An ammonia-diesel fuel engine ammonia fuel liquefaction device and control method, apparatus, and medium

Abstract

The application discloses an ammonia-diesel fuel engine ammonia fuel liquefaction device and control method, equipment and medium, and relates to the field of ammonia engine design and control. The device comprises an ammonia backflow unit, a processing unit and a data acquisition unit. The ammonia backflow unit and the data acquisition unit are arranged on an ammonia injection supply line. The ammonia backflow unit and the data acquisition unit are connected with the processing unit. The data acquisition unit is used for detecting pressure data and temperature data on the ammonia injection supply line. The processing unit is used for generating a control instruction based on the pressure data and the temperature data. The ammonia backflow unit is used for performing ammonia backflow operation based on the control instruction. The application can ensure that there is no gaseous ammonia in the ammonia supply pipeline, increase the service life of the nozzle, and thus improve the reliability of the ammonia engine while reducing the use cost.

Description

Technical Field

[0001] This application relates to the field of ammonia engine design and control, and in particular to a device, control method, equipment and medium for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine. Background Technology

[0002] The development of new low-carbon and zero-carbon alternative fuels and their engine technologies is urgently needed. The development of ammonia engines has become a relatively ideal route. However, during the current development of ammonia engines, after the engine is shut down, ammonia gas is prone to liquefaction at a pressure higher than the saturated vapor pressure. The resulting liquid ammonia gas is highly corrosive and can easily damage the nozzles, leading to reduced reliability of the ammonia engine and increased operating costs. Summary of the Invention

[0003] The purpose of this application is to provide a device, control method, equipment and medium for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine, which can ensure that there is no gaseous ammonia in the ammonia supply pipeline, increase the service life of the nozzle, and thus improve the reliability of the ammonia engine while reducing the operating cost.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] In a first aspect, this application provides a device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine, comprising: an ammonia backflow unit, a processing unit, and a data acquisition unit;

[0006] Both the ammonia backflow unit and the data acquisition unit are installed on the ammonia injection supply line; both the ammonia backflow unit and the data acquisition unit are connected to the processing unit.

[0007] The data acquisition unit is used to detect pressure and temperature data on the ammonia injection supply line; the processing unit is used to generate control commands based on the pressure and temperature data; and the ammonia backflow unit is used to perform ammonia backflow operation based on the control commands.

[0008] Optionally, the ammonia injection supply line includes: an ammonia tank, a filter, a bypass valve, a first ammonia injection supply sub-line, a second ammonia injection supply sub-line, and an interface;

[0009] The ammonia tank and the filter are connected by pipelines; the bypass valve is located on the first branch pipeline connecting the filter and the interface; the ammonia backflow unit is located on the second branch pipeline connecting the filter and the interface; both the first ammonia injection supply sub-line and the second ammonia injection supply sub-line are connected to the interface pipeline.

[0010] Optionally, the first ammonia injection supply sub-line includes a first shut-off valve, a first pressure regulator, and a first ammonia nozzle;

[0011] The first ammonia nozzle is connected to the interface pipeline; the first shut-off valve and the first pressure regulator are sequentially arranged on the connection pipeline between the first ammonia nozzle and the interface along the direction of ammonia injection supply.

[0012] Optionally, the second ammonia injection supply sub-line includes a second shut-off valve, a second pressure regulator, and a second ammonia nozzle;

[0013] The second ammonia nozzle is connected to the interface pipeline; the second shut-off valve and the second pressure regulator are sequentially arranged on the connection pipeline between the second ammonia nozzle and the interface along the direction of ammonia injection supply.

[0014] Optionally, the ammonia backflow unit includes: a one-way valve, a third pressure regulator, and a vacuum pump;

[0015] The air pump, the third pressure regulator, and the one-way valve are sequentially arranged on the second branch pipeline connecting the filter and the interface along the direction of ammonia extraction.

[0016] Optionally, the data acquisition unit includes multiple temperature and pressure sensors;

[0017] Multiple temperature and pressure sensors are respectively installed in the ammonia backflow unit and the ammonia injection supply line.

