Temperature control method, device and equipment for denitration equipment and medium

Abstract

The invention discloses a temperature control method, device and equipment of denitration equipment and a medium, and relates to the technical field of tail gas purification, and the temperature control method comprises the steps that tail gas parameters input into the denitration equipment are collected, and the tail gas parameters comprise the tail gas inlet temperature, the tail gas mass flow and the environment temperature; on the basis of the tail gas inlet temperature and the tail gas mass flow in the tail gas parameters, tail gas heat input into the denitration equipment is calculated; the total heat loss amount of the denitration equipment in the denitration operation process is calculated; calculating the predicted temperature of the denitration equipment through a preset temperature prediction model based on the tail gas heat and the total heat loss amount; comparing the predicted temperature with a preset reaction temperature threshold value to obtain a temperature deviation; and if the temperature deviation meets a preset heating condition, controlling a heater to start according to the temperature deviation so as to heat before the temperature of the denitration equipment is reduced to a preset reaction temperature threshold value. Once the model predicts that the equipment temperature is about to drop below the optimal reaction temperature, heating control logic is triggered immediately, and advanced heating is achieved.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas purification technology, and in particular to a temperature control method, device, equipment and medium for denitrification equipment. Background Technology

[0002] When removing nitrogen oxides (NOx) from engine exhaust using an engine test bench or a stationary power source, a denitrification device is required. The denitrification device works by reacting NOx with ammonia produced from urea hydrolysis, using a catalyst to generate nitrogen, carbon dioxide, and water. To ensure high NOx conversion efficiency, the denitrification device needs a heater. Current technology involves the heater starting when the denitrification device temperature is low, heating the flowing gas to raise the device temperature; the heater stops working when the temperature is high. The problem with this technology is that restarting the heater to raise the device temperature takes a long time, during which NOx conversion efficiency is low, potentially leading to NOx emissions failing to meet regulations. For special projects requiring constant emission compliance, current technology is insufficient. Summary of the Invention

[0003] In view of this, the purpose of this invention is to provide a temperature control method, apparatus, device, and medium for denitrification equipment, which can pre-start the heater before the temperature of the denitrification equipment drops, thereby improving the working efficiency of the denitrification equipment. The specific solution is as follows: In a first aspect, this application discloses a temperature control method for a denitrification device, comprising: Collect and input the exhaust gas parameters of the denitrification equipment, including exhaust gas inlet temperature, exhaust gas mass flow rate and ambient temperature; The heat of the exhaust gas used to input the denitrification equipment is calculated based on the exhaust gas inlet temperature and the exhaust gas mass flow rate in the exhaust gas parameters. Calculate the total heat loss of the denitrification equipment during denitrification operation; The predicted temperature of the denitrification equipment is calculated by using a preset temperature prediction model and based on the heat of the exhaust gas and the total heat loss. The predicted temperature is compared with a preset reaction temperature threshold to obtain the temperature deviation; If the temperature deviation meets the preset heating conditions, the heater is started according to the temperature deviation to heat the equipment before the temperature drops to the preset reaction temperature threshold.

[0004] Optionally, calculating the total heat loss of the denitrification equipment during denitrification operation includes: Calculate the first heat loss due to heat conduction during the denitrification operation of the denitrification equipment; Calculate the second heat loss amount of the denitrification equipment during denitrification operation based on the ambient temperature; The total heat loss is obtained by summing the heat loss of the first heat loss and the heat loss of the second heat loss.

[0005] Optionally, calculating the first heat loss due to heat conduction during the denitrification operation of the denitrification equipment includes: The first heat loss is calculated based on thermal conductivity, thermal conductivity area, temperature difference between the two sides of the denitrification equipment wall, and equipment material thickness.

[0006] Optionally, the calculation of the second heat loss amount based on the ambient temperature during the denitrification operation of the denitrification equipment includes: The second heat loss is calculated based on surface emissivity, radiative surface area, absolute temperature of the outer wall of the denitrification equipment, and ambient temperature.

[0007] Optionally, the step of calculating the predicted temperature of the denitrification equipment using a preset temperature prediction model and based on the exhaust gas heat and the total heat loss includes: The net input heat of the denitrification equipment is obtained by subtracting the total heat loss from the heat of the exhaust gas using a preset temperature prediction model. The predicted temperature is calculated and output using the preset temperature prediction model and based on the net input heat and the heat capacity of the denitrification equipment.

