JP3092148B2 - Coke oven lid preheating device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furnace head preheating apparatus for easily adjusting a knife edge of a newly installed furnace lid when replacing a damaged furnace lid of a coke oven for repair. About.

2. Description of the Related Art In general, a furnace lid of a coke oven has a structure in which a knife edge of the oven lid is pressed into contact with a frame of a coke oven kiln by elasticity of a bar spring and sealed.

This furnace lid may be damaged by thermal distortion of the knife edge during long-term use, poor sealing due to adhesion of tar, etc.
Insufficient allowance (adjustment allowance) of the knife edge due to thermal distortion of the furnace lid body occurs, and the sealing becomes insufficient, resulting in gas leakage. Therefore, the furnace lid of the coke oven needs to be replaced in a predetermined cycle.

For this reason, in a normal coke mill, a furnace cover repair stand is installed at the furnace end of the coke oven or between the coke ovens, and it always has several repaired spare furnace covers. The furnace lid is replaced and repaired in the cycle.

To replace the furnace lid, remove the furnace lid used up to that point from the kiln opening with the extruder or furnace lid detacher attached to the coke guide car, transport it to the furnace lid repair table, install it, and then make preliminary repairs The completed furnace lid is gripped by the furnace lid detacher, transported to the kiln mouth, and attached to the kiln mouth.

In this case, the repaired furnace lid is in a state where there is no thermal distortion at room temperature, unlike the case where the furnace lid is mounted in a coke oven kiln. On the other hand, the kiln frame is in a heated state, and thermal distortion occurs.

The thermal distortion generated in the kiln frame is such that the central part in the vertical direction of the carbonization chamber protrudes. Causes thermal distortion in the protruding shape.

The thermal distortion of the furnace opening frame and the furnace lid has a shape in which the central portion in the vertical direction of the carbonization chamber protrudes from each other, and a gap that extends in the vertical direction from the central portion of the furnace lid is generated.

For this reason, if the furnace lid at room temperature, which has been repaired and has no thermal distortion, is attached to the kiln frame as it is, the tip of the knife edge will be in the kiln opening in the vertical direction of the lid, especially in the upper part from the upper bar and the lower part from the lower bar. Since it does not touch the frame, it is necessary to strike the knife edge until it contacts the kiln frame.

In addition, after the knife edge is beaten out and adjusted when the furnace lid is attached to the kiln opening, thermal distortion is sequentially generated by heat from the carbonization chamber, and gas leakage occurs. For this reason, for about 5 days after the replacement of the furnace lid, it is necessary to perform an adjustment operation to strike out the knife edge and prevent gas leakage.

Problems to be Solved by the Invention The replacement of the furnace lid according to the conventional method is to mount the repaired room temperature furnace lid without heat distortion on the kiln frame in which the heat distortion has occurred. A gap is formed between the tips of the knife edges in the vertical direction from the center, and the gap is adjusted by tapping the knife edge to seal gas leakage. However, this operation is a heavy-strength operation under high temperature, and requires much time and labor.

Further, since the furnace lid to be mounted is at room temperature and generates thermal distortion every day, it is necessary to strike and adjust the knife edge every day for about 5 days.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coke oven furnace head preheating apparatus which can simplify a gas leak adjusting operation by knocking out a knife edge at the time of replacing the furnace lid by the conventional method.

Means for solving the problem In order to achieve the object, the repaired furnace lid to be replaced is preheated by a furnace lid preheating device to be in a state where thermal distortion has occurred, and then replaced, It is possible to reduce the gas leak adjustment work by beating the knife edge.

That is, the furnace lid preheating device of the present invention comprises a heating section which communicates with a chimney having a bar engaging rod for holding the furnace lid of a coke oven and a chimney having an opening through which the furnace lid brick section enters, and a burner and an air intake port at the bottom. The furnace lid preheating furnace composed of the burning part is installed so that the furnace lid holding position corresponds to the coke oven carbonization chamber kiln position.

In the present invention, the preheating of the furnace lid after completion of the repair is performed by: a bar engaging rod that holds the furnace lid of the coke oven; a heating section that communicates with a chimney having an opening into which the furnace lid brick section enters; And a furnace preheating furnace consisting of a combustion section having an air intake. Since the furnace lid preheating furnace is installed with the furnace lid holding position corresponding to the coke oven carbonization chamber kiln opening position, the furnace lid is attached to or detached from the extruder and the coke guide car equipped with a furnace lid detacher. be able to. It is advisable to set the installation position in the vicinity of the repaired spare furnace lid storage area on the machine side and the coke side, such as the furnace end of the coke oven or between furnaces. This transfers the furnace lid to be repaired to the furnace lid repair table, and immediately replaces the repaired preheated furnace lid with
It can be gripped, transported and mounted. The preheating of the furnace lid
Adjust the preheating temperature, preheating time, etc., to match the previously measured temperature of the furnace lid attached to the furnace opening of the furnace room to be replaced. Generally, it is 24 hours for a furnace lid in which a refractory is replaced, and 3 hours for a furnace lid in which only a knife edge is replaced.

EXAMPLES Example 1 FIG. 1 is a schematic explanatory view of a furnace lid preheating furnace, in which (a) is a front view, (b) is a side sectional view, and FIG. 2 shows an example of an installation place of a furnace lid preheating apparatus. FIG.

