JPH0929030A - Dust removing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust removing device for installing and removing filters respectively set in chambers and ensure the sealing in a good manner. SOLUTION: When filters 5 disposed in the hand-joining shape by assembling the same into a crest type are disposed vertically in respective chambers 3a-3e in which exhaust gas is flowed from below to above, the lower end of a filter component is inserted into one channel section of a guide component of channel steel fixed on the lower sections of chambers 3a-3e side of an interstructure 2 or side plates and pushed in the horizontal direction to install the filter 5 in either one the chambers 3a-3e and also remove the same therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust remover, and particularly to a dust remover which is useful when applied to a filter in which a vertically arranged filter for circulating exhaust gas from the lower side to the upper side is horizontally moved to be arranged indoors. Is.

[0002]

2. Description of the Related Art Soot dust is contained in exhaust gas emitted from a boiler device, a refuse incinerator, or the like. Therefore, in order to prevent air pollution, the boiler device or the like is provided with a dust removing device for removing (collecting) soot dust.

The following is known as a conventional dust removing device used in a boiler device or the like. (1) Centrifugal dust collector This centrifugal dust collector uses centrifugal force to give a large acceleration (swirl speed) to the exhaust gas to separate the soot dust from the gas. As a practical matter, it is a cyclone. Type dust collectors are known. A centrifugal force dust collector represented by a cyclone type dust collector uses centrifugal force to remove dust.
If the particle size of soot and dust contained in the gas is larger than a certain size, the soot and dust cannot be collected.

(2) Filtration type dust collector The filtration type dust collector collects soot dust by filtering exhaust gas with a filter cloth using Teflon fiber or glass fiber, and is known as a bag filter. . With this filter type dust collector,
The dust collection chamber is divided into a plurality of chambers, and the dust collected is sequentially removed in each chamber. As a method of removing the liquid, there are a mechanical vibration type, a reverse pressure removing type, a pulse jet type and the like. It should be noted that the bag filter requires an extremely large number of bugs because it is necessary to make the gas flow velocity passing through the bag extremely slow.

(3) Electrostatic precipitator In the electrostatic precipitator, the corona discharge around the discharge electrode is used to give an electric charge to the soot particles in the gas, and the charged particles are subjected to the Coulomb force to the dust collecting electrode. Suction dust is collected. In the electrostatic precipitator, unless the particle size of soot dust or the like is large to some extent, the soot dust cannot be collected and a large amount of power is consumed.

By the way, in remote islands and the like, power is generated by diesel power generation equipment. In this diesel power plant,
A diesel engine rotates the generator. Of course, the exhaust gas emitted from the diesel engine also contains soot and dust, but at present, most of the time, diesel power generation equipment is not equipped with a dust remover. The reason is as follows.

The particle size of the dust particles contained in the exhaust gas emitted from the diesel engine is extremely small (see FIG. 10), while the centrifugal force dust collector, the filter type dust collector and the electric dust collector have about 1 particle size.
Unless the dust has a particle size of [μm] or more, it cannot be collected, and even if these conventional dust collectors are provided, the dust removal efficiency is extremely poor.

Further, even if the dust removal efficiency is poor, even if the above conventional dust collector is provided in order to reduce the amount of soot emission as much as possible, a large flow (passage) resistance is added to the exhaust gas, resulting in a large pressure loss and a diesel engine. There is a demerit that the efficiency of the engine is reduced (especially when a bag filter is used), and generated electric power is consumed for dust removal (especially in the case of an electric dust collector).

Therefore, the inventors of the present application have developed and applied for a patent for a dust remover capable of collecting soot and dust having a small particle size and having a low pressure loss and low power consumption (Japanese Patent Application No. 2-1473:
This is hereinafter referred to as the "first application").

Here, the outline of the dust removing device of the prior application will be described with reference to FIG. As shown in the figure, the inside of the casing 01 is partitioned by a partition plate 02 to form five channels 03. Each flow path 03 is provided with a damper 06, a heater 07, and a filter 08 in order from the inlet side (inlet gas duct 04 side) toward the outlet side (outlet gas duct 05 side). The damper 06 is rotated by a motor (not shown) to open / close the flow path 03. The heater 07 receives heat to generate heat and regenerates the filter 08. In other words, the filter 08 is heated to burn the soot and dust collected by the filter 08 (such as the soot and the fuel mist generated by the scattering of the lubricating oil). Further, the filter 08 is formed of a ceramic porous body.

