Self-adaptive control system and method applied to post-treatment of ammonia engine

Abstract

The invention discloses a self-adaptive control system and method applied to aftertreatment of an ammonia engine, and belongs to the technical field of engine tail gas treatment. The control system comprises a gas catalyst and a particle capturing device, the outlet end of the particle capturing device is connected with a denitration-ammonia removal treatment device, and the gas catalyst, the particle capturing device and the denitration-ammonia removal treatment device are sequentially connected to the rear end of an exhaust port of an ammonia engine. The gas catalyst, the particle capturing device and the denitration-ammonia removal treatment device are all arranged on the main pipeline, and a bypass pipeline is arranged on the main pipeline in parallel. The bypass pipeline is arranged on the main pipeline in parallel, the bypass pipeline assists in treating waste gas discharged by the ammonia engine, and the bypass pipeline and the denitration-ammonia removal treatment device are used for cancelling application of a urea injection system; the amount of waste gas passing through the gas catalytic converter and the bypass pipeline is dynamically and adaptively adjusted according to the conditions of the load of the ammonia engine, the unburned ammonia and the like, so that emission of the unburned ammonia, NOx and the like meets regulatory limits.

Description

Technical Field

[0001] The present invention belongs to the technical field of engine exhaust treatment, and more specifically, relates to an adaptive control system and method for after-treatment of an ammonia engine. Background Art

[0002] Considering the zero-carbon characteristics of ammonia fuel, ammonia fuel engines will have important application value in the future fields of ships and power generation. However, the emission characteristics of ammonia fuel engines are different from those of previous diesel and gasoline engines. Attention should be paid to emissions such as unburned ammonia, NOx and laughing gas. There is still no mature application solution. The traditional diesel engine SCR system requires external spraying of urea solution as a reducing agent, which has problems such as urea crystallization, high storage and transportation costs, and low-temperature failure. In addition, due to incomplete combustion in the cylinder of the ammonia fuel engine, there is a certain concentration of ammonia in the emissions, which can replace the urea of ​​the selective catalytic reducer (SCR). However, an oxidation catalyst (DOC) is generally installed in front of the SCR. After the DOC, the ammonia concentration will be greatly reduced, making it difficult to support the use of the SCR.

[0003] Therefore, it is necessary to modify the emission system according to the characteristics of ammonia fuel engines in order to optimize the after-treatment system of the ammonia engine and optimize emissions such as unburned ammonia while avoiding adding a urea injection system. Summary of the invention

[0004] The present invention aims at solving the technical problems existing in the prior art and provides an adaptive control system and method for aftertreatment of an ammonia engine.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] An adaptive control system applied to aftertreatment of an ammonia engine comprises a gas catalyst and a particulate capture device, wherein the outlet end of the particulate capture device is connected to a denitration-ammonia removal treatment device, the gas catalyst, the particulate capture device and the denitration-ammonia removal treatment device are sequentially connected to the rear end of the exhaust port of the ammonia engine, and the gas catalyst, the particulate capture device and the denitration-ammonia removal treatment device are all arranged on a main pipe, and a bypass pipe is arranged in parallel on the main pipe.

[0007] Preferably, the gas catalyst includes an oxidation catalyst, the particulate capture device includes a particulate trap, the inlet end of the oxidation catalyst is connected to the exhaust end of the ammonia engine, the outlet end of the oxidation catalyst is connected to the particulate trap, and the bypass line is arranged in parallel with the oxidation catalyst and the particulate trap.

[0008] Preferably, the first end of the bypass line is connected to the inlet end of the gas catalyst, the second end of the bypass line is connected to the inlet end of the denitrification-ammonia removal treatment device, and the inlet end of the bypass line is connected to the exhaust end of the ammonia engine.

[0009] Preferably, ammonia in the exhaust gas in the bypass line is used as a reducing agent for the denitration-ammonia removal treatment device.

[0010] Preferably, the denitration-ammonia removal treatment device is arranged in series with the main pipeline and the bypass pipeline, and the denitration-ammonia removal treatment device includes a selective catalytic reducer, and the selective catalytic reducer is connected to the outlet end of the particulate capture device.

[0011] Preferably, the denitration-ammonia removal treatment device further includes an ammonia oxidation catalyst, which is connected to the selective catalytic reducer.

[0012] Preferably, control valves are provided on both the main pipeline and the bypass pipeline, the outlet end of the main pipeline is connected to a post-processing controller, the ammonia engine is connected to an engine controller, and the engine controller is electrically connected to the post-processing controller.