In FIG. 2, a preferable place for installing the furnace lid preheating device is a fireside deck (2) of a coke oven group (1).
The furnace lid repair table (3) is being installed. Since the furnace lid preheating device (4) is installed by using a furnace lid detacher (not shown) installed in the extruder (5) and the coke guide wheel (6), the preheated furnace lid is gripped and transported. In order to mount the furnace lid repaired to the furnace lid preheating device (4) by the above furnace lid detacher, the furnace lid mounting position was set on the machine side and the coke side in the vicinity of the furnace lid repair table (3). It is installed corresponding to the position of the kiln opening of the furnace.

As shown in FIG. 1, the furnace lid preheating device (4) has a bar engaging rod (8) for holding the furnace lid (7) on the side and an opening (10) into which the furnace lid brick (9) enters. It has a heating section (12) leading to a chimney (11) and a combustion section (15) having a gas burner (13) and an air intake (14) at the bottom.

The preheating of the furnace lid (7) is performed by holding the furnace lid (7), which has been repaired at the furnace lid repair stand (3), with a furnace lid detacher installed on an extruder (5) or a coke guide truck (6). Then, the bar (16) of the furnace lid (7) gripped by operating the furnace lid detacher is moved to the position of the furnace lid preheating device (4), and the bar engaging rod (8) of the furnace lid preheating device (4) is moved. And set the furnace lid (7) in the furnace lid preheating device (4).

Then, the lower gas burner (13) is ignited to preheat the furnace lid at a predetermined heating rate. In this case, for the furnace lid (7) to be preheated, the temperature of the furnace lid mounted in the furnace chamber to be replaced is measured in advance, and the degree of preheating is adjusted to match the temperature. Therefore, thermocouples are attached to several places of the furnace lid (7), and the amount of combustion gas is adjusted based on the temperature measurement results.

This preheating causes the furnace lid (7) to have almost the same distortion as when it is mounted in the furnace chamber. Therefore, if the knife edge is beaten out and adjusted when the furnace lid is replaced, the knife edge is then distorted due to the furnace lid distortion. Elimination adjustment is not required. For this reason, the knife edge adjustment time can be greatly reduced compared to the conventional method in which the furnace lid at room temperature is directly attached, and the knife edge punching adjustment due to the distortion of the furnace lid for several days after the replacement of the furnace lid is unnecessary. .

If the knife edge is beaten out and adjusted according to the distortion of the furnace lid (7) when the preheating in the furnace lid preheating device (4) is completed, the knife edge adjustment time at the time of replacement is greatly reduced. Can be shortened.

Example 2 Using the furnace lid preheating device shown in Example 1, the furnace height was 7125 mm,
A preheater is installed by attaching thermocouples in advance to various places on the repaired furnace lid of a coke oven with a furnace width of 460 mm.
The distortion of the furnace lid at each position shown in the figure was measured.

Table 1 shows a comparison between the distortion of the furnace lid at room temperature measured before preheating and the distortion and the temperature of the furnace lid after being attached to the above coke oven during operation.

As shown in Table 1, the furnace lid at room temperature has almost no distortion. On the other hand, the furnace lid after preheating and after being attached to the furnace have almost the same distortion.

This means that when replacing the furnace lid, if the newly installed furnace lid is preheated in advance, if the knife edge is knocked out and adjusted during replacement, knife edge adjustment due to distortion of the furnace lid hardly occurs thereafter. It shows.

Example 3 Using the furnace lid preheating device shown in Example 1, the furnace height was 7125 mm,
A coke oven with a furnace width of 460 mm was preheated by attaching a thermocouple to the center of the repaired oven lid in advance. Then, in the case where the refractory of the furnace lid was replaced (A) and in the case where only the knife edge was replaced (B), the temporal change of the furnace lid temperature from the start of preheating was measured. The result is shown in FIG.

As shown in FIG. 4, the furnace lid (A) in which the refractory was replaced, the furnace lid (B) in which only the knife edge was replaced for 24 hours.
Then, by preheating for 3 hours, the furnace lid could be preheated to the same temperature as that during use in the coke oven.

According to the furnace lid preheating device of the present invention as described above,
When the furnace lid is replaced, the newly installed furnace lid can be preheated, and when the furnace lid is installed, the knife edge is simply knocked out and adjusted. Heavy muscle work can be greatly reduced.

[Brief description of the drawings]

1 (a) and 1 (b) are schematic explanatory views of a furnace lid preheating apparatus of the present invention, wherein (a) is a front view, (b) is a side sectional view, and FIG. 2 is a furnace lid preheating apparatus of FIG. FIG. 3 is an explanatory view showing a measuring position of a furnace lid in Example 2 and FIG.
FIG. 11 is a graph showing the relationship between the preheating time and the furnace lid temperature in Example 3. DESCRIPTION OF SYMBOLS 1 ... Coke oven group, 2 ... Fireside deck, 3 ... Head cover repair table, 4 ... Head cover preheating device, 5 ... Extruder, 6 ... Coke guide car, 7 ... Head cover, 8 ... … Bar engaging rod, 9… Brick part of furnace lid, 10… Opening, 12… Heating section, 13… Gas burner, 14… Air intake port, 15… Combustion section, 16… Bar

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-263486 (JP, A) JP-A-4-89899 (JP, A) JP-B-39-11463 (JP, B1) JP-B-38- 26455 (JP, B1) JP 30-2780 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10B 25/06 C10B 29/04 C10B 45/00

Claims (1)

(57) [Claims] 1. A heating section which communicates with a chimney having a bar engaging rod for holding a furnace lid of a coke oven and an opening into which a furnace lid brick section enters, and a combustion section having a burner and an air intake at a lower portion. A furnace lid preheating apparatus characterized in that a furnace lid preheating furnace is installed corresponding to a furnace lid holding position corresponding to a coke oven carbonization chamber kiln opening position.