TWI485356B - Soot blower in passage and dust recovery apparatus - Google Patents

Description

Coal removal device and dust recovery device

The invention relates to a coal removal device and a dust recovery device in a flow path.

For example, in order to remove nitrogen oxides (NOx) in exhaust gas containing dust discharged from a thermal power plant, an exhaust gas denitration method using a selective contact reduction reaction using ammonia (NH ₃ ) as a reducing agent is used. The selective contact reduction reaction is to inject NH ₃ into the NOx contained in the exhaust gas and reduce it by the denitrification catalyst. Specifically, the flow path through which the exhaust gas flows through the exhaust pipe or the flow path casing that connects the exhaust pipe is denitrated by a lattice-shaped denitration catalyst.

The exhaust gas of a thermal power plant using coal as a fuel causes clogging of the denitration catalyst due to dust containing a large amount of unburned coal. In order to solve such a problem, for example, by disclosing the coal removing device (soot blower) of Patent Document 1, it is known that the coal is blown off in the flow direction of the exhaust gas.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Laid-Open Patent Publication No. 62-69015

However, depending on the nature of the coal and the operating conditions of the boiler, a finer flow path than the denitration catalyst is formed in the exhaust gas (the particle size is several mm to ten A coal block of a few mm) (hereinafter referred to as popcorn-like ash), which is clogged with a denitration catalyst, and has a problem that the fine flow path in which the denitration catalyst is formed in a lattice shape is closed. Unlike the particulate coal, since the popcorn-like ash has a larger gas flow path than the denitration catalyst, the conventional coal removal device cannot be blown along the flow direction of the exhaust gas. Therefore, in order to remove this, it is necessary to stop the device. And clean it with manpower.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fluid removal device in a flow path which can be removed even if dust is difficult to be removed by blowing of popcorn dust even if a fluid flows through the flow path. Dust recovery unit.

In order to solve the above problems, the present invention provides the following means.

The in-stream coal removing device of the present invention is a flow path casing that is provided in a fluid flow, and that the fluid flows through the flow path casing while removing the dust contained in the flow path casing and stored in the flow path casing. The in-street coal removal device is characterized in that the front end opening is opposed to the dust removing portion, and the suction pipe is connected to the base end side and the suction means for attracting dust while extending outward from the flow path casing. And a driving means for advancing and retracting the opening of the suction pipe in the flow path.

According to the above configuration, since the dust is sucked and removed through the suction pipe, dust can be prevented from accumulating in the removed portion.

In the above-described fluid removal device, the suction pipe includes a front end pipe having the opening facing the removal portion, and a base end and the suction hand The segment is connected, and the front end is inserted into the base end tube inside the front end tube, and the driving means can preferably advance and retreat the front end tube.

According to the above configuration, the front end pipe for advancing and retracting the suction pipe and the fixed base pipe are combined, and the base pipe is inserted into the front end pipe to reduce the occupied area of the suction pipe, so that the coal removal device in the flow path can be made small. Chemical.

In the above-described flow path internal coal removing device, the driving means may transmit the front end pipe forward and backward along the moving interlocking shaft provided in the front end pipe and the base end pipe.

According to the above configuration, since the system that flows the gas including the dust sucked by the tip end pipe is disposed separately from the system including the driving means, damage of the driving means due to the heat of the gas can be prevented.

In the above-described fluid removal device for a flow path, a dust-collecting net is provided in the removal portion in the flow path casing, and the opening of the suction pipe is preferably disposed opposite to the mesh.

According to the above configuration, it is possible to prevent dust larger than the mesh from affecting the downstream side of the net.

In the above-described fluid removal device for a flow path, it is preferable to include a pulverizing means for pulverizing the dust captured by the mesh.

According to the above configuration, it is easier to attract dust by the pulverization of the dust, and it is possible to pulverize the dust larger than the opening of the suction pipe and attract more dust.

In the above-described fluid removal device for a flow path, the removal unit is preferably provided with a blowing means for blowing a gas for removing dust.

