JPH1038252A - Dust removal equipment for exhaust duct vertical part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectually remove dust even with a long vertical part duct and also reduce pressure loss of exhaust gas. SOLUTION: There are provided an elevation member provided elevatably in a vertical part duct 10, and an elevation driving apparatus for elevating and moving the elevation member through an elevation chane 13. The elevation member includes a pair of link arms 23 coupled rotatably around a horizontal pin 22, and scraper halved rings 21 each mounted on upper ends of both link arms 23 along an internal peripheral surface of the vertical part duct 10, a coupling chane 24 for rotatably coupling the lower ends of both link arms 23 and the elevation chane 13, and a stopper 25 for restricting an opening motion to an outer periphery side of the link arms 23 at a position near the internal peripheral surface of the vertical part duct 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removing device for a vertical portion of an exhaust duct for scraping off dust attached to the inner surface of an exhaust duct in a large amount with high-temperature exhaust gas such as an ash melting furnace.

[0002]

2. Description of the Related Art Conventionally, for example, in an ash melting furnace in which incineration ash (incineration residues and dust ash) discharged from a refuse incinerator is melted to reduce its volume and render it harmless, a heating source is a burner type or an electric type. Regardless of the plasma type, the proportion of fly ash and low-boiling volatiles (hereinafter referred to as dust) in the exhaust gas is extremely large. This is because the melting furnace itself has a very high temperature of 1400 to 1500 ° C. Normally, exhaust gas containing a large amount of dust is discharged after cooling and removing dust. However, there is a problem that dust adheres and solidifies and accumulates in the duct to close the duct.

[0003] Therefore, in the vertical portion of the exhaust gas duct, FIG.
As shown in the figure, while the vertical duct 51 is a water-cooled jacket, a plurality of chains 52 hang from the upper end,
The chain 52 is rotated by a rotation motor 53 into a rotating member 54.
There is a dust removing device that rotates around a vertical axis through the shaft and uses the centrifugal force to make the chain contact the inner surface of the vertical duct 51 to scrape off dust adhering to the inner surface.

[0004]

However, in the above dust removing equipment, especially when the length of the chain 52 is long, the lower portion becomes unstable, and the removing ability is reduced, so that it is not suitable for a long duct. Further, if the length of the chain 52 is long, the volume occupied in the duct also increases, and there is a problem that the pressure loss in the flow passage of the duct increases. Furthermore, since there is a possibility that a portion of the chain 52 may be damaged by contact with the chain 52, there is a problem that a device in a duct such as a thermometer cannot be arranged.

According to the first aspect of the present invention, the above problems are solved and the pressure loss in the duct flow path is small,
An object of the present invention is to provide a dust removal device for a vertical portion of an exhaust duct that can operate even during operation of a melting furnace and can be applied to a long vertical portion.

[0006]

According to a first aspect of the present invention, there is provided an elevating member which is provided in a vertical duct of an exhaust duct so as to be able to ascend and descend. An elevating drive device which is movable up and down through a body, wherein the elevating member comprises a pair of link arms rotatably connected about a horizontal pin, and an exhaust duct attached to upper ends of both link arms, respectively. A scraping member along the inner peripheral surface of the arm, a connecting member for connecting the lower ends of both link arms and the cable body, and an outer periphery of the link arm at a position where the scraping member approaches the inner peripheral surface of the vertical duct. And a stopper for restricting the opening movement to the side.

According to the above construction, when the rope body is extended by the lifting drive device and the lifting member is lowered, the scraping member comes into contact with dust adhering to the inner surface of the vertical duct and is roughly cut. If the resistance at this time is large, the resistance causes the link arm to rotate in the closing direction, so that the gap between the duct and the inner surface of the vertical duct becomes large, the resistance decreases, and the duct descends smoothly. When the lifting member is lifted from the lower limit, the scraping member comes into contact with dust on the inner surface of the vertical duct and is urged to rotate in a direction in which the link arm opens, and the stopper approaches the inner circumferential surface of the duct. The opening movement is restricted by the position. Thus, when the elevating member is lifted, the scraping member surely scrapes off the dust adhering to the inner surface of the duct, and can effectively remove the dust. Therefore, dust can be uniformly removed even if the length of the vertical duct is long. The elevating member has a simple configuration including a scraping member and a link arm along the inner peripheral surface of the duct, does not cover the entire flow path, has a small volume to block the flow path, and has a small pressure loss.

According to a second aspect of the present invention, a storage section for a lifting member is formed at the upper end of the vertical duct having the above-described structure by branching off from the flow path of the exhaust duct. According to the above configuration, when the dust removal equipment is not used, the pressure loss of the vertical duct can be almost eliminated.

