Marine diesel engine pollutant treatment system and treatment method

Abstract

The present application provides a marine diesel engine pollution treatment system and treatment method, wherein the device comprises one or more exhaust branch pipes, an exhaust main pipe, one or more pollution treatment devices, reactor inlet pipes and an electrical control device; the one or more exhaust branch pipes are connected to the exhaust main pipe; the exhaust main pipe is connected to the pollution treatment devices through the reactor inlet pipes; an exhaust branch pipe valve is arranged on each of the exhaust branch pipes; an exhaust main pipe valve is arranged on the exhaust main pipe; a pressure sensor is arranged in the exhaust main pipe; a reactor inlet valve is arranged on each of the reactor inlet pipes; the exhaust main pipe valve, the pressure sensor, the reactor inlet valves and the pollution treatment devices are connected to the electrical control device. The present application can effectively treat the black smoke emission of multiple diesel engine test benches, so that the exhaust emission of the ship reaches the relevant regulations.

Description

Technical Field

[0001] This invention relates to the field of marine diesel engine technology, specifically to a marine diesel engine pollutant treatment system and method, applicable to the treatment of black smoke emissions from multi-diesel engine test benches. Background Technology

[0002] At the medium-speed diesel engine test base, many engines operate under low-load conditions, and their exhaust gases typically contain noticeable black smoke, failing to meet the emission reduction and environmental protection requirements of the Shanghai Municipal Environmental Protection Bureau's DB31 / 933-2015 "Integrated Emission Standard for Air Pollutants" and the International Maritime Organization's (IMO) Tier III NOx emission regulations.

[0003] As the best current option, the DOC+DPF+SCR (dual-stage aftertreatment system) is an excellent exhaust aftertreatment product used to treat particulate matter (PM), non-methane hydrocarbons (Nmethane), carbon monoxide (CO), and nitrogen oxides (NOx) generated by marine diesel engines. The treatment process for PM, Nmethane, and CO is as follows: Particulate matter is collected using a DPF filter, and under the action of a catalyst, over 85% of PM, Nmethane, and CO are removed through combustion at high exhaust temperatures. The NOx treatment process is as follows: A suitable amount of ammonia (usually a urea solution) is injected as a reducing agent into the exhaust gas. The ammonia and exhaust gas then mix and enter a reactor equipped with a catalyst module, where NOx is reduced to nitrogen and water under the action of the catalyst.

[0004] However, the pollutant treatment systems previously designed for multiple test sites were typically "one-unit-one-equipment," meaning each test site had its own treatment system. When the "one-unit-one-equipment" pollutant treatment system reached its capacity, the test site could not be tested and had to wait for the system to regenerate, severely impacting the test schedule. Furthermore, the frequent testing of a single test site would cause the exhaust gas treatment equipment of the "one-unit-one-equipment" system to depreciate more rapidly and age prematurely compared to other equipment in the same batch. Summary of the Invention

[0005] To address the aforementioned shortcomings in the prior art, this invention provides a marine diesel engine pollutant treatment system and method.

[0006] According to one aspect of the present invention, a marine diesel engine pollutant treatment system is provided, comprising: one or more discharge branch pipes, a discharge main pipe, one or more pollutant treatment devices, a reactor inlet pipe, and an electrical control device;

[0007] One or more of the discharge branch pipes are connected to the discharge main pipe;

[0008] The main discharge pipe is connected to the corresponding pollutant treatment device through the reactor inlet pipe;

[0009] Each of the aforementioned discharge branch pipes is equipped with a discharge branch pipe valve;

[0010] The main discharge pipe is equipped with a main discharge pipe valve;

[0011] A pressure sensor is installed in the main discharge pipe;

[0012] Each of the reactor inlet pipes is equipped with a reactor inlet valve;

[0013] The main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device are respectively connected to the electrical control device.

[0014] Preferably, the pollutant treatment device includes: a DOC+DPF reactor, an SCR reactor, a reducing agent supply module, and a blower; the inlet end of the DOC+DPF reactor is connected to the main discharge pipe through the reactor inlet pipe, the outlet end of the DOC+DPF reactor is connected to the inlet end of the SCR reactor, and the outlet end of the SCR reactor is connected to the blower; the reducing agent supply module is connected to the SCR reactor.

