JPH0662954B2 - Sealing device for coke oven - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sealing device for closing both side openings of a coke oven furnace chamber.

[Prior Art] The openings on both sides of a horizontal chamber type coke oven, which is designed to push the produced coke from one side to the other side, are closed by removable doors. The door is locked to a door frame attached to the end of the furnace chamber, and at a closed position, a sealing material provided around the door is brought into close contact with the door frame surface to seal it. Door frame is 4m high
8m to 8m, which is integrally formed to surround the opening of the furnace chamber,
Usually, it is a solid body made of cast iron, and it is pressed to the circumferential groove formed in the furnace brick in accordance with the furnace side surface with the locking metal fittings protruding from the fitting armor plate, and the middle part of both sides is It is restrained and restrained so that it does not bulge inward and narrow the opening width. 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 action of coking from the inside, and since one side is in contact with the outside air, there is a large temperature gradient, causing thermal warp deformation due to the temperature difference, and this thermal warp deformation is the cause. However, there is a problem that gas leaks from the closed portion and impairs the airtightness of the heating wall. That is, while the surface temperature inside the furnace changes from 400 ° C to 700 ° C, the outside air surface temperature in contact with the outside air is only about 100 ° C to 300 ° C, so that the upper and lower ends are curved outside the furnace. On the other hand, the side surface of the furnace body is curved in a manner opposite to that of the door frame due to the uneven thermal expansion of the respective portions of the heating wall, so that the middle portion of the furnace body expands to the outside of the furnace in most cases. In this case,
If you force the binding so that both sides of the door frame fit over the sides of the furnace body over the entire length, an excessive force may be applied to a part of the heating wall, causing damage to the heating wall or breaking the door frame. is there. For this reason, the door frame is fitted in a curved state by constraining it so as to return the thermal warp deformation within the range of the allowable bending amount, and the different gaps in each part between the side surface of the furnace body and the both sides of the door frame. Is filled with a mortar or a packing material so as to be in close contact therewith. This amount of thermal deformation fluctuates momentarily according to the temperature change in the closed area during the coking process,
It is also affected by changes in outside air conditions such as temperature and wind and rain. Due to this thermal deformation fluctuation of the door frame, since the binding force is not uniformly transmitted to each part of the furnace body, the heating wall partially loosens and impairs airtightness, the filler around the door frame impairs looseness and airtightness of the door, A gap is created between the sealing material and the sealing material, which causes a disadvantage such as impairing the sealing. The door similarly undergoes thermal warp deformation with a curvature different from that of the door frame, and the amount of deformation varies. In order to seal the sealing material of the door in accordance with the sealing surface of the curved door frame, the latest door is sealed by pressing the elastically molded sealing material of thin steel plate with many springs around the door. It is designed to do. However, even with this type of sealing method, it is impossible to maintain a sufficient sealed state by compensating for the heat fluctuations of the door frame and the door, and the weight of the entire door becomes heavy.
Adjusting the spring load of the press is complex and labor intensive. Therefore, environmental protection and improvement of the sealing method are required from the aspect of maintaining the furnace body.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-described circumstances, in which the temperature gradient of the door frame is loosened and the normal binding force is applied.
(EN) It is possible to provide a coke oven sealing device which can be fitted and fitted well to the side surface of a furnace body, has higher airtightness, and is easy to operate.

[Means for Solving the Problem] That is, according to the present invention, a door frame (4) attached to the end of the furnace chamber (1) in closing both end openings of the coke furnace furnace chamber.
Is made hollow with a sealing element of a flexible metal film (8 ') on the sealing surface, or is a separate flexible member formed in an annular shape around the opening peripheral edge on the sealing surface of the door frame (4). A metal hollow body (8) sealing element is provided, in which a pressurized fluid is injected in a closed state to inflate the sealing element and tightly abut the sealing material (32) around the door (30). The metal film (8 ') or the hollow body (8) forms a circulation passage, which is connected to a heat recovery device and is stable at a temperature of 300 to 500 ° C. A liquid heat medium having a low vapor pressure that can be used as a product is circulated under pressure to cool the door frame (4) while recovering heat so as to keep the temperature of the door frame constant throughout the coking process, and A passage is formed inside the both sides of the door frame (4) over almost the entire length. Flow channel (5) and a flow channel (6) formed by the metal film (8 ') or the hollow body (8) while circulating a fluid heated by passing through the flow channel (5). The present invention proposes a coke oven sealing device characterized by comprising:

