KR101292338B1 - Combustion Method of Burner Apparatus For Purifying Exhaust Emissions of Diesel Engine using Liquefied Fuel and Burner Apparatus using the Method - Google Patents

Abstract

The present invention relates to a burner combustion method and apparatus for removing particulate matter caused by unburned in an engine using liquid fuel. The apparatus is characterized in that porous liquid fuel is used to more efficiently burn particulate matter collected in a filter of a purifier. Adsorbed to the inhaler, the device is bubbled by the gas and complexed. The flame generated from the device regulates the amount of gas to be bubbled and the amount of fuel supplied to the porous inhaler to control the temperature of the flame and the length of the flame to directly burn particulate matter trapped in the diesel particle filter, and the catalyst coated or added to the filter. Combustion method and burner device for supplying the heat energy required for the reaction.

Description

Combustion Method of Burner Apparatus For Purifying Exhaust Emissions of Diesel Engine using Liquefied Fuel and Burner Apparatus using the Method}

The present invention relates to a combustion method of a burner for purifying exhaust gas of a diesel engine using liquid fuel, and a burner device using the same.

More specifically, a combustion method and a burner apparatus for purifying a diesel particulate filter (DPF) for filtering particulate matter, which is particulates contained in exhaust gas discharged on an exhaust pipe, and attached to the diesel particulate filter. In the apparatus for heating and purifying the accumulated particulate matter, a porous inhaler for absorbing fuel is formed between a supply for supplying fuel and gas and an ignition means to ignite the fuel bubbled through the pores of the porous inhaler to form a flame. The present invention relates to a combustion method of a burner and a burner device using the same, which purify a diesel particle filter more efficiently.

In general, diesel engines used in vehicles such as buses, trucks, and passenger cars are capable of driving high power and high loads while having low fuel consumption, and demand thereof is continuously increasing.

However, unburned substances such as particulate matter (PM), hydrocarbon, nitrogen oxides (NOx), sulfur compounds, carbon dioxide, and carbon monoxide, which are not completely burned in the combustion process of fossil fuels in diesel vehicles, It is known to be a major cause of serious air pollution such as ozone layer destruction and respiratory diseases.

Recently, in order to reduce the air pollution and save the global environment, researches are being conducted to reduce the emissions of internal combustion engines by developing technologies and strengthening environmental regulations in various countries around the world.

Air pollution is mainly due to the nitrogen oxide and particulate matter contained in the exhaust gas. Among them, the particulate matter is collected using a diesel particle filter, and the collected particulate matter is generally used. The combustion is carried out by the temperature of the exhaust gas and the catalytic action coated on the filter.

Here, the catalyst serves to help the exhaust gas to perform the combustion reaction at a lower temperature or to accelerate the combustion reaction more quickly. The exhaust gas has a difference in composition and properties depending on the fuel used in the internal combustion engine.

In particular, the most problematic in using a diesel particle filter is that the particulate matter accumulated on the filter gradually accumulates and the pores of the filter eventually become clogged so that the exhaust gas can no longer pass. Note is a problem regarding the purification of so-called diesel particle filters.

The particulate matter has a high reaction temperature to burn by catalytic reaction, but diesel engines using light oil as fuel pushes the cooled and compressed air into the combustion chamber to increase the output, thereby increasing the compression and explosion power. Excess air that is introduced into the exhaust gas is lowered temperature may cause a problem that does not reach the reaction temperature suitable for the catalytic reaction by the heat of the exhaust gas of the internal combustion engine.

 In order to solve such a problem, there is a need for an exhaust gas purifying apparatus capable of reaching an appropriate temperature for a catalytic reaction while periodically oxidizing particulate matter collected in front of a diesel particle filter.

Referring to the configuration of the conventional exhaust gas purification apparatus with reference to the example shown in FIG.

Fuel for assisting the supply of thermal energy is mixed with the exhaust gas from the engine 10 and then introduced into a diesel oxidation catalyst (DOC) 11, and in the diesel oxidation catalyst 11, The fuel is oxidized to generate thermal energy, providing a source of heat capable of purifying the diesel particle filter 12.