According to the above configuration, the dust removing gas is blown toward the dust to float the dust, and the dust suction efficiency can be improved.

In the above-described flow path internal coal removing device, the removing portion is a lattice-shaped denitration catalyst in which a plurality of thin flow paths extend along the flow path casing, and the suction pipe is preferably provided on the upstream side of the denitration catalyst. .

It is preferable that the coal removing device in the flow path is a motor in which the driving means is separately provided with respect to the suction pipe.

According to the above configuration, damage to the motor due to heat of the gas containing dust can be prevented.

Moreover, the present invention provides a dust collecting device comprising: one of the above-described flow path coal removing devices; a dust distributing pipe connected to a proximal end side of the suction pipe; and a filter for capturing dust of the dust distributing pipe And the above means of attraction.

According to the above configuration, by providing the filter in the dust distribution pipe for discharging dust, it is possible to capture the dust attracted by the coal removal device in the flow path.

In the dust collecting device, it is preferable that the dust collecting pipe has a means for introducing a cooling gas on the upstream side of the filter.

According to the above configuration, by introducing the cooling air to lower the temperature of the fluid, it is possible to prevent the high-temperature fluid from affecting the filter.

According to the present invention, since the dust is sucked and removed through the suction pipe, dust can be prevented from accumulating in the removed portion.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings.

As shown in Fig. 1, the dust collecting device 1 of the present embodiment is, for example, a flow path case 4 provided in an exhaust pipe 2a of a boiler 2 that is connected to a coal-fired power plant to burn coal. The dust collecting device 1 is a dust such as coal that adheres to the denitration catalyst 3 (removing portion) attached to the inside of the flow path casing 4, and particularly a coal block having a large particle diameter of popcorn-like ash. The fluid is circulated through the flow path casing 4 for removal.

The denitration catalyst 3 is installed at least in the inside of the flow path casing 4 through which the exhaust gas of the fluid flows, and is in contact with the exhaust gas flowing through the flow path casing 4 to reduce nitrogen oxides (NOx) contained in the exhaust gas. For example, the denitration catalyst 3 is disposed at a predetermined interval to sequentially pass the exhaust gas.

As shown in FIG. 2, the cross-sectional shape orthogonal to the flow direction F of the exhaust gas of the denitration catalyst 3 is a rectangular shape, and the flow path case 4 is formed in accordance with the shape of the denitration catalyst 3. The denitration catalyst 3 has a predetermined thickness in the flow direction. The denitration catalyst 3 is formed with a plurality of thin flow paths 3a in a checkerboard shape along the flow direction F. The denitration catalyst 3 is displayed in a lattice shape from the flow direction F.

One end side and the other end side in the flow direction of the denitration catalyst 3 are flat surfaces (hereinafter referred to as end surface 3b), and the plurality of thin flow paths 3a are extended and connected to the end faces. The denitration catalyst 3 is installed such that the end face 3b of the denitration catalyst 3 is orthogonal to the outer wall 4a of the flow path casing 4.

As shown in Fig. 1, the dust recovery device 1 has an outer wall 4a fixed to the flow path casing 4, at least one flow path inner coal removing device 6 for one denitration catalyst 3, and coal removal in the discharge flow path. The dust processing unit 5 of the dust removed by the device 6.

The dust processing unit 5 includes a dust distribution pipe 7 that supplies a gas (hereinafter referred to as a gas) containing dust removed from the coal removal device 6 in the flow path, a bag filter 8 that replenishes the dust contained in the gas, and a dust transmission pipe 7 that passes through the dust distribution pipe 7 In the flow path, the coal removing device 6 generates a suction fan 9 as an attraction means.

The dust processing unit 5 is provided at least in the dust collecting device 1, and constitutes dust that can be sucked by the coal removing device 6 in the plurality of flow paths.

The in-stream coal removing device 6 is a device that sucks dust attached to the end surface 3b of the denitration catalyst 3 inside the flow path casing 4 by the negative pressure generated by the fan 9. The detailed structure of the in-stream coal removing device 6 will be described later.

