Non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method

A technology for heavy-duty diesel engines and vehicles. It is applied in the direction of noise reduction devices, exhaust devices, and electronic control of exhaust gas treatment devices. It can solve problems such as reducing NH, improve NOX conversion rate, improve and reduce NH3 escape amount, and reduce NH3. The effect of escape volume

Inactive Publication Date: 2012-12-12
陈志华
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, since the SCR system of non-vehicle heavy-duty diesel engines has a larger injection volume of urea aqueous solution than that of automotive diesel engine SCR systems, a series of new problems arise: the flow rate of urea aqueous solution tends to be unstable, and aft...

Method used

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  • Non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method

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Embodiment Construction

[0039] Please refer to shown in Fig. 1, it is the preferred embodiment system device diagram of the present invention, comprises reactor 1, and reactor 1 is provided with deflector grille 4, mixer 2, diffuser 16 and catalyst 15 successively from tail gas inlet to tail gas outlet Between the diversion grid 4 and the mixer 2 is the mixing tube 5 where the exhaust gas and urea solution are mixed, wherein the diversion grid 4 is a porous mesh grid structure, and the mixer 2 is a blade staggered stacked structure The device can also be replaced by an impeller to facilitate the generation of vortex and make the mixed gas mix more evenly. The diffuser 16 is a steel plate densely covered with through holes, and the catalyst 15 is selected for stacking of honeycomb catalysts. A pressure measurement unit 12, a temperature measurement unit 13 and a NO X Measuring unit 14, the aforementioned three measuring units are connected with the system control device 10 to provide each parameter va...

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Abstract

The invention relates to a non-automotive heavy-duty diesel engine SCR (semiconductor control rectifier) device and method. The non-automotive heavy-duty diesel engine SCR device comprises a reactor in which a catalyst is arranged; a measuring unit which is connected with a system control device is arranged at an exit of the rear end of the catalyst in the reactor; the system control device is connected with a spray gun through a urea solution control device; an exit end of the spray gun is arranged at a front end of the catalyst in the reactor; the measuring unit comprises at least an NOX (nitric oxide) measuring unit; the urea solution control device comprises a urea pump and a urea tank which is connected with the urea pump, and a spraying device which is connected with the urea pump; the spraying device comprises at least two one-way valves which are connected with an air compressor and the urea pump respectively; the system control device is connected with a urea pump signal control end so as to output a urea solution output signal; and the spraying device is connected with the spray gun. The device provided by the invention is provided with the spraying device and the air compressor so as to solve the problem of uniformly mixing large capacity of urea water solution with tail gas and the problem of uniform diffusion of the mixed urea water solution and the tail gas passing through the catalyst.

Description

technical field [0001] The invention relates to an SCR device, in particular to an SCR device and method for a non-vehicle heavy-duty diesel engine. Background technique [0002] The air pollution caused by NOx emitted by diesel engines has aroused strong reactions from all parties. During the 12th Five-Year Plan period, the state took the control of nitrogen oxides as a national compulsory control index and included it in the national economic and social development plan. [0003] At present, domestic research on SCR technology for vehicle diesel engines has made great progress and has entered the practical stage. SCR technology is to spray urea aqueous solution into the exhaust gas emitted by the unit. After the urea aqueous solution undergoes four steps of atomization, evaporation, pyrolysis and hydrolysis Ammonia gas is generated as follows: Evaporation: (NH 2 ) 2 CO (fog droplets) → (NH 2 ) 2 CO (solid or liquid) + H 2 O (steam) pyrolysis: (NH 2 ) 2 CO (solid or ...

Claims

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Application Information

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IPC IPC(8): F01N9/00F01N11/00F01N3/28
CPCY02T10/47Y02A50/20Y02T10/40
Inventor 陈志华
Owner 陈志华
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