JP2540020Y2 - Filter cloth cage for bag filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention constitutes a bag filter for removing substances such as dust and toxic substances in exhaust gas in an incinerator exhaust gas treatment apparatus for treating exhaust gas discharged from a municipal waste incinerator. It relates to a filter cloth cage for a bag filter.

[0002]

2. Description of the Related Art Conventionally, municipal solid waste treatment has been dominated by incineration treatment today. Exhaust gas discharged by incineration contains a large amount of harmful substances such as dust, hydrogen chloride (HCl), sulfur oxides (SO _x ), and nitrogen oxides (NO _x ). In order to prevent the occurrence of secondary pollution caused by air pollution, it is necessary to develop exhaust gas treatment equipment that can remove these substances efficiently and effectively. Concentrations are strictly regulated. 2. Description of the Related Art Conventionally, as an exhaust gas treatment device of a municipal solid waste incineration plant, an electric dust collector has been mostly used in most cases. However, the electric precipitator has only a dust collecting function, and can remove dust mixed in exhaust gas, but cannot remove harmful substances such as hydrogen chloride or sulfur oxide.

[0003] Therefore, in order to provide many functions in one processing apparatus, to reduce the size of the apparatus and to efficiently perform exhaust gas processing, an exhaust gas processing apparatus having both a dust collecting function and a harmful substance removing function. A bag filter type dust collector was developed. The bag filter type dust collector is, for example, as shown in FIGS. 4 and 5 and has a higher dust collecting function than an electric dust collector, and has a cylindrical filter cloth 30 and a steel pipe incorporated in the cylinder. It has a cage 31 made of. FIG. 4 is a schematic explanatory view showing an example of a bag filter type dust collector, and FIG. 5 is a schematic perspective view showing an example of a bag filter type dust collector.

In the bag filter type dust collector 20 shown in FIG. 4 or FIG. 5, exhaust gas discharged from the incinerator sprays NH ₃ gas into the exhaust gas and is introduced into the bag filter from the gas inlet 21. The exhaust gas introduced from the gas inlet 21 is guided by the baffle plate 22 and guided toward the filter cloth 30, and the clean gas purified by the filter cloth 30 is filtered by the filter cloth 3.
It is configured to be guided to a gas outlet 23 formed above a partition plate 29 provided at the upper end of the zero. The filter cloth 30
The filter cloth 30 is formed in a vertical cylindrical shape, and a steel cage 31 is incorporated therein. The cage 31 holds the filter cloth 30 in a cylindrical shape. The cage 31 serves to prevent deformation of the cylinder caused by exhaust gas flowing from the outside to the inside of the cylinder.

The exhaust gas passes through the cylinder of the filter cloth 30 from the outside to the inside at a speed of about 0.4 to 1.2 m / min. When the exhaust gas passes through the filter cloth 30, dust adheres to and is removed from the filter cloth 30, and only the clean gas that has been cleaned is filtered.
, And is discharged outside through a gas outlet 23 provided above the bag filter. In the upper part of the gas inlet 21,
An air tank 24 is provided, and a blow pipe 26 is communicated from the air tank 24 to the upper part of the filter cloth 30 via a pulse valve 25. Regarding the pulse valve 25, the operation time of the air pulse is 3/100 seconds, and the air pulsation generated by the pulse valve 25 causes the filter cloth 30 to vibrate from the inside of the filter cloth 30 and dust adhering to the surface of the filter cloth 30. It has a function to pay off. The method of removing dust from the surface of the filter cloth 30 is generally called an air pulse method or a jet pulse method. Dust periodically blown off by high-pressure air such as a jet pulse method accumulates in a hopper 27 provided below the bag filter. The dust accumulated in the hopper 27 is carried out through a dust carrying-out device 32 (see FIG. 4), and is collected together with the incineration ash generated at the time of incineration.

At the upper part of the bag filter, an inspection door 28 is provided separately for each filter cloth 30. The inspection door 28 is provided in consideration of workability in case of emergency such as damage to the filter cloth 30. If damage to the filter cloth 30 is found, the damaged filter cloth cylinder is stopped with a plug. As a result, it is possible to replace only that part without stopping the operation of the bag filter body.

