JPS62124185A - Sealing device for coke oven - Google Patents

Abstract

PURPOSE:The titled readily handleable device having high airtightness, wherein a sealing element of a hollow, flexible, metallic film is set at a sealing face at a door of a coking chamber end of coke oven, a pressurized fluid is introduced into the element to expand the sealing element and the element is closely brought into contact with the circumference of the door. CONSTITUTION:In closing a lid of both end opening of a coking chamber of coke oven, a door frame 4 to be attached to an end of a coking chamber 1 is a hollow frame having a sealing element of a flexible metallic film 8' at a sealing face or is provided with a separate flexible metallic hollow material 8 made circularly to surround an opening peripheral edge at the sealing face of the door frame 4. A pressurized fluid is introduced into a channel 5 set along the whole length inside both vertical sides of the door frame 4 in a closed state, the sealing element is expanded and closely brought into contact with a sealing material 32 at the circumference of a door 30 to seal the coke oven in high airtightness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sealing device for closing both side openings of a coke oven chamber.

[Prior Art and Problems] The openings on both sides of a horizontal chamber coke oven, in which co-produced coke is pushed from one side and discharged from the other, are closed by removable doors. This door is latched to a door frame attached to the end of the furnace chamber, and in the closed position, a sealing material provided around the door is tightly abutted against the door frame surface for sealing. The door frame is integrally formed to a size that surrounds the i-opening of the furnace chamber with a height of 4 to 8 m.
It is usually a solid body made of cast iron, and is fitted into the circumferential groove formed in the furnace brick by pressing it against the side of the furnace body using a locking metal fitting protruding from the armor plate. To prevent the opening width from narrowing due to deformation that overhangs the side,
He is restrained and held in place.

This door frame not only locks the door, but also protects the furnace body by transmitting the force from the armor plate to the heating wall and binding it.

The door frame is affected by the strong thermal effect of coking from the inside, and because one side is in contact with the outside air, there is a large temperature gradient, which causes thermal warping due to the temperature difference, and this thermal warping deformation is the cause. However, there are problems such as gas leakage from the closed part and loss of airtightness of the heating wall. That is, while the surface temperature inside the furnace is 400 to 700°C, the surface temperature of the outside air in contact with the outside air does not remain at about 100 to 300°C, so the upper and lower ends are thermally expanded in a manner that curves toward the outside of the furnace. On the other hand, due to uneven thermal expansion of each part of the heating wall, the middle part of the side of the furnace body usually protrudes outside the furnace and is curved in the opposite manner to the door frame. In this case, if you forcibly restrain both sides of the door frame so that they are aligned with the side of the furnace body, excessive force will be applied to a part of the heating wall, causing damage to the heating wall or breaking the door frame. Sometimes. For this purpose, the door frame is fitted in a curved state, with the door frame restrained to return the heat warp within the allowable bending amount, and the gaps between each part between the side of the furnace body and both sides of the door frame are different. are filled with mortar or backing material to ensure a tight fit. The amount of thermal deformation fluctuates from moment to moment in response to temperature changes in the closed area during the coking process, and is also affected by changes in outside air conditions such as temperature and wind and rain. Due to this variation in thermal deformation of the door frame, the binding force is not uniformly transmitted to each part of the furnace body, causing the heating wall to partially loosen, impairing the airtightness, and the filling material around the door frame loosening, impairing the airtightness. This causes inconveniences such as a gap forming between the two and impairing the seal. The door is also thermally warped and deformed to a different curvature than the door frame, and the amount of deformation varies. In order to seal the door seal by matching it to the sealing surface of the curved door frame, the latest doors are made by pressing the seal material, which is elastically formed from a thin steel plate, with a large number of springs around the door. It is made to be. However, even with this type of sealing method, it is not possible to compensate for mutual thermal fluctuations between the door frame and the door and maintain a sufficient sealing state.
The weight of the entire door increases, and adjustment of the spring load for pressing is complicated and requires a lot of effort. Improvements in sealing methods are required from the standpoint of environmental protection and furnace maintenance.

[Purpose of the Invention] This invention was made in view of the above-mentioned circumstances, and its purpose is to reduce the temperature gradient of the door frame so that it fits well with the side surface of the furnace body using a normal restraining force. To provide a coke oven sealing device that can be fitted into a coke oven, has even higher airtightness, and is easier to operate.

