Marine ammonia catalysis hydrogen production system and control method

Abstract

The invention belongs to the field of novel internal combustion engines, and relates to a marine ammonia catalytic hydrogen production system and a control method, the marine ammonia catalytic hydrogen production system comprises an ammonia catalytic hydrogen production reaction system and an ammonia-hydrogen mixing ratio control system, and the marine ammonia catalytic hydrogen production system comprises an ammonia fuel tank, a gasifier, a flue gas waste heat heater, an ammonia catalytic reactor, a cooler and an ammonia-hydrogen buffer tank, the system comprises a temperature sensor, a pressure sensor, a flow sensor, a knock sensor, a rotating speed sensor, a crankshaft position sensor, an ammonia nitrogen hydrogen ratio ultrasonic online tester, a digital signal processor, a flow and pressure regulating valve actuator, a power supply circuit and a PC (Personal Computer). An ammonia fuel direct channel at an inlet of the internal combustion engine is added; a flow valve actuator at an inlet of a flue gas waste heat heater, an ammonia fuel direct channel flow valve actuator and a pressure valve actuator at an inlet of an engine are controlled in real time through a digital signal processor according to a detection result of a flow and ammonia nitrogen hydrogen ratio ultrasonic online tester so as to meet the working condition requirements of an internal combustion engine; the preset ammonia-hydrogen mixing ratio of the internal combustion engine is achieved by adjusting the reactor temperature and supplying ammonia fuel.

Description

Technical Field

[0001] The present application relates to the technical field of internal combustion engines, and in particular to a marine ammonia catalytic hydrogen production system and a control method. Background Art

[0002] At present, the environmental pollution caused by the consumption of fossil fuels is becoming increasingly prominent. At the same time, the shipping industry has developed rapidly in recent years. More than 80% of international trade comes from shipping; each year, the nitrogen oxides emitted by ocean-going ships worldwide account for about 15.2% of the total emissions.

[0003] Although ammonia and hydrogen are good alternative fuels for ships, there are inevitable technical difficulties when using them alone. The storage and transportation of hydrogen and its safety restrict its development, and the poor combustion performance of ammonia restricts its development. At the same time, the waste heat of the engine exhaust will take away some heat, reducing the efficiency of the internal combustion engine. Ammonia-hydrogen mixed combustion is expected to solve these technical bottlenecks.

[0004] The present invention designs a marine ammonia catalytic hydrogen production system and a control method, adds an ammonia fuel direct channel at the inlet of the internal combustion engine, and controls the flow valve actuator at the inlet of the flue gas waste heat heater, the ammonia fuel direct channel flow valve actuator and the pressure valve actuator at the engine inlet in real time through the detection results of the flow rate and ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument to match the working condition requirements of the internal combustion engine, and realizes the preset ammonia hydrogen mixing ratio of the internal combustion engine by adjusting the reactor temperature and the direct supply of ammonia fuel. Summary of the invention

[0005] To achieve the above objectives, this application provides the following technical solutions:

[0006] According to a first aspect of the present invention, the present invention claims protection for a marine ammonia catalytic hydrogen production system, comprising: an ammonia catalytic hydrogen production reaction system and an ammonia-hydrogen mixing ratio control system;

[0007] The ammonia catalytic hydrogen production reaction system comprises an ammonia fuel tank, a gasifier, a flue gas waste heat heater, an ammonia catalytic reactor, a cooler and an ammonia hydrogen buffer tank;

[0008] The ammonia-hydrogen mixture ratio control system also includes a temperature sensor, a pressure sensor, a flow sensor, a knock sensor, a speed sensor, a crankshaft position sensor, an ammonia-nitrogen-hydrogen ratio ultrasonic online measuring instrument, a digital signal processor and a flow and pressure regulating valve actuator.

[0009] Furthermore, it also includes:

[0010] There is a direct ammonia fuel channel at the inlet of the internal combustion engine. Liquid ammonia flows out of the ammonia fuel tank and passes through the gasifier into two paths. One path enters the flue gas waste heat heater for heating, enters the ammonia catalytic reactor for cracking reaction, and the mixed gas enters the cooler and finally flows into the ammonia-hydrogen buffer tank. The other path does not undergo catalytic cracking reaction and is used to add into the mixed gas to complete the balancing of the preset ammonia-hydrogen mixing ratio for use in the internal combustion engine.

