A methanol engine and fuel cell hybrid power system for an inland waterway vessel and a method for operating the same

Abstract

The application discloses a methanol water hydrolysis hydrogen methanol engine and fuel cell hybrid power system for inland river ships and an operation control method thereof, and belongs to the technical field of hybrid power propulsion. The application solves the problem of the difficulty in the application of hydrogen fuel and methanol engine on medium and large ships. A submerged liquid pump is installed in a methanol storage tank and is responsible for delivering methanol to an evaporator and a methanol engine. The evaporator generates methanol vapor for a reactor, and a water vapor generator provides water vapor. The reactor generates hydrogen-rich synthesis steam into a separator, and water vapor and hydrogen-rich synthesis gas are separated. The hydrogen-rich synthesis gas is treated by a buffer tank and a purifier and is delivered to the methanol engine and the hydrogen fuel cell respectively. Waste gas generated by the methanol engine and the hydrogen fuel cell is discharged to the atmosphere, the methanol engine drives a generator through a transmission shaft, and the electric energy generated by the generator and the hydrogen fuel cell is connected to the ship power grid after AC / DC conversion. The application realizes efficient energy utilization and high reliability of the power system of the inland river ship.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hybrid propulsion, in particular to a methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system suitable for inland river ships. BACKGROUND

[0002] Methanol, as a low-carbon and easy-to-synthesize fuel, is one of the best ways to achieve deep carbon emission reduction in the field of ships. However, methanol has large latent heat of vaporization and slow combustion speed, and spark-ignition methanol engines have incomplete combustion, resulting in reduced engine thermal efficiency and increased unconventional emissions. Currently, methanol engines are prone to unstable combustion at low loads and are susceptible to knock at high loads.

[0003] Hydrogen fuel cells use high-purity hydrogen as fuel, and the basic principle is the reverse reaction of water electrolysis, which supplies hydrogen and oxygen to the anode and cathode respectively. After the hydrogen diffuses outward through the anode and reacts with the electrolyte, the electrons are emitted to the cathode through the external load. Hydrogen fuel cells use electrochemical reaction to directly convert the chemical energy of hydrogen and oxygen into chemical energy, and are not limited by the theoretical Carnot cycle in the energy conversion process, with high thermal efficiency (up to 60% or more, and heat and power cogeneration capacity up to 90%) and large energy density (up to 4kW / L). It has a bright application prospect on ships. However, fuel cell thermal management is a very important point, and achieving rapid reduction of hydrogen fuel cell circulating water is an important link in thermal management.

[0004] Hydrogen has a fast combustion rate and a small ignition energy, and its blending with methanol can effectively improve the combustion process of methanol engines, reduce the generation of unconventional emissions, and improve engine power performance, economic performance, and emission performance. Hydrogen fuel cells have high thermal efficiency (up to 60% or more, and heat and power cogeneration capacity up to 90%), but the single-stack power of hydrogen fuel cells is small (200-300kW), which greatly limits their application on medium and large ships. In addition, due to storage and transportation problems, the application of hydrogen on ships has been greatly limited. Therefore, how to realize the application of hydrogen and fuel cells on medium and large ships has been a problem that needs to be solved in this field. SUMMARY

[0005] The present application proposes an inland river ship methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system and its operation control method, which solves the problems of hydrogen fuel storage and transportation difficulties on ships, poor power performance of methanol engines, and difficulties in applying hydrogen fuel cells on medium and large ships.

[0006] The methanol water hydrolysis hydrogen engine and fuel cell hybrid power system of the inland ship comprises a submerged pump, a methanol storage tank, a vaporizer, a water vapor generator, a reactor, a separator, a buffer tank, a purifier, a methanol engine, a generator, a ship power grid, a hydrogen fuel cell and an AC / DC converter, the submerged pump is arranged in the methanol storage tank, the outlet of the submerged pump is in communication with the fuel inlet of the vaporizer and the methanol inlet of the methanol engine, the methanol vapor outlet of the vaporizer is in communication with the methanol vapor inlet of the reactor, the water vapor outlet of the water vapor generator is in communication with the water vapor inlet of the reactor, the hydrogen-rich synthesis steam outlet of the reactor is in communication with the hydrogen-rich synthesis steam inlet of the separator, the water vapor outlet of the separator is in communication with the methanol vapor inlet of the reactor, the hydrogen-rich synthesis gas outlet of the separator is in communication with the inlet of the buffer tank, the outlet of the buffer tank is in communication with the inlet of the purifier, the low-purity hydrogen synthesis gas outlet of the purifier is in communication with the low-purity hydrogen synthesis gas inlet of the methanol engine, the low-purity hydrogen synthesis gas pipeline of the purifier is connected with the atmosphere through a valve, the high-purity hydrogen outlet of the purifier is in communication with the high-purity hydrogen inlet of the hydrogen fuel cell, the methanol engine and the hydrogen fuel cell are in communication with the atmosphere, the methanol engine is fixedly connected with the generator through a transmission shaft, the generator is electrically connected with the ship power grid, the hydrogen fuel cell is electrically connected with the AC / DC converter, and the AC / DC converter is electrically connected with the ship power grid.

[0007] Further, the methanol engine comprises an air inlet, a turbocharger, a fuel gas common rail pipe, an engine cylinder and an exhaust pipe, one branch of the outlet of the submerged pump is in communication with the inlet of the air inlet of the methanol engine, the air inlet introduces external air through the turbocharger, and the outlet of the air inlet is in communication with the inside of the engine cylinder, the low-purity hydrogen synthesis gas outlet of the purifier is in communication with the inlet of the fuel gas common rail pipe of the methanol engine, the outlet of the fuel gas common rail pipe is in communication with the inside of the engine cylinder, the outlet of the engine cylinder is in communication with the inlet of the exhaust pipe, and the outlet of the exhaust pipe is in communication with the turbocharger.

