WO2022181149A1

WO2022181149A1 - Electric dust collector

Info

Publication number: WO2022181149A1
Application number: PCT/JP2022/002350
Authority: WO
Inventors: 幸平村上; 匡中川; 広幸當山; 章朝瑞慶覧; 大樹袴田
Original assignee: 富士電機株式会社; 学校法人幾徳学園
Priority date: 2021-02-25
Filing date: 2022-01-24
Publication date: 2022-09-01
Also published as: JP2022130055A; EP4173718A1; EP4173718A4; KR20230029962A; CN116056793A

Abstract

Provided is an electric dust collector comprising: a collecting part having a bottom plate on which particulate matter contained in exhaust gas is deposited, the bottom plate being provided with a plurality of first slits; and a propagation part having an internal space where microwaves propagate, the plurality of first slits being disposed in positions overlapping the internal space in a top view, and the microwaves propagating from the internal space to the collection part through the plurality of first slits.

Description

Electrostatic precipitator

The present invention relates to an electrostatic precipitator.

In Patent Document 1, "a collection unit that collects charged particles, and a microwave generation unit that generates microwaves to be introduced into the dust collection unit and burns the charged particles collected in the dust collection unit with the microwaves. and provides an electrostatic precipitator comprising:
[Prior art documents]
[Patent Literature]
[Patent Document 1] International Publication No. 2020/084934

Problem to be solved

When using microwaves to burn particulate matter contained in exhaust gas, it is desirable to improve the energy efficiency of microwaves.

General disclosure

A first aspect of the present invention provides an electrostatic precipitator. The electrostatic precipitator has a bottom plate on which the particulate matter contained in the exhaust gas is deposited, a collection part provided with a plurality of first slits in the bottom plate, a propagation part having an internal space in which microwaves propagate, Prepare. When viewed from above, the plurality of first slits are arranged at positions overlapping the internal space. Microwaves propagate from the internal space to the collecting section through the plurality of first slits.

The electric dust collector may further include a charging section that charges particulate matter and a dust collection section that collects the charged particulate matter. The collection section may be arranged below the dust collection section. Particulate matter collected by the dust collector may accumulate on the bottom plate.

The propagating portion is separated from the plurality of first slits by a predetermined distance in a first direction that is an in-plane direction of the bottom plate and a direction that intersects the long sides of the plurality of first slits. It may have one microwave inlet. Microwaves may be introduced into the interior space through the first microwave inlet. The width of each of the plurality of first slits in the first direction may be greater as the distance from the first microwave introduction port to one of the plurality of first slits in the first direction is greater.

The propagating portion is separated from the plurality of first slits by a predetermined distance in a first direction that is an in-plane direction of the bottom plate and a direction that intersects the long sides of the plurality of first slits. It may have one microwave inlet. Microwaves may be introduced into the interior space through the first microwave inlet. The larger the distance from the first microwave introduction port to one of the first slits in the first direction in the first direction, the more adjacent first slits in the first direction among the plurality of first slits. The interval with other first slits may be small.

The collecting part may further have a first side plate that intersects with the bottom plate, faces the internal space, and is arranged furthest apart from the first microwave introduction port in top view. A second slit may be provided in the first side plate.

The width of the propagation part in the direction intersecting the first direction may spread from the first microwave introduction port to the plurality of first slits.

The width of the propagating portion in the direction intersecting the first direction may widen in a tapered shape from the first microwave introduction port to the plurality of first slits.

The width of the propagation portion in a second direction that intersects with the first direction and the width of the propagation portion in a third direction that is a third direction that intersects with the first direction and is different from the second direction are It may extend over a plurality of first slits.

The width of the propagation portion in a second direction that intersects with the first direction and the width of the propagation portion in a third direction that is a third direction that intersects with the first direction and is different from the second direction are It may spread like a horn across the plurality of first slits.

The propagation section may further include an outer plate facing the internal space and extending in the first direction when viewed from above, and a second microwave introduction port provided in the outer plate.

The propagation part may further have an outer bottom plate facing the internal space and provided below the bottom plate, and a third microwave introduction port provided in the outer bottom plate.

A microwave introduction pipe through which microwaves introduced into the internal space from the outside of the propagation part pass may be connected to the first microwave introduction port. The microwave introduction pipe may have a first recess that is recessed in a direction intersecting the traveling direction of the microwave. The depth of the first recess may be 1/4 of the microwave wavelength.

The dust collection part may have a dust collection electrode. The dust collection electrode may have a second concave portion recessed in a direction intersecting the direction from the collection portion to the dust collection portion. The depth of the second recess may be ¼ of the microwave wavelength.

The dust collection electrode may be provided with an opening through which the exhaust gas passes. The second recess may be arranged between the collecting portion and the opening in the direction from the collecting portion to the dust collecting portion.

The charging part and the dust collection part may be provided in the pipe through which the exhaust gas passes. The collecting part may be arranged below the pipe.

The collection part may further have a second side plate that intersects with the bottom plate and faces the internal space. A plurality of first slits may be provided extending from the bottom plate to the second side plate.

The electrostatic precipitator may further include a coating material provided on the upper surface of the bottom plate and covering at least one of the plurality of first slits.

The covering material may be provided inside at least one first slit.

The covering material may have a projection projecting from the upper surface to the lower surface of the bottom plate. The protrusion may be provided inside the first slit.

The covering material may be provided inside the first slit provided in the second side plate.

The covering material may be provided inside the second slit.

A depression corresponding to the first slit may be provided on the upper surface of the covering material.

The covering material may be removable from the top surface of the bottom plate.

It should be noted that the above outline of the invention does not list all the features of the present invention. Subcombinations of these feature groups can also be inventions.

