Multi-probe sampling device, testing system and method for uniformity of ammonia gas mixing

Abstract

The invention relates to the technical field of post-treatment of diesel engine exhaust, and specifically discloses a multi-probe sampling device, which includes: a flange, an air intake pipeline, a propulsion mechanism, and a driving mechanism; the flange includes a flange main body and a flange support portion, The flange support part is connected to one side of the flange main part, at least one through hole is arranged on the side wall of one side of the flange main part, and an air guide tube joint is arranged in each through hole, and each air guide tube joint is Connect an air guide tube, the air guide tube is set on the same side as the flange support part, the end of the air guide tube away from the air guide tube joint passes through the propulsion mechanism and is fixedly connected with the propulsion mechanism, the drive mechanism is connected with the propulsion mechanism, and each air guide tube is away from the air guide tube One end of the joint is connected with a gas-taking pipeline. The invention also discloses a testing system and method for the mixing uniformity of the ammonia gas in the SCR system. The multi-probe sampling device provided by the invention can improve the test accuracy of the mixing uniformity of ammonia gas.

Description

technical field [0001] The invention relates to the technical field of post-treatment of diesel engine exhaust, in particular to a multi-probe sampling device, a test system for testing the uniformity of ammonia gas mixing in an SCR system comprising the multi-probe sampling device, and a method for testing the uniformity of ammonia gas mixing in the SCR system. Background technique [0002] SCR technology can be decomposed into NH by injecting into the post-processor 3 urea aqueous solution to realize the selective conversion of NOx. NH 3 The uniformity of distribution in the SCR catalyst directly determines the conversion efficiency of NOx and the utilization rate of the catalyst. Under the current technical conditions, it is often used to improve the atomization effect of urea and increase the urea mixer to improve the NH 3 The uniformity of distribution, and the NH obtained by CFD simulation method 3 The distribution uniformity index on the end face of the SCR cataly...

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Problems solved by technology

[0004] The invention provides a multi-probe sampling device, a test system for the uniformity of ammonia gas mixing in an SCR system including the multi-probe sampling device, and a test method for the uniformity of ammonia gas mixing in the SCR system, which solves the problem of ammonia gas in the SCR in the related art. The problem of low test accuracy of the distribution uniformity of the system intake cross-section

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