JPH06220456A - Entrance into gas circulation system, and circulation shutoff unit - Google Patents

Abstract

PURPOSE:To provide a method for entering a cyclone, a circulating blower or a gas duct to safety inspect and repair the same for a short period of time while the circulating blower is stopped in a state of red-hot coke remaining charged in the cooling tower of coke dry quenching facilities, by providing therefor a specific constitution. CONSTITUTION:A method for entering a cyclone 2, a circulating blower 3 or a gas duct 4 while the circulating blower 3 is stopped in a state of red-hot coke remaining charged in the cooling tower of coke dry quenching facilities, wherein heat-resistant balloon tubes A and B are inserted into the gas duct 4 of a gas circulation system at two positions thereof on the outlet side of a boiler 1 and on the blowout side of the circulating blower 3, respectively, and then filled with compressed air to thereby shut off the primary side from the secondary side, which is then purged with air. Thereafter, engineers enter the gas duct 4 or the like. The heat-resistant balloon tubes A and B are pref. positioned with stoppers 6, 11 and 12 in the duct, and then filled with air via compressed air feeding pipings 8 and 14 linked to the tubes A and B, respectively, to be inflated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for entering a cyclone, a circulation blower or a gas duct in a gas circulation system of a coke dry fire extinguishing system, and a gas duct shutoff device.

[0002]

2. Description of the Related Art In a coke dry fire extinguishing system, as shown in FIG. 5, a red hot coke 54 is charged through a charging port 53 at the top of a prechamber 52 above a cooling chamber 51, and a gas blowing device 55 below the cooling chamber 51. It is cooled by bringing it into countercurrent contact with an inert cooling gas mainly consisting of nitrogen gas blown from the coke, and the cooled coke is the coke cutting device 5 at the lower end.
6 to discharge from the cooling chamber 51. Red hot coke 54
The inert cooling gas having a high temperature due to heat exchange with the is introduced from the small flue 57 in the upper part of the cooling chamber 51 to the boiler 60 via the annular flue 58 and the flue 59 on the outer circumference of the prechamber 52, and the heat is recovered. . The inert cooling gas, which has been heat-recovered by the boiler 60 and cooled, is blown from the gas blowing device 55 below the cooling chamber 51 through the circulation blower 62 after the residual dust is removed by the cyclone 61.

On the inner surface of the cyclone of the coke dry fire extinguishing equipment, a basal liner is lined to prevent wear due to coke dust in the inert cooling gas. The basal liner and the joint may be locally worn by coke dust in the inert cooling gas, and holes may be generated in the steel skin. If air is sucked into the gas circulation system from this hole, abnormal combustion will occur inside the cooling chamber, so it is necessary to check and repair the local wear parts of the Basal liner and joints. Further, in the circulation blower, the blades may wear and become unbalanced, and runner vibration may occur. In this case, it is necessary to attach balance weights to the blades to correct the balance. The cyclone and the circulation blower are not regularly inspected and repaired like a boiler, but are inspected and repaired irregularly.

When a boiler, a cyclone, a circulation blower of a coke dry fire extinguisher or a gas circulation duct between the outlet of the boiler and the discharge side of the circulation blower is inspected and repaired, the red hot coke in the cooling tower is cooled. After exhausting completely, the cooling gas is introduced into the gas circulation system while the circulation blower is operating, and the circulation gas is discharged from the gas circulation system to cool the fire extinguisher tower and the gas circulation system to room temperature. Cooling the fire extinguisher and gas circulation system to room temperature must be done at a low cooling rate to prevent damage to the refractory lining the fire extinguisher, and after introducing cooling gas into the gas circulation system, And it takes about 3 days to cool the gas circulation system to room temperature. In addition, after entering the gas circulation system duct between the boiler, cyclone, circulation blower or the outlet of the boiler and the discharge side of the circulation blower for inspection and repair, the coke dry fire extinguishing equipment should be returned to normal operation even after It has been cooled down to the above, and the temperature must be raised at a low heating rate in order to prevent damage to the refractory lining the fire extinguisher, which requires about 3 days.

