Emission control system and emission control method

Abstract

Embodiments of the present invention disclose an emission control system and an emission control method. The emission control system includes: a preheating function module, a regeneration function module, a purge function module, and a sootblowing function module. The preheating function module is communicatively connected to the regeneration function module and the sootblowing function module, and is configured to respond to a reactor preheating instruction and add a first supplemental fuel to the reactor; the regeneration function module is communicatively connected to the purge function module and is configured to respond to a reactor periodic heating instruction and add a second supplemental fuel to the reactor; the purge function module is configured to respond to a fan purge instruction and activate the fan to deliver high-pressure gas to the pipeline; and the sootblowing function module is configured to respond to a solenoid valve sootblowing instruction and activate the reactor's solenoid valve to perform a sootblowing operation into the reactor. The technical solution of the embodiment of the present invention improves the reaction efficiency of the catalyst in the emission control system, thereby reducing the amount of emissions.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of exhaust gas treatment, and in particular to an emission control system and an emission control method. Background Art

[0002] Currently, emission control systems utilize selective catalytic reduction (SCR) technology to treat exhaust emissions. Specifically, a reducing agent is injected into the exhaust after it enters the emission control system. The catalyst purifies the polluting exhaust.

[0003] During the process of implementing the embodiments of the present invention, the inventors discovered that the temperature of the reactor of the existing emission control system was relatively low, resulting in low catalyst reaction efficiency in the reactor. Summary of the Invention

[0004] The embodiments of the present invention provide an emission control system and an emission control method, which improve the reaction efficiency of a catalyst in the emission control system, thereby reducing the emission amount of emissions.

[0005] According to one aspect of the present invention, an emission control system is provided, comprising: a preheating function module, a regeneration function module, a purge function module and a sootblowing function module, wherein:

[0006] The preheating function module is in communication with the regeneration function module and is in communication with the soot blowing function module, and is configured to respond to a reactor preheating instruction and add a first supplementary combustion agent to the reactor; wherein the first supplementary combustion agent is configured to increase the reaction temperature of the reactor;

[0007] The regeneration function module is in communication with the purge function module and is configured to respond to a periodic heating instruction of the reactor and add a second supplementary fuel to the reactor; wherein the second supplementary fuel is configured to decompose reactants on the surface of the replacement catalyst;

[0008] The purge function module is used to respond to the blower purge instruction and start the blower to deliver high-pressure gas to the pipeline;

[0009] The soot blowing function module is used to respond to the solenoid valve soot blowing instruction, open the solenoid valve of the reactor, and perform soot blowing operation on the reactor.

[0010] According to another aspect of the present invention, there is provided an emission control method, comprising:

[0011] In response to the reactor preheating instruction, the first supplementary combustion agent is added to the reactor through the preheating function module; wherein the first supplementary combustion agent is used to increase the reaction temperature of the reactor;

[0012] In response to the reactor periodic heating instruction, the regeneration function module adds the second supplementary fuel to the reactor; wherein the second supplementary fuel is used to decompose and replace the reactants on the catalyst surface;

[0013] Responding to the blower purge instruction through the purge function module, turning on the blower to deliver the high-pressure gas to the pipeline;

[0014] The soot blowing function module responds to the solenoid valve soot blowing instruction, opens the solenoid valve of the reactor, and performs a soot blowing operation on the reactor.

[0015] The technical solution of the embodiment of the present invention is to respond to the reactor preheating instruction through the preheating function module and add the first supplementary fuel to the reactor. The regeneration function module responds to the reactor periodic heating instruction and adds the second supplementary fuel to the reactor. Correspondingly, the purge function module responds to the fan purge instruction and turns on the fan to transport the high-pressure gas to the pipeline. Furthermore, the soot blowing function module responds to the solenoid valve soot blowing instruction, opens the solenoid valve of the reactor, and performs soot blowing operation on the reactor. The embodiment of the present invention utilizes the preheating function module in the emission control system to perform the reactor preheating operation, solves the problem of low catalyst reaction efficiency caused by low temperature of the emission control system, improves the reaction efficiency of the catalyst in the emission control system, and thus reduces the emission of emissions.

