A system and control method for an ammonia-diesel dual-fuel engine

Abstract

This invention provides a system and control method for an ammonia-diesel dual-fuel engine. The system includes a valve assembly unit, an engine, an electronic controller, and a waste liquid collection tank. The electronic controller is electrically connected to the electronic control components in the valve assembly unit and the engine, controlling the operation of each component in the valve assembly unit and the engine. The valve assembly unit and the engine are connected to the waste liquid collection tank, and ammonia gas is discharged to the waste liquid collection tank under the control of the electronic controller. The control method includes: stopping the supply of ammonia gas to the engine cylinders when the engine switches from dual-fuel mode to diesel mode; simultaneously increasing the diesel injection volume into the cylinders to ensure smooth engine operation after the ammonia fuel supply stops; and collecting the ammonia gas discharged from the valve assembly unit and the engine into the waste liquid collection tank for unified treatment. This ensures that the engine can successfully switch to diesel mode in a short time, guarantees stable engine operation, and avoids the hazards caused by ammonia gas leakage.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and in particular to a system and control method for an ammonia-diesel dual-fuel engine. Background Technology

[0002] Controlling and reducing global greenhouse gas emissions from human activities has become an international consensus. Ammonia contains no carbon and can be synthesized from green hydrogen and nitrogen in the air, making it a very promising zero-carbon fuel. Using ammonia in engines can effectively reduce CO2 emissions.

[0003] Ammonia-diesel dual-fuel engines can operate in either full diesel mode or ammonia-diesel dual-fuel mode. However, when switching from ammonia-diesel dual-fuel mode to diesel mode, the ammonia supply to the engine is cut off, leaving residual ammonia in the ammonia supply lines. Since ammonia is toxic, it is crucial to ensure the safe removal of this residual ammonia without causing pollution or harming human health. Furthermore, it is essential to ensure the engine continues to operate stably during fuel switching. Summary of the Invention

[0004] In view of this, the present invention relates to a system and control method for an ammonia-diesel dual-fuel engine, which, when the engine switches from dual-fuel mode to diesel mode, stops the ammonia supply, discharges the ammonia in the ammonia supply pipeline, and collects it centrally.

[0005] Therefore, the present invention provides the following technical solution:

[0006] On one hand, the present invention provides a system for an ammonia-diesel dual-fuel engine, the system comprising: a valve assembly unit, an engine, an electronic controller, and a waste liquid collection tank;

[0007] The electronic controller is electrically connected to the electronic control components in the valve group unit and the engine, respectively, and controls the operation of each component in the valve group unit and the engine; the valve group unit and the engine are respectively connected to the waste liquid collection tank, and under the control of the electronic controller, ammonia gas is discharged to the waste liquid collection tank.

[0008] Furthermore, the valve assembly unit includes: a solenoid valve, a first shut-off valve, a second shut-off valve, a nitrogen solenoid valve, an ammonia inlet, a valve assembly unit vent outlet, and a nitrogen inlet;

[0009] The solenoid valve is a 2-position 3-way solenoid valve, including inlet A, outlet B and vent C;

[0010] The first shut-off valve is a three-way shut-off valve, including an inlet A, an outlet B, and a vent C;

[0011] The second shut-off valve is a two-way shut-off valve, including inlet A and outlet B;

[0012] The ammonia inlet is connected to the inlet A of the first shut-off valve, and the outlet B of the first shut-off valve is connected to the inlet A of the second shut-off valve; the outlet B of the second shut-off valve is connected to the engine.

[0013] The vent outlet of the valve group unit is connected to the vent C of the first shut-off valve; the vent outlet of the valve group unit is also connected to the vent C of two solenoid valves.

[0014] There are two solenoid valves, one connected to the first shut-off valve and the other connected to the second shut-off valve. The electronic controller is electrically connected to the two solenoid valves respectively.

[0015] The nitrogen inlet is connected to the nitrogen solenoid valve, and the electronic controller is electrically connected to the nitrogen solenoid valve; the other end of the nitrogen solenoid valve is connected after the outlet B of the second shut-off valve.

[0016] The valve unit's vent outlet is connected to the waste liquid collection tank via a pipeline.

[0017] Furthermore, the engine includes: an ammonia injection valve, a cylinder, an electronically controlled diesel injection pump, a vent solenoid valve, and a vent.

[0018] The ammonia jet valve and the electronically controlled diesel injection pump are respectively connected to the cylinder;

[0019] The electronic controller is electrically connected to the ammonia jet valve and the electronically controlled diesel injection pump, respectively.

[0020] The venting solenoid valve is located at the end of the ammonia supply line of the engine, and the electronic controller is electrically connected to the venting solenoid valve.