Next, it is explained to the dust processing unit 5. The dust processing unit 5 is provided in one of the plurality of coal removing devices 6 in the plurality of flow paths, and selects one of the suction mechanisms generated by the fan 9 to act on one of the flow path removing devices 6 .

The dust distribution pipe 7 is a pipe that connects the coal removing device 6 and the fan 9 in the flow path. In the following description, the side of the coal removal device 6 in the flow path of the dust distribution pipe 7 is the upstream side, and the fan 9 side is the downstream side. The gas flowing into the fan 9 from the upstream side is sent to the flue via the fan 9.

A bag filter 8 for replenishing dust flowing through the dust distribution pipe 7 is provided in the dust distribution pipe 7. The bag filter 8 is, for example, a filter that deposits dust contained in the dust distribution pipe 7 on the surface of the nonwoven fabric by using a nonwoven fabric as a filter material. The dust replenished by the bag filter 8 is sent to the ash processing equipment.

A temperature transmitter 11 is provided on the upstream side of the bag filter 8, and the temperature of the gas introduced into the bag filter 8 is measured. The temperature transmitter 11 is connected to the temperature control device 12. An air introduction valve 13 through which air as a cooling gas can be introduced is provided on the upstream side of the temperature transmitter 11. Atmospheric introduction valve 13 is with temperature The control device 12 is connected.

When the temperature of the gas measured by the temperature transmitter 11 exceeds a predetermined temperature (for example, 200 ° C), the temperature control device 12 causes the air introduction valve 13 to be in an open state, whereby the air as the cooling gas can be introduced into the dust distribution pipe. 7 to lower the temperature of the gas.

A pressure transmitter 14 that measures the pressure in the dust distribution pipe 7 is provided on the upstream side of the air introduction valve 13. The pressure transmitter 14 is connected to the pressure control device 15. Further, on the downstream side of the bag filter 8, an attraction control valve 16 is provided on the upstream side of the fan 9. The attraction control valve 16 is connected to the pressure control device 15.

The pressure control device 15 is set to adjust the suction force control valve 16 so that the gas pressure measured by the pressure transmitter 14 forms a predetermined pressure.

The dust distribution pipe 7 on the upstream side of the pressure transmitter 14 is branched into a plurality of branch paths 7a, and is connected to the coal removal device 6 in the flow path. A switching valve 17 is provided in each branch path 7a. The switching valve 17 is a valve that is opened and closed by a control device (not shown). In the open state, the suction force of the fan 9 is generated in the flow path in the coal removing device 6, and the suction force of the fan 9 is cut off in the closed state.

Next, the detailed structure of the in-stream coal removing device 6 will be described.

As shown in Fig. 3 and Fig. 4, the in-stream coal removing device 6 has a blow pipe 21 having a front end pipe inserted into the flow path casing 4, and the front end opening is opened to the denitration catalyst 3, and the flow path is opened from the flow path. The suction pipe 20 that extends outward of the casing 4; and the outer casing 22 that is disposed outside the flow path casing 4 to accommodate a part of the suction pipe 20; and the drive mechanism 23 (driving means) that advances and retracts the blow pipe 21 are main constituent elements. The outer cover 22 is in the shape of an angled cylinder. And on the side of the outer cover 22 A terminal box 29 for accommodating a control board or the like is provided on the surface.

The in-stream coal removing device 6 is attached to the outer wall 4a of the flow path casing 4 through the wall box 24. Further, the in-stream coal removing device 6 is installed such that the longitudinal direction of the blow pipe 21 (hereinafter, simply referred to as the long direction) is along the end surface 3b of the denitration catalyst 3.

The suction pipe 20 has a blow pipe 21 and a feed pipe 25 (base pipe) embedded in the blow pipe 21. The feed pipe 25 is connected to the fan 9 (see Fig. 1) through the dust distribution pipe 7 on the base end side, i.e., the side opposite to the blow pipe 21 in the longitudinal direction. The feed pipe 25 is a member having a circular tube shape in which the base end side is supported in a cantilever shape on the outer cover 22, and the front end side is inserted into the inside of the circular tube-shaped blow pipe 21.

