Device and method for detecting urea quality for post-treatment SCR system for agricultural machinery engine

Abstract

The invention discloses a device and method for detecting urea quality for a post-treatment SCR system for an agricultural machinery engine. The device comprises a post-treatment SCR catalyst, a ureatank, a data acquisition sensor network and a urea concentration calculation unit; the post-treatment SCR catalyst is used for converting NO<x> in tail gas discharged by the engine; the urea tank is used for storing a urea aqueous solution; and the urea concentration calculation unit calculates the urea concentration according to data measured by the data acquisition sensor network. According to the device, sensors for detecting gas with different components are additionally arranged on the upstream and downstream parts of the SCR catalyst, mathematical assumption and chemical reaction modeling are carried out according to the data measured by the different sensors, the urea temperature data and concentration data are calculated, and the urea quality is detected and evaluated according tothe temperature data and the concentration data. According to the technical scheme, hardware detection equipment is simplified, the detection mode is simplified, and the cost for detecting the urea quality is greatly reduced.

Description

technical field [0001] The invention relates to the field of tail gas treatment of agricultural machinery engines, in particular to a device and method for detecting urea quality in an SCR system for aftertreatment of agricultural machinery engines. Background technique [0002] In recent years, non-road national diesel engine emission regulations have affected NO in the exhaust of agricultural machinery engines. x content put forward increasingly stringent requirements, our country currently adopts to reduce NO on diesel engine x The mainstream measure of emissions is to install an after-treatment SCR system behind the engine exhaust pipe. Under the action of the catalyst inside the SCR catalyst, NO x with reducing agent NH 3 The reaction converts to N 2 and H 2 O, in order to effectively reduce NO x emission goals. And the key reducing agent NH 3 The most extensive source of urea solution is the urea solution. Whether the quality of the urea solution is qualified w...

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Problems solved by technology

[0004] The existing technical solution, on the one hand, the urea sensor or the urea quality detector integrated with the urea quality detection function is expensive, and basically has not been applied in the field of urea quality detection in the SCR system of the agricultural engine engine post-processing; on the other hand, the post-processing system of the agricultural diesel engine engine The emission control scheme aims to solve the emission control problem from the perspective of system structure and filtration devices. There is no in-depth study on the urea quality detection problem that needs to be solved urgently in the field of agricultural machinery. It can be said that a major function is missing at present.

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