[0013] Preferably, the inlet ends of the main pipeline and the bypass pipeline are both provided with control valves, the control valves are electrically controlled opening valves, and the post-processing controller controls the movement of the control valves.

[0014] Preferably, a gas monitoring sensor is connected to the outlet end of the main pipeline, the gas monitoring sensor is connected to the post-processing controller, the gas monitoring sensor is arranged at the outlet exhaust end of the denitrification-ammonia removal treatment device, and the gas monitoring sensor includes an ammonia concentration sensor and a NOx concentration sensor.

[0015] Furthermore, the present invention also provides an adaptive control method for ammonia engine post-treatment, comprising the following steps:

[0016] During the operation of the ammonia engine, the exhaust gas containing unburned ammonia is divided into two paths. The first path of unburned ammonia enters the oxidation catalyst through the first electronically controlled opening valve for oxidation treatment, and the second path of unburned ammonia is transported to the selective catalytic reduction device through the bypass pipeline as a reducing agent.

[0017] The selective catalytic reduction device uses the second unburned ammonia to reduce the NOx in the exhaust gas, and then transports the residual ammonia to the ammonia oxidation catalyst for oxidation elimination;

[0018] The soot particles in the first exhaust gas are captured by a particulate collector;

[0019] The engine controller obtains the working load information in real time and transmits it to the post-processing controller for feedforward control, and generates the initial opening instructions of the first electronically controlled opening valve and the second electronically controlled opening valve based on the table lookup method;

[0020] The ammonia concentration sensor and the NOx concentration sensor are used to monitor the ammonia concentration and NOx concentration at the outlet of the ammonia oxidation catalyst in real time, and the feedback is fed back to the post-treatment controller and integrated with the adaptive algorithm to adjust the opening of the first electronically controlled opening valve and the second electronically controlled opening valve in real time to make the unburned ammonia and NOx emissions meet the preset thresholds.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention arranges a bypass line in parallel with the main line to assist in treating the exhaust gas emitted by the ammonia engine through the bypass line, and eliminates the use of the urea injection system by utilizing the bypass line and the denitration-ammonia removal treatment device. The amount of exhaust gas passing through the gas catalyst and the bypass line is dynamically and adaptively adjusted according to the load of the ammonia engine and the unburned ammonia, so that the emissions of unburned ammonia, NOx, etc. meet the regulatory restrictions. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 A system schematic diagram of an embodiment of an adaptive control system for ammonia engine post-treatment provided by the present invention;

[0025] Figure 2 A schematic diagram of the structure of an embodiment of an adaptive control system for ammonia engine post-treatment provided by the present invention;

[0026] Figure 3 This is a logic control flow chart of an embodiment of the control method of the present invention.

[0027] Explanation of symbols in the figure:

[0028] 1. Gas catalyst; 101. Oxidation catalyst; 2. Particle capture device; 201. Particle trap; 3. Denitrification-ammonia removal treatment device; 4. Ammonia engine; 5. Main line; 6. Bypass line; 7. Selective catalytic reduction device; 8. Ammonia oxidation catalyst; 9. First electronically controlled opening valve; 10. Second electronically controlled opening valve; 11. Engine controller; 12. Aftertreatment controller; 13. Ammonia concentration sensor; 14. NOx concentration sensor. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the following is a further detailed description of an adaptive control system and method for ammonia engine post-treatment provided by the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0030] Example 1

[0031] See also Figure 1 The present embodiment provides an adaptive control system for aftertreatment of an ammonia engine, comprising a gas catalyst 1 and a particulate capture device 2. The outlet end of the particulate capture device 2 is connected to a denitration-ammonia removal treatment device 3. The gas catalyst 1, the particulate capture device 2 and the denitration-ammonia removal treatment device 3 are sequentially connected to the rear end of the exhaust port of an ammonia engine 4, and the gas catalyst 1, the particulate capture device 2 and the denitration-ammonia removal treatment device 3 are all arranged on a main pipeline 5, and a bypass pipeline 6 is arranged in parallel on the main pipeline 5.

[0032] The present invention arranges a bypass line 6 in parallel with the main line 5, and assists in treating the exhaust gas discharged by the ammonia engine 4 through the bypass line 6. The bypass line 6 and the denitrification-ammonia removal treatment device 3 are used to cancel the use of the urea injection system, and dynamically and adaptively adjust the amount of exhaust gas passing through the gas catalyst 1 and the bypass line 6 according to the load of the ammonia engine 4 and the unburned ammonia, so that the emissions of unburned ammonia, NOx, etc. meet the regulatory restrictions.