[Means to solve the problem] The purpose of this is to prevent thermal deformation of the door frame itself, and to form a flexible sealing surface that can be inflated by the internal fluid pressure and always come into contact with the door sealing material with a constant force. This is achieved by making That is, a flexible metal film is formed into a hollow body on the sealing surface of the door frame, or
A flow path is provided inside both sides of the door frame for almost the entire length, and a separate flexible metal hollow body is provided on the sealing surface of the door frame, and the pressurized fluid is circulated inside to cool and reduce the temperature difference. In addition to maintaining a small temperature change throughout the coking process, the metal film or hollow body on the sealing surface is inflated and evenly pressed against the sealing material around the locked door to seal it. It is characterized by the fact that The fluid used may be any gas or liquid, but preferably a liquid heat transfer agent that can be used stably for a long time at a temperature of 300 to 500°C, and a fluid that is heated by passing through the flow path of the door frame. is sent to a heat recovery device installed at an appropriate location within the premises, where it is cooled and pressurized while recovering heat and returned to the door frame.

[Example 1] A coke oven sealing device of the present invention will be described below with reference to the accompanying drawings.

Figure 1a, Figure 1b, Figure 2, Figure 3, Figure 4a, Figure 4
Figures b, 4c, and 4d show the door frame according to the present invention, and the door frame 4 is integrally formed to a size that surrounds the opening at one end of the furnace chamber, and has a fluid flow path 5 inside. In addition, the outer sealing surface is provided with a flexible hollow body 8 sealing element that expands due to internal fluid pressure.

The sealing element is made by welding a molded thin metal film 8' airtightly to the flow path 6.
As a wall side, it may be formed integrally with the door frame 4 (as shown in the second figure), or a molded thin metal film 8' may be formed in the annular hollow body 8 surrounding the furnace chamber opening, which is separate from the door frame 4. It is configured such that it can be attached to the sealing surface in a replaceable manner (as shown in the third figure). That is, as shown in FIG. 2, at least both sides are formed into a hollow channel 5 over the entire length, an annular groove 9 is formed on the outer surface, and a molded thin metal film of a size that covers the groove 9 is formed. 8' is welded to form a hollow channel 6, which is sealed. The flow path 5 and the flow path 6 are communicated with each other through a plurality of holes 12 bored in the wall side 11. Molded thin metal film 8
' is made of a thin heat-resistant steel plate formed into a convex cross section, and is made flexible so that it can expand by 2 to 10 mm due to internal fluid pressure.

This metal film 8' may be a single sheet, ie, a so-called single ply, or a plurality of film materials may be stacked so that the outer film material protects the inner fluid-blocking film material. In addition, as shown in FIG. 3, a flow path 5 is provided inside both sides of the door frame 4, and a separate annular shape made of a similar metal film 8' flexibly is provided in the outer circumferential groove 9. It may also be constructed by attaching the hollow body 8 in a replaceable manner.

The upper and lower ends of the flow path 5 are connected and extended by conduits having flanged ends. Alternatively, the opening at the end of the flow path 5 may be closed with a blind plate or a plug, and the end of another communicating hole bored from the outer surface may be used as the connection port. The flow path 6 is formed into an annular shape by welding a formed thin steel plate 7 to the side facing the door frame 4 or the opposite side thereof, and lug plates 13 protruding from the periphery at appropriate intervals are fastened with bolts 14 to form the door frame. 4'. Also,
A heat-resistant soft gasket material 1 is placed between the flow path 6 and the door frame 4.
0 is set. The metal thin film 8' or the hollow body 8 forming this flow path 6 can seal gaps of different intervals formed between the sealing materials 32 of the inflatable door 30 by the internal fluid pressure in the closed state. As long as it is flexible, its structure, shape, and attachment may be of any kind, and its details are not critical. For example, according to FIG. 4a, a gasket material is placed in a groove formed facing the door frame 4 of a steel plate 7 made of a deformed material.
0 is maintained, and a molded metal membrane 8' is welded to the outside to form a flow path 6.
is formed. In FIG. 4b, a gasket material 10 is held in a circumferential groove 9 formed in the door frame, and a flow path 6 is formed on the outside by a steel plate 7 made of a deformed material and a molded thin metal film 8'.
is formed.

According to the one in FIG. 4c, the flow path 6 is composed of a steel plate 7 made of U-shaped material and a molded thin metal film 8', and the molded thin metal film 8' is arranged on the side of the circumferential groove 9 facing the gasket material 10. has been done. According to FIG. 4d, a flow path 6 is formed by welding molded thin metal films 8'a and 8'b to the steel plate 7 made of a profiled material on the side facing the door frame 4, and the inner fluid-blocking metal film 8'a is protected by an outer metal film 8'b. Further, the flow path 6 may be formed of a thin metal tube, and is not limited to the illustrated example. This flow path 6 has a portion at each of the upper and lower ends that protrudes to a position that does not interfere with attachment and detachment of the door, and fluid supply and discharge tubes are connected to pipe joints 15a and 15b fixed thereto.

