JP2003019413A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector having a filter holding plate which is stiff and bends less in site of the non-metallic filter supporting plate. SOLUTION: This dust collector is constituted by installing a filter holding plate 8 having a plurality of filter slots 9 into a vessel 2 and holding the flanged sections 10a of flanged cylindrical ceramic filters 10 by the edges of the filter slots 9. A plurality of fluid passages 4 are formed in the vessel 2 by a supporting frame 3 made of ceramics disposed in the vessel 2 and the filter supporting plate 8 made of the ceramics which has the size enough to cover these fluid passages 4 and has a plurality of the filter slots 9 is supported by the supporting frame 3 made of the ceramics and the vessel 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collector for removing fine particles such as soot and dust contained in exhaust gas.

[0002]

2. Description of the Related Art As a dust collector for removing fine particles such as soot and dust contained in exhaust gas, a metal filter support plate having a plurality of filter insertion holes is installed in a can and the edge of the filter insertion hole is installed. There is known a dust collector which holds a flange portion of a sintered ceramic tube filter.

[0003]

In the conventional dust collector, since the flange portion of the sintered ceramic tube filter is held by the edge of the filter insertion hole formed in the metal filter support plate, the sintered ceramic tube filter and the metal There is a problem that the flange portion of the sintered ceramic tube filter is easily damaged by the thermal stress due to the difference in expansion coefficient from the filter support plate.

Further, when fine particles such as ash and dust contained in the exhaust gas of a refuse incinerator adhere to the hot metal filter support plate, there is a problem that the corrosion rate of the metal filter support plate is accelerated. It was

Therefore, it is conceivable to use a ceramic filter support plate instead of the metal filter support plate. However, the filter support plate is different from the sintered ceramic tube filter and the load of the filter support plate itself. Since pressure acts on the filter support plate, it is necessary to make the filter support plate very thick in order to provide the filter support plate with a predetermined strength, which is one of the causes of cost increase.

The present invention has been made in order to solve such a problem, and one of the objects thereof is that the filter support plate is made of a non-metallic material, but it has a high rigidity and little bending. It is to provide a dust collector having a filter support plate.

[0007]

In order to solve the above problems, the present invention is configured as follows.

(1) In a dust collector in which a filter support plate having a plurality of filter insertion holes is installed in a can and the flange portion of a cylindrical ceramic filter with a flange is held by the edge of the filter insertion hole. A ceramic filter support plate having a plurality of fluid passages formed in a can by a ceramic support frame provided therein, having a size sufficient to cover the fluid passages, and having a plurality of filter insertion holes. A dust collector supported by the ceramic support frame and the can.

(2) The dust collector according to (1), characterized in that the lower surface of the ceramic support frame is formed in an arch shape.

(3) A dust collector in which a filter support plate having a plurality of filter insertion holes is installed in a can, and the flange portion of a cylindrical ceramic filter with a flange is held by the edge of the filter insertion hole. The support plate is formed of a plurality of ceramic tubes arranged in a plane and a ceramic adhesive / filler filled in the gaps between the tubes, and is made of ceramic having a filter insertion hole on the filter support plate. A dust collector having a filter mounting plate mounted thereon.

(4) In the dust collector according to (3), a ceramic sheet is interposed between the ceramic filter support plate and the ceramic filter mounting plate.

(5) The dust collector according to (3) or (4), characterized in that the flange portion of the cylindrical ceramic filter with a flange is fixed to the filter support plate by a fastener made of ceramic.

Here, the filter support plate is formed by laminating a plain woven fabric woven from one or more fibers selected from the group consisting of silicon carbide, silicon nitride, alumina, alumina-silica, and carbon. It is preferable to form a coating layer on the fiber surface by a vapor deposition method of one or more selected from the group consisting of silicon carbide, silicon nitride, alumina, and carbon.

Further, as the ceramic sheet, a fiber formed body composed of one or more fibers selected from the group consisting of silicon carbide, silicon nitride, alumina, alumina-silica, and carbon is preferable.

Further, the filter, like the filter support plate, is a fiber-formed body composed of one or more fibers selected from the group consisting of silicon carbide, silicon nitride, alumina, alumina-silica, and carbon. It is preferable that a coating layer formed by a vapor deposition method of one or more selected from the group consisting of silicon carbide, silicon nitride, alumina, and carbon is formed on the surface of the fiber.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. (A) First Embodiment FIG. 1 is a cross-sectional view of a dust collector according to the present invention, and FIG. 2 is an enlarged perspective view of a main part thereof.

