JP3499943B2 - Dust removal device - Google Patents

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 more particularly to a dust remover for high temperature dust-containing gas discharged from a combustion facility / gasification facility using fossil fuel such as coal. However, the present invention is not limited to this, but can be applied to exhaust gas dust removers such as those for iron making, cement, and chemical plants.

[0002]

2. Description of the Related Art FIGS. 8 and 9 are sectional views showing an example of a conventional dust remover. In this conventional dust remover, a plurality of porous filter cylinders 1 are arranged along the flow direction of dust-containing gas. That is, the respective porous filter cylinders 1 are arranged along the flow direction of the dust-containing gas in the can body 33 arranged substantially vertically. The dust-containing gas flowing into the can body 33 from the dust-containing gas inlet 30 at the top of the can body 33 flows into each porous filter cylinder 1 and passes through the filter wall from the inside to the outside. The dust is removed, and the gas becomes clean gas and flows out from the clean gas outlet 31. On the other hand, the dust removed from the gas is guided to the dust hopper 34 below the can body 33 and discharged. It should be noted that the upper and lower ends of each porous filter cylinder 1 have tube plates (partition plates) 5, 21,
It is supported by 37. FIG. 8 (A) shows one filter cylinder, that is, a plurality of unit filter cylinders 1 arranged substantially vertically in the can body 33, and the filter cylinder upper end and the filter cylinder lower end are the upper tube sheet 5 and the lower tube sheet. 1 shows an example of a dust removing device supported by a dust seal 36 by 21. The unit filter cylinder 1 is sealed by a dust seal 36 using a ceramic fiber lobe or the like, and allows relative displacement due to the difference in thermal expansion between the filter cylinder 1 and the tubular body 33 in both the radial direction and the axial direction, but the filter cylinder is reversed. When the method of regenerating by washing is used, the upper tube sheet 5 is deformed in the lower tube sheet 21 due to the differential pressure during backwashing, and the bending moment exerts a stress on the filter tube. It becomes difficult to make the length longer.

FIG. 8B shows another example of a conventional dividing device. The support tube plate 37 is attached to the divided portion (connecting portion) 39 of the filter cylinder 1.
Is provided and supported, and a dust seal 36 is provided at a required position. Also in this conventional example, the stress due to the bending moment acts, and it is difficult to increase the length on a practical scale.

In FIG. 9, unit filter cylinders are connected from a porous solid to form one filter cylinder, and at least the connection part of the filter cylinder group is sealed dust-tight, and the connection part is supported by a tube plate. 1 shows an example of a dust collector. 9B is an enlarged cross-sectional view of the filter tube connecting portion R portion in FIG. 9, FIG. 9C is an enlarged cross-sectional view of the connection portion between the water cooling tube plate 40 at the lower end and the filter tube 1 in FIG. 9, and FIG. Top water cooling tube plate 40
The expanded sectional view of the connection part of the filter barrel 1 and FIG. In FIG. 9, 1
The structure is shown in which the ends of the ceramic tubes 1, 1 constituting the upper and lower two filter tubes are inserted and connected to the insertion holes of the water cooling tube plate 40. In this connection structure, the upper ceramic tube is placed on the lower ceramic tube, and a string-shaped seal made of a fiber lobe or the like is wound around and filled in the tube between each ceramic tube and the insertion hole for sealing. However, in the above-mentioned connection structure, since the upper ceramic tube is supported by the lower ceramic tube, when it becomes a multi-stage structure,
The lower ceramic tube is subject to excessive load and is easily damaged. Further, since the upper and lower end faces of the ceramic tube are in contact with each other, this end face is also easily damaged. When it becomes a multi-stage structure,
Elongation due to the difference in thermal expansion is accumulated, the amount of expansion increases as it goes up, and the seam position may not fit within the thickness of the tube sheet. Further, at the time of backwashing in the dust collector using the connection structure, for example, a pulsed backwash airflow is made to flow in the space below the tube plate and outside the ceramic tube,
On the other hand, in the space above the tube plate and outside the ceramic tube, dust-removed gas at normal pressure may flow.
At this time, the total amount of the backwash airflow should flow through the ceramic tube wall into the tube, but since the sealability of the seal part is insufficient, the backwash airflow passes through the seal part and is usually above. It often flows into the space of pressure and backwashing is not performed sufficiently.