The diesel oxidation catalyst 11 burns fuel supplied for heating carbon monoxide, hydrocarbons, soluble organic substances in particulate matter, and diesel particle filters contained in exhaust gas.

The diesel particulate filter 12 is disposed in series at the rear end of the diesel oxidation catalyst 11 and serves to reduce particulate matter of the exhaust gas discharged finally by collecting particulate matter from the diesel engine in the filter. In addition, when the particulate matter is collected in the diesel particulate filter for a predetermined amount or more, the particulate matter is burned and purified by the diesel oxidation catalyst 11 as a separate thermal energy providing device.

However, this has a problem in that the oxidation process in the diesel oxidation catalyst is not smooth because of poor mixing with the exhaust gas.

In order to solve the above problem, as another conventional embodiment, as shown in FIG. 2, a small catalytic reactor is located in the exhaust pipe to partially oxidize a part of the fuel to independently operate the diesel according to the operating conditions of the vehicle. A system configuration capable of purifying the particle filter was proposed to supply fuel to the exhaust gas in a vaporized state to improve the mixing with the exhaust gas so that the oxidation process in the diesel oxidation catalyst can be smoothly performed (Application No. 10-2005- 0111482).

The conventional exhaust gas purification burner device shown in FIG. 2 includes a burner housing 21 filled with a combustion reforming catalyst to burn / reform exhaust gas; An air intake amount adjusting mechanism (23) mounted in the burner housing (21) to adjust the amount of exhaust gas flowing into the exhaust gas suction cone; An exhaust gas suction cone 22 for introducing exhaust gas into the catalytic reactor 25 at a rear end of the regulating mechanism 23; and an igniter 24 generating a flame at an upper end of the rear end of the suction cone 22; And a catalytic reactor (25) for reforming exhaust gas and fuel by a combustion reforming catalyst at the rear end of the igniter (24), which is installed integrally and discharged from the catalytic reactor (25) at the rear end of the catalytic reactor (25). A combustion catalyst plate 26 for combusting a portion of the mixed combustion reformed gas and the combustible material of the exhaust gas flowing between the catalytic reactor 25 and the burner housing 21; A fuel preheating line 27 connected from an outside of the burner housing 21 to supply fuel; And a mixer 28 installed at a rear end of the fuel preheating line 27 to mix combustion gas passing through the combustion catalyst and exhaust gas flowing between the catalytic reactor 25 and the burner housing 21. consist of.

In the burner device for exhaust gas purification illustrated in FIG. 2, the igniter 24 at the front end of the diesel particle filter has a structure in which an electric heater is used to heat the diesel particle filter. In order to operate the heater, a battery of a vehicle or an internal combustion engine is used, and thus, a lot of power is consumed according to the number of operating times of the heater, thereby shortening the battery capacity or reducing the life of the battery.

In addition, when the injection nozzle is used in the fuel preheating line 27 in front of the heater, it is important that the fuel injected from the nozzle becomes fine particles. However, the unburned fuel is adsorbed to the particulate matter generated in the internal combustion engine and is present in the soot state, thereby blocking the injection hole of the injection nozzle or curing the fuel by flowing from the nozzle after injection. Fuel that is not atomized leads to incomplete ignition or incomplete combustion resulting in secondary pollutants.

Therefore, the exhaust gas purification burner device has problems such as power consumption, nozzle clogging, and secondary pollution.

The present invention is invented to solve the above problems of the prior art,

Burner including a porous inhaler that has excellent durability to supply thermal energy and cleans the fuel to minimize vehicle clogging and nozzle contamination and secondary pollution to purify diesel particulate filters trapped with particulate matter generated from internal combustion engines. An object of the present invention is to provide a combustion method and a burner device for exhaust gas purification.

The combustion method of the exhaust gas purification burner of the diesel engine using the liquid fuel of the present invention for achieving the above object,

In order to supply high temperature thermal energy to the diesel particulate filter and the exhaust gas, the injected fuel is absorbed and then bubbled by the gas and ignited using the atomized fuel.

