JP2012184379A - Sealing structure and sealing method of furnace cover in coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve sealing property of a furnace cover part by a simple low-cost means when the carbonization chamber of a coke oven is made empty.SOLUTION: A first heat insulating material 11 is disposed between a furnace cover refractory 8 inserted into the opening of the carbonization chamber 2 and a furnace cover frame 3 fixed around the opening of the carbonization chamber 2, and a second heat insulating material 12 is disposed at the joint of a knife edge 9 attached to a furnace cover body 4 and the furnace cover frame, whereby the sealing property of the coke oven can be improved by a short-term simple operation.

Description

  TECHNICAL FIELD The present invention relates to a coke oven for producing coke by dry distillation of coal, and more particularly to a sealing structure and a sealing method for a carbonization chamber furnace lid in a coke oven in an empty kiln state.

  Since the coke oven generates coke oven gas in the process of carbonizing coal in the carbonization chamber, it is necessary to shut off the outside air for recovery during the carbonization. On the other hand, in order to discharge the produced coke from the furnace, the carbonization chamber must be opened, and thus a furnace lid is installed at the opening of the carbonization chamber.

  Since many steel structures (metals) are used for this furnace lid part, the accessory hardware such as the frame of the furnace lid body and the furnace lid frame provided on the coke oven body side is heated and heated from the inside of the furnace. Therefore, there arises a problem that a sufficient seal is not secured and the gas inside the furnace is not sufficiently sealed.

  In order to solve such a problem, as disclosed in Patent Document 1, a seal plate is provided on the entire periphery of the furnace lid, and this seal plate is attached to the furnace main body by a knife edge biased by a spring force. A method is adopted in which the furnace body is sealed by pressing against the furnace lid frame.

Further, as a method for further improving the sealing performance, an air inlet is provided in a furnace lid frame attached to the furnace body with a double knife edge as disclosed in Patent Document 2, and an air inlet is provided. There is a method of preventing the outflow of gas in the furnace to the outside of the furnace by providing an air outlet in the furnace lid frame on the opposite side.
This method of double sealing is advantageous in terms of performance, but the structure becomes complicated, such as the need for an air inlet / outlet, and there is a problem such as cost in remodeling existing equipment, and there is still a patent. There is also a coke oven with a single seal structure as shown in Document 1.

  However, in the normal continuous operation, even a single sealing device as described above is not a big problem, but in recent years, there are cases where the operation is not continuously performed due to fluctuations in economic conditions and the like. In particular, in banking in which the coke oven is temporarily suspended and the furnace is in an empty kiln state, if the furnace lid sealability is poor, the accessory attached to the furnace lid and the furnace lid frame can be heated and deform. is there. Moreover, since the temperature in the furnace is released to the outside through the accessory, there is a problem that the temperature of the carbonization chamber cannot be kept constant.

  Therefore, in order to cope with such a problem, it is required to improve the sealing performance of the furnace lid portion, particularly when the coking chamber of the coke oven is in an empty kiln state.

Japanese Patent Laid-Open No. 2-14285 JP 7-258646 A

Although a double seal structure as described in Patent Document 2 is effective as a means for improving the sealing performance, it is difficult to remodel such a structure in a short time, and the coke oven is operated for one week or more. The banking operation, which was suspended for several months, was not suitable for both time and money.
Therefore, there is a demand for a furnace lid seal structure that can be installed on the furnace lid with a simple structure and a short construction time.

  In this invention, the heat-resistant blanket was affixed between the furnace lid refractory material inserted in the inlet part (kiln opening part) of a carbonization chamber opening part, and a furnace accessory. In addition, by sticking a heat insulating seal between the knife edge part of the furnace lid on the furnace frame sheet surface and the furnace accessory, gas leakage from the inside of the furnace was prevented, and the temperature increase of the accessory was also suppressed.