[0018] Secondly, this application provides a control method for an ammonia-diesel fuel engine to prevent ammonia fuel liquefaction, comprising:

[0019] The operating status of the ammonia engine is obtained; the operating status of the ammonia engine includes the working state and the shutdown state.

[0020] When the ammonia engine is in a stopped state, the pressure, temperature and minimum threshold of ammonia pressure in the ammonia injection supply line are obtained.

[0021] Determine the pressure threshold for ammonia liquefaction at the stated temperature;

[0022] The operating state of the ammonia-diesel fuel engine's ammonia fuel liquefaction device is controlled based on the relationship between the pressure and the pressure threshold for ammonia liquefaction, and the relationship between the pressure and the minimum ammonia pressure threshold.

[0023] Optionally, controlling the operating state of the ammonia-diesel fuel engine's ammonia fuel liquefaction prevention device based on the relationship between the pressure and the pressure threshold for ammonia liquefaction, and the relationship between the pressure and the minimum ammonia pressure threshold, includes:

[0024] When the pressure is greater than or equal to the pressure threshold for ammonia liquefaction, a first control command is generated; the first control command is used to close the first shut-off valve or the second shut-off valve and to open the ammonia back-suction unit.

[0025] When the pressure is less than or equal to the minimum threshold of ammonia pressure, a second control command is generated; the second control command is used to open the first shut-off valve and the second shut-off valve, and to open the ammonia back-suction unit.

[0026] Thirdly, this application provides a computer device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the control method provided above.

[0027] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method provided above.

[0028] According to the specific embodiments provided in this application, this application has the following technical effects:

[0029] This application provides a device, control method, equipment, and medium for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine. By setting up an ammonia back-suction unit, a processing unit, and a data acquisition unit, the pressure threshold for ammonia liquefaction at the current temperature can be retrieved based on the temperature collected by the data acquisition unit. Then, based on the relationship between the current pressure and the ammonia liquefaction pressure threshold, and the relationship between the current pressure and the minimum ammonia pressure threshold, the ammonia back-suction unit is controlled to perform ammonia back-suction operation. This ensures that there is no gaseous ammonia in the ammonia supply pipeline, increases the service life of the nozzles, and thus improves the reliability of the ammonia engine while reducing operating costs. Furthermore, by setting up the ammonia back-suction unit to back-suction and recover ammonia in the ammonia injection supply line, the utilization rate of ammonia fuel can be improved. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine, provided in one embodiment of this application.

[0032] Figure 2A schematic flowchart of a control method for an ammonia-diesel fuel engine to prevent ammonia fuel liquefaction is provided in one embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 1-Ammonia tank, 2-Filter, 3-Ammonia backflow unit, 31-One-way valve, 32-Third pressure regulator, 33-Air pump, 4-Bypass valve, 5-First shut-off valve, 6-First pressure regulator, 7-First ammonia nozzle, 8-Second shut-off valve, 9-Second pressure regulator, 10-Second ammonia nozzle. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] In one exemplary embodiment, this application provides an ammonia-diesel fuel engine anti-ammonia fuel liquefaction device, including: an ammonia backflow unit 3, a processing unit, and a data acquisition unit.

[0039] Both the ammonia backflow unit 3 and the data acquisition unit are located on the ammonia injection supply line. Both the ammonia backflow unit 3 and the data acquisition unit are connected to the processing unit.

[0040] The data acquisition unit is used to detect pressure and temperature data on the ammonia injection supply line. The processing unit is used to generate control commands based on the pressure and temperature data. The ammonia backflow unit 3 is used to perform ammonia backflow operation based on the control commands.

[0041] In another exemplary embodiment of this application, such as Figure 1 As shown, the ammonia injection supply line includes: ammonia tank 1, filter 2, bypass valve 4, first ammonia injection supply sub-line, second ammonia injection supply sub-line, and interface.

