Methanol pure oxygen combustion tail gas recirculation internal combustion engine

Abstract

The invention relates to a methanol pure oxygen combustion tail gas recirculation internal combustion engine. The methanol pure oxygen combustion tail gas recirculation internal combustion engine comprises a methanol supply assembly, an oxygen supply assembly, a water supply assembly, a tail gas circulation assembly, an air cylinder assembly and a control system. Compared with a traditional engine, engine power and heat efficiency are improved, high-temperature tail gas of the internal combustion engine is recycled, fuel is saved, emission is reduced, and intelligence and self-adaptability of a control system are enhanced. The method has the advantages of energy conservation, environmental protection and the like, and has epoch-making significance in national energy strategic reserve and use. The methanol pure oxygen combustion tail gas recirculation internal combustion engine can be applied to internal combustion engines for ships, vehicles and power generation.

Description

Technical Field

[0001] The invention relates to engine power technology, in particular to a methanol pure oxygen combustion tail gas recirculation internal combustion engine. Background Art

[0002] With the improvement of environmental protection awareness and the transformation of energy structure, methanol as a clean alternative fuel is receiving more and more attention. Methanol pure oxygen combustion internal combustion engine has become a research hotspot due to its high efficiency and low emission characteristics.

[0003] Methanol's ignition characteristics, anti-knock characteristics and volatility are close to those of gasoline, so the premixed ignition method of gasoline engines is usually used. Methanol is injected at low pressure, and after sufficient preparation time, a homogeneous methanol-air mixture with a fuel-to-air equivalence ratio of 1 is formed in the cylinder. The mixture is then ignited using a spark plug, and the combustion process is dominated by the propagation of a premixed turbulent flame. In the premixed ignition method, methanol fuel is mixed with air to form a homogeneous mixture, which is then ignited by a spark plug, and the combustion process is dominated by the propagation of a premixed turbulent flame. This method has a simple structure, especially a simple fuel supply system, which reduces the cost of the engine.

[0004] However, the fuel efficiency of the above-mentioned traditional methanol pure oxygen combustion engine is not high, the economy needs to be improved, and the direct exhaust of tail gas is not well utilized, so it is urgently needed for technical personnel in this field to make improvements. Summary of the invention

[0005] The object of the present invention is to provide a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, which solves the above technical problems pointed out in the prior art.

[0006] The present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, comprising: a methanol supply component, an oxygen supply component, a water supply component, an exhaust gas circulation component, a cylinder component and a control system;

[0007] Wherein, the methanol supply assembly includes a methanol fuel storage tank, a methanol pipeline and a methanol pump installed on the methanol pipeline;

[0008] The oxygen assembly includes an oxygen storage tank and an oxygen intake pipe;

[0009] The water supply assembly includes a water storage tank, a water pipeline and a water pump; the water pump is installed on the pipe of the water pipeline;

[0010] The exhaust gas circulation assembly comprises a mixer, an intake manifold, an exhaust manifold, an exhaust gas circulation pipe and an exhaust gas discharge pipe; the mixer comprises an oxygen inlet, an inlet and an outlet of a circulation pipeline; the oxygen inlet of the mixer is connected to the oxygen gas storage tank through an oxygen inlet pipe, the outlet of the mixer is connected to the intake pipeline on the cylinder assembly, and the inlet of the circulation pipeline of the mixer is connected to the exhaust gas circulation pipe; two branch pipelines at the end of the exhaust manifold are connected to the exhaust gas circulation pipe and the exhaust gas discharge pipe respectively;

[0011] The cylinder assembly includes an intake manifold, an intake valve, an exhaust valve, an exhaust manifold, and a working mechanism consisting of a piston, a connecting rod, a crankshaft and a cylinder;

[0012] The control system includes a program control system and a human-machine interface.

[0013] Preferably, as an implementable embodiment, a flow sensor, a pressure sensor, and a flow control valve are also provided on the methanol pipeline.

[0014] Preferably, as an implementable embodiment, a flow sensor, a pressure sensor, and a flow control valve are arranged on the water pipeline.

[0015] Preferably, as an implementable solution, a flow sensor, a pressure sensor, a flow control valve, a fine-tuning control valve and a cut-off valve are provided on the oxygen inlet pipe.