In FIG. 1, 1a is a dust collector, 2 is a can thereof, and the can 2 is composed of a front chamber 2a and a rear chamber 2b. Moreover, a plurality of fluid passages 4 are formed by the support frame 3 at the upper end of the front chamber 2a. Support frame 3
Is attached to the front chamber 2a in a cross shape (see FIG. 2), and the first support frame 3a is held by the grooves 6 and 6 provided in the castable (fireproof heat insulating wall) 5 of the front chamber 2a, The support frame 3b is held by the groove 6 provided in the castable 5 of the front chamber 2a and the groove 7 provided in the first support frame 3a.

The first and second support frames 3a and 3b are attached so that their upper surfaces are flush with the upper surface of the front chamber 2a. Further, the lower surfaces of the first and second support frames 3a and 3b are each formed in an arch shape so as to ensure an exhaust gas inflow path. The first and second support frames 3a and 3b are made of a fire-resistant brick or a material having high fire resistance such as a ceramic plate.

As shown in FIG. 2, the filter support plate 8 is
It is formed in a rectangular shape sufficient to cover the fluid passage 4 and has a large number of filter insertion holes 9, the periphery of which is
It is supported by the second support frames 3a, 3b and the fireproof heat insulating wall 5 of the front chamber 2a.

The filter support plate 8 is a ceramic plate, that is, a fiber binder (acetone: phenol resin = 2:
1 (weight ratio)) of a predetermined number of plain woven fabrics made of silicon carbide fibers are laminated and cured by autoclaving, and then heated at 900 ° C. in a nitrogen gas atmosphere to form a fiber binder. The funnel-shaped flange portion 10 of the tubular fiber-reinforced ceramic filter 10 with a flange, which is made of carbonized carbon and then vapor-deposited with silicon carbide by a vapor deposition method (CVD method) and is inserted into the filter insertion hole 9.
a is held by the edge of the filter insertion hole 9 (see FIG. 1).

The flanged tubular fiber reinforced ceramic filter 10 is formed of a silicon carbide composite material reinforced with silicon carbide fibers. In the funnel-shaped flange portion 10a of the tubular fiber-reinforced ceramic filter 10 with a flange,
A donut-shaped weight 11 is placed to prevent the filter from floating.

A gas inlet 12 is provided in the front chamber 2a, and a gas outlet 13 is provided in the rear chamber 2b. Next, the operation of the dust collector will be described.

As shown in FIG. 1, high temperature exhaust gas a discharged from a general refuse incinerator (not shown) is introduced into the front chamber 2a from a gas inlet 12 provided in the front chamber 2a of the can 2. And is filtered by the cylindrical fiber-reinforced ceramic filter 10 made of a silicon carbide composite material. The cylindrical fiber-reinforced ceramic filter 4 removes fine particles such as soot and dust, and only purified and clean high-temperature exhaust gas a ′ is formed in the can portion 2
It is supplied from a gas outlet 13 provided in the rear chamber 2b to a waste heat recovery device (not shown).

(B) Second Embodiment FIG. 3 is a sectional view showing another example of the dust collector according to the present invention, and FIG. 4 is a plan view including a partial cross section of the filter support plate,
FIG. 5 is a sectional view taken along line AA ′ of FIG.

In FIG. 3, 1b is a dust collector, 2 is a can thereof, and the can 2 is composed of a front chamber 2a and a rear chamber 2b, and a filter support plate 80 and a sheet are provided at the upper end of the front chamber 2a. 20 and the flange mounting plate 18 are installed in this order.

As shown in FIGS. 4 and 5, the filter support plate 80 has a large number of tubes 15 having a predetermined inner diameter D and a length (height) L arranged in a plane at predetermined intervals and adjacent to each other. It is a flat plate shape in which a gap 16 between the tubes 15 is filled with a ceramic adhesive / filler 17 such as fiber castable and adjacent tubes 15 are joined together, and the tubes 15 are filter insertion holes.

As shown in FIG. 6, on the filter support plate 80, the sheet 20 having the filter insertion hole 29 and the filter mounting plate 18 having the filter insertion hole 19 are placed in this order, and the filter mounting plate 80 is placed. The flange portion 10 a of the tubular fiber-reinforced ceramic filter 10 with a flange is held by the edge of the filter insertion hole 18 of 18.

Like the filter support plate 8 of the first embodiment, the filter mounting plate 18 is made of a silicon carbide fiber flat plate impregnated with a fiber binder (acetone: phenol resin = 2: 1 (weight ratio)). A predetermined number of woven fabrics are laminated, cured by autoclave treatment, and then heated at 900 ° C. in a nitrogen gas atmosphere to carbonize the fiber binder, and then vapor deposition (CVD method) on the fiber surface. More silicon carbide is vapor-deposited.

The sheet 20 is formed of a ceramic fiber molded body such as alumina / silica fiber, and the flanged tubular fiber reinforced ceramic filter 10 is formed of a silicon carbide composite material reinforced with silicon carbide fibers.

A doughnut-shaped weight 11 is placed on the funnel-shaped flange 10a of the tubular fiber-reinforced ceramic filter 10 with a flange in order to prevent the filter from floating.

