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System and method for reducing NOx and particles in emitted pollutants of diesel engine

A pollutant, diesel engine technology, applied in the charging system, fuel supply device, mechanical equipment, etc., can solve the problems of increased use cost, poor emissions, urea consumption, etc. Effects of NOx Emissions

Inactive Publication Date: 2015-12-23
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are several problems in the application of this technology. One is that it increases the user's cost of use. While consuming diesel oil, urea is also consumed, and urea is only used to reduce emissions and does not participate in combustion, becoming a simple consumable
The second is that not using urea will make the emission worse. When it is inconvenient to add urea in some places, if the SCR system does not work, the NOx emitted by diesel vehicles will be much higher (more than twice) than that of previous vehicles.

Method used

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  • System and method for reducing NOx and particles in emitted pollutants of diesel engine
  • System and method for reducing NOx and particles in emitted pollutants of diesel engine
  • System and method for reducing NOx and particles in emitted pollutants of diesel engine

Examples

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Embodiment

[0019] Added methanol supply system and methanol injection control system to a D10.31-40M six-cylinder supercharged intercooled electronically controlled common rail diesel engine produced by Sinotruk, and added DOC+POC integration at its exhaust pipe body postprocessor.

[0020] attached figure 1 It is the working principle diagram of the methanol supply and control system in this technical solution: after the methanol system is started, the methanol pump starts to work. Alcohol outlet and return pipelines are installed on the methanol tank. Under the action of the suction of the methanol pump, methanol first passes through the filter screen installed in the tank and enters the alcohol outlet pipeline. The filter screen is a coarse filter, and the purpose is to filter out the large particles of impurities that may exist in the methanol tank; the methanol that passes through the filter It is further purified, and then passes through the methanol pump, the pressure limiting v...

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Abstract

The invention relates to a technology for reducing emissions of a diesel engine, in particular to a system and method for reducing NOx and particles in emitted pollutants of the diesel engine. The system for reducing the NOx and the particles in the emitted pollutants of the diesel engine comprises an independent methanol injection system added to a gas inlet pipe of the engine and an oxidation catalytic converter (DOC)+particle oxidation catalytic converter (POC) integrated body special for methanol added to a gas discharge pipe of the engine. Compared with the prior art, the system and method have the advantages that in the method, the methanol takes part in combustion serving as both fuel and an emission improver, so that it is unlike that urea is only used for controlling emissions in the existing selective catalytic reduction (SCR) art; the general oil consumption is reduced; the cost of the fuel is lowered; users accept the system and method more easily.

Description

Technical field: [0001] The invention relates to a technology for reducing diesel engine emissions, in particular to a system and method for reducing NOx and particulates emitted by diesel engines. Background technique: [0002] The main pollutants emitted by diesel engines are NOx and particulate matter, and there is a trade-off relationship between the two. At present, the main technical measures to reduce NOx and particles emitted by diesel engines are to advance the fuel injection and increase the combustion temperature in the cylinder to greatly reduce the emission of particulate matter, which is accompanied by a substantial increase in the emission of nitrogen oxides and NOx. For this part of the increased NOx emissions, the method of selective catalytic reduction SCR is adopted, that is, urea is injected into the exhaust gas to reduce NOx emissions. This technology has become the most important technical route for discharging heavy trucks. However, there are several...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M21/02F02M61/14F01N3/28F01N13/08F02D41/30
CPCY02T10/30
Inventor 姚春德韩国鹏姚安仁
Owner TIANJIN UNIV
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