The blow pipe 21 is a member having a circular tube shape that is fitted to the front end side of the feed pipe 25 and is movable forward and backward in the longitudinal direction by the drive mechanism 23. The blow pipe 21 is composed of a blow pipe main body 26 that is combined with the feed pipe 25 along the longitudinal direction, and a suction pipe portion 27 that is provided at the front end side of the blow pipe main body 26. Moreover, the blow pipe 21 protrudes from the front end side of the outer casing 22 including the suction pipe portion 27, and penetrates the wall case 24 and is inserted into the inside of the flow path casing 4.

The blow pipe main body 26 is bent in the direction of the flow direction F of the flow path case 4 toward the denitration catalyst 3, and the suction pipe portion 27 is connected to the curved front end portion.

The suction pipe portion 27 has a circular pipe shape similar to that of the blow pipe main body 26, and has a longitudinal direction orthogonal to the longitudinal direction of the blow pipe main body 26, and is formed to be orthogonal to the flow direction F of the flow path casing 4. That is, the suction pipe portion 27 is formed along the end surface 3b of the denitration catalyst 3.

Both ends of the suction pipe portion 27 are closed. Further, a plurality of suction ports 28 are formed along the longitudinal direction of the suction pipe portion 27 on the side opposite to the denitration catalyst 3 of the suction pipe portion 27. The shape of the suction port 28 is an oblong shape along the longitudinal direction of the suction pipe portion 27.

The drive mechanism 23 includes a moving frame 30 attached to the base end of the blow pipe 21, a motor 33 provided outside the cover 22, and a sprocket and a chain for transmitting the power of the motor 33 to the moving frame 30.

As shown in Fig. 5, the base end of the blow pipe 21 is provided with a moving frame 30 that allows the blow pipe 21 to be freely reciprocated along the longitudinal direction of the cover 22. The moving frame 30 holds the base end of the blow pipe 21 and is formed in a shape covering the periphery of the feed pipe 25, and has a function of maintaining airtightness between the blow pipe 21 and the feed pipe 25.

A sealing member 31 that seals between the inner peripheral surface of the moving frame 30 and the peripheral surface of the feeding tube 25 is provided at a contact surface with the feeding tube 25 of the moving frame 30. As the sealing member 31, for example, a gland packing can be employed.

Further, a guide roller 40 that moves on the guide rail 32 provided along the longitudinal direction of the outer cover 22 is attached to the movable frame 30, whereby movement in the longitudinal direction of the blow pipe 21 held by the movable frame 30 can be performed. Further, the guide roller 40 is provided at a position where the limit switches ON and OFF can be performed by abutting the limit switches 45 and 46 which will be described later.

A motor 33 is disposed on the proximal end side of the outer cover 22 and outside the outer cover 22. A first sprocket 34 is attached to an output shaft of the motor 33, and a second sprocket 35 is attached to a proximal end side of the outer cover 22. A first chain 36 forming an oblong track is hung on the first sprocket 34 and the second sprocket 35. That is, the motor The power of 33 is transmitted to the first rotating shaft 37 that rotatably supports the second sprocket 35 through the first sprocket 34, the first chain 36, and the second sprocket 35.

A third sprocket 38 that rotates together with the second sprocket 35 is attached to the first rotating shaft 37 that is rotatably mounted to the proximal end side of the outer cover 22. A second rotating shaft 39 that avoids interference with the suction pipe 20 is attached to the front end side of the outer cover 22, and a rotatable fourth sprocket 41 is attached to the second rotating shaft 39. The second chain 42 is hung on the third sprocket 38 and the fourth sprocket 41, whereby the second chain 42 is formed into an oblong orbit along the longitudinal direction of the outer cover 22.

