A lean burn system, method and engine

Abstract

The present invention provides a lean burn system, method and engine, the lean burn system includes a high pressure injection unit, an ignition unit, an intake unit, an exhaust unit, a combustion chamber and a piston; the piston can reciprocate in the combustion chamber; the high pressure injection unit , ignition unit, air intake unit and exhaust unit are all arranged on the top of the combustion chamber; the high pressure injection unit includes a high pressure hydrogen injector, the high pressure hydrogen injector is an umbrella spray fuel injector, and the high pressure hydrogen injector is used for direct injection to the combustion chamber The umbrella-shaped hydrogen spray; the intake unit includes a connected intake valve and an intake port; the exhaust unit includes a connected exhaust valve and an exhaust port; the ignition unit is used to burn the fuel in the combustion chamber. The lean engine includes at least one lean burn system as described above, and the lean burn method is applied to the engine described above. The present invention can realize low emission or even zero emission of NOx, and improve thermal efficiency.

Description

technical field [0001] The present invention relates to the technical field of engines, in particular to a lean burn system, method and engine. Background technique [0002] The development of the application of alternative fuels in traditional internal combustion engines is one of the important directions to achieve emission reduction, energy conservation and promotion of energy security. Hydrogen is an ideal fuel for internal combustion engines due to its carbon-free, wide ignition range, high octane number and calorific value. Among them, the carbon-free feature achieves zero emissions of CO, HC and particulate matter (PN / PM). Wide ignition range, high octane and calorific value facilitate ultra-lean burn and high geometric compression ratios for high efficiency. [0003] At present, the spark-ignited hydrogen internal combustion engine mainly includes hydrogen port injection and in-cylinder direct injection. Compared with hydrogen port injection, in-cylinder direct in...

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