Lean burning system, method and engine

Abstract

The invention provides a lean burning system, method and an engine. The lean burning system comprises a high pressure spraying unit, an ignition unit, an air inlet unit, an exhaust unit, a combustion chamber and a piston. The piston can reciprocate in the combustion chamber. The high pressure spraying unit, the ignition unit, the air inlet unit and the exhaust unit are arranged on the top of the combustion chamber. The high pressure spraying unit comprises a high pressure hydrogen sprayer which is an umbrella-shaped spraying oil atomizer, and the high pressure hydrogen sprayer is used for spraying umbrella-shaped hydrogen spray directly to the burning chamber. The air inlet unit comprises an air inlet door and an air inlet flue connected with each other. The exhaust unit comprises an exhaust door and an exhaust channel connected with each other. The ignition unit is used for burning a fuel in the combustion chamber. The lean burning comprises at least one lean burning system. The lean burning method is applied to the engine. The system can low emission and even zero emission of NOx and the heat efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a lean combustion system, method and engine. Background technique [0002] Developing the application of alternative fuels in traditional internal combustion engines is one of the important directions to achieve emission reduction, energy saving and promote energy security. Hydrogen is an ideal fuel for internal combustion engines due to its carbon-free, wide ignition range, high octane and calorific value. Among them, the carbon-free feature realizes zero emission of CO, HC and particulate matter (PN / PM). Wide ignition range, high octane number and calorific value are conducive to ultra-lean combustion and high geometric compression ratio, so as to achieve the purpose of high efficiency. [0003] Currently, spark ignition hydrogen internal combustion engines mainly include hydrogen port injection and in-cylinder direct injection. Compared with hydrogen port injection, in-cyli...

AI Technical Summary

Problems solved by technology

However, the current hydrogen nozzles mainly use porous injectors, which are not conducive to the uniform mixing of hydrogen and air, resulting in high original NOx emissions under high loads.

[0005] 2) Low thermal efficiency

Due to the short quenching distance of hydrogen (about 1 / 4 of that of natural gas and gasoline), the heat transfer loss of hydrogen internal combustion engines is relatively large, which limits the improvement of thermal efficiency

Images