Urea crystallization state monitoring method of catalytic reduction reaction device and storage medium

Abstract

The application discloses a urea crystallization state monitoring method of a catalytic reduction reaction device and a storage medium. The method comprises the steps: obtaining exhaust effective energy and obtaining urea evaporation heat absorption energy; if the exhaust effective energy is greater than the urea evaporation heat absorption energy, obtaining a crystal elimination amount; otherwise, obtaining a crystal generation amount; obtaining the urea crystallization amount in the post-treatment according to the original crystallization amount, the crystal elimination amount and the crystal generation amount of the catalytic reduction reaction device; and if the urea crystallization amount in the post-treatment is greater than or equal to the urea crystallization amount limit value, triggering a de-crystallization treatment mode. According to the method provided by the invention, the crystallization state is judged on the basis of the difference between the real-time energy of thewaste gas and the energy required by urea decomposition, and when the crystallization amount of urea exceeds a threshold value, the de-crystallization treatment mode can be triggered in time, so thatcrystals are prevented from being further chemically reacted into stones, the conversion efficiency of the catalytic reduction reaction device is improved, and the risk of corrosion of an exhaust pipeis avoided.

Description

technical field [0001] The present application relates to the field of vehicle technology, in particular to a method for monitoring the crystallization state of urea in a catalytic reduction reaction device and a storage medium. Background technique [0002] SCR, selective catalyst reduction, is a selective catalytic reduction reactor, which is used to reduce the nitrogen oxides emitted by the engine through the urea injection system. When the injection amount of urea is inappropriate or the structure of the mixer is too simple, the uniformity of urea distribution is too poor, which will lead to blocky or powdery urea crystals appearing on the SCR tank or the urea nozzle. In the actual application process, the crystallization of urea cannot be judged. In the prior art, the connection structure between SCR and diesel engine is as follows figure 1 shown. Contents of the invention [0003] The purpose of this application is to provide a method for monitoring the crystalliz...

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Problems solved by technology

When the urea injection amount is inappropriate or the mixer structure is too simple, the urea distribution uniformity is too poor, which will lead t...

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