Further, the front chamber 2a is provided with a gas inlet 12 and the rear chamber 2b is provided with a gas outlet 13. The operation of the dust collector 1b is almost the same as that of the dust collector 1a of the first embodiment, and thus the description thereof will be omitted.

Further, the filter 10 and the filter insertion hole 9,
To prevent the exhaust gas leakage from 19, 29, for example,
As shown in FIG. 7, the donut-shaped packing 23 a is placed under the flange portion 10 a of the filter 10, and the donut-shaped packing 23 b placed on the flange portion 10 a of the filter 10 is pressed by the filter pressing plate 21. Good. The tightening of the filter pressing plate 21 is performed by a bolt nut 22 made of ceramics.

Here, the filter pressing plate 21 is made of the same material as the filter mounting plate 18, and a fluid passage 21a is provided in the center thereof. Also, packing 23
The a and 23b are made of the same material as the sheet 20.

[0034]

(Example) (Example 1) (1) Place of dust collector: high temperature dust collection area of a general refuse incinerator (exhaust gas temperature 700 ° C) (2) Structure of support frame: cement refractory bricks with a width of 100 mm and a thickness of 100 mm It is a wall-like object that is stacked by being bonded with the above, and the lower part is arched to secure the inflow passage of the exhaust gas. (3) Filter support plate: silicon carbide composite material reinforced with silicon carbide fiber / fiber: silicon carbide fiber (Nicalon ) Laminated plain woven fabric ・ Base material: Silicon carbide deposited by vapor deposition ・ Dimension: 440 mm × 940 mm × 10 mm ・ 60 holes with a diameter of 64 mm opened at 80 mm pitch (4) Situation after use: No damage to filter support plate and filter even after 20,000 hours (5) Cost: 44 (compared to the cost of 100 in Comparative Example 1)

(Comparative Example 1) (1) Place of installation of dust collector: high temperature dust collection area of general refuse incinerator (exhaust gas temperature 700 ° C.) (2) Support frame structure: None (3) Filter support plate: silicon carbide fiber Reinforced silicon carbide composite material ・ Fiber: Lamination of plain woven fabric made of silicon carbide fiber (Nicalon) ・ Base material: Silicon carbide deposited by vapor deposition ・ Dimension: 4620 mm × 4620 mm × 50 mm ・ Diameter 64 mm hole 3136 openings at 80 mm pitch (4) Situation after use: No damage to filter support plate or filter even after 20,000 hours (5) Cost: 100

(Example 2) (1) Place of installation of dust collector: high temperature dust collection area of a general refuse incinerator (exhaust gas temperature 700 ° C) (2) filter support plate (a) tube material: silicon carbide fiber reinforced silicon carbide composite Material / fiber: Silicon carbide fiber (Nicalon) / Base material: Silicon carbide deposited by vapor deposition method Dimensions: Inner diameter 64 mm, outer diameter 66 mm, length 50 mm (b) Focusing ceramic adhesive / filler: Fiber Castable (c) tube sheet dimensions: 4620 mm x 4620 mm x 50 m
m (3) Filter mounting plate: Silicon carbide composite material reinforced with silicon carbide fiber / fiber: Lamination of plain woven fabric made of silicon carbide fiber (Nicalon) / Base material: Silicon carbide deposited by vapor deposition method Method: 4620 mm × 4620 mm × 50 mm ・ Open 3136 holes with a diameter of 64 mm at a pitch of 80 mm (4) Situation after use: No damage to filter support plate, filter mounting plate and filter even after 20,000 hours (5) Cost: 63 (compared to the cost of 100 in Comparative Example 2)

(Comparative Example 2) (1) Place of installation of dust collector: high temperature dust collection area of general refuse incinerator (exhaust gas temperature 700 ° C.) (2) Filter support plate: silicon carbide composite material / fiber reinforced with silicon carbide fibers : Lamination of plain woven fabric made of silicon carbide fiber (Nicalon) -Base material: Silicon carbide deposited by vapor deposition method-Dimensions: 4620 mm x 4620 mm x 50 mm-3136 holes with a diameter of 64 mm at 80 mm pitch (3 ) Condition after use: No damage to filter support plate, filter mounting plate and filter even after 20,000 hours have passed. (4) Cost: 100

