Device and method for reducing exhaust gas emission of engine

Abstract

The invention discloses a device and a method for reducing exhaust gas emission of an engine. The device mainly comprises a hydrogen storing device, an intake hydrogen-mixing sprayer, an engine, an exhaust hydrogen-mixing sprayer, an exhaust temperature sensor, a catalytic reactor and an electronic control unit. The electronic control unit is used to collect signals of speed and load and exhaust temperature of the engine; hydrogen is sprayed into intake air of the engine in order to achieve hydrogen-mixing combustion, so that the contents of HC and CO in exhaust gas are reduced, but the emission of NOx is increased. Therefore, when the hydrogen is mixed in the exhaust gas of the engine, the good reducibility of the hydrogen can reduce the content of the NOx in the exhaust gas by the action of a catalyst at a certain temperature. Finally, the combustion in a cylinder of the engine is improved; and the emission of the HC, CO and NOx of vehicles is reduced, thereby achieving the purposes of energy conservation and emission reduction.

Description

technical field [0001] The invention provides a device and method for reducing engine harmful emissions. The electronic control unit mainly collects the engine speed, load and exhaust temperature signals, and injects hydrogen into the intake air of the engine to realize hydrogen-mixed combustion, thereby reducing HC and exhaust gases in the exhaust gas. The purpose of CO, however, the emission of NOx has increased. Therefore, hydrogen is mixed in the exhaust gas of the engine, and the NOx in the exhaust gas can be reduced by using the good reducibility of hydrogen under the conditions of catalyst and certain temperature. Finally, the combustion in the cylinder of the engine is improved, and the emission of HC, CO and NOx of the vehicle is reduced, thereby achieving the purpose of energy saving and emission reduction. Background technique [0002] With the rapid development of my country's automobile industry, the continuous consumption of fossil resources and the increasing...

AI Technical Summary

Problems solved by technology

At present, NOx emissions in engine exhaust can be reduced by urea selective catalytic reduction (SCR) technology, but vehicles must add urea regularly, and the control system is complex and costly. In low temperature environments, urea will crystallize and cannot be injected into the reactor. Excessive spraying of urea is directly discharged into the atmosphere to form a new pollution problem

Images