[0008] Optionally, the preset heating conditions include state conditions and time conditions, wherein, The state condition is that the temperature deviation exceeds a preset temperature difference threshold and the engine is in operation. The time condition is that the temperature deviation exceeds the preset temperature difference threshold for a first time exceeding the first time threshold, and the engine is in operation for a second time exceeding the second time threshold.

[0009] Optionally, controlling the heater to start based on the temperature deviation to heat the equipment before the temperature drops to the preset reaction temperature threshold includes: Based on the temperature deviation and the heat capacity of the denitrification equipment, calculate the target heating heat required to control the denitrification equipment to reach the preset reaction temperature threshold. The heating time of the heater is calculated based on the target heating heat, the power of the heater, and the heating efficiency. The heater is controlled to perform heating operations according to the heating time.

[0010] Secondly, this application discloses a temperature control device for a denitrification equipment, comprising: The parameter acquisition module is used to collect the exhaust gas parameters input to the denitrification equipment, including exhaust gas inlet temperature, exhaust gas mass flow rate and ambient temperature. The exhaust gas heat calculation module is used to calculate the exhaust gas heat input to the denitrification equipment based on the exhaust gas inlet temperature and the exhaust gas mass flow rate in the exhaust gas parameters. The heat loss calculation module is used to calculate the total heat loss of the denitrification equipment during the denitrification operation process; The temperature prediction module is used to calculate the predicted temperature of the denitrification equipment based on the heat of the exhaust gas and the total heat loss by using a preset temperature prediction model. The deviation acquisition module is used to compare the predicted temperature with a preset reaction temperature threshold to obtain the temperature deviation; The preheating module is used to control the heater to start according to the temperature deviation if the temperature deviation meets the preset heating conditions, so as to heat the equipment before the temperature drops to the preset reaction temperature threshold.

[0011] Thirdly, this application discloses an electronic device, including: Memory, used to store computer programs; A processor is used to execute the computer program to implement the steps of the temperature control method for the aforementioned disclosed denitrification equipment.

[0012] Fourthly, this application discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, it implements the steps of the aforementioned temperature control method for the denitrification equipment.

[0013] As can be seen, the present invention provides a method for collecting and inputting exhaust gas parameters of a denitrification device, including exhaust gas inlet temperature, exhaust gas mass flow rate, and ambient temperature; calculating the exhaust gas heat input to the denitrification device based on the exhaust gas inlet temperature and exhaust gas mass flow rate; calculating the total heat loss of the denitrification device during denitrification operation; calculating the predicted temperature of the denitrification device using a preset temperature prediction model and based on the exhaust gas heat and the total heat loss; comparing the predicted temperature with a preset reaction temperature threshold to obtain a temperature deviation; and if the temperature deviation meets preset heating conditions, controlling the heater to start according to the temperature deviation to heat the denitrification device before its temperature drops to the preset reaction temperature threshold. Therefore, by collecting the exhaust gas inlet temperature and exhaust gas mass flow rate, the energy flow about to enter the denitrification equipment is reflected. This allows for the earlier detection of trends leading to temperature changes compared to simply measuring the current temperature inside or at the outlet of the equipment. By calculating the exhaust gas heat and heat loss, the temperature state that the denitrification equipment will reach is further predicted. The predicted temperature is compared with the threshold. Once the model predicts that the equipment temperature will drop below the optimal reaction temperature, the heating control logic is immediately triggered to achieve preheating. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1 This is a flowchart of a temperature control method for a denitrification device disclosed in this application; Figure 2 This is a schematic diagram of the temperature control system structure of a denitrification device disclosed in this application; Figure 3 This is the overall logic diagram for temperature control of a denitrification device disclosed in this application; Figure 4 This is a diagram illustrating the exhaust gas input heat calculation strategy for a denitrification device disclosed in this application; Figure 5 This is a diagram illustrating a heat loss calculation strategy for a denitrification device disclosed in this application; Figure 6 This is a control logic diagram of a heater status switch for a denitrification device disclosed in this application; Figure 7 This is a control logic diagram of a heater in a denitrification device disclosed in this application; Figure 8This is a schematic diagram of the temperature control device of a denitrification equipment disclosed in this application; Figure 9 This is a structural diagram of an electronic device disclosed in this application. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0017] When removing nitrogen oxides (NOx) from engine exhaust using an engine test bench or a stationary power source, a denitrification device is required. The denitrification device works by reacting NOx with ammonia produced from urea hydrolysis, using a catalyst to generate nitrogen, carbon dioxide, and water. To ensure high NOx conversion efficiency, the denitrification device needs a heater. Current technology involves the heater starting when the denitrification device temperature is low, heating the flowing gas to raise the device temperature; the heater stops working when the temperature is high. The problem with this technology is that restarting the heater to raise the device temperature takes a long time, during which NOx conversion efficiency is low, potentially leading to NOx emissions failing to meet regulations. For special projects requiring constant emission compliance, current technology is insufficient.