[0042] Ammonia tank 1 and filter 2 are connected by pipeline. Bypass valve 4 is installed on the first branch pipeline connecting filter 2 and interface. Ammonia backflow unit 3 is installed on the second branch pipeline connecting filter 2 and interface. Both the first and second ammonia injection supply sub-lines are connected to the interface pipeline.

[0043] Among them, such as Figure 1 As shown, the first ammonia injection supply sub-line includes a first shut-off valve 5, a first pressure regulator 6, and a first ammonia nozzle 7. The first ammonia nozzle 7 is connected to the interface pipeline. The first shut-off valve 5 and the first pressure regulator 6 are sequentially arranged on the connection pipeline between the first ammonia nozzle 7 and the interface along the direction of ammonia injection supply.

[0044] The second ammonia injection supply sub-line includes a second shut-off valve 8, a second pressure regulator 9, and a second ammonia nozzle 10. The second ammonia nozzle 10 is connected to the interface pipeline. The second shut-off valve 8 and the second pressure regulator 9 are sequentially arranged on the connection pipeline between the second ammonia nozzle 10 and the interface along the direction of ammonia injection supply.

[0045] In another exemplary embodiment of this application, such as Figure 1 As shown, the ammonia backflow unit 3 includes: a one-way valve 31, a third pressure regulator 32, and a vacuum pump 33. The vacuum pump 33, the third pressure regulator 32, and the one-way valve 31 are sequentially arranged on the second branch pipeline connecting the filter 2 and the interface along the direction of ammonia extraction.

[0046] In another exemplary embodiment of this application, the data acquisition unit includes multiple temperature and pressure sensors. These sensors are respectively disposed in the ammonia backflow unit 3 and the ammonia injection supply line.

[0047] Among them, such as Figure 1 As shown, multiple temperature and pressure sensors are respectively installed on the first voltage regulator 6, the second voltage regulator 9, and the third voltage regulator 32.

[0048] In another exemplary embodiment of this application, an in-vehicle ECU monitoring system can be used as the processing unit.

[0049] Based on the specific structure of the ammonia-diesel fuel engine anti-ammonia liquefaction device given above in this application, after the engine starts, the bypass valve 4 opens, and the ammonia gas in the ammonia tank 1 is filtered by the filter 2 to remove impurities. After passing through the bypass valve 4, one path of gas passes through the first shut-off valve 5 and the first pressure regulator 6 to the first ammonia nozzle 7 (i.e., the ammonia nozzle of the engine gas injection device), where ammonia is injected based on the engine combustion mode determination and participates in in-cylinder combustion. The other path of ammonia gas passes through the second shut-off valve 8 and the second pressure regulator 9 to the second ammonia nozzle 10 (i.e., the ammonia nozzle of the aftertreatment injection device), where ammonia is injected based on sensor signals and logic judgment to convert nitrogen oxides (NOx) in the exhaust. After the engine stops, the residual ammonia in the ammonia injection supply line is recovered by the vacuum pump 33 according to the logic judgment, thereby ensuring that there is no gaseous ammonia in the ammonia injection supply line and thus preventing the formation of liquid ammonia that corrodes the nozzle. In addition, the ammonia back-suction unit 3 back-suctions and stores the residual gaseous ammonia in the ammonia injection supply line into the ammonia tank 1, which can also improve the ammonia fuel utilization rate.

[0050] Based on the same inventive concept, this application also provides a control method for an ammonia-diesel fuel engine to prevent ammonia fuel liquefaction, the control method comprising:

[0051] (1) Obtain the operating status of the ammonia engine. The operating status of the ammonia engine includes the working status and the shutdown status.

[0052] (2) When the ammonia engine is in a stopped state, obtain the pressure, temperature and minimum threshold of ammonia pressure in the ammonia injection supply line.

[0053] (3) Determine the pressure threshold for ammonia liquefaction at the specified temperature.

[0054] (4) The operating state of the ammonia-diesel fuel engine to prevent ammonia liquefaction is controlled based on the relationship between pressure and the pressure threshold for ammonia liquefaction, and the relationship between pressure and the minimum pressure threshold for ammonia.