[0008] Further, the inside of the reactor is provided with a waste gas heating pipeline, the outlet of the exhaust pipe is in communication with the inlet of the waste gas heating pipeline through the turbine part of the turbocharger, and the outlet of the waste gas heating pipeline is in communication with the atmosphere.

[0009] Further, the hydrogen fuel cell comprises a fuel cell anode, a fuel cell cathode, a fuel cell waste gas outlet, a fuel cell air inlet, a fuel cell reaction water outlet and a fuel cell hydrogen gas inlet, the fuel cell anode and the fuel cell cathode are electrically connected with the positive and negative electrode interfaces of the AC / DC converter respectively, the fuel cell air inlet is in communication with the atmosphere, the fuel cell hydrogen gas inlet is in communication with the high-purity hydrogen outlet of the purifier, and the fuel cell waste gas outlet and the fuel cell reaction water outlet are both in communication with the atmosphere.

[0010] Further, the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland waterway vessels further comprises a cooling water storage tank, the hydrogen fuel cell further comprises a fuel cell cooling system low temperature water inlet and a fuel cell cooling system high temperature water outlet, both of which are arranged on the shell of the hydrogen fuel cell and are connected through a water circulation cavity inside the hydrogen fuel cell, the evaporator is internally provided with a heat exchange pipeline, the inlet of the heat exchange pipeline is connected with the fuel cell cooling system high temperature water outlet, the outlet of the heat exchange pipeline is connected with the inlet of the cooling water storage tank, and the outlet of the cooling water storage tank is connected with the fuel cell cooling system low temperature water inlet.

[0011] Further, the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland waterway vessels further comprises a first methanol stop valve and a second methanol stop valve, which are respectively installed in two pipelines formed by the outlet of the submerged pump and the fuel inlet of the evaporator.

[0012] Further, the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland waterway vessels further comprises an automatic heating device arranged in the reactor.

[0013] A running method of a methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland waterway vessels, based on the above-mentioned methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland waterway vessels, the methanol storage tank is internally provided with liquid methanol, the submerged pump pumps the liquid methanol in the methanol storage tank into the evaporator, the evaporator vaporizes the liquid methanol, the methanol vapor and the water vapor generated by the water vapor generator flow into the reactor, the methanol vapor and the water vapor undergo a hydrolysis reaction in the reactor to generate hydrogen-rich synthesis vapor containing water vapor, the hydrogen-rich synthesis vapor flows into the separator to separate the water vapor from the hydrogen-rich synthesis gas, the water vapor flows back into the reactor to continue the hydrolysis reaction, the hydrogen-rich synthesis gas flows into the purifier through the buffer tank, the purifier purifies the hydrogen-rich synthesis gas into high-purity hydrogen and low-purity hydrogen synthesis gas, the high-purity hydrogen and the air entering through the fuel cell air inlet undergo an electrochemical reaction in the hydrogen fuel cell to generate direct current to the AC / DC converter, the water and the exhaust gas after the reaction flow out of the hydrogen fuel cell through the fuel cell reaction water outlet and the fuel cell exhaust gas outlet,

[0014] The low hydrogen synthesis gas from the purifier is injected into the engine cylinder through the low pressure injection mode of the gas common rail pipe, the submerged pump is connected with the methanol engine intake passage, the liquid methanol is injected through the intake passage, mixed with air to form a combustible mixture into the cylinder, mixed with the low hydrogen synthesis gas to burn and work, the burned exhaust gas enters the turbocharger to work, the high temperature exhaust gas after work enters the reactor to provide energy for the methanol hydrolysis reaction, and then enters the atmosphere environment, the automatic heating device assists in heating the inside of the reactor when the exhaust gas turbine waste heat of the engine is insufficient, the low temperature water in the cooling water storage tank flows into the hydrogen fuel cell, circulates in the cavity inside the hydrogen fuel cell, absorbs the heat of the hydrogen fuel cell to dissipate heat, and is converted into high temperature water which flows out through the high temperature water outlet of the fuel cell cooling system, the high temperature water enters the heat exchange pipeline of the evaporator to release heat to the methanol liquid to exchange heat, the low temperature water after heat exchange circulates into the cooling water storage tank, the fuel cell anode and fuel cell cathode output direct current to the AC / DC converter, which is converted into alternating current and enters the ship power grid, the methanol engine is connected with the generator through the transmission shaft to drive the generator to generate electricity, and the generator generates alternating current which enters the ship power grid.

[0015] A storage medium, the storage medium has a computer program stored thereon, the computer program is executed by a processor to implement the operation control method of the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship.

[0016] A computer device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executes the program to implement the operation control method of the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1. The methanol hydrolysis hydrogen production system can produce hydrogen online according to real-time demand, solving the problem of hydrogen storage and transportation on ships.

[0019] 2. The present application can fully utilize the waste heat of the methanol engine and the heat of the high temperature cooling water of the fuel cell to heat the reactor and the evaporator respectively, thereby improving the energy utilization rate, rapidly reducing the temperature of the fuel cell cooling water, and improving the cooling efficiency of the fuel cell.

[0020] 3. The present application uses hydrogen in low hydrogen synthesis gas to improve the combustion rate of methanol, improves the combustion instability of methanol engine at low load, uses carbon dioxide in low hydrogen synthesis gas to suppress the knock tendency of methanol engine, reduces the knock intensity of methanol engine at full load, and can further improve the hydrogen doping upper limit of methanol engine. The power performance, economic performance and emission performance of the methanol engine after blending and burning are better.