[0018] Therefore, the present invention provides a temperature control scheme for denitrification equipment, which can pre-start the heater before the temperature of the denitrification equipment drops, so as to improve the working efficiency of the denitrification equipment.

[0019] like Figure 1 As shown, the present invention provides a temperature control method for a denitrification device, comprising: Step S11: Collect the exhaust gas parameters of the input denitrification equipment, including exhaust gas inlet temperature, exhaust gas mass flow rate and ambient temperature.

[0020] In this embodiment, various exhaust gas parameters of the denitrification equipment reactor are collected by temperature sensors and flow sensors installed on the denitrification equipment. Among these parameters, the following are utilized: Figure 2 The system shown uses temperature and flow sensors to collect exhaust gas parameters. Specifically, Figure 2The various symbols in the system represent the following components or units: Engine 1: Pollution source, generating exhaust gas that needs to be treated; Heater 2: An actuator used to heat the exhaust gas flowing through the denitrification equipment, increasing its temperature; Upstream NOx sensor 3: Installed before the reactor inlet of the denitrification equipment, used to monitor the concentration of nitrogen oxides in the engine exhaust; Upstream temperature sensor 4: Installed before the reactor inlet of the denitrification equipment, used to monitor the temperature of the exhaust gas entering the reactor; Denitrification equipment reactor 5 (catalyst) is the core processing unit, containing a catalyst where NOx and N2 react. The reduction reaction occurs; downstream temperature sensor 6 is installed after the reactor outlet of the denitrification equipment to monitor the temperature of the treated exhaust gas. Downstream NOx sensor 7 is installed after the reactor outlet of the denitrification equipment to monitor the final emission concentration of nitrogen oxides, achieving closed-loop control. ECU (Electronic Control Unit) control unit 8 is the main controller of the system, responsible for collecting engine operating conditions and signals from various sensors (such as 3, 4, 6, and 7), and performing comprehensive calculations and decisions; heater controller 9 is a dedicated controller that receives instructions from ECU control unit 8 and specifically executes the start / stop and timing control of heater 2. Therefore, when exhaust gas is discharged from engine 1, it flows sequentially through upstream NOx sensor 3 and upstream temperature sensor 4. At this time, upstream NOx sensor 3 and upstream temperature sensor 4 respectively collect the corresponding upstream exhaust gas mass flow rate and upstream exhaust gas inlet temperature. In addition, an ambient temperature sensor is installed on the outer wall of the denitrification equipment reactor, away from heat sources, to collect ambient temperature. Based on the collected information (exhaust gas mass flow rate, exhaust gas inlet temperature, and ambient temperature), the heat dissipation calculation module calculates the heat loss of the denitrification equipment due to heat conduction and radiation according to the heat transfer equation. The denitrification equipment temperature calculation module calculates the net input heat in the denitrification equipment through the heat balance equation and converts it into a temperature value for comparison with the set temperature. The heater control module calculates the theoretical heat required to reach the set temperature based on the feedforward temperature deviation, calculates the actual heating time of the heater considering the influence of heater operating efficiency, and transmits the heating time to the heater to achieve final control.

