A control method of a tail gas SCR denitration system of an SCV gasifier and an electronic device

Abstract

The application provides a control method of a tail gas SCR denitration system of an SCV gasifier and electronic equipment. The SCR denitration system is coupled with the SCV gasifier and is used for processing tail gas of the SCV gasifier. The control method comprises the following steps: collecting a characteristic parameter related to a load of the SCV gasifier; screening out abnormal data in the characteristic parameter through an adaptive algorithm, and taking the characteristic parameter after the abnormal data is screened out as host load data of the SCV gasifier; and performing linkage control on operation parameters of the SCR denitration system according to the host load data of the SCV gasifier. The application can make the SCR denitration system actively match the load variation of the adaptive SCV gasifier.

Description

Technical Field

[0001] This invention relates to the fields of gasification and environmental protection technology, and in particular to a control method and electronic equipment for an SCR denitrification system of tail gas from an SCV gasifier. Background Technology

[0002] Submerged combustion vaporizers (SCVs) produce NO during combustion. x NO x It is a major contributor to air pollution; it is emitted into the atmosphere along with vehicle exhaust, producing NOx in exhaust gases. x Pollution emissions. With increasingly stringent national environmental policies and stricter emission standards, reducing NOx emissions from SCVs (Self-Containing Vulnerabilities) is crucial. x Emission concentration has become an inevitable trend in the industry.

[0003] Currently, all SCVs used both domestically and internationally employ low-NOx combustion control technology, which reduces NOx emissions during combustion by controlling the combustion process. x The table below shows the NO generated from the SCV tail gas used in some domestic LNG (Liquefied Natural Gas) receiving stations. x Emissions data and the corresponding technologies used.

[0004] Low-NOx combustion technology Graded + Premixed Central flame water jet Central flame water jet <![CDATA[NO x mg / m 3 ]]> 60～70 70～80 70～80

[0005] As can be seen from the table above, low-NOx combustion control technology can only reduce NOx levels. x Reduced to 60-80 mg / m³ 3 The target cannot be lowered (NO). x ≤30mg / m 3 The emission requirements of SCV vaporizers are not met due to their large load, small space, and wide load adjustment range (10-105%). Combustion control technology alone cannot meet the need for further reduction of NO in exhaust gases. x Requirements for emission concentrations.

[0006] Therefore, the combined application of low-NOx combustion technology and post-combustion denitrification technology has become a practical and feasible technical solution for addressing the ultra-low NOx emissions problem of SCVs. SCR (Selective Catalytic Reduction) denitrification technology, as the main approach for post-combustion exhaust gas denitrification, has become a key research focus. Due to the specific application scenarios and limited market reach of SCV gasifiers, there are currently no research or application examples of SCR denitrification for SCV gasifier exhaust gas. Therefore, there is an urgent need in this field for an effective control scheme for the SCR denitrification system of SCV gasifier exhaust gas. Summary of the Invention

[0007] In view of the above problems, the present invention provides a control method and electronic device for an SCR denitrification system of an SCV vaporizer tail gas that overcomes or at least partially solves the above problems.

[0008] One objective of this invention is to enable the SCR denitrification system to actively adapt to the load variations of the adaptive SCV vaporizer.

[0009] A further objective of this invention is to reduce the load diagnosis error of the SCV vaporizer caused by data offset.

[0010] Another further objective of this invention is to precisely control the operation of the SCR denitrification system and avoid energy and material waste caused by extensive management.

[0011] Another objective of this invention is to achieve linear linkage between the amount of denitrification reducing agent injected and the load of the SCV main unit, thereby avoiding secondary pollution of exhaust gas caused by excessive injection of reducing agent and unreasonable consumption of reducing agent.

[0012] In particular, according to one aspect of the present invention, a control method for an SCR denitrification system of an SCV vaporizer tail gas is provided, wherein the SCR denitrification system is coupled to the SCV vaporizer and is used to treat the tail gas of the SCV vaporizer, wherein the control method includes:

[0013] Collect characteristic parameters related to the load of the SCV vaporizer;

[0014] Abnormal data in the feature parameters are filtered out using an adaptive algorithm, and the feature parameters after filtering out abnormal data are used as the main load data of the SCV gasifier.

[0015] The operating parameters of the SCR denitrification system are controlled in conjunction with the main unit load data of the SCV gasifier.

[0016] Optionally, the adaptive algorithm is a time difference filtering method.