Further, according to a third aspect of the present invention, a pressure gauge for detecting exhaust gas pressure is disposed on each of the vertical section upstream and downstream of the vertical section duct having the above structure, and a difference between the upstream side pressure gauge and the downstream side pressure gauge is provided. When the pressure becomes equal to or more than a certain value, the dust removing control that drives the lifting / lowering drive device to move the lifting / lowering member up / down along the vertical duct, and scrape off the dust adhered to the inner surface of the vertical duct by the scraping member. A device is provided.

[0010] According to the above configuration, since it can be automatically performed appropriately according to the pressure loss of the exhaust gas due to the adhesion of dust, labor saving and automation can be further promoted. Further, the invention according to claim 4 is characterized in that the equipment in the duct arranged in the moving range of the elevating member of the vertical duct having the above-described configuration is disposed inside the inner surface of the vertical duct so as to be able to move out and back. A device evacuation device for retracting the internal device from inside the vertical duct is provided, and the dust removal control device drives the device evacuation device when the elevating member moves up and down so that the device in the duct is retracted from the vertical duct. Things.

According to the above configuration, even if equipment in the duct such as a thermometer protruding from the inner surface of the vertical duct is disposed in the dust removal range by the elevating member, it can be evacuated by the equipment evacuation device when the elevating member moves. Since it is possible, the equipment in the duct can be arbitrarily arranged without damaging the equipment in the duct.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a dust removing facility for a vertical portion of an exhaust gas duct according to the present invention will be described with reference to FIGS.

As shown in FIG. 1, reference numeral 1 denotes an ash melting furnace for heating and melting incineration ash discharged from a refuse incinerator by a heating source such as a burner, an arc or plasma. A slag discharge chamber 4 and a secondary combustion chamber 5 are provided through a slag discharge port 3 having 3a. The slag discharge chamber 4 is provided with an auxiliary burner 6 for preventing the solidification of the molten slag against the discharge weir 3a. At the lower end thereof, the molten slag dropped from the discharge weir 3a is water-cooled and granulated. A slag cooling device 7 for generating slag is provided. The secondary combustion chamber 5 is provided with a secondary combustion burner 8 for burning the unburned portion of the exhaust gas discharged from the melting chamber, and a vertical duct 10 constituting an exhaust gas duct 9 is connected to the top. I have.

The vertical duct 10 has a cylindrical shape and is provided with a dust removing device 11 for automatically removing dust adhering to the inner surface of the vertical duct. This dust removal device 1
1 is an elevating member 12 that can move up and down in the vertical duct 10
And an elevating drive device 14 that drives the elevating member 12 up and down via an elevating chain 13 which is an example of a cord body. The elevating chain 13 may be a member having strength and heat resistance and capable of being wound, for example, a wire rope.

As shown in FIGS. 2 and 3, the lifting member 10 is rotatable via a pair of substantially semi-circular half-cutting rings 21 and 21 serving as a scraping member and a horizontal pin 22. A pair of link arms 23, 23 connected to each other to open and close the scraping half ring 21 at an upper end 23a, a lower end 23b of these link arms 23, and a lifting chain 1
And a stopper 25 for restricting the opening movement of the link arm 23 at a position where the scraping half ring 21 approaches the inner surface of the vertical duct. , 25.
Here, the connecting chain 24 may be any as long as it can support the link arm 22 so as to be able to open and close, and may be constituted by a pair of link plates or rods.

The scraping half ring 21 is formed to have an outer diameter slightly smaller than the inner diameter of the vertical duct 10, and each end is partially cut out so as to be able to be closed by the link arm 23. ing. The link arm 22 is
It is connected to the center of the scraping half ring 21 and is rotatably supported by a horizontal pin 22 in a plane passing through the axis of the vertical duct 10. At the lower end of the link arm 23, a mounting member 26 is respectively protruded, and a connecting chain 24 is rotatably connected to the mounting member 26. The connecting chain 24 moves up and down through the inside of the scraping half ring 21. It is connected to a chain 13.

Therefore, when the elevating member 12 is lowered,
When the scraping member 24 comes into contact with the inner surface of the vertical duct 10,
While the dust adhering to the inner surface is roughly removed, the link arm 23 is pivoted upward to close the scraping half ring 21 as shown by the phantom line, and the gap with the inner surface of the vertical duct 10 increases. It descends smoothly. When the elevating member 12 is lifted, the stopper 25 restricts the rotation of the link arm 23 in the downward direction.
Since the opening movement is restricted at a position where the first member 1 approaches the inner surface of the vertical duct 10, the scraping half ring 21 can surely scrape and remove dust adhering to the inner surface.