[0016] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 is a schematic diagram of an emission control system provided in Example 1 of the present invention;

[0019] Figure 2 This is a schematic structural diagram of an emission control system provided by Embodiment 2 of the present invention;

[0020] Figure 3 This is a flow chart of an emission control method provided in Example 3 of the present invention;

[0021] Figure 4This is a schematic structural diagram of a low-pressure emission control system provided by the third embodiment of the present invention;

[0022] Figure 5 Schematic diagram of an emission control strategy of a low-pressure emission control system provided in embodiment three of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Example 1

[0026] Figure 1 is a schematic diagram of an emission control system provided by the first embodiment of the present invention, such as Figure 1 As shown, the emission control system may include: a preheating function module 110, a regeneration function module 120, a purge function module 130 and a soot blowing function module 140. Among them:

[0027] The preheating function module 110 is communicatively connected to the regeneration function module 120 , and is also communicatively connected to the sootblowing function module 140 .

[0028] The preheating function module 110 can be used to respond to the reactor preheating instruction and add a first supplementary combustion agent to the reactor, wherein the first supplementary combustion agent is used to increase the reaction temperature of the reactor.

[0029] The reactor preheating instruction may be an instruction used by the emission control system to implement the reactor preheating operation.

[0030] In an embodiment of the present invention, the preheating function module 110 may add a first post-combustion agent to the reactor of the emission control system in response to a reactor preheating instruction, so as to improve the treatment efficiency of the catalyst in the reactor.

[0031] The regeneration function module 120 is communicatively connected to the purge function module 130 .

[0032] The regeneration function module 120 can be used to respond to the reactor periodic heating instruction and add a second supplementary fuel to the reactor, wherein the second supplementary fuel is used to decompose the reactants on the surface of the replacement catalyst.

[0033] The reactor periodic heating instruction may be an instruction for implementing a decomposition and replacement operation on reactants on the catalyst surface in the emission control system reactor.

[0034] Accordingly, the regeneration function module 120 may be configured to add a second post-combustion agent to the reactor in response to the reactor periodic heating instruction to prevent the generation of catalyst reactants on the catalyst surface in the emission control system reactor.

[0035] The purge function module 130 can be used to respond to a blower purge instruction and start the blower to deliver high-pressure gas to the pipeline.

[0036] The blower purge instruction may be an instruction for performing a flue gas purge operation on a pipeline of an emission control system. The blower may be used to replenish high-pressure gas to the pipeline of the emission control system.

[0037] Furthermore, the purge function module 130 can be used to respond to a blower purge instruction and start the blower to deliver high-pressure gas to the pipeline, so as to purge the flue gas in the emission control system pipeline.

[0038] The soot blowing function module 140 may be configured to respond to a solenoid valve soot blowing instruction, open the solenoid valve of the reactor, and perform a soot blowing operation on the reactor.

[0039] The solenoid valve soot blowing instruction may be an instruction for implementing a soot blowing operation on a catalyst surface in a reactor of an emission control system. The solenoid valve is a valve element controlled by electromagnetics.

[0040] In an embodiment of the present invention, the soot blowing function module 140 may be configured to respond to a solenoid valve soot blowing instruction and open the solenoid valve of the reactor to perform soot blowing on the catalyst surface in the reactor of the emission control system.

[0041] The technical solution of the embodiment of the present invention is to respond to the reactor preheating instruction through the preheating function module and add the first supplementary fuel to the reactor. The regeneration function module responds to the reactor periodic heating instruction and adds the second supplementary fuel to the reactor. Correspondingly, the purge function module responds to the fan purge instruction and turns on the fan to transport the high-pressure gas to the pipeline. Furthermore, the soot blowing function module responds to the solenoid valve soot blowing instruction, opens the solenoid valve of the reactor, and performs soot blowing operation on the reactor. The embodiment of the present invention utilizes the preheating function module in the emission control system to perform the reactor preheating operation, solves the problem of low catalyst reaction efficiency caused by low temperature of the emission control system, improves the reaction efficiency of the catalyst in the emission control system, and thus reduces the emission of emissions.

[0042] Example 2

[0043] Figure 2 This is a schematic diagram of the structure of an emission control system provided in Example 2 of the present invention. This embodiment further refines the aforementioned technical solutions, combining the technical solutions of this embodiment with the various optional solutions in one or more of the aforementioned embodiments. This emission control system may include: a preheating module 210, a regeneration module 220, a purge module 230, and a sootblowing module 240.

[0044] The preheating function module 210 is communicatively connected to the regeneration function module 220 , and is also communicatively connected to the sootblowing function module 240 .