[0011] Furthermore, an ammonia flow sensor and a first ammonia flow regulating valve are installed in the ammonia fuel direct channel;

[0012] The ammonia fuel reaction passage is installed on the second ammonia flow regulating valve. Temperature sensors and flow sensors are installed after the flue gas waste heat heater, ammonia catalytic reactor and cooler respectively. The outlet pipeline of the ammonia hydrogen buffer tank is installed with pressure and flow sensors, an ultrasonic online ammonia nitrogen hydrogen ratio measuring instrument and a flow regulating valve.

[0013] Furthermore, the digital signal processor input signals come from the temperature, pressure, flow sensors, knock sensors, speed sensors, crankshaft position sensors, and ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument, and the output signals control the flow, pressure regulating valve actuator, reactor heating temperature, and cooler heat exchange medium flow.

[0014] Further, the heat exchange medium used in the gasifier is a 50% water-ethylene glycol solution;

[0015] The heat exchange medium used in the cooler is 50% water-ethylene glycol solution.

[0016] According to a second aspect of the present invention, the present invention claims protection for a method for controlling a marine ammonia catalytic hydrogen production system, which controls the marine ammonia catalytic hydrogen production system, comprising:

[0017] The digital signal processor controls the first ammonia flow regulating valve of the ammonia flow direct channel, the second ammonia flow regulating valve of the ammonia reaction channel and the pressure regulating valve in real time according to the internal combustion engine operating conditions, the fuel state at the inlet and the gas state of the ammonia hydrogen buffer tank outlet pipeline, and realizes the preset ammonia hydrogen mixing ratio of the engine by adjusting the direct supply of ammonia fuel;

[0018] The software algorithm adopts PID control, and its transfer function is as follows:

[0019] G C (s) = [(1 + T d s) / (1+εT d s)][K p +(K p / T i s)]

[0020] Among them, T d is the differential time constant, ε is the differential gain, K pis the magnification factor, T i is the integration time constant.

[0021] Furthermore, the digital signal processor obtains the operating condition of the internal combustion engine through the speed sensor and the crankshaft position sensor, obtains the fuel status at the inlet of the internal combustion engine through the temperature, flow and pressure sensors, and obtains the gas status of the outlet pipeline of the ammonia hydrogen buffer tank through the pressure and flow sensors and the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument.

[0022] Furthermore, the digital signal processor obtains real-time data through the temperature sensor to control the flow rate of the heat transfer medium of the cooler;

[0023] The digital signal processor obtains real-time data through the temperature sensor to control the heating temperature of the ammonia catalytic reactor;

[0024] The digital signal processor obtains real-time data through the flow sensor to control the first ammonia flow regulating valve;

[0025] The digital signal processor uses the knock sensor to determine whether abnormal combustion such as knocking occurs in the cylinder of the internal combustion engine.

[0026] Further, the digital signal processor is composed of four-channel A / D and four-channel D / A converters and ATD-C25-F development board;

[0027] The CPU in the ATD-C25-F development board is a 32-bit digital signal processor TMS320C25, with a clock frequency of 40MHz;

[0028] With the support of system software, the development board can realize hardware debugging and software development of the target system. Its command format is compatible with the PCDEBUG command format, which can conveniently and reliably develop and debug the hardware and software of the user system.

[0029] The A / D converter uses the 12-bit high-speed device AD678KD with a conversion frequency of 200kHz. The AD678KD is designed to work in bipolar synchronous mode, and the data is input from the lower 12 bits.

[0030] The D / A conversion chip uses a 12-bit D / A conversion chip DAC1210 with a current settling time of 1μs. It is designed to work in bipolar mode and data is output from the upper 12 bits.

[0031] Furthermore, G. C (s) Implemented with a digital signal processor and transformed into a discrete control algorithm;

[0032] Using the differential-first process, the sampling period T is obtained by the differential-difference mapping design method. The output quantities at the nth sampling moment are:

[0033] u0(n)=k1u0(n-1)+k2u e -k3u e (n-1)

[0034] u1(n)=K p u0(n)

[0035] u2(n)=u2(n-1)+k4u0(n)

[0036] u c (n)=u1(n)+u2(n)

[0037] k1=εT d / (T+εT d )

[0038] k2=(T+T d ) / (T+εT d )

[0039] k3=T d / (T+εT d )

[0040] k4=K p T / T i

[0041] Among them, u e is the system input, u0, u1, u2, u c are the differential link, proportional link, integral link and the final output value of the system respectively. k1, k2, k3 and k4 are the gains of the system at the previous moment, differential link, proportional link and integral link respectively. K p is the amplification factor, ε is the differential gain, T d is the differential time constant, T i is the integration time constant.

