Motor vehicle tail gas purification device and working method thereof

Abstract

The invention relates to a motor vehicle tail gas purification device and a working method thereof. The motor vehicle tail gas purification device comprises a plurality of treatment units which communicate linearly, each treatment unit is provided with a purification cavity, a tail gas contraction gas inlet hole and a tail gas outlet expansion hole, the front treatment unit and the rear treatmentunit communicate with each other through the tail gas outlet expansion holes and the tail gas contraction gas inlet holes, and the tail end treatment unit is connected with a contraction exhaust hoodand an exhaust straight pipe; Venturi units distributed with Venturi holes are arranged in the purification chamber of each treatment unit; and at least one air inlet hole communicating with the outside is formed in the front end of the purification cavity in each treatment unit, and the front end of the purification cavity of the treatment unit at the head end communicates with the inner cavity of the exhaust hood through an external circulating pipe. The working method comprises the steps that tail gas passes through the tail gas contraction gas inlet holes and the Venturi holes, certain vacuum is formed in the purification cavities, air enters the purification cavities to react with the tail gas, most tail gas of the tail end treatment unit flows back to the head end treatment unit along the circulating pipe, repeated purification treatment of the tail gas is achieved, efficiency is high, and the effect is good.

Description

technical field [0001] The invention relates to the field of motor vehicle tail gas purification, and relates to a motor vehicle tail gas purification device and a working method thereof. Background technique [0002] The most common method of existing automobile exhaust treatment is to use a three-way catalytic converter. The principle is that when the high-temperature motor vehicle exhaust passes through the purification device, the purification agent in the three-way catalytic converter will enhance the concentration of the three gases CO, HC and NOx. Activity, prompting it to carry out a certain oxidation-reduction chemical reaction, in which CO is oxidized at high temperature to become colorless, non-toxic carbon dioxide gas; HC compound is oxidized to water (H 2 O) and carbon dioxide; NOx is reduced to nitrogen and oxygen. Three kinds of harmful gases become harmless gases, so that the automobile exhaust can be purified. The main disadvantage of the above purificatio...

Images