JPH0589437U - Coke oven top refractory structure - Google Patents

Abstract

(57) [Summary] [Purpose] Coke oven Prevents the penetration of coal tar, etc. into the pores of furnace bricks and insulation bricks at the top of the furnace or into the base metal structure. [Structure] In a coke oven top refractory structure constructed of a regular refractory or an irregular refractory, a stainless steel foil 6 is interposed between the ceiling brick 3 of the carbonization chamber 1 and the combustion chamber and the top refractory. Coke oven made of refractory structure at the top of the furnace. [Effect] Lifting of bricks on the furnace, lifting of charging account money, breakage and corrosion of furnace tightening tie rods, and tar sticking are eliminated.
It is possible to reduce the cost of transshipment and repair of furnace top bricks, reduce the heat dissipated from the furnace top by lowering the thermal conductivity of the furnace top brick, and improve the working environment on the furnace.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refractory structure at the top of a coke oven that is constructed of regular refractory or irregular refractory.

[0002]

[Prior Art]

 In general, coke ovens are mainly composed of silica bricks and clay bricks, and are constructed by a small amount of heat insulating bricks and red bricks, and the back stays on the side of the furnace body are elastically clamped and held by the upper and lower cross tie rods. Then, when the operation starts, a life of 30 to 40 years is required. The top of the coke oven is located above the carbonization chamber ceiling and the combustion chamber ceiling, and the brick thickness is 1.0 m to 1.3 m. The surface of the furnace top is about 60 ° C because it cools in contact with the atmosphere. However, the deep portion has a high temperature of 800 to 900 ° C. due to heat transfer from the carbonization chamber and the combustion chamber. In addition, it is affected by weather conditions such as rainfall and snowfall, and temperature changes due to the operating rate of the coke oven.

Therefore, the refractory forming the furnace top is exposed to the bad condition of repeated expansion and contraction. Clay bricks are used for the ceiling bricks in the ceiling of the coking chamber of a typical coke oven, because the temperature changes drastically due to the opening of the charging lid at the time of charging coal and burning off the carbon in the part near the charging port. The other parts are made of silica stone bricks, which is a combination of different bricks. Therefore, the joints of the ceiling bricks are different in the coefficient of thermal expansion due to the temperature change in the carbonization chamber and the combination of different bricks (0.5-0.6% of clay bricks, 1.1-1.2% of silica bricks, (At 1000 ° C.) causes joint opening. Insulating bricks are partially used for the upper part of ceiling bricks, but cheap red bricks are mainly used, and joints are filled with mortar and bonded. As a result, the strength of the bricks on the furnace and the heat insulating bricks that compose the refractory at the top of the furnace decreases, and damages such as cracking and crushing due to repeated expansion and contraction due to temperature changes occur, and the surrounding joints also do the same. The joints are opened and damaged, which causes gas leakage from the carbonization chamber.

Further, since the bricks on the furnace and the heat insulating bricks themselves have high porosity and low denseness, coal tar and the like contained in the leaked gas penetrate deeply into the pores or the base metal structure, resulting in a thermal expansion coefficient, The thermal conductivity rises and the bricks on the top of the furnace float up, and damage to the top of the furnace occurs, such as floating up of the charging account. Similarly, the increase in heat dissipated from the furnace top surface due to the increase in thermal conductivity is due to an increase in the amount of dry distillation heat, a deterioration in the work environment due to the temperature of the brick surface on the furnace rising to 100 ° C or more, and the leakage gas from the furnace top surface. It is also a cause of pollution such as black smoke emission from the chimney due to inflow of air into the atmosphere and incomplete combustion due to inflow into the combustion chamber.Preventing gas leakage to the top of the furnace is to prevent gas leakage from the coke oven. It is also important in terms of stable operation and pollution prevention.

[0005]

[Problems to be solved by the device]

 Therefore, when the bricks at the top of the furnace floated up, the deposits in the charging account floated up, or gas leaked from the furnace top, the bricks at the top of the furnace were partially dismantled or near the ceiling bricks, and the bricks were removed. Transshipping. However, at the brick transshipment section, the satisfactory results cannot be obtained because the bricks at the top of the furnace again floated up in the next few years, the charge of the charging account floated up, or gas leaked from the furnace top.

An object of the present invention is to provide a refractory structure for the top of a coke oven that can prevent the infiltration of coal tar or the like into the pores of the furnace top of the coke oven furnace, the pores of the heat insulating brick, or the base metal structure. is there.

[0007]

[Means for Solving the Problems]

 The present inventors have made various studies to achieve the above object. As a result, a low porosity foil that withstands high temperatures is inserted between the ceiling bricks in the carbonization and combustion chambers and the heat-insulating bricks and furnace bricks that make up the furnace top refractory to seal the bricks, and the bricks are cut off. We came to the conclusion that it was effective to prevent the intrusion of leaked gas from the part, and reached the present invention.

That is, the present invention relates to a furnace top refractory structure of a cokes furnace constructed of a regular refractory or an irregular refractory, and a stainless steel foil is provided between the ceiling bricks of the carbonization chamber and the combustion chamber and the top refractory. It is a refractory structure at the top of the coke oven, which is characterized by the inclusion of a steel sheet.