[0042] Beneficial Effects

[0043] The present invention increases an ammonia fuel direct channel at the inlet of the internal combustion engine, and controls the flow valve actuator at the inlet of the flue gas waste heat heater, the ammonia fuel direct channel flow valve actuator and the pressure valve actuator at the inlet of the engine in real time through a digital signal processor based on the detection results of the flow rate and the ammonia-nitrogen-hydrogen ratio ultrasonic online measuring instrument to match the working conditions of the internal combustion engine, adjust the reactor temperature and the supply of ammonia fuel to achieve a preset ammonia-hydrogen mixing ratio of the internal combustion engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A structural diagram of a marine ammonia catalytic hydrogen production system claimed in an embodiment of the present application;

[0045] Figure 2A closed-loop block diagram of an ammonia-hydrogen mixing ratio control system of a marine ammonia catalytic hydrogen production system control method claimed in an embodiment of the present application;

[0046] Figure 3 This is a structural block diagram of a PID control algorithm transfer function of a marine ammonia catalytic hydrogen production system control method claimed in an embodiment of the present application.

[0047] 1. Gasifier; 2. Heater; 3. Ammonia catalytic reactor; 4. Cooler; 5. Internal combustion engine; 6.; 7. Second ammonia flow regulating valve; 8. First ammonia flow regulating valve; 9. Third ammonia flow regulating valve; 10. Pressure regulating valve; 11. First temperature sensor; 12. Second temperature sensor; 13. Third temperature sensor; 14. First flow sensor; 15. Second flow sensor; 16. Third flow sensor; 17. Ultrasonic online determination of ammonia nitrogen hydrogen ratio; 18. First pressure sensor; 19. Second pressure sensor; 20. Third pressure sensor; 21. Knock sensor; 22. Speed ​​sensor; 23. Crankshaft position sensor; 24. Ammonia flow sensor; 25. Digital signal processor. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] The terms "first", "second" and "third" in this application are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first", "second" and "third" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In the embodiments of this application, all directional indications such as up, down, left, right, front, back... are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0050] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] According to the first embodiment of the present invention, referring to Figure 1 , the present invention claims protection for a marine ammonia catalytic hydrogen production system, comprising: an ammonia catalytic hydrogen production reaction system and an ammonia-hydrogen mixing ratio control system;

[0052] The ammonia catalytic hydrogen production reaction system includes an ammonia fuel tank, a gasifier 1, a flue gas waste heat heater 2, an ammonia catalytic reactor 3, a cooler 4 and an ammonia hydrogen buffer tank;

[0053] The ammonia-hydrogen mixing ratio control system also includes a first temperature sensor 11, a second temperature sensor 12 and a third temperature sensor 13, a first pressure sensor 18, a second pressure sensor 19 and a third pressure sensor 20, a first flow sensor 14, a second flow sensor 15 and a third flow sensor 16, a knock sensor 21, a speed sensor 22, a crankshaft position sensor 23, an ammonia-nitrogen-hydrogen ratio ultrasonic online measuring instrument 17, a digital signal processor 25, a fourth ammonia flow regulating valve 6, a third ammonia flow regulating valve 9, a second ammonia flow regulating valve 7, a first ammonia flow regulating valve 8, and a pressure regulating valve 10.

[0054] Furthermore, it also includes:

[0055] The ammonia fuel direct channel at the inlet of the internal combustion engine, liquid ammonia flows out from the ammonia fuel tank, firstly adjusts the flow rate and pressure value through the fourth ammonia flow regulating valve 6, and then passes through the gasifier 1 to be divided into two paths, one of which enters the flue gas waste heat heater 2 for heating, enters the ammonia catalytic reactor 3 for cracking reaction, and the mixed gas enters the cooler 4, and finally flows into the ammonia hydrogen buffer tank; the other path does not undergo catalytic cracking reaction, and is used to add into the mixed gas to complete the balancing of the preset ammonia hydrogen mixing ratio for use by the internal combustion engine 5.