It is a figure showing an example of electrostatic precipitator 100 concerning one embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the block diagram of the electrostatic precipitator 100 which concerns on one Embodiment of this invention, and the electrostatic precipitator system 200. FIG. It is a figure which shows an example in the top view of the electrostatic precipitator 100 shown by FIG. 4 is a diagram showing an example of a cross section taken along line aa' shown in FIG. 3; FIG. It is a figure which shows another example in the top view of the electrostatic precipitator 100 shown by FIG. It is a figure which shows another example in the top view of the electrostatic precipitator 100 shown by FIG. It is a figure which shows another example in the top view of the electrostatic precipitator 100 shown by FIG. It is a figure which shows an example in the side view of the vicinity of the baseplate 11 in FIG. It is a figure which shows another example of the electrostatic precipitator 100 shown by FIG. It is a figure which shows another example of the electrostatic precipitator 100 shown by FIG. It is a figure which shows another example in the top view of the electrostatic precipitator 100 shown by FIG. It is a figure which shows an example in the bottom view of the electrostatic precipitator 100 shown by FIG. It is a figure which shows another example in the top view of the electrostatic precipitator 100 shown by FIG. FIG. 14 is a diagram showing an example of a cross section taken along line aa' shown in FIG. 13; 4 is an enlarged view of the vicinity of a first microwave introduction port 22 in FIG. 3. FIG. 5 is an enlarged view of the vicinity of a first microwave introduction port 22 in FIG. 4. FIG. FIG. 2 is an enlarged view of the inside of the dust collector 40 in the electrostatic precipitator 100 shown in FIG. 1; FIG. 18 is an enlarged view of a dust collection electrode 41 in FIG. 17; 18 is another enlarged view of the dust collection electrode 41 in FIG. 17. FIG. It is a figure which shows an example of arrangement|positioning of the electrostatic precipitator 100. FIG.

Although the present invention will be described below through embodiments of the invention, the following embodiments do not limit the invention according to the scope of claims. Also, not all combinations of features described in the embodiments are essential for the solution of the invention.

FIG. 1 is a diagram showing an example of an electrostatic precipitator 100 according to one embodiment of the present invention. The electrostatic precipitator 100 includes a collection section 10 and a propagation section 20 . The electric dust collector 100 may include a dust collector 40 . The collecting part 10 has a bottom plate 11 . The propagation part 20 has an internal space 21 through which microwaves propagate. In this example, the propagation part 20 has a first microwave introduction port 22 .

In this specification, technical matters may be explained using X, Y and Z orthogonal coordinate axes. In this specification, the plane parallel to the plate surface of the bottom plate 11 is defined as the XY plane, and the direction perpendicular to the plate surface of the bottom plate 11 is defined as the Z-axis direction. The XY plane may be a horizontal plane, and the Z-axis direction may be parallel to the direction of gravity. In this specification, a predetermined direction in the XY plane is defined as the X-axis direction, and a direction orthogonal to the X-axis in the XY plane is defined as the Y-axis direction.

In this specification, in the Z-axis direction, the side of the dust collecting section 40 is called "upper", and the side of the propagating section 20 is called "lower". In this example, the Z-axis direction is the direction of gravity, but the "up" and "down" directions are not limited to the direction of gravity. In this specification, a top view refers to a case where the electrostatic precipitator 100 is viewed in the Z-axis direction from the dust collecting section 40 to the propagating section 20 . In this example, the collection unit 10 is arranged below the dust collection unit 40 . In this specification, a bottom view refers to a case where the electrostatic precipitator 100 is viewed in the Z-axis direction from the propagating portion 20 to the dust collecting portion 40 . In this specification, a side view refers to a case where the electrostatic precipitator 100 is viewed in the XY plane direction.

FIG. 2 is a diagram showing an example of a block diagram of the electrostatic precipitator 100 and the electrostatic precipitator system 200 according to one embodiment of the present invention. In this example, the electrostatic precipitator system 200 includes a microwave generator 91 , a power unit 92 and an electrostatic precipitator 100 . The power plant 92 generates exhaust gas 30 by burning fuel. The power plant 92 is, for example, an engine. Exhaust gas 30 contains particulate matter (PM) 32 . Particulate matter 32 is also referred to as black carbon. Particulate matter 32 is generated by incomplete combustion of fossil fuels. The particulate matter 32 is fine particles containing carbon as a main component.

The electrostatic precipitator 100 may include a charging section 90. The charging section 90 charges the particulate matter 32 . The charging section 90 may generate negative ions by negative corona discharge. The charging section 90 may charge the particulate matter 32 with the negative ions.

The dust collection unit 40 collects the charged particulate matter 32 . The collecting unit 10 collects particulate matter 32 . Particulate matter 32 collected by the dust collector 40 accumulates on the bottom plate 11 (see FIG. 1) of the collector 10 . As shown in FIG. 1 , in this example, the collecting section 10 is arranged below the dust collecting section 40 . In this example, the particulate matter 32 dropped from the dust collection section 40 to the collection section 10 is deposited on the bottom plate 11 .

The microwave generator 91 generates microwaves 93 . The particulate matter 32 collected by the collection unit 10 is burned by the microwaves 93 . Microwaves 93 are electromagnetic waves having a frequency of 300 MHz to 300 GHz.

FIG. 3 is a top view showing an example of the electrostatic precipitator 100 shown in FIG. In FIG. 3, the dust collection part 40 is omitted. A microwave introduction pipe 94 may be connected to the first microwave introduction port 22 . In this example, microwaves 93 introduced into the internal space 21 from the outside of the propagation section 20 pass through the microwave introduction pipe 94 .

The bottom plate 11 has an upper surface 96 and a lower surface 98 . Particulate matter 32 is deposited on top surface 96 . A plurality of first slits 80 are provided in the bottom plate 11 . In this example, nine first slits 80 are provided in the bottom plate 11 . The first slit 80 extends through the bottom plate 11 from the upper surface 96 to the lower surface 98 . The first slit 80 of this example has a rectangular shape with long sides 81 and short sides 82 .

The in-plane direction of the bottom plate 11 and the direction crossing the long side 81 of the first slit 80 is defined as a first direction dr1. In this example, the first direction dr<b>1 is a direction perpendicular to the long side 81 and parallel to the short side 82 . In this example, the first direction dr1 is parallel to the Y-axis direction. The in-plane direction of the bottom plate 11 and the direction crossing the short side 82 of the first slit 80 is defined as a second direction dr2. In this example, the second direction dr<b>2 is a direction perpendicular to the short side 82 and parallel to the long side 81 . In this example, the second direction dr2 is parallel to the X-axis direction.

In this example, the collecting part 10 has a first side plate 15, a second side plate 12 and a third side plate 18. In this example, the collecting section 10 has two second side plates 12 (second side plate 12-1 and second side plate 12-2). The second side plate 12-1 and the second side plate 12-2 face each other across a collection space 97 (described later) in the second direction dr2.