[Operation] In the above-mentioned device of the present invention, the door frame itself is prevented from being thermally deformed, and the sealing surface is flexibly formed to be inflated by the internal fluid pressure, so that the door sealing material is always applied with a constant force. It is designed to be accessible. That is, on the sealing surface of the door frame, a flexible metal film is formed in a hollow body, or a flow path is provided over the substantially entire length inside both side edges of the door frame, and a separate body is formed on the sealing surface of the door frame. It is equipped with a flexible metallic hollow body, in which a pressurized fluid is circulated and cooled to keep the temperature difference small and to keep the temperature change small throughout the coking process. The body is inflated and pressed evenly against the sealing material around the locked door so that it seals. The fluid used may be either a gas or a fluid, but the temperature is preferably 3
It is a liquid heat transfer agent that can be used stably for a long period of time from 00 ° C to 500 ° C, and the fluid heated by passing through the flow path of the door frame is sent to a heat recovery device provided at an appropriate position in the premises, Therefore, it is cooled and pressurized under heat recovery and returned to the door frame.

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

1a, 1b, 2, 3, 4a, 4
FIG. 4b, FIG. 4c and FIG. 4d show a door frame according to the present invention. The door frame 4 is integrally formed in a size surrounding the opening at the end of the furnace chamber 1 and has a fluid passage 5 inside. And a sealing element of the flexible hollow body 8 that bulges due to the internal fluid pressure on the outer sealing surface.

Is the sealing element integrally formed with the door frame 4 as the wall side of the flow path 6 by welding the molded thin metal film 8'in an airtight manner (second
Alternatively, a molded thin metal film 8'is formed on the annular hollow body 8 surrounding the opening of the furnace chamber, which is separate from the door frame 4, so that the thin metal film 8'can be attached to the sealing surface in a replaceable manner (3rd illustration). ).
That is, as shown in FIG. 2, at least both sides are
A hollow flow path 5 is formed over the entire length thereof, and an annular groove 9 is formed on the outer side surface thereof. A molded thin metal film 8 ′ having a size to be fitted in the groove 9 is welded to form a hollow flow path. It forms a passage 6 and is sealed. The flow path 5 and the flow path 6 are communicated with each other through a plurality of holes 12 drilled in the wall side 11. The molded thin metal film 8'is formed by forming a thin heat-resistant steel plate in a convex cross section,
It is made flexible so that it bulges from 2 mm to 10 mm depending on the fluid pressure inside. The metal film 8 ′ may be a single so-called single ply, or a plurality of film materials may be stacked to protect the inner fluid blocking film material with the outer film material. Further, as shown in FIG. 3, the flow path 5 is provided inside both side edges of the door frame 4, and the outer peripheral groove 9 is formed as a separate annular member which is flexibly made of the same metal film 8 '. Hollow body 8
May be replaceably attached.

The upper and lower ends of the flow path 5 are connected and extended with conduits having flange joint ends, or the opening at the end of the flow path 5 is closed by a blind plate or a plug, and another communicating hole drilled from the outer surface is connected. The end of the hole may be used as the connection port. The flow path 6 is formed into an annular shape by welding a molded thin steel plate 7 to the side facing the door frame 4 or the opposite side thereof, and a lug plate 13 protruding around the periphery at an appropriate interval,
It is fastened with bolts 14 and attached to the door frame 4. A heat-resistant soft gasket material 10 is provided between the flow path 6 and the door frame 4.
Is provided. The metal thin film 8 ′ or the hollow body 8 forming the flow path 6 swells by the internal fluid pressure in the closed state, and is flexible enough to seal the gaps formed between the seal members 32 of the door 30 at different intervals. Any structure, shape, and attachment method may be used as long as they are provided, and the details thereof are not limited. For example, according to FIG. 4a, the gasket material 10 is held in a groove formed in the steel plate 7 made of an I-shaped profile material facing the door frame 4, and a molded metal film 8'is welded to the outside to flow. The path 6 is formed. According to FIG. 4b, the gasket material 10 is held in the circumferential groove 9 formed in the door frame, and the flow path 6 is formed on the outer side of the gasket material 10 by the steel sheet 7 made of the profile material and the molded thin metal film 8 '. There is. According to the one in Figure 4c,
The flow channel 6 is composed of a steel plate 7 made of a U-shaped material and a molded thin metal film 8 ′, and the molded thin metal film 8 ′ is a gasket material 1 having a circumferential groove 9.
It is located on the side facing 0. According to FIG. 4d, the flow path 6 is formed by welding the molded thin metal films 8'a and 8'b to the steel plate 7 made of the deformed material on the side facing the door frame 4, and the metal film for blocking the fluid inside is formed. 8'a is protected by an outer metal film 8'b. Further, the flow path 6 may be formed by a thin metal tube, and is not limited to the illustrated example. This channel 6
Has a portion projecting to a position where it does not interfere with the attachment and detachment of the door at each of the upper and lower ends, and pipes for supplying and discharging fluid are connected to the pipe joints 15a and 15b fixed here.

