Plasma system of natural gas engine

Abstract

The invention discloses a plasma system of a natural gas engine. The plasma system of the natural gas engine comprises a gas inlet pipe, an exhaust pipe, an EGR pipe, a plasma generator and a catalyst. One end of the EGR pipe communicates with the exhaust pipe, and the other end of the EGR pipe communicates with the gas inlet pipe. The EGR pipe is provided with an EGR adjusting valve connected with an ECU in a controlled manner. The plasma generator is arranged on the exhaust pipe and located on the upstream side of the communication position between the EGR pipe and the exhaust pipe. The catalyst is arranged on the exhaust pipe and located on the downstream side of the communication position between the EGR pipe and the exhaust pipe. The plasma system of the natural gas engine can shorten the ignition delay time of the engine, increase the flame propagation velocity in a cylinder and widen the knock border, so that the combustion efficiency is improved, and HC discharge is lowered. Meanwhile, the ignition energy of an ignition system can also be lowered, and the reliability of the ignition system is improved. Besides, the plasma system of the natural gas engine can improve the conversion efficiency of the three pollutants of CH4, NOx and CO.

Description

technical field [0001] The invention relates to the field of natural gas engines, in particular to a plasma system for natural gas engines. Background technique [0002] As national emission regulations become more and more stringent, the requirements for engine emission control are also getting higher and higher. In order to make natural gas engines meet Euro VI and above emission levels, the combination of equivalent combustion, EGR (exhaust gas recirculation system) and TWC (three-way catalytic converter) is considered to be the mainstream in all emission control technology routes at the present stage technology. In this technology, in order to reduce the NOx (nitrogen oxides) in the exhaust as much as possible, part of the exhaust gas is introduced into the intake system, mixed with air and gas, and then enters the cylinder for combustion. Due to the increase of inert gases such as carbon dioxide in the mixed gas, the The combustion speed in the cylinder is slowed down...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a plasma system of a natural gas engine with a simple and reasonable structure. The plasma system of the natural gas engine can improve the problem that the combustion stability decreases after exhaust gas is introduced into the engine cylinder, shorten the ignition delay of the engine, and accelerate The flame propagation speed in the cylinder widens the knock boundary, thereby improving combustion efficiency and reducing HC emissions. At the same time, it can also reduce the ignition energy of the ignition system and improve the reliability of the ignition system

Images