The first side plate 15 and the third side plate 18 of this example extend in the second direction dr2 when viewed from above. The second side plate 12 of this example extends in the first direction dr1 when viewed from above. Among the first side plate 15, the second side plate 12 and the third side plate 18, the first side plate 15 is arranged farthest from the first microwave inlet 22 in the first direction dr1.

In this example, first side plate 15 includes outer surface 16 and inner surface 17, second side plate 12 includes outer surface 13 and inner surface 14, and third side plate 18 includes outer surface 19 and inner surface 99. include. In this example, the collection part 10 has a collection space 97 . The collection space 97 is a space above the upper surface 96 of the bottom plate 11 and is a space surrounded by the inner surface 17 , the inner surface 14 and the inner surface 99 .

The first side plate 15 , the second side plate 12 and the third side plate 18 may face the internal space 21 . In this example, the outer surface 16 of the first side plate 15 , the outer surface 13 of the second side plate 12 , and the outer surface 19 of the third side plate 18 face the interior space 21 .

The first side plate 15 , the second side plate 12 and the third side plate 18 may cross the bottom plate 11 . In this example, the first side plate 15 , the second side plate 12 and the third side plate 18 are perpendicular to the bottom plate 11 .

In this example, the propagation part 20 has a top plate 24 , an outer bottom plate 25 , an outer plate 23 and an outer plate 33 . The outer bottom plate 25 is arranged below the top plate 24 in the Z-axis direction and separated from the top plate 24 . Top plate 24 , outer bottom plate 25 , outer plate 23 and outer plate 33 face interior space 21 .

In this example, the plate surfaces of the top plate 24 and the outer bottom plate 25 are arranged parallel to the XY plane. In this example, the propagation part 20 has two outer plates 23 (an outer plate 23-1 and an outer plate 23-2). In this example, the propagation section 20 has two outer plates 33 (an outer plate 33-1 and an outer plate 33-2). The outer plate 23 of this example extends in the first direction dr1 when viewed from above. The outer plate 33 of this example extends in the second direction dr2 when viewed from above.

The outer plate 23 includes an inner surface 26. Outer plate 33 includes an inner surface 36 . The internal space 21 is a space sandwiched between the top plate 24 and the outer bottom plate 25 in the Z-axis direction and surrounded by the inner side surface 26 and the inner side surface 36 in the XY plane.

The bottom plate 11 and the first slit 80 are arranged at positions overlapping with the internal space 21 of the propagation section 20 when viewed from above. In this example, the bottom surface 98 of the bottom plate 11 is in contact with the internal space 21 . In this example, the collection space 97 of the collection section 10 and the internal space 21 of the propagation section 20 communicate with each other via the first slit 80 .

The widths of the internal space 21 in the first direction dr1 and the second direction dr2 are assumed to be width Wp1 and width Wp2, respectively. Width Wp1 may be different from or equal to width Wp2. The width Wp1 may be 1000 mm or more and 1300 mm or less. The width Wp2 may be 50 mm or more and 500 mm or less.

The widths of the collection space 97 in the first direction dr1 and the second direction dr2 are defined as width Wc1 and width Wc2, respectively. Width Wc1 may be different from or equal to width Wc2. The width Wc1 may be 800 mm or more and 1000 mm or less. The width Wc2 may be 50 mm or more and 450 mm or less.

The width Wc1 may be smaller than the width Wp1 and may be equal to the width Wp1. Width Wc2 may be smaller than width Wp2 and may be equal to width Wp2.

In this example, microwaves 93 are introduced into the internal space 21 through the first microwave introduction port 22 . The microwave 93 may be introduced in the first direction dr1 at the position of the first microwave introduction port 22 in the first direction dr1. The first microwave introduction port 22 may be separated from the plurality of first slits 80 by a predetermined distance in the first direction dr1. Let the predetermined distance be distance ds1.

The microwave 93 introduced in the first direction dr1 tends to propagate radially in the XY plane in the internal space 21 when viewed from above. Therefore, since the first microwave introduction port 22 is separated from the first slit 80 by the distance ds1, the microwaves 93 are likely to be uniform at the position of the first slit 80 in the XY plane. The fact that the microwaves 93 are uniform means that the traveling direction of the microwaves 93 is not biased toward a specific traveling direction in the XY plane and in the Z-axis direction. The distance ds1 may be 0.2 times or more and 400 times or less, or may be 0.4 times or more and 200 times or less, the wavelength of the microwave 93 .

The microwave 93 propagates from the internal space 21 to the collection space 97 of the collection section 10 through the plurality of first slits 80 . Since the microwaves 93 are uniform at the position of the first slit 80 in the XY plane, the microwaves 93 easily propagate uniformly to the collection space 97 through the first slit 80 . This makes it easier for the microwaves 93 to uniformly irradiate the particulate matter 32 deposited on the bottom plate 11 regardless of the position of the particulate matter 32 on the upper surface 96 . Therefore, the particulate matter 32 is more likely to be efficiently burned by the microwaves 93 .

The long side 81 of the first slit 80 may be arranged in a direction that intersects the direction in which the microwave 93 is introduced into the internal space 21 (the first direction dr1 in this example). This makes it easier for the particulate matter 32 to be burned efficiently by the microwaves 93 than when the long sides 81 are arranged in a direction parallel to the direction in which the microwaves 93 are introduced.

In this example, the microwaves 93 introduced into the internal space 21 propagate radially in the internal space 21 , and the radially propagated microwaves 93 propagate to the collection space 97 through the plurality of first slits 80 . Therefore, in this example, the microwaves 93 may be introduced into the internal space 21 from one first microwave introduction port 22 . Therefore, the number of microwave introducing pipes 94 through which the microwaves 93 generated by the microwave generating section 91 pass may be one. Microwave inlet tubes 94 can be expensive. In this example, since only one microwave introduction pipe 94 is required, the cost of the electrostatic precipitator system 200 (see FIG. 2) is more likely to be reduced than when a plurality of microwave introduction pipes 94 are arranged.