[0033] In this embodiment, the main pipeline 5 is provided with a first end as an inlet end and a second end as an outlet end, the first end of the main pipeline 5 is connected to the exhaust port of the ammonia engine 4, and the second end of the main pipeline 5 is connected to the emission end of the system; the bypass pipeline 6 is provided with a first end as an inlet end and a second end as an outlet end, the first end of the bypass pipeline 6 is connected to the inlet end of the gas catalyst 1, and the first end is arranged at the rear end of the exhaust port of the ammonia engine 4, the inlet end of the bypass pipeline 6 is connected to the exhaust end of the ammonia engine 4, the second end of the bypass pipeline 6 is arranged at the front end of the system emission end, and the second end of the bypass pipeline 6 is connected to the inlet end of the denitrification-ammonia removal treatment device 3.

[0034] Specifically, Figure 1 , Figure 2 As shown, the gas catalyst 1 includes an oxidation catalyst 101, and the particulate capture device 2 includes a particulate trap 201. The inlet end of the oxidation catalyst 101 is connected to the exhaust end of the ammonia engine 4, and the outlet end of the oxidation catalyst 101 is connected to the particulate trap 201. The bypass line 6 is arranged in parallel with the oxidation catalyst 101 and the particulate trap 201, and the oxidation catalyst 101, the particulate trap 201 and the denitrification-ammonia removal treatment device 3 are arranged in series on the main line 5 from front to back.

[0035] The denitrification-ammonia removal treatment device 3 is arranged in series with the main pipeline 5 and the bypass pipeline 6. The denitrification-ammonia removal treatment device 3 includes a selective catalytic reducer 7 and an ammonia oxidation catalyst 8. The selective catalytic reducer 7 is connected to the particulate trap 201 and the outlet end of the bypass pipeline 6, and the ammonia oxidation catalyst 8 is arranged at the rear end of the selective catalytic reducer 7, and the ammonia oxidation catalyst 8 is connected to the outlet end of the selective catalytic reducer 7.

[0036] Furthermore, the inlet ends of the main pipeline 5 and the bypass pipeline 6 are both provided with control valves, and the control valves are electrically controlled opening valves.

[0037] Specifically, a first electrically controlled opening valve 9 is provided on the main pipeline 5, and the first opening valve 9 is arranged at the front end of the inlet of the oxidation catalyst 101. A second electrically controlled opening valve 10 is provided on the bypass pipeline 6, and the second electrically controlled opening valve 10 is arranged at the inlet end of the bypass pipeline 6. The first electrically controlled opening valve 9 and the second electrically controlled opening valve 10 respectively control the exhaust gas flow passing through the oxidation catalyst 101 and the bypass pipeline 6.

[0038] In this embodiment, the ammonia engine 4 is connected to an engine controller 11, and the outlet end of the main pipeline 5 is connected to a post-processing controller 12. The post-processing controller 12 is arranged at the outlet rear end of the ammonia oxidation catalyst 8, and the post-processing controller 12 is electrically connected to the engine controller 11 to receive the operating condition information of the ammonia engine 4.

[0039] The first electrically controlled opening valve 9 and the second electrically controlled opening valve 10 are both connected to a post-processing controller 12 , and the post-processing controller 12 controls the valve actions.

[0040] Furthermore, in this embodiment, the outlet end of the main pipe 5 is connected to a gas monitoring sensor, which is installed at the exhaust rear end of the ammonia oxidation catalyst 8, and is connected to the post-processing controller 12 as an input signal of the controller. The gas monitoring sensor includes an ammonia concentration sensor 13 and a NOx concentration sensor 14, and the concentration of unburned ammonia and NOx at the exhaust terminal is monitored by the gas monitoring sensor, and the final emission data is monitored in real time and fed back to the post-processing controller.

[0041] In this embodiment, ammonia in the exhaust gas in the bypass line 6 is used as a reducing agent for the selective catalytic reducer 7. The post-treatment controller 12 adaptively adjusts the control valve ratio according to the unburned ammonia and NOx emissions at the terminal, and uses the load information of the ammonia engine 4 as feedforward to optimize the ammonia engine emissions.

[0042] Furthermore, as a preferred embodiment of the present invention, the working mode of the ammonia engine 4 adopts an ammonia-diesel dual-fuel mode.

