KR100866327B1 - Plasma burner and diesel particulate filter trap - Google Patents

Abstract

A PLASMA BURNER AND DIESEL PARTICULATE FILTER TRAP are provided to maximize the space utilization around the exhaust pipe and reduce effectively particulate within the exhaust gas. A diesel particulate filter trap comprises a filter(8) connecting to an exhaust pipe on the opposite side of an engine(2); and a plasma burner(100), installed within the exhaust pipe between the engine and the filter, heating the exhaust gas using plasma discharge. The plasma burner comprises a fuel inlet(22) feeding fuel; a fuel inlet(24) taking in air while spraying the fuel feeding through the fuel inlet; a discharge air inlet port(26) feeding the discharge air into the mixture gas of fuel and air; a flame jet(28) jetting flame created by plasma discharge of the mixture gas according to the flow of discharge air; a fuel feeding pipe(12) connecting the fuel inlet and the fuel tank each other; a jet air inlet port(14) connected to the jet air inlet port; and a discharge air inflow pipe(16) connected to the jet air inlet port.

Description

Plasma Burner & Soot Filter {PLASMA BURNER AND DIESEL PARTICULATE FILTER TRAP}

The present invention relates to a plasma burner and a soot filtration device, and more particularly, to a plasma burner and a soot filtration device for effectively oxidizing and removing particulate matter (PM) in exhaust gas by preheating the reactor body and fuel. will be.

The present invention relates to a plasma burner and a soot filtration apparatus for installing and preheating a plasma burner in an exhaust pipe, thereby effectively oxidizing and removing particulate matter in the exhaust gas and maximizing a space arrangement around the exhaust pipe.

Particulate matter in automobile exhaust is mainly emitted from diesel engines. The diesel engine adjusts the power by the ratio of air and fuel, and increases the amount of fuel supplied to a certain amount of air in order to produce a high power momentarily. At this time, some of the fuel is incompletely burned due to the lack of air volume to generate a large amount of soot.

In addition, when the diesel engine is combusted, the high pressure injection period of the fuel is short, so that a rich region is generated locally in the combustion chamber, thus generating a large amount of soot.

A soot filtration device (DPF) collects particulate matter discharged from a diesel engine in a filter and oxidizes particulate matter, and can reduce particulate matter by 80% or more. By collecting and oxidizing particulate matter, a technique for regenerating and extending the life of filters and soot filtration devices for collecting particulate matter is important.

The soot filtration device has a forced regeneration method forcibly oxidizing the particulate matter collected during the regeneration process. The forced regeneration method is a forced heating method using an electric heater, a burner, and throttling. Cars that operate mainly in urban areas partially apply forced regeneration because they maintain low emissions.

In the forced regeneration method, the electric heater has a disadvantage of large power consumption. Since the burner uses oxygen in the exhaust gas, it is difficult to control the operation according to the oxygen conditions in the exhaust gas that vary depending on the operating state. Throttling lowers the oxidation temperature of particulate matter in the oxidation catalyst but has the disadvantage of attaching a device for throttling to the intake and exhaust pipes.

The present invention provides a plasma burner and a soot filtration device which preheats the reactor body and fuel, thereby effectively oxidizing and removing particulate matter in exhaust gas.

The present invention provides a plasma burner and a soot filtration device that effectively installs and preheats a plasma burner in an exhaust pipe, thereby effectively oxidizing and removing particulate matter in the exhaust gas and maximizing the space arrangement around the exhaust pipe.

A soot filtration device according to an embodiment of the present invention includes a filter connected to an exhaust pipe on an opposite side of an engine, a plasma burner installed in the exhaust pipe between the engine and the filter to heat exhaust gas using plasma discharge, The plasma burner includes a fuel inlet for supplying fuel, an injection air inlet for introducing air for injecting fuel into the fuel inlet, a discharge air inlet for supplying discharge air to a mixture of the fuel and air, and the discharge air A fuel inlet pipe for ejecting the flame by the plasma discharge of the mixed gas in accordance with the flow of the fuel inlet pipe connecting the fuel inlet and the fuel tank with each other, the injection air inlet pipe connected to the injection air inlet, and the It may include a discharge air inlet pipe connected to the discharge air inlet.