The width of the first slit 80 in the first direction dr1 is assumed to be width W1. Width W1 is the width of short side 82 . The width W1 may be 0.1 to 40 times the wavelength of the microwave 93 . The width W1 may be 15 mm or more and 40 mm or less.

The width of the interval between one first slit 80 and another first slit 80 adjacent in the first direction dr1 is defined as width W2. In this example, the width W2 of the interval between one first slit 80 and another first slit 80 adjacent in the first direction dr1 is equal over all of the plurality of first slits 80 . The width W2 may be 2.0 to 10.0 times the width W1. The width W2 may be 50 mm or more and 200 mm or less.

The width of the first slit 80 in the second direction dr2 is assumed to be width W3. A width W3 is the width of the long side 81 . In this example, the width W3 of the long side 81 is the same across all of the multiple first slits 80 . Width W3 may be 1/2 or more of the wavelength of microwave 93 . When the frequency of microwave 93 is 2.45 GHz, width W3 may be 61.3 mm or more.

FIG. 4 is a diagram showing an example of a cross section taken along line aa' shown in FIG. The aa' line shows the microwave introduction pipe 94, the outer plate 33-2, the first microwave introduction port 22, the top plate 24, the outer bottom plate 25, the internal space 21, the third side plate 18, the dust collection part 40, the It is a YZ section passing through the collecting space 97, the first side plate 15 and the outer plate 33-1. In FIG. 4, the dust collector 40 is indicated by hatching. However, in FIG. 4, the dust collecting electrode in the dust collecting portion 40 is omitted. In this example, the particulate matter 32 collected in the dust collecting section 40 falls onto the upper surface 96 of the bottom plate 11 .

Let the upper end of the collecting part 10 be the upper end Eh. In FIG. 4, the position of the upper end Eh in the Z-axis direction is indicated by a rough broken line. In the Z-axis direction, the position of the upper end Eh may match the position of the upper surface of the top plate 24 in the propagation section 20 . The collecting section 10 may be arranged inside the propagating section 20 . A lower surface 98 of the bottom plate 11 may be in contact with the internal space 21 .

The upper surface of the outer bottom plate 25 is referred to as an upper surface 27. A direction perpendicular to the first direction dr1 and the second direction dr2 is defined as a third direction dr3. In this example, the third direction dr3 is the same as the Z-axis direction.

The lower surface 98 of the bottom plate 11 may be spaced apart from the upper surface 27 by a predetermined distance in the third direction dr3. Let the predetermined distance be distance ds2. As described above, the microwaves 93 introduced in the first direction dr1 tend to radially propagate through the internal space 21 in the XY plane when viewed from above. Therefore, since the lower surface 98 is separated from the upper surface 27 by the distance ds2, the microwaves 93 introduced into the internal space 21 are directed from the internal space 21 to the collection space 97 in the third direction dr3. easier to proceed. In FIG. 4, the microwaves 93 traveling in the direction from the interior space 21 to the collection space 97 are indicated by dashed arrows.

The distance ds2 may be 200 times or less the wavelength of the microwave 93, or may be 100 times or less. The distance ds may be 250 mm or less, and may be 200 mm or less.

At least a portion of the dust collecting section 40 may be arranged so as to overlap the collecting section 10 in the Z-axis direction. In this example, part of the dust collecting section 40 and the collecting section 10 are arranged to overlap in the Z-axis direction between the upper surface 96 of the bottom plate 11 and the upper end Eh of the collecting section 10 .

FIG. 5 is a top view showing another example of the electrostatic precipitator 100 shown in FIG. The first slit 80 arranged closest to the first microwave introduction port 22 in the first direction dr1 is referred to as a first slit 80-1, and the first slit 80 arranged farthest away from the first microwave introduction port 22 is referred to as a first slit 80-1. 9. Widths W1 of the first slits 80-1 to 80-9 are set to widths W1-1 to W1-9, respectively.

In the present example, the larger the distance from the first microwave introduction port 22 to one of the plurality of first slits 80 in the first direction dr1, the more the plurality of first slits in the first direction dr1. Each width of 80 is large. That is, the width W1 increases from the first slit 80-1 to the first slit 80-9. Of the nine widths W1, the width W1-1 is the smallest and the width W1-9 is the largest. This makes it easier to suppress the loss of the microwaves 93 than when all nine widths W1 are equal (that is, when shown in FIG. 3).

FIG. 6 is a top view showing another example of the electrostatic precipitator 100 shown in FIG. In this example, ten first slits 80 are provided in the bottom plate 11 . The first slit 80 arranged closest to the first microwave introduction port 22 in the first direction dr1 is referred to as a first slit 80-1, and the first slit 80 arranged farthest away from the first microwave introduction port 22 is referred to as a first slit 80-1. 10. In this example, the width W1 (see FIG. 3) of one first slit 80 is equal over the ten first slits 80. As shown in FIG.

The width of the interval between the first slit 80-k and the first slit 80-(k+1) adjacent in the first direction dr1 is defined as width W2-k. Here, k is an integer of 1 or more and 9 or less. In the present example, the larger the distance from the first microwave introduction port 22 to one first slit 80 of the plurality of first slits 80 in the first direction dr1, the first of the plurality of first slits 80. The distance between one first slit 80 and another first slit 80 adjacent in the direction dr1 is small. That is, in this example, the larger k is, the smaller the width W2-k is. This makes it easier to suppress the loss of the microwave 93 than when all eight widths W2 are equal (that is, when shown in FIG. 3).

FIG. 7 is a top view showing another example of the electrostatic precipitator 100 shown in FIG. The electrostatic precipitator 100 of this example is different from the electrostatic precipitator 100 shown in FIG. 3 in that a coating material 83 is further provided. In FIG. 7, the covering material 83 is indicated by hatching.

In this example, the covering material 83 is provided on the upper surface 96 of the bottom plate 11 (see FIG. 4). That is, in this example, the covering material 83 is arranged in the collection space 97 . The covering material 83 may cover at least one first slit 80 among the plurality of first slits 80 . In this example, the covering material 83 covers all (nine) first slits 80 .

The particulate matter 32 (see FIG. 4) does not pass through the covering material 83. The microwaves 93 pass through the covering material 83 . The transmittance and absorbance of the microwaves 93 in the covering material 83 may be 90% or more and less than 10%, respectively. The covering material 83 is, for example, at least one of a heat insulating material such as glass wool, ceramic fiber, and quartz glass.