[0021] in, Figure 2The specific process for temperature control in the denitrification device is as follows: The engine control unit (ECU) collects various information about engine emissions through various sensors, such as exhaust gas flow rate, ambient temperature, exhaust temperature, and nitrogen oxide concentration. When the engine exhaust gas passes through the upstream temperature sensor, the sensor receives the signal, converts it into an electrical signal, and transmits it to the ECU. The ECU then transmits the signal to the heater controller of the denitrification equipment. The heater controller calculates the heat of the incoming exhaust gas and the heat dissipation of the denitrification equipment based on its built-in temperature calculation logic, predicts the temperature changes of the denitrification equipment in real time, and adjusts the heater heating time according to the feedback signal to maintain the temperature inside the denitrification equipment within the optimal range, ensuring that the nitrogen oxide (NOx) emission level in the exhaust gas always meets the standards.

[0022] In this way, the temperature changes of the denitrification equipment can be monitored in real time. When the temperature of the denitrification equipment is detected to be below the optimal temperature for NOx reaction, the heater control module will adjust the heater heating time in a timely manner according to the temperature difference to ensure that the denitrification equipment is at the most efficient reaction temperature.

[0023] Furthermore, such as Figure 3 The diagram shows the overall temperature control logic framework, including calculations for incoming exhaust gas heat, heat loss in the denitrification equipment, and heater output heat. These modules work together to calculate the final heater operating time, thus achieving the goal of controlling the internal temperature of the denitrification equipment. The net system input heat (heater not operating) is obtained by subtracting heat loss from the exhaust gas input heat. The current internal temperature of the denitrification equipment is calculated using its heat capacity and upstream temperature. This difference is then compared to the set optimal reaction temperature of the denitrification equipment, and finally, this temperature deviation is input into the heater output heat calculation to determine the heater's operating time.

[0024] Step S12: Calculate the heat of the exhaust gas used to input the denitrification equipment based on the exhaust gas inlet temperature and the exhaust gas mass flow rate in the exhaust gas parameters.

[0025] like Figure 4 The diagram shows the detailed logic framework for calculating the heat of the incoming exhaust gas. Temperature sensors input the measured upstream and downstream temperatures of the denitrification equipment into the calculation unit, based on Q=m Cp The principle of ΔT is as follows: Cp represents the specific heat capacity of the exhaust gas at constant pressure, and ΔT represents the temperature difference between the upstream temperature and the downstream temperature of the denitrification equipment. Since the mass m at this time is composed of the mass flow rate of the exhaust gas, the integrator converts the calculated value into the heat input of the exhaust gas, that is, the heat of the exhaust gas used to input the denitrification equipment. When the denitrification temperature control-heat reset calibration signal is activated, that is, when the calibration signal is set to logic true, the integrator outputs the corresponding set value in the reset state.

[0026] Step S13: Calculate the total heat loss of the denitrification equipment during the denitrification operation.

[0027] In this embodiment, as Figure 5 As shown, the first heat loss due to heat conduction during the denitrification process is calculated; the second heat loss due to heat radiation during the denitrification process is calculated based on the ambient temperature; and the total heat loss is obtained by summing the first and second heat losses. Specifically, the first heat loss is calculated based on thermal conductivity, thermally conductive area, temperature difference between the two sides of the denitrification equipment wall, and the thickness of the equipment material. The second heat loss is calculated based on surface emissivity, radiative surface area, the absolute temperature of the outer wall of the denitrification equipment, and the ambient temperature. It is understood that actual temperature calculations need to consider heat loss due to heat dissipation; therefore, the addition of a heat loss calculation unit makes the temperature prediction more consistent with reality. Currently, the heat losses considered mainly include heat conduction and heat radiation, i.e., the first and second heat losses.

[0028] The formula for calculating the first heat loss is as follows: ; in, This represents the first heat loss. Indicates thermal conductivity, This refers to the thermal conductivity area, which is the surface area of ​​the reactor wall, measured in m². 2 , This represents the temperature difference across the material, expressed in Kelvin (K). This indicates the thickness of the material, expressed in meters (m).

[0029] The formula for calculating the second heat loss is as follows: ; in, This indicates the second heat loss. Indicates emissivity, This represents the Stefan-Boltzmann constant. , The surface area represents the radiative surface area, which is the surface area of ​​the outer wall of the reactor, in meters (m²). 2 , It represents the absolute temperature of an object's surface. It indicates the absolute temperature of the surrounding environment.

