JPH0929037A - Dust remover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow no heavy stress attributable to a thermal expansion difference to generate in a casing at the time of heating and regeneration. SOLUTION: A casing 1 consists of an integrated lower body 20 of the casing and casing upper bodies 22a-22e of a separated structural body plural chambers 3a-3e. Each of chamber 3a-3e has an installed filter pack 30 contained in a cylinder 32 consisting of a filter and a heater 4 covered with a heat insulating material. The filter captures soot and dust and the heater 4 heats the soot and dust sticking to the filter and thereby regenerates the filter. The gas which is heated by the regeneration process is present in a space formed by the cylinder 32 and the casing upper bodies 22a-22e and does not come into contact with the lower body 20 of the casing. Thus, lower body 20 of the casing does not suffer a stress caused by a thermal expansion difference. In addition, the upper bodies 22a-22e of the casing in a regeneration chamber expands significantly, but no stress generates between the upper bodies of the casing because of their separated structural body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has been devised so that a large stress due to a difference in thermal expansion does not occur in a casing even when the temperature of each chamber is different during regeneration.

[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 that the gas flow rate through the bag be very slow and that many bugs be required.

(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. 12), whereas the centrifugal force 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. 14, 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]

By the way, since the flow passage 03 that is being regenerated is heated by the heater 07, the temperature of the flow passage 03 that is being regenerated is the same as that of the other flow passage 03 that is not being regenerated. There is a large temperature difference between the two. For this reason, the flow path 03 that is being regenerated in the casing 1
The surface that encloses the surface of the casing 1 undergoes large thermal expansion as compared with the surface that encloses the other flow paths 03, and the dimensions of the casing 1 are partially distorted and deformed. Moreover, the portion where the dimensional strain due to such a difference in thermal expansion occurs shifts as the regenerating flow passage shifts. That is, in the period T ₁ , the casing 01 around the flow path 03-1 is greatly thermally expanded, and in the period T ₂ , the flow path 0 is zero.
As the casing 02 around 3-2 undergoes large thermal expansion, large thermally expanding parts are sequentially and periodically displaced, and large stress acts on the boundary between the large thermally expanding part and other parts. When the stress due to the difference in thermal expansion repeatedly acts on the casing 01, the casing 01 may be stress fatigued and its strength may be reduced, but conventionally, no measures have been taken against such a problem.

In view of the above-mentioned prior art, it is an object of the present invention to provide a dust remover in which a large stress due to the difference in thermal expansion is not applied to the casing.

[0016]

The structure of the present invention for achieving the above object has a plurality of chambers for flowing exhaust gas from the lower side to the upper side, and each chamber is provided with a locking portion, and further, Of these, the casing lower body that forms a space below the locking portion is an integral structure, and the casing upper body that forms a space above the locking portion in each chamber is an independent divided structure. A casing that has an upper surface and a lower surface and a flange portion formed on the outer peripheral surface and is covered with a heat insulating material in a cylindrical body that is equipped with a heater that generates heat when energized and a filter that is a porous ceramic body. And a plurality of filter packs held in each chamber at the position where the flange portion is locked to the locking portion.

In the present invention, the high temperature gas generated by heating and regeneration exists in the space inside the tubular body of the filter pack and the space formed by the upper casing body of the casing, and the high temperature gas is a lower casing body which is an integral structure. Never touch. Therefore, there is no difference in thermal expansion between the lower casings and no stress is generated. Further, although the casing upper body of the regeneration chamber undergoes large thermal expansion, no stress is generated between the casing upper bodies due to the divided structure.

[0018]

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 partially cutaway perspective view showing a dust removing apparatus according to an embodiment of the present invention. 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 of the chambers 3a to 3e extends in the vertical direction and has a heater 4 (details described later) and a filter 5 (details described later) 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, the structure is such that the upper side is connected and the gap between the two gradually increases toward the lower 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).
It is a mixture of ₂ O 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 ceramic porous body 5b (length in the direction in which exhaust gas passes)
Is 40 to 60 [mm].

The flow velocity of the exhaust gas (exhaust gas from the diesel engine) flowing in 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 pores 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 the flow path of the continuous pores is complicated. 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 1 to 2
Very slow, around [m / min].

Further, 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. The filter 5 is integrated into the filter pack, but the structure of the filter pack will be described later.

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. The timing for performing the reproducing operation will be described later.

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).

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 fire resistant heat resistant material 4e. And lead wire 4
By supplying power to the heating element 4b via f, the heating element 4b
b heats up. The heater 4 is integrally attached to the filter pack described later.

Here, the structure of the casing 1 and the structure of the filter pack will be described with reference to FIGS. The configuration of the casing 1 and the filter pack is the point of the present invention.

