Ammonia gas generating device for diesel vehicle filter

Abstract

The invention relates to an automobile filter, and provides an ammonia gas generating device for a diesel vehicle filter. An ammonia gas nozzle is arranged at one end of a cylindrical shell, a urea heating cavity is arranged outside the other end of the cylindrical shell, and a sleeve is arranged outside the urea heating cavity; a cavity communicated with the urea heating cavity is formed between the sleeve and the shell, a urea inlet is formed in the outer side of the sleeve, connected with a metering device and communicated with the internal cavity and the urea heating cavity, and a vehicle tail gas inlet is formed in the outer side of the sleeve and tangent to the section of the sleeve. According to the ammonia gas generating device for the diesel vehicle filter, the design of all inlets is reasonable, vehicle tail gas and urea can be evenly mixed with ammonia gas in an exhaust pipe through different jetting directions, the ammonia gas is directly jet into an exhaust manifold, and the ammonia gas generating device can be used for a closed DeNOx system; the nitrate removing efficiency is high, and space for hydrolysis and evaporation is not needed; the ammonia gas generating device can be applied to a closed nitrate removing system, sediments in a catalyst and the exhaust pipe are avoided, the probability of system failures caused by sedimentation is lowered, and the blank of ammonia gas generating devices for diesel vehicle tail gas purifying devices is filled up.

Description

technical field [0001] The patent of the present invention relates to the technical field of automobile filters, in particular to an ammonia generating device for diesel automobile filters. Background technique [0002] With the increase in the use of automobiles in our country, how to control the pollutants in the exhaust gas has become a hot spot. Among them, Selective Catalytic Reduction (SCR for short), as an important means to effectively control nitrogen oxide emissions, is widely used because of its high denitrification efficiency and mature process. SCR technology is a technology that uses a reducing agent (liquid ammonia, etc.) to react with nitrogen oxides in flue gas to generate nitrogen and water under the action of a catalyst, thereby removing nitrogen oxides. At present, most of the ammonia generators for automobile exhaust filters in the domestic market are directly sprayed with ammonia water, which cannot effectively improve the nitrogen oxides in the exhaus...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor mixing effect and easy clogging of direct injection generators, the present invention provides an ammonia generator for diesel vehicle filters with uniform mixing, high catalytic efficiency and closed-loop denitrification

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