[0045] The preheating function module 210 can be used to respond to the reactor preheating instruction, open the system bypass valve, close the reactor inlet valve, and open the reactor outlet valve to a specified opening; turn on the fan to a fixed flow rate and add the first afterburner to automatically adjust the afterburner outlet temperature; when it is determined that the reactor inlet and outlet temperatures have reached the preset temperature, turn off the fan and the reactor outlet valve.

[0046] The reactor may be a device used to implement a reaction process. The system bypass valve may be a valve used to control a bypass pipeline. The reactor inlet valve may be a valve installed at the reactor inlet. The reactor outlet valve may be a valve installed at the reactor outlet. The blower may be a device used to replenish gas to the pipeline of the emission control system.

[0047] In an embodiment of the present invention, when the temperature of the reactor in the emission control system is low, the preheating function module can respond to the reactor preheating instruction and sequentially open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, and automatically adjust the afterburner outlet temperature by starting the circulating fan at a fixed flow rate and adding a first afterburner. When the reactor outlet and inlet temperatures reach a preset temperature, the circulating fan and the reactor outlet valve of the emission control system are closed. For example, if the emission control system controls marine diesel engine exhaust emissions, considering that the reactor temperature in the emission control system is low under low pressure and the reaction temperature in the reactor is required to reach 250°C, then when the reactor of the emission control system is below 250°C, the preheating function module can respond to the reactor preheating instruction and sequentially open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, start the circulating fan at a fixed flow rate, and add a first afterburner to automatically adjust the afterburner outlet temperature. When the reactor outlet and inlet temperatures reach 250°C, the circulating fan and the reactor outlet valve of the emission control system are closed.

[0048] The regeneration function module 220 is communicatively connected to the purge function module 230 .

[0049] The regeneration function module 220 can be used to respond to the reactor's periodic heating instruction when it is detected that the reactor generates reactants on the catalyst surface, open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve to a specified opening, add the second supplementary fuel, and open the system throttle valve; decompose and replace the reactants on the catalyst surface within a preset reaction time.

[0050] Among them, the system throttle valve can be used to reduce the medium pressure in the emission control system pipeline.

[0051] Accordingly, when the regeneration function module 220 of the emission control system detects the presence of reactants on the catalyst surface within the reactor, the regeneration function module 220 can respond to the reactor periodic heating instruction and sequentially open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, add a second afterburner, and open the system throttle valve of the emission control system to achieve decomposition and replacement of the reactants on the catalyst surface within a preset reaction time. Continuing with the example of an emission control system that controls marine diesel engine exhaust emissions, when the reactant ammonium bisulfate is detected on the catalyst surface within the reactor of the emission control system, the regeneration function module 220 can respond to the reactor periodic heating instruction and sequentially open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, add a second afterburner, and open the system throttle valve of the emission control system to achieve decomposition and replacement of the ammonium bisulfate on the catalyst surface within a preset reaction time.

[0052] The purge function module 230 can be used to determine a preset purge time; when it is determined that the reaction time reaches the preset purge time, it responds to the fan purge instruction, opens the system bypass valve, closes the reactor inlet valve, opens the reactor outlet valve to a specified opening, opens the system bypass valve, and starts the fan.

[0053] In an embodiment of the present invention, due to a certain amount of gas leakage from the reactor inlet valve and reactor outlet valve during the reaction process of the emission control system reactor, it is necessary to purge the emission control system pipeline. The purge function module 230 of the emission control system can obtain a preset purge time. When it is determined that the reaction time has reached the preset purge time, the purge function module 230 of the emission control system responds to the blower purge instruction, opens the system bypass valve, closes the reactor inlet valve, opens the reactor outlet valve of the emission control system to a specified opening, opens the system bypass valve, and starts the blower to replenish high-pressure gas to the emission control system pipeline, thereby purging the flue gas in the emission control system pipeline.

[0054] The soot blowing function module 240 can be used to respond to the solenoid valve soot blowing instruction, open the solenoid valve, and use the solenoid valve to blow the catalyst surface.