The door frame 4 configured as described above is fitted into the circumferential groove 1a formed around the opening on the side of the furnace chamber 1, and is fitted into a plurality of cut-shaped locks protruding from the armor plate 3 for protecting the furnace body. Metal fittings 17
While pressing against the furnace body, the middle portions of the long sides are pulled and restrained so that they do not extend into the inside of the opening and narrow the opening width. This locking metal fitting 17 is fastened with a bolt 18 screwed into the armor plate 3, and the pressing force toward the furnace body is created by the tightening force of this bolt 18, and the pulling force is created by the force of the locking metal fitting 17. It is supported by steel pieces 19 which are protruding and welded on both sides. A cut-off portion at the tip of the locking fitting 17 is hung on a lug 16 that is integrally formed with the door frame 4. The length of the engaging surface of the lug 16 is set to a length that allows sufficient engagement in the thermally expanded state at the operating temperature. Reference numeral 21 denotes a rack plate for locking the door 30, and is bolted and fixed to the lug 20 which is integrally formed and protrudes from the door frame 4. The gap between the furnace body and the door frame 4 is filled with a suitable refractory material 22 and hermetically sealed.

The fluid flowing through the channels 5 and 6 may be any gas or liquid, but preferably at a temperature of 300 to 500 ml.
If you use a liquid heat transfer agent that can be used stably for a long time without any change in quality even when heated to Even with less tar condensation, it is advantageous to be able to operate with less circulating power consumption.

In operation, the door 30 is preferably provided with a seal 32 of a soft backing material around the periphery of the door frame 4.
A door is used which is formed with a gas channel 25 for coking product gas outlet having a large cross-sectional area and extending along the entire height of the furnace chamber 1. The door is locked by bending the sealing material 32 by surrounding push bolts 35 to approximately match the curvature of the door frame 4, and by engaging a known suitable locking device 37 with the rack plate 21 of the door frame 4.

In the closed state, the sealing element of the door frame 4 is inflated by the internal fluid pressure and held in close contact with the door seal 32 in a position of force balance where its free expansion is prevented. The high-temperature gas collected in the gas channel 25 from the heating part of the coking process transfers a part of its retained heat to the fluid inside the flow path 5 of the door frame 4 while rising along the door frame 4, and its temperature decreases. It flows into the gas space above the furnace chamber 1.

The pressurized fluid is supplied from the inlets a and b at the upper end and passes through the channel 5 to the heated lower end in order to increase the temperature of the seal and reduce the surface condensation of tar through the heated fluid in the sealing element. A portion thereof enters the channel 6 from 15b, passes through it, exits from 15a, and is connected by a tube to join the remainder from the outlets C and d. Connecting pipes for each inlet a, b and outlet c, d.

A flow control valve (not shown) is provided.

Of course, if separate hollow bodies 8 are provided, different fluids can be passed through the flow path 5 and the hollow body 8 for operation. The fluid passed through the inside of each door frame 4 and heated is
It is led to a heat recovery device (not shown), where it is cooled while recovering heat, and is circulated to the door frame 4 under pressure. The heat recovery device is installed at a suitable location within the premises and connected to the supply and outlet manifold pipes provided along the coke oven bank to form a closed circulation circuit. Of course, it is set up separately.
For example, it may be operated in conjunction with a riser heat recovery facility or the like using a common heat recovery device, circuit, and heat transfer agent.

Insulating material 2 covers the surface between the sealing element of the door frame and the armor plate 3
6, and the door seal plate 31 and sealing material 32
By providing a layer of insulating material 36 behind the insulating material 26 with a size that almost covers this insulating material 26 to reduce heat dissipation to the outside, the temperature of the sealed part will further increase, tar condensation will be reduced, and the efficiency of heat recovery will be improved. Good and can be operated.

The total amount of heat held by the gas passing through the gas channel 25 gradually changes as coking progresses, and the temperature of the door frame 4 changes accordingly, but if the amount of fluid circulation is adjusted stepwise or continuously. , temperature changes in the door frame 4 during the coking process can be reduced.

[Operations and Effects] As described above, the coke oven sealing device of the present invention has a door frame formed into a hollow body with a flow path formed by a flexible thin metal film on the sealing surface, or a door frame with a flow path formed inside the sealing surface by a flexible metal thin film. The passage is provided with a separate flexible metal hollow body on the sealing surface, and pressurized fluid is circulated inside the passage or hollow body formed by a thin metal film to cool it from the inside and control the temperature. This is made by inflating a metal thin film or a hollow body to abut the sealing material of the door and sealing it, and has the following operational advantages.

