JP2003049628A - Purifying device of exhaust gas material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase removing capacity of material in exhaust gas, to sufficiently remove the material, and to contribute to improvement of environment in a purifying device of the exhaust gas material, by removing the material in the exhaust gas discharged from a burning appliance by combusting it at a low temperature by an oxidation catalyst action in a combustion type material removing part and by supplying electric power between a dust collection pole and a discharge pole in an electric collection type material removing part. SOLUTION: The midway of an exhaust system channel for passing the exhaust gas discharged from the burning appliance is provided with the combustion type material removing part having a cloth type filter element for removing the material in the exhaust gas by combusting it at the low temperature by the oxidation catalyst action. The electric collection type material removing part removes the material in the exhaust gas by supplying the electric power between the dust collection pole and the discharge pole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for purifying exhaust gas substances, and more particularly to a device for purifying exhaust gas substances that removes substances in exhaust gas generated in a combustor machine.

[0002]

2. Description of the Related Art Engines for vehicles, engines for heavy construction machinery,
Some combustor machines such as generator engines use gasoline as fuel and light oil as fuel, and the driving force is taken out by burning this fuel. The exhaust gas generated by burning this fuel contains harmful substances such as nitrogen oxides (NOx) that damage the environment if it is directly discharged to the atmosphere.
A purification device provided with a catalytic converter and the like is provided in the middle of the exhaust system passage of the combustor so as to purify the exhaust gas.

Exhaust gas regulations tend to be tightened in vehicles equipped with diesel engines that use light oil as fuel, and it is necessary to install a purification device for removing substances such as graphite and particles contained in exhaust gas. There is.

[0004]

However, conventionally, in the purification device for removing the substance in the exhaust gas, only a single device such as a catalytic converter is provided, and the ability of removing the substance is low. It is difficult to sufficiently remove the substances in the exhaust gas, and improvement has been desired.

[0005]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides a catalyst for oxidizing a substance in exhaust gas in the middle of an exhaust system passage through which exhaust gas discharged from a combustor machine flows. Providing a combustion-type substance removal unit equipped with a woven filter element that burns and removes it at a low temperature by the action, and also supplies an electric force between the dust collection electrode and the discharge electrode for the substance in the exhaust gas. It is characterized in that an electrostatic precipitating substance removing section for removing by means is provided.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, a substance in exhaust gas discharged from a combustor is burned and removed at a low temperature by an oxidation catalytic action in a combustion type substance removing section, and an electrostatic precipitating type substance is also removed. Since it is removed by supplying an electric force between the dust collection electrode and the discharge electrode in the removal part, the ability to remove substances in the exhaust gas is enhanced, and the substances are sufficiently removed, contributing to the improvement of the environment. can do.

[0007]

Embodiments of the present invention will be described in detail and specifically with reference to the drawings. 1 and 2 show a first embodiment of the present invention. In FIG. 1, reference numeral 2 is a purifying device that removes substances in exhaust gas from a combustor unit (not shown). The purifying device 2 is provided in the middle of an exhaust system passage 4 through which exhaust gas discharged from a combustor unit flows, and includes a combustion type substance removing section 6 and an electrostatic precipitating type substance removing section 8.

In the combustion type substance removing portion 6, for example, two first first members are arranged in the cylindrical housing 10 having an elliptical cross-section and are vertically spaced apart by a predetermined distance and are oriented in the longitudinal direction of the housing 10. , Second filter elements 12-1 and 12-2 are provided. Housing 10
Is made of, for example, stainless steel and has high heat resistance.
The first and second filter elements 12-1 and 12-2 are
It is in the form of a woven fabric and removes substances in the exhaust gas by burning it at a low temperature by an oxidation catalytic action. The upstream end plate 14 is fixed to the upstream end portion of the housing 10, and the downstream end plate 16 is fixed to the downstream end portion of the housing 10. A housing upstream connecting pipe 20 having a housing upstream connecting flange 18 is connected to the upstream end plate 14 on the axis of the housing 10. Further, a housing downstream side connecting pipe 24 having a housing downstream side connecting flange 22 is connected to the downstream end portion side of the housing 10 so as to be directed downward in the radial direction of the housing 10.