[0043] Furthermore, in this embodiment, the system includes a deoxidation catalyst (DOC), a particulate filter (DPF), a selective catalytic reduction (SCR), and an ammonia oxidation catalyst (ASC).

[0044] In this embodiment, the exhaust pipe of the ammonia engine is divided into two pipes:

[0045] Main route: exhaust gas flows through the first electronically controlled opening valve → DOC → DPF → SCR → ASC in sequence;

[0046] Bypass: The exhaust gas passes through the second electronically controlled opening valve → bypass pipeline directly connected to the SCR inlet.

[0047] In this embodiment, an oxidation catalyst 101 and a bypass line 6 are connected in parallel, and electronically controlled opening valves are respectively provided at the front ends of the lines to realize the diversion of unburned ammonia in the exhaust gas discharged by the ammonia engine. The first path is oxidized through the oxidation catalyst 101, and the second path is used as a reducing agent for a selective catalytic reducer 7 through the bypass line 6. By providing an ammonia oxidation catalyst 8 downstream of the selective catalytic reducer 7, residual ammonia in the exhaust gas can be eliminated. A particulate trap 201 is arranged at the rear end of the oxidation catalyst 101 to trap carbon soot particles.

[0048] Example 2

[0049] like Figure 3 As shown, this embodiment provides an adaptive control method for ammonia engine post-treatment, comprising the following steps:

[0050] S1. During the operation of the ammonia engine 4, the exhaust gas containing unburned ammonia is divided into two paths. The first path of unburned ammonia enters the oxidation catalyst 101 through the first electronically controlled opening valve 9 for oxidation treatment, and the second path of unburned ammonia is transported to the selective catalytic reduction device 7 through the bypass pipe 6 as a reducing agent;

[0051] S2, the selective catalytic reduction device 7 uses the second unburned ammonia to reduce the NOx in the exhaust gas, and then transports the residual ammonia to the ammonia oxidation catalyst 8 for oxidation elimination;

[0052] S3, trapping soot particles in the first exhaust gas through the particle trap 201;

[0053] S4, obtaining the working load information in real time through the engine controller 11 and transmitting it to the post-processing controller 12 for feedforward control, and generating the initial opening instructions of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 based on the table lookup method;

[0054] Among them, the opening table of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 under different working conditions is obtained through experimental calibration, the input data of the table is the speed, load and ammonia fuel substitution rate, and the output data is the opening value of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10; the dynamic characteristics of the after-treatment device can be enhanced through feedforward control based on the table lookup method, avoiding the possibility of high emissions caused by dynamic switching of the engine.

[0055] S5. The ammonia concentration and NOx concentration at the outlet of the ammonia oxidation catalyst 8 are monitored in real time through the ammonia concentration sensor 13 and the NOx concentration sensor 14, and the feedback is sent to the post-treatment controller 12 and integrated with the adaptive algorithm to adjust the opening of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 in real time, so that the unburned ammonia and NOx emissions meet the preset thresholds.

[0056] In this embodiment, the adaptive algorithm adopts a PID algorithm based on fuzzy control. Taking into account that the proportional, integral and differential coefficients of PID vary under different operating conditions, in order to improve the precise and stable control of the engine within the full operating range, the PID proportional, integral and differential coefficients under different operating conditions are obtained through a fuzzy algorithm, and then the closed-loop control of the first electronically controlled opening valve and the second electronically controlled opening valve is further realized based on the PID algorithm.

[0057] The ammonia concentration sensor 13 monitors the concentration of unburned ammonia at the outlet of the ammonia oxidation catalyst 8, reflecting the utilization rate of the reducing agent, and the NOx concentration sensor 14 monitors the NOx concentration at the outlet, indicating the gas purification effect. The signal information of the two sensors is transmitted to the post-processing controller 12 as the input of the fuzzy PID algorithm. The first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 cooperate with each other to achieve the dynamic response of the main flow regulation and auxiliary compensation of the pipeline, and the two valves are coordinated and controlled. The two independently adjust the parameters through the fuzzy PID algorithm to form a complementary control strategy.

[0058] In this embodiment, the exhaust gas discharged by the ammonia engine contains unburned ammonia, etc., a part of the unburned ammonia passes through the first electronically controlled opening valve 9 and enters the oxidation catalyst 101 to be oxidized, and another part of the unburned ammonia flows directly to the selective catalytic reduction device 7 through the bypass line 6 as a reducing agent to reduce the NOx concentration, etc.; the residual ammonia after being treated by the selective catalytic reduction device 7 is oxidized by the ammonia oxidation catalyst 8 to further reduce the ammonia concentration and achieve the emission control of unburned ammonia. At the same time, a part of the unburned ammonia is used as a reducing agent to replace the urea injection system of the SCR. Since the ammonia engine 4 adopts the dual fuel mode of ammonia-diesel, the emission of soot particles in the exhaust gas of the ammonia engine 4 is reduced by connecting the particulate filter 201 at the rear end of the oxidation catalyst 101.