[0021] The vent is connected to the outlet of the vent solenoid valve and is connected to the waste liquid collection tank through a pipeline.

[0022] Furthermore, the two pipelines that discharge through the valve unit's outlet and discharge into the waste liquid collection tank through the vent are independent pipelines.

[0023] Furthermore, there are multiple sets of ammonia injection valves, cylinders, and electronically controlled diesel injection pumps. Within each set, the ammonia injection valves and electronically controlled diesel injection pumps are connected to the cylinders. The electronic controller is electrically connected to the ammonia injection valves and electronically controlled diesel injection pumps in each set.

[0024] Furthermore, the ammonia gas discharged into the waste liquid collection tank mixes with the water therein to form waste liquid, which is then uniformly treated after a predetermined time.

[0025] Furthermore, the nitrogen pressure at the nitrogen inlet is 1-2 bar higher than the maximum ammonia injection pressure of the ammonia injection valve.

[0026] Furthermore, the present invention also provides a control method for an ammonia-diesel dual-fuel engine, applied to the aforementioned ammonia-diesel dual-fuel engine system. When the electronic controller receives a signal to switch from ammonia-diesel dual-fuel mode to diesel mode, it operates according to the following control method:

[0027] The electronic controller de-energizes the ammonia injection valve, stopping the delivery of ammonia to the engine cylinders; at the same time, the controller controls the electronic diesel injection pump to increase the amount of diesel fuel injected into the cylinders, ensuring that the engine runs smoothly after the ammonia fuel supply stops.

[0028] The electronic controller de-energizes the two solenoid valves, disconnecting the AB passage within the solenoid valves and connecting the BC passage. The ammonia gas in the upper chambers of the first and second shut-off valves is discharged into the waste liquid collection tank through the BC passage within the solenoid valves and the valve group unit vent outlet. At the same time, the first and second shut-off valves lose pressure in their upper chambers, causing the A and B passages to disconnect.

[0029] The electronic controller de-energizes the venting solenoid valve, allowing the ammonia gas remaining in the pipeline between the outlet B of the second shut-off valve and the venting solenoid valve to be discharged into the waste liquid collection tank through the vent.

[0030] Furthermore, after the AB passage of the first and second shut-off valves is disconnected, the BC passage of the first shut-off valve is connected, and the ammonia gas remaining between the outlet B of the first shut-off valve and the inlet A of the second shut-off valve is discharged into the waste liquid collection tank through the vent outlet of the valve group unit.

[0031] Furthermore, 1 second after the venting solenoid valve is de-energized, the electronic controller de-energizes and opens the nitrogen solenoid valve, and the nitrogen enters the ammonia pipeline after the second shut-off valve through the nitrogen inlet, and the residual ammonia in it is discharged into the waste liquid collection tank through the venting solenoid valve and the vent.

[0032] Advantages and positive effects of the present invention: The present invention provides a system and control method for an ammonia-diesel dual-fuel engine. When the engine switches from dual-fuel mode to diesel mode, it stops the supply of ammonia, discharges and collects the ammonia in the ammonia supply pipeline, and ensures that the engine can successfully switch to diesel mode in a short time, ensuring the stable operation of the engine and avoiding the hazards caused by ammonia leakage. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of an ammonia-diesel dual-fuel engine system according to an embodiment of the present invention, wherein... Figure 1 The dashed lines in the diagram represent electrical control circuit connections;

[0035] In the diagram, 1-valve assembly unit, 1.1-solenoid valve, 1.2-first shut-off valve, 1.3-second shut-off valve, 1.4-nitrogen solenoid valve, 1.5-ammonia inlet, 1.6-valve assembly unit vent outlet, 1.7-nitrogen inlet, 2-engine, 2.1-ammonia injection valve, 2.2-cylinder, 2.3-electronic diesel injection pump, 2.4-vent solenoid valve, 2.5-vent, 3-electronic controller, 4-waste liquid collection tank. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] like Figure 1 As shown, the ammonia-diesel dual-fuel engine system in this embodiment of the invention includes: a valve assembly unit 1, an engine 2, an electronic controller 3, and a waste liquid collection tank 4. The valve assembly unit 1 and the engine 2 are respectively connected to the waste liquid collection tank 4, discharging waste liquid into the waste liquid collection tank 4; the electronic controller 3 is electrically connected to the electronic control components in the valve assembly unit 1 and the engine 2, controlling the operation of each component in the valve assembly unit 1 and the engine 2. Wherein:

[0039] Valve assembly unit 1 includes: a solenoid valve 1.1, a first shut-off valve 1.2, a second shut-off valve 1.3, a nitrogen solenoid valve 1.4, an ammonia inlet 1.5, a valve assembly unit vent outlet 1.6, and a nitrogen inlet 1.7.