The exhaust gas is sent from the inlet gas duct 04 into the casing 01. To collect soot and dust in exhaust gas,
The damper 06 is opened without passing a current through the heater 07. By doing so, the exhaust gas passes through the filter 08, and soot and dust are collected by the filter 08. The exhaust gas that has passed through the filter 08 is sent to the chimney via the outlet gas duct 05.

Regeneration of the filter 08 is periodically performed by sequentially shifting the phase for each flow path 03. This reproducing method will be described with reference to FIG. In order to distinguish each flow path 03, the flow paths are denoted by reference numerals 03-1, 03-2, 03- here.
3, 03-4, 03-5 will be described.

As shown in FIG. 12, in the period T ₁ , the flow passage 0
Regeneration in 3-1 and the flow paths 03-2, 03-3, 03-
Soot and dust are collected by 4,03-5. That is, the flow path 03
In -1, the damper 06 is closed and a current is passed through the heater 07 to heat the filter 08 to regenerate the filter, and in the other flow paths 03-2, 03-3, 03-4, 03-5, the damper 06. Open the filter 0 without passing current to the heater 07
Collect soot and dust by 8. In the period T ₂ , the flow path 03-2
In the other flow path, soot is collected in the other flow path, and in the period T ₃ , it is collected in the flow path 03-3 and is collected in the other flow path. While collecting, collect in another channel.

[0014]

In the above-mentioned prior art, as shown in FIG. 11, the exhaust gas is configured to flow horizontally from the inlet side to the outlet side, but it is allowed to flow vertically from bottom to top. Is rational. This is because the exhaust gas rises even in the uncompressed natural state.

Therefore, it is necessary to install the filter, which is formed in a mountain shape and is arranged in a palm-arrangement, in a vertical arrangement in a chamber for removing dust, and at the same time, the filter can be taken in and out of the chamber. At the same time, it is necessary to consider the seal between the upper and lower parts of the chamber bounded by the filter.

In view of the above-mentioned prior art, it is an object of the present invention to provide a dust remover capable of easily putting a filter in and out of a chamber and ensuring a good seal.

[0017]

The structure of the present invention for achieving the above object is characterized by the following points.

(1) A chamber through which exhaust gas flows from the lower inlet side toward the upper outlet side is connected to the tops of two flat plate-shaped filter members made of a ceramic porous body, and the filter members are directed downward. Is formed in a mountain shape so as to gradually increase the interval, and is placed in the interior of the chamber, and the filter that collects the soot and dust in the exhaust gas flowing from the bottom to the top and the lower end of the filter member are in contact with each other, and the filter is horizontal. And horizontal guide members fixed to the inside of the vertical wall surfaces facing each other of the chamber so that the chambers can be housed in the chamber by sliding contact with each other.

(2) In (1), the guide member is made of grooved steel having a C-shaped cross section, and the lower end of the filter member is inserted into the groove.

(3) In (1), the filter member is
The guide member is formed of a flat plate having a horizontal surface at the lower end thereof, which projects outward in the horizontal direction, and is fixed between the flat plate and another flat plate which is fixed to the wall surface above the flat plate and extends horizontally. It is configured to insert the above flange portion.

(4) In (3), a push bolt is screwed on the other flat plate, and the flange portion is pressed against the guide member by the tip of the push bolt.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing the dust removing apparatus according to this embodiment with a part thereof broken away. In this dust removing device, four partition plates 2 are provided in the casing 1 in the vertical direction, and five chambers 3a to 3e are formed in the casing 1. Each room 3a ~
Reference numeral 3e extends in the vertical direction, and a heater 4 (described later in detail) and a filter 5 (described later in detail) are provided therein.

Inlet gas ducts 6a to 6e are connected to the front sides of the lower portions of the chambers 3a to 3e, respectively. Inlet gas ducts 6a to 6e are opened and closed by driving motors 7a to 7e. ~ 8e are provided.
Further, outlet gas ducts 9a to 9e are connected to the rear sides of the upper portions of the chambers 3a to 3e, respectively, and outlet dampers 11a to 11e opened and closed by driving the motors 10a to 10e are provided in the outlet gas ducts 9a to 9e. (In the figure, 11b
~ 11e are not visible). Exhaust gas emitted from the diesel engine, etc.
Each of the chambers 3a to 3e is guided through a to 6e
After passing through 3e from the bottom to the top, the gas is discharged via the outlet gas ducts 9a to 9e and sent to the chimney.