[0059] Furthermore, the control process of this embodiment includes:

[0060] Feedforward control stage: the engine controller communicates with the post-processing controller to transmit feedforward signals such as speed and load;

[0061] The engine controller transmits the real-time data of the current ammonia engine to the post-processing controller, and the post-processing controller calls the pre-stored mapping table, matches the corresponding electronically controlled opening valve opening reference value from the pre-stored database, and sets the initial opening of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10.

[0062] The adjustment range of the first electronically controlled opening valve 9 is 0%-100%. When the detection value of the ammonia concentration sensor 13 exceeds a specified threshold, the opening of the second electronically controlled opening valve 10 is increased to increase the ammonia supply to the selective catalytic reducer 7 .

[0063] Feedback correction stage: the ammonia concentration sensor 13 detects the ammonia concentration at the outlet of the ammonia oxidation catalyst 8 and the detection value of the NOx concentration sensor;

[0064] The post-processing controller 12 starts the PID algorithm, calculates the opening valve adjustment amount, and increases the ammonia supply to the selective catalytic reduction device 7; and then continues to monitor until the ammonia concentration in the exhaust gas drops below the specified level.

[0065] For example: in the feedforward control stage, the initial opening of the first electronically controlled opening valve is set to 40%, and the initial opening of the second electronically controlled opening valve is set to 60%. In the feedback correction stage, the ammonia concentration sensor detects that the ammonia concentration at the ASC outlet is 8ppm (exceeding the limit value by 5ppm). The after-treatment controller calculates the opening valve adjustment amount, reduces the opening of the first electronically controlled opening valve to 35%, increases the second electronically controlled opening valve to 65%, increases the SCR ammonia supply, and continues to monitor until the ammonia concentration is ≤5ppm and the NOx concentration meets the requirements.

[0066] Furthermore, as a preferred embodiment of the present invention, the adaptive algorithm adopted by the post-treatment controller 12 may be a PID control algorithm or a model predictive control algorithm (MPC), and the adjustment priority satisfies that the ammonia slip control is higher than the NOx reduction efficiency control.

[0067] Furthermore, in the dual-fuel mode adaptation mode, when the ammonia fuel substitution rate increases from 70% to 90%, the post-processing controller 12 adjusts the mapping table according to the feedforward information to increase the reference opening of the second electronically controlled opening valve 10 (for example, from 50% to 70%).

[0068] The present invention provides an adaptive control system and method for ammonia engine post-treatment, which can be applied to the post-treatment system of ammonia-diesel dual-fuel engines such as ships and heavy trucks, to achieve post-treatment adaptive adjustment applicable to all working conditions and meet standard emission requirements. The present invention uses unburned ammonia to replace external urea spraying, reduces system complexity and operating costs, balances ammonia slip and NOx reduction efficiency through shunt control, and combines a feedforward-feedback composite control algorithm to achieve emission closed-loop optimization; at the same time, by arranging the particulate filter and the catalyst in a coordinated manner, it adapts to the particulate matter and gaseous pollutant treatment requirements of ammonia-diesel dual fuel.

[0069] The present invention arranges a bypass line 6 in parallel with the main line 5 to assist in treating the exhaust gas emitted by the ammonia engine through the bypass line 6. In view of the emission characteristics of the ammonia engine, the use of the bypass line 6 and the denitrification-ammonia removal treatment device 3 is used to cancel the use of the urea injection system, and the amount of exhaust gas passing through the gas catalyst and the bypass line is adaptively adjusted according to the ammonia engine load and unburned ammonia. The entire post-treatment link is optimized, so that the emissions of unburned ammonia, NOx, etc. meet the regulatory restrictions.

[0070] Moreover, the present invention utilizes feedforward + feedback composite control to control the system, and transmits the operating load information to the post-processing controller 12 through the engine controller 11 as feedforward control. The post-processing controller 12 sets the initial opening of the current first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 by table lookup method according to the feedforward information, and then integrates the adaptive algorithm based on the real-time monitoring feedback information data of the ammonia concentration sensor 13 and the NOx concentration sensor 14 of the terminal, and adjusts the opening ratio of the first electronically controlled opening valve 9 and the second electronically controlled opening valve 10 in real time, so that the emissions of unburned ammonia, NOx, etc. meet the regulatory restrictions.