[0016] Preferably, as an implementable solution, a temperature sensor, a pressure sensor and an exhaust gas composition sensor are provided on the exhaust manifold; a pressure sensor, a temperature sensor and an oxygen composition sensor are provided on the intake manifold.

[0017] Preferably, as an implementable embodiment, a flow sensor is provided on the exhaust gas circulation pipe; and an exhaust gas emission baffle and an exhaust gas exhaust hole are provided on the exhaust gas emission pipe.

[0018] Preferably, as an implementable embodiment, methanol is used as fuel and pure oxygen as a combustion aid; the cylinder is used to generate high-temperature carbon dioxide and water vapor after the methanol and the pure oxygen are mixed in the cylinder and burned, and a part of the high-temperature carbon dioxide and water vapor is output as the circulating gas medium into the exhaust gas circulation pipe and then enters the mixer to mix with oxygen to reduce the pure oxygen concentration and then re-enter the cylinder of the engine.

[0019] Preferably, as an implementable embodiment, the water used inside the water storage tank includes tail gas-liquid separation water, pure water, and distilled water.

[0020] Preferably, as an implementable embodiment, the control system adjusts the oxygen supply according to the methanol-water solution obtained by the data signal of the methanol-water solution flow sensor and according to a preset methanol-water combustion ratio mapping relationship table.

[0021] Preferably, as an implementable embodiment; the control system obtains the exhaust gas temperature according to the exhaust branch pipe temperature sensor data signal, and adjusts the supply of methanol water and oxygen according to the preset mapping relationship table of exhaust gas temperature and methanol water and oxygen supply.

[0022] The embodiment of the present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, which has the following technical effects:

[0023] The present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, comprising an energy input system; wherein a methanol supply component transports fuel from a storage tank to the system through a methanol pump, an oxygen component provides pure oxygen as a combustion aid, and a water supply component provides water to regulate the combustion process;

[0024] In the mixer, fresh pure oxygen is fully mixed with the circulating exhaust gas, and the mixed gas enters the cylinder through the intake manifold; the methanol and oxygen-containing mixed gas in the cylinder burn and do work; an exhaust gas treatment component is used, in which the exhaust gas (mainly CO2 and water vapor) after combustion is discharged through the exhaust manifold, and then a part of the exhaust gas returns to the mixer through the circulation pipe, while ensuring that the remaining exhaust gas is discharged from the system through the exhaust pipe; the present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, which realizes efficient, clean and reliable power output through the two core technologies of pure oxygen combustion and exhaust gas circulation, and represents the innovative development direction of internal combustion engine technology.

[0025] In specific applications, it uses methanol as fuel and combines it with pure oxygen to assist combustion, which improves the combustion efficiency of the engine. At the same time, precise fuel control is achieved through sensors and control valves on the methanol pipeline. It uses a matching tail gas circulation system. In the specific implementation process, part of the tail gas (CO2 and water vapor) is recycled to reduce emissions. The circulating gas is mixed with pure oxygen to adjust the oxygen content of the intake air and control the combustion temperature. The tail gas circulation achieved by the above technical solution can improve thermal efficiency and reduce energy loss. The present invention provides a methanol pure oxygen combustion tail gas recirculation internal combustion engine, which uses clean fuel methanol to reduce harmful gas emissions, and tail gas circulation reduces emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine;

[0027] Figure 2 The schematic diagram of the control system in a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine;

[0028] Label:

[0029] Methanol supply assembly 1; methanol fuel storage tank 11; methanol pipeline 12; methanol pump 13; oxygen supply assembly 2; oxygen storage tank 21; oxygen intake pipe 22; water supply assembly 3; water storage tank 31; water pipeline 32; water pump 33; water level sensor 34; steam trap 35; exhaust gas circulation assembly 4; mixer 41; intake manifold 42; exhaust manifold 43; exhaust gas circulation pipe 44; exhaust gas discharge pipe 45; exhaust gas discharge baffle 451; exhaust gas exhaust hole 452; cylinder assembly 5; working mechanism 51; control system 6; program control system 61; human-machine interface 62; flow sensor 71; pressure sensor 72; flow control valve 73; fine-tuning control valve 74; cut-off valve 75; temperature sensor 76; exhaust gas composition sensor 77; oxygen composition sensor 78. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] To facilitate understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings.

