Inner flame burner for regeneration of diesel particulate filter

Abstract

Provided is a burner for regenerating a diesel engine particulate filter. The burner includes: a combustion chamber for receiving exhaust gas from a diesel engine; a carburetor for gasifying liquid fuel; a mixed gas supplying unit for mixing the gasified fuel with an external air, and supplying the mixed gaseous fuel to the combustion chamber; a mixed gas storing chamber disposed in the combustion chamber for receiving the mixed gaseous fuel and instantly storing the received mixed gaseous fuel; an inner flame combustor made of porous material for injecting the mixed gaseous fuel toward the inside of the inner flame combustor, and disposed in the combustion chamber to allow an exhaust gas to flow through the inner flame combustor; an igniter for igniting the mixed gaseous fuel; and a flame sensor for sensing the flame on the inner flame combustor.

Description

TECHNICAL FIELD[0001]The present invention relates to a diesel particulate filter (DPF); and more particularly, to a burner for regenerating a DPF that reduces soot by filtering soot particles included in an exhaust gas outputted from a diesel engine.BACKGROUND ART[0002]Diesel engines have been generally equipped in trains, vessels, and commercial vehicles. Also, diesel passenger vehicles came out to the market, recently. Thus, the use of diesel engines has increased.[0003]As the use for diesel engines has increased, the large amount of particulate matters (PM) such as soot and soluble organic fraction (SOF) are produced from the diesel engines. Since such particulate matters (PM) are major factors for environment pollution, especially, air pollution. Therefore, the regulation of diesel engines has become tightened.[0004]In order to resolve the pollution problem of diesel engines, a diesel particulate filter (DPF) was introduced. The DPF collects soot outputted from a diesel vehicle...

AI Technical Summary

Benefits of technology

[0034]A burner for regenerating a diesel particulate filter according to the present invention has following advantages.

[0035]At first, the burner according to the present invention can instantly ignite and extinguish flames because the burner includes an inner flame combustor that is formed of porous metal fiber having a plurality of fine flame holes. After forming the flame on the inner flame combustor, the burner can stably sustain the flames in the flow of exhaust gas when the exhaust gas flows into a combustion chamber, when the engine is kept ticking over, when the engine is driven at a constant speed. Also, the inner flame burner according to the present invention can sustain the flame stably while the exhaust gas outputted from the diesel engine flows into the combustion chamber, and when the amount of flowing the exhaust gas and the pressure thereof abruptly change due to the abrupt variation of the load of the diesel engine.

[0036]Since the burner according to the present invention includes the inner flame combustor having a comparatively larger surface by forming the inner flame combustor made of porous material in a cylinder shape, and a rectangle pipe shape, the heat can be transferred quickly from the flames to the exhaust gas, and the constant temperature is uniformly sustained in the combustion chamber.

[0037]Furthermore, the burner according to the present invention swirls the exhaust gas to move soot particles in the exhaust gas toward the edges of the flow of the exhaust gas and forms the flames along the edges to effectively oxidize the soot particles so as to reduce the concentration of the soot particles in the exhaust gas that flows into the filter. Therefore, the life time of the filter is lengthened because the low concentrated exhaust gas flows into the filter, and the amount of fuel wasted for forming flames is reduced because the burning interval of the burner is also lengthened.

[0038]In addition, the inside wall of the combustion chamber is lined with heat resistant material such as ceramic and firebrick to insulate and to accumulate heat at the same time, and the insulating material can be sustained to be clean because the soot particles on the insulating material are oxidized by the accumulated heat.

[0039]Moreover, the burner according to the present invention effectively regenerates a diesel particulate filter by stably sustaining the flames. Therefore, the burner can effectively prevent the environmental pollution caused by the exhaust gas.

Problems solved by technology

That is, it is very difficult to stably sustain when the amount of following the exhaust gas outputted from the engine and the pressure conditions change abruptly.

Thus, the flame uncontrollably shakes in the exhaust gas, and is easily extinguished.

These shortcomings make the conventional DPF to become unpractical.

In this case, it is very difficult to increase or sustain the temperature in the exhaust gas channel 20 because the abrupt variation makes the flame instable and to be extinguished.

Accordingly, the regeneration of the filter through oxidizing the soot particles trapped in the filter becomes difficult.

However, the conventional burner cannot sustain the flame stably or often extinguishes the flame when the driving conditions of the diesel engine abruptly change, for example, when the diesel engine accelerates or decelerates.

In this case, the conventional burner cannot smoothly burn the soot particles trapped in the filter 11.

Therefore, the state of the diesel particulate filter is getting deteriorated.

Finally, the filter 11 becomes incapable of filtering diesel particulate.

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