The filter 5, as shown in FIG.
A structure in which one filter member 5-1 and one filter element 5-2 are arranged in a palm,
That is, it has a vertical structure in which the upper side is connected and opens so that the gap between the two gradually increases toward the lower side, and the exhaust gas flows from the lower side to the upper side. Each of the filter members 5-1 and 5-2 has a structure in which the ceramic porous body 5b is incorporated in the frame member 5a. This ceramic porous body 5b is made of cordierite (2MgO.Al ₂ O).
It is a mixture of ₃ · 5SiO ₂ ) and alumina (Al ₂ O ₃ ), has 10 to 15 holes per inch, and has a high porosity (porosity is 80 to 90%). The thickness of the porous ceramic body 5b (length in the direction in which exhaust gas passes) is 4
It is set to 0 to 60 [mm].

The flow velocity of the exhaust gas (exhaust gas emitted from the diesel engine) flowing through the chambers 3a to 3e is 0.5 to 2 [m /
Seconds], but the ceramic porous body 5b has a three-dimensional skeleton structure and has a large porosity, so that the pressure loss is small. Further, the diameter of the holes of the ceramic porous body 5b is as large as several [mm], but the thickness of the ceramic porous body 5b is 40 to 60 [mm] and there are a plurality of flow paths with continuous pores, so that the dust of micron order is collected. can do. Eventually, the porosity and the thickness of the ceramic porous body 5b were determined so that both characteristics would be good in consideration of the pressure loss and the collection efficiency in which there is a relationship that if one is made good, the other becomes worse. In addition, here, the flow velocity of the exhaust gas in the bag filter is 2 [m
/ Minute], which is extremely slow.

As shown in FIG. 3, the filter member 5-
The angle θ formed by 1 and 5-2 was set to 10 to 30 °. By doing so, the total area of the filter 5 becomes wider than the cross-sectional area of the chamber, which contributes to the reduction of pressure loss.

Further, as shown in FIG. 3, the heaters 4 are arranged in a triangle below the filter 5. When an electric current is passed through the heater 4, the heater 4 is heated, the radiant heat of the heater strikes the ceramic porous body 5b, and the heated air rises and penetrates into the ceramic porous body 5b. As a result, the ceramic porous body 5b can be heated and regenerated.

As shown in FIG. 4, six heaters 4 may be arranged below the filter 5. A three-phase alternating current is supplied to the heaters 4 arranged in a triangular arrangement (FIG. 3) or a six arrangement (FIG. 4).

FIGS. 5 to 7 are views showing the relevant parts extracted to clarify the sliding structure and the fixing structure of the filter 5, and FIG. 5 is a perspective view showing the filter 5 and its related parts partially broken away. 6 is a side view thereof, and FIG. 7 is a front view thereof.

As shown in these figures, the partition plates 2 or the side plates 12 which are vertical wall surfaces of the casing 1 facing each other.
Guide members 13a and 13b formed of horizontally extending channel steel are fixed to the lower portions of the chambers 3a to 3e side.
In the filter 5, the lower end portions of the respective filter members 5-1 and 5-2 are inserted into the groove portions of the guide members 13a and 13b.

The support rods 14a, 14b are members that are supported horizontally at one end by a bracket 15 that hangs down from inside the casing 1 and at the other end supported by the rear wall 1b of the casing 1. , Filter member 5-
Holes 5-1a and 5- formed respectively on the upper portions of 1, 5-2
It is configured so that it can be inserted into 2a.

Thus, when the filter 5 is stored in the chambers 3a to 3e, the front wall 1a of the casing 1 and the bracket 1 are accommodated.
With the 5 removed, the support rod 1 is inserted into the holes 5-1a and 5-2a.
4a and 14b are inserted and the filter member 5-
It suffices to insert the lower parts of 1, 5-2 into the grooves of the guide members 13a, 13b and push the filter 5 horizontally in this state.
When the filter 5 is occupied at a predetermined position, the bracket 15 supports one ends of the support rods 14a and 14b, and the front wall 1a is attached at a predetermined position.

The seal member 16 is a member extending horizontally above the filter 5 with a slight space therebetween, and its both ends fixed to the front wall 1a and the rear wall 1b and extending horizontally.
It has a function of sealing the exhaust gas leaking from the joint of the filter members 5-1 and 5-2. Therefore, the desired sealing effect can be further ensured by inserting the filler into the gap between the top of the filter 5 and the seal member.

Further, the sealing of the exhaust gas in the lower part of the filter 5 is ensured between the groove portions of the guide members 13a and 13b and the filter members 5-1 and 5-2.

According to this embodiment, the chamber 3 of the filter 5 is
In order to take in and out of the a to 3e, the front wall 1a may be removed and the filter 5 assembled in a palm shape may be moved in the horizontal direction with this portion opened.