[0009]

[Action]

 In this invention, a stainless steel foil was interposed between the ceiling bricks of the carbonization chamber and the combustion chamber and the refractory material on the furnace top, so that jointing and cracks occurred in the ceiling bricks of the carbonization chamber and the combustion chamber, and the carbonization chamber was cracked. Even if the coke oven gas leaks from the coke oven gas into the furnace refractory, the ceiling bricks in the carbonization and combustion chambers and the furnace top refractory are sealed by the intervening stainless steel foil. Infiltration of coal tar is prevented and coal tar is prevented from penetrating into the pores of heat insulating bricks and furnace bricks that compose the furnace refractory. As a result, it is possible to prevent an increase in the surface temperature of the furnace top brick due to an increase in the thermal conductivity of the heat insulating brick or the brick on the furnace, and it is possible to maintain the low temperature for a long time. In addition, it is possible to prevent damage to the furnace top such as floating bricks on the furnace top and floating deposit money.

In the present invention, the stainless steel foil interposed between the ceiling bricks of the carbonization chamber and the combustion chamber and the furnace refractory is a portion in the temperature range of about 500 ° C. above the ceiling bricks of the carbonization chamber and the combustion chamber. A stainless steel foil may be placed on top of it, on top of which heat insulating bricks and furnace bricks may be stacked. In this case, by interposing the stainless steel foil under the cross tie rod that is tightening the bricks of the coke oven furnace, it is possible to prevent the cross tie rod from being damaged or corroded due to an abnormally high temperature, and fixing tar.

[0011]

【Example】

 Embodiment 1 Details of the present invention will be described below with reference to FIG. 1 showing an embodiment. FIG. 1 is a vertical cross-sectional view showing the main part of the refractory structure at the top of the coke oven of the present invention. In FIG. 1, 1 is a carbonization chamber, 2 is a flue hole in the upper part of the combustion chamber, 3 is a ceiling brick made of a brick of the carbonization chamber 1, 4 is a red brick stacked on the ceiling brick, and 5 is a flue hole. 2 clay pipe brick, 6 stainless steel foil laid on top of red brick 4 and clay pipe 5; 7 heat insulating bricks piled on top of stainless steel foil 6; 8 heat insulating bricks 7 It is a top brick. When the coke oven gas leaks from the carbonization chamber 1 due to the breakage or cracking of the ceiling bricks 3, the coke oven gas is sealed by the stainless steel foil 6, and the coke oven gas heat insulating bricks 7 and furnace tops are sealed. It will be constructed so that it can be prevented from entering the 8 bricks. In addition, 9 is a cross tie rod in the furnace length direction.

With the above-described structure, the ceiling bricks 3 in the carbonization chamber 1 were broken or cracked, and the coke oven gas leaked from the carbonization chamber 1 and invaded into the red bricks 4 above the ceiling bricks 3. Even so, since the upper surface of the red brick 4 is sealed by the spread stainless steel foil 6, the leaked coke oven gas is prevented from entering the heat insulating brick 7 and the furnace top brick 8. As a result, the penetration of coal tar into the pores of the heat insulating bricks 7 and furnace bricks 8 is prevented, and the rise of the surface temperature of the furnace top bricks due to the increase in the thermal conductivity of the heat insulating bricks 7 and furnace bricks 8 is prevented. Thus, the low temperature can be maintained for a long time. Further, it is possible to prevent damage to the furnace top such as floating of the bricks 8 on the furnace and floating of the charging account.

Example 2 In a coke oven having a furnace height of 6000 mm, a furnace length of 15560 mm and a furnace width of 450 mm, as shown in Example 1 when transcribing furnace top bricks, a stainless steel foil having a thickness of 0.1 mm was formed. No. 1 of the present invention, which is laid on the upper surface of the red brick and is sealed by interposing a stainless steel foil also at the boundary with the brick which is not transshipped. The thermal conductivity of the heat insulating bricks and the coefficient of thermal expansion of the furnace bricks were measured one year after transshipping. The results are shown in Table 1. In addition, the brick surface temperature at the furnace top was measured. The results are shown in Table 2. The thermal conductivity and the thermal expansion coefficient are both measured values at 500 ° C.

[0014]

[Table 1]

[0015]

[Table 2]

As shown in Table 1, in the case of the comparative example in which the stainless steel foil was not used, compared with the case of the present invention in which the coal tar penetrated into the heat insulating brick and was sealed with the stainless steel foil, The conductivity has increased 11 times, and the heat insulation effect has almost disappeared. The coefficient of thermal expansion of the bricks on the furnace was also increased by 8%. Further, as shown in Table 2, the surface temperature of the bricks on the furnace was 62 ° C in the present invention, and 105 ° C in the comparative example, which was about 40 ° C.

[0017]

[Effect of the device]

 As described above, according to the present invention, the infiltration of coal tar due to the leakage of coke oven gas to the top brick part can be prevented, the brick on the furnace floats up, the charge of the charging account rises, and the tie rod of the furnace tightening is prevented. Breakage, corrosion, and tar sticking are eliminated, and the cost of brick top transshipment repair work can be reduced and the life of the furnace body can be extended. Moreover, it is possible to reduce the heat dissipated from the top of the brick due to the decrease in the thermal conductivity of the brick at the top of the furnace and to improve the working environment of the furnace.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a main part of a refractory structure at a top of a coke oven according to the present invention.

[Explanation of symbols] 1 carbonization chamber 2 flue hole 3 ceiling brick 4 red brick 5 clay pipe brick 6 stainless steel foil 7 heat insulating brick 8 furnace brick 9 cross tie rod

Claims (1)

[Scope of utility model registration request] 1. A coke oven top refractory structure constructed of a regular refractory or an irregular refractory, wherein a stainless steel foil is interposed between the ceiling bricks of the carbonization chamber and the combustion chamber and the top refractory. Coke oven top refractory structure characterized by