JP4846274B2 - Insulation box used for hot repair of coke oven carbonization chamber - Google Patents

Description

  The present invention protects workers when performing hot repair of a coking chamber in a coke oven, enables repair work in a high-temperature coking chamber, and maintains a constant temperature in the coking chamber excluding the worker's work area. It is related with the heat insulation box which can maintain to prevent the mineral change of the refractory.

FIG. 2 is a horizontal sectional view schematically showing an example of the arrangement of the carbonizing chamber and the combustion chamber of the coke oven. In FIG. 2, only the vicinity of one end (that is, the left side) is shown, and the vicinity of the other end (that is, the right side) is not shown.
In the coke oven, as shown in FIG. 2, combustion chambers 1 in which fuel burns and carbonization chambers 2 in which coal is charged are alternately arranged. Coal charged into the carbonization chamber 2 is dry-distilled by heat generated in the combustion chamber 1 and becomes coke. The combustion chamber 1 is composed of wall bricks 3a and pillar bricks 3b. A kiln fitting 4 is attached to the end of the combustion chamber 1 to prevent the wall bricks 3a from protruding.

  When the coke oven is operated for a long period of time, cracks occur in the wall surface composed of the wall bricks 3a. If the operation is further continued, cracks penetrate from the combustion chamber 1 to the carbonization chamber 2, and fine coal powder floating in the carbonization chamber 2 and CO gas generated by dry distillation flow into the combustion chamber 1. Coal powder and CO gas disturb the mixing ratio of fuel and air in the combustion chamber 1 (so-called air-fuel ratio), so that a large amount of soot is generated.

Therefore, when a crack in the wall surface separating the carbonizing chamber 2 and the combustion chamber 1 occurs, it is necessary to repair the corresponding portion by brick replacement or the like. At that time, since no worker can enter the combustion chamber 1, repair is performed from the carbonization chamber 2 side. Moreover, the repair is performed at a high temperature without cooling the inside of the carbonizing chamber 2 as called hot repair. The main reason is
(1) Not only does it take a long time to cool the carbonization chamber 2 to room temperature, but it also takes a long time to raise the temperature after the repair is completed.
(2) This is because the operation of the coke oven will be hindered due to deformation of the wall surface and mineral change of the refractory (ie, wall brick, joint material) due to the temperature change in the carbonization chamber 2.

Therefore, various techniques have been studied in order to protect workers performing repair work in the carbonization chamber 2.
For example, Patent Document 1 discloses a heat insulating box that protects workers who perform repair work in a carbonization chamber. In this technique, a heat insulation box formed into a rectangular parallelepiped using a heat insulation board is inserted into a carbonization chamber, and a worker performs repair work in the heat insulation box, so that the worker is protected from heat in the carbonization chamber. However, since the heat insulation box is cooled using cooling water, a water vapor explosion may cause a steam explosion.

Patent Document 2 discloses a box-shaped repair device in which a steel outer plate is formed into a rectangular parallelepiped and a heat insulating material is attached to the inside of the outer plate. In this technique, cool air is blown from the lower part of the box. However, in this method, the lower part of the box cannot be repaired, and the function of arbitrarily repairing a necessary part is not satisfied.
JP-A-8-81681 JP-A-5-239463

  The present invention has been made to solve the above-mentioned problems, and it is possible to safely perform repair work in the carbonization chamber by protecting a worker without using cooling water, An object of the present invention is to provide a heat insulation box that can keep the temperature in the carbonization chamber excluding the region constant and prevent mineral changes in the refractory.

The present invention is a box-shaped heat insulation box inserted into a coking chamber of a coke oven, the upper surface facing the ceiling surface of the carbonizing chamber, the lower surface facing the floor surface of the carbonizing chamber, and the wall surface of the carbonizing chamber that is not repaired A wide side surface facing the wall, a narrow side surface facing the wall surface that requires repair of the carbonization chamber, and a lateral surface facing the end wall surface of the carbonization chamber are made of aggregate, and the upper surface, wide side surface, narrow side surface and lateral surface Insulate the gap between aggregates, cover the surface of the insulation with a heat-resistant stainless steel mesh, and sew a heat-resistant stainless steel wire to the insulation to fix the insulation to the aggregate. It is a heat insulation box that uses steel pipes and distributes cooling air through the steel pipes .