[0056] Furthermore, an ammonia flow sensor 24 and a first ammonia flow regulating valve 8 are installed in the ammonia fuel direct channel;

[0057] The ammonia fuel reaction passage is installed on the second ammonia flow regulating valve 7. The third temperature sensor 13 and the first flow sensor 14 are respectively installed behind the flue gas waste heat heater 2, the ammonia catalytic reactor 3, and the cooler 4. The outlet pipeline of the ammonia hydrogen buffer tank is installed with the first pressure sensor 18, the second flow sensor 15, the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument 17 and the third ammonia flow regulating valve 9.

[0058] Furthermore, the digital signal processor 25 inputs signals from the second temperature sensor 12, the third pressure sensor 20, the third flow sensor 16, the knock sensor 21, the speed sensor 22, the crankshaft position sensor 23, and the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument 17, and the output signals control the flow, the pressure regulating valve actuator, the heating temperature of the ammonia catalytic reactor, and the heat exchange medium flow of the cooler 4.

[0059] Further, the heat exchange medium used in the gasifier 1 is a 50% water-ethylene glycol solution;

[0060] The heat exchange medium used in cooler 4 is 50% water-ethylene glycol solution.

[0061] According to a second embodiment of the present invention, the present invention claims protection for a control method of a marine ammonia catalytic hydrogen production system, which controls a marine ammonia catalytic hydrogen production system, comprising:

[0062] Reference Figure 2 , is a closed-loop block diagram of the ammonia-hydrogen mixing ratio control system of the present invention;

[0063] The digital signal processor 25 controls the first ammonia flow regulating valve 8 of the ammonia flow direct channel, the second ammonia flow regulating valve 7 of the ammonia reaction channel and the pressure regulating valve 10 in real time according to the internal combustion engine operating conditions, the fuel state at the inlet and the gas state of the ammonia hydrogen buffer tank outlet pipeline, and realizes the preset ammonia hydrogen mixing ratio of the engine by adjusting the direct supply of ammonia fuel;

[0064] Reference Figure 3 , the structural block diagram of the PID control algorithm transfer function;

[0065] The software algorithm adopts PID control, and its transfer function is as follows:

[0066] G C (s) = [(1 + T d s) / (1+εT d s)][K p +(K p / T i s)]

[0067] Among them, T d is the differential time constant, ε is the differential gain, K p is the magnification factor, T i is the integration time constant.

[0068] Furthermore, the digital signal processor 25 obtains the operating condition of the internal combustion engine 5 through the speed sensor 22 and the crankshaft position sensor 23, obtains the fuel state at the inlet of the internal combustion engine through the temperature, flow and pressure sensors, and obtains the gas state of the outlet pipeline of the ammonia hydrogen buffer tank through the pressure and flow sensors and the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument 17.

[0069] Furthermore, the digital signal processor 25 obtains real-time data through the third temperature sensor 13 to control the flow rate of the heat transfer medium of the cooler 4;

[0070] The digital signal processor 25 obtains real-time data through the first temperature sensor 11 and the second temperature sensor 12 to control the heating temperature of the ammonia catalytic reactor 3;

[0071] The digital signal processor 25 obtains real-time data through the flow sensor to control the first ammonia flow regulating valve 8;

[0072] The digital signal processor 25 determines whether abnormal combustion such as knocking occurs in the cylinder of the internal combustion engine through the knock sensor 21 .

[0073] Further, the digital signal processor 25 is composed of four-channel A / D and four-channel D / A converters and an ATD-C25-F development board;

[0074] The CPU in the ATD-C25-F development board is a 32-bit digital signal processor TMS320C25, with a clock frequency of 40MHz;

[0075] With the support of system software, the development board can realize hardware debugging and software development of the target system. Its command format is compatible with the PCDEBUG command format, which can conveniently and reliably develop and debug the hardware and software of the user system.

[0076] The A / D converter uses the 12-bit high-speed device AD678KD with a conversion frequency of 200kHz. The AD678KD is designed to work in bipolar synchronous mode, and the data is input from the lower 12 bits.

