JPH07247481A - Method for hot repairing of coke oven - Google Patents

Abstract

PURPOSE:To provide a method for hot repairing of the combustion, heat storage and carbonizing chambers of a coke oven, applicable irrespective of types of coke ovens, esp. to a coke oven with two-partitioned combustion chamber, hairpin-type coke oven, single-stage combustion-type coke oven and multi-stage combustion-type coke oven. CONSTITUTION:In conducting a hot repairing of a two-partitioned single- or multi-stage combustion-type coke oven, prior to begin the cooling of parts 8;18 to be repaired, a high-temperature-proof thermal insulation material is inserted, from the top of the coke oven via a peep hole 10, or through the hole at the upper horizontal flue end on the side of the coke oven, into the boundary between the part 8 to be repaired and the high-temperature holding part 9 of the upper horizontal flue 7 situated on the upper part of a combustion chamber 1, thus blocking the heat transfer by way of the flue 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating method for hot repair of a two-division type and / or multi-stage combustion type coke oven.

[0002]

2. Description of the Related Art A coke oven is a structure in which an enormous number of silica bricks and clay bricks are combined and joined by mortar joints.
The operation is performed at a temperature of 1300 ° C and a temperature of the heat storage chamber of 1100 ° C to 300 ° C.

When the coke oven is cooled, the bricks shrink, resulting in cracks in the mortar joints connecting the bricks and causing gas leaks. It is of course possible to avoid cooling during normal operation as much as possible. Even if you have to change the temperature for some reason, pay careful attention,
Cooling is performed after taking measures to minimize the effect on the furnace body.

When a coke oven is used for a long period of time, it becomes obstructive as it ages. In addition, sometimes the brick wall collapse phenomenon occurs. If such a situation is expected, large-scale repairs must be performed to prevent accidents. At that time, since the coke oven cannot be cooled for the reason as described above, the damaged part is surrounded by a heat-insulating wall, a heat-insulating curtain, etc. to separate the repaired part and the unrepaired part, Except for the part to be repaired, cool only the part to be repaired while maintaining the same high temperature as during normal operation, remove the brick wall of the aged part and reload it with new bricks, then gradually raise the temperature. Perform work to return to the work state of. Conventionally, even in all furnace-type combustion chambers,
There was no safe and reliable coke oven wall hot repair method applicable to both the carbonization chamber and the heat storage chamber.

Here, a general structure of the coke oven will be briefly described. Apart from the repair work of the coke oven, the oven itself,
That is, since the carbonization chamber itself needs to be uniformly heated, consumes a small amount of heat, and has a robust and stable structure, various arrangements of the combustion chamber and the heat storage chamber and the supply method of the combustion gas and air need to be devised. Many furnace types have been developed and put into practical use as shown in FIG. 6 by combining these. When the coke oven is classified by the arrangement of the combustion chambers located in the upper half of the coke oven, it can be roughly classified into a two-division type and a hairpin type (other types are considered to be derived from these two types, Description is omitted). Referring to FIG. 6 which describes a typical gas flow in a coke oven, (a) Karlstill type,
(E) Nippon Steel S type is a two-part type, and (b) Coppers type, (c) Otto type, and (d) Nippon Steel M type is a hairpin type.

Further, when classified according to the combustion type, the coke oven can be classified into a single-stage combustion type and a multi-stage combustion type.
Referring to FIG. 6, (b) Coppers type, (e) Nippon Steel S type, and (f) Wilput type are single-stage combustion types,
The (a) Karlstil type, (c) Otto type, and (d) Nippon Steel M type are multi-stage combustion types.

4 and 5 show a known hot repair method for the combustion chamber 51, the carbonization chamber 53 and the heat storage chamber 55 in the coke oven. The illustrated state represents the situation where the end combustion chamber bricks are being reloaded.

The key to the success of hot repair work is perfect insulation. That is, the boundary between the cooling repair part 61 and the high temperature retaining part 62 is completely covered by the heat insulating wall bricks 64, and all communication ports that connect the part to be kept at high temperature and the part to be cooled are completely closed before cooling. It is indispensable to prevent heat leakage and to open it at an appropriate time during the temperature rise after reloading the furnace wall so as not to hinder the subsequent operation. Conventionally, the hot repair was carried out only for the hairpin type single-stage combustion type, so these operations were relatively easy. The target of the normal hot repair is the upper half of the coke oven, that is, the carbonization chamber 53 and the heat storage chamber 55 which are separated by the combustion chamber 51 and the combustion chamber wall brick 52 as shown in the illustrated example.