(1) In the seal structure of the furnace lid attached to the opening of the coking chamber of the coke oven,
A first heat insulating material is disposed between a furnace lid refractory provided in the furnace lid body and inserted into the carbonization chamber opening, and a furnace lid frame fixed around the opening of the carbonization chamber, and further the furnace A furnace lid sealing structure, wherein a second heat insulating material is disposed at a contact portion between a knife edge provided on a lid body and the furnace lid frame.
(2) The furnace lid sealing structure according to (1), wherein the first heat insulating material is a heat-resistant bracket having a thickness of 10 mm to 50 mm.
(3) The furnace lid sealing structure according to (1), wherein the second heat insulating material is a heat-resistant tape having a thickness of 1 mm to 5 mm.
(4) In the method of sealing the furnace lid attached to the opening of the coking chamber of the coke oven,
When the coke oven is in an empty kiln state, a furnace lid refractory which is provided in the furnace lid body and is inserted into the carbonization chamber opening, and a furnace lid frame fixed around the opening of the carbonization chamber. A method of sealing a furnace lid in a coke oven, characterized in that a single heat insulating material is disposed, and a second heat insulating material is disposed at a contact portion between a knife edge provided on the furnace lid body and the furnace lid frame. .

When the coking oven's coking chamber is in an empty kiln state, such measures are taken by installing a heat-insulating blanket at the coking chamber entrance (kiln entrance) and attaching a heat-insulating seal to the furnace frame seal surface. It is possible to manage the hardware attached to the furnace lid portion at a low temperature, and to suppress the deformation of the hardware and the dissipation of heat through the hardware, compared to when no countermeasures are taken.
The construction time for affixing the heat insulating material twice is about 15 minutes per furnace lid, enabling construction in a short time.

It is sectional drawing of the horizontal direction of the furnace cover in the coke oven concerning one Embodiment of this invention. It is a figure which shows the temperature course of the furnace cover main body at the time of banking of a coke oven.

  The furnace lid of the coke oven is generally sealed by bringing a furnace lid frame installed at the carbonization chamber inlet (kiln entrance) into contact with knife edges provided on both sides of the furnace lid. FIG. 1 shows an example in which the seal structure of the present invention is applied to such a conventional furnace lid structure.

  FIG. 1 is a cross-sectional view showing a furnace port of a coke oven, and a furnace lid body 4 having a shape for closing the furnace mouth is fixed to a furnace lid frame 3 fixed to the furnace mouth of each carbonization chamber 2 of the coke oven body 1. The furnace lid is fixed. In front of the carbonization chamber 2, a furnace cover holder 5 extending from the furnace cover frame 3 is erected, and a pair of upper and lower furnace cover holders 6 are arranged to engage with the furnace cover body 4. 6 is configured to be constantly pressed to the coke oven side by a spring device 7 inserted between the furnace lid body 4 and the furnace lid refractory 8 attached to the inside of the furnace lid body 4 is carbonized. It is inserted into the room to insulate the furnace lid.

  Further, a knife edge 9 is provided on the outer peripheral surface facing the coke oven side with the furnace lid body 4, and by urging the knife edge 9 toward the furnace lid frame 5 by the spring plunger 10, The space between the furnace lid body 4 and the furnace lid frame 3 provided at the furnace port on the coke oven side is sealed.

  In order to further improve the sealing performance with respect to such a sealing structure, in the present invention, a heat insulating seal 10 serving as a first heat insulating material is attached to a portion where the knife edge 9 is in contact with the furnace cover frame 3. Thus, air entry into the furnace is prevented by sticking a kiln opening heat insulating material 11 as a second heat insulating material between the furnace cover frame 3 and the furnace cover refractory 8 while preventing air from entering the furnace. At the same time, the radiant heat from the furnace is shut off.

A flexible refractory material is used for both the first and second heat insulating materials.
As the heat insulating seal 10, for example, a heat insulating tape such as a glass cloth ribbon tape is used, and an adhesive tape is applied to one or both surfaces of the heat insulating tape, and an adhesive is applied to the surface of the furnace cover frame 3 in contact with the knife edge as shown in FIG. The inside of the furnace was kept hermetically sealed by using. The thickness of the heat insulating seal is preferably about 1 to 5 mm, and more preferably about 3 mm.

