Auxiliary ammonia uniformity testing equipment and testing method thereof

Abstract

The invention provides auxiliary ammonia uniformity testing equipment and a testing method thereof. The testing method includes: firstly, testing weight of crystallization state test part of a postprocessing system of a diesel vehicle; secondly, performing a urea heat flow test; finally, testing a weight variation of the crystallization state test part again, testing ammonia concentrations of different positions of the crystallization state test part through the auxiliary ammonia uniformity testing equipment, and evaluating to obtain urea uniformity. The auxiliary ammonia uniformity testing equipment is capable of testing the ammonia concentrations of different positions of a tested object, and has the advantages of simplicity in operation, low failure rate, accuracy in test points and lowcost.

Description

technical field [0001] The invention relates to a technology in the field of tail gas post-treatment, in particular to an auxiliary detection device for testing the uniformity of ammonia and a testing method thereof. Background technique [0002] In order to meet the emission requirements of diesel vehicles above National IV, medium and heavy-duty diesel vehicles generally adopt selective catalytic reduction technology, but these medium and heavy-duty diesel vehicles still produce a large amount of urea crystallization. At present, for the problems of urea crystallization risk and ammonia uniformity, we use computational fluid dynamics analysis to confirm the rationality of the post-treatment system structure, but the results of computational fluid dynamics analysis do not necessarily represent the actual situation of urea crystallization The uniformity of ammonia and ammonia is also good, but it is not enough to explain the real situation, so an effective method is needed t...

AI Technical Summary

Problems solved by technology

At present, in view of the risk of urea crystallization and the uniformity of ammonia, we use computational fluid dynamics analysis to confirm the rationality of the post-treatment system structure. However, good results of computational fluid dynamics analysis do not necessarily represent urea crystallization in actual situations. Even the uniformity of ammonia and ammonia is not enough to explain the real situation, so it is necessary to have an effective method to verify the rationality of the system structure

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