[0032] Embodiment 1

[0033] See also Figure 1 The present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, comprising: a methanol supply component 1, an oxygen supply component 2, a water supply component 3, an exhaust gas circulation component 4, a cylinder component 5 and a control system 6;

[0034] The methanol supply assembly 1 includes a methanol fuel storage tank 11, a methanol pipeline 12, and a methanol pump 13 installed on the methanol pipeline 12;

[0035] The oxygen assembly 2 includes an oxygen storage tank 21 and an oxygen intake pipe 22;

[0036] The water supply assembly 3 includes a water tank 31, a water pipeline 32 and a water pump 33; the water pump 33 is installed on the pipe of the water pipeline 32; a water level sensor 34 and a drain valve 35 arranged on the drainage pipe (the drainage pipe is installed on the water tank 31) are also arranged on the inner wall of the water tank 31;

[0037] The exhaust gas circulation assembly 4 includes a mixer 41, an intake manifold 42, an exhaust manifold 43, an exhaust gas circulation pipe 44 and an exhaust gas discharge pipe 45; the mixer 41 includes an oxygen inlet, a circulation pipeline inlet and an outlet; the oxygen inlet of the mixer 41 is connected to the oxygen storage tank 21 through the oxygen inlet pipe 22, the outlet of the mixer 41 is connected to the intake pipeline 51 on the cylinder assembly 5, and the circulation pipeline inlet of the mixer 41 is connected to the exhaust gas circulation pipe 44; the two branch pipelines at the end of the exhaust manifold 43 are respectively connected to the exhaust gas circulation pipe 44 and the exhaust gas discharge pipe 45;

[0038] The cylinder assembly 5 includes an intake manifold, an intake valve, an exhaust valve, an exhaust manifold, and a working mechanism 51 composed of a piston, a connecting rod, a crankshaft, and a cylinder; wherein the intake valve is installed on the intake manifold, and the exhaust valve is installed on the exhaust manifold; the intake manifold is the intake manifold 42, and the exhaust manifold is the exhaust manifold 43;

[0039] The control system 6 includes a program control system 61 and a human-machine interface 62; wherein, the two end pipe openings of the oxygen inlet pipe are respectively connected to the oxygen storage tank and the inlet end of the mixer; the outlet end of the mixer is connected to the inlet end of the intake manifold; and the exhaust manifold is connected in sequence with an exhaust gas circulation pipe and an exhaust gas exhaust pipe.

[0040] The present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, comprising: a methanol supply component, an oxygen supply component, a water supply component, an exhaust gas circulation component, a cylinder component and a control system;

[0041] It uses methanol as fuel and combines pure oxygen to assist combustion, which improves the combustion efficiency of the engine. At the same time, precise fuel control is achieved through sensors and control valves on the methanol pipeline. It uses a matching tail gas circulation system. In the specific implementation process, part of the tail gas (CO2 and water vapor) is recycled to reduce emissions. The circulating gas is mixed with pure oxygen to adjust the oxygen content of the intake air and control the combustion temperature. The tail gas circulation achieved by the above technical solution can improve thermal efficiency and reduce energy loss. The present invention provides a methanol pure oxygen combustion tail gas recirculation internal combustion engine, which uses clean fuel methanol to reduce harmful gas emissions, and tail gas circulation reduces emissions.

[0042] The present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, comprising an energy input system; wherein a methanol supply component transports fuel from a storage tank to the system through a methanol pump, an oxygen component provides pure oxygen as a combustion aid, and a water supply component provides water to regulate the combustion process;

[0043] In the mixer, fresh pure oxygen is fully mixed with the circulating exhaust gas, and the mixed gas enters the cylinder through the intake manifold; the methanol and oxygen-containing mixed gas in the cylinder burn and do work; an exhaust gas treatment component is used, in which the exhaust gas (mainly CO2 and water vapor) after combustion is discharged through the exhaust manifold, and then a part of the exhaust gas returns to the mixer through the circulation pipe, while ensuring that the remaining exhaust gas is discharged from the system through the exhaust pipe; the present invention provides a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, which realizes efficient, clean and reliable power output through the two core technologies of pure oxygen combustion and exhaust gas circulation, and represents the innovative development direction of internal combustion engine technology.

[0044] Preferably, as an implementable solution, the methanol pipeline 12 is also provided with a flow sensor 71 (ie, a methanol flow sensor), a pressure sensor 72 , and a flow control valve 73 .