[0015] in:

[0016] The DOC+DPF reactor is used to remove particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide.

[0017] The SCR reactor is used to remove nitrogen oxides;

[0018] The reducing agent supply module is used to supply nitrogen oxide reducing agent to the SCR reactor;

[0019] The fan is used to provide static pressure to reduce the back pressure of the marine diesel engine pollutant treatment system.

[0020] Temperature sensors are installed at the inlet and outlet ends of the DOC+DPF reactor and the SCR reactor, respectively, and the temperature sensors are connected to the electrical control system.

[0021] Preferably, the reducing agent supply module includes a pump station and a metering unit, wherein the pump station supplies a set meter of nitrogen oxide reducing agent to the SCR reactor through the metering unit.

[0022] Preferably, the metering unit employs a PID controller, wherein the target injection amount of the reducing agent is set as the target amount of the PID controller, the real-time injection amount is the feedback amount of the PID controller, and the opening of the nitrogen oxide reducing agent supply regulating valve of the pumping station is controlled by the PID controller, thereby controlling the injection amount of the nitrogen oxide reducing agent.

[0023] Preferably, the electrical control device includes: a remote control terminal and a control box; wherein,

[0024] The remote control terminal is communicatively connected to the control box;

[0025] The control box is installed inside the ship's cabin and is connected to the main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device.

[0026] Preferably, the remote control terminal is a human-machine interface terminal, used to output remote control commands to the control box and to acquire system operation data for monitoring and storage.

[0027] Preferably, the control box includes: a central processing module, a signal acquisition module, and a communication module;

[0028] in:

[0029] The central processing module is used to control the operation of the main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device according to the remote control commands provided by the remote control terminal.

[0030] The signal acquisition module is used to acquire the pressure data collected by the pressure sensor;

[0031] The communication module is used to communicate with the remote control terminal.

[0032] Preferably, the communication module uses RS485 communication.

[0033] According to another aspect of the present invention, a method for treating pollutants from a marine diesel engine is provided, comprising:

[0034] Monitor the main exhaust manifold pressure; when the main exhaust manifold pressure reaches a set threshold, initiate the pollutant treatment process.

[0035] Select a pollutant treatment device and open the corresponding reactor inlet valve. The pollutants enter the pollutant treatment device for treatment.

[0036] Repeat the above process until the exhaust gas meets the emission quality requirements, thus completing this stage of marine diesel engine pollutant treatment.

[0037] Preferably, the pollutants enter the pollutant treatment device for treatment, including:

[0038] The pollutants are filtered to remove particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide before being output.

[0039] An SCR reactor is used to perform a catalytic reduction reaction of nitrogen oxides on filtered pollutants to remove nitrogen oxides.

[0040] The amount of reducing agent injected into the SCR reactor is automatically adjusted by the reducing agent supply module.

[0041] Preferably, when the main pipe pressure does not reach the set threshold, a blower is used to provide static pressure to reduce the back pressure of the marine diesel engine pollutant treatment system, thereby allowing the main pipe pressure to reach the set threshold.

[0042] By adopting the above technical solution, the present invention has at least one of the following beneficial effects compared with the prior art:

[0043] The marine diesel engine pollutant treatment system and method provided by this invention can switch to another treatment device when one pollutant treatment device needs catalyst regeneration by controlling the reactor inlet valve. By reasonably configuring the usage time of the equipment, the test bench can be effectively kept "forced to be idle", and individual equipment can be prevented from being "unevenly worn" by the test bench, thereby greatly reducing production and maintenance costs.

[0044] The marine diesel engine pollutant treatment system and method provided by this invention can effectively treat pollutant emissions from multiple diesel engine test benches, enabling ship exhaust emissions to meet relevant regulations.

[0045] The marine diesel engine pollutant treatment system and method provided by this invention determines whether to proceed to the next step or initiate other steps by monitoring the values ​​of sensors such as pressure, temperature, and NOx sensors, thereby achieving long-term reciprocating treatment during the exhaust gas emission process and effectively ensuring the quality of exhaust gas emissions. Attached Figure Description

[0046] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0047] Figure 1 This is a schematic diagram of the structure of a marine diesel engine pollutant treatment system according to an embodiment of the present invention.