  According to the present invention, when performing hot repair of the carbonization chamber wall surface, it is possible to protect the worker without using cooling water and to perform the repair work in the carbonization chamber safely, and the work area of the worker It is possible to keep the temperature inside the carbonization chamber except for refractory and prevent mineral changes in the refractory.

  FIG. 1 is a perspective view schematically showing an example of the structure of the aggregate forming the heat insulation box of the present invention. The heat insulation box has a relatively wide side surface (hereinafter referred to as a wide side surface) composed of aggregates 6A to 6D and a relatively narrow side surface (hereinafter referred to as a narrow side surface) composed of aggregates 6R and 6S. The parts where the aggregates 6A to 6D, 6R, and 6S are connected to other aggregates are fixed by welding or the like to prevent deformation of the heat insulation box.

The wide side surface is a surface facing a wall surface that is not repaired when the heat insulation box is inserted into the carbonization chamber. Although FIG. 1 shows an example in which four aggregates 6A to 6D constitute a wide side surface, the number of aggregates constituting the wide side surface is not limited to a specific numerical value in the present invention. The number of aggregates may be set as appropriate according to the dimensions and weight of the heat insulation box, the strength of the aggregate, and the like.
The narrow side surface is a surface facing a wall surface that requires repair on the opposite side of the wall surface facing the wide side surface when the heat insulation box is inserted into the carbonization chamber. Although FIG. 1 shows an example in which the narrow side surface is constituted by two aggregates 6R and 6S, the number of aggregates constituting the narrow side surface is not limited to a specific numerical value in the present invention. The number of aggregates may be set as appropriate according to the dimensions and weight of the heat insulation box, the strength of the aggregate, and the like.

Further, the surface composed of the aggregates 6D and 6R (hereinafter referred to as a lateral surface) is a surface facing the end wall surface when the heat insulating box is inserted into the carbonization chamber.
The upper surface of the heat insulation box is composed of aggregates 6E to 6J, and the part where the aggregates 6E to 6J are connected to other aggregates is fixed by welding or the like. The upper surface is a surface facing the ceiling surface when the heat insulation box is inserted into the carbonization chamber. Although FIG. 1 shows an example in which the upper surface is constituted by six aggregates 6E to 6J, the number of aggregates constituting the upper surface is not limited to a specific numerical value in the present invention. The number of aggregates may be set as appropriate according to the dimensions and weight of the heat insulation box, the strength of the aggregate, and the like.

  The lower surface of the member is composed of aggregates 6K to 6P, and a portion where the aggregates 6K to 6P and other aggregates are connected is fixed by welding or the like. The lower surface is a surface facing the floor surface when the heat insulation box is inserted into the carbonization chamber. In addition, although the example which comprises a fixed lower surface with six aggregates 6K-6P was shown in FIG. 1, in this invention, the number of the aggregates which comprise a fixed lower surface is not limited to a specific numerical value. The number of aggregates may be set as appropriate according to the dimensions and weight of the heat insulation box, the strength of the aggregate, and the like.

  The aggregate 6Q is not necessarily arranged. However, if the size of the heat insulation box is large, aggregate 6Q is installed for the purpose of improving operability when inserting the heat insulation box into the carbonization chamber, preventing deformation of the heat insulation box, and ensuring the strength of the heat insulation box. Is preferred. Alternatively, the aggregate 6Q may be detachable, the aggregate 6Q may be disposed, and the heat insulating box may be inserted into the carbonization chamber, and then the aggregate 6Q may be removed.

  Thus, the heat insulation box of this invention fills the heat insulating material 7 into the clearance gap between the aggregates of the upper surface, the wide side surface, the narrow side surface, and the lateral surface constituted by using the aggregates 6A to 6Q. The surface of the heat insulating material 7 is covered with a heat resistant stainless steel net 8. An example thereof is schematically shown in FIG. 3 as a cross-sectional view. That is, the heat-resistant stainless steel net 8 is applied to the inner and outer surfaces of the upper surface, wide side surface, narrow side surface, and lateral surface, and the heat insulating material 7 is filled in the gap between the heat-resistant stainless steel net 8. If the heat insulating material 7 is made of a flexible material, for example, ceramic fiber, it is preferable because the heat insulating property is extremely excellent.