[0021] 4. The present application comprehensively utilizes fuel cells and methanol engines, combines the advantages and disadvantages of both, the fuel cell has higher thermal efficiency (up to more than 60%, and the combined heat and power can reach 90%), but the maximum fuel cell single stack power is currently 200-300kW, which cannot be applied to medium and large ships, while the methanol engine has large single machine power (can reach more than 2000kW), but the thermal efficiency is low (about 40%). The fuel cell-methanol engine power system proposed by the present application can be applied to medium and large ships on inland rivers, and the overall system operation efficiency can be higher. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic diagram of a methanol engine and fuel cell hybrid power system for methanol water hydrolysis hydrogen production of an inland ship of the present application.

[0023] Figure 2 It is an operation control method of a methanol engine and fuel cell hybrid power system for methanol water hydrolysis hydrogen production of an inland ship of the present application.

[0024] Among them, 1 is a submersible pump, 2 is a methanol storage tank, 3 is a first methanol stop valve, 4 is a second methanol stop valve, 5 is an evaporator, 6 is a water vapor generator, 7 is a reactor, 8 is an automatic heating device, 9 is a separator, 10 is a buffer tank, 11 is a purifier, 12 is an air inlet, 13 is a turbocharger, 14 is a common rail pipe, 15 is an engine cylinder, 16 is an exhaust pipe 16, 17 is a generator, 18 is a ship power grid, 19 is a hydrogen fuel cell, 20 is an AC / DC converter, 21 is a fuel cell anode, 22 is a fuel cell cathode, 23 is a fuel cell exhaust gas outlet, 24 is a fuel cell air inlet, 25 is a fuel cell reaction water outlet, 26 is a fuel cell cooling system low-temperature water inlet, 27 is a fuel cell hydrogen inlet, 28 is a fuel cell cooling system high-temperature water outlet, and 29 is a cooling water storage tank. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0026] REFERENCE Figure 1As shown, a methanol water hydrolysis hydrogen methanol engine and fuel cell hybrid power system for inland waterway vessels includes a submerged liquid pump 1, a methanol storage tank 2, an evaporator 5, a water vapor generator 6, a reactor 7, a separator 9, a buffer tank 10, a purifier 11, a methanol engine, a generator 17, a ship power grid 18, a hydrogen fuel cell 19, and an AC / DC converter 20. The submerged liquid pump 1 is arranged in the methanol storage tank 2. The outlet of the submerged liquid pump 1 is in communication with the fuel inlet of the evaporator 5 and the methanol inlet of the methanol engine. The methanol vapor outlet of the evaporator 5 is in communication with the methanol vapor inlet of the reactor 7. The water vapor outlet of the water vapor generator 6 is in communication with the water vapor inlet of the reactor 7. The hydrogen-rich synthesis vapor outlet of the reactor 7 is in communication with the hydrogen-rich synthesis vapor inlet of the separator 9. The water vapor outlet of the separator 9 is in communication with the methanol vapor inlet of the reactor 7. The hydrogen-rich synthesis gas outlet of the separator 9 is in communication with the inlet of the buffer tank 10. The outlet of the buffer tank 10 is in communication with the inlet of the purifier 11. The low-purity hydrogen synthesis gas outlet of the purifier 11 is in communication with the low-purity hydrogen synthesis gas inlet of the methanol engine. The low-purity hydrogen synthesis gas pipeline of the purifier 11 is connected to the atmosphere through a valve. The high-purity hydrogen outlet of the purifier 11 is in communication with the high-purity hydrogen inlet of the hydrogen fuel cell 19. The methanol engine and the hydrogen fuel cell 19 are both in communication with the atmosphere. The methanol engine is fixedly connected to the generator 17 through a transmission shaft. The generator 17 is electrically connected to the ship power grid 18. The hydrogen fuel cell 19 is electrically connected to the AC / DC converter 20. The AC / DC converter 20 is electrically connected to the ship power grid 18.

[0027] Specifically, the system of the present application adopts methanol hydrolysis hydrogen production technology, which can produce hydrogen gas on-line according to real-time demand, effectively solving the problem of hydrogen storage and transportation on ships. By utilizing the waste heat of the exhaust gas of the methanol engine and the high-temperature cooling water heat generated by the fuel cell, the system can heat the reactor 7 and the evaporator 5 at the same time, improving the energy utilization efficiency. And the system of the present application exchanges heat through the high-temperature cooling water output by the hydrogen fuel cell 19, realizes the rapid reduction of the cooling water temperature of the hydrogen fuel cell 19, thereby improving the cooling efficiency of the hydrogen fuel cell 19. In terms of methanol engine, by blending low-purity hydrogen synthesis gas, the combustion rate of the methanol engine is improved, the combustion stability at low load is improved, and the knocking phenomenon at high load is inhibited by using the carbon dioxide component, thereby improving the power performance, economic performance and emission performance of the methanol engine. The present application combines the advantages of fuel cells and methanol engines. Fuel cells have high thermal efficiency (up to more than 60%, and the combined heat and power generation capacity can reach 90%), while methanol engines have large single-machine power (more than 2000kW). This hybrid power configuration can be applied to medium and large ships, and can improve the overall operation efficiency of the system. Methanol engine and hydrogen fuel cell can meet the heating demand of heat users under different conditions, and have good environmental adaptability. By optimizing the combustion process and improving the energy conversion efficiency, the system of the present application helps to reduce pollutant emissions and improve the environmental performance of the ship.