In the housing 10, an element holding plate 26 arranged on the upstream side in parallel with the upstream side end plate 14.
And the first and second filter elements 12-1 and 12-2
1st, 2nd exhaust introduction cylinders 12-1A, 12-2 on one end side of
A is attached via the first and second upstream side seal members 28-1 and 28-2, and the other end sides of the first and second filter elements 12-1 and 12-2 are the downstream side end plates 16. Is attached to the inner surface of the first and second downstream side sealing materials 30-1 and 30-2. Therefore, in the housing 10, the housing upstream chamber 32 is formed between the upstream end plate 14 and the element holding plate 26, and the housing 10 and the first and second filter elements 1 are formed.
A housing center side gas flow passage 34 and a housing peripheral surface side gas flow passage 36 are formed between 2-1 and 12-2.

The first and second filter elements 12-1,
Although not shown, 12-2 is both formed into a woven fabric by weaving a raw material made of fibrous ceramics and fibrous metal into a mesh having fine gaps. The fibrous ceramics are formed into a fibrous shape by a ceramic material having a heat resistant temperature of 1200 ° C. or higher, and the ceramic material is coated with an oxidation catalyst having a catalytic combustion starting temperature of 300 ° C. The fibrous metal is formed by forming a heat-resistant material into a fibrous shape.

The electrostatic precipitating substance removing unit 8 is disposed downstream of the combustion type substance removing unit 6 through which exhaust gas flows, and supplies an electric force between the dust collecting electrode 38 and the discharge electrode 40. It removes substances in the exhaust gas. In the electrostatic precipitating substance removing unit 8, a cylindrical main body 42 and an upstream cover 44 attached to an upstream end portion of the main body 42.
And a downstream cover 46 attached to a downstream end portion of the main body 42. A positive (+) dust collecting electrode 38 is fixedly provided on the inner peripheral surface of the main body 42. In the dust collecting electrode 38, as the negative (-) discharge electrodes 40, for example, four first to fourth discharge electrodes 40-1 to 40-4 are provided.
Are arranged.

At the upstream end portion of the main body portion 42, the housing downstream side connecting flange 2 of the housing downstream side connecting pipe 24 is provided.
A main body upstream side connecting pipe 50 having a main body upstream side connecting flange 48 connected to 2 is provided so as to be directed upward. A main body downstream side connecting pipe 54 having a main body downstream side connecting flange 52 is provided at a downstream end portion of the main body portion 42 so as to be directed downward.

The first to fourth discharge electrodes 40-1 to 40-4 are composed of the first to fourth brushes 56-1 to 56-4 for promoting dust collection of substances.
Through holes 58-1 to 58 for the first to fourth discharge electrodes, which are provided in the axial direction of the dust collecting electrode 38 and are formed at equal intervals in the circumferential direction.
It is located within 8-4. The through holes 58-1 to 58-4 for the first to fourth discharge electrodes are provided in the first to fourth dust collecting passages 60-1.
~ 60-4 are formed.

The upstream side end portions of the first to fourth discharge electrodes 40-1 to 40-4 are the first to fourth upstream side insulators 62-1 to 62-.
Supported by 4. The first to fourth upstream side insulators 62-1 to 62-4 are fixed between the main body upstream side flange 64 at the upstream side end portion of the main body part 42 and the cover upstream side flange 66 of the upstream side cover 44. It is attached to the upstream discharge electrode support plate 68. Also, the first to fourth discharge electrodes 4
The upstream side high pressure member 72 is attached to the upstream side end portions of 0-1 to 40-4 by the first to fourth upstream side attaching nuts 70-1 to 70-4, and the upstream side high pressure member 72 is attached to the upstream side high pressure member 72. The upstream high-voltage line 74 is the upstream fixing nut 70-
Connected by 1A. A part of the upstream high-voltage line 74 is supported by the upstream cover 44 by an upstream fixing insulator 76.