[0017] Optionally, the characteristic parameters include the blower frequency, and the operating parameters include the main exhaust fan frequency;

[0018] The step of linking and controlling the operating parameters of the SCR denitrification system based on the main unit load data of the SCV vaporizer includes:

[0019] When initially setting the frequency of the main exhaust fan of the SCR denitrification system, the initial frequency matching coefficient between the preset main exhaust fan frequency and the blower frequency is used as the current frequency matching coefficient between the main exhaust fan frequency and the blower frequency. The main exhaust fan frequency is determined and controlled based on the blower frequency and the current frequency matching coefficient.

[0020] Optionally, the characteristic parameter further includes exhaust pressure;

[0021] The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes:

[0022] Determine whether the exhaust pressure is greater than the first pressure threshold;

[0023] If the exhaust pressure is greater than the first pressure threshold, then the first frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the first preset relationship table as the current frequency matching coefficient, and the first frequency matching coefficient is greater than the initial frequency matching coefficient.

[0024] If the exhaust pressure is less than or equal to the first pressure threshold, then determine whether the exhaust pressure is less than the second pressure threshold, wherein the second pressure threshold is less than the first pressure threshold;

[0025] If the exhaust pressure is less than the second pressure threshold, then the second frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the second preset relationship table as the current frequency matching coefficient. The second frequency matching coefficient is less than the initial frequency matching coefficient. The first preset relationship table and the second preset relationship table record the correspondence between different ranges of exhaust pressure and different frequency matching coefficients.

[0026] If the exhaust pressure is greater than or equal to the second pressure threshold, then the current frequency matching coefficient is maintained;

[0027] The frequency of the main exhaust fan is determined and controlled based on the blower frequency and the current frequency matching system.

[0028] Optionally, the characteristic parameters include burner flow rate or burner load, and the operating parameters include gas-fired furnace load;

[0029] The step of linking and controlling the operating parameters of the SCR denitrification system based on the main unit load data of the SCV vaporizer includes:

[0030] The load of the gas-fired heating furnace is determined and controlled based on the burner flow rate or burner load, using a first preset linear function. The independent variable of the first preset linear function is the burner flow rate or burner load, the dependent variable is the gas-fired heating furnace load, the slope is greater than zero, and the first preset linear function is pre-calibrated through on-site testing of the SCV gasifier and the SCR denitrification system.

[0031] Optionally, the characteristic parameters include burner flow rate or burner load, and the operating parameters include reducing agent injection flow rate;

[0032] The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes:

[0033] The reducing agent injection flow rate is determined and controlled based on the burner flow rate or burner load using a second preset linear function. The independent variable of the second preset linear function is the burner flow rate or burner load, the dependent variable is the reducing agent injection flow rate, the slope is greater than zero, and the second preset linear function is pre-calibrated through on-site testing of the SCV vaporizer and the SCR denitrification system.

[0034] Optionally, the operating parameters may also include compressed air pressure;

[0035] The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes:

[0036] Based on the determined reducing agent injection flow rate, the compressed air pressure is determined and controlled based on a third preset linear function, wherein the independent variable of the third preset linear function is the reducing agent injection flow rate, the dependent variable is the compressed air pressure, the slope is less than zero, and the third preset linear function is pre-calibrated through on-site testing of the SCR denitrification system.

[0037] Optionally, the characteristic parameters may further include host temperature and / or exhaust temperature;

[0038] The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes:

[0039] Monitor changes in the main unit temperature and / or exhaust temperature, and adjust the load of the gas-fired heating furnace according to the changes in the main unit temperature and / or exhaust temperature.

[0040] Optionally, the step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier further includes:

[0041] The outlet temperature of the gas-fired heater is periodically acquired, and the difference between the outlet temperature and the target temperature is calculated. If the difference is greater than the upper limit of the preset fluctuation range, the load of the gas-fired heater is reduced by a preset step size. If the difference is less than the lower limit of the preset fluctuation range, the load of the gas-fired heater is increased by a preset step size until the difference is within the preset fluctuation range.

[0042] According to another aspect of the present invention, an electronic device is also provided, including a memory, a processor, and a machine-executable program stored in the memory and running on the processor, wherein the processor executes the machine-executable program to implement the aforementioned control method for the tail gas SCR denitrification system of the SCV vaporizer.

[0043] In the control method of the tail gas SCR denitrification system of the SCV gasifier of the present invention, characteristic parameters related to the load of the SCV gasifier are collected as the main load data of the SCV gasifier, and the operating parameters of the SCR denitrification system are linked and controlled according to the main load data of the SCV gasifier, so that the SCR denitrification system can actively match and adapt to the load changes of the SCV gasifier.

[0044] Furthermore, in the control method of the tail gas SCR denitrification system of the SCV vaporizer of the present invention, abnormal data of different characteristic parameters of the SCV vaporizer collected from multiple points are filtered out by an adaptive algorithm (specifically, a time difference filtering method can be used), so that the main load data of the SCV vaporizer can more accurately reflect the load status and reduce the load diagnosis error of the system caused by the deviation of single-point data.