Frequently repeating the cooling of the fire extinguisher and the gas circulation system to room temperature and the temperature increase from room temperature cause cracks in the refractory lining the fire extinguisher. For this reason,
With the circulation blower stopped while the fire extinguisher is filled with red-hot coke, a safe way to enter the cyclone, the circulation blower, or the gas circulation system duct between the boiler outlet and the circulation blower discharge side is to use gas circulation downstream of the boiler. When inspecting and repairing the cyclone, circulation blower and gas duct in the system duct line, install a stop plate on the gas duct at the specified position to completely prevent air from leaking into the fire extinguisher tower and then perform an internal inspection and repair. We are repairing. However, the work of attaching the closing plate to the gas duct at a predetermined position requires 6 to 7 hours, which lowers the work efficiency.

[0006] As another method of entering the boiler section with the red hot coke filled in the fire extinguishing tower of the coke dry fire extinguishing equipment, the circulating blower is stopped with the red hot coke filled in the fire extinguisher tower of the coke dry extinguishing equipment. Open the emergency gas diffusion valve provided downstream of the dust remover of the circulating gas duct from the fire extinguisher to the boiler section, and introduce an inert gas into the fire extinguishing tower and the boiler section to remove unburned gas from the emergency gas diffusion valve. The heat-resistant powder and granules are loaded into the dust remover that has a dust cutting device installed in the circulating gas duct from the fire extinguisher to the boiler section, and the circulating gas collision body in the dust remover is buried. Cut off the gas passage from the fire extinguisher of the dust remover to the boiler section, and stop the introduction of inert gas into the boiler section while adjusting the internal pressure of the fire extinguishing tower by adjusting the valve opening of the furnace top gas diffusion valve of the fire extinguisher. Then How entering a boiler unit introduced retirement gas by cooling the boiler unit (JP 63-83194
Issue).

As a gas circulation system breaker for coke dry fire extinguishing equipment, the upper part of the coke fire extinguishing room and the gas inflow side of the boiler are connected via a dust remover, and the gas outflow side of the boiler is arranged. A circulation blower is installed in the middle of the pipe,
In a coke dry fire extinguishing system in which the end of the pipe is connected to the lower part of the fire extinguishing chamber, a device provided with a removable hot gas shut-off device in the communication passage between the boiler and the dust remover (actual exploitation 61 No. 176238) has been proposed. Further, as a gas water sealing device, in a box having a closed structure containing water, a primary side gas duct is guided from above to position the tip of the primary side gas duct below the water surface in the box, and a secondary side gas duct. Is positioned above the water surface in the box, the gas pressure in the primary side gas duct and the gas pressure in the secondary side gas duct are reversed, the gas pressure in the primary side gas duct is the secondary A device that raises the water in the box into the primary side gas duct to a water level corresponding to the pressure difference when the gas pressure in the side side gas duct drops, and seals the primary side gas duct with water. -73641) is proposed.

[0008]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to the method disclosed in Japanese Patent No. 194, the heat-resistant powder and granules are charged into the dust remover and the circulating gas collision body is embedded to block the gas passage from the fire extinguisher tower of the dust remover to the boiler part. When the recovered coke dust is directly used as the granular material, it is considered that the heat-resistant granular material will not be suspended due to problems such as dew condensation, but ceramic beads or lime powder was used as the heat-resistant granular material. In this case, it is feared that the contained moisture contained therein may evaporate and the beads such as ceramic beads and lime powder may be suspended due to dew condensation. In addition, the actual development 61-
In the shutoff device disclosed in Japanese Patent No. 176238, it takes time to carry in and carry out the hot gas shutoff device, and there is a concern that the hot gas shutoff device insertion portion of the communication passage between the boiler and the dust remover may be damaged. To be done. Furthermore, the actual Kaisho 61-73
The device disclosed in Japanese Patent No. 641 requires a large modification of the gas circulation system of the existing coke dry fire extinguishing equipment, and is not a good idea.