The plasma burner includes a base including a mixing chamber for forming the fuel inlet, the injection air inlet, and the discharge air inlet, the base being interposed with an insulator, and having an endothermic chamber therein, the fuel inlet And an electrode for mixing and heating fuel and air flowing from the injection air inlet in a mixed gas state in the endothermic chamber, and embedding the electrode to be spaced apart from an inner wall, and forming a flame outlet on the opposite side of the base to connect to the base. And a mixture gas supplied through a mixer injection hole connected to the mixing chamber, and including a reaction furnace for ejecting a flame formed by the mixture gas into the flame outlet through plasma discharge between the electrode and the inner wall.

The mixer injection holes may be formed in plural and are disposed at equal intervals along the circumferential direction in the reactor, and may be inclined at a predetermined angle with respect to the center direction of the cylinder.

The base may have a curved surface that is convex opposite to the electrode.

The injection air inlet pipe is connected to an endothermic chamber formed at the center of the electrode, and the fuel inlet pipe is installed in the injection air inlet pipe and connected to the endothermic chamber, and the discharge air inlet pipe is the It can be connected to the mixing chamber.

The electrode may include a mounting portion mounted to the insulator, and the endothermic chamber may have a shape that extends from the mounting portion to form a maximum expansion portion and then gradually narrows.

The mounting part may include a first passage coupled to the injection air inlet pipe, and a second passage formed on an outer circumference of the first passage to connect the endothermic chamber to the mixing chamber.

The electrode may further include a third passage that directly connects the endothermic chamber to the inside of the reactor.

In addition, the soot filtration device according to an embodiment of the present invention may further include a cowl disposed in front of the reactor to increase the stability of the flame.

In addition, the soot filtration device according to an embodiment of the present invention may further include a fuel injection nozzle disposed in front of the cowl to inject fuel into the flame.

In addition, the soot filtration device according to an embodiment of the present invention may further include a flow disturbance member provided around the flame outlet.

The flow disturbing member may be formed to protrude on the outer periphery of the reactor from the flame outlet.

The flow disturbing member may be spaced apart in front of the flame outlet.

The flow disturbing member may be formed in a circular band state having an inner diameter larger than that of the flame jet.

The flow disturbing member may be disposed to correspond to the center of the flame jet in front of the flame jet.

In addition, the particulate filter according to an embodiment of the present invention may further include a heat exchanger installed on the fuel inlet pipe, the injection air inlet pipe and the discharge air inlet pipe at least one of the pipeline.

In addition, the particulate filter according to an embodiment of the present invention may further include an oxidation catalyst mounted on the front of the filter.

In addition, the plasma burner according to an embodiment of the present invention includes a fuel inlet, an injection air inlet, a discharge air inlet and a flame outlet, respectively formed on one side, and a mixing chamber formed therein, wherein one side is formed with a convex curved surface. A base, an electrode mounted to the base via an insulator, and having an endothermic chamber therein, the electrode for mixing and heating fuel and air introduced from the fuel inlet and the injection air inlet in a mixed gas state in the endothermic chamber; And a built-in electrode spaced apart from the inner wall, connected to the base by forming a flame outlet on the opposite side of the base, and mixed through a mixer injection hole connected to the mixing chamber by a flow of discharge air flowing into the discharge air inlet. Gas is supplied, and the plasma is discharged between the electrode and the inner wall. The sum can be of the flame formed by the gas contained in the reaction for ejecting the flame jet port.

In addition, the plasma burner according to an embodiment of the present invention may further include a cowl disposed in front of the reactor to collect the flame.

In addition, the plasma burner according to an embodiment of the present invention may further include a fuel injection nozzle disposed in front of the cowl to inject fuel into the flame.

In addition, the plasma burner according to an embodiment of the present invention may further include a flow disturbing member provided around the flame outlet.

As described above, according to the present invention, the fuel and the discharge air are mixed and preheated to generate a flame by plasma discharge, thereby effectively oxidizing and removing particulate matter in the exhaust gas.

Plasma burners are also installed in the exhaust pipe to maximize space layout around the exhaust pipe.