[0045] Preferably, as an implementable solution, a flow sensor 71 , a pressure sensor 72 , and a flow control valve 73 are provided on the water pipeline 32 .

[0046] Preferably, as an implementable solution, the oxygen inlet pipe 22 is provided with a flow sensor 71 (ie, an oxygen flow sensor), a pressure sensor 72, a flow control valve 73, a fine-tuning control valve 74 and a cut-off valve 75.

[0047] Preferably, as an implementable solution, the exhaust manifold 43 is provided with a temperature sensor 76 , a pressure sensor 72 and an exhaust gas composition sensor 77 ; the intake manifold 42 is provided with a pressure sensor 72 , a temperature sensor 76 and an oxygen composition sensor 78 .

[0048] In the above technical solution, the methanol pure oxygen combustion exhaust gas recirculation internal combustion engine adopted by the present invention has better safety. Its multiple sensor monitoring ensures safe operation, and the oxygen pipeline is provided with multiple protections such as a cut-off valve.

[0049] Preferably, as an implementable embodiment, a flow sensor 71 (i.e., an exhaust gas flow sensor) is provided on the exhaust gas circulation pipe 44 ; and an exhaust gas emission baffle 451 and an exhaust gas exhaust hole 452 are provided on the exhaust gas emission pipe 45 .

[0050] Preferably, as an implementable embodiment, methanol is used as fuel and pure oxygen is used as a combustion aid. The cylinder is used to burn the methanol and the pure oxygen in the cylinder to generate high-temperature carbon dioxide and water vapor, and a part of the high-temperature carbon dioxide and water vapor is output as the circulating gas medium to enter the exhaust gas circulation pipe 44 and then enter the mixer to mix with oxygen to reduce the pure oxygen concentration and then re-enter the cylinder of the engine.

[0051] In the above technical solution, the working efficiency of the methanol pure oxygen combustion exhaust gas recirculation internal combustion engine adopted by the present invention is significantly improved, wherein pure oxygen assists combustion to improve combustion efficiency, while the intelligent control system ensures the optimal operating state.

[0052] Preferably, as an implementable embodiment, the water used in the water storage tank 31 includes tail gas-liquid separation water, pure water, and distilled water.

[0053] Preferably, as an implementable embodiment, the control system adjusts the oxygen supply according to the methanol-water solution obtained by the data signal of the methanol-water solution flow sensor and according to a preset methanol-water combustion ratio mapping relationship table.

[0054] Preferably, as an implementable embodiment, the control system adjusts the supply of methanol water and oxygen according to the exhaust gas temperature obtained according to the exhaust branch pipe temperature sensor data signal and according to the preset mapping relationship table between the exhaust gas temperature and the supply of methanol water and oxygen.

[0055] In the above technical scheme, the control system of the methanol pure oxygen combustion exhaust gas recirculation internal combustion engine adopted by the present invention has automation and autonomy effects: first, real-time monitoring of operating parameters through multiple sensors; second, intelligent adjustment based on preset ratio relationship; third, automatic control of the ratio of methanol, water and oxygen to optimize the combustion effect.

[0056] The methanol pure oxygen combustion exhaust gas recirculation internal combustion engine can be used in various fields such as vehicle engines, marine engines, generators, etc. The methanol pure oxygen combustion exhaust gas recirculation internal combustion engine improves the engine power and thermal efficiency through the technology of mixed combustion of methanol and pure oxygen with the engine high temperature exhaust gas, realizes the recycling of the high temperature exhaust gas of the internal combustion engine, saves fuel, reduces emissions, has the advantages of energy saving and environmental protection, and has epoch-making significance in the national energy strategic reserve and use.

[0057] The method for using the methanol pure oxygen combustion exhaust gas recirculation internal combustion engine of the present invention comprises the following steps:

[0058] 1) Start the engine through the ignition switch, and power the various components of the methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, press the start button, and when the first cold engine start, the control system first opens the methanol control valve and appropriately opens the oxygen control valve.

[0059] The methanol flow rate is controlled by a methanol flow control valve and a methanol flow sensor, and the methanol load is adjusted by the flow control valve SV value set by the control system.

[0060] The oxygen flow rate is controlled by an oxygen flow control valve and an oxygen flow sensor, and the oxygen load is adjusted by the flow control valve SV value set by the control system.