[0005]

When the above conventional dust remover is used to remove high-temperature dust-containing gas discharged from a combustion facility that uses fossil fuel such as coal, which produces a large amount of dust, it has a large capacity. In order to remove dust-containing gas, it was necessary to arrange a plurality of porous filter cylinders so as to be vertically long in the flow direction of dust-containing gas so as to secure an area through which the gas passes.
This porous filter cylinder generally has a very low strength before firing, and a long product is easily deformed in the process of handling and firing, so that one length can be manufactured at most about 1 to 2 m. . There is also a technique for joining these short porous ceramic tubes to each other, but there is a problem that the longer they are, the more they are destroyed by self-excitation and vibration from others. That is, in the conventional dust removing device, the connecting portion of the filter cylinder is dust tightly sealed and supported by the tube plate to increase the length, thereby absorbing the difference in thermal expansion between the can body and the filter cylinder, earthquake, self-excitation and other factors. However, in order to reduce the bending moment that acts on the filter tube due to the deformation of the upper tube plate and the lower tube plate due to the differential pressure during backwashing, and the thermal deformation at high temperature, Since the upper and lower ends of the filter cylinder are connected within the range of the insertion hole of the tube plate and the sealing material is filled between the filter cylinder and the insertion hole to seal and support,
There are various technical problems such as a structure that cannot be established when the connecting portion is disengaged from the insertion hole due to a difference in thermal expansion or the like. The present invention solves the above problems and provides an elongated dust removing device which does not suffer damage or lower dust removing capability even when a large load is applied or a thermal expansion difference is accumulated.

[0006]

For this reason, the present invention provides a dust removing apparatus in which a dust-containing gas is supplied to the inside of a filter cylinder made of porous ceramic having air permeability and clean gas is taken out from the outside of the filter cylinder. The filter tubes are joined together to form a long filter tube, and there is a connecting part with a loose concavo-convex structure that can be bent in one place in the middle of the filter tube. It is rotatably supported by an annular body that is slidable up and down relative to the tube plate, and the middle part of the filter barrel at either end of the upper filter barrel or the lower filter barrel is slidably supported up and down. While making the tube stand upright, the upper filter tube or the lower tube
Which supports the middle part of the filter cylinder at one end of the filter cylinder
Is fixed to the tube plate attached to the container, and the filter tube is attached to the tube plate.
A space for equalizing the upper and lower chambers is provided around the place where the
The deformation of the tube sheet due to the pressure difference between the upper and lower chambers is suppressed,
It eliminates the swing at the support point of, and makes this a means for solving the problem. According to the present invention, the lower tube sheet and the lower end of the filter tube have a loose concavo-convex structure, which is sealed by dust tight through a packing so as to be rotatably displaceable, and slidably sealed vertically with respect to the upper tube sheet. The ring-shaped body and the upper end of the filter cylinder have a loose concavo-convex structure, which is sealed by dust tight through a packing to support rotatably displacement. With a connecting structure via a packing with a loose uneven structure that is possible,
Lower tube plate, in which respect the deformation of the upper tube sheet composed is configured to be rotationally displaced individually sealed, it is an unit for the these problems solved.

[0007]

[Function] Only one of the upper filter cylinder and the lower filter cylinder is supported, and the packing is attached to the loose concavo-convex structure part of the upper and lower filter cylinders at the position out of the insertion hole of the tube plate, and it is possible to bend while maintaining the sealing property. The filter tube connecting / supporting structure of the present invention in which a space is provided around the tube plate insertion portion of the filter tube allows the loose concavo-convex structure portion to have a cushioning property even when a large load is applied to the lower filter tube. Since a certain packing is attached and connected, there is no risk of breakage, and even if the thermal expansion difference is accumulated, it is sealed and supported regardless of the insertion hole of the tube sheet, so there is no problem of seal deterioration and support. Since it does not occur, a gap is provided between the filter cylinder and the insertion hole of the tube plate, and back-and-forth vertical back washing is not performed, so there is no concern about back wash performance deterioration, and the connecting portion has a structure that can be bent while maintaining sealing performance. Therefore, even if the upper and lower tube sheets are deformed during backwashing, the filter tube It is not the stress caused by the bending moment acts, the utility-scale long at weak ceramic filter strength can be achieved.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 to 7, the same parts are designated by the same reference numerals, and overlapping description will be omitted. FIG. 1 shows a filter barrel connecting / supporting structure according to a first embodiment of the present invention. 3 is a cross-sectional view of the connecting portion structure, FIG. 5 is a cross-sectional view of the filter tube mounting portion in the upper tube sheet portion, and FIG. 6 is a cross-sectional view of the filter tube mounting portion in the lower tube sheet portion. In the first embodiment, the can body 3 of the dust removing device shown in FIG.
A plurality of air-permeable porous filter cylinders 1 are arranged substantially vertically in the chamber 3, and dust-containing gas is supplied to the inside thereof to take out clean gas from the outside of the porous filter cylinder. Figure 1
As shown in FIG. 2, the unit filter cylinders arranged substantially vertically are heated and pressure-bonded at each filter cylinder joint portion 17 to form one filter cylinder, and the upper filter cylinder 2 and the lower filter cylinder 3 are connected to each other by the filter cylinder connecting portion 4. Connected to each other to form a vertically long filter cylinder, and the upper tube sheet 5 and the lower tube sheet 21 are connected to each other.
Installed between and supported by.