In addition, the burner device for exhaust gas purification of the present invention,

A burner housing 31 which maintains an appearance of the burner device; An introduction portion of the burner housing 31 may include supply pipes 33 and 34 for supplying fuel or gas for ignition connected from the outside, respectively, or integrally; A porous inhaler 32 of various shapes and materials having absorbing power for absorbing fuel at the rear end of the supply pipes 33 and 34 to ignite the fuel bubbled through the pores to form a flame; An igniter 35 installed in front of the porous inhaler to generate heat energy by igniting the fuel atomized in the porous inhaler; And a power supply unit 36 for supplying power to the igniter 35, the fuel pump and the air pump in the burner housing.

The present invention prevents the device which collects particulate matter in the exhaust gas generated in the process of using fossil fuel from being replaced or damaged due to the limit of the collection amount and enables the continuous use by regenerating the diesel particle filter even during use. Minimize the filter lifespan and minimize unnecessary replacement or repair costs.

In addition, by using the burner using the bubbling of the mixed fuel through the porous inhaler, the flame is stably maintained in the flow rate of the exhaust gas generated in the internal combustion engine, and the combustion heat is efficiently transferred to the exhaust gas and the diesel particle filter to It assists catalytic oxidation and can oxidize the particulate matter collected at high temperature to purify the particle filter.

In addition, since the porous inhaler is used instead of the general spray nozzle, there is an effect of preventing the nozzle clogging.

1 is a configuration diagram of a diesel particle filter heating system by a fuel injection of the prior art,
2 is a cross-sectional view of a conventional exhaust gas heating device
3 is a cross-sectional view of an exhaust gas heating apparatus according to Embodiment 1 of the present invention;
Figure 4 is the shape of the flame according to the size of the pores in the porous inhaler.

Hereinafter, a configuration and an operation of a combustion method of a burner using a liquid fuel and an embodiment of the burner device for exhaust gas purification using the same according to the present invention will be described in detail with reference to the accompanying drawings.

The core of the present invention is to provide a combustion method of a burner using a liquid fuel and a burner device for exhaust gas purification of a diesel engine using the same, and to more stably supply a mixed fuel supplied to an igniter in a conventional exhaust gas purification device. It is a combustion method and a combustion device of an exhaust gas purifying burner equipped with a porous inhaler in order to improve efficiency in regenerative and electric power and to prevent nozzle clogging.

3 is a block diagram of a burner device for purifying exhaust gas according to an exemplary embodiment of the present invention, wherein a burner housing 31, a porous inhaler 32, a fuel supply pipe 33, a gas supply pipe 34, It consists of an igniter 35 and a power supply 36.

The burner housing 31 guides the heat energy generated by the igniter 35 to be stably transmitted to the exhaust gas and the diesel particle filter, and forms a main body of the burner device for exhaust gas purification.

The fuel supply pipe 33 supplies a fuel for ignition from the outside of the burner housing 31 and the gas supply pipe 34 supplies a gas for bubbling fuel.

The fuel supply pipe 33 and the gas supply pipe 34 are separately or integrally installed in the burner housing 100 to supply fuel and gas to the porous inhaler 32.

When the fuel supply pipe 33 and the gas supply pipe 34 are present separately, the fuel supply pipe 33 is located at the top of the gas supply pipe 34 and is located closer to the porous inhaler 32 than the gas supply pipe 34. As shown in FIG. 3, fuel is spread in a porous inhaler to inject gas in an adsorbed state to form more improved bubbling.

The igniter 35 is located at the rear end of the porous inhaler 32 to generate thermal energy for regeneration of the diesel particle filter. The temperature required to ignite the fuel injected from the fuel supply pipe 33 by the electric heater method using the spark between the two electrodes connected from the power supply unit 36 is required.

The porous inhaler 32 adsorbs the fuel injected from the fuel supply pipe 33 and bubbles the fuel by the gas to form fine particles to form a stable and improved flame.

The porous inhaler 32 may have a shape of a plate, honeycomb, polygon, streamlined structure. Among them, the plate shape according to the shape of the burner housing 31 is preferable due to a space problem.

The porous inhaler 32 changes the amount of thermal energy at the time of ignition according to the size of the particles and the degree of spread of the fuel by bubbling the fuel injected from the nozzle and converting the particles into more particulate forms. The efficiency of the regeneration and the improvement of power consumption, and the degree of prevention of nozzle clogging are changed.