FIG. 6 shows a known filter cloth of a bag filter type dust collector. FIG. 6 is a schematic explanatory view showing a state before the cage is inserted into the filter cloth. In order to prevent the filter cloth 30 of the bag filter type dust collector from being crushed by pressure during operation and impairing the dust collecting effect, a cage 31 having substantially the same length as the filter cloth 30 is inserted inside the filter cloth 30. Have been. The filter cloth of the bag filter has upper and lower rings 38 to maintain the shape, and the filter cloth 30 is arranged between the rings 38. The diameter of the filter cloth 30 is generally, for example, in the range of φ100 to 300 mm, and the dust collection area of the filter cloth 30 is adjusted mainly by the length. The cage 31 to be interpolated is
Upper and lower ring 36, middle ring 34 and ring 3
It is formed integrally from a cage vertical bar 37 extending in the longitudinal direction and fixed to the second and second tubes 36, and has a diameter that can be inserted into the filter cloth 30. The insertion of the cage 31 into the filter cloth 30 is performed after the filter cloth 30 is attached to the bag filter type dust collector.
1 so as not to damage the filter cloth 30 from directly above the filter cloth 30.
The cage 31 is inserted along the hollow of.

Further, Japanese Utility Model Publication No. 3-40333 discloses that
A bag filter device is disclosed. The bag filter device has a plurality of tubular filter cloths arranged in a casing having an inlet for a dust-containing gas to be treated and an outlet for a treated gas, and a bench lily is provided at both upper and lower ends of the cylindrical filter cloth. In the enclosed state, a backwash gas ejection pipe is inserted by inserting a predetermined distance into the filter cloth, and the cage disposed in the cylindrical filter cloth is constituted by a plurality of cage units divided in its length direction. , A connecting device is provided between the upper and lower cage units.
In the connecting device, a U-shaped frame body having an open bottom is provided on a peripheral surface of a lower end portion of an upper cage unit, and a horizontal state of the rotation lever and a state where the rotation lever is inclined upward at one of the lower ends of the frame body. And a ring is provided on the outer periphery of the upper end of the lower cage unit, and this ring is pressed into the rotation lever and the rotation lever is rotated upward to put the ring in the frame. The length of the rotation lever is set so that the rotation lever can be returned to a horizontal state with the ring positioned above the frame.

[0009]

In the bag filter type dust collector 20 as described above, as shown in FIG.
Is inserted from directly above the filter cloth 30 along the hollow of the filter cloth 30, so that a work space equal to or longer than the length of the cage 31 is required above the bag filter, that is, the filter cloth 30. In recent years, the length of the cage 31 has been increased with the increase in large-capacity exhaust gas treatment. In addition, as shown in FIG. 4, the bag filter type dust collector 20 is often installed on the floor 34 indoors, and the insertion or replacement of the cage 31 is performed by a worker on a main body provided with a handrail 35 or the like. Rises and the cage 3 is placed in the filter cloth 30.
1 is inserted or replaced, but if the cage 31 is long, the cage 31 is held by the roof 33 or the like and the cage 31 is
A state occurs in which it cannot be inserted into 0.

In the bag filter device disclosed in Japanese Utility Model Publication No. 3-40333, a plurality of connecting rods constituting a cage are connected to a ring, and the rings are further connected to each other by hooks. The structure itself has a large number of parts and the structure is complicated, and when inserting the cage into the filter cloth, there is a risk that the filter cloth may be damaged by hooks etc. at the connecting part of the cage. At the same time, it had to be left open, which was unsatisfactory, as work difficulties were expected.

Therefore, an object of the present invention is to solve the above-mentioned problem, and in a filter cloth cage for a bag filter to be inserted into a hollow portion of the filter cloth, insertion and replacement of the cage with respect to the filter cloth are facilitated. An object of the present invention is to provide a filter cloth cage for a bag filter configured to reduce the working space for inserting the cage into the filter cloth and to prevent the filter cloth from being damaged by the cage.

[0012]

SUMMARY OF THE INVENTION The present invention is configured as follows to achieve the above object. That is, the present invention comprises a plurality of divided cages which are divided in a longitudinal direction and hold a cylindrical filter cloth from the inside, wherein each of the divided cages is a ring and a plurality of cage vertical rods mounted on the circumference of the ring. One of the divided cages adjacent to each other has an inward locking portion in which an end of the cage vertical bar is bent toward the cage center, and is adjacent to each other. The other of the divided cages has a circumferential locking portion formed by bending an end of the vertical cage rod in a circumferential direction and biasing a bent end thereof to the inside of the cage. The present invention relates to a filter cloth cage for a bag filter, characterized in that the inward locking portion and the circumferential locking portion are configured to be locked in a crossing state and to be connected to each other.