[0028] Further, the methanol engine includes an air inlet 12, a turbocharger 13, a gas common rail pipe 14, an engine cylinder 15 and an exhaust pipe 16. One branch of the outlet of the submerged pump 1 is communicated with the inlet of the air inlet 12 of the methanol engine. The air inlet 12 introduces external air through the turbocharger 13, and the outlet of the air inlet 12 is communicated with the inside of the engine cylinder 15. The low-purity hydrogen synthesis gas outlet of the purifier 11 is communicated with the inlet of the gas common rail pipe 14 of the methanol engine. The outlet of the gas common rail pipe 14 is communicated with the inside of the engine cylinder 15. The outlet of the engine cylinder 15 is communicated with the inlet of the exhaust pipe 16. The outlet of the exhaust pipe 16 is communicated with the turbocharger 13.

[0029] Specifically, the present application improves the performance and efficiency in multiple aspects by careful configuration of the methanol engine. Specifically, the present application improves the intake efficiency and combustion conditions, and improves the intake amount and pressure through the turbocharger 13, thereby optimizing the combustion efficiency. At the same time, the introduction of the gas common rail pipe 14 ensures the uniform distribution of low-purity hydrogen synthesis gas in the engine cylinder 15, thereby improving the combustion efficiency and the balance of power output. In addition, the precisely controlled injection system reduces harmful emissions and improves environmental performance. The design of the exhaust pipe 16 not only reduces heat loss, but also further improves the energy utilization efficiency of the system by reusing the exhaust gas.

[0030] Further, the inside of the reactor 7 is provided with a waste gas heating pipeline, the outlet of the exhaust pipe 16 is communicated with the inlet of the waste gas heating pipeline through the turbine part of the turbocharger 13, and the outlet of the waste gas heating pipeline is communicated with the atmosphere.

[0031] Specifically, by integrating the waste gas heating pipeline in the reactor 7 and connecting it with the exhaust pipe 16 and the turbine part of the turbocharger 13, the effective recovery and utilization of waste heat energy are realized, which not only improves the heat energy utilization efficiency and promotes the methanol hydrolysis reaction, but also strengthens the internal heat management of the system and reduces the demand for additional auxiliary heating equipment. At the same time, the working performance and response speed of the system under different environmental temperatures are improved, and the environmental adaptability is enhanced.

[0032] Further, the hydrogen fuel cell 19 includes a fuel cell anode 21, a fuel cell cathode 22, a fuel cell waste gas outlet 23, a fuel cell air inlet 24, a fuel cell reaction water outlet 25 and a fuel cell hydrogen inlet 27, the fuel cell anode 21 and the fuel cell cathode 22 are respectively electrically connected with the positive and negative poles of the AC / DC converter 20, the fuel cell air inlet 24 is communicated with the atmosphere, the fuel cell hydrogen inlet 27 is communicated with the high-purity hydrogen outlet of the purifier 11, and the fuel cell waste gas outlet 23 and the fuel cell reaction water outlet 25 are both communicated with the atmosphere.

[0033] Specifically, the careful design of the hydrogen fuel cell 19 in the present application realizes efficient energy conversion and environmentally friendly emission. The electrical connection of the fuel cell anode 21 and the fuel cell cathode 22 with the AC / DC converter 20 ensures that the direct current generated by the electrochemical reaction of hydrogen and oxygen is efficiently converted and transmitted to the ship power grid. At the same time, the hydrogen inlet 27 is connected with the high-purity hydrogen outlet of the purifier 11, which ensures the pure supply of hydrogen fuel, and the open air inlet 24 ensures the continuous supply of oxygen. The setting of the fuel cell waste gas outlet 23 and the reaction water outlet 25 enables the safe and environmentally friendly discharge of waste gas and water into the atmosphere.

[0034] Further, the inland ship methanol hydrolysis hydrogen methanol engine and fuel cell hybrid power system further comprises a cooling water storage tank 29, the hydrogen fuel cell 19 further comprises a fuel cell cooling system low-temperature water inlet 26 and a fuel cell cooling system high-temperature water outlet 28, the fuel cell cooling system low-temperature water inlet 26 and the fuel cell cooling system high-temperature water outlet 28 are both arranged on the shell of the hydrogen fuel cell 19 and are communicated through the water circulation cavity in the hydrogen fuel cell 19, the inside of the evaporator 5 is provided with a heat exchange pipeline, the inlet of the heat exchange pipeline is communicated with the fuel cell cooling system high-temperature water outlet 28, the outlet of the heat exchange pipeline is communicated with the inlet of the cooling water storage tank 29, and the outlet of the cooling water storage tank 29 is communicated with the fuel cell cooling system low-temperature water inlet 26.

[0035] Specifically, the present application realizes effective management of the heat generated by the hydrogen fuel cell 19 through the low-temperature water inlet 26 and the high-temperature water outlet 28 of the cooling system of the hydrogen fuel cell 19, prevents overheating, and ensures stable operation of the battery. The cooling water tank 29 forms a closed loop with the fuel cell cooling system, and the high-temperature water is led out from the hydrogen fuel cell 19, passes through the heat exchange pipeline in the evaporator 5, and transfers heat to methanol, realizing the reuse of heat energy. The design of the heat exchange pipeline makes the waste heat of the hydrogen fuel cell 19 available to heat the methanol, improving the energy utilization efficiency of the entire system. After losing heat, the high-temperature water reenters the hydrogen fuel cell 19 through the cooling water tank 29, forming a cycle, utilizing the large latent heat of methanol vaporization, realizing rapid cooling of the fuel cell cooling book, being more conducive to fuel cell thermal management, and realizing multi-stage utilization of heat, reducing energy loss, and improving the energy utilization efficiency of the entire system.

