After-treatment control unit with electric heating and waste heat storage for ammonia supply

Abstract

The invention relates to a post-processing control unit for ammonia storage and supply with electric heating and waste heat, which is characterized in that it uses the waste heat of the engine's return coolant to heat active ammonia storage compounds to release ammonia, and according to the engine exhaust process The SCR system relies on the control unit to introduce ammonia into the front end of the SCR post-processor to realize non-liquid urea delivery injection and atomization decomposition; the difference is that the system has two active material storage tanks, namely the main ammonia storage tank and the main ammonia storage tank. Auxiliary ammonia storage tank, in which the main ammonia storage tank is heated by the waste heat of the engine coolant, and the auxiliary ammonia storage tank is heated by the vehicle battery; when starting the vehicle, the auxiliary ammonia storage tank is first activated to respond quickly and reduce pollutant emissions during cold start ; The system has the characteristics of flexibility, not only can meet the emission control target when the vehicle is cold-started at low temperature, it is cheap, high reliability, and easy to use; it can be used in SCR national 4 or above systems, and can also be applied to FCEV systems to meet the requirements of the future automotive industry Application requirements, with practical value.

Description

technical field [0001] The invention relates to an aftertreatment control unit for ammonia storage and supply with electric heating and waste heat, which is mainly used in the SCR aftertreatment industry of automobile exhaust, and is also suitable for FCEV energy storage systems of fuel cells. Background technique [0002] At present, the world is facing comprehensive challenges of energy and environment. In terms of the selection of technical means to meet the emission standards of traditional vehicles, people still face many difficulties, for example, how to choose the technical means of after-treatment and so on. [0003] SCR (Selective Catalytic Reduction) catalytic conversion reduction technology is a traditional post-treatment technology. The essence of this traditional SCR technology using liquid urea is to use urea to decompose ammonia at high temperature, ammonia as a reducing agent and NO in engine exhaust X The reaction is carried out under the combined action o...

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Problems solved by technology

[0016] Patent No. CN200680005886.2 for 'High Density Storage of Ammonia' contains solid ammonia storage and delivery materials for ammonia absorbing / desorbing solid materials that have been compacted to a density greater than 50% of the theoretical skeletal density The material provides a solid ammonia storage material. The metal salt solid material described in this patent is also directly molded. It is stated that a binder is used. It only states that a silica fiber binder may be used, and there is no dosage ratio. Without clearly stating the details of other ingredients used, it is almost impossible for skilled personnel in this field to implement

[0017] The search and analysis of the above-mentioned patents show that the use of active ammonia storage compounds to adsorb and decompose ammonia forms an aftertreatment system applied to vehicles, which has not been reported yet.

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