At the upper end of the vertical duct 10, there is formed an elevating member accommodating portion 15 extending upward from the exhaust gas path detouring to the side.
Is configured to accommodate the elevating member 12 when not in use. An elevating chain insertion hole 16 is formed at the top of the elevating member housing 15. The lifting drive 12
Comprises a take-up drum 27 for taking up the elevating chain 13, and a take-up motor 28 for driving the take-up drum 27 forward and reverse through a speed reduction mechanism.

A pressure gauge 31A, which detects exhaust gas pressure, is provided on the inlet side and downstream side of the vertical duct 10, respectively.
31B are respectively provided, and the differential pressure of the exhaust gas on the inlet side and the differential pressure of the exhaust gas on the outlet side are
To be output to This vertical duct 1
At 0, an exhaust gas thermometer 34, which is an example of a device in a duct, is provided. The exhaust gas thermometer 34 is configured to be retractable from a state in which the exhaust gas thermometer 34 is projected into the vertical duct 10 by the device retracting device 35. That is, as shown in FIG. 4, a purge insertion tool 37 in which a purge air air supply port 37a is formed in a through hole 36 formed in the vertical duct 10.
Is attached, and a purge member 37 is attached to the purge insertion tool 37.
The thermometer 34 is inserted so as to be able to move in and out via the. The base end of the thermometer 34 is supported by a support frame 39, and the piston rod of the retractable cylinder device 40 is supported by the support frame 3.
9 to form a device retraction device 35.

When the differential pressure signal of the differential pressure support meter 32 becomes equal to or more than a predetermined value, the dust removal control device 33 determines that dust has adhered and accumulated in the vertical duct 10, and the lifting drive device In addition to driving the thermometer 14, the device retracting device 35 is operated to retract the protruding thermometer 34.

In the above configuration, the exhaust gas pressure is detected by the pressure gauges 31A and 31B on the inlet side and the outlet downstream side of the vertical duct 10, respectively. 33. Then, when the differential pressure signal of the differential pressure support meter 32 becomes equal to or more than a certain value, the elevator drive device 14 is driven and the device retracting device 35 is operated. In the device retracting device 35, the retractable cylinder device 40 is contracted, and the thermometer 34 is moved to the vertical duct 1.
It is retracted from within 0.

In the dust removing device 11, the take-up motor 28 is driven, the elevating chain 13 is extended from the take-up drum 27, and the elevating member 12 is lowered from the elevating member accommodating portion 15 to the vertical duct 10. At this time, when the scraping member 24 comes into contact with the inner surface of the vertical duct 10, the dust adhered to the inner surface is roughly removed, and the link arm 23 is rotated upward in the direction of the arrow A by the resistance at that time, so that the scraping half is performed. The split ring 21 is closed as indicated by the phantom line, the gap is widened, the resistance is reduced by half, and the elevating member 12 is smoothly lowered. When the elevating member 12 reaches the entrance of the vertical duct 10, the winding motor 28 is temporarily stopped, and the elevating member 12 is stopped. Next, take-up motor 2
8 is driven in reverse, and the lifting chain 13 is
Is wound up, and the elevating member 12 is raised. At this time, dust adhering to the inner surface of the vertical duct 10 comes into contact with the scraping half ring 21 and is scraped off. At this time, the scraping material 21 and the link arm 23 are rotated in the opening direction indicated by the arrow B due to the resistance at this time, but the stopper 25 stops the link arm 23 at the position where the scraping half ring 21 approaches the inner surface of the vertical duct 10. Is restricted, the scraping half ring 21 can effectively scrape and remove dust, and fall and discharge into the lower secondary combustion chamber 5. As described above, the lifting member 12 is pulled up in the vertical duct 10 at a predetermined speed, so that the dust attached to the inner surface of the vertical duct 10 is satisfactorily removed by the scraping half ring 21. In addition, there is a portion that is cut out in a state where the scraping half ring 21 is opened, and a portion that cannot be removed at one time occurs. Can be used to remove dust over the entire periphery.

According to the above-described embodiment, since the lifting member 12 having the scraping half ring 21 is moved up and down in the vertical duct 10, dust can be removed satisfactorily over a long stroke. The elevating member 12 is formed of a circular plate along the inner surface of the vertical duct 10 and has a simple configuration using two link arms 23 and a connecting chain 24. Since there are few obstacles and a small pressure loss, dust can be removed even during operation of the ash melting furnace 1. Furthermore, when not in use, the elevating member 12 is made to stand by in the elevating member accommodating portion 15, so that there is almost no pressure loss of exhaust gas. In addition, since the pair of scraping half rings 21 are supported by the link arms 23 for opening and closing, when descending using their own weight, they can be rotated in the closing direction so that they can be smoothly lowered without being caught in the middle. Also, when pulling up, the stopper 25 is used to scrape the half ring 2
By restricting 1 at a predetermined position, the dust can be lifted up without being caught in the middle and the dust can be reliably scraped off.