[0045] Furthermore, in the control method of the SCV gasifier tail gas SCR denitrification system of the present invention, the main key characteristic parameters of the SCV gasifier operation, such as blower frequency, burner flow or load, main unit temperature, exhaust temperature, and exhaust pressure, are collected. This method can comprehensively reflect the subtle changes in the operating load of the SCV gasifier. Then, based on specific logic, the operating parameters of the SCR denitrification system, such as the gas furnace load, main exhaust fan frequency, reducing agent injection flow, and compressed air pressure, are linked and controlled to accurately control the operation of the SCR denitrification system and avoid energy and material waste caused by extensive management.

[0046] Furthermore, in the control method of the tail gas SCR denitrification system of the SCV vaporizer of the present invention, the amount of denitrification reducing agent injected is linearly linked with the load of the SCV main unit, so as to avoid secondary pollution of tail gas caused by excessive injection of reducing agent and unreasonable consumption of reducing agent.

[0047] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below.

[0048] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0049] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0050] Figure 1 A schematic flowchart of a control method for an SCR denitrification system of an SCV vaporizer tail gas according to an embodiment of the present invention is shown.

[0051] Figure 2 A schematic diagram of the logic for the linkage control of the operating parameters of the SCR denitrification system based on the main load data of the SCV gasifier is shown in the control method of the tail gas SCR denitrification system of the SCV gasifier according to another embodiment of the present invention.

[0052] Figure 3 A schematic structural block diagram of an electronic device according to an embodiment of the present invention is shown. Detailed Implementation

[0053] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0054] The inventors of this application discovered through research that SCV vaporizers are characterized by large fluctuations in operating load (10-105%) and frequent load changes, making it difficult for the SCR denitrification system downstream of the SCV vaporizer to match its operation. To better match the SCR denitrification process with SCV operating conditions and optimize SCR operating economics, it is necessary to develop a targeted, automated, and integrated system for monitoring SCV operating load changes and managing and controlling SCR denitrification.

[0055] Therefore, this invention proposes a control method for the SCR denitrification system of the tail gas of an SCV vaporizer.

[0056] Figure 1 A schematic flowchart of a control method for an SCR denitrification system of an SCV vaporizer tail gas according to an embodiment of the present invention is shown.

[0057] In this embodiment, the SCR denitrification system is coupled to the SCV vaporizer. The SCV vaporizer is at the front end, and the SCR denitrification system is at the rear end. The exhaust gas discharged from the SCV vaporizer enters the SCR denitrification system for treatment. The SCV vaporizer generally includes components such as a burner and a blower. The SCR denitrification system generally includes components such as a gas-fired heater, a main exhaust fan, and a reaction chamber equipped with a denitrification catalyst. The main exhaust fan is used to exhaust the exhaust gas discharged from the SCV vaporizer and drive the exhaust gas to overcome the resistance of the SCR system and flow through the entire system. The gas-fired heater is used to heat the exhaust gas to a suitable operating temperature for the denitrification catalyst. The heated exhaust gas enters the reaction chamber and reacts with the injected reducing agent under the action of the denitrification catalyst to achieve the purpose of denitrification. The structures of the SCV vaporizer and the SCR denitrification system should be known to those skilled in the art, and will not be described in detail herein in order not to obscure the focus of the present invention.

[0058] See Figure 1 As shown, the control method of the tail gas SCR denitrification system of the SCV vaporizer of the present invention may include at least the following steps S102 to S106.

[0059] Step S102: Collect characteristic parameters related to the load of the SCV vaporizer.

[0060] Step S104: Abnormal data in the feature parameters are filtered out using an adaptive algorithm, and the feature parameters after filtering out abnormal data are used as the main load data of the SCV gasifier.

[0061] Step S106: Perform linkage control on the operating parameters of the SCR denitrification system based on the main unit load data of the SCV gasifier.

[0062] In the control method of the SCR denitrification system of the SCV gasifier tail gas in this embodiment of the invention, characteristic parameters related to the load of the SCV gasifier are collected as the main load data of the SCV gasifier, and the operating parameters of the SCR denitrification system are linked and controlled according to the main load data of the SCV gasifier, so that the SCR denitrification system can actively match and adapt to the load changes of the SCV gasifier.

[0063] Meanwhile, in the control method of the tail gas SCR denitrification system of the SCV gasifier in this embodiment of the invention, abnormal data is filtered out by an adaptive algorithm for the characteristic parameters of the SCV gasifier to obtain more accurate main load data of the SCV gasifier.