In FIG. 5, the upper tube sheet 5 has an insertion hole 16 for a filter cylinder, and a metal ring 9 having an annular shape and a flange on the upper outer peripheral portion is inserted into the insertion hole 16 to insert the upper tube sheet 5 into the upper tube sheet 5. Fixed to. Further, in the insertion hole 16, a loose concavo-convex structure is formed between the upper end of the upper filter cylinder 2 and the lower end mounting seat 8 of the annular body 7 via a seal packing (b) 10 in which ceramic fibers or the like are woven, It is possible to seal the rotational displacement by the weight of the annular body 7. The ring-shaped body 7 is slidable up and down through a rope-shaped seal packing (a) 6 in which ceramic fibers or the like are woven between the outer peripheral portion of the ring-shaped body 7 and the ring-shaped metal ring 9. , And the metal ring 9 with dust sealed
It is supported by the upper tube sheet 5 via. Further, a pressing plate 11 is placed on the seal packing (a) 6 between the outer peripheral portion of the annular body 7 and the inner peripheral portion of the metal ring.
6 is prevented from falling off.

In FIG. 6, the lower tube sheet 21 has an annular filter barrel receiving member 20, and has a loose concavo-convex structure between the upper end mounting seat 8 of the filter barrel receiving member 20 and the lower end of the lower filter barrel 3. The ring body 7, the upper filter cylinder 2, and the seal packing (b) 10
The lower filter cylinder 3 is supported by its own weight so that it can be rotationally displaced and sealed. FIG. 3 shows a filter barrel connecting / supporting structure of the upper filter barrel 2 and the lower filter barrel 3, and the connecting portion is a mounting seat 8 at the upper end of the lower filter barrel 3.
Is formed, and the lower end of the upper filter cylinder 2 is placed on the upper part thereof through the seal packing (b) 10 to form a loose concavo-convex structure capable of being individually refracted. The circular ring body 7 and the upper filter cylinder 2 are rotationally displaced by their own weight. It is possible to seal. Further, in order to enable the rotational displacement individually by the upper and lower filter cylinders, the intermediate portion of the filter cylinder of the upper filter cylinder is slidably supported in the vertical direction by the support metal (a) 13 fixed to the tube plate 12, Make the filter tube stand upright. Further, the insertion hole 16 provided in the tube sheet 12 has a space 18 between the lower filter cylinders 3.
Is formed to promote equalization communication in the upper and lower spaces of the tube sheet 12 during backwashing, and prevent displacement of the tubesheet 12 due to the differential pressure during backwashing.

FIG. 2 shows a filter barrel connecting / supporting structure according to a second embodiment of the present invention. FIG. 4 shows a sectional view of the connecting portion structure.
In the second embodiment, as shown in FIG. 4, the filter barrel connection of the upper filter barrel 2 and the lower filter barrel 3. The connecting portion of the support structure has the same structure as that of FIG. 3, and is configured to be sealed by rotational displacement by the weight of the annular body 7 and the upper filter cylinder 2. Further, in order to enable the rotational displacement individually by the upper and lower filter barrels, the intermediate portion of the filter barrel of the lower filter barrel 3 is supported slidably up and down by the support metal member (b) 14 fixed to the tube plate 12. Make the upper and lower filter tubes stand upright.