[0055] Accordingly, the sootblowing module 240 of the emission control system can be configured to respond to solenoid valve sootblowing commands and open the solenoid valves, thereby purging the catalyst surfaces in the emission control system reactor to prevent flue gas from clogging the catalysts. Continuing with the example of an emission control system controlling marine diesel engine exhaust emissions, when flue gas is detected entering the emission control system reactor, the sootblowing module 240 responds to the solenoid valve sootblowing command and opens the twelve solenoid valves in the emission control system. By controlling the twelve solenoid valves, the catalyst surfaces in the emission control system reactor are purged to prevent flue gas from clogging the catalysts.

[0056] The emission control system may further include an automatic control module 290 and a manual control module 2100 .

[0057] The automatic control module 290 is in communication with the preheating function module 210 , the regeneration function module 220 , the purge function module 230 , the soot blowing function module 240 and the injection function module 250 .

[0058] The automatic control module 290 can be used to implement automatic control of the system.

[0059] The automatic control module 290 may further include: a T2 function configuration module 270 , a PRET3 function configuration module 260 and a T3 function configuration module 280 .

[0060] The T2 function configuration module 270 is in communication with the preheating function module 210 , the regeneration function module 220 , and the purge function module 230 , and is configured to perform preheating processing on the reactor.

[0061] The PRET3 function configuration module 260 is in communication with the preheating function module 210 and the soot blowing function module 240 and is used to perform a replacement process on the catalyst surface reactants.

[0062] The T3 function configuration module 280 is in communication with the injection function module 250 for injecting exhaust.

[0063] In an embodiment of the present invention, the automatic control module 290 can configure the T2 function configuration module 270, the PRET3 function configuration module 260, and the T3 function configuration module 280 to realize the automatic control of the emission control system using the T2 function configuration module 270, the PRET3 function configuration module 260, and the T3 function configuration module 280. The T2 function configuration module 270 can configure the preheating function module 210, the regeneration function module 220, and the purge function module 230 to realize preheating treatment of the reactor. The PRET3 function configuration module 260 can configure the preheating function module 210 and the soot blowing function module 240 to realize replacement treatment of reactants on the catalyst surface. The T3 function configuration module 280 can configure the injection function module 250 for injecting emissions.

[0064] The manual control module 2100 is in communication with the preheating function module 210 , the regeneration function module 220 , the purge function module 230 , and the sootblowing function module 240 .

[0065] Accordingly, the manual control module 2100 of the emission control system configures the preheating function module 210 , the regeneration function module 220 , the purge function module 230 , and the soot blowing function module 240 to adjust the opening of each valve in the emission control system.

[0066] The technical solution of the embodiment of the present invention is to communicatively connect a preheating function module with a regeneration function module and a sootblowing function module. The module is configured to respond to a reactor preheating instruction by opening a system bypass valve, closing the reactor inlet valve, and opening the reactor outlet valve to a specified opening. The module is configured to start the fan at a fixed flow rate and add a first afterburner to automatically adjust the afterburner outlet temperature. Upon determining that the reactor inlet and outlet temperatures have reached a preset temperature, the fan and the reactor outlet valve are turned off. The module is also configured to respond to a reactor periodic heating instruction by opening the system bypass valve, closing the reactor inlet valve, opening the reactor outlet valve to a specified opening, adding a second afterburner, and opening the system throttle valve to decompose and replace reactants on the catalyst surface within a preset reaction time. The purge function module determines a preset purge time. Upon determining that the reaction time has reached the preset purge time, the module responds to a fan purge instruction by opening the system bypass valve, closing the reactor inlet valve, and opening the reactor outlet valve to a specified opening. The module then opens the system bypass valve and starts the fan. The sootblowing function module responds to a solenoid valve sootblowing instruction by opening the solenoid valve and using the solenoid valve to purge the catalyst surface. The automatic control module is connected in communication with the preheating function module, the regeneration function module, the purge function module, the soot blowing function module and the injection function module, and is used to realize automatic control of the system. The injection function module is used to inject emissions in quantity. The manual control module is connected in communication with the preheating function module, the regeneration function module, the purge function module and the soot blowing function module, and is used to adjust the opening of the system valve. The T2 function configuration module is connected in communication with the preheating function module, the regeneration function module and the purge function module, and is used to preheat the reactor. The PRET3 function configuration module is connected in communication with the preheating function module and the soot blowing function module, and is used to replace the reactants on the catalyst surface, thereby solving the problem of low catalyst reaction efficiency caused by low temperature of the emission control system. By preheating, soot blowing and purging the catalyst in the reactor, the reaction efficiency of the catalyst in the emission control system is improved, thereby reducing the emission of emissions.