The door frame 4 configured as described above is fitted into the circumferential groove 1a formed so as to surround the opening on the side surface of the road chamber 1, and a plurality of key-like locking metal fittings protruding from the armor plate 3 for protecting the furnace body. 17
While being pressed against the furnace body by means of the above, it is pulled and restrained so that the middle portions of both long sides do not swell to the inside of the opening and narrow the width of the opening. The locking metal fitting 17 is fastened with a bolt 18 screwed into the armor plate 3, the force of pressing in the furnace body direction is created by the tightening force of the bolt 18, and the pulling force is the tensile strength of the locking metal fitting 17. It is supported by steel pieces 19 which are projected and welded to both sides. The key portion at the tip of the locking metal fitting 17 is hooked on the lug 16 formed integrally with the door frame 4. The length of the engaging surface of the lug 16 is such that it can be sufficiently engaged in the state where the lug 16 is thermally expanded under the temperature of use. Reference numeral 21 denotes a rack plate for locking the door 30, which is bolted and fixed to the lug 20 which projects from the door frame 4 and is integrally formed. The gap between the furnace body and the door frame 4 should be a suitable refractory material 22
It is filled with and is hermetically sealed.

The fluid communicated with the flow paths 5 and 6 may be either a gas or a liquid.
Even if it is heated to 00 ° C, it does not change in quality and can be used stably for a long time, it is not corrosive, has a low vapor pressure, and has a large heat capacity. Even if the amount of condensed tar is reduced, it is advantageous that the amount of circulating power consumption can be reduced.

In operation, the door 30 to be used is preferably provided with a sealing material 32 made of a soft packing material around the door frame 4,
A door formed with a gas channel 25 for leading out coking product gas having a large cross-sectional area extending along the entire height of the furnace chamber 1 is used. The door is bent with the sealing material 32 by the peripheral push bolts 35 substantially in accordance with the curvature of the door frame 4, and a known suitable locking device 37 is engaged with the rack plate 21 of the door frame 4 and locked. To be done.

In the closed state, the sealing element of the door frame 4 swells due to the internal fluid pressure, is in close contact with the sealing material 32 of the door, and is kept in a position where the force of free expansion is blocked. . From the heating part of coking to gas channel 25
The temperature of the high-temperature gas collected in the gas rises along the door frame 4, and part of the retained heat is transferred to the fluid inside the flow path 5 of the door frame 4 to lower the temperature, and the gas space above the furnace chamber 1 is reduced. Flow to.

Pressurized fluid is supplied from the inlets a and b at the upper end and heated at the lower end through the flow path 5 in order to increase the temperature of the sealing portion through the heated fluid through the sealing element and reduce the surface condensation of tar. Are taken from outlets c and d, part of which is piped so as to enter the channel 6 from 15b, through which it exits 15a and joins with the remainder from outlets c and d. The connection pipes of the inlets a and b and the outlets c and d are equipped with a flow rate control valve (not shown). Of course, when the hollow body 8 is provided as a separate body, it is possible to operate the flow passage 5 and the hollow body 8 through different fluids. The fluid heated inside each door frame 4 is guided to a heat recovery device (not shown), where it is cooled under heat recovery, pressurized and circulated in the door frame 4. The heat recovery device is provided at an appropriate position in the yard, and is connected to the supply and discharge manifold pipes provided along the coke oven cluster to form a closed circulation circuit. Of course it is installed separately. It is also possible to operate by using a common heat recovery device, a circulation path and a heat transfer agent in connection with a riser heat recovery facility and the like.

The surface between the sealing element of the door frame and the armor plate 3 is covered with the heat insulating material 2
6, the door seal plate 31 and the seal material 32 are mounted.
If a heat insulating material layer 36 having a size substantially covered with the heat insulating material 26 is provided on the back side of the container to reduce heat radiation to the outside, the temperature of the sealed portion is further increased, tar condensation is reduced, and heat recovery is performed. Can be operated with high efficiency.

The total amount of heat of the gas passing through the gas channel 25 gradually changes as coking progresses, and the temperature of the door frame 4 also changes according to this change, but the fluid circulation amount is changed stepwise or continuously. The temperature change of the door frame 4 can be reduced during the coking process.