FIG. 8 is a front view showing another embodiment. As shown in the figure, the guide members 23a and 23b do not need to be limited to the above-mentioned form. It suffices if the filter 25 can support the load via the lower end portion of the filter 25 and can slide in the horizontal direction. Incidentally, the guide members 23a and 23b are flat plates having a horizontal plane and are the partition plate 2 or the side plate 12. It is horizontally fixed to the lower part on the side of the chambers 3a to 3e.

At this time, the filter 25 has almost the same configuration as the filter 5, but the filter members 5-1 and 5 are the same.
-2, the flange portion 25 protruding horizontally outward at the lower end portion
The difference is that it has a and 25b. This flange 25
The filter 25 is placed on the guide members 23a and 23b by the a and 25b contacting the guide members 23a and 23b.

Therefore, a seal for preventing the exhaust gas from leaking in the lower portion of the filter 25 due to the weight of the filter 25 can be used, but flat plates 26a and 26b are provided to further secure the sealing effect. The flat plates 26a and 26b are fixed to the partition plate 2 or the side plate 12 just above the guide members 23a and 23b, similarly to the guide members 23a and 23b.

Thus, the flange portion 25 of the filter 25
a and 25b are the guide members 23a and 23b and the flat plate 26.
It is inserted in the gap between a and 26b.

At this time, a push bolt is screwed onto the flat plates 26a and 26b, and the tip of the push bolt engages the flange portion 25.
The a and 25b may be configured to be pressed against the guide members 23a and 23b. In this case, the sealing of this portion becomes more reliable.

The structure of the heater 4 is as shown in FIG. That is, the heating element 4b is housed in the outer cylinder 4a,
The heating element 4b is supported in a state of penetrating the plurality of disks 4c. A spacer 4d is provided between the disks 4c, and the open end (left end in the figure) of the outer cylinder 4a is sealed by a fireproof and heat-resistant brick 4e. Then, the heating element 4b generates heat by supplying power to the heating element 4b through the lead wire 4f. The heater 4 has its base end (left end in FIG. 9) bolted to the front wall 1a of the casing 1, and its front end (right end in FIG. 9) locked to the rear wall 1b of the casing 1.

[0043]

As described above in detail with the embodiments, according to the present invention, the filter is assembled and removed from the chamber for dust removal of the filter assembled in the mountain shape for the vertical arrangement. This can be easily done by sliding horizontally along the guide member. At the same time, the lower end of the filter is in close contact with the guide member, and the groove of the guide member or another flat plate provided above the guide member allows good sealing of this portion.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a dust remover according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a filter.

FIG. 3 is a front view showing a filter and a heater.

FIG. 4 is a front view showing a filter and a heater.

FIG. 5 is a perspective view showing a filter and its related part with a part thereof broken away.

6 is a side view of FIG.

FIG. 7 is a front view of FIG. 5;

FIG. 8 is a front view corresponding to FIG. 7 showing another embodiment.

FIG. 9 is a cross-sectional view showing a heater.

FIG. 10 is a characteristic diagram showing a dust size and its ratio in diesel exhaust gas.

FIG. 11 is a perspective view showing a conventional dust remover with a part thereof broken away.

FIG. 12 is a time sequence diagram showing a method of operating a conventional dust removing device.

[Explanation of symbols]

 1 Casing 2 Partition Plates 3a to 3e Chamber 5 Filter 5-1 and 5-2 Filter Member 13a, 13b Guide Member

Front page continuation (72) Inventor Tadatoshi Ishigaki 12 Nishikicho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (4)

[Claims] 1. A chamber for flowing exhaust gas from a lower inlet side to an upper outlet side is connected to a top portion of two flat plate-shaped filter members made of a ceramic porous body, and the filter member of the filter member is moved downward. The filters are formed in a mountain shape so that the intervals gradually increase, and are arranged in a palm shape in the room.The filter that collects the dust in the exhaust gas flowing from the bottom to the top is in contact with the lower end of the filter member, and the filter is placed in the horizontal direction. And a horizontal guide member fixed to each inside of the vertical wall surfaces facing each other of the chamber so as to be slidably contacted with and housed in the chamber. 2. The dust remover according to claim 1, wherein the guide member is formed of grooved steel having a C-shaped cross section, and the lower end of the filter member is inserted into the groove. 3. The filter member has a flange portion projecting outward in the horizontal direction at the lower end portion thereof, and the guide member is formed of a flat plate having a horizontal plane, and is fixed to the wall surface above the flat plate to fix it horizontally. The dust removing device according to claim 1, wherein the flange portion is configured to be inserted between the flat plate and another flat plate extending in the direction. 4. A dust removing apparatus according to claim 3, wherein a push bolt is screwed onto the other flat plate, and the flange portion is pressed against the guide member by the tip of the push bolt. .