[0036] Further, the methanol water hydrolysis hydrogen engine and fuel cell hybrid power system of the inland ship further comprises a first methanol stop valve 3 and a second methanol stop valve 4, and the first methanol stop valve 3 and the second methanol stop valve 4 are respectively installed in two pipelines formed by the outlet of the submerged pump 1 and the air inlet 12 and the fuel inlet of the evaporator 5.

[0037] Specifically, in the methanol water hydrolysis hydrogen engine and fuel cell hybrid power system of the inland ship, the first methanol stop valve 3 and the second methanol stop valve 4 are added, and the two stop valves are respectively installed on the pipelines between the outlet of the submerged pump 1 and the air inlet 12 and the fuel inlet of the evaporator 5, providing precise control of the flow of methanol, thereby enhancing the operation flexibility and safety of the system. In an emergency, they can quickly cut off the methanol supply to prevent leakage and ensure safe operation of the system. At the same time, the independently controlled stop valves facilitate system maintenance and repair, improving maintenance efficiency and reducing costs. In addition, by adjusting the stop valves, the system can quickly respond to changes in methanol supply demand, maintaining the stability and reliability of operation.

[0038] Further, the methanol water hydrolysis hydrogen engine and fuel cell hybrid power system of the inland ship further comprises an automatic heating device 8, and the automatic heating device 8 is arranged in the reactor 7.

[0039] Specifically, the automatic heating device 8 is located inside the reactor 7, which enhances the system's self-sufficiency in thermal energy under various environmental temperatures, ensuring the efficiency and speed of the methanol hydrolysis reaction; when the waste gas heat is insufficient, the automatic heating device 8 can supplement the heat in time to ensure the continuity and stability of the reaction; at the same time, it improves the system's adaptability to different climate conditions, optimizes the internal utilization and distribution of energy, improves the level of automated control, avoids unnecessary waste of energy, and thus improves the overall energy efficiency and reliability of the system, ensuring that the ship power system can operate efficiently and stably under diversified operating conditions.

[0040] An operation control method of a methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland river ships, based on the above-mentioned methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system for inland river ships, the principle is: the methanol storage tank 2 is provided with liquid methanol, the submersible pump 1 pumps the liquid methanol in the methanol storage tank 2 into the evaporator 5, the evaporator 5 vaporizes the liquid methanol, the methanol vapor flows into the reactor 7, and the water vapor generated by the water vapor generator 6 also flows into the reactor 7, the methanol vapor and water vapor in the reactor 7 undergo hydrolysis reaction to generate hydrogen-rich synthesis steam containing water vapor, the hydrogen-rich synthesis steam flows into the separator 9, the water vapor is separated from the hydrogen-rich synthesis gas, the water vapor flows back into the reactor 7 to continue the hydrolysis reaction, and the hydrogen-rich synthesis gas flows into the purifier 11 through the buffer tank 10, the purifier 11 purifies the hydrogen-rich synthesis gas into high-purity hydrogen and low-purity hydrogen synthesis gas, the high-purity hydrogen undergoes electrochemical reaction with the air entering through the fuel cell air inlet 24 in the hydrogen fuel cell 19 to generate direct current to the AC / DC converter 20, the water and waste gas after the reaction flow out of the hydrogen fuel cell 19 through the fuel cell reaction water outlet 25 and the fuel cell waste gas outlet 23,

[0041] The low hydrogen synthesis gas from the purifier 11 is injected into the engine cylinder 15 through the gas common rail pipe 14 by low pressure injection. The liquid pump 1 is connected to the methanol engine intake duct 12. The liquid methanol is injected through the intake duct 12, mixed with air to form a combustible mixture, and enters the cylinder 15 to mix and burn with the low hydrogen synthesis gas, and then the exhaust gas enters the turbocharger 13 to do work. The high temperature exhaust gas after work enters the reactor 7 to provide energy for the methanol hydrolysis reaction, and then enters the atmospheric environment. The automatic heating device 8 assists in heating the inside of the reactor 7 when the engine exhaust turbine waste heat is insufficient. The low temperature water in the cooling water storage tank 29 flows into the hydrogen fuel cell 19, circulates in the cavity inside the hydrogen fuel cell 19, absorbs the heat of the hydrogen fuel cell 19 to dissipate heat, and is converted into high temperature water which flows out through the fuel cell cooling system high temperature water outlet 28. The high temperature water enters the heat exchange pipeline of the evaporator 5 to release heat to the methanol liquid for heat exchange. The low temperature water after heat exchange circulates into the cooling water storage tank 29. The fuel cell anode 21 and the fuel cell cathode 22 output direct current to the AC / DC converter 20, which is converted into alternating current and enters the ship power grid 18. The methanol engine is connected to the generator 17 through the transmission shaft to drive the generator 17 to generate electricity. The generator 17 generates alternating current which enters the ship power grid 18.

[0042] The active heating device 8 in the reactor 7 and the synthesis gas supplied to the methanol engine from the purifier 11 are separated and automatically adjusted according to the system load. The operation control method includes low load condition, medium load condition and high load condition.

[0043] High load condition: The propulsion system load is 70%-100%, and the methanol engine and the hydrogen fuel cell 19 are needed to jointly propel. The automatic heating device 8 is started. The energy required for the methanol hydrolysis reaction is provided by the exhaust gas of the methanol engine and the automatic heating device 8. The purifier 11 provides sufficient high purity hydrogen gas to the hydrogen fuel cell 19. The remaining synthesis gas enters the methanol engine to participate in combustion. At this time, the fuel cell operates in full load condition and consumes a large amount of high purity hydrogen gas. The hydrogen content of the synthesis gas entering the methanol engine is low, and the carbon dioxide content is high. The use of carbon dioxide can inhibit the knock tendency of the methanol blended engine and further improve the amount of hydrogen blended with the methanol engine.