The flow disturbing member can stabilize the flame by disturbing the exhaust gas flow around the flame outlet of the reactor.

The fuel injection nozzle is sprayed in front of the flame to further expand the flame, thereby more effectively oxidizing and removing particulate matter.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a block diagram of a soot filtration device according to an embodiment of the present invention. Referring to FIG. 1, a soot filtration apparatus is a device for collecting and oxidizing particulate matter contained in exhaust gas discharged through an exhaust pipe 4 connected to an engine 2.

The particulate filter promotes oxidation of an oxidation catalyst (6) which primarily oxidizes particulate matter, a filter (8) which collects the remaining particulate matter passing through the oxidation catalyst (6), and particulate matter trapped in the filter (8). It includes a plasma burner (100).

The oxidation catalyst 6 is disposed in front of the filter 8 in the exhaust pipe 4 to primarily oxidize particulate matter contained in the exhaust gas via the exhaust pipe 4, and the exhaust gas is at a temperature lower than the oxidation condition. When the low temperature exhaust gas is heated through the plasma burner 100, the particulate matter collected in the filter 8 is additionally oxidized.

The filter 8 is connected to the exhaust pipe 4 on the opposite side of the engine 2 and collects particulate matter contained in the exhaust gas while passing the exhaust gas via the exhaust pipe 4. The filter 8 is disposed behind the oxidation catalyst 6 to collect particulate matter contained in the exhaust gas which is primarily oxidized by the oxidation catalyst 6.

The plasma burner 100 injects fuel into itself and reforms it into a pre-oxide having a main component of hydrogen and carbon monoxide, and burns fuel to eject flames to heat the exhaust gas while directly oxidizing particulate matter.

For example, the soot filtration apparatus includes a fuel inlet pipe 12, a sprayed air inlet pipe 14, and a discharge air inlet pipe 16 for supplying fuel, injection air, and discharge air to the plasma burner 100, respectively. .

The plasma burner 100 is installed in the exhaust pipe 4 between the engine 2 and the filter 8. The plasma burner 100 includes a fuel inlet 22, an injection air inlet 24, a discharge air inlet 26, and a flame outlet 28 so as to be applied to a soot filtration device.

The fuel inlet pipe 12 connects the fuel inlet 22 and the fuel tank 30 to introduce fuel into the plasma burner 100. The injection air inlet pipe 14 connects the injection air inlet 24 to the outside of the exhaust pipe 4 to introduce external air into the plasma burner 100. The injection air flowing into the injection air inlet pipe 16 and the injection air inlet port 24 injects the fuel introduced into the fuel inlet pipe 12 and the fuel inlet port 22 into the plasma burner 100.

The discharge air inlet pipe 16 connects the discharge air inlet 26 to the outside of the exhaust pipe 4 to introduce external air into the plasma burner 100. The discharge air flowing into the discharge air inlet 16 and the discharge air inlet 26 ejects a flame formed by plasma discharge generated from a mixture of fuel and air to the flame outlet 28.

FIG. 2 is an exploded perspective view of a plasma burner according to a first embodiment of the present invention applied to FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III of FIG.

2 and 3, the plasma burner 100 includes a base 40, an electrode 50, and a reactor 60.

The base 40 forms a fuel inlet 22, an injection air inlet 24, and a discharge air inlet 26, and includes a mixing chamber 42 formed therein. Since the plasma burner 100 is installed in the exhaust pipe 4, in order to minimize the disturbance of the exhaust gas, the plasma burner 100 is formed in a structure that minimizes the resistance to the exhaust gas flow.

For example, the base 40 has a curved surface that is convex toward the engine 2 side (the opposite side of the electrode). The exhaust gas flowing from the engine 2 side to the filter 8 side may be guided to the filter 8 side with minimal resistance by the convex curved surface of the base 40.

The electrode 50 includes a mounting portion 54 mounted to the base 40 via an insulator 52, and an endothermic chamber 56 formed therein extending to the mounting portion 54.