[0030] The calculated first and second heat losses are summed to obtain the total heat loss of the denitrification equipment during denitrification operation.

[0031] Step S14: Calculate the predicted temperature of the denitrification equipment using a preset temperature prediction model and based on the exhaust gas heat and the total heat loss.

[0032] In this embodiment, the net input heat of the denitrification equipment is obtained by subtracting the total heat loss from the exhaust gas heat using a preset temperature prediction model. The predicted temperature is then calculated and output based on the net input heat and the heat capacity of the denitrification equipment using the preset temperature prediction model. It is understood that the model receives the exhaust gas input heat (exhaust gas heat) and the total heat loss of the equipment from the aforementioned calculation module. The exhaust gas input heat represents the heat energy released to the equipment during the flow of exhaust gas through the reactor; the total heat loss includes the heat energy lost to the environment through heat conduction and radiation. The model calculates the difference between the two, i.e., it performs the calculation of the net input heat. This net input heat directly reflects the effective net energy value used to change the thermodynamic state (increase or decrease the temperature) of the denitrification equipment itself within a certain instant or a small time period. If the result is positive, it indicates that the equipment is in a heat absorption and heating trend; if it is negative, it indicates that the equipment is in a heat dissipation and cooling trend. After obtaining the net input heat, the model converts it into a predicted value for the temperature of the denitrification equipment itself according to the definition of heat capacity in physics. Specifically, the temperature change of the denitrification equipment, as a physical entity with a corresponding target heat capacity, is directly proportional to the net heat absorbed, with the relationship being: Temperature Change = Net Heat / Target Heat Capacity. Based on this relationship, calculations are performed by dividing the calculated net input heat by the heat capacity of the denitrification equipment to obtain the predicted temperature change of the equipment in the next control cycle. This predicted temperature change is then added to the equipment's current reference temperature (the previous predicted value or a corrected estimate) to finally calculate and output the predicted temperature of the denitrification equipment at future times.

[0033] In this way, by taking into account both energy input and loss, the intermediate variable of heat is mapped to the target temperature value, providing an advanced basis for the feedforward control decision and ensuring that the heater can be triggered in a timely and accurate manner to maintain the optimal reaction temperature window.

[0034] Step S15: Compare the predicted temperature with the preset reaction temperature threshold to obtain the temperature deviation.

[0035] In this embodiment, the predicted temperature calculated and output by the temperature prediction module in real time is sent to the comparison unit of the controller. Simultaneously, the controller stores a preset reaction temperature threshold. This threshold is a calibrated target temperature value or the median of the target range that corresponds to the optimal temperature target value for maintaining the highest nitrogen oxide (NOx) conversion efficiency of the catalyst in the denitrification equipment. The specific value is determined comprehensively based on the characteristics of the catalyst, typical engine operating conditions, and emission regulations. Temperature deviation = Predicted temperature - Preset reaction temperature threshold.

[0036] Step S16: If the temperature deviation meets the preset heating conditions, the heater is started according to the temperature deviation to heat the equipment before the temperature drops to the preset reaction temperature threshold.

[0037] In this embodiment, the preset heating conditions include state conditions and time conditions. The state condition is that the temperature deviation exceeds a preset temperature difference threshold and the engine is running. The time condition is that the temperature deviation exceeds the preset temperature difference threshold for a first time exceeding a first time threshold, and the engine is running for a second time exceeding a second time threshold. It is understood that the calculated temperature deviation must exceed the preset temperature difference threshold. This threshold defines the minimum temperature deviation that the system deems necessary to initiate heating intervention, ensuring that heating is only considered when the predicted temperature is lower than the target temperature, avoiding unnecessary responses to minor fluctuations. Similarly, the engine must be determined to be running. This condition ensures that heating occurs only during actual operation when the engine is emitting exhaust gases and there is actual exhaust gas that needs to be treated. When the engine is off or in standby mode, even if the model predicts a low temperature, heating will not be initiated, thereby saving energy and ensuring safety. Based on the satisfied state conditions, a debouncing or delayed confirmation logic is introduced, requiring that both of the aforementioned state conditions (temperature deviation exceeding the threshold and engine running) be simultaneously met and persist for a stable period. This duration must exceed a preset time threshold. The system continuously monitors these two states. Only when both excessively low temperature and engine operation occur simultaneously, and this coexistence remains stable for more than a time threshold, will the control system ultimately determine that the preset heating conditions are fully met. This delayed confirmation mechanism effectively filters out brief jumps in temperature and status signals caused by engine start-up, rapid switching of operating conditions, or other interference, ensuring that the heater start command is accurate and necessary.

