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Device for melting and quantitatively spraying solid urea

A technology of solid urea and urea injection, applied in the field of denitrification, can solve the problems of difficult storage, energy consumption, easy to freeze, etc., and achieve the effect of easy operation

Inactive Publication Date: 2014-04-30
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, urea aqueous solution is easy to freeze and difficult to store at low temperature; and during the pyrolysis process of urea aqueous solution, most of the energy will be consumed in order to evaporate the water in urea

Method used

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  • Device for melting and quantitatively spraying solid urea
  • Device for melting and quantitatively spraying solid urea
  • Device for melting and quantitatively spraying solid urea

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Embodiment 1

[0023] see Figure 5 and combine Figure 4, which shows a scheme of the device according to the present invention. In this scheme, the device for melting solid urea and injecting quantitatively according to the present invention is installed on the SCR processor located in the exhaust gas pipeline. In this embodiment, the volume of the urea storage tank 1 is 10 L, and the volume of the urea melting tank 4 is 300 ml. When the exhaust gas starts to be discharged, the sensor (electrochemical gas sensor can be selected, with an accuracy of 1ppm, which belongs to the electrical signal sensor, and the model can be selected as A-21 gas sensor, and the manufacturer is Shanghai Senchuang Electronic Technology Development Co., Ltd.) collects the exhaust signal, and Send the tail gas signal to the ECU, and the ECU then sends an instruction to the heating device 43 of the melting tank, and the heating device 43 starts heating, and at the same time, the temperature sensor 42 (a commonly u...

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Abstract

The invention belongs to the technical field of denitration during automobile exhaust treating process, and particularly relates to a device for melting and quantitatively spraying solid urea. The device sequentially consists of a urea storage tank, a urea particle delivery pipe, a urea delivery valve, a urea melting box and a urea spraying device, wherein the urea delivery valve is installed on the urea particle delivery pipe, and a temperature sensor and a urea heating device are arranged in the urea melting box; urea particles in the urea storage tank pass by the urea particle delivery pipe, then enter the urea melting box, are heated to the molten state and then enter the urea spraying device; and under the control of an external electronic control unit (ECU) circuit, the practical required amount of urea liquid is sprayed to a selective catalytic reduction (SCR) catalytic converter which is installed in an automobile exhaust pipeline. The device provided in the invention can be effectively used in the field of ammonia production through decomposing urea, and has the characteristics of energy saving and convenience in operation.

Description

technical field [0001] The invention belongs to the technical field of denitrification in the treatment process of motor vehicle tail gas, and in particular relates to a device for melting solid urea and quantitatively injecting it. Background technique [0002] In recent years, the rapid development of my country's automobile industry has made significant contributions to the national economy and social development. But at the same time, a series of problems such as traffic congestion, air pollution, and energy crisis have also emerged. Due to the massive use of buses and diesel trucks in big cities, the pollution is very serious. The annual NOx emissions in my country exceed 11 million tons, and there is an increasing trend. NOx in motor vehicle exhaust is a serious hazard to humans and the environment. Removing NOx in exhaust gas has become an urgent problem to be solved in the process of exhaust gas aftertreatment. Ammonia Selective Catalytic Reduction (NH 3 -SCR) is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/20F01N9/00
CPCY02T10/47Y02A50/20Y02T10/40
Inventor 韩炜李骏韩旭张贺张克金张苡铭韩建曹雅彬周亮王磊
Owner JILIN UNIV
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