[0064] Adaptive algorithms can employ commonly used algorithms, such as the Least Mean Square (LMS) algorithm and the Kalman filter method.

[0065] In one specific embodiment, the adaptive algorithm can be a time difference filtering method. In a specific exemplary implementation, filtering out abnormal data in the characteristic parameters using time difference filtering can be implemented as follows: For each characteristic data point, the collected data is divided into short segments of a specified time. The median value of each segment is taken, and the medians of two adjacent segments are concatenated using a Gaussian filtering smoothing function algorithm to ensure consistent and smooth data output. The length of the specified time is adjustable and editable, for example, it can be set to 15 seconds. The smaller the time grid (i.e., the length of the specified time), the more sensitive the data response; the larger the time grid, the smoother the data fluctuations. This avoids frequent fluctuations in the characteristic parameter data of the SCV vaporizer due to instrumentation or transmission issues, which could induce fluctuations in the back-end control.

[0066] In some further embodiments, the characteristic parameters of the SCV vaporizer may include at least one of the following: blower frequency, burner flow rate or burner load, main unit temperature, exhaust temperature, exhaust pressure, etc. These characteristic parameters are obtained through multi-point acquisition; that is, different characteristic parameters are collected from different acquisition points of the SCV vaporizer. For each characteristic parameter, anomaly data filtering is performed. In this embodiment, by using an adaptive algorithm (specifically, a time difference filtering method) to filter out abnormal data from the different characteristic parameters of the SCV vaporizer collected from multiple points, the obtained main unit load data of the SCV vaporizer more accurately reflects the load status, reducing system load diagnosis errors caused by single-point data offsets.

[0067] After filtering out abnormal data and obtaining the main load data of the SCV gasifier, the operating parameters of the SCR denitrification system are controlled in a coordinated manner based on the main load data of the SCV gasifier according to a specific logic. Figure 2 A schematic diagram illustrating the logic of the linkage control of the SCR denitrification system operating parameters based on the main unit load data of the SCV gasifier in the control method of the tail gas SCR denitrification system according to another embodiment of the present invention is shown. The following will refer to... Figure 2 The specific logical steps of the linkage control are introduced.

[0068] In some embodiments, the characteristic parameters of the SCV vaporizer may include the blower frequency; correspondingly, the operating parameters of the SCR denitrification system may include the main exhaust fan frequency. Step S106 may include: when initially setting the main exhaust fan frequency of the SCR denitrification system, using a preset initial frequency matching coefficient between the main exhaust fan frequency and the blower frequency as the current frequency matching coefficient between the main exhaust fan frequency and the blower frequency, and determining and controlling the main exhaust fan frequency based on the blower frequency and the current frequency matching coefficient. The frequency matching coefficient between the main exhaust fan frequency and the blower frequency refers to the ratio of the main exhaust fan frequency to the blower frequency. Specifically, the product of the blower frequency and the current frequency matching coefficient is determined as the main exhaust fan frequency, and the main exhaust fan of the SCR denitrification system is controlled to operate at this determined main exhaust fan frequency.

[0069] The initial frequency matching coefficient can be set according to the actual operating requirements of the SCV vaporizer and SCR denitrification system. For example, the initial frequency matching coefficient can be set to 0.9, 1.0, 1.1, etc. In a preferred embodiment, the initial frequency matching coefficient can be set to 1.0, which means that the ratio of the initial matching main exhaust fan frequency to the blower frequency is 1:1, so as to effectively and timely exhaust the exhaust gas of the SCV vaporizer.

[0070] In some further embodiments, the characteristic parameters of the SCV vaporizer may also include exhaust pressure. Step S106 may also include:

[0071] Determine if the exhaust pressure is greater than the first pressure threshold.

[0072] If the exhaust pressure is greater than the first pressure threshold, the first frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the first preset relationship table and used as the current frequency matching coefficient. The first frequency matching coefficient is greater than the initial frequency matching coefficient.

[0073] If the exhaust pressure is less than or equal to the first pressure threshold, then determine whether the exhaust pressure is less than the second pressure threshold. If the second pressure threshold is less than the first pressure threshold, then the exhaust pressure is less than the second pressure threshold.

[0074] If the exhaust pressure is less than the second pressure threshold, the second frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the second preset relationship table as the current frequency matching coefficient. The second frequency matching coefficient is less than the initial frequency matching coefficient. The first preset relationship table and the second preset relationship table record the correspondence between different ranges of exhaust pressure and different frequency matching coefficients.

[0075] If the exhaust pressure is greater than or equal to the second pressure threshold, the current frequency matching coefficient is maintained.

[0076] The frequency of the main exhaust fan is determined and controlled based on the blower frequency and the current frequency matching system.