An object of the present invention is to introduce a cyclone of a coke dry fire extinguishing system, a circulation blower or a gas circulation system between the outlet of a boiler and the discharge side of the circulation blower, into which a gas circulation system duct can be easily entered, and It is to provide a circuit breaker.

[0010]

Means for Solving the Problems The inventors of the present invention have conducted various tests and examinations in order to achieve the above object. As a result, heat-resistant balloon tubes were inserted in two places in the gas circulation system ducts on the boiler outlet side and the circulation blower discharge side of the coke dry fire extinguishing equipment, and compressed air was blown into the heat-resistant balloon tubes to expand the gas circulation system. Being able to block the duct,
In addition, the heat-resistant balloon tube can be inserted immediately at the occurrence of an abnormality by providing a box for both heat-resistant balloon tube storage and an automatic insertion device at two locations inside the gas circulation system duct on the outlet side of the boiler and the discharge side of the circulation blower. Further, it was concluded that the heat-resistant balloon tube can be shut off at a predetermined position by installing a stopper penetrating the gas circulation system duct, and the present invention has been reached.

That is, according to the present invention, the circulating blower is stopped while the cooling tower of the coke dry fire extinguishing equipment is filled with red hot coke, and the cyclone, the circulating blower, or the gas duct is introduced into the boiler outlet and the circulating blower discharge side. Insert a heat-resistant balloon tube into the gas duct of the gas circulation system at two locations, fill the heat-resistant balloon tube with pressurized air to shut off the primary side and the secondary side, and replace the secondary side with the atmosphere. After cyclone, circulating blower or It is a method of entering into a gas circulation system, which is characterized by entering into a gas duct.

Further, the circulating blower is stopped while the cooling tower of the coke dry fire extinguisher is filled with red hot coke,
In a circulation system breaker for entering a cyclone, a circulation blower, or a gas duct, a heat-resistant balloon tube inserted into the boiler outlet and the gas circulation system gas duct on the discharge side of the circulation blower at two points, and compressed air connected to the heat-resistant balloon tube. A gas circulation system interruption device comprising a supply pipe and stoppers that penetrate gas ducts in front of and behind the heat-resistant balloon tube inserted.

[0013]

The method of entering the gas circulation system of the present invention is to stop the circulation blower in a state where the cooling tower of the coke dry fire extinguishing system is filled with red hot coke, and to dispose at two locations in the duct at the boiler outlet and the circulation blower discharge side. The heat-resistant balloon tube is inserted into the heat-resistant balloon tube, and the gas duct is blocked by filling the heat-resistant balloon tube with pressurized air.If the atmosphere between the two heat-resistant balloon tubes is blocked, the cyclone, circulation blower and gas duct On-site inspection and repair can be carried out. The heat-resistant balloon tube used in this invention is a heat-resistant sheet that can withstand circulating gas and duct inner wall temperature of around 230 ° C, so the outer wall can withstand up to about 250 ° C, has a double structure, and the inner wall tube is flexible. Use heat resistant tube material. The inside of the duct can be shut off by charging cooling water between the heat-resistant outer wall sheet and the inner wall tube and enclosing pressurized air of about 5 kg / cm ² in the inner wall tube.

Further, the gas circulation system interruption device of the present invention is
Heat-resistant balloon tubes inserted into the boiler outlet and the gas circulation system duct on the discharge side of the circulation blower at two points, pressurized air supply pipes connected to the heat-resistant balloon tube, and stoppers that penetrate the gas ducts before and after the heat-resistant balloon tube inserted. After installing a stopper that penetrates the gas duct in front of and behind the heat-resistant balloon tube, insert the heat-resistant balloon tube into the duct, and insert pressurized air into the heat-resistant balloon tube to expand it, The tube is pressed against the inner surface of the gas duct to block it, so the blocking operation is extremely easy, and if a box for storing the heat-resistant balloon tube and for the automatic insertion device is installed at the blocking position of the gas duct, the gas duct can be opened in an extremely short time. It can be shut off and can be used immediately when an abnormality occurs.