The fuel and air introduced from the fuel inlet 22 and the injection air inlet 24 of the base 40, respectively, flow into the endothermic chamber 56, are mixed in a mixed gas state, and heated. The insulator 52 electrically insulates the electrode 50 from the base 40 or the reactor 60.

The electrode 50 has a shape that expands on the opposite side of the base 40 of the mounting portion 54 to form a maximum extension and then gradually narrows. That is, the endothermic chamber 56 has a substantially conical shape.

The mounting portion 54 forms a double passage by a double tube, and includes a first passage 154 formed inside and a second passage 254 formed outside the first passage 154. The injection air inlet pipe 14 is coupled to the first passage 154. The endothermic chamber 56 and the mixing chamber 42 are connected to the second passage 254.

The injection air inlet pipe 14 is connected to the endothermic chamber 56 formed at the center of the electrode 50 through the first passage 154. The fuel inlet pipe 12 is installed inside the injection air inlet pipe 14 and is connected to the endothermic chamber 56.

The fuel supplied to the fuel inlet pipe 12 is supplied to one side of the endothermic chamber 56, and at the end of the fuel inlet pipe 12, the fuel is supplied into the endothermic chamber 56 by the injection air supplied to the injection air inlet pipe 14. Sprayed in mixed gas state.

The mixed gas heated in the endothermic chamber 56 is supplied to the mixing chamber 42 formed in the base 40 through the second passage 254.

The discharge air inlet pipe 16 is connected to the mixing chamber 42. The discharged air supplied to the discharge air inlet pipe 16 injects the mixed gas in the mixing chamber 42 into the reactor 60 through the mixer injection port 66.

The reactor 60 is connected to the base 40 by embedding the electrode 50, and forms a flame outlet 28 on the opposite side of the base 40. The inner wall of the reactor 60 keeps spaced apart from the electrode 50.

The distance between the inner wall of the reactor 60 and the electrode 50 gradually increases by the shape in which the reactor 60 is cylindrical and the electrode 50 gradually narrows. That is, the distance between the outer surface of the electrode 50 and the inner wall of the reactor 60 at the endothermic chamber 56 forms the shortest distance at the largest extension and gradually forms a long distance as the electrode 50 narrows.

For example, the reactor 60 and the base 40 are arranged in a straight line along the longitudinal direction of the exhaust pipe 4, and the electrode 50 is built in by welding or bolting the outer sides facing each other. Connected to a state.

The reactor 60 is connected to the mixing chamber 42 formed in the base 40 through the mixer injection port 66 provided on the side, and receives the mixed gas from the mixing chamber 42.

Since a predetermined voltage V is applied to the electrode 50 and the reactor 60 is grounded, plasma discharge occurs between the spaced electrode 50 and the inner wall of the reactor 60. That is, according to the gradual change in the distance formed between the outer surface of the electrode 50 and the inner wall of the reactor 60, the plasma discharge generated between both is extended along the extended distance.

Plasma discharge between the electrode 50 and the reactor 60 is generated in the narrow distance between the electrode 50 and the reactor 60 is diffused to a wider portion and then extinguished, and again in the narrow portion The process of spreading to a wider part and then disappearing is repeated.

The plasma discharge of the mixed gas of fuel and air is reformed into a preoxide containing hydrogen and carbon monoxide, thereby facilitating oxidation in the oxidation catalyst 6.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

Referring to FIG. 4, a plurality of mixer injection holes 66 are formed and disposed at equal intervals along the circumferential direction in the reactor 60, and are inclined at a predetermined angle with respect to the center direction of the cylinder.

The mixed gas flowing into the reactor 60 from the mixing chamber 42 through the mixer injection port 66 forms a swirl in the reactor 60 according to the guide of the mixer injection port 66.

The mixer injection holes 66 arranged at a plurality of equal intervals form a uniform rotational flow along the circumferential direction in the reactor 60, so that the space inside the reactor 60 can be efficiently utilized.

Plasma discharge generated between the electrode 50 and the reactor 60 forms a flame by the rotational flow of the mixed gas which is guided through the mixer injection port 66, the flame through the flame ejection opening 28 60 is blown out to the exhaust pipe (4). The flame heats the exhaust gases while directly oxidizing particulate matter.