[0077] In other words, the frequency matching coefficient between the main exhaust fan and the blower frequency is also corrected based on the exhaust pressure of the SCV vaporizer. When the exhaust pressure is greater than the first pressure threshold, it indicates that the main exhaust fan's extraction capacity is insufficient. In this case, the frequency matching coefficient needs to be increased, thereby increasing the main exhaust fan frequency relative to the blower frequency to fully extract the exhaust gas from the SCV vaporizer. When the exhaust pressure is less than the second pressure threshold, it indicates that the main exhaust fan is over-extracting the exhaust gas. In this case, the frequency matching coefficient needs to be decreased, thereby decreasing the main exhaust fan frequency relative to the blower frequency to slow down the main exhaust fan's extraction speed and match it with the exhaust gas from the SCV vaporizer.

[0078] Of course, when correcting the frequency matching coefficient between the main exhaust fan frequency and the blower frequency based on the exhaust pressure of the SCV vaporizer in step S106, the exhaust pressure can be compared with the second pressure threshold first. If the exhaust pressure is less than the second pressure threshold, the second frequency matching coefficient can be found. If the exhaust pressure is greater than or equal to the second pressure threshold, the exhaust pressure can be compared with the first pressure threshold. If the exhaust pressure is greater than the first pressure threshold, the first frequency matching coefficient can be found. This will not affect the substance of the present invention.

[0079] The first and second pressure thresholds can be set according to the actual operating requirements of the SCV vaporizer and SCR denitrification system. In one specific embodiment, the first pressure threshold can be set to 100 Pa, and the second pressure threshold can be set to -50 Pa.

[0080] Taking an initial frequency matching coefficient of 1.0 as an example, the first preset relationship table can be shown in Table 1 below:

[0081] Table 1 First Preset Relationship Table

[0082] The second preset relationship table can be shown in Table 2 below:

[0083] Table 2 Second Preset Relationship Table

[0084]

[0085] During the search, the corresponding first frequency matching coefficient or second frequency matching coefficient is determined based on the pressure range into which the exhaust pressure falls.

[0086] In some embodiments, the blower frequency can be replaced by the opening degree of the blower duct valve. Correspondingly, the main exhaust fan frequency can also be replaced by the opening degree of the main exhaust fan duct valve. In this case, the opening degree matching coefficient can be used instead of the frequency matching coefficient. In this situation, the principle of linkage control of the main exhaust fan duct valve opening based on the blower duct valve opening, or the blower duct valve opening and exhaust pressure, is similar to the aforementioned principle of linkage control of the main exhaust fan frequency based on the blower frequency, or the blower frequency and exhaust pressure, and this does not affect the essence of the present invention.

[0087] In some embodiments, the characteristic parameters of the SCV vaporizer may include burner flow rate or burner load, and correspondingly, the operating parameters of the SCR denitrification system may include the gas-fired boiler load. Step S106 may include: determining and controlling the gas-fired boiler load based on a first preset linear function according to the burner flow rate or burner load, wherein the independent variable of the first preset linear function is the burner flow rate or burner load, the dependent variable is the gas-fired boiler load, the slope is greater than zero, and the first preset linear function is pre-calibrated through on-site testing of the SCV vaporizer and the SCR denitrification system.

[0088] When the burner flow rate (i.e., the flow rate of fuel such as natural gas in the burner) or the burner load increases or decreases, the amount of exhaust gas produced will also increase or decrease accordingly, thus increasing or decreasing the load demand on the gas-fired boiler. This invention embodiment uses a pre-calibrated first preset linear function with a slope greater than zero to perform linkage control between the burner flow rate or burner load and the gas-fired boiler load. This allows the gas-fired boiler load to change linearly in response to changes in the burner flow rate or burner load, ensuring that the heated exhaust gas reaches the reaction temperature required for SCR, thereby guaranteeing reaction efficiency.

[0089] In some embodiments, the characteristic parameters of the SCV vaporizer may include burner flow rate or burner load, and correspondingly, the operating parameters of the SCR denitrification system may include reductant injection flow rate. Step S106 may include: determining and controlling the reductant injection flow rate based on a second preset linear function according to the burner flow rate or burner load, wherein the independent variable of the second preset linear function is the burner flow rate or burner load, the dependent variable is the reductant injection flow rate, the slope is greater than zero, and the second preset linear function is pre-calibrated through on-site testing of the SCV vaporizer and the SCR denitrification system.