[0013]

[Function] The filter cloth cage for the bag filter according to the present invention is:
The configuration described above operates as follows. That is, the filter cloth cage for a bag filter is composed of a plurality of divided cages that are divided in a longitudinal direction that holds a cylindrical filter cloth from the inside, and each of the divided cages is attached on a ring and the circumference of the ring. A filter cloth cage for a bag filter, comprising: a plurality of cage vertical rods, wherein one of the divided cages adjacent to each other has an inward engagement in which an end of the cage vertical rod is bent toward a cage center. The other of the divided cages having a stop portion, the other of the divided cages, a circumferential locking portion formed by bending the end of the cage vertical bar in the circumferential direction and biasing the bent tip toward the inside of the cage. Since the divided cages adjacent to each other are configured so that the inward locking portion and the circumferential locking portion are locked in a crossing state with each other and are connectable, the divided cages are formed on each cage vertical bar. Locking part is radially outward When the filter cloth cage for a bag filter in a state in which the adjacent divided cages are connected to each other is not inserted into the filter cloth, the filter cloth is not damaged by the locking portions, and the filter cloth is not damaged. Can be easily attached to and detached from the cage. Moreover, since the structure is such that the vertical cage rods are directly connected, no separate connecting member is required, and the number of parts can be reduced.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment of a filter cloth cage for a bag filter according to the present invention will be described below. FIG. 1 is a schematic perspective view showing an embodiment of a filter cloth cage for a bag filter according to the present invention before a divided cage is connected, and FIG. 2 shows a state in which a cage composed of a vertical cage rod is inserted into the filter cloth. FIG. 3 and FIG. 3 are explanatory diagrams illustrating a process of connecting the cage vertical bars.

As shown in FIG. 1, a filter cloth cage 10 for a bag filter according to the present invention has an upper cage 11 as a divided cage which is divided into a plurality (two in FIG. 1) in the longitudinal direction.
And a lower cage 12. Upper cage 1
1 is configured by arranging an upper end ring 4 and an intermediate ring 3 so as to be spaced apart in the longitudinal direction, and fixing a plurality of cage vertical bars 1 to the upper end ring 4 and the intermediate ring 3. In addition, the lower cage 12 is configured by disposing the lower end ring 13 and the intermediate ring 3 at a distance in the longitudinal direction, and fixing the plurality of cage vertical bars 2 to the lower end ring 13 and the intermediate ring 3. The lower end of the vertical cage rod 1 in the upper cage 11 is bent toward the center of the cage to form an inward locking portion 5. Further, the upper end of the cage vertical bar 2 in the lower cage 12 is bent in the circumferential direction of the lower cage 12 so as to be able to be locked to the inward locking portion 5, so that a circumferential locking portion 6 is formed. The bending tip of the upper end of the cage vertical bar 2 is slightly bent inward in the radial direction as indicated by reference numeral 14 so that the circumferential locking portion 6 can be locked to the inward locking portion 5. The circumferential locking portion 6 is formed so as not to protrude outward in the radial direction.

As shown in FIG. 3, the upper cage 11 and the lower cage 12 lock the inward locking portion 5 of the upper cage 11 and the circumferential locking portion 6 of the lower cage 12 so as to cross each other. Thus, the cage 10 is configured. Preferably, the inward locking portion 5 and the circumferential locking portion 6 are locked to be orthogonal to each other. The cage 10 formed by connecting the upper cage 11 and the lower cage 12 is shown in FIG.
As shown in FIG. 2, the bag filter is inserted from the end ring 8 into the filter cloth 7 to form the bag filter.
The circumferential locking portion 6 is located radially inward and does not protrude outward. Therefore, the cage 10 connecting the upper cage 11 and the lower cage 12 is connected to the filter cloth 7.
The cage 10 does not damage the filter cloth 7 when it is inserted therein.