[0048] Figure 2 This is a schematic diagram of the structure of a pollutant treatment device in a preferred embodiment of the present invention.

[0049] Figure 3 This is a control principle diagram of a marine diesel engine pollutant treatment system in a preferred embodiment of the present invention.

[0050] Figure 4 This is a flowchart illustrating the process of a marine diesel engine pollutant treatment method according to an embodiment of the present invention.

[0051] Figure 5 This is a flowchart illustrating the process of a marine diesel engine pollutant treatment method according to a preferred embodiment of the present invention.

[0052] In the diagram, 1 is the exhaust branch valve, 2 is the exhaust main valve, 3 is the pollutant treatment device, 4 is the reactor inlet valve, 5 is the DOC+DPF reactor, 6 is the SCR reactor, 7 is the pump station, 8 is the metering unit, and 9 is the fan. Detailed Implementation

[0053] The embodiments of the present invention are described in detail below: These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

[0054] Figure 1 This is a schematic diagram of a marine diesel engine pollutant treatment system provided in an embodiment of the present invention. Figure 3 This is a control principle diagram of a marine diesel engine pollutant treatment system in a preferred embodiment of the present invention.

[0055] like Figure 1 and Figure 3 As shown, the marine diesel engine pollutant treatment system provided in this embodiment may include: one or more discharge branch pipes, a discharge main pipe, one or more pollutant treatment devices, a reactor inlet pipe, and an electrical control device;

[0056] One or more branch pipes are connected to the main discharge pipe;

[0057] The main discharge pipe is connected to the corresponding pollutant treatment device through the reactor inlet pipe;

[0058] Each discharge branch pipe is equipped with a discharge branch pipe valve;

[0059] The main discharge pipe is equipped with a main discharge pipe valve;

[0060] A pressure sensor is installed in the main discharge pipe;

[0061] Each reactor inlet pipe is equipped with a reactor inlet valve;

[0062] The main discharge valve, pressure sensor, reactor inlet valve, and pollutant treatment device are each connected to the electrical control device.

[0063] like Figure 2As shown, in this embodiment, as a preferred embodiment, the pollutant treatment device includes: a DOC+DPF reactor, an SCR reactor, a reducing agent supply module, and a blower; the inlet end of the DOC+DPF reactor is connected to the main discharge pipe through the reactor inlet pipe, the outlet end of the DOC+DPF reactor is connected to the inlet end of the SCR reactor, and the outlet end of the SCR reactor is connected to the blower; the reducing agent supply module is connected to the SCR reactor.

[0064] in:

[0065] DOC+DPF reactor is used to remove particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide.

[0066] SCR reactor, used to remove nitrogen oxides;

[0067] The reducing agent supply module is used to supply nitrogen oxide reducing agent to the SCR reactor;

[0068] Fans are used to provide static pressure to reduce the back pressure of marine diesel engine pollutant treatment systems;

[0069] Temperature sensors are installed at the inlet and outlet ends of the DOC+DPF reactor and the SCR reactor, respectively, and the temperature sensors are connected to the electrical control system.

[0070] In this embodiment, as a preferred embodiment, the reducing agent supply module includes a pump station and a metering unit, the pump station supplying a set metered amount of nitrogen oxide reducing agent to the SCR reactor through the metering unit.

[0071] In this embodiment, as a preferred embodiment, the metering unit adopts a PID controller, wherein the target reducing agent injection amount is set as the target amount of the PID controller, the real-time injection amount is the feedback amount of the PID controller, and the opening of the nitrogen oxide reducing agent supply line regulating valve of the pump station is controlled by the PID controller, thereby controlling the injection amount of nitrogen oxide reducing agent.

[0072] In this embodiment, as a preferred embodiment, the electrical control device includes: a remote control terminal and a control box; wherein,

[0073] The remote control terminal communicates with the control box.

[0074] The control box is installed inside the ship's cabin and is connected to the main discharge valve, pressure sensor, reactor inlet valve, and pollutant treatment device.

[0075] In this embodiment, as a preferred embodiment, the remote control terminal adopts a human-machine interaction terminal, which is used to output remote control commands to the control box and acquire system operation data for monitoring and storage.