[0090] The reducing agent can be any reducing agent applicable to the SCR denitration reaction, such as urea solution, aqueous ammonia solution, liquid ammonia, etc. The more tail gas generated by the SCV vaporizer, the more reducing agent required for the SCR denitration reaction. Of course, the demand for the injection amount of the reducing agent is also related to the utilization efficiency of the reducing agent, which can also be reflected in the second preset linear function pre-calibrated through on-site testing. The embodiment of the present invention performs the interlock control of the burner flow rate or burner load and the injection flow rate of the reducing agent based on the second preset linear function with a slope greater than zero pre-calibrated, so that the injection flow rate of the reducing agent can linearly change in linkage with the change of the burner flow rate or burner load, which can ensure the NO in the tail gas to a certain extent x fully react, and avoid secondary pollution of the tail gas caused by excessive injection of the reducing agent and unreasonable consumption of the reducing agent.

[0091] In some further embodiments, the operating parameters of the SCR denitration system may further include the compressed air pressure. Step S106 may include: determining and controlling the compressed air pressure based on a third preset linear function according to the determined injection flow rate of the reducing agent, where the independent variable of the third preset linear function is the injection flow rate of the reducing agent, the dependent variable is the compressed air pressure, the slope is less than zero, and the third preset linear function is pre-calibrated through on-site testing of the SCR denitration system.

[0092] During the SCR reaction, compressed air can be used to atomize the reducing agent and then inject it into the reaction chamber, so that the reducing agent can fully contact the tail gas for reaction. Generally speaking, the smaller the injection flow rate of the reducing agent, the greater the compressed air pressure required for full atomization. The embodiment of the present invention performs the interlock control of the injection flow rate of the reducing agent and the compressed air pressure based on the third preset linear function with a slope less than zero pre-calibrated, so that the compressed air pressure linearly changes in the reverse direction following the change of the injection flow rate of the reducing agent, making the injected reducing agent fully atomized, thereby ensuring the reaction efficiency.

[0093] In some other embodiments, refer to Figure 2 , the characteristic parameters of the SCV vaporizer may further include the main engine temperature and / or the exhaust temperature. Correspondingly, in addition to the interlock control of the burner flow rate or burner load and the load of the gas heating furnace, step S106 may further include: monitoring the changes in the main engine temperature and / or the exhaust temperature, and adjusting the load of the gas heating furnace according to the changes in the main engine temperature and / or the exhaust temperature.

[0094] The load of the gas heating furnace required to heat the tail gas to the reaction temperature is not only related to the amount of the tail gas, but also related to the temperature of the tail gas at the inlet of the gas heating furnace. Since the exhaust temperature of the SCV vaporizer can directly reflect the temperature of the tail gas at the inlet of the gas heating furnace, adjusting the load of the gas heating furnace in real time according to the change of the exhaust temperature can ensure the heating effect of the tail gas, thereby ensuring the reaction efficiency.

[0095] The main unit temperature of an SCV vaporizer refers to the combustion chamber temperature, which affects the exhaust temperature. Generally, a rise or fall in the main unit temperature indicates a corresponding rise or fall in the exhaust temperature. However, parameter detection, logic operations, signal transmission, and control operations all require a certain response time. Adjusting the gas heater load based on exhaust temperature has a certain lag, especially when the exhaust gas flow velocity is high. This lag may prevent timely adjustment of the gas heater load to heat the already changed exhaust gas to the required reaction temperature. Since changes in the main unit temperature can predict corresponding changes in exhaust temperature, monitoring these changes and adjusting the gas heater load accordingly can largely avoid this lag, allowing for timely load adjustments and ensuring effective exhaust gas heating.

[0096] In some further embodiments, step S106 may also include: periodically acquiring the outlet temperature of the gas-fired heater, calculating the difference between the outlet temperature and the target temperature, and if the difference is greater than the upper limit of the preset fluctuation range, reducing the load of the gas-fired heater by a preset step size; if the difference is less than the lower limit of the preset fluctuation range, increasing the load of the gas-fired heater by a preset step size until the difference is within the preset fluctuation range.

[0097] The outlet temperature of the gas-fired heater represents the actual temperature of the exhaust gas after heating, while the target temperature is the desired temperature of the heated exhaust gas. When the difference between the outlet temperature and the target temperature exceeds the upper limit of the preset fluctuation range, it indicates that the heated exhaust gas temperature is already higher than the upper limit of the allowable temperature fluctuation range, exceeding the reaction temperature required by SCR. In this case, the load on the gas-fired heater needs to be gradually reduced, i.e., a negative correction is applied to the gas-fired heater load. When the difference between the outlet temperature and the target temperature is less than the lower limit of the preset fluctuation range, it indicates that the heated exhaust gas temperature is already lower than the lower limit of the allowable temperature fluctuation range, exceeding the reaction temperature required by SCR. In this case, the load on the gas-fired heater needs to be gradually increased, i.e., a positive correction is applied to the gas-fired heater load. The preset fluctuation range can be set according to actual needs, for example, it can be set to [-2℃, +2℃]. Through this feedback control, the heating effect of the exhaust gas can be further guaranteed, thereby further ensuring the reaction efficiency.