As shown in FIG. 6, the casing 1 is an integral casing lower body 20 at a portion located below the engaging portions 21a to 21e, but the engaging portion 21 is formed.
A portion located above a to 21e is divided into independent casing upper bodies 22a to 22e. Each of the casing upper bodies 22a to 22e corresponds to the casing lower body 20.
It is bolted to. After all, the casing lower body 20 and the casing upper bodies 22a to 22e are combined to form the casing 1, and the plurality of chambers 3 are provided in the casing 1.
a to 3e are formed. The partition plate 2 in FIG. 1 means a wall plate extending vertically in the casing lower body 20 and the casing upper bodies 22a to 22e in FIG.

Thus, the casing 1 has a plurality of chambers 3
a to 3e are formed. Locking portions 21a to 21e are formed on the inner side walls of the chambers 3a to 3e. Then, in the filter pack 30, the flange portion 31 is locked to the locking portions 21a to 21e, so that the chambers 3a to 3e.
It is stored and held in 3e. When stored, the flange portion 31 and the engaging portions 21a to 21a are fixed by bolts.
e is fastened.

When replacing the filter pack 30, first, the casing upper bodies 22a to 22e are removed from the casing lower body 20, and the flange portion 31 and the locking portions 21a to 2e.
Loosen the bolts that fasten 1e to the filter pack 30 that has been used up to now (a filter and a heater are incorporated therein as will be described later) and lift it out by a crane. Next, a new filter pack 30 is hung by a crane and lowered from above the chambers 3a to 3e downward to lock the flange portion 31 to the locking portions 21a to 21e. Then, the flange portion 31 and the locking portions 21a to 21e
And the upper casings 22a to 22e are attached to the lower casing body 20 with bolts. The lifting and hanging operations of the filter pack 30 by such a crane are easy, and the filter pack 30 can be easily replaced. Further, the flange portion 31 and the locking portions 21a to 21e can be easily bolted from the upper surface opening from which the casing upper bodies 22a to 22e are removed.
The seal of 1a to 21e can be surely performed.

The filter pack 30 is a perspective view of FIG.
(However, the heater is omitted), the configuration as shown in FIG. 8 which is an AA cross section of FIG. 7, FIG. 9 which is a BB cross section of FIG. Has become.
That is, the flange portion 31 is provided on the outer peripheral surface of the tubular body 32 having a four-sided tubular shape whose upper and lower surfaces are open.
2 and the flange portion 31 are formed of a heat insulating material. In this cylindrical body 32, three support beams 33, 34, 35 are provided.
Is provided. That is, both ends of the support beam 33 are fixed to the front wall 32a and the rear wall 32b of the tubular body 32, and are occupied at the upper position in the tubular body 32. The support beam 34 has a U-shaped cross section, and both ends thereof are fixed to the front wall 32a and the rear wall 32b.
It is occupying along the side wall 32c at the lower position inside. The support beam 35 has a U-shaped cross section, and both ends thereof are fixed to the front wall 32a and the rear wall 32b.
It is occupying along the side wall 32d at the lower position inside.

On the other hand, on the inner surface of the front wall 32a, guide rails 36a, 36b having a U-shaped cross section are provided in a C-shaped array (see FIG. 7). Further, guide rails 37a and 37b having a U-shaped cross section are provided on the inner surface of the rear wall 32b in a C-shaped array.

The filter member 5-1 of the filter 5 has its both ends supported by the guide rails 36a and 37a, and is inserted obliquely from the upper side to the lower side.
4 supported. Similarly, the filter member 5-2 is
Both ends thereof are supported by guide rails 36b and 37b while being inserted obliquely from above to below, and the lower end thereof is supported by a support beam 35. Furthermore, the filter members 5-1 and
The top of 5-2 is fixed by a support beam 34, a bolt member 38, and a support plate 39 (see FIG. 9), and a sealing material is provided between the top of the filter members 5-1 and 5-2 and the support plate 39. 40 is filled.

Further, as shown in FIGS. 8 and 9, one end of each of the three heaters 4 is supported by the front wall 32a of the tubular body 32, and the other end thereof is supported by the rear wall 32b.

After all, the filter 5 is included in the filter pack 30.
And the heater 4 is integrally assembled.

Next, a method of operating the dust remover of this embodiment will be described with reference to FIG.

In FIG. 11, the starting period T ₁ (for example, 30
Min), that is, the damper 6a for a certain period of time from the time when the exhaust gas from the diesel engine begins to flow into the dust remover.
6e and 9a to 9e are all opened, and all the heaters 4 of the filter pack 30 provided in the chambers 3a to 3e are de-energized. As a result, soot and dust can be collected by the filter 5 of the filter pack 30 provided in each of the chambers 3a to 3e.