The heat-resistant balloon tube used in the present invention is
It is necessary that the outer diameter is larger than the inner diameter of the gas duct in a state where the pressurized air is inserted and expanded, and it is suitable that the outer diameter can be expanded to about 1.2 times the inner diameter of the gas duct. Further, the gas circulation system interruption device of the present invention can be applied not only to the interruption of the gas circulation system duct of the above-mentioned coke dry fire extinguishing equipment, but also when the combustible gas and inert gas lines enter the duct. .

[0016]

【Example】

Example 1 Details of the present invention will be described below with reference to FIG. FIG. 1 shows a case where the gas circulation system breaker of the present invention is installed on the boiler outlet side and the circulation blower discharge side of a coke dry fire extinguisher, and FIG. 1 (a) is an explanatory view of the installation position of the gas circulation system breaker. , (B) is a schematic cross-sectional view showing the installation state in the duct on the outlet side of the boiler, and (c) is a schematic cross-sectional view showing the installation state in the circulation blower discharge side.

In FIG. 1, 1 is a boiler for coke dry fire extinguishing equipment, 2 is a cyclone, 3 is a circulation blower, and the inert circulating gas that has become hot due to heat exchange with red hot coke in a cooling tower of the coke dry fire extinguishing equipment , As indicated by the arrow,
After primary dust removal in the flue, it is introduced into the boiler 1 and cooled by heat exchange, and the residual dust is removed in the cyclone 2 and blown into the lower part of the cooling tower via the circulation blower 3. The gas circulation system breaker of the present invention is installed in the gas circulation system ducts on the outlet side A of the boiler 1 and the discharge side B of the circulation blower 3. When the gas circulation system ducts on the outlet side A of the boiler 1 and the discharge side B of the circulation blower 3 are shut off, the circulation blower 3 is stopped while the cooling tower is filled with red hot coke.

The gas circulation system breaker installed on the outlet side A of the boiler 1 has a stopper 6 which penetrates one end of the gas duct 4 by removing a lid of a manhole 5 provided on the gas duct 4.
After inserting 6, the heat-resistant balloon tube 7 is attached to the gas duct 4
The heat-resistant balloon tube 7 is expanded more than the inner diameter of the gas duct 4 by inserting the compressed air into the heat-resistant balloon tube 7 by opening the on-off valve 9 of the compressed air supply pipe 8 connected to the heat-resistant balloon tube 7. Then, the gas duct 4 on the outlet side of the boiler 1 is shut off. On the other hand, in the gas circulation system interruption device installed on the discharge side B of the circulation blower 3, after inserting the stoppers 11 and 12 penetrating one end of the gas duct 10, the heat-resistant balloon tube 13 is inserted into the gas duct 10 and the stopper 11 is inserted. Between the heat-resistant balloon tube 13 and the heat-resistant balloon tube 13, the on-off valve 15 of the compressed air supply pipe 14 connected to the heat-resistant balloon tube 13 is opened to press the compressed air into the heat-resistant balloon tube 13 so that the heat-resistant balloon tube 13 has a diameter smaller than that of the gas duct 10. The gas duct 10 on the discharge side of the circulation blower 3 is cut off by greatly expanding it.

Thereafter, if the atmosphere is introduced into the secondary side blocked by the heat-resistant balloon tubes 7 and 13 to purge the inert circulating gas, it is blocked by the cyclone 2, the circulation blower 3 and the heat-resistant balloon tubes 7 and 13. It is possible to enter the secondary duct. Therefore, the outlet A of the boiler 1
For shutting off the gas circulation system duct on the discharge side B of the circulation blower 3, the manhole 5 lid is removed, the heat-resistant balloon tubes 7 and 13 are inserted into the gas circulation system duct, and pressurized air is supplied to the heat-resistant balloon tube 7. This can be achieved only by inflating 13, and the working time can be greatly reduced as compared with the case of inserting a conventional closing plate. In order to ensure the safety of intruders in the secondary duct that is blocked by the cyclone 2, the circulation blower 3, and the heat-resistant balloon tubes 7 and 13, a continuous monitoring device for oxygen and carbon monoxide at the intruding point is provided. , Take safety measures.