[0044] Medium load condition: The propulsion system load is 40%-70%, and the methanol engine and the fuel cell are needed to jointly propel. The automatic heating device 8 is closed. The energy for the methanol hydrolysis reaction is provided by the exhaust gas of the methanol engine alone. At this time, the hydrogen fuel cell 19 operates in medium load condition. The purifier 11 provides sufficient high purity hydrogen gas to the hydrogen fuel cell 19. The remaining synthesis gas enters the engine. The use of hydrogen gas improves the combustion of methanol and improves the combustion characteristics of the methanol engine to improve the combustion thermal efficiency of the methanol engine.

[0045] Low load condition: the propulsion system load is 0%-40%, which is divided into two modes of methanol engine / fuel cell common propulsion and fuel cell single propulsion, and the control method is as follows:

[0046] Methanol engine / fuel cell common propulsion mode: start the automatic heating device 8, the methanol hydrolysis reaction energy is provided by the methanol engine exhaust and the automatic heating device 8, at this time, the hydrogen fuel cell 19 operating load is determined by the overall propulsion system, the hydrogen content of the synthetic gas to the methanol engine is high, the hydrogen is burned rapidly, the low load combustion stability of the methanol engine is improved, and the cycle fluctuation rate during the operation of the methanol engine is reduced;

[0047] Fuel cell single propulsion mode: close the methanol engine, start the automatic heating device 8, the methanol hydrolysis reaction energy is provided by the automatic heating device 8 alone, the hydrogen purifier 11 separates hydrogen for the hydrogen fuel cell 19, and the separated carbon dioxide is discharged to the atmosphere.

[0048] Specifically, the methanol storage tank 2 is arranged with a submerged pump 1, which is connected with the fuel inlet end of the evaporator 5 through a pipeline. The vaporized methanol vapor flows into the reactor 7 from the outlet end of the evaporator 5. The water vapor generator 6 stores water and can generate water vapor to flow into the reactor 7. The methanol vapor and the water vapor occur hydrolysis reaction in the reactor 7 to generate hydrogen-rich synthesis vapor containing water vapor. The hydrogen-rich synthesis vapor flows into the separator 9 to separate the water vapor from the hydrogen-rich synthesis gas. The water vapor flows into the reactor 7 to continue the hydrolysis reaction, and the hydrogen-rich synthesis gas flows into the buffer tank 10. The hydrogen-rich synthesis gas in the buffer tank 10 continues to flow into the purifier 11 to be purified into high-purity hydrogen and low-hydrogen synthesis gas. The high-purity hydrogen occurs electrochemical reaction with the air entering through the fuel cell air inlet 24 via the fuel cell hydrogen inlet 27. The reacted water and waste gas flow out of the fuel cell via the fuel cell reaction water outlet 25 and the fuel cell waste gas outlet 23. The low-hydrogen synthesis gas flowing out of the purifier 11 is injected into the cylinder 15 through the gas common rail pipe 14 in a low-pressure injection manner. The submerged pump 1 is connected with the methanol engine intake port 12. The liquid methanol is injected through the intake port 12, mixed with air to form combustible mixture, enters the engine cylinder 15, is mixed with the low-hydrogen synthesis gas and burns. The burned waste gas enters the turbocharger 13 through the exhaust pipe 16 to do work. The high-temperature waste gas after work continues to enter the reactor 7 to provide energy for the methanol hydrolysis reaction, and then enters the atmospheric environment. The reactor 7 is arranged with an automatic heating device 8 to assist heating when the engine waste gas turbine waste heat is insufficient. The cooling water storage tank 29 is connected with the low-temperature water inlet 26 of the fuel cell cooling system. The water in the cooling water storage tank 29 flows into the fuel cell to dissipate heat, and flows out through the high-temperature water outlet 28 of the fuel cell cooling system. The high-temperature water enters the evaporator 5 to exchange heat with the liquid methanol. The low-temperature water after heat exchange circulates into the cooling water storage tank 29. The fuel cell anode 21 and the fuel cell cathode 22 output direct current to the AC / DC converter 20, which is converted into alternating current and enters the power grid. The methanol engine is connected with the generator 17 through a transmission shaft. The generator 17 generates alternating current to enter the ship power grid 18. The synthesis vapor after hydrolysis in the reactor 7 enters the separator 9 to be decomposed into water vapor and hydrogen-rich synthesis gas. The water vapor re-enters the reactor 7 for reaction. The separated hydrogen-rich synthesis gas enters the buffer tank 10. The synthesis gas in the buffer tank 10 forms high-purity hydrogen and low-hydrogen synthesis gas under the action of the purifier 11. The high-purity hydrogen enters the hydrogen fuel cell 19 to occur electrochemical reaction, and the low-hydrogen synthesis gas enters the engine cylinder 15 to burn and do work.The evaporator 5 uses the high-temperature water (70-100℃) flowing out of the fuel cell cooling system high-temperature water outlet 28 of the hydrogen fuel cell 19 to evaporate the methanol liquid (methanol boiling temperature is about 30℃) in the evaporator 5, realizing rapid vaporization of methanol and rapid cooling of fuel cell circulating water; the reactor 7 produces hydrogen by hydrolysis reaction with the water vapor generated by the water vapor generator 6, the hydrolysis process energy is provided by the exhaust gas flowing out of the turbocharger 13, the methanol hydrolysis reaction temperature is about 200-250℃, and the exhaust gas temperature after the turbocharger of the methanol engine is between 280-350℃. In addition, the reactor 7 is provided with an automatic heating device 8, which can assist in heating when the engine exhaust gas turbine waste heat is insufficient. The low-hydrogen synthesis gas flowing out of the purifier 11 contains carbon dioxide, hydrogen, carbon monoxide and incomplete hydrolysis of methanol vapor, which is injected into the engine cylinder 15 through the low-pressure injection mode of the gas common rail pipe 14, the submersible pump 1 is connected with the air intake duct 12 of the methanol engine, the liquid methanol is injected through the air intake duct 12, mixed with air to form a combustible mixture into the engine cylinder 15, and mixed with the low-hydrogen synthesis gas to burn, the hydrogen in the low-hydrogen synthesis gas burns faster, which can effectively improve the methanol combustion and improve the combustion instability of the methanol engine at low load, while the carbon dioxide can inhibit the knocking tendency of the methanol engine and reduce the knocking intensity of the methanol engine at full load. The power performance, economic performance and emission performance of the methanol engine after blending are better. The methanol engine drives the generator 17 through the output shaft to generate alternating current input into the ship power grid 18, and the direct current generated by the fuel cell 19 is converted into alternating current by the AC / DC converter 20 and input into the ship power grid 18.