Hereinafter, the second to eighth embodiments illustrated in FIGS. 5 to 11 add additional components to the first embodiment, and descriptions of similar or identical parts to each other are omitted in comparison with the first embodiment. And explain the different parts.

5 is a cross-sectional view of the plasma burner according to the second embodiment of the present invention.

Referring to FIG. 5, the plasma burner 100 further includes a cowl 71. The cowl 71 is disposed in front of the reactor 60 to guide the ejection of the flame ejected from the flame outlet 28, resulting in a sudden mixing of the ejected flame with the exhaust gas outside the reactor 60. This can be prevented from becoming unstable. The cowl 71 may be installed on the outer wall of the reactor 60 through the connection member 72.

6 is a cross-sectional view of a plasma burner according to a third embodiment of the present invention.

Referring to FIG. 6, the plasma burner 100 further includes a fuel injection nozzle 73 in front of the cowl 71. The fuel injection nozzle 73 is connected to the fuel tank 30 to receive fuel, and is disposed in front of the cowl 71 to inject fuel into the flame guided through the cowl 71.

The fuel injected into the flame may be burned to form additional flames to further heat the exhaust gas while burning particulate matter contained in the exhaust gas.

7 to 9 are cross-sectional views of the plasma burners according to the fourth to sixth embodiments of the present invention.

7 to 9, the plasma burner 100 further includes flow disturbance members 174, 274, and 374 around the flame outlet 28 of the reactor 60. The flow disturbing members 174, 274, and 374 may be formed differently from FIGS. 7 to 9.

Referring to FIG. 7, the flow disturbance member 174 protrudes from the flame outlet 28 at the outer circumference of the reactor 60. The flow disturbing member 174 generates a flow in the exhaust gas flowing between the outer circumferential surface of the reactor 60 and the exhaust pipe 4 to collect and stabilize the flame ejected to the flame outlet 28.

Referring to Figure 8, the flow disturbing member 274 is spaced apart in front of the flame outlet (28). The flow disturbing member 274 may be formed as a circular band having an inner diameter larger than the inner diameter of the flame ejection opening 28. The flow disturbing member 274 may be installed in front of the reactor 60 through the connecting member 75. The flow disturbing member 274 is discharged from the flame ejection opening 28 and proceeds by a predetermined distance to collect and stabilize the flame to be spread again.

Referring to FIG. 9, the flow disturbing member 374 is disposed corresponding to the center of the flame ejection opening 28 in front of the flame ejection opening 28. The flow disturbing member 374 may be formed in a disc and installed at the front of the reactor 60 through the connecting member 76. The flow disturbing member 374 of FIG. 8 illustrates a structure in which the flame is spread and then collected again unlike the first to third embodiments.

10 is a sectional view of a plasma burner according to a seventh embodiment of the present invention.

Referring to FIG. 10, the fuel inlet pipe 12, the injection air inlet pipe 14, and the discharge air inlet pipe 16 include heat exchangers 32, 34, and 36, respectively.

For example, the heat exchanger 32 of the fuel inlet pipe 12 is formed in a coil shape to increase the endothermic area in the exhaust pipe 4 to heat the fuel supplied to the fuel inlet pipe 12.

The heat exchanger 34 of the injection air inlet pipe 14 is formed in a coil shape to increase the endothermic area in the exhaust pipe 4 to heat the injection air supplied to the injection air inlet pipe 14.

The heat exchanger 36 of the discharge air inlet pipe 16 is formed in a coil shape to increase the endothermic area in the exhaust pipe 4 to heat the fuel supplied to the discharge air inlet pipe 16.

The heat exchangers 32, 34, 36 may be installed in both the fuel inlet pipe 12, the injection air inlet pipe 14 and the discharge air inlet pipe 16 (see FIG. 10) and are formed in one or two locations. It may be (not shown).

In addition, the seventh embodiment shows that the heat exchangers 32, 34, 36 are installed in the second embodiment, and the first embodiment, the third embodiment, the sixth embodiment, and the eighth embodiment. The same can be applied to.

11 is a sectional view of a plasma burner according to an eighth embodiment of the present invention.