The first to fourth discharge electrodes 40-1 to 40-4 are also provided.
The downstream side end portions of the first to fourth downstream side insulators 78-1 to 78-1
Supported by 78-4. The first to fourth downstream side insulators 78-1 to 78-4 are fixed between the main body downstream side flange 80 at the downstream side end portion of the main body part 42 and the cover downstream side flange 82 of the downstream side cover 46. It is attached to the downstream discharge electrode support plate 84. In addition, the first to the fourth discharge electrodes 40-1 to 40-4 have the first to the fourth downstream end portions.
The downstream high-voltage member 88 is attached by the downstream-side mounting nuts 86-1 to 86-4, and the downstream high-voltage wire 90 is connected to the downstream high-voltage member 88 by the downstream fixing nut 70-2A. . The midpoint of the downstream high-voltage line 90 is supported by the downstream cover 46 by a downstream fixing insulator 92.

Although not shown, the dust collecting electrode 38, the upstream high-voltage line 74, and the downstream high-voltage line 90 communicate with a high-voltage generating section operated by a control panel.

In the body 42, the first to fourth
A main body upstream chamber 94 is formed between the upstream end surface of the dust collecting electrode 38 and the upstream discharge electrode support plate 68 so as to communicate with the dust collecting passages 60-1 to 60-4, and the dust collecting electrode 38 is also provided. Between the downstream end face and the downstream discharge electrode support plate 84, the main body downstream chamber 96
Are formed.

Next, the operation of the first embodiment will be described.

Exhaust gas from the combustor flows into the housing upstream side chamber 32 from the housing upstream side connecting pipe 20, and flows from the first and second exhaust gas introducing cylinders 12-1A and 12-2A to the first and second filter elements. It is guided into 12-1 and 12-2 and exits from the first and second filter elements 12-1 and 12-2. At this time, substances such as black smoke and particles in the exhaust gas are captured by the fibrous ceramics while passing through the first and second filter elements 12-1 and 12-2, and are oxidized by the residual oxygen in the exhaust gas. Due to the action, combustion is started at about 300 degrees Celsius. Furthermore,
Combustion of some substances initiated by the oxidation catalyst propagates to other trapped substances in a chain, and burns the entire substances of the first and second filter elements 12-1 and 12-2.

In the combustion of this substance, the exhaust gas is first and second
It is performed continuously while flowing through the filter elements 12-1 and 12-2, and its combustion temperature is maintained by the fibrous metal and does not decrease.

Therefore, the first and second filter elements 1
Substances such as black smoke and particles passing through 2-1 and 12-2 are burned at a low temperature by the oxidation catalyst, and the burning temperature is not lowered by the fibrous metal, and the first and second filters are used. The self-cleaning function of the elements 12-1 and 12-2 does not cause clogging.

Then, the exhaust gas discharged to the outside of the first and second filter elements 12-1 and 12-2 passes through the housing downstream side connecting pipe 24 and the main body upstream side connecting pipe 50, and the electrostatic precipitating substance. It flows to the removal section 8 side.