  Moreover, as the kiln opening heat insulating material 11, a blanket such as a fire-resistant kao wool blanket is used, and the blanket (kiln opening heat insulating material 11) is a surface on the kiln opening side of the furnace lid frame 3 as shown in FIG. Use an adhesive to attach. The thickness of the blanket to be used is preferably about 10 to 50 mm, more preferably 20 to 30 mm.

  In the present invention, a simple structure in which the heat insulating material is affixed twice around the kiln opening is employed. Therefore, when temporarily setting an empty kiln, the construction time required for adhering the heat insulating material is one furnace. It takes about 15 minutes per lid, enabling construction in a short time.

In addition, this invention is not limited to the furnace lid of the sealing structure demonstrated above, It is possible to apply widely to the furnace lid which has a seal structure of the type which presses a knife edge to a furnace lid frame.
The present invention is widely applied not only when adjusting the amount of coke produced, but also when the coking chamber is temporarily set to an empty kiln during a large-scale repair of a coke oven or ancillary equipment. Is possible.

After using a glass cloth ribbon tape having a thickness of 3 mm as the heat insulation seal 11 and using a 30 mm thick kao wool blanket as the heat insulating material 12 for the kiln, each is attached to the furnace lid frame of the coke oven carbonization chamber as shown in FIG. , Conducted banking.
At that time, the temperature of the furnace lid main body was measured at three locations, an upper portion, a middle portion and a lower portion. FIG. 2 shows the temperature change during banking. Moreover, in the past, the measured values obtained when banking was carried out without taking measures against heat insulation are shown together in FIG.

As shown in FIG. 2, by applying the heat insulation measures of the present invention, it was possible to manage the furnace cover-attached hardware at a lower temperature than when no measures were taken.
When the kiln opening heat insulating material and the heat insulation seal were not installed, the surface temperature of the furnace frame 11 was as high as about 300 ° C., but when the present invention was carried out, it was 200 ° C. or less and about 100 ° C. The temperature could be lowered.

  Normally, when the temperature of the furnace lid rises, the furnace lid is deformed and the sealing performance is lowered, and the air that has entered from the outside air is burned, resulting in a high temperature, so that the deformation of the furnace lid increases and further air enters. However, it was confirmed that the present invention can improve the sealing performance of the furnace lid, suppress the deformation accompanying the temperature rise of the furnace lid, and prevent the intrusion of air.

  The present invention can improve the sealing performance in a short time and at a low cost when the coke oven is temporarily put into an empty kiln state, such as when adjusting the production amount of coke. high.

DESCRIPTION OF SYMBOLS 1 Coke oven main body 2 Coking chamber 3 Furnace lid frame 4 Furnace lid main body 5 Furnace lid holder 6 Furnace bowl 7 Spring device 8 Furnace lid refractory 9 Knife edge 10 Spring plunger 11 Thermal insulation seal (first thermal insulation)
12 Kiln entrance insulation (second insulation)

Claims (4)

In the seal structure of the furnace lid attached to the opening of the carbonization chamber of the coke oven,
A first heat insulating material is disposed between a furnace lid refractory provided in the furnace lid body and inserted into the carbonization chamber opening, and a furnace lid frame fixed around the opening of the carbonization chamber, and further the furnace A furnace lid sealing structure, wherein a second heat insulating material is disposed at a contact portion between a knife edge provided on a lid body and the furnace lid frame.   2. The furnace lid sealing structure according to claim 1, wherein the first heat insulating material is a heat-resistant bracket having a thickness of 10 mm to 50 mm.   2. The furnace lid sealing structure according to claim 1, wherein the second heat insulating material is a heat-resistant tape having a thickness of 1 mm to 5 mm. In the method of sealing the furnace lid attached to the opening of the carbonization chamber of the coke oven,
When the coke oven is in an empty kiln state, a furnace lid refractory which is provided in the furnace lid body and is inserted into the carbonization chamber opening, and a furnace lid frame fixed around the opening of the carbonization chamber. A method of sealing a furnace lid in a coke oven, characterized in that a single heat insulating material is disposed, and a second heat insulating material is disposed at a contact portion between a knife edge provided on the furnace lid body and the furnace lid frame. .

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