[0076] In this embodiment, as a preferred embodiment, the control box includes: a central processing module, a signal acquisition module, and a communication module;

[0077] in:

[0078] The central processing module is used to control the operation of the discharge main valve, pressure sensor, reactor inlet valve and pollutant treatment device according to the remote control instructions provided by the remote control terminal;

[0079] The signal acquisition module is used to acquire the pressure data collected by the pressure sensor;

[0080] The communication module is used to communicate with the remote control terminal.

[0081] In this embodiment, as a preferred embodiment, the communication module adopts RS485 communication.

[0082] The marine diesel engine pollutant treatment system provided in the above embodiments of the present invention has the following main structure: Figure 1 As shown, it includes:

[0083] An exhaust branch pipe is provided with an exhaust branch pipe valve 1.

[0084] The exhaust manifold is equipped with an exhaust manifold valve 2.

[0085] Pollutant treatment device 3 for pollutant treatment;

[0086] The reactor inlet pipe is equipped with a reactor inlet valve 4.

[0087] in:

[0088] like Figure 2 As shown, the pollutant treatment device 3 includes:

[0089] DOC+DPF reactor 5 for removing particulate matter (PM), non-methane total hydrocarbons and carbon monoxide;

[0090] SCR reactor 6 for removing nitrogen oxides;

[0091] A reducing agent supply module for supplying reducing agent to SCR reactor 6, the module including pump station 7 and metering unit 8;

[0092] Fan 9 is used to provide static pressure throughout the system to reduce the back pressure of the entire system.

[0093] The control principle of the marine diesel engine pollutant treatment system provided in the above embodiments of the present invention is as follows: Figure 3As shown. The remote control terminal of the electrical control system is installed in the central control room. This remote control terminal provides a human-machine interface, enabling remote operation, control, parameter monitoring, and storage of the system. The remote control terminal controls a control box installed in the ship's cabin. This control box contains a central processing module (control CPU), a signal acquisition module, and a communication module (such as an RS485 communication module). It is used for communication with the remote control terminal and for controlling field valves and acquiring sensor signals. It has command output and equipment signal feedback acquisition functions and connects to the main structure of the marine diesel engine pollutant treatment system.

[0094] Figure 4 This is a flowchart illustrating the process of a marine diesel engine pollutant treatment method according to an embodiment of the present invention.

[0095] like Figure 4 As shown, the marine diesel engine pollutant treatment method provided in this embodiment may include the following steps:

[0096] S100 monitors the main exhaust manifold pressure. When the main exhaust manifold pressure reaches a set threshold, the pollutant treatment procedure is initiated.

[0097] S200: Select the pollutant treatment device and open the corresponding reactor inlet valve. The pollutants enter the pollutant treatment device for treatment.

[0098] S300, repeat the above process until the exhaust gas meets the emission quality requirements, thus completing this stage of marine diesel engine pollutant treatment.

[0099] In S200 of this embodiment, as a preferred embodiment, the process of treating pollutants by introducing them into a pollutant treatment device may include the following steps:

[0100] S201 uses a DOC+DPF reactor to filter out particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide from pollutants before outputting them.

[0101] S202 uses an SCR reactor to perform a catalytic reduction reaction of nitrogen oxides on filtered pollutants to remove nitrogen oxides;

[0102] The amount of reducing agent injected into the SCR reactor is automatically adjusted by the reducing agent supply module.

[0103] In S100 of this embodiment, as a preferred embodiment, when the main pipe pressure does not reach the set threshold, a blower is used to provide static pressure to reduce the back pressure of the marine diesel engine pollutant treatment system, thereby making the main pipe pressure reach the set threshold.

[0104] In S100 of this embodiment, as a specific application example, the set threshold for the main pipe pressure can be 3.1 kPa.

[0105] It should be noted that the steps in the method provided by the present invention can be implemented using corresponding modules, devices, units, etc. in the system. Those skilled in the art can refer to the technical solution of the system to implement the steps and flow of the method. That is, the embodiments in the system can be understood as preferred examples of the method, and will not be elaborated here.