Further, the second chain 42 is coupled to the movable frame 30 via the transmission member 43.

With the above configuration, once the power of the motor 33 is transmitted to the first rotating shaft 37, the third sprocket 38 is rotated and the second sprocket 42 is rotated on its orbit. Since the second chain 42 is coupled to the moving frame 30, the second chain 42 moves on the track to move the moving frame 30 in the long direction. That is, by the power of the motor 33, the blow pipe 21 integrated with the moving frame 30 is moved in the longitudinal direction.

A reverse limit switch 45 is provided on the front end side of the outer cover 22, and a stop limit switch 46 is provided on the proximal end side of the outer cover 22. The configuration causes the limit switches 45, 46 to cut into the switch in accordance with the contact of the guide rolls 40 of the moving frame 30.

The limit switches 45 and 46 control the restriction of the movement range of the blow pipe 21 and the moving frame 30, and the forward and backward movements.

The wall box 24 is composed of a rectangular parallelepiped box main body 47 and a sealed box 48 attached to the proximal end side of the tank main body 47. The tank main body 47 is formed with a surface on which the blow pipe 21 penetrates toward the front end side and a surface facing the base end portion on the opposite side thereof. Through hole 49. A predetermined gap is provided between the through hole 49 and the blow pipe 21.

The seal case 48 is a box-shaped member having a rectangular parallelepiped shape and is provided on the proximal end side of the case main body 47. A high-pressure sealed air supply pipe 50 for sealing the high pressure sealing box 48 is connected to the sealed box 48. The gas supplied from the high pressure seal air supply pipe 50 flows through the gap between the through hole 49 on the proximal end side of the tank main body 47 and the outer peripheral surface of the blow pipe 21 in the tank main body 47.

Further, a mounting support 51 is extended on the proximal end side of the case main body 47, and is coupled to a mounting support 52 provided on the distal end side of the cover 22. A support roller 53 that supports the blow pipe 21 from below is provided on the front end side of the outer cover 22.

Next, the operation of the dust collecting device 1 according to the present embodiment will be described below.

First, when the motor 33 is started, the second chain 42 is moved by the rotational force of the motor 33, and the blow pipe 21 is moved in the longitudinal direction by the connecting member 43 and the moving frame 30 connected to the second chain 42. The blow pipe 21 is controlled by a control device (not shown) to advance to the cutting inversion limit switch 45 in the direction of the front end side, or to the cut stop limit switch 46.

While the blow pipe 21 is moving, the dust on the denitration catalyst 3 is sucked, and the dust-containing gas permeates into the dust distribution pipe 7 through the filter pipe 25. The pressure of the gas is measured by the pressure transmitter 14, which controls the attractive force control valve 16 to control the attractive force.

Further, the temperature of the gas is measured by the temperature transmitter 11, and the atmospheric introduction valve 13 is controlled corresponding to the temperature to control the temperature of the gas.

Next, the dust contained in the gas is supplied to the ash processing apparatus by the bag filter 8. The gas after the dust is removed is sent to the flue via the fan 9.

According to the above-described embodiment, the dust adhering to the denitration device 3, in particular, the structure in which the coal piece having the particle size of the popcorn-like ash is sucked and removed by the suction pipe 20 of the coal removal device 6 in the flow path can be prevented. Dust accumulates in the denitrification catalyst 3. Thereby, the continuous running time of the equipment can be further increased.

Further, since the dust in the flow path casing 4 is discharged to the outside of the flow path casing 4, the cleaning of the flow path casing 4 when the equipment is stopped is simplified.

By introducing the dust-laden gas from the coal removing device 6 in the flow path into the bag filter 8 through the dust distributing pipe 7, the dust is removed from the bag filter 8, and dust is prevented from affecting the atmosphere.

Further, by maintaining the inside of the sealed casing 48 at a higher internal pressure than the flow path casing 4, it is possible to prevent the exhaust gas from leaking from the insertion portion of the suction pipe 20.

