Preparation and filling method of solid ammonia storage material for aftertreatment control unit

Abstract

The invention relates to a post-processing control unit of active matter ammonia storage and supply in a pump auxiliary afterheat manner, which is characterized in that an electronic control unit is connected with a solenoid valve, a gas conveying pump and a proportional valve through a signal harness; a tail gas inlet temperature sensor, an NOX sensor, a pressure sensor and a withstand voltage tank temperature sensor are connected with the signal input end of the electronic control unit through a signal line; an anti-freezing liquid conveying pipe passes through the inside of a withstand voltage tank; a solid ammonia storage material is filled in the withstand voltage tank; an air filter is positioned at the gas outlet end of the withstand voltage tank; the induction end of the withstand voltage tank temperature sensor is inserted into the solid ammonia storage material; the induction end of the pressure sensor is positioned in the withstand voltage tank and is not in contact with the solid ammonia storage material; the air filter is connected with a reducing agent conduit through a reducing gas conveying pipe; a spray nozzle of the reducing agent conduit is inserted into a pipeline of a tail gas inlet pipe; and the gas outlet end of an SCR (Selective Catalytic Reduction) postprocessor is connected with a tail gas exhaust pipe; and the tail gas inlet temperature sensor and the NOX sensor are connected with the tail gas inlet pipe, and the induction ends of the tail gas inlet temperature sensor and the NOX sensor are positioned in the pipeline of the tail gas inlet pipe. The system has the characteristic of flexibility, can satisfy the emission control target in the low-temperature cold start of a vehicle, is low in price, high in reliability and convenient in use, is used for an SCR national level-4 system or above, can also be used for an FCEV (Fuel Cell Electric Vehicle) system and satisfies the application demands of the future automobile industry.

Description

Technical field [0001] The invention relates to a preparation and filling method of a solid ammonia storage material used in a post-processing control unit, which is applied to the SCR post-processing industry of automobile exhaust gas and is also suitable for FCEV energy storage systems of fuel cells. Background technique [0002] Currently, the world is facing comprehensive challenges in energy and environment. People still face many difficulties in the selection of technical means for traditional automobile emission standards, such as how to choose post-processing technical methods. [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 temperatures. The ammonia as a reducing agent and the NOX in the engine exhaust react under the combined action of the catalyst and temperature, and it is generat...

AI Technical Summary

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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