A zero-nitrogen engine and its control method based on water injection to control pressure rise rate and oxygen closed-loop cycle

Abstract

The invention relates to an oxygen closed-loop circulation zero-nitrogen engine for controlling the pressure rise rate based on water spraying, and a control method thereof. Serving an engine rotationspeed signal (a1) and an engine pressure rise rate signal (a2) as the control basis, a control unit (13) controls a first valve (14), a second valve (15), a hydrogen flow controller (3), an oxygen flow controller (7) and a water spraying device (17) after the engine reaches the idle speed, recycling of oxidizing agents in tail gas of the engine and control over the combustion pressure rise rate inside a cylinder are achieved, and the utilization rate, heat efficiency and combustion stability of the oxidizing agents of the engine are effectively improved. As the clean oxidizing agents are adopted, the defect that nitrogen generates NOx in a high-temperature environment in a cylinder during air intake of a traditional hydrogen engine is overcome, and zero emission of the engine is achieved.

Description

technical field [0001] The invention provides a zero-nitrogen engine control method based on water injection to control the pressure rise rate and oxygen closed-circuit cycle, which belongs to the field of engines. Background technique [0002] Hydrogen as the fuel of the engine has good combustion characteristics: hydrogen fuel has a higher calorific value than all fossil fuels, chemical fuels and biofuels, and the low calorific value of hydrogen fuel is 2.7 times that of gasoline; its ignition energy is about 1 / of that of gasoline 10. It is easy to ignite and has good starting performance; its ignition limit is very small, which can realize lean combustion; its flame propagation speed is about 8 times that of gasoline; the autoignition temperature of hydrogen is higher than that of natural gas and gasoline, which is beneficial to increase the compression ratio , to improve the thermal efficiency of the hydrogen engine. [0003] The hydrogen engine is a new type of engine...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of high NOx emissions from hydrogen engines, and provide a zero-nitrogen engine control method based on water injection to control the pressure rise rate and oxygen closed-circuit cycle. On the basis of realizing zero emissions from hydrogen engines, the engine’s Start smoothly, adjust the pressure rise rate in the cylinder during the engine running, and realize the recovery and utilization of excess oxidant in the exhaust gas after the engine starts on the basis of ensuring the smooth combustion of the engine

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