[0012]

As described in detail above, according to the present invention, due to the connecting / supporting structure of the upper filter cylinder and the lower filter cylinder, even if a large load is applied to the lower filter cylinder, the cushioning property of the loose concavo-convex structure is obtained. Since there is a packing that has a connection,
There is no risk of breakage, and even if the difference in thermal expansion is accumulated, the seal and support are independent of the insertion hole of the tube sheet, so there is no problem of deterioration of the seal or support, and the insertion of the filter tube and tube sheet. Since there is a space between the holes, and there is no need to worry about backwashing performance deterioration because it is backwashed in the vertical direction at the same time, and because the connection part has a structure that can be bent while maintaining sealing performance, the upper tube sheet and lower part Even if the tube plate is deformed, the stress due to the bending moment does not act on the filter cylinder, and the ceramic filter having low strength can be made long on a practical scale.

[Brief description of drawings]

FIG. 1 is a structural view of a filter barrel connection / support structure according to a first embodiment of the present invention.

FIG. 2 is a filter barrel connection / support structure diagram according to a second embodiment of the present invention.

FIG. 3 is a sectional view of a connecting portion structure of the first embodiment.

FIG. 4 is a sectional view of a connecting portion structure according to a second embodiment.

FIG. 5 is a sectional view of an attachment portion of a filter cylinder in the upper tube sheet portion of the embodiment.

FIG. 6 is a sectional view of an attachment portion of a filter tube in the lower tube sheet portion of the embodiment.

FIG. 7 is an explanatory view showing the entire dust removing device of the same embodiment.

FIG. 8 is a sectional view showing an example of a conventional dust remover.

FIG. 9 is a cross-sectional view showing another example of a conventional dust removing device.

[Explanation of symbols]

1 filter tube 2 Upper filter cylinder 3 Lower filter tube 4 Filter tube connection part 5 Upper tube sheet 6 Seal packing (a) 7 torus 8 mounting seat 9 metal rings 10 Seal packing (b) 11 Presser plate 12 tube sheet 13 Support hardware (a) 14 steady rest 15 Support ring 16 insertion holes 17 Filter tube joint 18 intervals (clearance) 19 Support hardware (b) 20 Filter barrel hardware 21 Lower tube sheet 30 Dust-containing gas inlet 31 Clean gas outlet 32 Ash extraction section 33 cans 34 hopper 35 inner cylinder

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Akiyama               1-1 Nagasaki City Atunoura-cho Mitsubishi Heavy Industries Ltd.               Inside the Nagasaki Shipyard (72) Inventor Hisataka Urakata               1-1 Nagasaki City Atunoura-cho Mitsubishi Heavy Industries Ltd.               Inside the Nagasaki Shipyard                (56) References JP-A-6-285320 (JP, A)                 Actual Kaihei 4-57218 (JP, U)

Claims (3)

(57) [Claims] 1. A dust removing device, wherein a dust-containing gas is supplied to the inside of a filter cylinder made of porous ceramics having air permeability, and clean gas is taken out from the outside of the filter cylinder. Without a cylinder, it has a loose concavo-convex connecting part that can be bent at one place in the middle of the filter cylinder, and these filter cylinders can be rotationally displaced on the lower tube sheet and can slide up and down with respect to the upper tube sheet. rotating displaceably supported in an annular body provided, causes self-standing the濾筒the upright濾筒intermediate portion of one end of the upper濾筒or lower濾筒slidably supporting and vertically, the upper Either the filter tube or the lower filter tube at one end
The metal supporting the middle part of the filter cylinder is attached to the tube plate attached to the container.
The upper and lower chambers are fixed around the place where the filter tube is inserted into the tube plate.
There is an interval for equalizing and communicating with each other.
Prevents deformation of the tube sheet and eliminates runout at the support point of the filter tube
A dust removing device characterized in that 2. The lower tube sheet and the lower end of the filter tube according to claim 1, wherein the lower tube sheet and the lower end of the filter tube have a loose concavo-convex structure. A dust remover characterized in that a sealable annular body and the upper end of a filter cylinder have a loose concavo-convex structure, and are sealed to dust tight through a packing so that they can be rotationally displaced. 3. The connecting part between the lower filter cylinder and the upper filter cylinder according to claim 1, wherein the connecting structure is via a packing having a concave and convex structure which can be bent, and is rotated independently with respect to deformation of the lower tube plate and the upper tube plate. A dust remover characterized by being capable of displacement sealing.