[0098] In the control method of the SCV gasifier tail gas SCR denitrification system in the aforementioned embodiments of the present invention, the main key characteristic parameters of the SCV gasifier operation, such as blower frequency, burner flow or load, main unit temperature, exhaust temperature, and exhaust pressure, are collected. This method can comprehensively reflect the subtle changes in the operating load of the SCV gasifier. Then, based on specific logic, the operating parameters of the SCR denitrification system, such as the gas furnace load, main exhaust fan frequency, reducing agent injection flow, and compressed air pressure, are linked and controlled to accurately control the operation of the SCR denitrification system and avoid the waste of energy (such as electricity) and materials (such as natural gas, denitrification reducing agent, water, compressed air, etc.) caused by extensive management.

[0099] In some embodiments, different priority levels can be set for the various characteristic parameters of the SCV vaporizer described above. During the control process, abnormal data is screened out for each characteristic parameter according to its priority level, and linkage control is performed with the operating parameters of the SCR denitrification system. In this way, the simultaneous computational load of the system can be reduced, and the normal and smooth operation of the linkage control can still be guaranteed even if some characteristic parameters become unusable due to abnormality or the computational load of all characteristic parameters is too large.

[0100] It should be noted that all the aforementioned load and flow regulation controls can be replaced by adjusting the valve opening of the corresponding equipment, which will not affect the essence of the present invention.

[0101] Based on the same inventive concept, embodiments of the present invention also provide an electronic device 20. See also Figure 3 As shown, the electronic device 20 includes a memory 21, a processor 22, and a machine-executable program 23 stored in the memory 21 and running on the processor 22. When the processor 22 executes the machine-executable program 23, it implements a control method for the tail gas SCR denitrification system of the SCV vaporizer of any of the foregoing embodiments or combinations of embodiments.

[0102] Optionally, the processor 22 may be a programmable logic controller (PLC), a distributed control system (DCS), or the like.

[0103] The present invention can bring the following beneficial effects:

[0104] (1) The control method of this invention accurately grasps the changes in SCV operating load, providing key information for downstream SCR denitrification, ensuring stable operation of the denitrification unit and reducing NO emissions from SCV tail gas. x The data stability meets the standards, providing sufficient conditions.

[0105] (2) It can precisely control the operation of the SCR denitrification system, avoid the waste of energy and materials caused by extensive management, and achieve significant economic benefits.

[0106] (3) It can precisely control the operation of the SCR denitrification system, avoid excessive injection of denitrification reducing agent (such as urea solution, ammonia solution, liquid ammonia) due to extensive management, which would cause the NH3 emission of SCV tail gas to exceed the standard and cause secondary environmental pollution, and has significant environmental protection value.

[0107] Those skilled in the art will clearly understand that the specific working process of the systems, devices and units described above can be referred to the corresponding process in the foregoing method embodiments, and for the sake of brevity, it will not be repeated here.

[0108] Furthermore, the functional units in the various embodiments of the present invention can be physically independent of each other, or two or more functional units can be integrated together, or all functional units can be integrated into one processing unit. The integrated functional units described above can be implemented in hardware, or in software or firmware.

[0109] Those skilled in the art will understand that if the integrated functional unit is implemented in software and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or all or part of it, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computing device (e.g., a personal computer, server, or network device) to execute all or part of the steps of the methods described in the embodiments of the present invention when running the instructions. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0110] Alternatively, all or part of the steps of the foregoing method embodiments can be implemented by hardware (such as a computing device, personal computer, server, or network device) related to program instructions. The program instructions can be stored in a computer-readable storage medium. When the program instructions are executed by the processor of the computing device, the computing device executes all or part of the steps of the methods described in the various embodiments of the present invention.

[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 the foregoing embodiments, those skilled in the art should understand that within the spirit and principles of the present invention, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the corresponding technical solutions to depart from the protection scope of the present invention.