[0055] When the pressure is greater than or equal to the pressure threshold for ammonia liquefaction, a first control command is generated. The first control command is used to close the first shut-off valve 5 or the second shut-off valve 8, and to open the ammonia backflow unit 3.

[0056] When the pressure is less than or equal to the minimum threshold pressure of ammonia, a second control command is generated. The second control command is used to open the first shut-off valve 5 and the second shut-off valve 8, and to open the ammonia backflow unit 3.

[0057] Based on the above description, the specific implementation process of the ammonia-diesel fuel engine anti-ammonia fuel liquefaction device and its control method provided in this application can be described as follows:

[0058] The engine stoppage is determined by the speed and throttle signals. If the engine has stopped, the bypass valve 4 is closed. The current pressure P1 and temperature are detected by the temperature and pressure sensors on the first pressure regulator 6, and the saturated vapor pressure corresponding to the current temperature is obtained to obtain the pressure threshold P for ammonia liquefaction at the current temperature. 阈值1 If P1≥P 阈值1 If the first ammonia injection supply line is at risk of ammonia liquefaction, the second shut-off valve 8 is closed, and the vacuum pump 33 starts working, drawing ammonia back from the first ammonia injection supply line. The drawn-back ammonia is pressurized and stabilized by the third pressure regulator 32, and then stored in the ammonia tank 1 through the one-way valve 31. Determine if P1 ≤ P min If P1≤P min This indicates that the ammonia in the first ammonia injection supply sub-line has been basically evacuated. Then, the first shut-off valve 5 and the second shut-off valve 8 are opened, and the vacuum pump 33 draws back the ammonia from both the first and second ammonia injection supply sub-lines. After being pressurized and stabilized by the third pressure regulator 32, the ammonia is stored in the ammonia tank 1 through the one-way valve 31. By simultaneously drawing back the ammonia from both ammonia injection supply sub-lines, the gaseous ammonia can be further completely removed. When P1≤P min And P2≤P min At this point, the ammonia backflow ends; otherwise, the logic returns to the previous level. min P1 indicates the pressure threshold at which ammonia has been completely evacuated, and P2 indicates the current pressure detected by the temperature and pressure sensor on the second regulator 9.

[0059] Similarly, if P2≥P 阈值2 The second ammonia injection supply sub-line is at risk of ammonia liquefaction, and should be adjusted accordingly based on the above P1≥P. 阈值1 The same logic control. The entire control process is as follows: Figure 2 As shown.

[0060] In summary, this application adds an ammonia backflow unit to the ammonia injection supply line to prevent liquid ammonia from damaging the nozzle, and recovers and stores residual ammonia in the ammonia tank, thereby improving the utilization rate of ammonia fuel.

[0061] This application, through relevant logic judgment and strategy control of ammonia backflow, can ensure that ammonia in the ammonia injection supply line is completely backflowed, preventing the formation of liquid ammonia in the engine fuel supply and after-treatment reducing agent supply pipelines, thereby improving the maturity of ammonia-diesel engine technology.

[0062] Furthermore, the ammonia-diesel fuel engine anti-ammonia fuel liquefaction device and control method provided in this application are not limited to ammonia-diesel dual-fuel engines, but can also be applied to engines in the form of ammonia-ether, ammonia-diesel, methanol-diesel, ammonia-hydrogen, etc.

[0063] In one exemplary embodiment, a computer device is provided, which may be a server or a terminal, and its internal structure diagram may be as follows. Figure 3 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores control data for the ammonia-diesel fuel engine's ammonia liquefaction prevention device. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When the computer program is executed by the processor, it implements the control methods described above.

[0064] Those skilled in the art will understand that Figure 3 The structures shown are merely block diagrams of some structures related to the present application and do not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than shown in the figures, or combine certain components, or have different component arrangements. In an exemplary embodiment, a computer device is provided, including a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above-described method embodiments.

[0065] In one exemplary embodiment, a computer-readable storage medium is provided storing a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0066] In one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in the above-described method embodiments.