As a preparatory work for hot repair for the combustion chamber 51 and the like, bricks at the locations shown in FIGS. 5 (a), 5 (b) and 5 (c), that is, the combustion chamber wall bricks 52 and the furnace bottom 56 are furnaces. The bottom brick 57 and the like are removed, and the heat insulating brick 64 is provided between the high temperature retaining section 62 and the combustion chamber 51 and the carbonization chamber 53 that are the objects of repair.
After that, the wall is covered with the heat-insulating curtain 65, the heat-insulating material 67 is installed on the furnace bottom 56, the repair portion is cooled, and after cooling is completed, the bottom of the partition wall 52 is pierced into a hole to the bottom of the combustion chamber. After closing the open air port and gas port to block the flow of heat with the heat storage chamber, a new brick or the like is constructed in place of the old brick.

However, in such a conventional hot repair method for a coke oven, the types of furnaces that can be applied are limited as described above, and it is applicable to both the two-division combustion type coke oven, the hairpin type coke oven, and the single stage combustion. No method has been found that can be applied to both the coke oven and the multi-stage combustion coke oven.

[0011]

An object of the present invention is to devise a method for hot repair of a combustion chamber, a heat storage chamber and a carbonization chamber in a coke oven, which is used in each company as shown in FIG. Regardless of the type of coke oven that is known, existing coke ovens are also applicable to two-division combustion coke ovens, hairpin coke ovens, single-stage combustion coke ovens, and multi-stage combustion coke ovens. This is a possible hot repair method for coke ovens.

[0012]

According to the present invention, this problem is solved by the technical means set forth in the appended claims.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is directed to a two-split single-stage combustion type coke oven according to the present invention.

The combustion chamber 1 is divided into two blocks on the left and right by a central line in FIG. 1 (a). For example, after the combustion chamber 1 on the left side has been burned for a certain time, the combustion chamber on the right side. Combustion occurs in groups. At this time, the carbonization chambers 3 are adjacent to each other in the front-back direction of the coke oven as seen in FIG.
It is provided between. The heat storage chamber 5 is located below each carbonization chamber 2 and is thereby connected to the combustion chamber 1 above.
A carbonization chamber wall 4 is provided as a partition wall between the combustion chamber 1 and the carbonization chamber 3. In order to guide the combustion gas from one combustion chamber group to the other combustion chamber group, an upper horizontal flame passage 7 is provided above the combustion chambers 1 over the entire combustion chambers 1.

In FIG. 1, reference numeral 8 is a cooling repair section, and 9 is a high temperature retaining section which is not a target of repair at present. In order to block the repair site from the high temperature combustion gas and not cool the high temperature retaining part 9, the repair is performed while taking the following measures.

In the two-split single-stage combustion type coke oven, a vertical hole of about 12 cm in diameter called a peephole 10 for observing the inside of the combustion chamber 1 from above the furnace penetrates the furnace top deck, and the upper horizontal flame path 7 Is provided to reach. Further, a slide brick for draft adjustment is provided at the meeting portion of the flame passage common to the combustion chamber 1.

Therefore, the heat insulation work as the first stage of hot repair is performed as follows. That is, before cooling the combustion chamber 1 for repairing the cooling repair unit 8, the supply of gas and air to the combustion chamber row is cut off, and the boundary portion between the entire combustion chamber 1 to be repaired and the high temperature retaining unit 9 is first cut. The slide bricks for draft adjustment in one or two chambers, which are counted from the above, are fully closed, and then the upper horizontal flame path 7 above each combustion chamber 1 that forms the boundary between the high temperature retaining section 9 and the cooling repair section 8 is viewed. An operation member is inserted from the upper portion of the hole 10 or from an end hole of the upper horizontal flame passage 7 to stuff the net-like or fibrous high-temperature resistant heat insulating material to close the upper horizontal flame passage 7. As a result, the high temperature retention section 9
Upper horizontal flame path 7 for the part to be cooled for better repair
Prevents heat transfer from passing through and ensures proper cooling. Closure of the communication portion between the combustion chamber 1 and the heat storage chamber 5 is a known method, that is, the partition wall 2 of the combustion chamber 1 after cooling the repaired portion.
Can be done by breaking.

After cooling the combustion chamber 1 as the second stage of hot repair, when the cooling is completed and the work of removing the bricks of the combustion chamber wall 2 forming the combustion chamber 1 is started, the upper horizontal part on the cooling side is cooled. It is desirable that the high temperature resistant heat insulating material filled in the upper horizontal flame passage 7 on the high temperature retaining portion 9 side is reinforced without removing the filler in the flame passage 7. Immediately before closing the upper horizontal flame passage 7 at the end of the brick-laying work, the high-temperature resistant insulation that had previously blocked the boundary was removed, and ash was added while the temperature was rising. It is replaced by a heat insulating material such as an asbestos board.