Embodiment 2 FIG. 2 is a vertical sectional view showing a state in which a gas duct is blocked by using a heat resistant balloon tube having a double structure. In FIG.
21 is an outer wall made of a heat-resistant sheet that can withstand a maximum of 250 ° C. of a double-structured heat-resistant balloon tube, 22 is an inner wall tube,
Reference numeral 23 is a compressed air supply pipe for supplying compressed air into the inner wall tube 22, 24 is a cooling water supply pipe for supplying cooling water between the outer wall 21 and the inner wall tube 22, and 25 is a cooling water discharge pipe connected to the outer wall 21. Is. Internal inspection of the gas duct 26,
Outer wall 21 and inner wall tube 22 on both sides of the area requiring repair
The heat-resistant balloon tube 27 having a double structure is inserted by removing the lid of the manhole (not shown), and compressed air is supplied into the inner wall tube 22 through the compressed air supply pipe 23 so that the inner wall tube 22 is close to the inner diameter of the gas duct 26. When the cooling water is supplied through the cooling water supply pipe 24 between the outer wall 21 and the inner wall tube 22 while being expanded to the outer wall 21, the outer wall 21 is pressed against the inner surface of the gas duct 26 so that the gas duct 26 is connected to the primary side 28 and the secondary side. Blocked on side 29.

Therefore, the two heat-resistant balloon tubes 2 are provided.
If the atmosphere is introduced into the secondary side 29 of the gas duct 26, which is blocked by 7, 27, and the gas in the secondary side 29 is purged, it is possible to enter the secondary side 29 of the gas duct 26.
Enter the secondary side 29 of the gas duct 26, and carry out an internal inspection and repair. When the internal inspection and repair are completed, the compressed air supply pipe 23 is disconnected to remove the compressed air in the inner wall tube 22 and the cooling water is discharged from the cooling water discharge pipe 25 between the outer wall 21 and the inner wall tube 22. Since the heat-resistant balloon tubes 27, 27 contract, the normal operation can be resumed by pulling out from the gas duct 26 and attaching a manhole cover (not shown).

FIG. 3 is a conceptual diagram for explaining the method of inserting the heat-resistant balloon tube, and FIG. 4 is a conceptual diagram for explaining the method of inserting the stopper. In FIG. 3, 31 is a gas duct, 32 is a storage case for the heat-resistant balloon tube 33 provided in the bent portion of the gas duct 31, 34 is a cloth for sealing the inside of the storage case 32, and 35 is a front part inserted into the storage case 32. Is a breaking tool of the saw-toothed inner sealing cloth 34, and the breaking tool 35 can be pushed in to break the inner sealing cloth 34. Heat-resistant balloon tube 33
Is stored inside the breaking tool 35, and after breaking the inner sealing cloth 34, the breaking tool 3 is pushed by the pushing rod 36.
It is configured to be inserted into the gas duct 31 when pushed out from 5. Incidentally, 37 is a cover of the storage case 32, and 38 is a compressed air supply hose connected to the heat-resistant balloon tube 33. 39 is a stopper insertion pipe that penetrates the side of the gas duct 31, and the closing flange 4 is used during normal operation.
It is sealed at 0. Reference numeral 41 is a short tube attached to the inner surface of the gas duct 31 corresponding to the stopper insertion tube 39. If the closing flange 40 is removed and the stopper 42 is inserted from the stopper insertion tube 39, the tip of the stopper 42 is short.
It is configured to be inserted into 1 and held.

With the above construction, when the gas duct 31 is shut off, the cover 37 of the storage case 32 is removed and the breaking tool 35 is pushed in to store the storage case 32.
The inner sealing cloth 34 is crushed and the heat resistant balloon tube 33 is inserted into the gas duct 31 by the push rod 36. Next, the stopper flange 40 of the stopper insertion tube 39
After removing, and inserting the stopper 42 into the stopper insertion tube 39 to insert and hold the tip into the short tube 41, a compressed air supply tube (not shown) is connected to the compressed air supply hose 38, and the heat resistant balloon tube 33 When compressed air is supplied to and expanded, the heat-resistant balloon tube 33 is pressed against the inner surface of the gas duct 31, and the gas duct 31 is blocked.

