data at the SCR outlet, and includes: Presetting a first error factor and a second error factor, wherein the first error factor is smaller than the second error factor; Presetting a first adjustment coefficient and a second adjustment coefficient; If the second correction factor is smaller than the first error factor, it is determined that the second correction is not necessary; If the second correction factor is greater than or equal to the first error factor, and the second correction factor is less than the second error factor, the first adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the first adjustment coefficient and the current urea hydrolysis amount; If the second correction factor is greater than or equal to the second error factor, the second adjustment coefficient is selected to perform a second correction on the current urea hydrolysis amount, and the second corrected urea hydrolysis amount is the product of the second adjustment coefficient and the current urea hydrolysis amount.
9. The intelligent urea hydrolysis control system according to claim 1, characterized in that: The formulation module is used to determine the cause of the abnormality of the environmental data if the environmental data is abnormal, and formulate corresponding solutions according to the cause of the abnormality, including: Preset urea hydrolysis tank liquid level range, internal pressure range, and internal temperature range; If the liquid level of the urea hydrolysis tank is not within the liquid level range of the urea hydrolysis tank, it is determined that there is a liquid level abnormality in the environmental data, and it is determined whether to replenish the urea solution or discharge the urea solution; If the internal pressure is not within the internal pressure range, it is determined that there is a pressure anomaly in the environmental data, and it is determined whether to increase the internal pressure or whether to reduce the internal pressure; If the internal temperature is not within the internal temperature range, it is determined that there is a temperature anomaly in the environmental data, and it is determined whether to increase the internal temperature or whether to decrease the internal temperature.
10. An intelligent urea hydrolysis control method, characterized in that: include: Detecting flue gas data at the SCR inlet, and obtaining an initial ammonia supply amount according to the flue gas data at the SCR inlet, wherein the flue gas data includes flue gas nitrogen oxide concentration and flue gas flow rate; Calculating an initial urea hydrolysis amount according to the initial ammonia supply amount, and adjusting the steam heating coil in the urea hydrolysis tank according to the initial urea hydrolysis amount; After the hydrolyzed ammonia enters the SCR, the actual ammonia supply amount of the SCR and the flue gas data at the SCR outlet are obtained, and whether the initial urea hydrolysis amount needs to be corrected first according to the actual ammonia supply amount of the SCR, and whether the current urea hydrolysis amount needs to be corrected second according to the flue gas data at the SCR outlet; Acquiring environmental data and determining whether the environmental data is abnormal, wherein the environmental data includes a liquid level, an internal pressure, and an internal temperature of a urea hydrolysis tank; If the environmental data is abnormal, determine the cause of the abnormality and formulate corresponding solutions based on the cause of the abnormality.