As the third stage of hot repair, during the heating operation after the completion of brick transshipment, by removing the previously inserted heat insulating material, it is possible to restore the gas or air flow path after shifting to normal operation. . At this time, due to the use of the above-described ashed heat insulating material, the ashed heat insulating material is used to operate an operating member such as a steel bar from a hole provided in the upper horizontal flame passage 7 of the coke oven side wall or the upper part of the peephole 10 immediately before switching to normal combustion operation. By pushing in to open a hole and connecting the high temperature retaining section 9 and the brick transposing section to each other, a smooth temperature rise is assured, and thereafter the operation can be performed without any trouble.

The above has described the method of filling the upper horizontal flame passages of both the hot portion and the cold portion of the boundary portion with the heat insulating material from above the furnace through the peephole prior to cooling. It is also possible to individually fill the cold parts with the heat insulating material and then shift to the cooling step. Further, instead of replacing the material for blocking the upper horizontal flame passage at the end of brick loading with a material that is incinerated during heating, a high-temperature resistant heat-insulating material may be left, and a method of pulling it up from the peephole onto the furnace at the end of heating may be used.

FIG. 2 shows a repairing method for a two-divided multi-stage combustion coke oven according to the present invention. The combustion chamber 11 is divided into two blocks on the left and right by the center line in FIG. 2A. For example, combustion is performed in the left combustion chamber group and then in the right combustion chamber group. Combustion chamber 11
It is equipped with an air passage 11A and a poor gas passage 11B.
One combustion chamber 11 has a plurality of burners 11 ′ in FIG.
Is equipped with. The carbonization chamber 13 is provided between the adjacent combustion chambers 11 in the front-back direction of the coke oven as seen in FIG. Reference numeral 12 indicates a partition wall of the combustion chamber 11. Heat storage room 1
5 is composed of a heat storage chamber 15A for air and a heat storage chamber 15B for poor gas, the heat storage chamber 15 is located below each carbonization chamber 13, and both chambers 15 and 13 are connected by a heat storage chamber / combustion chamber communication passage 14. There is. A carbonization chamber partition wall 13 ′ is provided as a partition wall between the combustion chamber 11 and the carbonization chamber 13. In order to guide the combustion gas from one combustion chamber group to the other combustion chamber group, the combustion chamber 11
An upper horizontal flame passage 17 is provided above all combustion chambers 11, and an upper horizontal flame passage end hole 17 'is provided at the end of the upper horizontal flame passage 17, and this hole 17' is provided. Is closed during operation and opened during hot repair. Reference numeral 16 denotes a draft adjusting slide brick provided on the upper horizontal flame passage 17.

In FIG. 2, reference numeral 18 is a cooling repair section, and 19 is a high temperature retaining section which is not a target of repair at present.
The heat insulation work as the first stage of hot repair is performed as follows. That is, before cooling the combustion chamber 11 for repairing the cooling repair unit 18, the supply of gas and air to the combustion chamber row is cut off, and first, the boundary portion between the entire combustion chamber 11 to be repaired and the high temperature retaining unit 19 is cut off. From 1 to 2 rooms, fully close the draft adjustment slide bricks 16 and then the peephole 2
The upper horizontal flame passage 17 is filled with mesh-like or fibrous high-temperature resistant heat insulating material to the upper horizontal flame passage 17 above each combustion chamber 11 which forms the boundary between the high temperature retaining portion 19 and the cooling repair portion 18 from the upper portion. Take measures to block it. As a result, heat transfer from the high temperature retaining section 19 to the portion to be cooled for repair is prevented via the upper horizontal flame passage 17, and proper cooling is performed. Next, a method of disconnecting the communication between the heat storage chamber and the combustion chamber is carried out by the method according to claim 3. In the multi-stage combustion system, a large number of burners 11 ′ are opened in the wall 12 of the combustion chamber 11 at the boundary with the high temperature retaining part 19, so that the combustion chamber 11 is completely insulated from the high temperature retaining part 19.
It is necessary to add a method of hanging the heat insulating curtain 21 on the wall 12 of the above after cooling the repair portion.