By cooling with fluid circulating inside the door frame,
The temperature difference between the inner surface of the furnace and the outer surface of the furnace becomes significantly smaller.
In particular, the thermal warping deformation on both sides caused by this temperature difference is slight, and therefore the stress of restraining this thermal deformation is small, so there is no possibility of breaking the door frame or damaging the heating wall. In addition to being able to fit and fix the heating wall well to the side surface of the furnace body, it is possible to tighten the heating wall with a more even force. It has been revealed that when the above-mentioned temperature difference is 100° C. or less, thermal warping that would cause problems in operation does not occur, and the force applied to the locking metal fittings is also significantly reduced.

Throughout the coking process, temperature changes in the door frame are kept small, and thermal warpage fluctuations due to these temperature changes are small, resulting in small fluctuations in the binding force of the heating wall.

The sealing element on the door frame on the furnace body side is inflated by internal pressure and pressed against the door sealing material to create a seal, eliminating the need to adjust the sealing of the door and simplifying the structure of the door. be able to.

In addition, even if the amount of thermal deformation of the door body changes during the coking process and the size of the gap between the sealing material and the door frame changes, the amount of change will be within the range of the remaining extension displacement stroke of the sealing element. If so, the sealing element is displaced to a close contact position by the internal pressure, and a good sealing state can be maintained at all times.

A sealing element operated by internal fluid pressure obtains a constant contact force at each part of the sealing part around a long opening, regardless of the amount of displacement stroke for the sealing gap when the pressure is kept constant. This allows the door's closing force support and transmission structure to be constructed with minimal bending resistance.

The heat retained in the product gas that collects and rises in the gas channels that extend along the door frame and the full height of the furnace chamber is transferred to the circulating fluid for recovery and utilization, increasing the thermal efficiency of the coke oven group and reducing the amount of hydrocarbons in the closed area. By suppressing the formation of carbon due to secondary pyrolysis, contamination can be reduced and intense heat can be prevented from acting on the door.

As described above, the effects of the coke oven sealing device of the present invention are significant.

[Brief explanation of drawings]

1a and 1b are a front view and a side view of the door frame, FIG. 2 is a partial cross-sectional plan view showing one embodiment of the present invention, and FIG. 3 is a cross-sectional plan view showing another embodiment of the present invention. , FIG. 4a, FIG. 4b, FIG. 4c, and FIG. 4d are partially enlarged cross-sectional plan views showing metal hollow bodies in different embodiments of the present invention. In the drawings, 1 Furnace chamber 2 Heating chamber 3 Armor plate 4 Door frame 5.6 Channel 8 Hollow body 8' Molded thin metal film 10 Gasket material 13 Fixed lug 17 Locking fitting 21 Rack removal 25 Gas channel 26 Door frame surface Heat insulating material 30 Door 31 Seal plate 32 Soft sealing material 33 Heat insulating material 34 Door body 35 Push bolt 37 Locking devices 15a, 15b, a', b, c, d Connection ports.

Claims (1)

[Claims] 1. In closing the openings at both ends of the coke oven oven chamber, the oven chamber (
1) The door frame (4) attached to the end is hollow with a sealing element of a flexible metal film (8') on the sealing surface, or the sealing surface of the door frame (4) has an opening periphery. The sealing element is a separate flexible metal hollow body (8) formed in an annular shape surrounding the door (30), and in the closed state, pressurized fluid is injected to inflate this sealing element to seal around the door (30). A sealing device for a coke oven, characterized in that the sealing device is configured to tightly contact and seal the sealing material (32) of the coke oven. 2. A circulation channel is formed by the metal film (8') or the hollow body (8), and this circulation channel is connected to a heat recovery device;
A liquid heat medium with a low steam pressure that can be stably used at a temperature of 300 to 500°C is circulated under pressure, and the door frame (4) is cooled while recovering the heat, thereby keeping the door frame at a constant temperature throughout the coking process. 2. The coke oven sealing device according to claim 1, wherein the coke oven sealing device is adapted to maintain the temperature of the coke oven. 3. The circulation flow path includes a flow path (5) formed over almost the entire length inside both vertical sides of the door frame (4), and a heated fluid passing through this flow path (5). A coke oven according to claim 1, characterized in that the coke oven comprises a flow path (6) formed by the metal membrane (8') or the hollow body (8). Sealing device.