Structure for improving accuracy of box type aftertreatment nitrogen oxide measuring point

Abstract

The invention relates to a structure for improving accuracy of a box type aftertreatment nitrogen oxide measuring point. The structure comprises a box body, a box type purification module is arrangedin the box body, a front square partition plate and a rear square partition plate are arranged in the box type purification module, a front cavity is formed between a front space of the front square partition plate and the box body, a front exhaust temperature sensor base is arranged in the front cavity, a front square end cover is arranged on the box body at the front end of the front cavity, anair inlet pipe is connected to the front square end cover, and a urea nozzle base is arranged on the outer wall of the air inlet pipe; a space between the front square partition plate and the rear square partition plate forms a middle cavity, and a carrier assembly and a spoiler are arranged in the middle cavity; a mixing pipe is arranged above the spoiler, a rear square end cover is arranged at the tail end of the box body corresponding to the rear cavity, and an air outlet pipe is connected to the rear square end cover. The structure is simple, compact and reasonable, ammonia gas and tail gas can be fully mixed, the accuracy of the nitrogen oxide measuring point is greatly improved, and it is ensured that the nitrogen oxide in exhaust gas emission reaches the standard.

Description

technical field [0001] The invention belongs to the technical field of diesel engine tail gas treatment systems, and in particular relates to a structure for improving the accuracy of measuring points of nitrogen oxide compounds in box-type post-treatment. Background technique [0002] With the development of diesel engine technology, it is one of the main post-treatment technologies to eliminate nitrogen oxides in diesel engine exhaust. The urea aqueous solution is sprayed into the aftertreatment through the urea nozzle, and a pyrolysis reaction occurs within a sufficient temperature to produce the required reducing agent ammonia (NH3). Nitrogen oxides (NOx) reaction to achieve the purpose of eliminating the harmful emissions of nitrogen oxides (NOx) from diesel engines. However, in the box-type post-processing, the SCR post-chamber has a large space and the unstable air flow rate leads to unstable detection of nitrogen oxides (NOx), resulting in excessive emissions. Con...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art, to solve the problem of excessive discharge caused by the unstable detection of nitrogen oxides (NOx), and to provide a box-type post-treatment nitrogen and oxygen Compound Spot Accuracy Structure

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