Example 3 (1) Cylindrical Ceramic Filter (2) Material: Fiber Reinforced Ceramic Filter Fiber: Silicon Carbide Fiber (Nicalon) Base Material: Silicon Carbide Vapor Deposition (3) ) Shape: Cylindrical fiber reinforced ceramic filter with flange (4) Filter support plate (a) Tube material: Silicon carbide fiber reinforced silicon carbide composite material Fiber: Silicon carbide fiber (Nicalon) Base material: Vapor deposition Silicon carbide precipitated by the method ・ Dimensions: Inner diameter 64 mm, outer diameter 66 mm, length 50 mm ・ Mounting part: taper 15 °, taper part length (axial direction) 5 m
m (b) Focusing ceramic adhesive / filler / fiber castable (c) Filter support plate Dimensions: 4620 mm x 4620 m
m × 50 mm (5) Filter mounting plate: Silicon carbide composite material reinforced with silicon carbide fiber / fiber: Lamination of plain woven fabric made of silicon carbide fiber (Nicalon) / Base material: Silicon carbide deposited by vapor deposition method・ Dimension: 4620mm × 4620mm × 3mm ・ 3136 holes with 66mm diameter at 80mm pitch ・ Mounting part: Taper 15 ° (6) Filter holding plate ・ Material: Same as (5) ・ Dimension: 80mm × 160mm × 3mm ・ Bolt hole: 4 locations with a diameter of 8mm (7) Bolts, nuts and materials: Same as (5) ・ Dimensions (mm): M8 (8) Place of dust collector: High temperature dust collection area of general waste incinerator (Exhaust gas temperature 700 ° C.) (9) Situation after use: During use period of 20,000 hours,
Both the filter mounting plate and the filter did not float, and no dust leaked.

[0039]

As described above, according to the present invention, a filter supporting plate having a plurality of filter insertion holes is installed in a can, and the flange of the flanged tubular ceramic filter is held by the edges of the filter insertion holes. In the dust collector configured as described above, a plurality of fluid passages are formed in the can by the ceramic support frame provided in the can, the fluid passage has a size sufficient to cover the fluid passages, and a plurality of filter insertion holes are provided. Since the ceramic filter support plate that is provided is supported by the ceramic support frame and the can, a relatively small ceramic filter support plate can be used, and the dust collector manufacturing cost can be reduced. . Further, since the ceramic filter is held by the ceramic filter support plate, it is possible to reduce damage to the ceramic filter.

The present invention also provides a dust collector in which a filter support plate having a plurality of filter insertion holes is installed in a can and the flange portion of a cylindrical ceramic filter with a flange is held by the edge of the filter insertion hole. The filter support plate is formed of a plurality of ceramic tubes arranged in a plane and a ceramic adhesive / filler filled in the gaps between the tubes, and a filter insertion hole is provided on the filter support plate. Since a ceramic filter mounting plate is placed, it has a large load resistance,
In addition, it becomes possible to manufacture a thick filter support plate at low cost. Further, since the ceramic filter is held by the ceramic filter support plate, it is possible to reduce damage to the ceramic filter. .

Further, by fixing the flange portion of the tubular ceramic filter with a flange to the filter support plate with a ceramic fastener, it is possible to prevent the exhaust gas from leaking from the gap between the filter and the filter mounting plate. became.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of a dust collector according to the present invention.

FIG. 2 is a perspective view of a front chamber.

FIG. 3 is a sectional view showing a second embodiment of the dust collector according to the present invention.

FIG. 4 is a plan view of a filter support plate.

5 is a cross-sectional view taken along the line AA ′ of FIG.

FIG. 6 is a cross-sectional view of a filter support plate, a sheet, and a filter mounting plate.

FIG. 7 is a cross-sectional view showing a method for preventing leakage of exhaust gas.

[Explanation of symbols]

1 dust collector 2 cans 3 support frames 4 fluid passages 8 Filter support plate 9 Filter insertion hole 10 Cylindrical ceramic filter with flange 10a Flange part

Claims (5)

[Claims] 1. A dust collector in which a filter support plate having a plurality of filter insertion holes is installed in a can, and a flange portion of a cylindrical ceramic filter with a flange is held by an edge of the filter insertion hole. A ceramic filter support plate having a plurality of fluid passages formed in the can by a ceramic support frame provided in the can, having a size sufficient to cover the fluid passages, and having a plurality of filter insertion holes; A dust collector supported by a ceramic support frame and the can. 2. The dust collector according to claim 1, wherein the lower surface of the ceramic support frame is formed in an arch shape. 3. A dust collector in which a filter support plate having a plurality of filter insertion holes is installed in a can, and a flange portion of a cylindrical ceramic filter with a flange is held by an edge of the filter insertion hole. A plate made of a plurality of ceramic tubes arranged in a plane and a ceramic adhesive / filler filled in the gaps between the tubes, and a ceramic filter having filter insertion holes on the filter support plate. A dust collector characterized by mounting a mounting plate. 4. The dust collector according to claim 3, wherein a ceramic sheet is interposed between the ceramic filter support plate and the ceramic filter mounting plate. 5. The dust collector according to claim 3, wherein the flange portion of the cylindrical ceramic filter with a flange is fixed to the filter supporting plate by a fastener made of ceramic.