  When the heat insulating box having the aggregates 6A to 6Q, the heat insulating material 7, and the heat resistant stainless steel net 8 described above is inserted into the carbonization chamber 2, the wide wall faces the wall that is not repaired as shown in FIG. Insert so that the narrow side faces the wall that requires repair. At that time, the heat insulation box is inserted so that the narrow side surface passes through the repair site 5 and is located further inside the carbonization chamber. Therefore, since the heat insulating material 7 does not exist between the worker who enters the heat insulation box and performs the repair work and the repair portion 5, the worker can repair the repair portion 5.

Thus, when the worker performs repair work on the repair site 5, a sufficient space can be secured in the heat insulation box. And since the cool air in a heat insulation box does not leak into a carbonization chamber, the temperature in the carbonization chamber except a heat insulation box can be maintained constant, and the mineral change of a refractory can be prevented.
In the heat insulation box of the present invention, it is preferable to use steel pipes for the aggregates 6A to 6Q and to circulate cooling air in the steel pipes in order to cool the steel pipes and prevent deformation. The reason is that a steam explosion is prevented by cooling without using cooling water, and repair work can be performed safely.

A heat insulation box having the configuration shown in FIG. 3 was produced, and the heat insulation box was inserted into the carbonization chamber as shown in FIG. 4 to perform hot repair of the repaired portion of the wall surface.
Aggregates 6A to 6Q used steel pipes (JIS standard SGP equivalent, 25A), and cooling air with a pressure of 0.4 MPa was circulated therein.
The heat insulating material 7 was made of 1400 ° C. ceramic fiber, and the heat-resistant stainless steel mesh 8 was made of a heat-resistant stainless steel (equivalent to JIS standard SUS310S). The thickness of the heat insulating material 7 was 75 mm on the top surface, 75 mm on the side surface, 50 mm on the wide side surface, and 50 mm on the narrow side surface. Further, in order to prevent the heat insulating material 7 from falling off, a wire made of heat-resistant stainless steel (equivalent to JIS standard SUS310S) was sewn to bind the heat insulating material 7 to the aggregate.

  Thus, the temperature at the positions of PA and PB in FIG. 4 was measured while performing hot repair of the wall surface while blowing cold air from the outside into the heat insulation box for 20 days. As a result, at the PA position, 700 ° C or higher was always secured, and there was no damage such as cracking or falling off of the refractory. This means that prevention of mineral changes in the refractory has been achieved. On the other hand, the position of PB was always kept below 60 ° C.

  Furthermore, no deformation of the heat insulation box was observed. This means that the aggregates 6A to 6Q are not deformed.

It is a perspective view which shows typically the example of a structure of the aggregate which forms the heat insulation box of this invention. It is sectional drawing which shows typically the example of arrangement | positioning of the carbonization chamber and combustion chamber of a coke oven. It is sectional drawing which shows a heat insulation box typically. It is sectional drawing which shows typically the positional relationship of the repair site | part and heat insulation box at the time of repair work.

Explanation of symbols

1 Combustion chamber 2 Carbonization chamber
3a wall brick
3b Pillar brick 4 Pottery hardware 5 Repair part
6A ~ 6Q Aggregate 7 Heat insulation 8 Heat resistant stainless steel mesh

Claims (1)

A box-shaped heat insulation box inserted into the coking chamber of the coke oven, facing an upper surface facing the ceiling surface of the coking chamber, a lower surface facing the floor surface of the carbonizing chamber, and a wall surface not repaired of the carbonizing chamber A wide side surface, a narrow side surface facing a wall surface that requires repair of the carbonization chamber, and a lateral surface facing the end wall surface of the carbonization chamber are made of aggregate, and the upper surface, the wide side surface, the narrow side surface and the gap between the aggregate of the lateral surface of the heat insulating material is filled in, the aggregate of the heat insulating material is sewn resistant stainless steel wire to cover vital heat insulating material to the surface of the heat insulating material with a heat-resistant stainless steel mesh A heat insulating box characterized in that a steel pipe is used for the aggregate, and cooling air is circulated in the steel pipe .

Images