In the electrostatic precipitating substance removing section 8,
From the main body upstream side chamber 94 to the first to fourth dust collecting passages 60-1 to 60-6
0-4, and at this time, when a high DC voltage is applied between the dust collecting electrode 38 and the first to fourth discharge electrodes 40-1 to 40-4 by the high voltage generator, the dust collecting electrode 38 and the discharge electrode 38 are discharged. 40-1
An unequal electric field is created between 40-4 and 40-4, which causes a corona discharge and positive ions to form first to fourth ions.
When the exhaust gas is neutralized by the discharge electrodes 40-1 to 40-4, the negative ions travel toward the inner surface of the dust collecting electrode 38, and the exhaust gas passes through the non-uniform electric field, the substance in the exhaust gas becomes negative. The electric charge is obtained and becomes a negative electric body, and is attracted to the dust collecting electrode 38 by the Coulomb force. At this time, the first to fourth brushes 56-1 to 5-5
Due to the presence of the first to fourth discharge electrodes 40-1 to 40-4 provided with 6-4, the substance is the first to fourth discharge electrodes 40-1 to 40-4.
The positive ions are positively neutralized by the first to fourth discharge electrodes 40-1 to 40-4, and the negative ions are positively directed to the dust collecting electrode 38, because 0-4 is easily charged. Therefore, the substance can be effectively adsorbed to the inner surface of the dust collecting electrode 38.

As a result, the substances in the exhaust gas discharged from the combustor are burned and removed at a low temperature by the oxidation catalytic action in the combustion type substance removing unit 6, and the electric dust collecting type substance removing unit 8 is also used. Since the dust collecting electrode 38 and the first to fourth discharge electrodes 40-1 to 40-4 are removed by supplying an electric force, the ability to remove the substance in the exhaust gas becomes high and the substance is sufficiently removed. Can be removed and contribute to the improvement of the environment.

3 and 4 show a second embodiment of the present invention.

The feature of the second embodiment is that the purifying device 102 is constructed by integrally incorporating the electrostatic precipitating substance removing unit 104 into the combustion type substance removing unit 106. That is, in the cylindrical housing 108, the housing upstream side flange 110 at the upstream end portion is connected to the first one side flange 114 of the first cover 112, and the housing downstream side flange 116 at the downstream end portion is connected to the housing. The case one side flange 120 of 118 is connected. This connection case 118 is used for the exhaust downstream side chamber 1
22 is formed. Also, this connection case 1
The second cover 12 is attached to the other case flange 124 of the case 18.
Six second one-side flanges 128 are connected. The first end plate 1 is attached to the first other-side flange 130 of the first cover 112.
32 is fixed. A second end plate 136 is fixed to the second other-side flange 134 of the second cover 126.
Further, an upstream connecting pipe 140 having an upstream connecting flange 138 is connected to the upstream end portion of the housing 108. Further, a downstream side connecting pipe 144 having a downstream side connecting flange 142 is connected to the connecting case 118.

An upstream element holding plate 146 is fixed between the housing upstream flange 110 and the first one side flange 114. An upstream discharge electrode support plate 148 is fixed in the first cover 112 in parallel with the upstream element holding plate 146. A downstream element holding plate 150 is fixed between the other case side flange 124 and the second one side flange 128. A downstream discharge electrode support plate 152 is fixed in parallel with the downstream element holding plate 150 between the case other side flange 124 and the second one side flange 128.

In the housing 108, a filter element 154 is arranged on the axis. One end of the filter element 154 is supported by the upstream element holding plate 146 via the upstream seal material 156, and the exhaust flow tube 158 on the other end side of the filter element 154 has the downstream seal material 1.
It is supported by the downstream element holding plate 150 via 60. Therefore, in the housing 108, the exhaust upstream chamber 162 is formed outside the filter element 154.

A discharge electrode 164 is arranged on the axis of the filter element 154. This discharge electrode 164
Pass through a through hole (not shown) formed on the axial center of the filter element 154, and one end side is the upstream side insulator 16
6 is supported by the upstream side discharge electrode support plate 148, and the other end side is supported by the downstream side discharge electrode support plate 152 via the downstream side insulator 168. Although not shown, a dust collecting electrode is formed on the inner peripheral surface of the through hole. At one end of the discharge electrode 164, the upstream high-voltage wire 170 has the upstream mounting nut 172.
Connected by. This upstream side high voltage line 170 is
It is supported by the first cover 112 via the upstream fixed insulator 174. The downstream high-voltage wire 176 is connected to the other end of the discharge electrode 164 by a downstream mounting nut 178. The downstream high-voltage line 176 is supported by the second cover 126 via the downstream fixed insulator 180.

