Aftertreatment control unit for storing and supplying ammonia by single-stage waste heat method

Abstract

The invention relates to an aftertreatment control unit for storing and supplying ammonia by a single-stage waste heat method. The aftertreatment control unit is characterized in that the signal output end of an electronic control unit is connected with an electromagnetic valve and a proportional valve through signal wires, a pressure sensor, a pressure-tolerant tank temperature sensor, a tail gas inlet temperature sensor and a NOX sensor are connected with the signal input end of the electronic control unit; an antifreeze solution conveying pipe is positioned in a pressure-tolerant tank and arranged in a coiled mode; solid ammonia-storing materials are filled in the pressure-tolerant tank; the induction end of the pressure-tolerant tank temperature sensor is inserted into the solid ammonia-storing materials; the induction end of the pressure sensor is positioned in the pressure-tolerant tank and does not contact the solid ammonia-storing materials; an air filter is connected with a reducing agent guide pipe through a reducing gas conveying pipe; the nozzle end of the reducing agent guide pipe stretches into a tail gas inlet pipe; the proportional valve is positioned on a reducing gas conveying pipeline; the induction ends of the tail gas inlet temperature sensor and the NOX sensor stretch into a tail gas inlet pipeline; the tail gas inlet pipe is connected with the gas inlet end of a selective catalytic reduction (SCR) postprocessor; and the gas outlet end of the SCR postprocessor is connected with a tail gas outlet pipe. By the aftertreatment control unit, a combination which consists of active materials, porous materials and adhesives is taken as a carrier for storing and discharging the ammonia, so that the efficiency of charging and discharging the ammonia is improved, a system is simplified, the reliability is improved, the cost is greatly reduced, and obstacles in large-scale industrial popularization and application are eliminated.

Description

technical field [0001] The invention relates to a post-processing control unit for ammonia storage and supply in a single-stage waste heat mode, which is applied to the SCR post-processing 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 NOX in engine exhaust react under the combined action of catalyst and temperature, an...

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Problems solved by technology

[0016] Patent application number CN200680005886.2 for 'High Density Storage of Ammonia' contains solid ammonia storage and delivery materials of ammonia absorbing / desorbing solid materials that have been compacted to a density greater than 50% of the theoretical skeletal density for storage and The conveying 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 addition ratio , without clearly stating the details of other ingredients used, it is almost impossible for technical 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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