When releasing the interruption of the gas duct 31,
If the compressed air supply pipe (not shown) connected to the compressed air supply hose 38 is removed and the compressed air is discharged from the heat resistant balloon tube 33, the interruption of the gas duct 31 is released. After that, the stopper 42 is pulled out and the stopper insertion tube 39
Attach the closing flange 40 to. Then, the compressed air supply hose 38 is pulled to take out the heat resistant balloon tube 33 from the gas duct 31, a new inner sealing cloth 34 is attached to the inner surface of the storage case 32, and the heat resistant balloon tube 33 is stored in the breaking tool 35. After fixing, storage case 3
If the second cover 37 is attached, normal operation can be resumed. According to the insertion method of the heat-resistant balloon tube 33 shown in FIG. 3, it is possible to immediately use the gas duct 31 when an abnormality occurs.

[0025]

As described above, according to the present invention,
The cyclone of the coke dry fire extinguishing system, the circulation blower, and the gas circulation system duct between the outlet side of the boiler and the discharge side of the circulation blower can be inspected and repaired safely in a short time, and the gas duct can be arbitrarily shut off. be able to.

[Brief description of drawings]

FIG. 1 shows a case where the gas circulation system breaker of the present invention is installed on the boiler outlet side and the circulation blower discharge side of a coke dry fire extinguisher, and FIG. 1 (a) is an explanation of the installation position of the gas circulation system breaker. The figure, (b) figure is a schematic sectional drawing which shows the installation state in the duct of the boiler exit side, and the (c) figure is a schematic sectional view which shows the installation state in the circulation blower discharge side.

FIG. 2 is a vertical sectional view showing a state in which a gas duct is blocked by using a double-structured heat-resistant balloon tube.

FIG. 3 is a conceptual diagram for explaining a method of inserting a heat resistant balloon tube.

FIG. 4 is a conceptual diagram for explaining a method of inserting a stopper.

FIG. 5 is a schematic system diagram of coke dry fire extinguishing equipment.

[Explanation of symbols]

 1,60 Boiler 2,61 Cyclone 3,62 Circulation blower 4,10,26,31 Gas duct 5 Manhole 6, 11, 12, 42 Stopper 7, 13, 27, 33 Heat-resistant balloon tube 8, 14, 23 Compressed air supply pipe 9, 15 On-off valve 21 Outer wall 22 Inner wall tube 24 Cooling water supply pipe 25 Cooling water discharge pipe 28 Primary side 29 Secondary side 32 Storage case 34 Inner sealing cloth 35 Breaking tool 36 Push rod 37 Cover 38 Compressed air supply hose 39 Stopper insertion pipe 40 Closing flange 41 Short pipe 51 Cooling chamber 52 Pre-chamber 53 Charging inlet 54 Red hot coke 55 Gas blowing device 56 Coke cutting device 57 Small flue 58 Circular flue 59 Flue

Claims (2)

[Claims] 1. A gas circulation system at a boiler outlet and a discharge side of a circulation blower in a method of entering into a cyclone, a circulation blower or a gas duct by stopping a circulation blower in a state where a cooling tower of a coke dry fire extinguisher is filled with red hot coke. Insert a heat-resistant balloon tube into the gas duct at two places, fill the heat-resistant balloon tube with pressurized air to shut off the primary side and the secondary side, and replace the secondary side with atmospheric air, then cyclone,
A method for entering a gas circulation system, characterized by entering a circulation blower or a gas duct. 2. A boiler outlet and a circulation blower discharge side in a circulation system interruption device for stopping a circulation blower in a state where a cooling tower of a coke dry fire extinguishing system is filled with red hot coke and entering a cyclone, a circulation blower or a gas duct. A heat-resistant balloon tube inserted into two places in the gas circulation system gas duct, pressurized air supply piping connected to the heat-resistant balloon tube, and stoppers arranged before and after the inserted heat-resistant balloon tube. Gas circulation system breaker.