[0049] A storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the above-mentioned method for operating and controlling a methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of an inland river ship.

[0050] Specifically, the technical scheme of the present application achieves efficient and automatic control of the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of an inland river ship by embedding a carefully designed computer program on a storage medium and executing the program by a processor. This method not only ensures the accuracy of the operation and reduces human error, but also enhances the reliability and stability of the system, simplifying the daily maintenance and management process. The quick response capability of the automated program enables the system to adapt to changes in the external environment and internal state in a timely manner, while intelligent control strategies such as fault self-diagnosis and adaptive adjustment further enhance the intelligence level of the system. In addition, this automated control method also improves the adaptability and energy utilization efficiency of the system, providing a flexible and efficient power system operation solution for ships.

[0051] The computer device comprises a memory, a processor and a computer program stored on the memory and executable on the processor, and the processor executes the program to realize the operation control method of the methanol engine and fuel cell hybrid power system of the methanol engine for hydrogen production by methanol decomposition of the inland ship.

[0052] Specifically, the computer device in the present application integrates memory, processor and special computer program, providing an automatic and intelligent control platform for the operation of the methanol engine and fuel cell hybrid power system of the methanol engine for hydrogen production by methanol decomposition of the inland ship. The device reduces human error through automatic control, enhances the stability and reliability of the system; intelligent management allows the system to optimize performance according to real-time data, simplifies the maintenance process and improves maintenance efficiency. At the same time, the quick response mechanism ensures that the system can adapt to various changes in time, and the precise energy allocation and use improves the overall energy efficiency. In addition, the flexibility of the program enables the system to adapt to changing operating conditions, enhancing environmental adaptability. In summary, the application of the computer device brings an efficient, stable and easy-to-manage operation mode to the ship power system, significantly improving energy utilization efficiency and overall system performance.

[0053] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An inland waterway ship methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system, characterized in that, The system comprises a submerged pump (1), a methanol storage tank (2), an evaporator (5), a water vapor generator (6), a reactor (7), a separator (9), a buffer tank (10), a purifier (11), a methanol engine, a generator (17), a ship power grid (18), a hydrogen fuel cell (19) and an AC / DC converter (20), characterized in that the submerged pump (1) is arranged in the methanol storage tank (2), the outlet of the submerged pump (1) is in communication with the fuel inlet of the evaporator (5) and the methanol inlet of the methanol engine, the methanol vapor outlet of the evaporator (5) is in communication with the methanol vapor inlet of the reactor (7), the water vapor outlet of the water vapor generator (6) is in communication with the water vapor inlet of the reactor (7), the hydrogen-rich synthesis gas outlet of the reactor (7) is in communication with the hydrogen-rich synthesis gas inlet of the separator (9), the water vapor outlet of the separator (9) is in communication with the methanol vapor inlet of the reactor (7), the hydrogen-rich synthesis gas outlet of the separator (9) is in communication with the inlet of the buffer tank (10), the outlet of the buffer tank (10) is in communication with the inlet of the purifier (11), the low-purity hydrogen synthesis gas outlet of the purifier (11) is in communication with the low-purity hydrogen synthesis gas inlet of the methanol engine, the low-purity hydrogen synthesis gas pipeline of the purifier (11) is connected to the atmosphere through a valve, the high-purity hydrogen outlet of the purifier (11) is in communication with the high-purity hydrogen inlet of the hydrogen fuel cell (19), the methanol engine and the hydrogen fuel cell (19) are both in communication with the atmosphere, the methanol engine is fixedly connected to the generator (17) through a transmission shaft, the generator (17) is electrically connected to the ship power grid (18), the hydrogen fuel cell (19) is electrically connected to the AC / DC converter (20), and the AC / DC converter (20) is electrically connected to the ship power grid (18).

2. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 1, characterized in that, The methanol engine comprises an air inlet (12), a turbocharger (13), a common rail (14), an engine cylinder (15) and an exhaust pipe (16), one branch of the outlet of the submerged pump (1) is in communication with the inlet of the air inlet (12) of the methanol engine, the air inlet (12) introduces external air through the turbocharger (13), and the outlet of the air inlet (12) is in communication with the inside of the engine cylinder (15), the low-purity hydrogen synthesis gas outlet of the purifier (11) is in communication with the inlet of the common rail (14) of the methanol engine, the outlet of the common rail (14) is in communication with the inside of the engine cylinder (15), the outlet of the engine cylinder (15) is in communication with the inlet of the exhaust pipe (16), and the outlet of the exhaust pipe (16) is in communication with the turbocharger (13).

3. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 2, wherein The inside of the reactor (7) is provided with a waste gas heating pipeline, the outlet of the exhaust pipe (16) is in communication with the inlet of the waste gas heating pipeline through the turbine part of the turbocharger (13), and the outlet of the waste gas heating pipeline is in communication with the atmosphere.

4. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 3, wherein The hydrogen fuel cell (19) comprises a fuel cell anode (21), a fuel cell cathode (22), a fuel cell exhaust gas outlet (23), a fuel cell air inlet (24), a fuel cell reaction water outlet (25) and a fuel cell hydrogen inlet (27), the fuel cell anode (21) and the fuel cell cathode (22) are respectively electrically connected with the positive and negative poles of the AC / DC converter (20), the fuel cell air inlet (24) is communicated with the atmosphere, the fuel cell hydrogen inlet (27) is communicated with the high-purity hydrogen outlet of the purifier (11), and the fuel cell exhaust gas outlet (23) and the fuel cell reaction water outlet (25) are both communicated with the atmosphere.

5. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 4, wherein The methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship further comprises a cooling water storage tank (29), the hydrogen fuel cell (19) further comprises a fuel cell cooling system low-temperature water inlet (26) and a fuel cell cooling system high-temperature water outlet (28), the fuel cell cooling system low-temperature water inlet (26) and the fuel cell cooling system high-temperature water outlet (28) are both arranged on the shell of the hydrogen fuel cell (19) and are communicated through the water circulation cavity inside the hydrogen fuel cell (19), the inside of the evaporator (5) is provided with a heat exchange pipeline, the inlet of the heat exchange pipeline is communicated with the fuel cell cooling system high-temperature water outlet (28), the outlet of the heat exchange pipeline is communicated with the inlet of the cooling water storage tank (29), and the outlet of the cooling water storage tank (29) is communicated with the fuel cell cooling system low-temperature water inlet (26).

6. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 5, wherein The methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship further comprises a first methanol stop valve (3) and a second methanol stop valve (4), the first methanol stop valve (3) and the second methanol stop valve (4) are respectively installed in two pipelines formed by the outlet of the submerged pump (1) and the air inlet (12) and the fuel inlet of the evaporator (5).

7. The methanol engine and fuel cell hybrid power system for an inland watercraft according to claim 6, wherein The methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship further comprises an automatic heating device (8), and the automatic heating device (8) is arranged in the reactor (7).

8. A method for operating a methanol engine and fuel cell hybrid power system for an inland waterway vessel, based on the methanol engine and fuel cell hybrid power system for an inland waterway vessel according to any one of claims 1-7, characterized in that, The active heating device (8) in the reactor (7) and the purifier (11) are separated and supply the synthesis gas of the methanol engine according to automatic adjustment of system operation load, and the operation control method comprises a low load working condition, a medium load working condition and a high load working condition: High load condition: the propulsion system load is 70%-100%, the methanol engine and hydrogen fuel cell (19) need to jointly propel, the automatic heating device (8) is started, the energy required by the methanol hydrolysis reaction is provided by the exhaust gas of the methanol engine and the automatic heating device (8), the purifier (11) provides sufficient high-purity hydrogen for the hydrogen fuel cell (19), and the remaining synthesis gas enters the methanol engine to participate in combustion, at this time, the fuel cell operates in full load condition and consumes a large amount of high-purity hydrogen, the hydrogen content of the synthesis gas entering the methanol engine is low, and the carbon dioxide content is high, which can inhibit the knock tendency of the methanol blended combustion engine by utilizing the physicochemical properties of carbon dioxide, and further improve the amount of hydrogen blended with the methanol engine; Medium load condition: the propulsion system load is 40%-70%, the methanol engine and the fuel cell need to jointly propel, the automatic heating device (8) is closed, the energy of the methanol hydrolysis reaction is provided by the exhaust gas of the methanol engine alone, at this time, the hydrogen fuel cell (19) operates in medium load condition, the purifier (11) provides sufficient high-purity hydrogen for the hydrogen fuel cell (19), and the remaining synthesis gas enters the engine, which improves the methanol combustion and the combustion characteristics of the methanol engine by utilizing the fast combustion characteristics of hydrogen, and improves the combustion thermal efficiency of the methanol engine; Low load condition: the propulsion system load is 0%-40%, which is divided into two modes of methanol engine / fuel cell joint propulsion and fuel cell single propulsion, and the control method is as follows: Methanol engine / fuel cell joint propulsion mode: start the automatic heating device (8), the energy of the methanol hydrolysis reaction is provided by the exhaust gas of the methanol engine and the automatic heating device (8), at this time, the operating load of the hydrogen fuel cell (19) is determined by the overall propulsion system, the hydrogen content of the synthesis gas entering the methanol engine is high, the low load combustion stability of the methanol engine is improved by utilizing the rapid combustion of hydrogen, and the cycle fluctuation rate during the operation of the methanol engine is reduced; Fuel cell single propulsion mode: the methanol engine is closed, the automatic heating device (8) is started, the energy of the methanol hydrolysis reaction is provided by the automatic heating device (8) alone, the purifier (11) separates hydrogen for the hydrogen fuel cell (19), and the separated carbon dioxide is discharged into the atmosphere.

9. A storage medium having stored thereon a computer program, characterized in that The computer program is executed by the processor to realize the operation control method of the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship according to claim 8.

10. A computer device, comprising: It comprises: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to realize the operation control method of the methanol hydrolysis hydrogen production methanol engine and fuel cell hybrid power system of the inland ship according to any one of claims 8.

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