[0106] The working steps of the marine diesel engine pollutant treatment method provided in the above embodiments of the present invention are further described below with reference to the marine diesel engine pollutant treatment system provided in the above embodiments of the present invention.

[0107] like Figure 5 As shown, the marine diesel engine pollutant treatment method provided in the above embodiments of the present invention includes the following important working steps: preparation step, selection of emission reduction system step, particulate matter removal step, preheating step, nitrogen oxide removal step, etc. In addition, it also includes auxiliary steps such as sensor monitoring.

[0108] Preparation steps: The exhaust gas emitted from the test area enters the main exhaust pipe through each exhaust branch pipe and branch pipe valve. During this process, it is necessary to monitor whether the main pipe pressure reaches the preset value. If so, VBR is turned on and the next step is executed; if not, the fan frequency needs to be adjusted to provide static pressure to the entire system to reduce the back pressure of the entire system.

[0109] Steps for selecting an emission reduction system: The medium-speed engine test base has multiple test areas. Depending on the test status of each test area, the branch valve on the exhaust branch pipe of that test area is opened by the remote control terminal control box. After the flue gas passes through the exhaust main pipe, the valve control system of the control box opens the reactor inlet valve VBR and enters the selected pollutant treatment device (i.e., the emission reduction system in the figure).

[0110] Particulate matter removal steps: The flue gas emitted from the test area is controlled by the valve control system in the control box and enters the selected pollutant treatment device. After passing through the DOC+DPF reactor, particulate matter is collected by the DPF filter. Under the action of the catalyst, more than 85% of PM, non-methane total hydrocarbons and carbon monoxide are removed by combustion using the high temperature of the exhaust gas.

[0111] Preheating step: The flue gas catalytically filtered by the DOC+DPF reactor enters the SCR reactor. During this process, it is necessary to monitor whether the inlet and outlet temperatures of the reactor have reached the preset temperature. If so, proceed to the next step.

[0112] Nitrogen oxide removal process: After particulate matter is removed by the DOC+DPF reactor, the flue gas enters the SCR reactor. The reducing agent supply module provides reducing agent (urea) into the SCR reactor according to a preset value. The flue gas undergoes catalytic reduction by the reducing agent, treating the flue gas in the reactor. Specifically, at this point, the flue gas temperature meets the SCR operating requirements. As the flue gas passes through the SCR reactor, the reducing agent injection rate of the reducing agent supply unit (pump station 7, metering unit 8) is automatically adjusted according to a PID control method. The target reducing agent injection rate is set as the target value for the PID controller, the real-time injection rate is the feedback value for the PID controller, and the output value of the PID controller is the input value for the reducing agent supply path regulating valve of the reducing agent supply module, thereby controlling the reducing agent injection rate. After passing through the SCR reactor, the flue gas is discharged through the fan unit. A NOx sensor is installed at the fan outlet to monitor the nitrogen oxide content of the discharged flue gas. If it exceeds the preset value, the reducing agent injection rate will be increased to meet the flue gas emission requirements.

[0113] The DOC+DPF reactor is connected to the flue gas duct, and the SCR reactor is connected to the DOC+DPF reactor, the reducing agent supply module, and the fan. Through the valve control system, sensor monitoring, and the coordination between various modules, long-term reciprocating treatment of flue gas is achieved, effectively ensuring the quality of exhaust gas emissions.

[0114] The marine diesel engine pollutant treatment system and method provided in the above embodiments of the present invention can effectively treat the black smoke emissions from multiple diesel engine test benches, so that the ship's exhaust emissions meet the relevant regulations.

[0115] Any matters not covered in the above embodiments of the present invention are well-known in the art.

[0116] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A marine diesel engine pollutant treatment system, characterized in that, include: One or more discharge branch pipes, one discharge main pipe, one or more pollutant treatment devices, reactor inlet pipes, and electrical control devices; One or more of the discharge branch pipes are connected to the discharge main pipe; The main discharge pipe is connected to the corresponding pollutant treatment device through the reactor inlet pipe; Each of the aforementioned discharge branch pipes is equipped with a discharge branch pipe valve; The main discharge pipe is equipped with a main discharge pipe valve; A pressure sensor is installed in the main discharge pipe; Each of the reactor inlet pipes is equipped with a reactor inlet valve; The main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device are respectively connected to the electrical control device; When one of the pollutant treatment units requires catalyst regeneration, the reactor inlet valve is controlled to switch to another pollutant treatment unit. The usage time of the equipment is configured to avoid the test bench being forced to be idle and / or the pollutant treatment unit being consumed by the test bench.