The temperature of the exhaust gas 30 (see FIG. 2) discharged from the power plant 92 (see FIG. 2) may range from 300°C to 400°C. Therefore, the temperature of the particulate matter 32 may also be 300.degree. C. to 400.degree. When the particulate matter 32 is combusted by the microwaves 93, the combustion may further raise the temperature. Therefore, the heat resistance temperature of the covering material 83 is preferably 800° C. or higher.

FIG. 8 is a diagram showing an example of a side view of the vicinity of the bottom plate 11 in FIG. FIG. 8 is a diagram of the electrostatic precipitator 100 viewed in the X-axis direction. FIG. 8 is an enlarged view of the vicinity of one first slit 80. As shown in FIG.

The upper and lower surfaces of the covering material 83 are referred to as an upper surface 87 and a lower surface 86, respectively. In this example, the lower surface 86 of the covering material 83 is provided in contact with the upper surface 96 of the bottom plate 11 .

The covering material 83 may be provided inside at least one first slit 80 . The covering material 83 may have a protrusion 84 protruding from the upper surface 96 of the bottom plate 11 toward the lower surface 98 thereof. The protrusion 84 may be provided inside the first slit 80 . The protruding portion 84 being provided inside the first slit 80 means that the protruding portion 84 is arranged between the upper surface 96 and the lower surface 98 in the third direction dr3. By providing the covering material 83 inside the first slit 80 , the covering material 83 can be easily fixed to the upper surface 96 of the bottom plate 11 .

A depression 85 corresponding to the first slit 80 may be provided on the upper surface 87 of the covering material 83 . The recess 85 is a recess provided in the upper surface 87 of the coating material 83 and is recessed in the coating material 83 in the direction from the upper surface 87 to the lower surface 86 of the coating material 83 . The recess 85 corresponding to the first slit 80 means that at least part of the recess 85 in the first direction dr1 and at least part of the first slit 80 in the first direction dr1 are arranged at the same position. Point. In this example, the entire recess 85 in the first direction dr1 and the entire first slit 80 in the first direction dr1 are arranged at the same position.

When the upper surface 87 of the covering material 83 is provided with the depressions 85 , the particulate matter 32 falling on the upper surface 87 of the covering material 83 tends to accumulate in the depressions 85 . Since the recesses 85 correspond to the first slits 80 , the particulate matter 32 deposited in the recesses 85 is irradiated by the microwaves 93 traveling through the first slits 80 in the direction from the internal space 21 to the collection space 97 . Burns easily. Therefore, the combustion efficiency of the particulate matter 32 in the electrostatic precipitator 100 is more likely to be improved than when the recess 85 is not provided in the upper surface 87 .

Although FIG. 8 shows the vicinity of one first slit 80, a convex portion 84 is provided inside at least one first slit 80 among the plurality of first slits 80 shown in FIG. you can A convex portion 84 may be provided inside all of the plurality of first slits 80 . A recess 85 corresponding to at least one first slit 80 of the plurality of first slits 80 may be provided on the upper surface 87 of the covering material 83 . A plurality of depressions 85 corresponding to the plurality of first slits 80 may be provided on the upper surface 87 of the covering material 83 .

The covering material 83 may be removable from the upper surface 96 of the bottom plate 11 . As described above, the covering material 83 is at least one of a heat insulating material such as glass wool, ceramic fiber, and quartz glass. When the covering material 83 is a heat insulating material such as glass wool, for example, when a pressing force is applied to the covering material 83 arranged on the upper surface 96 of the bottom plate 11 in the direction from the upper surface 96 to the lower surface 98, the covering material 83 and the part of the covering material 83 arranged above the first slit 80 tends to enter the inside of the first slit 80 . As a result, protrusions 84 are likely to be formed on the covering material 83 , and depressions 85 corresponding to the first slits 80 are likely to be formed on the upper surface 87 of the covering material 83 .

FIG. 9 is a diagram showing another example of the electrostatic precipitator 100 shown in FIG. FIG. 9 is an example when the electrostatic precipitator 100 shown in FIG. 1 is viewed from the second side plate 12-1 to the second side plate 12-2 (see FIG. 3). However, in FIG. 9, the outer plate 23 (see FIG. 3) of the propagation part 20 is omitted. In FIG. 9, hatching of the dust collecting portion 40 shown in FIG. 4 is omitted.

In this example, the first slit 80 is also provided in the second side plate 12 . The electrostatic precipitator 100 of this example differs from the electrostatic precipitator shown in FIG. 3 in this respect. A first slit 80 provided in the second side plate 12 penetrates the second side plate 12 from the outer surface 13 to the inner surface 14 (see FIG. 3) of the second side plate 12 .

A plurality of first slits 80 may be provided extending from the bottom plate 11 to the second side plate 12 . The plurality of first slits may be provided extending from the bottom plate 11 to the second side plate 12-1, and may be provided extending from the bottom plate 11 to the second side plate 12-2 (see FIG. 3). good.

Since the plurality of first slits 80 are also provided in the second side plate 12, the microwaves 93 (see FIGS. 3 and 4) propagating in the second direction dr2 (see FIG. 3) in the internal space 21 are It becomes easier to propagate to the collection space 97 through the first slit 80 provided in the second side plate 12 . This makes it easier for the particulate matter 32 to be burned by the microwaves 93 than when the plurality of first slits 80 are provided only in the bottom plate 11 (that is, in the example of FIG. 3).

When the covering material 83 is provided on the upper surface 96 of the bottom plate 11 (that is, in the case of FIG. 7), the covering material 83 may also be provided on the inner surface 14 (see FIG. 3) of the second side plate 12. When the coating material 83 is provided on the inner surface 14 of the second side plate 12, the coating material 83 is provided inside the first slit 80 provided in the second side plate 12, as in the example shown in FIG. may be provided.

FIG. 10 is a diagram showing another example of the electrostatic precipitator 100 shown in FIG. FIG. 10 is an example when the electrostatic precipitator 100 shown in FIG. 1 is viewed from the first side plate 15 to the third side plate 18 (see FIG. 3). However, in FIG. 10, the outer plate 33 (see FIG. 3) of the propagation part 20 is omitted. In FIG. 10, hatching of the dust collecting portion 40 shown in FIG. 4 is omitted.