[0038] like Figure 6 As shown, when the deviation temperature is greater than the preset temperature difference threshold, that is, the temperature of the denitrification equipment is lower than the target value; the engine is running, and both need to be maintained for a time exceeding the corresponding time threshold, the heater is in the energized state when both of the above conditions are met simultaneously.

[0039] In this embodiment, based on the temperature deviation and the heat capacity of the denitrification equipment, the target heating heat required to control the denitrification equipment to reach the preset reaction temperature threshold is calculated; the heating time of the heater is calculated according to the target heating heat, the power of the heater, and the heating efficiency; and the heater is controlled to perform heating operation according to the heating time. It can be understood that the controller uses the temperature deviation, i.e., the negative difference between the predicted temperature and the target temperature, as the basic input for heating demand. According to thermodynamic principles, the energy required to compensate for this temperature deviation is equal to the heat absorbed by the denitrification equipment to raise the corresponding temperature. Therefore, the target heating heat is calculated as: target heating heat = temperature deviation × heat capacity of the denitrification equipment. Here, heat capacity is an inherent physical property of the denitrification equipment reactor body (including catalyst carrier, shell, etc.), representing the heat absorbed for every 1 degree Celsius increase in temperature. The temperature difference, the control target, is linearly converted into the energy value that needs to be replenished to the system. Then, after obtaining the target heating heat, it needs to be converted into a control command for the heater. Considering the efficiency loss when the heater converts electrical energy into heat energy and transfers it to the exhaust gas, the actual required electrical work input must be greater than the theoretical heat work. Therefore, the controller performs the following calculation: Required heating time = Target heating heat / (Heater power × Heating efficiency). After obtaining the heating time, the heater control module generates a corresponding pulse width modulation signal or a timing activation command to control the heater to operate according to the calculated heating time. During this period, the heater operates at full capacity, converting electrical energy into heat energy to rapidly and centrally heat the flowing exhaust gas. After the heating process is completed, the system automatically returns to the monitoring and prediction state and determines subsequent actions based on the new predicted temperature.

[0040] like Figure 7 The diagram shows the control logic of the heater in the denitrification equipment. First, it determines whether the heater is energized. When it is energized, the heater starts working. The theoretical input heat of the heater is calculated from the temperature deviation and heat capacity. The theoretical input heat of the heater is divided by the heater power and heating efficiency to obtain the final working time of the heater.

[0041] As can be seen, the present invention provides a method for collecting and inputting exhaust gas parameters of a denitrification device, including exhaust gas inlet temperature, exhaust gas mass flow rate, and ambient temperature; calculating the exhaust gas heat input to the denitrification device based on the exhaust gas inlet temperature and exhaust gas mass flow rate; calculating the total heat loss of the denitrification device during denitrification operation; calculating the predicted temperature of the denitrification device using a preset temperature prediction model and based on the exhaust gas heat and the total heat loss; comparing the predicted temperature with a preset reaction temperature threshold to obtain a temperature deviation; and if the temperature deviation meets preset heating conditions, controlling the heater to start according to the temperature deviation to heat the denitrification device before its temperature drops to the preset reaction temperature threshold. Therefore, by collecting the exhaust gas inlet temperature and exhaust gas mass flow rate, the energy flow about to enter the denitrification equipment is reflected. This allows for the earlier detection of trends leading to temperature changes compared to simply measuring the current temperature inside or at the outlet of the equipment. By calculating the exhaust gas heat and heat loss, the temperature state that the denitrification equipment will reach is further predicted. The predicted temperature is compared with the threshold. Once the model predicts that the equipment temperature will drop below the optimal reaction temperature, the heating control logic is immediately triggered to achieve preheating.