After cooling the combustion chamber 11 as the second stage of hot repair, the cooling is completed and the combustion chamber wall 1 forming the combustion chamber 11 is finished.
2 At the time of starting the work to remove the bricks, the filling material for the upper horizontal flame passage 17 on the cooling side has not been removed yet, and the high temperature resistant insulating material filled in the upper horizontal flame passage 17 on the high temperature retaining part 19 side is reinforced. It is desirable to keep it. Wall brick transshipment of the combustion chamber 11 and, if necessary, the carbonization chamber 13 and the heat storage chamber 15 is performed. Immediately before closing the upper horizontal flame path 17 at the end of the brick-laying work, the heat-insulating curtain 21 is removed,
Next, the high temperature resistant heat insulating material that has clogged the boundary portion by then is removed, and the high temperature resistant heat insulating material is incinerated during the temperature rise and is replaced by a heat insulating material such as an asbestos board.

As the third stage of hot repair, during the heating operation after the completion of brick transshipment, the previously inserted heat insulating material is removed to restore the gas or air flow path after the normal operation. At this time, by using the above-described ashed heat insulating material, the ashed heat insulating material is opened by pushing the iron bar through the hole provided in the upper horizontal flame passage 17 of the coke oven side wall or the upper part of the peephole 20 immediately before switching to normal combustion operation. The high temperature insulation part 19 and the brick transshipment part are communicated with each other, and the high temperature heat insulating material inserted into the heat storage chamber / combustion chamber communication passage 14 before cooling is also removed from the heat storage chamber side at the same time to smoothly raise the temperature. In addition, the coke oven operation can be performed without any trouble.

The above is a method of filling the upper horizontal flame passages of both the hot and cold portions at the boundary with the heat insulating material from above the furnace through the peephole prior to cooling. It is also possible to individually fill only one with the heat insulating material and then shift to the cooling step. It is also possible to use a method of leaving the high-temperature-resistant heat insulating material instead of replacing the upper horizontal flame road blockage material with the material that is incinerated during heating at the end of brick loading and pulling it up from the peephole to the furnace at the end of heating. .

FIG. 3 shows a repairing method for a hairpin type multi-stage combustion furnace. The combustion chamber 31 is shown in FIG.
As is clear from the above, two adjacent combustion chambers 31 are connected in pairs in a hairpin shape. Since the combustion chamber 31 itself is a multi-stage combustion type, it is provided with a plurality of burners, in the illustrated example, two burners 31 ', 31', and the air passage 31A and the poor gas passage 11B communicate with the combustion chamber 31. There is. Figure 3
According to (b), the carbonization chamber 33 is located between the combustion chambers 31 in the front-back direction of the hairpin type multi-stage combustion furnace. 32
Indicates a combustion chamber partition wall. Below the carbonization chamber 33 is a heat storage chamber 35.
The heat storage chamber 35 includes a heat storage chamber 35A for poor gas or air and a heat storage chamber 35B for removing exhaust gas. The combustion chamber 11 and the heat storage chamber 35 are connected by a heat storage chamber / burner communication path 34. 38 is a hot repair department,
Reference numeral 39 indicates a high temperature retaining section. 40 is a peephole.

The heat insulation work as the first stage of hot repair is performed in hairpin units. That is, before cooling the combustion chamber 31 for repairing the cooling repair section 38, first, in order to thermally separate the combustion chamber 31 to be repaired and the high temperature retaining section 39, first, heat the front side of the carbonization chamber 33. The wall of the carbonization chamber 33, which faces the combustion chamber 31 to be constructed and repaired, is covered with a heat insulating curtain to insulate the wall, and the heat insulation of the bottom of the carbonization chamber 33 surrounded by the heat insulating wall and the heat insulating curtain is performed next. The first stage is completed by shutting off heat between the combustion chamber and the heat storage chamber.

After that, the repair section is cooled, and the combustion chamber wall brick 32 is used.
It will be repaired by transshipping with new bricks.
In the third stage of hot repair, the temperature of the repair part is raised, but at the end of the temperature raising step, the heat insulating material blocking the heat storage chamber / combustion chamber communication passage 34 is removed. As a result, normal operation after completion of temperature rise can be performed without hindrance.

[0029]

EFFECTS OF THE INVENTION According to the present invention, in the coke oven, which cannot be hot repaired by the conventional method, the high temperature retaining part and the hot repairing part are properly insulated so that the high temperature retaining part is not affected. A method for hot repairing the combustion chamber, the heat storage chamber, and the carbonization chamber has been devised, whereby the hot repair work of the coke oven of each conventionally known company can be performed without hindering the subsequent operation of the coke oven. You can

[Brief description of drawings]

FIG. 1 shows a two-division single-stage combustion type coke oven which is a target of hot repair of a coke oven to which the present invention is applied, (a) is a front view thereof, and (b) is a partial sectional view thereof.