[0061] In the automatic control mode, the control system will compare the given value of each flow sensor with the actual feedback value, and then automatically calculate the output signal to the corresponding control valve after the PID module automatically calculates the output signal to control the opening of the control valve, so that the actual value quickly approaches the set value, so as to increase the oxygen concentration and ensure smooth ignition.

[0062] The control system sprays methanol and oxygen into the engine through the control valve according to the feedback value of the flow sensor and the data signal of the flow sensor. After the ignition is successful, the combustion of methanol pushes the piston and then drives the connecting rod and the crankshaft to reciprocate and work. The exhaust gas formed by the combustion enters the exhaust gas circulation pipe through the exhaust manifold, and part of the exhaust gas enters the intake manifold to wait for mixing with oxygen. The control system adjusts the oxygen flow control valve to control the oxygen amount according to the feedback value of the data signal of the oxygen flow sensor and the exhaust gas component sensor, according to the oxygen content in the exhaust gas components, and then automatically calculates through the PID module. Excess exhaust gas is discharged into the atmosphere from the exhaust gas exhaust hole on the exhaust manifold bypass. When the exhaust pipeline pressure rises to the safety setting value, the exhaust gas discharge damper automatically opens to ensure the stability of the system pressure.

[0063] 2) After the above step 1), the control system automatically controls the ratio of oxygen to circulating exhaust gas by controlling the oxygen control valve according to the set ratio according to the feedback value of the data signal of the oxygen flow sensor, circulating exhaust gas flow sensor and exhaust gas composition sensor of the operating condition of the cylinder assembly. The oxygen and circulating exhaust gas are completely mixed in the mixer and then enter the cylinder through the intake manifold in sequence. 3) After the above step 2), the control system controls the water pump to pass water into the methanol pipeline and mix it with methanol and then spray it into the cylinder according to the feedback value of the data signal of the flow sensor of the operating condition of the cylinder assembly.

[0064] The water flow control loop consists of a water pump, a water flow sensor and a water flow control valve. The water load is adjusted by the flow control valve SV value set by the control system.

[0065] In the automatic control mode, the control system will compare the given value of the flow sensor with the actual feedback value, and then automatically calculate the output signal to the corresponding control valve after the PID module automatically calculates and controls the opening of the control valve.

[0066] 4) After the above step 3), the exhaust gas in the engine cylinder is continuously circulated according to steps 1), 2), and 3), and the exhaust gas of methanol pure oxygen combustion is recirculated in the internal combustion engine to continuously adjust the methanol injection amount to achieve high torque when the low speed load is large and low torque when the high speed load is small during operation. The control system monitors the pressure value of the circulating exhaust gas in real time according to the feedback value of the data signal of the mixer outlet pressure sensor under the operating condition of the cylinder assembly. When the pressure value is lower than the set value, the control system automatically calculates and adjusts the opening of the exhaust control valve through the PID module, and automatically increases the circulating exhaust gas volume to ensure the stability of the combustion system.

[0067] 5) The exhaust gas recirculation internal combustion engine with methanol and pure oxygen combustion is provided with an exhaust gas discharge hole in the exhaust gas discharge pipeline. During the operation of the engine and after stopping, the exhaust gas generated by the combustion of gaseous methanol and the condensed water in the pipeline are automatically discharged through the exhaust gas discharge hole.

[0068] 6) The methanol pure oxygen combustion exhaust gas recirculation internal combustion engine is equipped with an emergency shut-off valve on the methanol pipeline. Under emergency conditions, the control system will promptly close the methanol shut-off valve to cut off the methanol supply to ensure the safety of the engine.

[0069] The methanol pure oxygen combustion exhaust gas recirculation internal combustion engine is equipped with an emergency shut-off valve on the oxygen pipeline. Under emergency conditions, the control system will promptly close the oxygen shut-off valve to cut off the oxygen supply to ensure the safety of the engine.

[0070] 7) During the operation of the methanol-pure-oxygen combustion exhaust gas recirculation internal combustion engine, the control system sends out an alarm signal when the oxygen and methanol pressures are lower than the set values ​​through the pressure sensors installed on the oxygen and methanol pipelines, reminding to add oxygen and methanol; by installing a drain valve and a water level sensor on the water storage tank, when the water level in the water storage tank is lower than the set value, an alarm is issued in time to notify water replenishment; by installing an emergency shut-off valve, an inertia switch and a low-pressure interlock alarm device on the methanol pipeline and the oxygen pipeline, and a low-temperature interlock alarm device on the exhaust pipeline, the control system will cut off the methanol and oxygen supply in time under emergency conditions such as when the oxygen and methanol pressures are lower than the set value, collision or engine fire occurs, thereby ensuring the safe operation of the engine.