[0067] Example 3

[0068] Figure 3 This is a flow chart of an emission control method provided by the third embodiment of the present invention. This embodiment is applicable to the case where the emission control system is used to control the emission amount injection. Figure 3 As shown, the method includes the following operations:

[0069] S310. Responding to the reactor preheating instruction through the preheating function module, adding the first supplementary combustion agent to the reactor; wherein the first supplementary combustion agent is used to increase the reaction temperature of the reactor.

[0070] In an optional embodiment of the present invention, responding to the reactor preheating instruction through the preheating function module and adding the first supplementary fuel to the reactor may include: responding to the reactor preheating instruction, opening the system bypass valve, closing the reactor inlet valve, and opening the reactor outlet valve to a specified opening; turning on the fan to a fixed flow rate and adding the first supplementary fuel to automatically adjust the afterburner outlet temperature; after adding the first supplementary fuel to the reactor, it may also include: when it is determined that the reactor inlet and outlet temperatures have reached the preset temperature, closing the fan and the reactor outlet valve.

[0071] In an embodiment of the present invention, the preheating function module of the emission control system can respond to the reactor preheating instruction and sequentially open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, and automatically adjust the afterburner outlet temperature by starting the circulating fan at a fixed flow rate and adding a first afterburner. After adding the first afterburner to the reactor, when the reactor inlet and outlet temperatures reach a preset temperature, the circulating fan and the reactor outlet valve of the emission control system are closed.

[0072] S320. Responding to the reactor periodic heating instruction through the regeneration function module, adding the second supplementary fuel to the reactor; wherein the second supplementary fuel is used to decompose and replace the reactants on the catalyst surface.

[0073] In an optional embodiment of the present invention, responding to the reactor periodic heating instruction through the regeneration function module and adding the second supplementary fuel to the reactor may include: when it is detected that the reactor generates reactants on the catalyst surface, responding to the reactor periodic heating instruction, opening the system bypass valve, closing the reactor inlet valve, opening the reactor outlet valve to a specified opening, adding the second supplementary fuel, and opening the system throttle valve; after adding the second supplementary fuel to the reactor, it may also include: decomposing and replacing the reactants on the catalyst surface within the preset reaction time.

[0074] Furthermore, when the regeneration function module of the emission control system detects the presence of reactants on the catalyst surface in the reactor, it can respond to the reactor periodic heating instruction, open the system bypass valve in sequence, close the reactor inlet valve, open the reactor outlet valve of the emission control system to a specified opening, add a second refueling agent and open the system throttle valve of the emission control system to achieve decomposition and replacement of the reactants on the catalyst surface within a preset reaction time.

[0075] S330: Respond to the blower purge instruction through the purge function module and turn on the blower to deliver the high-pressure gas to the pipeline.

[0076] In an embodiment of the present invention, the purge function module of the emission control system can obtain a preset purge time. When it is determined that the reaction time reaches the preset purge time, the purge function module of the emission control system responds to the fan purge instruction, opens the system bypass valve, closes the reactor inlet valve, opens the reactor outlet valve of the emission control system to a specified opening, opens the system bypass valve, and starts the fan to replenish high-pressure gas to the emission control system pipeline and thereby blow away the flue gas in the emission control system pipeline.

[0077] S340 , responding to the solenoid valve soot blowing instruction through a soot blowing function module, opening the solenoid valve of the reactor, and performing a soot blowing operation on the reactor.

[0078] Accordingly, the soot blowing function module of the emission control system can respond to the solenoid valve soot blowing instruction, open the solenoid valve, and use the solenoid valve to purge the catalyst surface in the emission control system reactor to prevent flue gas from clogging the catalyst.

[0079] In a specific example, an emission control system for controlling exhaust emissions from ship diesel engines is taken as an example for detailed description.

[0080] The emission control system used to control exhaust emissions from marine diesel engines is mainly used to control the injection amount of urea so that the control valves on the emission control system pipeline operate according to established processes under different working modes, while controlling the afterburning unit, reactor unit, fan unit and urea unit.