FIG. 2 shows a two-division multi-stage combustion type coke oven to which the present invention is applied, and (a) is a line IIa-IIa, II of FIG. (B).
FIG. 7A is a partial cross-sectional view taken along line a′-IIa ′, and FIG. 9B is a partial cross-sectional view taken along lines IIb-IIb and IIb′-IIb ′ in FIG.

FIG. 3 shows a hairpin multi-stage combustion type coke oven to which the present invention is applied, (a) is a front sectional view, and (b) is a side sectional view.

FIG. 4 is a view showing a coke oven including a combustion chamber, a carbonization chamber and a heat storage chamber, which are targets of hot repair of a known coke oven, in which (a) is a front view and (b) is a side view thereof. It is a figure.

5A and 5B are views showing a coke oven including a combustion chamber, a carbonization chamber, and a heat storage chamber, which are targets of hot repair of a known coke oven, in which FIG. 5A is a front view thereof, and FIG. , And (c) is a top view thereof.

FIG. 6 is a schematic diagram showing a typical gas flow (when a poor gas is used) in a known coke oven, in which (a) is a Karlstil system, (b) is a Coppers system, and (c) is an Otto system. (D) Nippon Steel M type, (e) Nippon Steel S type, and (f) are diagrams showing respective gas flows (when poor gas is used) in the Wilput type.

[Explanation of symbols]

 1 Combustion chamber 2 Combustion chamber partition wall 3 Carbonization chamber 4 Carbonization chamber partition wall 5 Heat storage chamber 7 Upper horizontal flame passage 8 Cooling repair part 9 High temperature retention part 10 Peephole 11 Combustion chamber 12 Combustion chamber partition wall 13 Carbonization chamber 14 Heat storage chamber / combustion chamber communication Road 15 Heat storage chamber 16 Draft adjustment slide brick 17 Upper horizontal flame passage 18 Cooling repair part 19 High temperature retention part 20 Peephole 21 Heat gas blocking heat-insulating curtain 31 Combustion chamber 32 Combustion chamber partition wall 33 Carbonization chamber 34 Heat storage chamber / combustion chamber communication Road 35 Heat storage chamber 38 Cooling repair part 39 High temperature retention part 40 Peephole 51 Combustion chamber 52 Combustion chamber groove wall brick 53 Carbonization chamber 55 Heat storage chamber 56 Furnace bottom 57 Furnace bottom brick 61 Cooling repair part 62 High temperature retention part 64 Insulation brick 65 Insulation Curtain 67 insulation

Claims (3)

[Claims] 1. When hot repairing a two-division single-stage or multi-stage combustion type coke oven, prior to starting cooling of a cooling repair section (8; 18), a peephole (10; 2) is provided from the top of the coke oven.
0) or through the upper horizontal flame passage end hole (17 ') on the side of the coke oven, the high temperature resistant insulation is placed in the upper horizontal flame passage (7; 17) located above the combustion chamber (1; 11).
A coke oven characterized by being inserted into the boundary between the high temperature retaining section (9; 19) and the cooling repair section (8; 18) of the above to block the transfer of heat via the upper horizontal flame passage (7; 17). Hot repair method. 2. The upper horizontal flame passage (7; 1) at the end of the work of cooling the cooling repair part (8; 18) and reloading bricks.
The high temperature resistant heat insulating material inserted in 7) is replaced with a heat insulating material which is incinerated during the temperature raising process, and after the temperature raising is completed, the upper horizontal flame end hole (17 ') or the peephole (10 The hot repair method for a coke oven according to claim 1, wherein the high temperature retaining section and the brick transposing section are communicated with each other by inserting an operating member from the above, and pushing down the ashed heat insulating material. 3. A two-split multi-stage combustion coke oven or hairpin, in which gas and air are supplied in multiple stages into the combustion chamber (11; 31) via conduits that penetrate vertically through the combustion chamber partition bricks (12; 32). In the hot repair method of the multi-stage combustion type coke oven, before starting the cooling of the part to perform the brick transshipment work,
Inserting a high temperature resistant heat insulating material from the heat storage chamber (15; 35) side into the heat storage chamber / combustion chamber communication path (14; 34) to prevent heat transfer to the cooling part, while raising the temperature after completing the brick transshipment In addition, a hot repair method for a coke oven, characterized in that the flow path of gas and air after normal operation transfer is restored by removing the previously inserted heat insulating material.