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

Abstract

The invention, which relates to the technical field of diesel tail gas postprocessing, particularly discloses a multi-probe sampling device comprising a flange, gas taking pipelines, a propulsion mechanism and a driving mechanism. The flange includes a main flange body portion and a flange support portion; and the flange support portion is connected to one side of the main flange body portion. Atleast one through hole is formed in the side wall of one side of the main flange body portion; a guide pipe joint is arranged in each through hole; and each guide pipe joint is connected with one guide pipe and the guide pipe and the flange support portion are arranged at the same side. One end, being away from the guide pipe joint, of the guide pipe passes through the propulsion mechanism and isfixedly connected with the propulsion mechanism. The driving mechanism and the propulsion mechanism are connected; and one gas taking pipe is connected with one end, away from the guide pipe joint, ofeach guide pipe. In addition, the invention also discloses an ammonia gas mixing uniformity testing system and method of an SCR system. With the disclosed multi-probe sampling device, the test accuracy of the ammonia gas mixing uniformity can be improved.

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 realizes the selective conversion of NOx by spraying urea aqueous solution that can be decomposed into NH3 into the post-processor. The uniformity of NH3 distribution in the SCR catalyst directly determines the conversion efficiency of NOx and the utilization rate of the catalyst. Under the current technical conditions, improving the atomization effect of urea and adding urea mixers are often used to improve the distribution uniformity of NH3, and the distribution uniformity index of NH3 on the end surface of the SCR catalyst is obtained by CFD simulation method, so as to ...

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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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