[0071] In the above method, the operating conditions of the cylinder assembly include acceleration conditions, deceleration conditions, idling conditions, lean mixture conditions, rich mixture conditions and air conditions.

[0072] Research has found that the above-mentioned methanol water generates high-pressure water vapor after combustion. The volume of water when it turns into steam expands by more than 1,000 times (the combustion volume of gasoline and air at the same temperature only increases by 60 times). The expansion of water vapor pushes the piston to do work, and the pressure in the cylinder increases. The power is much higher than that of traditional internal combustion engines, and stable working high pressure can be achieved without turbocharging.

[0073] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0074] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0075] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A methanol pure oxygen combustion exhaust gas recirculation internal combustion engine, characterized in that: It includes a methanol supply component, an oxygen supply component, a water supply component, an exhaust gas circulation component, a cylinder component and a control system; Wherein, the methanol supply assembly includes a methanol fuel storage tank, a methanol pipeline and a methanol pump installed on the methanol pipeline; The oxygen assembly includes an oxygen storage tank and an oxygen intake pipe; The water supply assembly includes a water storage tank, a water pipeline and a water pump; the water pump is installed on the pipe of the water pipeline; The exhaust gas circulation assembly comprises a mixer, an intake manifold, an exhaust manifold, an exhaust gas circulation pipe and an exhaust gas discharge pipe; the mixer comprises an oxygen inlet, an inlet and an outlet of a circulation pipeline; the oxygen inlet of the mixer is connected to the oxygen gas storage tank through an oxygen inlet pipe, the outlet of the mixer is connected to the intake pipeline on the cylinder assembly, and the inlet of the circulation pipeline of the mixer is connected to the exhaust gas circulation pipe; two branch pipelines at the end of the exhaust manifold are connected to the exhaust gas circulation pipe and the exhaust gas discharge pipe respectively; The cylinder assembly includes an intake manifold, an intake valve, an exhaust valve, an exhaust manifold, and a working mechanism consisting of a piston, a connecting rod, a crankshaft and a cylinder; The control system includes a program control system and a human-machine interface.

2. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The methanol pipeline is also provided with a flow sensor, a pressure sensor and a flow control valve.

3. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: A flow sensor, a pressure sensor and a flow control valve are arranged on the water pipeline.

4. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The oxygen intake pipe is provided with a flow sensor, a pressure sensor, a flow control valve, a fine-tuning control valve and a cut-off valve.

5. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The exhaust manifold is provided with a temperature sensor, a pressure sensor and an exhaust gas composition sensor; as a further optimization of the above technical solution, the intake manifold is provided with a pressure sensor, a temperature sensor and an oxygen composition sensor.

6. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The exhaust gas circulation pipe is provided with a flow sensor; the exhaust gas emission pipe is provided with an exhaust gas emission baffle and an exhaust gas exhaust hole.

7. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: in, Methanol is used as fuel and pure oxygen is used as a combustion aid; the cylinder is used to generate high-temperature carbon dioxide and water vapor after the methanol and the pure oxygen are mixed and burned in the cylinder, and a part of the high-temperature carbon dioxide and water vapor is output as a circulating gas medium to enter the exhaust gas circulation pipe and then enter the mixer to mix with oxygen to reduce the pure oxygen concentration and then re-enter the cylinder of the engine.

8. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The water used inside the water storage tank includes tail gas-liquid separation water, pure water, and distilled water.

9. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The control system adjusts the oxygen supply according to the methanol-water solution obtained by the data signal of the methanol-water solution flow sensor and according to a preset methanol-water combustion ratio mapping relationship table.

10. The combustion optimization control method of a methanol pure oxygen combustion exhaust gas recirculation internal combustion engine according to claim 1, characterized in that: The control system adjusts the supply of methanol water and oxygen according to the exhaust gas temperature obtained according to the exhaust branch pipe temperature sensor data signal and according to the preset mapping relationship table between the exhaust gas temperature and the supply of methanol water and oxygen.

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