In this example, the first side plate 15 is provided with a second slit 88 . The electrostatic precipitator 100 of this example differs from the electrostatic precipitator shown in FIG. 3 in this respect. The second slit 88 extends through the first side plate 15 from the outer surface 16 to the inner surface 17 (see FIG. 3) of the first side plate 15 .

A plurality of second slits 88 may be provided in the first side plate 15 . The long side of the second slit 88 may be provided parallel to the second direction dr2, or may be provided parallel to the third direction dr3. In this example, the long side of the second slit 88 is provided parallel to the second direction dr2.

Since the second slit 88 is provided in the first side plate 15, the microwave 93 reflected by the inner surface 36-1 (see FIG. 3) of the propagation part 20 passes through the second slit 88 to the collection space 97. easier to propagate. This makes it easier for the particulate matter 32 to be burned by the microwaves 93 than when the plurality of first slits 80 are provided only in the bottom plate 11 (that is, in the example of FIG. 3).

When the covering material 83 is provided on the upper surface 96 of the bottom plate 11 (that is, in the case of FIG. 7), the covering material 83 may also be provided on the inner surface 17 (see FIG. 3) of the first side plate 15. When the covering material 83 is provided on the inner surface 17 of the first side plate 15, the covering material 83 may be provided inside the second slit 88 as in the example shown in FIG.

FIG. 11 is a diagram showing another example of the electrostatic precipitator 100 shown in FIG. 1 viewed from above. In the electrostatic precipitator 100 of this example, the propagation part 20 further has a second microwave introduction port 61 provided in the outer plate 23 . The electrostatic precipitator 100 of this example differs from the electrostatic precipitator 100 shown in FIG. 3 in this respect.

The propagation section 20 may have a plurality of second microwave introduction ports 61 . The propagation part 20 of this example has two second microwave introduction ports 61 (a second microwave introduction port 61-1 and a second microwave introduction port 61-2). In this example, the outer plate 23-1 is provided with the second microwave introduction port 61-1, and the outer plate 23-2 is provided with the second microwave introduction port 61-2.

A microwave introduction pipe 60 may be connected to the second microwave introduction port 61 . In this example, a microwave introduction pipe 60-1 is connected to the second microwave introduction port 61-1, and a microwave introduction pipe 60-2 is connected to the second microwave introduction port 61-2. In this example, microwaves 93 introduced into the internal space 21 from the outside of the propagating section 20 pass through the microwave introducing pipe 94 and the microwave introducing pipe 60 .

The direction of the microwaves 93 introduced into the internal space 21 through the first microwave introduction port 22 and the direction of the microwaves 93 introduced into the internal space 21 through the second microwave introduction port 61 may be different. In this example, the direction of the microwaves 93 introduced into the internal space 21 through the first microwave introduction port 22 is the first direction dr1. In this example, the direction of the microwave 93 introduced into the internal space 21 through the second microwave introduction port 61-1 is the second direction dr2, and the microwave introduced into the internal space 21 through the second microwave introduction port 61-2. The direction of the waves 93 is parallel to the second direction dr2 and opposite to the second direction dr2. Since the direction of the microwaves 93 introduced into the internal space 21 through the first microwave introduction port 22 is different from the direction of the microwaves 93 introduced into the internal space 21 through the second microwave introduction port 61, the internal space 21 , the microwave 93 tends to be more uniform.

In this example, it is preferable that the second side plate 12 of the collection part 10 is provided with the first slit 80 (see FIG. 9). Particulate matter collected in the collection space 97 by introducing the microwave 93 into the internal space 21 through the second microwave introduction port 61 and providing the first slit 80 in the second side plate 12 32 are more likely to burn more efficiently.

FIG. 12 is a diagram showing an example of the bottom view of the electrostatic precipitator 100 shown in FIG. In the electrostatic precipitator 100 of this example, the propagation part 20 further has a third microwave introduction port 63 provided in the outer bottom plate 25 . The electrostatic precipitator 100 of this example differs from the electrostatic precipitator 100 shown in FIG. 11 in this respect.

A microwave introduction pipe 62 may be connected to the third microwave introduction port 63 . In this example, a microwave 93 introduced into the internal space 21 from the outside of the propagating section 20 passes through the microwave introduction pipe 94 , the microwave introduction pipe 60 and the microwave introduction pipe 62 .

The direction of the microwaves 93 introduced into the internal space 21 through the third microwave introduction port 63 is the direction of the microwaves 93 introduced into the internal space 21 through the first microwave introduction port 22 and the direction of the microwaves 93 introduced into the internal space 21 through the second microwave introduction port 61. The direction of the microwaves 93 introduced into the internal space 21 may be different. This makes it easier for the microwaves 93 to be more uniform in the internal space 21 than in the example shown in FIG. In this example, the direction of the microwaves 93 introduced into the internal space 21 through the third microwave introduction port 63 is the third direction dr3 (see FIG. 4).

The third microwave introduction port 63 may be arranged at a position overlapping the bottom plate 11 of the collecting section 10 in a bottom view. Thereby, the microwaves 93 introduced into the internal space 21 through the third microwave introduction port 63 are easily introduced into the collection space 97 . This makes it easier for the particulate matter 32 collected in the collection space 97 to be burned more efficiently.

FIG. 13 is a top view showing another example of the electrostatic precipitator 100 shown in FIG. In this example, the width of the propagating portion 20 in the direction intersecting the first direction dr1 extends from the first microwave introduction port 22 to the plurality of first slits 80 . The electrostatic precipitator 100 of this example differs from the electrostatic precipitator 100 shown in FIG. 11 in this respect. The direction crossing the first direction dr1 may be a direction parallel to the long side 81 of the first slit 80 . In this example, the width of the propagating portion 20 in the second direction dr2 is tapered from the first microwave introduction port 22 to the plurality of first slits 80 .

FIG. 14 is a diagram showing an example of a cross section taken along line aa' shown in FIG. In this example, the width of the propagating portion 20 in the third direction dr3 also widens from the first microwave introduction port 22 to the plurality of first slits 80 . That is, in this example, the internal space 21 from the first microwave introduction port 22 to the plurality of first slits 80 has a horn shape. Therefore, the gain of the microwave 93 tends to be greater than in the examples shown in FIGS. 3 and 4. FIG.