Further, a predetermined gap is provided between the through hole 49 of the tank main body 47 of the wall box 24 and the blow pipe 21, and interference due to the difference in thermal expansion between the outer wall 4a and the blow pipe 21 due to the heat of the exhaust gas can be prevented.

Further, the motor 33 is disposed outside the outer casing 22 with respect to the suction pipe 20, thereby preventing damage of the motor 33 due to heat of the dust-containing gas.

Further, in the above embodiment, the case main body 47 is provided between the seal case 48 and the flow path case 4, but the case main body 47 of the wall case 24 may be omitted.

(Second embodiment)

Hereinafter, an in-flow coal removal device according to a second embodiment of the present invention will be described with reference to the drawings.

As shown in Fig. 6, the flow path inner coal removing device 6B according to the second embodiment is different from the flow path inner coal removing device 6 (see Fig. 3) of the first embodiment in that the suction pipe 20 and the wall box 24B are different in structure. .

The suction pipe 20B of the present embodiment has a moving interlocking shaft 55 that can advance and retreat in the longitudinal direction by the drive mechanism 23, and is disposed in parallel with the moving interlocking shaft 55, and the base end side is a cantilever that is supported by the wall box 24B. The tube 25B is provided in parallel with the moving interlocking shaft 55, and is connected to the blowing pipe 21B of the moving interlocking shaft 55.

The front end side of the feed pipe 25B is the inside of the insertion blow pipe 21B. The moving interlocking shaft 55 extends through the wall case 24B and extends inside the flow path casing 4 so that the front end thereof is connected to the blow pipe 21B. In other words, the forward and backward movement of the moving interlocking shaft 55 is configured to advance and retreat the blow pipe 21B in the longitudinal direction.

At the base end of the blow pipe 21B, while the inner peripheral surface of the blow pipe 21B and the outer peripheral surface of the feed pipe 25B are sealed, the blow pipe 21B can be made to look into the feed pipe 25B by the sealing mechanism 56 which expands and retracts the eyeglasses. A curved path seal 57 is provided on the contact surface with the feed pipe 25B of the sealing mechanism 56.

The blow pipe 21B is composed of a blow pipe main body 26B, a first suction pipe portion 58 provided at the front end of the blow pipe main body 26B, and a second suction pipe portion 59 provided at the base end of the blow pipe main body. That is, the blow pipe 21B of the present embodiment has two suction pipe portions 58, 59, and the first suction pipe portion 58 attracts the denitrification touch. The second suction pipe portion 59 attracts the other side of the denitration catalyst 3 in the longitudinal direction on the one side in the longitudinal direction of the medium 3.

In the case of the operation of the in-stream coal removing device 6B of the present embodiment, the moving interlocking shaft 55 is advanced and retracted in the longitudinal direction by the driving of the motor 33. Thereby, the blow pipe 21B connected to the moving interlocking shaft 55 can be advanced and retracted in the longitudinal direction.

According to the above embodiment, the gas containing the dust sucked by the blow pipe 21B is not sent to the dust distribution pipe 7 through the inside of the outer cover 22, and damage inside the outer cover 22 due to heat of the gas can be prevented.

Further, since the suction pipe portions 58, 59 are attached to the front end and the base end of the blow pipe 21B, they can be substantially half of the stroke of the blow pipe 21B as compared with the flow path internal coal removing device 6 of the first embodiment.

Fig. 7 is a partially enlarged view showing another form of the coal removing device in the flow path.

As shown in Fig. 7, the coal removing device 6C in the flow path of another embodiment is provided with a metal mesh 61 for replenishing dust on the upstream side of the denitration catalyst 3. The mesh size of the metal mesh 61 is a size that complements the size of the popcorn-like ash, which prevents the passage of the coal. Further, the metal mesh 61 is disposed in front of the denitration catalyst 3. Further, the suction port 28 of the blow pipe 21 is disposed opposite to the metal mesh 61.

