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SCR temperature control system

A technology of temperature control system and control valve, which is applied in the direction of electronic control, exhaust gas treatment, mechanical equipment, etc. of exhaust gas treatment device, which can solve the problems of inoperable SCR system, freezing of reducing agent, etc. The effect of small quantity and simple system structure

Inactive Publication Date: 2014-01-15
TIANJIN YILI AUTOMOTIVE EMISSION CONTROL +1
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The problem to be solved by the invention is that in the SCR system that uses substances with a higher freezing point such as urea aqueous solution as the reductant, the reductant will freeze at low temperatures, resulting in the failure of the SCR system

Method used

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Embodiment Construction

[0030] Take the pneumatic urea injection system as an example, such as figure 1 As shown, the SCR temperature control system includes a control unit, an electric control circuit 3, a heater 5 set on the urea pipeline 7, a urea injection solenoid valve 6, a coolant solenoid valve 4, and a temperature sensor 2 and a pressure sensor installed on the urea tank. The sensor 1 and the control unit are respectively connected and communicated with the urea pipeline heater 5 , the urea injection solenoid valve 6 , the coolant solenoid valve 4 , the temperature sensor 2 and the pressure sensor 1 through the electric control circuit 3 .

[0031] The SCR temperature control system also includes a triple solenoid valve 8 set on the gas pipeline 9. The gas pipeline 9 includes a gas one-way, a gas two-way and a gas three-way; The air valve 1a in the valve 8 is connected to the urea tank; one end of the gas 2 circuit is connected to the urea tank, and the other end leads to the atmosphere thro...

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Abstract

The invention provides an SCR temperature control system. The SCR temperature control system comprises a control unit, an electric control line, a reducing agent pipe heater, a reducing agent ejector, a cooling liquid control valve and a reducing agent storage container sensor, wherein the control unit is connected with the reducing agent pipe heater through communication, the reducing agent ejector, the cooling liquid control valve and the reducing agent storage container sensor. The SCR temperature control system is simple in structure, has few parts, and is low in cost; the control unit utilizes modularization design, and installation and replacement are facilitated; the reducing agent ejector has the unfreezing function and halt evacuation ability when used at lower temperature, a pipe is prevented from being frozen, and safety and stability are high.

Description

technical field [0001] The invention relates to a control system, especially a temperature control system of an SCR device for treating vehicle exhaust. Background technique [0002] SCR (Selective Catalytic Reduction) is a selective reduction technology, SCR technology uses ammonia (NH 3 ) or urea water solution (Urea water solution) as a reducing substance, at a certain temperature and under the action of a catalyst, using NH 3 Reducing NOx to environmentally friendly nitrogen (N 2 ) and water (H 2 o). The system will NH 3 Or the urea aqueous solution is supplied to the exhaust pipe of the SCR, so that it reacts with the NOx emission under the action of the catalyst to reduce the NOx emission in the exhaust gas. However, among commonly used reducing agents, for example, urea aqueous solution freezes at about -11° C., so the urea aqueous solution cannot be supplied in cold weather. Therefore, an SCR temperature control system for thawing control is installed on the SC...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N3/20
CPCY02A50/20Y02T10/12Y02T10/40
Inventor 龙顺洪赵中煜徐帅刘玉彬赵彩俊
Owner TIANJIN YILI AUTOMOTIVE EMISSION CONTROL
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