Referring to FIG. 11, the electrode 50 further includes a third passage 354 formed therethrough. The third passage 354 directly connects the endothermic chamber 56 to the inside of the reactor 60. That is, the third passage 354 is a reactor 60 when the majority of the mixed gas passes through the second passage 254, the mixing chamber 42 and the mixer injection port 66, the mixed gas in the endothermic chamber 56, 60 Direct injection). Accordingly, the third passage 354 enables the supply of a large amount of fuel through the fuel supply pipe 12.

In addition, the eighth embodiment illustrates that the third passage 354 is formed in the first embodiment, and the same can be applied to the second to seventh embodiments.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

1 is a block diagram of a soot filtration device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a plasma burner according to a first embodiment of the present invention applied to FIG. 1.

3 is a cross-sectional view taken along line III-III of FIG. 2.

4 is a cross-sectional view taken along the line IV-IV of FIG. 3.

5 is a cross-sectional view of the plasma burner according to the second embodiment of the present invention.

6 is a cross-sectional view of a plasma burner according to a third embodiment of the present invention.

7 is a sectional view of a plasma burner according to a fourth embodiment of the present invention.

8 is a sectional view of a plasma burner according to a fifth embodiment of the present invention.

9 is a sectional view of a plasma burner according to a sixth embodiment of the present invention.

10 is a sectional view of a plasma burner according to a seventh embodiment of the present invention.

11 is a sectional view of a plasma burner according to an eighth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

2: engine 4: exhaust pipe

6: oxidation catalyst 8: filter

100: plasma burner 12: fuel inlet pipe

14: injection air inlet pipe 16: discharge air inlet pipe

22: fuel inlet 24: injection air inlet

26: discharge air inlet 28: flame outlet

30: fuel tank 40: base

50 electrode 60 reactor

52: insulator 54: mounting portion

56: endothermic chamber 154, 254: first, second passage

42: mixing chamber 354: third passage

66: mixer nozzle 71: cowl (cowl)

72, 75, 76: connecting member 73: fuel injection nozzle

174, 274, 374: flow disturbance members 32, 34, 36: heat exchanger

Claims (33)