[0081] Currently, emission control systems for marine diesel engine exhaust emissions are divided into low-pressure and high-pressure emission control systems. The exhaust gas temperature before the turbocharger of a marine diesel engine is approximately 300-450°C, and the pressure can reach up to 4 bar. The exhaust gas temperature after the turbocharger is approximately 210-260°C, and the pressure is approximately 0.03 bar. Placing the emission control system before the turbocharger is a high-pressure emission control system, while placing the emission control system after the turbocharger is a low-pressure emission control system.

[0082] Figure 4 This is a schematic diagram of the structure of a low-pressure emission control system provided by the third embodiment of the present invention. Figure 4As shown in the figure, a low-pressure emission control system for controlling marine diesel engine exhaust emissions can include a control box, a remote control panel, several junction boxes, and execution boxes for each module. The control box controls the urea injection system, the main engine emission reduction control system, the centralized monitoring and alarm system, the main valve, the combustion unit, the soot blowing unit, the reactor unit, and the nitrogen oxide concentration sensor within the low-pressure emission control system. The control box collects signals from each module and interacts with external signals from the emission control system, responsible for the coordination of the emission control system and equipment control. The remote control panel primarily provides functions such as data display, storage, and parameter setting.

[0083] The layout of the low-pressure emission control system reactor is relatively convenient. However, due to the low ambient temperature of the low-pressure emission control system reaction, its catalyst is not flexible enough, the reaction efficiency is low, and sulfate is generated during the reaction process, causing the catalyst to fail. Therefore, the present invention increases the control of the afterburning agent to heat the pipeline of the low-pressure emission control system to improve the catalyst reaction efficiency and ensure that the exhaust gas emissions meet the emission standards.

[0084] Figure 5 Schematic diagram of an emission control strategy of a low-pressure emission control system provided by the third embodiment of the present invention, such as Figure 5 As shown, the low-pressure emission control system may include main functional modules such as a preheating functional module, a regeneration functional module, a purge functional module, a soot blowing functional module, a urea injection functional module, and an alarm functional module.

[0085] Among them, the preheating function module solves the low temperature problem of the low-pressure emission control system by adding afterburner. The Tire3 function configuration module of the low-pressure emission control system is used to control the afterburner to heat the reactor temperature to the specified temperature, thereby improving the processing efficiency of the catalyst and making the exhaust gas emissions meet the emission standards.

[0086] The regeneration function module uses a fuel to heat the reactor to a set temperature and maintain it for a certain period of time, thereby achieving decomposition and replacement of ammonium bisulfate on the catalyst surface in the reactor of the low-pressure emission control system.

[0087] The purge function module uses a blower to periodically purge the flue gas in the pipeline of the low-pressure emission control system to prevent flue gas blockage.

[0088] The urea injection function module can control the amount of urea injected by the urea injection system according to the urea set value sent by the host, thereby reducing the concentration of nitrogen oxides and thus reducing the emission of emissions.

[0089] The low-pressure emission control system's configuration modules can be manually selected on the display, which displays readings from key sensors, including temperature, pressure, and differential pressure. The low-pressure emission control system's fault alarm shutdown module can determine the upper or lower alarm thresholds and issue an alarm signal, while also displaying the relevant alarm prompts on the display.

[0090] The technical solution of the embodiment of the present invention is to respond to the reactor preheating instruction through the preheating function module and add the first supplementary fuel to the reactor. The regeneration function module responds to the reactor periodic heating instruction and adds the second supplementary fuel to the reactor. Correspondingly, the purge function module responds to the fan purge instruction and turns on the fan to transport the high-pressure gas to the pipeline. Furthermore, the soot blowing function module responds to the solenoid valve soot blowing instruction, opens the solenoid valve of the reactor, and performs soot blowing operation on the reactor. The embodiment of the present invention utilizes the preheating function module in the emission control system to perform the reactor preheating operation, solves the problem of low catalyst reaction efficiency caused by low temperature of the emission control system, improves the reaction efficiency of the catalyst in the emission control system, and thus reduces the emission of emissions.