Further, the blow pipe 21 of the in-stream coal removing device 6C of the present embodiment is provided with a brush 62 as a grinding means for dust grinding. Specifically, the brush 62 is a support portion 63 that protrudes from the blow pipe main body 26 toward the distal end side, and a plurality of metal wires 64 that are welded to the support portion 63, and the front of the metal wire 64 The end protrudes toward the metal mesh 61 and the denitration catalyst 3 side to abut against the metal mesh 61.

According to the above aspect, it is possible to prevent the large coal mass such as popcorn ash from reaching the denitration catalyst 3 disposed on the rear side of the metal mesh 61, and it is easy to clean the denitration catalyst 3 when the apparatus is stopped.

Further, the dust having a large particle size is pulverized by the brush 62, so that the dust is more easily attracted. Further, the dust larger than the suction port 28 is pulverized to attract more dust.

Fig. 8 is a partially enlarged view showing still another embodiment of the coal removing device in the flow path, and shows a top view of the blow pipe 21D and the suction pipe portion 27D from the direction along the flow direction F.

As shown in Fig. 8, the suction pipe portion 27D of the coal removing device 6D in the flow path of the present embodiment is connected to the blow pipe main body 26 of each of the above embodiments, and the second blow pipe 66 constituting the injection pipe 65 is connected, and the injection pipe is configured. A high-pressure gas that ejects the dust removing gas to the denitration catalyst 3 can be supplied.

The injection pipe 65 has substantially the same configuration as that of the suction pipe 20, and differs in that suction is sucked from the suction pipe portion 27D by the suction force of the fan 9 with respect to the suction pipe 20, and the injection pipe 65 is sucked from the suction pipe portion by high-pressure gas. The suction port 28 of the 27D ejects air.

According to the above aspect, the high-pressure gas is injected from the suction port 28 of the suction pipe portion 27D at a stage before the dust is sucked, so that the dust is floated, and the dust can be more easily attracted during the subsequent suction.

The form for supplying the high-pressure gas is not limited thereto, and as shown in Fig. 9, the injection pipe portion 67 may be separately provided, and the injection pipe portion 67 is connected to the injection pipe 65 for supplying the high-pressure gas. As shown in Figure 9, the injection tube 67 may also be provided with two components sandwiching the suction pipe portion 27D.

Further, the medium to be ejected is not limited to high-pressure air, and for example, it is also possible to eject high-pressure steam to make the dust into a floating state.

In addition, the technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. For example, the method of removing dust contained in the gas is not limited to the bag filter, and the dust in the gas may be separated using a dust separator (cyclone separator). Alternatively, on the dust distribution pipe 7, the dust in the gas is not removed, but the gas is again placed in the apparatus to prevent the processing from being hindered.

Moreover, the dust collecting apparatus according to each of the above embodiments can be used not only for popcorn ash but also for collecting various types of dust as long as it can be sucked by the suction pipe.

1‧‧‧Dust recovery unit

2‧‧‧Boiler

2a‧‧‧Exhaust pipe

3‧‧‧Denitration catalyst

4‧‧‧Flow path housing

5‧‧‧Dust Processing Department

6‧‧‧In-stream coal removal device

7‧‧‧Dust distribution tube

8‧‧‧ bag filter (filter)

9‧‧‧Fan (attraction means)

11‧‧‧Temperature transmitter

12‧‧‧ Temperature control device

13‧‧‧Atmospheric introduction valve

14‧‧‧Pressure transmitter

15‧‧‧ Pressure control device

16‧‧‧Attraction control valve

17‧‧‧Switching valve

20‧‧‧Inhalation tube

21‧‧‧Blowpipe (front end tube)

22‧‧‧ Cover

23‧‧‧Drive mechanism (driver)

24‧‧‧ wall box

25‧‧‧Feed tube (base tube)

33‧‧‧Motor

61‧‧‧Metal net (net)

Fig. 1 is a system diagram of a dust collecting device according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a denitration catalyst of the dust collecting device.

Fig. 3 is a side view showing a coal removal device in a flow path according to a first embodiment of the present invention.