The temperature of the exhaust gas is 200 to 500 ° C., although it varies depending on the operating conditions of the diesel engine. Therefore, in the period T ₁ , the heater 4 in each of the chambers 3a to 3e is heated by the high-temperature exhaust gas and the moisture absorption section is also completely dried. That is, the spacer 4d and the refractory heat resistant material 4e (see FIG. 5) of the heater 4 easily absorb moisture, but are completely dried by the exhaust gas in the period T ₁ . Therefore, when the heater 4 is energized thereafter, high dielectric strength can be maintained. After all, in the starting period T ₁ , the drying / collecting operation is performed in which the dust collection and the drying operation are simultaneously performed.

It should be noted that a weak current may be passed through the heater 4 to prevent moisture absorption during a period prior to the period T ₁ , that is, even when exhaust gas is not being passed.

In the period T ₂ (30 minutes to 1 hour), the room 3a
The filter 5 provided for is regenerated. That is, the damper 8a,
11a is closed, the heater 4 of the chamber 3a is energized to heat the filter 5 of the chamber 3a, and the soot dust adhering to it is burned. At this time, a temperature sensor (not shown) is provided above the filter 5 to ideally prevent the temperature above the filter 5 (the space above the chamber 3a) from exceeding a set temperature (for example, 600 ° C.). The value of the current flowing through the heater 4 is feedback-controlled so that it falls within the temperature range of 500 to 550 ° C.

Even if the motors 7a and 10a are driven to bring the dampers 8a and 11a into the fully closed state, there is a slight gap. That is, when the fully opened state is set to 100 [%], the damper is fully opened by several [%] even when the damper is fully closed. Therefore, even if the dampers 8a and 11a are fully closed, the exhaust gas (200 to 500
(° C.) Leaks from the inlet gas duct 6a into the chamber 3a, and the air in the chamber 3a leaks into the outlet gas duct 9a through the gap of the damper 11a. Also, period T
_Although the heater 4 of the chamber 3a may be energized over the entire period of ₂ , the heater 4 may be energized for only a part of the period T ₂ . In short, it suffices to energize the heater 4 only for the time when the soot dust adhering to the filter 5 completely burns.

In addition, in the above embodiment, each room is provided with the entrance side damper and the exit side damper, but each room is provided with only one of the entrance side damper and the exit side damper, and one of the dampers is provided at the time of regeneration. It may be closed and heated / regenerated.

The collection of soot and dust in the period T ₂ is performed in the chamber 3b,
This is performed by the filter 5 of 3c, 3d and 3e. At this time, the heaters 4 in the chambers 3b, 3c, 3d and 3e are in a non-energized state. Eventually, in the period T ₂ , the regeneration / collection operation for regeneration and collection is performed.

In the period T ₃ (1 to 3 minutes), the soot blow operation is performed in order to blow away a small amount of ash (a component left after burning the dust) remaining in the filter 5 of the chamber 3a where the regeneration is completed. That is, all the heaters 4 in the chambers 3a to 3e are turned off, the dampers 8a and 11a are opened, and the dampers 8b and
8c, 8d, 8e, 11b, 11c, 11d and 11e are closed. In this way, the exhaust gas flows only in the chamber 3a, the flow speed of the exhaust gas in the chamber 3a increases, and the ash attached to the filter 5 in the chamber 3a is blown off. This is called soot blow operation. By blowing off the ash in this manner, it is possible to effectively collect the soot and dust that is performed thereafter. The collection of soot dust during this period T ₃ is performed by the filter 5 in the chamber 3a.

In the period T ₄ , the filter 5 in the chamber 3b is regenerated, and the soot dust is collected by the filters 5 in the chambers 3a, 3c, 3d and 3e. In period T ₅ , filter 5 in chamber 3b
The soot blow operation that blows away the ash remaining in the
The soot and dust is collected by the filter 5 of b.

Thereafter, the chambers are sequentially shifted, and regeneration → soot blowing is periodically performed.

In the operating state shown in FIG. 11, the soot blow operation is always performed immediately after the regeneration operation. However, the soot blow operation is performed after the regeneration operation is performed a predetermined number of times (this number is arbitrarily set by the operator). You may do it.

When heating / regeneration is performed during the above-described operation, for example, in the period T ₂ , the tubular body 32 and the flange portion 31 of the filter pack 30 are covered with a heat insulating material (see FIG. 6), and the heater 4 is used. Heated by high temperature (500
The gas having a temperature of up to 600 ° C. exists in the space surrounded by the cylindrical body 32 of the chamber 3a and the space surrounded by the casing upper body 22a, so that the high temperature (500 to 600 ° C.) gas is generated in the lower portion of the casing. It does not touch the body 20.

