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

A technology for ammonia storage, ammonia supply, and control unit, which is applied to the electronic control of exhaust treatment devices, exhaust treatment, engine components, etc. It can solve problems such as no clear instructions, technical personnel can’t implement, and no increase ratio, etc., to achieve full usability effect

Active Publication Date: 2016-11-23
CHINA FIRST AUTOMOBILE
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  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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preparation example Construction

[0025] The preparation and filling method of the described solid ammonia storage material 6 are as follows: adopt 58 parts of industrial anhydrous magnesium chloride, 2 parts of expanded graphite, 15 parts of deionized water, 10 parts of industrial ethanol and 15 parts of industrial spherical clay. Mix and stir with a noodle mixer to form a wet powder. The mixing time is 5-15 minutes. Fill it into the main ammonia storage tank 4 and the auxiliary ammonia storage tank 5 through the feeding port 8. Vibrate the tank body by mechanical vibration for 5-10 minutes. Remove the air gap in it, and add the amount of material to 40% of the volume capacity of the tank; put the whole tank in a vacuum oven, start heating from room temperature 25°C under normal pressure, average 5°C / 10min, raise the temperature to 70°C, and heat When drying, the feeding port 8 is opened to discharge water vapor and alcohol vapor; keep at this temperature for 30 minutes, then start the vacuum pump at this temp...

Embodiment 1

[0029] The main ammonia storage tank 4 and the auxiliary ammonia storage tank 5 are pressure-resistant tanks made of stainless steel. The thickness of the tanks is 4-5mm, cylindrical, and a layer of nylon insulation is thermally sprayed inside the tanks.

[0030] The residual heat of the engine coolant is used to heat the active material so that it releases ammonia under appropriate conditions; however, in order to ensure that the exhaust temperature of the vehicle is low during cold start and the temperature of the engine coolant is not enough, the secondary ammonia storage tank 5 is used In the early stage of vehicle startup, the auxiliary ammonia storage tank 5 heated by the on-board storage battery 22 meets the ammonia supply requirements of the system, and this function is realized by the relay switch 21, storage battery 22 and electric heating wire 23; In practice, it can be set that the auxiliary ammonia storage tank 5 supplies ammonia for the first 20 minutes of vehicle...

Embodiment 2

[0038] The structural part of the system remains unchanged, but changes are made in the preparation method of the solid ammonia storage material 6. The specific process is as follows: 58 parts of industrial anhydrous magnesium chloride, 2 parts of expanded graphite, 15 parts of deionized water, 10 parts of industrial ethanol and industrial 15 parts of ball clay, 2.5kg of the mixture is prepared; use a mechanical dough mixer to mix evenly into a wet powder, gradually fill it into the auxiliary ammonia storage tank through the auxiliary feeding port, and use the method of mechanical vibration to shake the pressure-resistant tank during the process 5~10min; put the whole tank into a vacuum oven, start heating at room temperature at 25°C under normal pressure, average 5°C / 10min, and heat up to 70°C. When heating and drying, the main feeding port is open; keep at this temperature for 30min , and then start the vacuum pump at this temperature, gradually evacuate, three times to make ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N9/00F01N3/10F02G5/00
CPCY02A50/20Y02T10/12Y02T10/40
Inventor 张克金杨光伟崔龙陈慧明王金兴荣常如姜涛安宇鹏
Owner CHINA FIRST AUTOMOBILE
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