Fig. 4 is a view showing the direction of arrow A in Fig. 3, and a top view of the coal removing device in the flow path according to the first embodiment of the present invention.

Fig. 5 is an enlarged view of a portion B of Fig. 3.

Fig. 6 is a side view showing a coal removing device in a flow path according to a second embodiment of the present invention.

Figure 7 is a partial enlargement showing other forms of the coal removal device in the flow path. Figure.

Fig. 8 is a partially enlarged view showing still another embodiment of the coal removing device in the flow path.

Fig. 9 is a partially enlarged view showing still another embodiment of the coal removing device in the flow path.

3‧‧‧Denitration catalyst

3b‧‧‧ end face

4‧‧‧Flow path housing

4a‧‧‧ outer wall

6‧‧‧In-stream coal removal device

7‧‧‧Dust distribution tube

20‧‧‧Inhalation tube

21‧‧‧Blowpipe (front end tube)

22‧‧‧ Cover

23‧‧‧Drive mechanism (driver)

24‧‧‧ wall box

25‧‧‧Feed tube (base tube)

26‧‧‧Blowing pipe body

27‧‧‧Inhalation Pipe Department

29‧‧‧Terminal box

33‧‧‧Motor

34‧‧‧First sprocket

35‧‧‧Second sprocket

36‧‧‧First chain

37‧‧‧First shaft

38‧‧‧ Third sprocket

39‧‧‧second shaft

41‧‧‧fourth sprocket

42‧‧‧Second chain

45‧‧‧Limit switch

47‧‧‧ box body

48‧‧‧ sealed box

49‧‧‧through holes

50‧‧‧High pressure sealed air supply pipe

53‧‧‧Support roller

Claims (10)

A flow path internal coal removing device is disposed in a flow path casing through which a fluid flows, and the fluid flows through the flow path casing to remove a flow path for dust contained in the flow path casing. The coal removing device is characterized in that the suction pipe is provided with a suction pipe, and the front end opening is opposed to the dust accumulation portion, and extends from the flow path casing to the outside, and is connected to the base end side and the suction means for attracting dust, and the driving means The opening of the suction pipe is advanced and retracted in the flow path, and the sealed box is maintained at a high pressure therein, and the suction pipe is inserted through the sealed box and connected to the flow path casing, and the dust in the flow path casing passes through the above The suction pipe is discharged from the opening and the fluid flowing through the flow path casing to the outside of the flow path casing. The in-stream coal removing device according to claim 1, wherein the suction pipe includes a front end pipe having the opening facing the stacking portion, and a base end connected to the suction means, and a tip end inserted into the front end pipe The inner base pipe, the driving means causes the front end pipe to advance and retreat. The in-stream coal removing device according to claim 2, wherein the driving means moves the front end pipe forward and backward through a moving interlocking shaft provided along the front end pipe and the base end pipe. The in-stream coal removing device according to any one of the first to third aspect, wherein the depositing portion in the flow path casing A net for catching dust is provided, and the opening of the suction pipe is disposed opposite to the net. The in-stream coal removing device according to the fourth aspect of the invention, wherein the coal removing device for crushing the dust captured by the net is provided. The in-flow coal removal device according to any one of the first to third aspect of the invention, wherein the deposition unit includes a blowing means for blowing a gas for removing dust. The in-stream coal removal device according to any one of the first to third aspect, wherein the accumulation portion is a lattice-shaped denitration catalyst extending along the flow path casing in a plurality of thin flow paths. The suction pipe is disposed on the upstream side of the denitration catalyst. The in-flow coal removing device according to any one of the first to third aspect, wherein the motor constituting the driving means is provided separately from the suction pipe. A dust collecting device according to any one of claims 1 to 8, further comprising: a dust distribution pipe connected to a proximal end side of the suction pipe; a dust filter for the dust distribution pipe; and the above suction means. In the dust collecting device according to the ninth aspect of the invention, the dust collecting pipe is provided with means for introducing a cooling gas on the upstream side of the filter.