Generating set runtime emission of HC, CO and NOx fuel vapor, harmful ingredients such as sulfuric acid mist, the air pollution, for human health, the influence of the ecological environment and economic development is more and more big, this is one of the world's biggest environmental problems.To solve this difficult problem, at present the commonly used machine purification technology and closed purification technology.For example: efi engine equipped with catalytic converter can effectively reduce the exhaust pollution.Lean combustion technology can effectively improve the gasoline engine fuel consumption, reduce harmful emissions (mainly NOx) emissions.Using EGR (exhaust gas recirculation) engine NOx emissions than the corresponding engine emissions an average 50% lower.

The limitation on the engine emissions necessary help to improve the environmental quality.Therefore, all countries in the world of engine emission restrictions.For example: the United States in 1998 on the implementation of heavy duty diesel standards NOx emissions for 4 GHP. H.Engine manufacturers association and the California air resources board (GARB) and the environmental protection agency (EPA) reached an agreement, by 2004, on the premise of the use of clean diesel fuel, its products of NOx and HC emissions of 2.5 g/HP. H, PM emissions (particles) is 0.1 g/HP. H.If you do not use clean fuel, NOx and HC emissions of the sum is 3.5 / HP. H.