Further, the dust removal control device 33 controls the dust removal device 1 based on the detection values of the pressure gauges 31A and 31B.
1 can be operated, and the device in the duct such as the thermometer 34 can be retracted from the inside of the vertical duct 10 by operating the device retracting device 35, so that automation and labor saving can be achieved.

[0025]

As described above, according to the first aspect of the present invention, when the rope drive unit pulls out the rope body and lowers the lifting member, the dust attached to the inner surface of the vertical duct is reduced. It is roughed by contact with. If the resistance at this time is large, the resistance causes the link arm to rotate in the closing direction, so that the gap between the duct and the inner surface of the vertical duct becomes large, the resistance decreases, and the duct descends smoothly. When the lifting member is lifted from the lower limit, the scraping member comes into contact with dust on the inner surface of the vertical duct and is urged to rotate in a direction in which the link arm opens, and the stopper approaches the inner circumferential surface of the duct. The opening movement is restricted by the position. This allows
When the elevating member is lifted, the scraping member surely scrapes off the dust adhered to the inner surface of the duct, and can effectively remove the dust. Therefore, dust can be uniformly removed even if the length of the vertical duct is long. The elevating member has a simple configuration including a scraping member and a link arm along the inner peripheral surface of the duct, does not cover the entire flow path, has a small volume to block the flow path, and has a small pressure loss.

According to the second aspect of the present invention, the pressure loss of the exhaust duct can be substantially eliminated when the dust removing equipment is not used. Further, according to the configuration of the third aspect, since it can be automatically performed appropriately according to the pressure loss of the exhaust gas due to the adhesion of dust, labor saving and automation can be further promoted.

Further, according to the structure of the fourth aspect, even if equipment in the duct such as a thermometer projecting from the inner surface of the duct is arranged in the dust removal area by the elevating member, the equipment evacuation device is evacuated when the elevating member moves. Therefore, the equipment in the duct can be arbitrarily arranged without damaging the equipment in the duct.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a dust removal facility for a vertical portion of an exhaust duct according to the present invention.

FIG. 2 is a side sectional view of the lifting member.

FIG. 3 is a plan view of the lifting member.

FIG. 4 is a side sectional view of the thermometer.

FIG. 5 is a side sectional view showing a conventional dust removing facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ash melting furnace 5 Secondary combustion chamber 9 Exhaust gas duct 10 Vertical duct 11 Dust removal device 12 Elevating member 13 Elevating chain (cord body) 14 Elevating drive device 15 Elevating member housing 21 Scrape half ring (scraping member) Reference Signs List 22 horizontal pin 23 link arm 24 connecting chain (connecting member) 25 stopper 27 take-up drum 28 take-up motor 31A, 31B pressure gauge 32 differential pressure support meter 33 dust removal control device 34 exhaust gas thermometer (equipment in duct) 35 equipment refuge apparatus

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiro Sakata 5-3-28 Nishikujo, Konohana-ku, Osaka City, Osaka Inside Hitachi Zosen Corporation

Claims (4)

[Claims] 1. An elevating member which is provided in a vertical duct of an exhaust duct so as to be able to move up and down, and an elevating drive device which is capable of moving the elevating member up and down via a cable body. A pair of link arms rotatably connected to the center, a scraping member attached to the upper ends of both link arms and along the inner peripheral surface of the exhaust duct, the lower ends of both link arms and the cable body, And a stopper that regulates the opening movement of the link arm to the outer peripheral side at a position where the scraping member approaches the inner peripheral surface of the vertical duct. Dust removal equipment. 2. The dust removing equipment for a vertical portion of an exhaust duct according to claim 1, wherein a storage portion for a lifting member is formed at an upper end portion of the vertical portion duct by branching from a flow path of the exhaust duct. 3. A pressure gauge for detecting exhaust gas pressure is provided at each of an inlet side and an outlet side of the vertical duct, and when a pressure difference between the inlet side pressure gauge and the outlet side pressure gauge becomes equal to or more than a predetermined value, A dust removal control device for driving a lifting / lowering drive device to move the lifting / lowering member up / down along the vertical duct and scraping off dust adhered to the inner surface of the vertical duct by a scraping member is provided. 3. A dust removal facility for a vertical portion of an exhaust duct according to 1 or 2. 4. A device in a duct, which is disposed within a range of movement of the elevating member of the vertical duct, is disposed inside the inner surface of the vertical duct so as to be freely retractable, and the device in the duct is moved from the inside of the vertical duct. 4. The apparatus according to claim 3, further comprising a device retracting device for retracting, wherein the dust removing control device drives the device retracting device when the elevating member moves up and down so as to retract the device in the duct from the vertical duct. Dust removal equipment for the vertical part of the exhaust duct described.