Therefore, when the fuel is spread and bubbled in the porous inhaler 32, the degree of spread of the fuel and the size of the particles vary slightly depending on the surface tension of the fuel and the amount of gas, but the surface tension of the fuel depends on the type of fuel. The amount of gas controlled depends on the material of the porous inhaler.

When light oil is ignited, radiant heat and conduction heat of flame affect the porous inhaler 32, so the material that can be used at high temperature is selected. In addition to having toughness and porosity for heat or absorbing fuel by surface tension and capillary phenomenon of fuel, Adsorption-type materials can be used.

The power supply unit 36 supplies power to the electrodes of the igniter 35 from the battery of the vehicle.

FIG. 4 (a) shows a state in which fuel flows to the porous inhaler when the pore size is 1 μm, and FIG. 4 (b) shows a state in which fuel flows to the porous inhaler when the pore size is 10 μm. 4 (c) shows a state in which fuel flows through the porous inhaler when the pore size is 100 μm.

As shown in (a), (b), and (c) of FIG. 4, when the pore size increases in the porous inhaler 32, fuel flows faster through the surface of the porous inhaler 32 so that flames are generated for each pore. If the bubble is formed downward and the area is reduced, the length of the flame is increased when the bubble is bubbled with the same amount of gas and the area of the flame is narrowed as a whole so that the flame cannot be formed at the center of the porous inhaler.

In the present specification, a combustion method of a burner using a liquid fuel including a porous inhaler 32 according to the present invention and a preferred embodiment of a burner device for exhaust gas purification of a diesel engine using the same have been described, but the present invention is not limited thereto. . The invention may be practiced in various ways within the scope of the claims and the accompanying drawings, which also belong to the scope of the invention.

31 Burner Housing 32 Porous Aspirator
33 Fuel Supply Line 34 Gas Supply Line
35 Igniter 36 Power Section

Claims (6)

In the burner apparatus used to supply heat energy in an exhaust pipe for regenerating a diesel particle filter,
A burner housing 31 which maintains an appearance of the burner device;
An inlet of the burner housing 31 has a fuel supply pipe 33 for supplying a liquid fuel for ignition from the outside;
A gas supply pipe 34 for supplying a gas to an inlet of the burner housing 31 from outside to bubble the liquid fuel adsorbed to the porous inhaler 32;
It includes a plurality of pores therein so that the liquid fuel supplied from the fuel supply pipe 33 is adsorbed, and when the gas supplied from the gas supply pipe 34 passes through the pores, the liquid fuel is bubbled into particles. Porous inhaler 32;
An igniter 35 installed at a rear end of the porous inhaler 32 to ignite the liquid fuel atomized in the porous inhaler 32 to generate thermal energy;
And a power supply unit (36) for supplying power to the igniter (35), the fuel pump and the air pump in the burner housing (31). The method of claim 1,
The fuel supply pipe (33) and the gas supply pipe 34 is integrally coupled to the exhaust gas purification burner device, characterized in that the liquid fuel and gas is supplied through one supply pipe. The method according to claim 1 or 2,
The gas supplied into the gas supply pipe (34) is an exhaust gas purification burner device, characterized in that using air, flammable gas or flammable gas. The method of claim 1,
The porous inhaler 32 has a shape of the exhaust gas purification burner device, characterized in that consisting of a plate, honeycomb, polygonal or streamlined structure. The method of claim 1, wherein
The porous inhaler 32, the material of the exhaust gas purification burner device, characterized in that the ceramic, glass or metal material. In the combustion method of the exhaust gas purification burner used to supply heat energy in the exhaust pipe for regenerating the diesel particle filter,
In order to supply high temperature heat energy to the diesel particulate filter and exhaust gas, the liquid fuel is supplied to the front end of the porous inhaler 32, and the porous fuel is porous by the gas passing through the pores among the supplied gas after the liquid fuel is absorbed. A method of combustion of an exhaust gas purifying burner in which a liquid fuel is bubbled to the rear end of the inhaler 32 to be atomized, and then the atomized liquid fuel is ignited to radiate the burned flame to a diesel particle filter and exhaust gas.

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