A filter connected to the exhaust pipe on the opposite side of the engine; A plasma burner installed between the engine and the filter in the exhaust pipe to heat exhaust gas by using plasma discharge; The plasma burner, Fuel inlet to fuel, Injection air inlet for injecting air to inject the fuel flowing into the fuel inlet, A discharge air inlet for supplying discharge air to the mixed gas of fuel and air, and It includes a flame ejection outlet for ejecting a flame by the plasma discharge of the mixed gas in accordance with the flow of the discharge air, A fuel inlet pipe connecting the fuel inlet and the fuel tank to each other; An injection air inlet pipe connected to the injection air inlet; And A soot filtration device comprising a discharge air inlet pipe connected to the discharge air inlet. According to claim 1, The plasma burner, A base including a mixing chamber defining the fuel inlet port, the injection air inlet port, and the discharge air inlet port; An electrode mounted to the base via an insulator and having an endothermic chamber therein, the electrode for mixing and heating fuel and air introduced from the fuel inlet and the injection air inlet in a mixed gas state in the endothermic chamber; And The electrode is spaced apart from the inner wall, and a flame outlet is formed on the opposite side of the base to be connected to the base and supplied with a mixed gas through a mixer injection hole connected to the mixing chamber, and a plasma discharge is formed between the electrode and the inner wall. A soot filtration device comprising a reactor for ejecting the flame formed by the mixed gas into the flame outlet. The method of claim 2, The mixer injection port, Is formed in plural and arranged at equal intervals along the circumferential direction in the reactor, A soot filtration device which is formed to be inclined at a predetermined angle with respect to the center direction of the cylinder. The method of claim 2, The base is, A soot filtration device having a convex curved surface opposite the electrode. The method of claim 2, The injection air inlet pipe is connected to an endothermic chamber formed at the center of the electrode, The fuel inlet pipe is installed in the injection air inlet pipe and connected to the endothermic chamber, The discharge air inlet pipe, the soot filtration device connected to the mixing chamber. The method of claim 2, The electrode, It includes a mounting portion mounted to the insulator, The endothermic chamber, A soot filtration device having a shape extending from the mounting portion to form a maximum expansion portion and then gradually narrowing. The method of claim 6, The mounting portion, A first passage coupled to the injection air inlet pipe; And a second passage formed at an outer circumference of the first passage to connect the endothermic chamber to the mixing chamber. The method of claim 6, The electrode, And a third passage connecting the endothermic chamber directly to the inside of the reactor. The method of claim 2, A soot filtration device further comprising a cowl disposed in front of the reactor to collect the flames. The method of claim 9, And a fuel injection nozzle disposed in front of the cowl to inject fuel into the flame. The method of claim 2, A soot filtration device further comprising a flow disturbing member provided around the flame outlet. The method of claim 11, wherein The flow disturbing member, A soot filtration device protruding from the flame outlet on the outer circumference of the reactor. The method of claim 12, The flow disturbing member, A soot filtration device spaced apart in front of the flame outlet. The method of claim 13, The flow disturbing member, A soot filtration device is formed in a circular band state having an inner diameter larger than the inner diameter of the flame outlet. The method of claim 13, The flow disturbing member, A soot filtration device which is disposed in correspondence to the center of the flame outlet in front of the flame outlet. According to claim 1, At least one of the fuel inlet pipe, the injection air inlet pipe and the discharge air inlet pipe further comprises a heat exchanger is installed on the conduit. According to claim 1, A soot filtration device further comprising an oxidation catalyst mounted in front of the filter. A base including a fuel inlet, an injection air inlet, a discharge air inlet, and a flame outlet formed on one side, and a mixing chamber formed therein, the one side having a convex curved surface; An electrode mounted to the base via an insulator and having an endothermic chamber therein, the electrode for mixing and heating fuel and air introduced from the fuel inlet and the injection air inlet in a mixed gas state in the endothermic chamber; And The electrode is spaced apart from the inner wall, and a flame outlet is formed on the opposite side of the base and connected to the base. And a reaction furnace configured to eject a flame formed by the mixed gas into the flame jet through a plasma discharge between the electrode and the inner wall. The method of claim 18, The mixer injection port, Plasma burners are formed in plural and are arranged at equal intervals along the circumferential direction in the reactor. The method of claim 18, The mixer injection port, Plasma burner is inclined at a predetermined angle with respect to the center direction of the cylinder. The method of claim 18, The convex surface is, And a plasma burner formed at the base opposite the electrode. The method of claim 18, The injection air inlet is connected to an endothermic chamber formed at the center of the electrode, The fuel inlet is connected to the endothermic chamber through a fuel inlet pipe installed inside the injection air inlet pipe connected to the injection air inlet, The discharge air inlet, the plasma burner is connected to the mixing chamber. The method of claim 18, The electrode, It includes a mounting portion mounted to the insulator, The endothermic chamber, And a plasma burner extending from the mounting portion to form a maximum expansion portion and then gradually narrowing. The method of claim 23, wherein The mounting portion, A first passage coupled to the injection air inlet pipe; And a second passage formed at an outer circumference of the first passage to connect the endothermic chamber to the mixing chamber. The method of claim 23, wherein The electrode, And a third passage connecting the endothermic chamber directly to the inside of the reactor. The method of claim 18, The reactor is grounded, A plasma burner in which a predetermined voltage is applied to the electrode. The method of claim 18, And a cowl disposed in front of the reactor to collect the flames. The method of claim 27, And a fuel injection nozzle disposed in front of the cowl to inject fuel into the flame. The method of claim 18, Plasma burner further comprising a flow disturbance member provided around the flame outlet. The method of claim 29, The flow disturbing member, Plasma burner protruding from the flame discharge port in the outer circumference of the reactor. The method of claim 29, The flow disturbing member, Plasma burners spaced apart in front of the flame outlet. The method of claim 31, wherein The flow disturbing member, Plasma burner is formed of a circular band having an inner diameter larger than the inner diameter of the flame ejection opening. The method of claim 31, wherein The flow disturbing member, And a plasma burner disposed corresponding to the center of the flame outlet in front of the flame outlet.

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