[0042] like Figure 8 As shown, the present invention also discloses a temperature control device for a denitrification equipment, comprising: Parameter acquisition module 11 is used to acquire the exhaust gas parameters of the denitrification equipment, including exhaust gas inlet temperature, exhaust gas mass flow rate and ambient temperature. The exhaust gas heat calculation module 12 is used to calculate the exhaust gas heat input to the denitrification equipment based on the exhaust gas inlet temperature and the exhaust gas mass flow rate in the exhaust gas parameters. The heat loss calculation module 13 is used to calculate the total heat loss of the denitrification equipment during the denitrification operation process. Temperature prediction module 14 is used to calculate the predicted temperature of the denitrification equipment based on the heat of the exhaust gas and the total heat loss by using a preset temperature prediction model. The deviation acquisition module 15 is used to compare the predicted temperature with the preset reaction temperature threshold to obtain the temperature deviation; The preheating module 16 is used to control the heater to start according to the temperature deviation if the temperature deviation meets the preset heating conditions, so as to heat the equipment before the temperature drops to the preset reaction temperature threshold.

[0043] It is evident that by working together with parameter acquisition, heat calculation, prediction model and preheating module, feedforward control of the temperature of denitrification equipment can be achieved, ensuring system stability and reliability. It can predict temperature change trends in real time and intervene in advance, thus completely solving the temperature lag problem of traditional feedback control. While ensuring continuous compliance with emission standards, it improves the operating efficiency and economy of the denitrification system.

[0044] Furthermore, embodiments of this application also disclose an electronic device, Figure 9 This is a structural diagram of an electronic device 20 according to an exemplary embodiment. The content of the diagram should not be construed as limiting the scope of this application.

[0045] Figure 9 This is a schematic diagram of the structure of an electronic device 20 provided in an embodiment of this application. Specifically, the electronic device 20 may include: at least one processor 21, at least one memory 22, a power supply 23, a communication interface 24, an input / output interface 25, and a communication bus 26. The memory 22 stores a computer program, which is loaded and executed by the processor 21 to implement the relevant steps in the temperature control method of the denitrification equipment disclosed in any of the foregoing embodiments. Alternatively, the electronic device 20 in this embodiment may specifically be an electronic computer.

[0046] In this embodiment, the power supply 23 is used to provide operating voltage for each hardware device on the electronic device 20; the communication interface 24 can create a data transmission channel between the electronic device 20 and external devices, and the communication protocol it follows can be any communication protocol applicable to the technical solution of this application, and is not specifically limited here; the input / output interface 25 is used to acquire external input data or output data to the outside world, and its specific interface type can be selected according to specific application needs, and is not specifically limited here.

[0047] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0048] In addition, the memory 22, as a carrier for resource storage, can be a read-only memory, random access memory, disk or optical disk, etc. The resources stored thereon can include operating system 221, computer program 222, etc., and the storage method can be temporary storage or permanent storage.

[0049] The operating system 221 manages and controls the various hardware devices and computer programs 222 on the electronic device 20 to enable the processor 21 to perform calculations and processing on the massive amounts of data 223 in the memory 22. It can be Windows Server, Netware, Unix, Linux, etc. The computer program 222, in addition to including a computer program capable of performing the temperature control method for the denitrification equipment executed by the electronic device 20 as disclosed in any of the foregoing embodiments, may further include computer programs capable of performing other specific tasks. The data 223 may include data received by the electronic device from external devices, as well as data collected by its own input / output interface 25.

[0050] Furthermore, this application also discloses a computer-readable storage medium for storing a computer program; wherein, when the computer program is executed by a processor, it implements the aforementioned temperature control method for the denitrification equipment. Specific steps of this method can be found in the corresponding content disclosed in the foregoing embodiments, and will not be repeated here.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0052] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application. The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly in hardware, software modules executed by a processor, or a combination of both. The software module may be located in random access memory (RAM), memory, read-only memory (ROM), electrically programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, removable disks, CD-ROMs (Compact Disc-Read Only Memory), or any other form of storage medium known in the art.