[0077] The D / A conversion chip uses a 12-bit D / A conversion chip DAC1210 with a current settling time of 1μs. It is designed to work in bipolar mode and data is output from the upper 12 bits.

[0078] Furthermore, G. C (s) implemented by a digital signal processor 25 and converted into a discrete control algorithm;

[0079] Using the differential-first process, the sampling period T is obtained by the differential-difference mapping design method. The output quantities at the nth sampling moment are:

[0080] u0(n)=k1u0(n-1)+k2u e -k3u e (n-1)

[0081] u1(n)=K p u0(n)

[0082] u2(n)=u2(n-1)+k4u0(n)

[0083] u c (n)=u1(n)+u2(n)

[0084] k1=εT d / (T+εT d )

[0085] k2=(T+T d ) / (T+εT d )

[0086] k3=T d / (T+εT d )

[0087] k4=K p T / T i

[0088] Among them, u e is the system input, u0, u1, u2, u c are the differential link, proportional link, integral link and the final output value of the system respectively. k1, k2, k3 and k4 are the gains of the system at the previous moment, differential link, proportional link and integral link respectively. K p is the amplification factor, ε is the differential gain, T d is the differential time constant, T i is the integration time constant.

[0089] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0090] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of software functional units. The above is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of this application, or directly or indirectly used in other related technical fields, is also included in the patent protection scope of the present application.

[0091] The specific implementation methods of the invention are described in detail above, but they are only examples, and the present application is not limited to the specific implementation methods described above. For those skilled in the art, any equivalent modification or substitution of the invention is also within the scope of the present application, and therefore, the equalization, modification, and improvement made without departing from the spirit and principle of the present application should be included in the scope of the present application.

Claims

1. A marine ammonia catalytic hydrogen production system, It is characterized in that include: Ammonia catalytic hydrogen production reaction system and ammonia hydrogen mixing ratio control system; The ammonia catalytic hydrogen production reaction system comprises an ammonia fuel tank, a gasifier (1), a flue gas waste heat heater (2), an ammonia catalytic reactor (3), a cooler (4) and an ammonia hydrogen buffer tank; The ammonia-hydrogen mixing ratio control system also includes a temperature sensor, a pressure sensor, a flow sensor, a knock sensor (21), a rotation speed sensor (22), a crankshaft position sensor (23), an ammonia-nitrogen-hydrogen ratio ultrasonic online measuring instrument (17), a digital signal processor (25) and a flow and pressure regulating valve actuator.

2. A marine ammonia catalytic hydrogen production system according to claim 1, It is characterized in that Also includes: The ammonia fuel direct channel at the inlet of the internal combustion engine, liquid ammonia flows out from the ammonia fuel tank through the gasifier (1) and is divided into two paths, one path enters the flue gas waste heat heater (2) for heating, enters the ammonia catalytic reactor (3) for cracking reaction, the mixed gas enters the cooler (4), and finally flows into the ammonia hydrogen buffer tank; the other path does not undergo catalytic cracking reaction, is used to add into the mixed gas to complete the balancing of the preset ammonia hydrogen mixing ratio, and is used for the internal combustion engine (5).

3. A marine ammonia catalytic hydrogen production system according to claim 1, It is characterized in that An ammonia flow sensor (24) and a first ammonia flow regulating valve (8) are installed in the ammonia fuel direct passage; The ammonia fuel reaction passage is installed on the second ammonia flow regulating valve (7); the third temperature sensor (13) and the first flow sensor (14) are installed after the flue gas waste heat heater (2), the ammonia catalytic reactor (3) and the cooler (4); the outlet pipeline of the ammonia hydrogen buffer tank is installed with the first pressure sensor (18), the second flow sensor (15), the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument (17) and the third ammonia flow regulating valve (9).

4. A marine ammonia catalytic hydrogen production system according to claim 1, It is characterized in that The digital signal processor (25) inputs signals from the second temperature sensor (12), the third pressure sensor (20), the third flow sensor (16), the knock sensor (21), the rotation speed sensor (22), the crankshaft position sensor (23), and the ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument (17), and outputs signals to control the flow, the pressure regulating valve actuator, the heating temperature of the ammonia catalytic reactor (3), and the heat exchange medium flow of the cooler (4).