Claims

1. An emission control system, characterized in that: It includes preheating function module, regeneration function module, purge function module and soot blowing function module, among which: The preheating function module is in communication with the regeneration function module and is in communication with the soot blowing function module, and is configured to respond to a reactor preheating instruction and add a first supplementary combustion agent to the reactor; wherein the first supplementary combustion agent is configured to increase the reaction temperature of the reactor; The regeneration function module is in communication with the purge function module and is configured to respond to a periodic heating instruction of the reactor and add a second supplementary fuel to the reactor; wherein the second supplementary fuel is configured to decompose reactants on the surface of the replacement catalyst; The purge function module is used to respond to the blower purge instruction and start the blower to deliver high-pressure gas to the pipeline; The soot blowing function module is used to respond to the solenoid valve soot blowing instruction, open the solenoid valve of the reactor, and perform soot blowing operation on the reactor; The preheating function module is further configured to: in response to the reactor preheating instruction, open the system bypass valve, close the reactor inlet valve, and open the reactor outlet valve to a specified opening; start the fan to a fixed flow rate and add the first afterburner to automatically adjust the outlet temperature of the afterburner; and close the fan and the reactor outlet valve when it is determined that the reactor inlet and outlet temperatures have reached a preset temperature; The regeneration function module is also used to: when it is detected that the reactor generates reactants on the catalyst surface, respond to the reactor periodic heating instruction, open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve to a specified opening, add the second supplementary fuel, and open the system throttle valve; decompose and replace the reactants on the catalyst surface within a preset reaction time.

2. The system according to claim 1, wherein: The purge function module is also used for: Determine the preset purge time; When it is determined that the reaction time reaches the preset purge time, respond to the fan purge instruction, open the system bypass valve, close the reactor inlet valve, open the reactor outlet valve to a specified opening, open the system bypass valve, and start the fan.

3. The system according to claim 1, wherein: The soot blowing function module is also used for: In response to the solenoid valve soot blowing instruction, the solenoid valve is opened; The solenoid valve is used to purge the surface of the catalyst.

4. The system according to claim 1, wherein: The control system also includes an automatic control module and a manual control module; The automatic control module is in communication with the preheating function module, the regeneration function module, the purge function module, the soot blowing function module and the injection function module, so as to realize automatic control of the system; the injection function module is used to inject the emission in a certain amount; The manual control module is in communication with the preheating function module, the regeneration function module, the purge function module, and the soot blowing function module, and is used to adjust the opening of the system valve.

5. The system according to claim 4, characterized in that The automatic control module includes a T2 function configuration module, a PRET3 function configuration module and a T3 function configuration module; The T2 function configuration module is in communication with the preheating function module, the regeneration function module and the purge function module, and is used to perform preheating treatment on the reactor; The PRET3 function configuration module is in communication with the preheating function module and the soot blowing function module, and is used to perform a replacement process on the catalyst surface reactants; The T3 function configuration module is in communication with the injection function module and is used for injecting emissions.

6. An emission control method, characterized in that: The emission control system according to claim 1 comprises: In response to the reactor preheating instruction, the first supplementary combustion agent is added to the reactor through the preheating function module; wherein the first supplementary combustion agent is used to increase the reaction temperature of the reactor; In response to the reactor periodic heating instruction, the regeneration function module adds the second supplementary fuel to the reactor; wherein the second supplementary fuel is used to decompose and replace the reactants on the catalyst surface; Responding to the blower purge instruction through the purge function module, turning on the blower to deliver the high-pressure gas to the pipeline; The soot blowing function module responds to the solenoid valve soot blowing instruction, opens the solenoid valve of the reactor, and performs a soot blowing operation on the reactor.

7. The method according to claim 6, characterized in that The adding the first supplementary combustion agent to the reactor in response to the reactor preheating instruction through the preheating function module includes: In response to the reactor preheating instruction, the system bypass valve is opened, the reactor inlet valve is closed, and the reactor outlet valve is opened to a specified opening; Turning on the blower to a fixed flow rate and adding the first afterburner to automatically adjust the outlet temperature of the afterburner; After adding the first supplementary combustion agent to the reactor, the method further comprises: When it is determined that the inlet and outlet temperatures of the reactor have reached a preset temperature, the blower and the reactor outlet valve are closed.

8. The method according to claim 6, characterized in that The adding of the second supplementary combustion agent to the reactor in response to the reactor periodic heating instruction by the regeneration function module comprises: When it is detected that the reactor generates reactants on the catalyst surface, in response to the reactor periodic heating instruction, the system bypass valve is opened, the reactor inlet valve is closed, the reactor outlet valve is opened to a specified opening, the second supplemental fuel is added, and the system throttle valve is opened; After adding the second supplementary combustion agent to the reactor, the method further comprises: The reactants on the catalyst surface are decomposed and replaced within a preset reaction time.

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