Catalytic converter capable of effectively removing exhaust pollution at vehicle starting stage

Abstract

Within certain time of vehicle starting, because a conventional vehicle catalytic converter is not heated to an active temperature by exhaust gas, the exhaust gas at the stage cannot be purified and thus a great of poisonous and harmful pollutants such as NOx and a hydrocarbon compound HC are emitted. The invention discloses a vehicle exhaust catalytic purifier capable of removing exhaust emissionat the vehicle starting stage to a greatest extent, and the vehicle exhaust catalytic purifier comprises a catalytic device body and a catalyst preheating system. A carrier of the catalytic device isfirstly coated with an electric-heating coating which adopts excellent electric-heating materials such as carbon fibers; and a catalyst coating coats the electric-heating coating. By inducting and utilizing the electric-heating layer in a remote-control mode, the catalyst coating on the outer surface is quickly pre-heated to a temperature within the active temperature range before an internal combustion engine is started, and a vehicle internal combustion engine is allowed to start, and heating, on the catalyst, by external energy is stopped. Combustion exhaust at the stage is subjected to effective catalytic reaction, so that pollutants such as NOx therein are removed.

Description

technical field [0001] The invention relates to the technical field of tail gas treatment for effectively removing tail gas pollution during vehicle start-up, in particular to a vehicle tail gas catalytic converter that can be preheated, and is suitable for various vehicles and mechanical devices powered by internal combustion engines. Background technique [0002] A catalytic converter is a catalytic device that converts harmful gases such as NOx, CO, and hydrocarbons HC from vehicle exhaust into harmless nitrogen, water, and carbon dioxide through oxidation and reduction. The three-way catalyst should react at the lowest temperature of 250 degrees Celsius. When the temperature is too low, the conversion efficiency will drop sharply, and the best working temperature for the activity of the catalyst is about 400 degrees Celsius to 800 degrees Celsius. At present, the traditional catalytic converter is generally installed about 1.2 m away from the engine outlet. In the first ...

AI Technical Summary

Problems solved by technology

At present, the traditional catalytic converter is generally installed about 1.2 m away from the engine outlet. In the first 200 s when the engine starts to work, the bed temperature of the catalyst is lower than 250 °C, which does not reach the light-off temperature of the catalyst. Pollutants discharged during start-up play a purifying role, especially in northern cold regions

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