[0040] The first shut-off valve 1.2 is a three-way shut-off valve, including inlet A, outlet B, and vent C. The second shut-off valve 1.3 is a two-way shut-off valve, including inlet A and outlet B. Ammonia inlet 1.5 is connected to inlet A of the first shut-off valve 1.2, and outlet B of the first shut-off valve 1.2 is connected to inlet A of the second shut-off valve 1.3. Ammonia can enter from ammonia inlet 1.5, pass through inlet A and outlet B of the first shut-off valve 1.2, and inlet A and outlet B of the second shut-off valve 1.3, and then enter engine 2.

[0041] The valve assembly unit's vent outlet 1.6 is connected to the vent port C of the first shut-off valve 1.2. The vent outlet 1.6 is also connected to the vent ports C of two solenoid valves 1.1. Under the control of the solenoid valves, the ammonia gas inside the valve assembly unit is discharged through the vent port C of the first shut-off valve 1.2 from the vent outlet 1.6. The other end of the vent outlet 1.6 is connected to the waste liquid collection tank 4 via a pipeline, allowing the ammonia gas discharged from the valve assembly unit 1 to be collected in the waste liquid collection tank 4.

[0042] Solenoid valve 1.1 is a 2-position 3-way solenoid valve, including inlet A, outlet B, and vent C. There are two solenoid valves 1.1, one connected to the first shut-off valve 1.2 and the other connected to the second shut-off valve 1.3. The electronic controller 3 is electrically connected to both solenoid valves 1.1, and can control the opening and closing of the first shut-off valve 1.2 and the second shut-off valve 1.3 through these two solenoid valves 1.1.

[0043] The nitrogen inlet 1.7 is connected to a nitrogen solenoid valve 1.4. The electronic controller 3 is electrically connected to the nitrogen solenoid valve 1.4. The other end of the nitrogen solenoid valve 1.4 is connected after the outlet B of the second shut-off valve 1.3. The nitrogen purging time can be controlled by the nitrogen solenoid valve 1.4.

[0044] Engine 2 includes: an ammonia injection valve 2.1, a cylinder 2.2, an electronically controlled diesel injection pump 2.3, a vent solenoid valve 2.4, and a vent port 2.5. There are multiple sets of the ammonia injection valve 2.1, cylinder 2.2, and electronically controlled diesel injection pump 2.3, with each set of ammonia injection valve 2.1 and electronically controlled diesel injection pump 2.3 connected to cylinder 2.2.

[0045] The electronic controller 3 is electrically connected to the ammonia injection valve 2.1 and the electronically controlled diesel injection pump 2.3 in each group, respectively, and is used to control the amount of ammonia and diesel injected into the cylinder.

[0046] The vent solenoid valve 2.4 is located at the end of the ammonia supply line of the engine 2; the electronic controller 3 is electrically connected to the vent solenoid valve 2.4 and is used to control the amount of ammonia discharged from the engine; the vent 2.5 is connected to the outlet of the vent solenoid valve 2.4 and is connected to the waste liquid collection tank 4 through a pipeline, so that the ammonia discharged from the engine 2 can be collected into the waste liquid collection tank 4.

[0047] Vent 2.5 is connected to waste liquid collection tank 4 via a pipeline. The two pipelines that discharge into waste liquid collection tank 4 via valve unit vent outlet 1.6 and vent 2.5 are independent pipelines; the ammonia gas discharged into waste liquid collection tank 4 mixes with the water inside to form waste liquid (ammonia gas is toxic and cannot be directly discharged into the atmosphere), and the waste liquid is treated uniformly after a certain period of time.

[0048] The aforementioned engine 2 is an ammonia-diesel dual-fuel engine, which can operate in full diesel mode or in ammonia-diesel dual-fuel mode.

[0049] The aforementioned ammonia-diesel dual-fuel engine system, under the control of the electronic controller 3, can stop the ammonia supply, discharge the ammonia in the ammonia supply pipeline, and collect it centrally when the engine switches from dual-fuel mode to diesel mode.

[0050] When the electronic controller 3 of the ammonia-diesel dual-fuel engine receives a signal to switch from dual-fuel mode to diesel mode, it operates according to the following control method:

[0051] The electronic controller 3 de-energizes the ammonia injection valve 2.1, stopping the supply of ammonia to the cylinder 2.2 in the engine 2; at the same time, the controller controls the electronic diesel injection pump 2.3 to increase the amount of diesel fuel injected into the cylinder 2.2, ensuring that the engine runs smoothly after the ammonia fuel supply stops.