Therefore, even though the chamber 3a is heated and regenerated, the casing lower body 20 forming the lower portion of the chamber 3a is shielded by the tubular body 32 covered with the heat insulating material, and the high temperature gas is discharged. (500 ~ 600 ℃) does not touch directly, low temperature (200 ~ 50
Only the gas at 0 ° C. makes contact. After all, in the casing lower body 20, a chamber (for example, the chamber 3) in which regeneration and heating are performed.
Even in the case of a), another chamber (for example, the chamber 3b) that is collecting
3e), the high temperature gas (500 to 600 ° C.) does not come into contact with it, but only the low temperature ((200 to 500 ° C.) gas comes into contact therewith. It is the same in the room where you are doing and the other rooms,
The casing lower body 20 has no difference in thermal expansion, and stress due to the difference in thermal expansion does not occur.

On the other hand, while the chamber 3a is being heated and regenerated, the casing upper body 22a is exposed to high-temperature gas and undergoes large thermal expansion, but the casing upper body 22a is independent of the other casing upper bodies 20b to 22e. -Since it is divided, stress due to the difference in thermal expansion does not occur between the upper casings.

Even if the chamber 3a is heated and regenerated in this way,
In the casing 1 (casing lower body 20 and casing upper bodies 22a to 22e), stress due to the difference in thermal expansion does not occur, and the strength of the casing 1 can be maintained.

During the periods T ₄ , T ₆ and T ₈ , the other chambers 3b to 3b.
3e also heats and regenerates, but at this time as well, the stress due to the difference in thermal expansion does not occur and the strength of the casing 1 can be maintained.

The dust remover of the above-described embodiment can be used not only to collect and remove not only the exhaust gas emitted from the diesel engine but also the soot dust in the exhaust gas emitted from the boiler device, the refuse incinerator, and the like. Of course.

[0054]

According to the present invention as described in detail with reference to the embodiments, the filter pack is provided with the casing lower body and the divided casing upper body, each of which is provided in each chamber of the casing. Since the cylindrical body is covered with the heat insulating material, the high temperature gas heated by the heater of the filter pack at the time of regeneration exists only in the space formed by the cylindrical body and the casing upper body. Therefore, stress due to the difference in thermal expansion does not occur in the lower casing body. Further, the casing upper body of the regeneration chamber undergoes large thermal expansion, but since it is divided from the other casing upper bodies, stress due to the difference in thermal expansion does not occur between the casing upper bodies. After all,
Large stress due to the difference in thermal expansion does not occur in the casing, strength can be maintained, and durability and safety are enhanced.

[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 sectional view showing a heater.

FIG. 6 is a cross-sectional view showing a casing and a filter pack of the dust removing device according to the embodiment.

FIG. 7 is a perspective view showing a part of the filter pack used in the embodiment excluding the heater.

8 is a cross-sectional view showing a cross section taken along the line AA of FIG.

9 is a cross-sectional view showing a BB cross section of FIG. 8;

FIG. 10 is a perspective view showing a support beam of the filter pack of the embodiment in an extracted manner.

FIG. 11 is a time sequence chart showing the operation method of the embodiment.

FIG. 12 is a characteristic diagram showing a dust size and its ratio in diesel exhaust gas.

FIG. 13 is a perspective view showing a conventional dust remover with a part thereof broken away.

FIG. 14 is a time sequence diagram showing a method of operating a conventional dust removing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Partition plate 3a-3e Chamber 4 Heater 5 Filter 5-1 and 5-2 Filter member 5a Frame material 5b Ceramic porous body 6a-6e Inlet gas duct 7a-7e Motor 8a-8e Inlet side damper 9a-9e Outlet gas duct 10a -10e Motor 11a-11e Output side damper 20 Casing lower body 21a-21e Engagement part 22a-22e Casing upper body 30 Filter pack 31 Flange part 32 Cylindrical body 33,34,35 Support beam 36a, 36b, 37a, 37b Guide Rail 38 Bolt member 39 Support plate 40 Sealing material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadatoshi Ishigaki 12 Nishiki-cho, Naka-ku, Yokohama-shi, Kanagawa Mitsubishi Heavy Industries, Ltd. Yokohama Works

Claims (1)

[Claims] 1. A casing lower part having a plurality of chambers for allowing exhaust gas to flow upward from below and having a locking portion in each chamber, and further forming a space lower than the locking portion in each chamber. The body is an integral structure, and the casing upper part that forms the space above the locking part in each chamber is a casing that is an independent divided structure, and the upper and lower surfaces are open and the outer peripheral surface is A cylindrical body having a flange portion formed and covered with a heat insulating material was provided with a heater made of a ceramic porous body and a heater which generates heat when energized, and the flange portion was locked to the locking portion. A dust remover comprising: a plurality of filter packs held in each room at a position;