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Urea heating device for efficient SCR, and use method thereof

A technology of heating device and urea, which is applied in the direction of muffler device, exhaust device, electric control of exhaust gas treatment device, etc. The effect of sufficient solution, avoiding urea crystallization and reducing the risk of crystallization

Inactive Publication Date: 2016-06-22
WEICHAI POWER CO LTD
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Problems solved by technology

[0014] In order to solve the problems of easy crystallization of urea in engines using SCR technology in the market, waste of energy in engine thermal management, and poor heating effect, the present invention provides a urea heating device for high-efficiency SCR and its use method. The method of adding metal carrier catalyst and ECU to control heating near the nozzle reduces the risk of high-efficiency SCR crystallization, reduces the energy consumed for engine thermal management, and realizes precise control of heating temperature and time

Method used

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  • Urea heating device for efficient SCR, and use method thereof

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Embodiment 1

[0033] A urea heating device for high-efficiency SCR, including temperature sensor 1, urea nozzle 2, metal carrier catalyst 3 and SCR4; temperature sensor 1, urea nozzle 2, metal carrier catalyst 3 are placed in front of SCR4, and the three are sequentially from front to back set on the exhaust pipe;

[0034] Temperature sensor 1, which transmits the identified temperature signal to the engine ECU;

[0035] Urea nozzle 2, the spray angle is adjustable, and the sprayed spray is just aimed at the metal carrier catalyst 3;

[0036] The metal carrier catalyst 3 is a porous structure, the inside can be heated by electricity, and the outside is connected to the vehicle power supply, and its power-on time is controlled by the engine ECU; the heating function of the metal carrier catalyst 3 is controlled by controlling the on and off of the current.

[0037] A method of using the above-mentioned urea heating device for high-efficiency SCR is as follows:

[0038] (1) Install the inle...

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Abstract

The invention relates to a urea heating device and a use method thereof, and particularly relates to a urea heating device for efficient SCR, and a use method thereof. The device comprises a temperature sensor, a urea nozzle, a metal carrier catalyst and an SCR device, wherein the temperature sensor, the urea nozzle and the metal carrier catalyst are arranged in front of the SCR device, and are sequentially arranged on an exhaust pipeline from the front to rear. According to the device disclosed by the invention, through the method of adding the metal carrier catalyst close to the urea nozzle, and carrying out ECU control heating, the crystallization risk of the efficient SCR is reduced, the energy consumed for engine heat management is reduced, and accurate control for the heating temperature and time is realized.

Description

technical field [0001] The invention relates to a urea heating device and a using method thereof, in particular to a urea heating device for high-efficiency SCR and a using method thereof. Background technique [0002] SCR: Selective catalytic reduction, this technology is the main technical means to eliminate nitrogen oxides in engine exhaust. [0003] The chemical reaction of SCR to reduce nitrogen oxides: [0004] NO+NO 2 +2NH 3 →2N 2 +3H 2 o [0005] The urea solution is sprayed into the exhaust pipe through the urea nozzle, and when the temperature is above 200°C, a pyrolysis reaction occurs to produce ammonia (NH 3 ), ammonia gas and NO in the exhaust gas under the action of the catalyst x response to achieve NO reduction x purpose of discharge. [0006] Urea pyrolysis reaction: [0007] (NH) 2 CO 2 →NH 3 +HNCO [0008] HNCO+H 2 O→NH 3 +CO 2 [0009] High-efficiency SCR technology: The conversion efficiency of SCR is controlled to be higher than 96%. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/20F01N3/28F01N9/00
CPCF01N3/2013F01N3/2073F01N3/2803F01N9/00F01N2900/1404Y02A50/20Y02T10/12Y02T10/40
Inventor 李勤李春锋王意宝崔京朋申加伟孙中泉
Owner WEICHAI POWER CO LTD
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