[0052] The electronic controller 3 de-energizes the two solenoid valves 1.1, disconnecting the AB passage within solenoid valve 1.1 and connecting the BC passage. The ammonia gas in the upper chambers of the first shut-off valve 1.2 and the second shut-off valve 1.3 is discharged into the waste liquid collection tank 4 through the BC passage within the solenoid valve 1.1 and the valve group unit vent outlet 1.6. At the same time, the first shut-off valve 1.2 and the second shut-off valve 1.3 lose pressure in their upper chambers, causing the A and B passages to disconnect.

[0053] Furthermore, since the ammonia gas in the upper chambers of the first shut-off valve 1.2 and the second shut-off valve 1.3 has been discharged, after the AB passage of the first shut-off valve 1.2 and the second shut-off valve 1.3 is disconnected, the BC passage of the first shut-off valve 1.2 is connected, and the ammonia gas remaining between the B port of the first shut-off valve 1.2 and the A port of the second shut-off valve 1.3 is discharged into the waste liquid collection tank 4 through the valve group unit vent outlet 1.6.

[0054] At the same time, the electronic controller 3 de-energizes the venting solenoid valve 2.4, and discharges the ammonia gas remaining in the pipeline between the B port of the second shut-off valve 1.3 and the venting solenoid valve 2.4 into the waste liquid collection tank 4 through the vent 2.5.

[0055] One second after the venting solenoid valve 2.4 is de-energized, the electronic controller 3 de-energizes and opens the nitrogen solenoid valve 1.4. Nitrogen enters the ammonia pipeline after the second shut-off valve 1.3 through the nitrogen inlet 1.7. The residual ammonia in the pipeline is discharged into the waste liquid collection tank 4 through the venting solenoid valve 2.4 and the vent 2.5.

[0056] After 10 seconds, the electronic controller 3 will power on and close the nitrogen solenoid valve 1.4 and the vent solenoid valve 2.4.

[0057] The nitrogen pressure at nitrogen inlet 1.7 is 1-2 bar higher than the maximum ammonia injection pressure at ammonia injection valve 2.1.

[0058] In the above embodiments, the switching of the ammonia-diesel dual-fuel engine from dual-fuel mode to diesel mode was realized, ensuring the safe and stable operation of the engine.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for an ammonia-diesel dual fuel engine, characterized by, The system comprises a valve group unit (1), an engine (2), an electronic controller (3) and a waste liquid collection tank (4); The electronic controller (3) is electrically connected with the electric control components in the valve group unit (1) and the engine (2) respectively, and controls the actions of the components in the valve group unit (1) and the engine (2); the valve group unit (1) and the engine (2) are respectively communicated with the waste liquid collection tank (4), and ammonia gas is discharged to the waste liquid collection tank (4) under the control of the electronic controller (3); The valve group unit (1) comprises an electromagnetic valve (1.1), a first stop valve (1.2), a second stop valve (1.3), a nitrogen electromagnetic valve (1.4), an ammonia gas inlet (1.5), a valve group unit emptying outlet (1.6) and a nitrogen inlet (1.7); The electromagnetic valve (1.1) is a 2-position 3-way electromagnetic valve, comprising an inlet A, an outlet B and a discharge port C; The first stop valve (1.2) is a three-way stop valve, comprising an inlet A, an outlet B and a discharge port C; The second stop valve (1.3) is a two-way stop valve, comprising an inlet A and an outlet B; the ammonia gas inlet (1.5) is connected with the inlet A of the first stop valve (1.2), the outlet B of the first stop valve (1.2) is connected with the inlet A of the second stop valve (1.3), and the outlet B of the second stop valve (1.3) is connected with the engine (2); The valve group unit emptying outlet (1.6) is connected with the discharge port C of the first stop valve (1.2); the valve group unit emptying outlet (1.6) is also connected with the discharge ports C of two electromagnetic valves (1.1); The electromagnetic valve (1.1) has two, one of which is connected with the first stop valve (1.2), and the other of which is connected with the second stop valve (1.3); the electronic controller (3) is electrically connected with the two electromagnetic valves (1.1) respectively; The nitrogen inlet (1.7) is connected with the nitrogen electromagnetic valve (1.4), the electronic controller (3) is electrically connected with the nitrogen electromagnetic valve (1.4), and the other end of the nitrogen electromagnetic valve (1.4) is connected after the outlet B of the second stop valve (1.3); The valve group unit emptying outlet (1.6) is communicated with the waste liquid collection tank (4) through a pipeline.