Next, the operation of the second embodiment will be described.

Exhaust gas from the combustor flows from the upstream connecting pipe 140 into the exhaust upstream chamber 162 of the housing 108, and then from the outside of the filter element 154 into the through hole inside. At this time, the substances in the exhaust gas are oxidatively catalyzed by the filter element 154 and discharged from the discharge electrode 16.
4. Effectively removes by the electric dust collection action of 4.

Then, the exhaust gas passes from the inside of the filter element 154 through the exhaust flow pipe 158 to the exhaust chamber 12 on the downstream side.
2 and then flow out from the downstream connecting pipe 144.

As a result, by integrally incorporating the electrostatic precipitating substance removing unit 104 into the combustion type substance removing unit 106, the substance in the exhaust gas is effectively removed and the purifying device 2 is downsized. , The degree of freedom of layout can be increased.

The present invention is not limited to the above-mentioned embodiments, and it is needless to say that various application modifications can be made.

For example, as shown in FIG. 5, by forming a plurality of recesses 202 on the inner peripheral surface of the dust collecting electrode 38, it is possible to substantially widen the adsorption surface area of the substance and improve the substance removing ability. .

[0036]

As is apparent from the above detailed description, according to the present invention, a substance in the exhaust gas is cooled to a low temperature in the middle of the exhaust system passage through which the exhaust gas discharged from the combustor flows. Electricity for removing the substance in the exhaust gas by supplying an electric force between the dust collecting electrode and the discharge electrode, as well as providing a combustion type substance removing portion provided with a woven filter element for burning and removing the substance. By providing the dust collection type substance removal unit, the substances in the exhaust gas discharged from the combustor are burned and removed at a low temperature by the oxidation catalyst action in the combustion type substance removal unit, and at the same time, the electrostatic dust collection type Since the substance is removed by supplying an electric force between the dust collecting electrode and the discharge electrode in the substance removing unit, the ability to remove the substance in the exhaust gas is enhanced, and the substance is sufficiently removed to improve the environment. Near It can be.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a purification device.

2 is a side view of the purification device of FIG. 1. FIG.

FIG. 3 is a system configuration diagram of a purifying device according to a second embodiment.

4 is a side view of the purification device of FIG. 3. FIG.

FIG. 5 is a system configuration diagram of a purifying device according to another modification.

[Explanation of symbols]

2 Purification device 4 exhaust system 6 Combustion type substance removal unit 8 Electrostatic precipitator type substance remover 10 housing 12-1 First filter element 12-2 Second filter element 38 Dust collector 40 discharge electrodes 42 Body

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B03C 3/155 B01D 46/42 B 3/40 53/36 103C // B01D 46/42 B03C 3/14 A F term (reference) 3G090 AA03 AA06 4D048 AA14 AB01 BA10X BA39X BB08 CD03 CD08 EA03 4D054 AA03 BA01 BB03 BC06 EA08 EA22 4D058 JA02 JB24 MA44 QA03 QA05 SA08 UA25

Claims (3)

[Claims] 1. A woven filter element is provided in the middle of an exhaust system passage through which exhaust gas discharged from a combustor unit flows, by which substances in the exhaust gas are burned and removed at a low temperature by an oxidation catalytic action. Exhaust gas characterized by being provided with a combustion type substance removing unit and an electric dust collecting type substance removing unit for removing a substance in exhaust gas by supplying an electric force between the dust collecting electrode and the discharge electrode Purifier for gas substances. 2. The purification of an exhaust gas substance according to claim 1, wherein the electrostatic precipitating substance removing unit is disposed on a downstream side of the combustion type substance removing unit through which exhaust gas flows. apparatus. 3. The exhaust gas substance purifying apparatus according to claim 1, wherein the electrostatic precipitating substance removing unit is integrally incorporated in the combustion type substance removing unit.