5. A marine ammonia catalytic hydrogen production system according to claim 1, It is characterized in that The heat exchange medium used in the gasifier (1) is a 50% water-ethylene glycol solution; The heat exchange medium used in the cooler (4) is a 50% water-ethylene glycol solution.

6. A hydrogen production system using the marine ammonia catalytic hydrogen production system control method according to any one of claims 1 to 5, It is characterized in that include: The digital signal processor (25) controls the first ammonia flow regulating valve (8) of the ammonia flow direct channel, the second ammonia flow regulating valve (7) of the ammonia reaction channel, and the pressure regulating valve (10) in real time according to the internal combustion engine operating conditions, the fuel state at the inlet, and the gas state of the ammonia hydrogen buffer tank outlet pipeline, and realizes the preset ammonia hydrogen mixing ratio of the engine by adjusting the direct supply of ammonia fuel; The software algorithm adopts PID control, and its transfer function is as follows: G C (s)=[(1+T d s) / (1+εT d s)][K p +(K p / T i s)] Among them, T d is the differential time constant, ε is the differential gain, K p is the magnification factor, T i is the integration time constant.

7. A control method for a marine ammonia catalytic hydrogen production system according to claim 6, It is characterized in that The digital signal processor (25) obtains the operating condition of the internal combustion engine (5) through a rotation speed sensor (22) and a crankshaft position sensor (23), obtains the fuel state at the inlet of the internal combustion engine through temperature, flow and pressure sensors, and obtains the gas state of the outlet pipeline of the ammonia hydrogen buffer tank through pressure and flow sensors and an ammonia nitrogen hydrogen ratio ultrasonic online measuring instrument (17).

8. A control method for a marine ammonia catalytic hydrogen production system according to claim 7, It is characterized in that The digital signal processor (25) obtains real-time data through the third temperature sensor (13) to control the flow rate of the heat transfer medium of the cooler (4); The digital signal processor (25) acquires real-time data through the temperature sensors, the first temperature sensor (11) and the second temperature sensor (12), to control the heating temperature of the ammonia catalytic reactor (3); The digital signal processor (25) obtains real-time data through the third flow sensor (16) to control the first ammonia flow regulating valve (8); The digital signal processor (25) determines whether abnormal combustion such as knocking occurs in the cylinder of the internal combustion engine through the knock sensor (21).

9. A control method for a marine ammonia catalytic hydrogen production system according to claim 8, It is characterized in that The digital signal processor (25) is composed of four-channel A / D and four-channel D / A converters and an ATD-C25-F development board; The CPU in the ATD-C25-F development board is a 32-bit digital signal processor TMS320C25, with a clock frequency of 40MHz; With the support of system software, the development board can realize hardware debugging and software development of the target system. Its command format is compatible with the PCDEBUG command format, which can conveniently and reliably develop and debug the hardware and software of the user system. The A / D converter uses the 12-bit high-speed device AD678KD with a conversion frequency of 200kHz. The AD678KD is designed to work in bipolar synchronous mode, and the data is input from the lower 12 bits. The D / A conversion chip uses a 12-bit D / A conversion chip DAC1210 with a current settling time of 1μs. It is designed to work in bipolar mode and data is output from the upper 12 bits.

10. A control method for a marine ammonia catalytic hydrogen production system according to claim 9, It is characterized in that G C (s) using a digital signal processor (25) to implement a discrete control algorithm; Using the differential-first process, the sampling period T is obtained by the differential-difference mapping design method. The output quantities at the nth sampling moment are: u 0 (n)=k 1 u 0 (n-1)+k 2 u e -k 3 u e (n-1) u 1 (n)=K p u 0 (n) u 2 (n)=u 2 (n-1)+k 4 u 0 (n) u c (n)=u 1 (n)+u 2 (n) k 1 =εT d / (T+εT d ) k 2 =(T+T d ) / (T+εT d ) k 3 =T d / (T+εT d ) k 4 =K p T / T i Among them, u e is the system input, u 0 、u 1 、u 2 、u c They are the differential link, proportional link, integral link and the final output value of the system, k 1 , k 2 , k 3 , k 4 are the gains of the system at the previous moment, differential link, proportional link, and integral link, respectively, K p is the amplification factor, ε is the differential gain, T d is the differential time constant, T i is the integration time constant.

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