Regarding the filter cloth cage for a bag filter,
Regarding the work of inserting the cage 10 into the filter cloth 7, first, a plurality of filter cloths 7 are set at predetermined positions in the main body of the bag filter. Then, the lower cage 12 is lowered into the filter cloth 7 through the ring 8 at the upper end and inserted into the filter cloth 7. The lowering of the lower cage 12 is stopped in the state in which the lower cage 12 is in the position. Therefore, the lower end of the upper cage 11 is positioned above the lower cage 12, and the inward locking portion 5 of the upper cage 11 and the circumferential locking portion 6 of the lower cage 12 are locked in a state orthogonal to each other. Then, the inward locking portion 5 and the circumferential locking portion 6 are bent by a cage vertical bar bending tool to be completely connected. After the upper cage 11 and the lower cage 12 are connected to each other to form the cage 10 having an integral structure, the cage 10 is further lowered and completely inserted into the filter cloth 7.

In the above embodiment, the cage 10 is constructed in two stages of the upper cage 11 and the lower cage 12, but is constructed in three or more stages according to the length of the filter cloth 7 or the length of the divided cage. You can also. Further, in the bag filter type dust collector, in order to improve the dust collection property, when the cage vertical rod is energized to form an electrostatic bag filter, that is, a filter cloth surface electrolytic type bag filter, the cage vertical rods 1 and 2 are electrically conductive. If it is made of a material, the inward locking portion 5 of the upper cage 11 and the circumferential locking portion 6 of the lower cage 12 are directly connected to each other. What you get.

[0019]

The filter cloth cage for a bag filter according to the present invention has the following effects because it is configured as described above. That is, in this bag filter cloth cage, one of the divided cages adjacent to each other has an inward locking portion in which the end of the cage vertical bar is bent in the direction of the center of the cage. The other has a circumferential locking portion formed by bending the end of the cage vertical bar in the circumferential direction and biasing the bent tip toward the inside of the cage, and has the inward locking portion and the circumferential locking portion. Since the divided cages can be connected in a crossed state and the adjacent divided cages can be connected to each other, it is not necessary to increase the working space by dividing the cage itself, and it is necessary to replace or insert the filter cloth from the bag filter. Work can be performed easily even in a small space. In addition, the adjacent divided cages can easily and reliably connect to each other by locking the inward locking portion and the circumferential locking portion to each other, and can obtain a stable and strong connection state.

Further, in this filter cloth cage for a bag filter, the locking portions formed on each of the cage vertical bars do not protrude outward in the radial direction, and when the cage is inserted into the filter cloth, each locking section is formed. The cage can be configured as an integral structure cage by directly connecting the cage vertical rod itself during the insertion work into the filter cloth without damaging the filter cloth by the part, and a separate connecting member like a conventional filter cloth cage. Is not required, the number of components can be reduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a filter cloth cage for a bag filter according to the present invention in a separated state.

FIG. 2 is an explanatory view showing a state where a cage composed of a vertical cage rod is inserted into a filter cloth.

FIG. 3 is an explanatory view illustrating a step of connecting the cage vertical bars.

FIG. 4 is a schematic explanatory view showing an example of a bag filter type dust collector.

FIG. 5 is a schematic perspective view showing an example of a bag filter type dust collector.

FIG. 6 is a perspective view showing an example of a conventional filter cloth cage for a bag filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cage vertical bar 2 Cage vertical bar 3 Ring 4 Upper ring 5 Inward locking part 6 Circumferential locking part 7 Filter cloth 10 Cage 11 Upper cage 12 Lower cage 13 Lower ring

Claims (1)

(57) [Scope of request for utility model registration] 1. A longitudinal direction for holding a cylindrical filter cloth from inside.
A plurality of split cage is divided into, each minute
Split cage mounted on the ring and around the ring
A plurality of cages vertical bars that are composed of a bag filter for filter cloth cage, the split cage adjacent
On one side, the end of the cage vertical bar is bent toward the center of the cage.
The split hairs are have a direction locking portion in the adjacent to each other
Over other di-, the cage ends of the longitudinal bars bent in the circumferential direction, et al
Re and its bending have a circumferential locking portion formed to bias the cage inside the tip, the divided cage adjacent the <br/> the inward locking portion and the circumferential engaging portion with each other A filter cloth cage for a bag filter, characterized in that the filter cloth cage is configured to be locked and connected in a crossed state.