FIG. 15 is an enlarged view of the vicinity of the first microwave introduction port 22 in FIG. The microwave introduction tube 94 may have a first recess 50 . The first concave portion 50 is recessed in a direction (in this example, the direction from the dust collecting portion 40 to the collecting portion 10) that intersects the traveling direction of the microwave 93 (in this example, the Y-axis direction).

FIG. 16 is an enlarged view of the vicinity of the first microwave introduction port 22 in FIG. The first concave portion 50 of this example is recessed in the direction from the dust collecting portion 40 to the collecting portion 10 (see FIG. 4). The depth of the first concave portion 50 is defined as depth dp1.

The depth dp1 may be 1/4 of the wavelength of the microwave 93 (see FIG. 3, etc.). As a result, the microwaves 93 traveling in the direction from the microwave introduction pipe 94 to the internal space 21 and the microwaves 93 traveling from the internal space 21 to the microwave introduction pipe It cancels out the microwave 93 traveling in the direction toward 94 . Since the depth dp1 is 1/4 of the wavelength of the microwave 93, the reflectance of the microwave 93 reflected from the first concave portion 50 toward the internal space 21 can be easily improved. This facilitates efficient combustion of the particulate matter 32 in the collecting section 10 . The first concave portion 50 may have a so-called choke structure that cancels out the traveling wave and the reflected wave of the microwave 93 .

17 is an enlarged view of the inside of the dust collector 40 in the electrostatic precipitator 100 shown in FIG. 1. FIG. However, in FIG. 17, the solid line indicating the dust collecting portion 40, the collecting portion 10 and the propagating portion 20 in FIG. 1 are omitted. The dust collection part 40 may have a dust collection electrode 41 . The dust collection part 40 may have a plurality of dust collection electrodes 41 . The dust collection section 40 of this example has seven dust collection electrodes 41 (dust collection electrodes 41-1 to 41-7).

The dust collection electrode 41 may be plate-shaped. In this example, the plate surface of the plate-shaped dust collection electrode 41 is arranged parallel to the XZ plane. The dust collection electrode 41 may be provided with a plurality of openings 42 through which the exhaust gas 30 passes. The opening 42 penetrates the plate surface in the thickness direction (Y-axis direction) of the plate-shaped dust collection electrode 41 . In this example, the exhaust gas 30 passes through the inside of the dust collection part 40 in a direction intersecting the plate surface of the dust collection electrode 41 . In this example, the exhaust gas 30 passes through the inside of the dust collection section in the direction from the dust collection electrode 41-1 to the dust collection electrode 41-7.

One of the adjacent dust collection electrodes 41 may be connected to the power supply 43 and the other may be grounded. In this example, the dust collection electrode 41-1, the dust collection electrode 41-3, the dust collection electrode 41-5 and the dust collection electrode 41-7 are connected to the power source 43, and the dust collection electrode 41-2 and the dust collection electrode 41 -4 and the collecting electrode 41-6 are grounded. The charged particulate matter 32 (see FIG. 4) is collected by the grounded dust collection electrode 41 due to the potential difference generated between the adjacent dust collection electrodes 41 . In this example, the collected particulate matter 32 falls into the collecting section 10 .

The dust collection electrode 41 may have a second concave portion 44 . In this example, the second concave portion 44 is recessed in the thickness direction of the plate-like dust collection electrode 41 plate surface. The second concave portion 44 is recessed in a direction (Y-axis direction in this example) intersecting the direction from the collecting portion 10 to the dust collecting portion 40 (Z-axis direction in this example).

FIG. 18 is an enlarged view of the dust collection electrode 41 in FIG. FIG. 18 is a diagram of one dust collection electrode 41 viewed in the thickness direction of the plate surface. The second concave portion 44 may have a rectangular shape having long sides 45 and short sides 46 when the dust collection electrode 41 is viewed in the thickness direction of the plate surface. The long side 45 of the second concave portion 44 may intersect the direction from the collecting portion 10 to the dust collecting portion 40 (the Z-axis direction in this example). In this example, the long side 45 is perpendicular to the direction from the collecting portion 10 to the dust collecting portion 40 . The second concave portion 44 may be arranged between the collecting portion 10 and the opening 42 in the direction from the collecting portion 10 to the dust collecting portion 40 .

FIG. 19 is another enlarged view of the dust collection electrode 41 in FIG. FIG. 19 is a diagram of one dust collection electrode 41 viewed in a direction parallel to the plate surface. The second concave portion 44 of this example is recessed in the thickness direction of the plate surface when the dust collection electrode 41 is viewed in a direction parallel to the plate surface. The depth from the plate surface of the second recess 44 is defined as depth dp2.

The depth dp2 may be 1/4 of the wavelength of the microwave 93 (see FIG. 3, etc.). As a result, above the second concave portion 44, microwaves 93 traveling in the direction from the collecting portion 10 to the dust collecting portion 40 and microwaves 93 traveling in the direction from the dust collecting portion 40 to the collecting portion 10 and cancel each other out. Since the depth dp2 is 1/4 of the wavelength of the microwaves 93, the reflectance of the microwaves 93 reflected from the second concave portion 44 toward the collecting portion 10 can be easily improved. This facilitates efficient combustion of the particulate matter 32 in the collecting section 10 .

As described above, the second concave portion 44 may be arranged between the collecting portion 10 and the opening 42 in the direction from the collecting portion 10 to the dust collecting portion 40 . This makes it difficult for the microwaves 93 to travel toward the opening 42 side of the second concave portion 44 . The second concave portion 44 may have a so-called choke structure that cancels out the traveling wave and the reflected wave of the microwave 93 .

FIG. 20 is a diagram showing an example of the arrangement of the electrostatic precipitator 100. FIG. Exhaust gas 30 discharged by power plant 92 passes through pipe 110 . The charging unit 90 and the dust collection unit 40 may be provided in the pipe 110 through which the exhaust gas 30 passes. The charging unit 90 and the dust collection unit 40 may be provided in the flow path of the exhaust gas 30 inside the pipe 110 . In FIG. 20, the range of the electrostatic precipitator 100 is indicated by a dashed line frame. The charging unit 90 may be provided upstream of the flow path of the exhaust gas 30 in the pipe 110 relative to the dust collection unit 40 . As a result, the particulate matter 32 charged by the charging section 90 is collected by the dust collection section 40 .