2. A system for an ammonia-diesel dual fuel engine according to claim 1, characterized in that, The engine (2) comprises an ammonia gas injection valve (2.1), a cylinder (2.2), an electronic control diesel oil injection pump (2.3), a gas permeation electromagnetic valve (2.4) and a gas permeation port (2.5); The ammonia gas injection valve (2.1) and the electronic control diesel oil injection pump (2.3) are connected with the cylinder (2.2) respectively; The electronic controller (3) is electrically connected with the ammonia gas injection valve (2.1) and the electronic control diesel oil injection pump (2.3) respectively; The gas permeation electromagnetic valve (2.4) is arranged at the end of an ammonia gas supply pipeline of the engine (2), and the electronic controller (3) is electrically connected with the gas permeation electromagnetic valve (2.4); The gas permeation port (2.5) is connected with the outlet of the gas permeation electromagnetic valve (2.4), and is communicated with the waste liquid collection tank (4) through a pipeline.

3. A system for an ammonia-diesel dual fuel engine according to claim 2, characterized in that, The two pipes for exhausting the ammonia gas through the valve group unit outlet (1.6) and into the waste liquid collection tank (4) through the air vent (2.5) are independent pipes.

4. The system of an ammonia-diesel dual fuel engine according to claim 1, characterized in that, The ammonia injection valve (2.1), the cylinder (2.2) and the electronic control diesel injection pump (2.3) have multiple groups, and the ammonia injection valve (2.1) and the electronic control diesel injection pump (2.3) in each group are connected to the cylinder (2.2) respectively; the electronic controller (3) is electrically connected to the ammonia injection valve (2.1), the electronic control diesel injection pump (2.3) in each group respectively.

5. The system of an ammonia-diesel dual fuel engine according to claim 1, characterized in that, The ammonia gas exhausted into the waste liquid collection tank (4) is mixed with water to form waste liquid, which is uniformly treated after a predetermined time.

6. The system of an ammonia-diesel dual fuel engine according to claim 2, wherein, The nitrogen gas pressure at the nitrogen gas inlet (1.7) is 1-2 bar higher than the maximum ammonia gas injection pressure of the ammonia injection valve (2.1).

7. A control method of an ammonia-diesel dual fuel engine, characterized by, The system applied to the ammonia-diesel dual-fuel engine of any one of claims 1-6 operates according to the following control method when the electronic controller (3) receives a signal switching from the ammonia-diesel dual-fuel mode to the diesel mode: The electronic controller (3) de-energizes the ammonia injection valve (2.1) to stop delivering ammonia gas into the cylinder (2.2) in the engine (2); at the same time, the controller controls the electronic control diesel injection pump (2.3) to increase the diesel injection amount into the cylinder (2.2) to ensure smooth engine operation after the ammonia fuel supply is stopped; The electronic controller (3) de-energizes the two electromagnetic valves (1.1) to disconnect the AB passage in the electromagnetic valve (1.1) and connect the BC passage, so that the ammonia gas in the upper chamber of the first stop valve (1.2) and the second stop valve (1.3) is exhausted into the waste liquid collection tank (4) through the BC passage in the electromagnetic valve (1.1) and the valve group unit exhaust outlet (1.6), and at the same time, the first stop valve (1.2) and the second stop valve (1.3) are disconnected due to the loss of pressure in the upper chamber, resulting in the disconnection of the AB passage; The electronic controller (3) de-energizes the air vent electromagnetic valve (2.4) to exhaust the ammonia gas remaining in the pipe between the outlet B of the second stop valve (1.3) and the air vent electromagnetic valve (2.4) into the waste liquid collection tank (4) through the air vent (2.5).

8. A control method of an ammonia-diesel dual fuel engine according to claim 7, characterized in that, After the AB passage of the first stop valve (1.2) and the second stop valve (1.3) is disconnected, the BC passage of the first stop valve (1.2) is connected to exhaust the ammonia gas remaining between the outlet B of the first stop valve (1.2) and the inlet A of the second stop valve (1.3) into the waste liquid collection tank (4) through the valve group unit exhaust outlet (1.6).

9. The control method of an ammonia-diesel dual fuel engine according to claim 7, characterized by, After the air vent electromagnetic valve (2.4) is de-energized for 1s, the electronic controller (3) de-energizes the nitrogen gas electromagnetic valve (1.4) to open, and the nitrogen gas enters the ammonia gas pipe after the second stop valve (1.3) through the nitrogen gas inlet (1.7), exhausts the ammonia gas remaining in the pipe into the waste liquid collection tank (4) through the air vent electromagnetic valve (2.4) and the air vent (2.5).

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