Claims

1. A control method for an SCR denitrification system of an SCV vaporizer tail gas, wherein the SCR denitrification system is coupled to the SCV vaporizer and is used to treat the tail gas of the SCV vaporizer, characterized in that, The control method includes: Collect characteristic parameters related to the load of the SCV vaporizer; Abnormal data in the feature parameters are filtered out using an adaptive algorithm, and the feature parameters after filtering out abnormal data are used as the main load data of the SCV gasifier. The operating parameters of the SCR denitrification system are controlled in a coordinated manner based on the main unit load data of the SCV gasifier. The characteristic parameters include burner flow rate or burner load, and the operating parameters include gas-fired furnace load. The step of linking and controlling the operating parameters of the SCR denitrification system based on the main unit load data of the SCV vaporizer includes: The load of the gas-fired heating furnace is determined and controlled based on the burner flow rate or burner load, using a first preset linear function. The independent variable of the first preset linear function is the burner flow rate or burner load, the dependent variable is the gas-fired heating furnace load, the slope is greater than zero, and the first preset linear function is pre-calibrated through on-site testing of the SCV gasifier and the SCR denitrification system. The operating parameters also include the reducing agent injection flow rate; The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes: The reducing agent injection flow rate is determined and controlled based on the burner flow rate or burner load using a second preset linear function. The independent variable of the second preset linear function is the burner flow rate or burner load, the dependent variable is the reducing agent injection flow rate, the slope is greater than zero, and the second preset linear function is pre-calibrated through on-site testing of the SCV vaporizer and the SCR denitrification system. The operating parameters also include compressed air pressure; The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes: Based on the determined reducing agent injection flow rate, the compressed air pressure is determined and controlled based on a third preset linear function, wherein the independent variable of the third preset linear function is the reducing agent injection flow rate, the dependent variable is the compressed air pressure, the slope is less than zero, and the third preset linear function is pre-calibrated through on-site testing of the SCR denitrification system.

2. The control method for the tail gas SCR denitrification system of the SCV vaporizer according to claim 1, characterized in that, The adaptive algorithm is a time difference filtering method.

3. The control method for the tail gas SCR denitrification system of the SCV vaporizer according to claim 1, characterized in that, The characteristic parameters include the blower frequency, and the operating parameters include the main exhaust fan frequency; The step of linking and controlling the operating parameters of the SCR denitrification system based on the main unit load data of the SCV vaporizer includes: When initially setting the frequency of the main exhaust fan of the SCR denitrification system, the initial frequency matching coefficient between the preset main exhaust fan frequency and the blower frequency is used as the current frequency matching coefficient between the main exhaust fan frequency and the blower frequency. The main exhaust fan frequency is determined and controlled based on the blower frequency and the current frequency matching coefficient.

4. The control method for the tail gas SCR denitrification system of the SCV vaporizer according to claim 3, characterized in that, The characteristic parameters also include exhaust pressure; The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes: Determine whether the exhaust pressure is greater than the first pressure threshold; If the exhaust pressure is greater than the first pressure threshold, then the first frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the first preset relationship table as the current frequency matching coefficient, and the first frequency matching coefficient is greater than the initial frequency matching coefficient. If the exhaust pressure is less than or equal to the first pressure threshold, then determine whether the exhaust pressure is less than the second pressure threshold, wherein the second pressure threshold is less than the first pressure threshold; If the exhaust pressure is less than the second pressure threshold, then the second frequency matching coefficient corresponding to the exhaust pressure is determined by looking up the second preset relationship table as the current frequency matching coefficient. The second frequency matching coefficient is less than the initial frequency matching coefficient. The first preset relationship table and the second preset relationship table record the correspondence between different ranges of exhaust pressure and different frequency matching coefficients. If the exhaust pressure is greater than or equal to the second pressure threshold, then the current frequency matching coefficient is maintained; The frequency of the main exhaust fan is determined and controlled based on the blower frequency and the current frequency matching system.

5. The control method for the tail gas SCR denitrification system of the SCV vaporizer according to claim 1, characterized in that, The characteristic parameters also include host temperature and / or exhaust temperature; The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes: Monitor changes in the main unit temperature and / or exhaust temperature, and adjust the load of the gas-fired heating furnace according to the changes in the main unit temperature and / or exhaust temperature.

6. The control method for the tail gas SCR denitrification system of the SCV vaporizer according to claim 1 or 5, characterized in that, The step of linking the operating parameters of the SCR denitrification system with the main unit load data of the SCV gasifier also includes: The outlet temperature of the gas-fired heater is periodically acquired, and the difference between the outlet temperature and the target temperature is calculated. If the difference is greater than the upper limit of the preset fluctuation range, the load of the gas-fired heater is reduced by a preset step size. If the difference is less than the lower limit of the preset fluctuation range, the load of the gas-fired heater is increased by a preset step size until the difference is within the preset fluctuation range.

7. An electronic device comprising a memory, a processor, and a machine-executable program stored in the memory and running on the processor, wherein the processor, when executing the machine-executable program, implements a control method for a tail gas SCR denitrification system of an SCV vaporizer according to any one of claims 1-6.

Images