[0053] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0054] The solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A temperature control method of a denitration apparatus, characterized by, The method comprises the following steps: collecting tail gas parameters input into a denitration device, wherein the tail gas parameters comprise tail gas inlet temperature, tail gas mass flow and ambient temperature; calculating tail gas heat input into the denitration device based on the tail gas inlet temperature and the tail gas mass flow in the tail gas parameters; calculating total heat loss of the denitration device during denitration operation; calculating predicted temperature of the denitration device through a preset temperature prediction model and based on the tail gas heat and the total heat loss; comparing the predicted temperature with a preset reaction temperature threshold to obtain temperature deviation; if the temperature deviation meets preset heating conditions, controlling a heater to start according to the temperature deviation to perform heating before the temperature of the denitration device drops to the preset reaction temperature threshold.

2. The temperature control method of a de-NOx apparatus according to claim 1, characterized by, The calculation of the total heat loss of the denitration device during denitration operation comprises the following steps: calculating a first heat loss of heat conduction loss of the denitration device during denitration operation; calculating a second heat loss of heat radiation loss of the denitration device during denitration operation based on the ambient temperature; calculating the total heat loss based on the sum of the first heat loss and the second heat loss.

3. The temperature control method of a de-NOx apparatus according to claim 2, characterized by, The calculation of the first heat loss of heat conduction loss of the denitration device during denitration operation comprises the following steps: calculating the first heat loss based on thermal conductivity, heat conduction area, temperature difference between two sides of a wall of the denitration device and thickness of a material of the denitration device.

4. The temperature control method of a de-NOx apparatus according to claim 2, characterized by, The calculation of the second heat loss of heat radiation loss of the denitration device during denitration operation based on the ambient temperature comprises the following steps: calculating the second heat loss based on surface emissivity, radiation surface area, absolute temperature of an outer wall of the denitration device and the ambient temperature.

5. The temperature control method of a de-NOx apparatus according to claim 1, characterized by, The calculation of the predicted temperature of the denitration device through a preset temperature prediction model and based on the tail gas heat and the total heat loss comprises the following steps: calculating net input heat of the denitration device by subtracting the total heat loss from the tail gas heat through the preset temperature prediction model; calculating and outputting predicted temperature according to the net input heat and heat capacity of the denitration device through the preset temperature prediction model.

6. The temperature control method of a de-NOx apparatus according to claim 1, characterized by, The preset heating conditions comprise state conditions and time conditions, wherein the state conditions are that the temperature deviation exceeds a preset temperature difference threshold and an engine is in an operating state; the time conditions are that a first time when the temperature deviation exceeds the preset temperature difference threshold exceeds a first time threshold and a second time when the engine is in the operating state exceeds a second time threshold.

7. The temperature control method of a de-NOx apparatus according to claim 1, characterized by, The control of the heater to start according to the temperature deviation to perform heating before the temperature of the denitration device drops to the preset reaction temperature threshold comprises the following steps: calculating target heating heat required for controlling the denitration device to reach the preset reaction temperature threshold based on the temperature deviation and heat capacity of the denitration device; calculating heating time of the heater according to the target heating heat, power of the heater and heating efficiency; controlling the heater to perform heating operation according to the heating time.

8. A temperature control device of a denitration apparatus, characterized by, The method comprises the following steps: a parameter collection module is configured to collect tail gas parameters input into a denitration device, wherein the tail gas parameters comprise tail gas inlet temperature, tail gas mass flow and ambient temperature; a tail gas heat calculation module configured to calculate a tail gas heat for inputting into the denitration device based on the tail gas inlet temperature and the tail gas mass flow in the tail gas parameters; a heat loss amount calculation module configured to calculate a total heat loss amount of the denitration device during denitration operation; a temperature prediction module configured to calculate a predicted temperature of the denitration device by a preset temperature prediction model and based on the tail gas heat and the total heat loss amount; a deviation acquisition module configured to compare the predicted temperature with a preset reaction temperature threshold to obtain a temperature deviation; a preheating module configured to control a heater to start according to the temperature deviation to perform heating before the temperature of the denitration device drops to the preset reaction temperature threshold if the temperature deviation satisfies a preset heating condition.

9. An electronic device, comprising: comprising: a memory configured to save a computer program; a processor configured to execute the computer program to implement steps of the temperature control method of the denitration device according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, a memory configured to save a computer program; wherein the computer program is executed by a processor to implement steps of the temperature control method of the denitration device according to any one of claims 1 to 7.

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