Gasoline engine tail gas treatment device with hydrocarbon catching function

Abstract

The invention belongs to the field of the discharge pollution control of gasoline engines, and particularly relates to a device capable of reducing the discharge of hydrocarbons of the gasoline engine in the cold boot stage. During cold boot and warming, a semi-circular hydrocarbon catcher 8 is positioned the operating position to catch the hydrocarbons; after a catalyst on a semi-circular triple effect catalytic converter 10 is ignited, a driving motor 19 drives an output shaft to rotate a partition plate 9 by transmission gears 11 and 12; the semi-circular triple effect catalytic converter 10 is switched to the operating position to perform catalytic oxidation on subsequent tail gas; an electric control unit 6 controls the opening of a solenoid valve 13, so that the released hydrocarbons 14 enters an air inlet pipe 1 from a connection pipe 16 by utilizing pressure difference on two sides and vacuum degree in the rear of a throttle valve, and then enters an air cylinder to be burned to discharge the low hydrocarbons during the cold boot and the warming.

Description

technical field [0001] The invention belongs to the field of gasoline engine emission pollution control, in particular to a device capable of reducing hydrocarbon emission in the cold start stage of the gasoline engine. Background technique [0002] In the cold start stage of the gasoline engine, due to the low start speed, low initial combustion temperature, air leakage and heat loss, the compression temperature and compression pressure during cold start are much lower than those in normal operation, resulting in unstable combustion , or even a fire, causing severe hydrocarbon emissions. At the same time, for the traditional three-way catalytic converter, the light-off temperature of the catalyst is usually 250°C to 300°C, and the catalytic converter can reach this temperature in about 2 minutes after the gasoline engine is started, and the exhaust gas discharged at this time has already It accounts for about 80% of the total circulation and is mainly dominated by hydrocar...

AI Technical Summary

Problems solved by technology

[0003] In order to enable the catalyst system to reach its working temperature in a very short time after cold start and reduce the emission of hydrocarbons in the cold start stage, a series of complex catalyst heating measures have been proposed, such as electric heating carrier, secondary air injection system etc., but the two have their own disadvantages: the electric heating carrier needs to consume a lot of energy of the battery, which will affect the battery life and may make it more difficult to start; the thermochemical reaction of the secondary air injection in the exhaust system is a very complicated one. In the process, many key parameters need to be understood and optimized, it is difficult to control, and the cost will increase a lot

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