[0071] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0072] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An adaptive control system for ammonia engine post-treatment, characterized in that: It includes a gas catalyst and a particulate capture device, the outlet end of the particulate capture device is connected to a denitration-ammonia removal treatment device, the gas catalyst, the particulate capture device and the denitration-ammonia removal treatment device are sequentially connected to the rear end of the exhaust port of the ammonia engine, and the gas catalyst, the particulate capture device and the denitration-ammonia removal treatment device are all arranged on the main pipe, and a bypass pipe is arranged in parallel on the main pipe.

2. The adaptive control system for ammonia engine post-treatment according to claim 1, characterized in that: The gas catalyst includes an oxidation catalyst, the particulate capture device includes a particulate trap, the inlet end of the oxidation catalyst is connected to the exhaust end of the ammonia engine, the outlet end of the oxidation catalyst is connected to the particulate trap, and the bypass line is arranged in parallel with the oxidation catalyst and the particulate trap.

3. The adaptive control system for ammonia engine post-treatment according to claim 1, characterized in that: The first end of the bypass line is connected to the inlet end of the gas catalyst, the second end of the bypass line is connected to the inlet end of the denitration-ammonia removal treatment device, and the inlet end of the bypass line is connected to the exhaust end of the ammonia engine.

4. The adaptive control system for ammonia engine post-treatment according to claim 3, characterized in that: The ammonia in the exhaust gas in the bypass pipeline serves as a reducing agent for the denitration-ammonia removal treatment device.

5. An adaptive control system for ammonia engine post-treatment according to any one of claims 1 to 4, characterized in that: The denitration-ammonia removal treatment device is arranged in series with the main pipeline and the bypass pipeline. The denitration-ammonia removal treatment device includes a selective catalytic reducer, and the selective catalytic reducer is connected to the outlet end of the particulate capture device.

6. The adaptive control system for ammonia engine post-treatment according to claim 5, characterized in that: The denitration-ammonia removal treatment device also includes an ammonia oxidation catalyst, which is connected to the selective catalytic reducer.

7. The adaptive control system for ammonia engine post-treatment according to claim 1, characterized in that: The main pipeline and the bypass pipeline are both provided with control valves, the outlet end of the main pipeline is connected to a post-processing controller, the ammonia engine is connected to an engine controller, and the engine controller is electrically connected to the post-processing controller.

8. The adaptive control system for ammonia engine post-treatment according to claim 7, characterized in that: The inlet ends of the main pipeline and the bypass pipeline are both provided with control valves, the control valves are electrically controlled opening valves, and the post-processing controller controls the action of the control valves.

9. The adaptive control system for ammonia engine post-treatment according to claim 7, characterized in that: A gas monitoring sensor is connected to the outlet end of the main pipeline, and the gas monitoring sensor is connected to the post-processing controller. The gas monitoring sensor is arranged at the outlet exhaust end of the denitrification-ammonia removal treatment device, and the gas monitoring sensor includes an ammonia concentration sensor and a NOx concentration sensor.

10. An adaptive control method for ammonia engine post-treatment, characterized in that: The following steps are involved: During the operation of the ammonia engine, the exhaust gas containing unburned ammonia is divided into two paths. The first path of unburned ammonia enters the oxidation catalyst through the first electronically controlled opening valve for oxidation treatment, and the second path of unburned ammonia is transported to the selective catalytic reduction device through the bypass pipeline as a reducing agent. The selective catalytic reduction device uses the second unburned ammonia to reduce NOx in the exhaust gas, and then transports the residual ammonia to the ammonia oxidation catalyst for oxidation elimination; The soot particles in the first exhaust gas are captured by a particulate collector; The engine controller obtains the working load information in real time and transmits it to the post-processing controller for feedforward control, and generates the initial opening instructions of the first electronically controlled opening valve and the second electronically controlled opening valve based on the table lookup method; The ammonia concentration sensor and the NOx concentration sensor are used to monitor the ammonia concentration and NOx concentration at the outlet of the ammonia oxidation catalyst in real time, and the feedback is fed back to the post-treatment controller and integrated with the adaptive algorithm to adjust the opening of the first electronically controlled opening valve and the second electronically controlled opening valve in real time to make the unburned ammonia and NOx emissions meet the preset thresholds.

Images