Diesel engine aftertreatment system
A diesel engine and post-processing technology, which is applied in the direction of mechanical equipment, engine components, machines/engines, etc., can solve the problems of low integration, poor injection accuracy of reductant, long system length, etc., and achieve small overall space, easy precise control, low cost effect
Inactive Publication Date: 2018-01-09
GUANGXI YUCHAI MASCH CO LTD
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Problems solved by technology
[0013] The purpose of the present invention is to provide a diesel engine aftertreatment system, so as to solve the problems in the prior art that the system length is too long, the integration is low, and the injection accuracy of the reducing agent is poor
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[0029] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0030] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.
[0031] like figure 1 and figure 2 As shown in FIG. 1 , are respectively a schematic diagram of the device composition of the SCR system and a structural block diagram of the SCR system according to a specific embodiment of the present invention. The diesel engine aftertreatment system of the present invention is applied to a diesel engine with a turbocharger, and the SCR system includes: exhaust pipe 1, catalytic muffler...
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Abstract
The invention discloses a diesel engine post-treatment system, which comprises: an exhaust pipe, a catalytic muffler, a NOx sensor, a blue tank, a metering injection pump, a mixer and a blue nozzle. Among them, the catalytic muffler is connected with the exhaust pipe, which is used to reduce the nitrogen oxides in the exhaust gas and reduce the exhaust noise of the engine; the Tianlan tank is equipped with Tianlan pump, sensor and heater, which is used to hold the urea aqueous solution; metering injection The pump is integrated with a metering controller DCU, which is used to calculate the injection volume of urea solution. The metering controller DCU has OBD function; the mixer is set on the exhaust pipe; the blue nozzle is set on the mixer, and through the blue The pipeline is connected with the metering injection pump, which is used to inject the metered urea aqueous solution into the exhaust pipe according to the instruction of the metering controller DCU. The diesel engine post-treatment system has the advantages of reasonable design, simple structure, high integration, high urea injection and atomization efficiency, and low cost.
Description
technical field [0001] The invention relates to aftertreatment of diesel engine tail gas, in particular to a diesel engine aftertreatment system. Background technique [0002] The working principle of the existing diesel aftertreatment system SCR system (SCR is the English abbreviation of Selective (selective), Catalytic (catalytic) and Reduction (reduction)) is to inject the reducing agent into the exhaust pipe, and the nitrogen and oxygen in the exhaust The compound reacts with the reducing agent under the action of the catalyst and is reduced to nitrogen and water. The reducing agent currently used in the SCR system is urea. Urea NH 2 CONH 2 Add H 2 O decomposes into NH at high temperature 3 and CO 2 : [0003] NH 2 CONH 2 +H 2 O-=2NH 3 +CO2 [0004] NH 3 Recombination of NO and NO in the exhaust 2 The reaction produces nitrogen and water: [0005] NO+NO 2 +2NH 3 -=2N 2 +3H 2 o [0006] 4NO+O 2 +4NH 3 -=4N 2 +6H 2 o [0007] 2NO 2 +O 2 +4NH 3 -=...
Claims
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Login to View More IPC IPC(8): F01N3/28F01N13/08
Inventor 周道林黄第云林铁坚王辉
Owner GUANGXI YUCHAI MASCH CO LTD