[Effects of the Invention] As described above, the sealing device for a coke oven according to the present invention makes the door frame a hollow body provided with a flow path formed by a flexible metal thin film on the sealing surface, or internally. A separate flexible metal hollow body is provided on the sealing surface with a flow path, and a pressurized fluid is circulated inside the flow path or hollow body formed by a metal thin film and cooled from the inside to control the temperature. At the same time, inflate the metal thin film or hollow body, and contact the sealing material of the door,
It is designed to be sealed and has the following advantages in operation.

By cooling with the fluid circulating inside the door frame,
The temperature difference between the furnace inner surface and the furnace outer surface is significantly reduced,
In particular, the thermal warp deformation on both sides caused by this temperature difference is small, and therefore the stress of this thermal deformation constraint is small, so that the door frame is not broken or the heating wall is not damaged. Therefore, the heating wall can be easily fitted and fixed to the side surface of the furnace body, and the heating wall can be bound with a more uniform force. It has been clarified that when the above temperature difference is 100 ° C. or less, thermal warp deformation that hinders the operation does not occur, and the force applied to the locking fitting is significantly reduced.

The temperature change of the door frame is kept small throughout the coking process, and the thermal reaction deformation due to this temperature change becomes small, so that the fluctuation of the binding force of the heating wall becomes small.

Since the seal element of the door frame on the furnace body side is inflated by the internal pressure and pressed against the seal material of the door to seal it, the work of adjusting the seal of the door is no longer necessary, and the door can have a simple structure.

Even if the amount of thermal deformation of the door body fluctuates during the coking process and the size of the gap between the sealing material and the door frame fluctuates, the amount of fluctuation is within the range of the residual bulging displacement stroke amount of the sealing element. If so, the sealing element is displaced to the close contact position by the internal pressure, and a good sealed state can be always maintained.

The sealing element operated by the internal fluid pressure can obtain a constant abutting force at each part of the sealing portion around the long opening regardless of the amount of displacement stroke for the sealing gap when the pressure is kept constant. As a result, the closing force of the door can be supported and the structural material of the transmission can be constructed with the minimum bending resistance.

Along with the door frame, the heat of the produced gas that gathers and rises in the gas channel that extends to the entire height of the furnace chamber is transferred to the circulating fluid for recovery and utilization, so that the thermal efficiency of the coke furnace group increases and the hydrocarbons in the closed area By suppressing the formation of carbon due to secondary pyrolysis, it is possible to reduce pollution,
And it is possible to prevent strong heat from working on the door.

As described above, the effect of the coke oven sealing device of the present invention is great.

[Brief description of drawings]

1a and 1b are a front view and a side view of a 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. FIGS. 4a, 4b, 4c and 4d are partially enlarged cross-sectional plan views showing metal hollow bodies according to different embodiments of the present invention. In the drawings, 1 ... Furnace chamber 2 ... Heating chamber 3 ... Armor plate 4 ... Door frame 5, 6 ... Flow path 8 ... Hollow body 8 '... Molded thin metal film 10 ... Gasket material 13 ... Fixed lug 17 ... Locking metal fitting 21 ... Rack plate 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 device 15a, 15b, a , B, c, d ... Connection ports.

Claims (1)

[Claims] 1. A coke oven in which both end openings of a furnace chamber are closed, a door frame (4) attached to the end of the furnace chamber (1) has a hollow shape having a sealing element of a flexible metal film (8 ') on a sealing surface. Alternatively, the sealing surface of the door frame (4) is provided with a separate sealing element of a flexible metal hollow body (8) formed in an annular shape so as to surround the peripheral edge of the opening, and is added in a closed state. Inject pressurized fluid to inflate this sealing element and allow the door (30)
The surrounding sealing material (32) is closely contacted and hermetically sealed, and at this time, a circulation channel is formed by the metal film (8 ') or the hollow body (8), and this circulation channel recovers heat. A liquid heat medium with low vapor pressure that is connected to a vessel and can be used stably at a temperature of 300 ° C to 500 ° C is circulated under pressure, the door frame (4) is cooled while heat is recovered, and the door is opened throughout the coking process. A flow path (5) for keeping the frame at a constant temperature, and the circulation flow path formed over substantially the entire length inside both vertical sides of the door frame (4), and this flow path (5) And a flow path (6) formed by the metal film (8 ') or the hollow body (8) for circulating a heated fluid therethrough and sealing the coke oven. apparatus.