Selective catalytic reduction converter of diesel engine for automobile

Abstract

The invention relates to a selective catalytic reduction converter of a diesel engine for an automobile. The converter comprises a urea controller, an injection device, an atomizer, a mixer, a reformer, a tail gas inlet and a mixed gas outlet, wherein the injection device is connected with the urea controller and the atomizer; the mixer is arranged at the lower part of the atomizer; the tail gas inlet and the reformer are respectively arranged at the two ends of the mixer; and the mixed gas outlet is formed at the front end of the reformer. Compared with the prior art, the selective catalyticreduction converter provided by the invention has the advantages of simple and compact structure, uniform ammonia concentration distribution, ammonia leakage reduction, high NOX conversion rate, small pressure loss and the like.

Description

technical field [0001] The invention relates to a catalytic converter, in particular to a selective reduction catalytic converter for a vehicle diesel engine. Background technique [0002] In the situation of continuous growth of automobiles and energy shortage, dieselization of motor vehicles has become a development trend, and the oxygen-enriched conditions of diesel engines will bring higher NO X emissions, thus developing and improving NO X control technology to reduce NO X Emissions are of great significance to protect the environment. Selective catalytic reduction (SCR) technology of urea aqueous solution can effectively reduce diesel engine nitrogen oxides (NO X ) emission, which is the most realistic emission reduction technology, has become a research hotspot. With the implementation of European regulations, the technology has been applied on European heavy-duty commercial diesel vehicles. Due to the variable driving conditions of diesel vehicles and the large ...

AI Technical Summary

Problems solved by technology

At present, the main problems are 1. Ammonia is a poisonous gas, and the unreacted ammonia in the SCR system will cause secondary pollution if it is discharged into the atmosphere; 2. The flow and uneven concentration distribution at the entrance of the SCR system will greatly affect the entire system. NO X Conversion efficiency and NH 3 Leakage; 3. Increasing the SCR system will cause an increase in exhaust pressure loss and affect the power of the engine

The above-mentioned SCR catalytic converter still has uneven concentration distribution, and the pressure loss is large. The injected urea is fully converting NO X At the same time, NH 3 Leakage and other issues

Images