[0067] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0068] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM).

[0069] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0070] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0071] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine, characterized in that, The ammonia-diesel fuel engine anti-ammonia fuel liquefaction device includes: an ammonia backflow unit, a processing unit, and a data acquisition unit; Both the ammonia backflow unit and the data acquisition unit are installed on the ammonia injection supply line; both the ammonia backflow unit and the data acquisition unit are connected to the processing unit. The data acquisition unit is used to detect pressure and temperature data on the ammonia injection supply line; the processing unit is used to generate control commands based on the pressure and temperature data; the ammonia back-suction unit is used to perform ammonia back-suction operation based on the control commands. The ammonia injection supply line includes: an ammonia tank, a filter, a bypass valve, a first ammonia injection supply sub-line, a second ammonia injection supply sub-line, and an interface; The ammonia tank and the filter are connected by pipelines; the bypass valve is located on the first branch pipeline connecting the filter and the interface; the ammonia backflow unit is located on the second branch pipeline connecting the filter and the interface; both the first ammonia injection supply sub-line and the second ammonia injection supply sub-line are connected to the interface pipeline. The ammonia backflow unit includes: a one-way valve, a third pressure regulator, and a vacuum pump; The air pump, the third pressure regulator, and the one-way valve are sequentially arranged on the second branch pipeline connecting the filter and the interface along the direction of ammonia extraction.

2. The device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine according to claim 1, characterized in that, The first ammonia injection supply sub-line includes a first shut-off valve, a first pressure regulator, and a first ammonia nozzle; The first ammonia nozzle is connected to the interface pipeline; the first shut-off valve and the first pressure regulator are sequentially arranged on the connection pipeline between the first ammonia nozzle and the interface along the direction of ammonia injection supply.

3. The device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine according to claim 1, characterized in that, The second ammonia injection supply sub-line includes a second shut-off valve, a second pressure regulator, and a second ammonia nozzle. The second ammonia nozzle is connected to the interface pipeline; the second shut-off valve and the second pressure regulator are sequentially arranged on the connection pipeline between the second ammonia nozzle and the interface along the direction of ammonia injection supply.

4. The device for preventing ammonia fuel liquefaction in an ammonia-diesel fuel engine according to claim 1, characterized in that, The data acquisition unit includes multiple temperature and pressure sensors; Multiple temperature and pressure sensors are respectively installed in the ammonia backflow unit and the ammonia injection supply line.

5. A control method for an ammonia-diesel fuel engine to prevent ammonia fuel liquefaction, characterized in that, The control method includes: The operating status of the ammonia engine is obtained; the operating status of the ammonia engine includes the working status and the shutdown status. When the ammonia engine is in a stopped state, the pressure, temperature and minimum threshold of ammonia pressure in the ammonia injection supply line are obtained. Determine the pressure threshold for ammonia liquefaction at the stated temperature; The operating state of the ammonia-diesel fuel engine anti-ammonia fuel liquefaction device as described in any one of claims 1-4 is controlled based on the relationship between the pressure and the pressure threshold for ammonia liquefaction, and the relationship between the pressure and the minimum ammonia pressure threshold.

6. The control method for the ammonia-diesel fuel engine anti-ammonia fuel liquefaction device according to claim 5, characterized in that, The operating state of the ammonia-diesel fuel engine's ammonia fuel liquefaction prevention device is controlled based on the relationship between the pressure and the ammonia liquefaction pressure threshold, and the relationship between the pressure and the minimum ammonia pressure threshold, including: When the pressure is greater than or equal to the pressure threshold for ammonia liquefaction, a first control command is generated; the first control command is used to close the first shut-off valve or the second shut-off valve and to open the ammonia back-suction unit. When the pressure is less than or equal to the minimum threshold of ammonia pressure, a second control command is generated; the second control command is used to open the first shut-off valve and the second shut-off valve, and to open the ammonia back-suction unit.

7. A computer device, comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the control method according to any one of claims 5-6.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the control method as described in any one of claims 5-6.

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