2. The marine diesel engine pollutant treatment system according to claim 1, characterized in that, The pollutant treatment device includes: a DOC+DPF reactor, an SCR reactor, a reducing agent supply module, and a blower; the inlet end of the DOC+DPF reactor is connected to the main discharge pipe through the reactor inlet pipe, the outlet end of the DOC+DPF reactor is connected to the inlet end of the SCR reactor, and the outlet end of the SCR reactor is connected to the blower; the reducing agent supply module is connected to the SCR reactor. in: The DOC+DPF reactor is used to remove particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide. The SCR reactor is used to remove nitrogen oxides; The reducing agent supply module is used to supply nitrogen oxide reducing agent to the SCR reactor; The fan is used to provide static pressure to reduce the back pressure of the marine diesel engine pollutant treatment system. Temperature sensors are installed at the inlet and outlet ends of the DOC+DPF reactor and the SCR reactor, respectively, and the temperature sensors are connected to the electrical control device.

3. The marine diesel engine pollutant treatment system according to claim 2, characterized in that, The reducing agent supply module includes a pump station and a metering unit. The pump station supplies a set meter of nitrogen oxide reducing agent to the SCR reactor through the metering unit.

4. The marine diesel engine pollutant treatment system according to claim 3, characterized in that, The metering unit employs a PID controller, wherein the target injection amount of the reducing agent is set as the target amount of the PID controller, and the real-time injection amount is the feedback amount of the PID controller. The PID controller controls the opening of the nitrogen oxide reducing agent supply regulating valve of the pumping station, thereby controlling the injection amount of the nitrogen oxide reducing agent.

5. The marine diesel engine pollutant treatment system according to claim 1, characterized in that, The electrical control device includes: a remote control terminal and a control box; wherein, The remote control terminal is communicatively connected to the control box; The control box is installed inside the ship's cabin and is connected to the main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device.

6. The marine diesel engine pollutant treatment system according to claim 5, characterized in that, The remote control terminal is a human-machine interface terminal, used to output remote control commands to the control box and to acquire system operation data for monitoring and storage; The control box includes: a central processing module, a signal acquisition module, and a communication module; in: The central processing module is used to control the operation of the main discharge valve, the pressure sensor, the reactor inlet valve, and the pollutant treatment device according to the remote control commands provided by the remote control terminal. The signal acquisition module is used to acquire the pressure data collected by the pressure sensor; The communication module is used to communicate with the remote control terminal.

7. The marine diesel engine pollutant treatment system according to claim 6, characterized in that, The communication module uses RS485 communication.

8. A method for treating marine diesel engine pollutants using the marine diesel engine pollutant treatment system according to any one of claims 1-7, characterized in that, include: Monitor the main exhaust manifold pressure; when the main exhaust manifold pressure reaches a set threshold, initiate the pollutant treatment process. Select a pollutant treatment device and open the corresponding reactor inlet valve. The pollutants enter the pollutant treatment device for treatment. Repeat the above process until the exhaust gas meets the emission quality requirements, thus completing this stage of marine diesel engine pollutant treatment.

9. The method for treating pollutants from marine diesel engines according to claim 8, characterized in that, The pollutants enter the pollutant treatment device for treatment, including: The pollutants are filtered to remove particulate matter (PM), non-methane total hydrocarbons, and carbon monoxide before being output. An SCR reactor is used to perform a catalytic reduction reaction of nitrogen oxides on filtered pollutants to remove nitrogen oxides. The amount of reducing agent injected into the SCR reactor is automatically adjusted by the reducing agent supply module.

10. The method for treating pollutants from marine diesel engines according to claim 8, characterized in that, When the main pipe pressure does not reach the set threshold, a blower is used to provide static pressure to reduce the back pressure of the marine diesel engine pollutant treatment system, thereby enabling the main pipe pressure to reach the set threshold.

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