The collection unit 10 may be arranged below the pipe 110 . The propagation section 20 may be arranged below the pipe 110 . Particulate matter 32 may be combusted outside piping 110 by microwaves 93 (see FIG. 3).

Although the present invention has been described above using the embodiments, the technical scope of the present invention is not limited to the scope described in the above embodiments. It is obvious to those skilled in the art that various modifications and improvements can be made to the above embodiments. It is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

The execution order of each process such as actions, procedures, steps, and stages in devices, systems, programs, and methods shown in claims, specifications, and drawings is etc., and it should be noted that they can be implemented in any order unless the output of a previous process is used in a later process. Regarding the operation flow in the claims, specification, and drawings, even if explanations are made using "first," "next," etc. for the sake of convenience, it means that it is essential to carry out in this order. is not.

DESCRIPTION OF SYMBOLS 10... Collection part, 11... Bottom plate, 12... Side plate, 13... Outer surface, 14... Inner surface, 15... Side plate, 16... Outer surface, 17... Inner surface 18 Side plate 19 Outer surface 20 Propagation part 21 Internal space 22 First microwave introduction port 23 Outer plate 24 Top plate 25 Outer bottom plate 26 Inner surface 27 Upper surface 30 Exhaust gas 32 Particulate matter 33 Outer plate 36 Inner surface 40 Dust collection part 41 Dust collection electrode 42 Opening 43 Power supply 44 Second recess 45 Long side 46 Short side 50 First concave portion 60 Microwave introduction pipe 61 Second microwave introduction port 62 Microwave introduction pipe 63 Third microwave introduction port 80 ... first slit 81 long side 82 short side 83 covering material 84 convex portion 86 lower surface 87 upper surface 88 second slit, 90 charging section, 91 microwave generating section, 92 power unit, 93 microwave, 94 microwave introduction tube, 96 upper surface, 97... Collection space, 98... Lower surface, 99... Inner surface, 100... Electrostatic precipitator, 110... Piping, 200... Electrostatic precipitator system

Claims

a collection unit having a bottom plate on which particulate matter contained in the exhaust gas accumulates, the bottom plate being provided with a plurality of first slits;
a propagation part having an internal space in which microwaves propagate;
with
When viewed from above, the plurality of first slits are arranged at positions overlapping with the internal space,
The microwave propagates from the internal space through the plurality of first slits to the collecting section,
Electrostatic precipitator.
a charging unit that charges the particulate matter;
a dust collection unit that collects the charged particulate matter;
further comprising
The collecting unit is arranged below the dust collecting unit,
The particulate matter collected by the dust collection unit is deposited on the bottom plate.
The electrostatic precipitator according to claim 1.
The propagating portion is separated from the plurality of first slits by a predetermined distance in a first direction that is an in-plane direction of the bottom plate and a direction that intersects the long sides of the plurality of first slits. Having a first microwave inlet provided,
The microwave is introduced into the internal space through the first microwave introduction port,
The larger the distance from the first microwave introduction port to one of the plurality of first slits in the first direction, the greater the width of each of the plurality of first slits in the first direction. big,
The electrostatic precipitator according to claim 2.
The propagating portion is separated from the plurality of first slits by a predetermined distance in a first direction that is an in-plane direction of the bottom plate and a direction that intersects the long sides of the plurality of first slits. Having a first microwave inlet provided,
The microwave is introduced into the internal space through the first microwave introduction port,
The larger the distance from the first microwave introduction port to one of the plurality of first slits in the first direction, the more adjacent one of the plurality of first slits in the first direction. The distance between the first slit of and the other first slit is small,
The electrostatic precipitator according to claim 2.
The collecting part further has a first side plate that intersects with the bottom plate, faces the internal space, and is arranged furthest apart from the first microwave introduction port in a top view,
The first side plate is provided with a second slit,
The electrostatic precipitator according to claim 3 or 4.
The electrostatic precipitator according to any one of claims 3 to 5, wherein the width of the propagating portion in the direction intersecting the first direction spreads from the first microwave introduction port to the plurality of first slits. Device.
7. The apparatus according to any one of claims 3 to 6, wherein the propagation section further includes an outer plate facing the internal space and extending in the first direction when viewed from above, and a second microwave introduction port provided in the outer plate. The electrostatic precipitator according to any one of the items.
8. The propagating section further includes an outer bottom plate facing the internal space and provided below the bottom plate, and a third microwave introduction port provided in the outer bottom plate. The electrostatic precipitator according to item 1.
A microwave introduction pipe through which microwaves introduced into the internal space from the outside of the propagating portion pass is connected to the first microwave introduction port,
The microwave introduction pipe has a first recess recessed in a direction intersecting the traveling direction of the microwave,
The depth of the first recess is 1/4 of the wavelength of the microwave,
The electrostatic precipitator according to any one of claims 3 to 8.
The dust collection part has a dust collection electrode,
The dust collection electrode has a second concave portion recessed in a direction intersecting a direction from the collection portion to the dust collection portion,
The depth of the second recess is 1/4 of the wavelength of the microwave,
The electrostatic precipitator according to any one of claims 2 to 9.
The charging unit and the dust collection unit are provided in a pipe through which the exhaust gas passes,
The collection unit is arranged below the pipe,
The electrostatic precipitator according to any one of claims 2 to 10.
The collection part further has a second side plate that intersects with the bottom plate and faces the internal space,
The plurality of first slits are provided extending from the bottom plate to the second side plate,
The electrostatic precipitator according to any one of claims 1 to 11.
The electrostatic precipitator according to any one of claims 1 to 12, further comprising a coating material provided on the upper surface of said bottom plate and covering at least one first slit among said plurality of first slits.
The electrostatic precipitator according to claim 13, wherein the covering material is provided inside the at least one first slit.
The electrostatic precipitator according to claim 14, wherein the upper surface of the covering material is provided with a depression corresponding to the first slit.
The electrostatic precipitator according to any one of claims 13 to 15, wherein the covering material is removable from the upper surface of the bottom plate.