JPH01315487A - Method for repairing coke oven - Google Patents

Abstract

PURPOSE:To efficiently carry out repairing an oven wall by pressing a refractory mortar from the side of a combustion chamber into a cracked part of the oven wall in a coke oven having plural alternately arranged carbonization and combustion chambers. CONSTITUTION:A carbonaceous substance 7 sticking to the surface of an oven wall 3 on the side of a carbonization chamber 1 is positively utilized in view of a distribution state of cracks 9 in the oven wall 3 to press and fill a refractory mortar from the side of the combustion chamber 2 into the cracks 9. The filled mortar flows along the branched state of the cracks 9 to the side of the carbonization chamber 1 and diffuses into the fine parts of the cracks directly under the fluid pressure applied at the time of pressing in the mortar.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for repairing a coke oven wall in which cracks that cause gas leakage have occurred due to repeated temperature changes.

[Conventional technology]

A coke oven is known as a device that carbonizes coal to produce coke. A conventional coke oven has a heat storage chamber in the lower part, and carbonization chambers and combustion chambers in the upper part. Then, due to the heat given from the combustion chamber through the partition wall,
The coal charged in the carbonization chamber is carbonized.

At this time, the temperature inside the carbonization chamber is repeatedly raised and lowered over a range from room temperature immediately after charging the coal to the maximum carbonization temperature of approximately 900°C. As a result, cracks occur in the ceiling, furnace walls, etc. that make up the carbonization chamber.

If this crack penetrates into the combustion chamber, the raw gas inside the coking chamber leaks into the combustion chamber, lowering the pressure inside the coking chamber and the temperature of the combustion chamber, which in turn has an adverse effect on the carbonization reaction of coal in the coking chamber. give. Furthermore, if raw gas is released from the cracks that are released to the atmosphere, it can cause air pollution.

FIG. 2 schematically shows the furnace wall where this crack occurred. Since the furnace wall 3 that partitions the carbonization chamber 1 and the combustion chamber 2 is made of brick, a paring section 4 is provided therein. At the location where this selvage portion 4 is located, the bricks constituting the furnace wall 3 have different thicknesses, so the amount of thermal expansion differs, and gaps 5 are likely to occur.

Therefore, fireproof mortar is filled between the bricks constituting this paring section 4. However, the raw gas 8 passes through the old mortar 6 and carbon material 7 attached to the wall on the side of the carbonization chamber 1.
flows into the gap 5 and tends to cause cracks in the mortar filled in the gap 5. When the crack reaches the combustion chamber 2, raw gas 8
will leak into the combustion chamber 2. Further, the raw gas 8 may leak into the combustion chamber 2 through cracks that occur not only in the paring section 4 but also in other parts of the furnace wall 3.

Therefore, the coke oven should be inspected periodically, and if cracks are found, dry spraying should be performed on the wall as shown in Coke Saki Niller Vol. 26, No. 2 (1977), pages 99-101. or by spraying the material or
As in Japanese Patent No. 67701, it has been proposed to spray dry mortar together with compressed air to repair joint breaks that have occurred in the furnace wall. This repair is carried out from the carbonization chamber side because of the charging opening or side opening and the low internal temperature, and because it is easy to discharge the scattered mortar when spraying, and it is quite effective as a joint repair. I'm raising it.

[Problem to be solved by the invention] However, since there are many cracks in the furnace wall on the side of the carbonization chamber, it is necessary to apply mortar to the entire surface of the furnace wall, and the amount of mortar consumed is large. becomes. In addition, since tar and the like produced as by-products of the coking reaction adhere to the wall surface on the side of the carbonization chamber, it is necessary to remove the deposits from the wall surface prior to applying mortar. Moreover, the wall surface cannot be repaired until after the generated coke is removed.

Therefore, an object of the present invention is to eliminate these drawbacks and effectively repair a coke oven with less mortar consumption by repairing the oven wall from the combustion chamber side.

[Means to solve the problem]

In order to achieve the objective, the coke oven repair method of the present invention, when repairing the oven wall of a coke oven in which a plurality of coking chambers and combustion chambers are arranged in an alternating manner, includes: It is characterized in that refractory mortar is press-fitted from the combustion chamber side.

[Effect]

As shown in FIG. 3, the cracks 9 that occur in the furnace wall 3 have many starting points on the surface of the furnace wall 3 on the coking chamber l side, and the individual cracks 9 merge toward the combustion chamber 2, causing the combustion chamber to open. There are openings in a few places on the second side. This is considered to be because the wall surface on the side of the carbonization chamber 1 is repeatedly exposed to large temperature changes.

Furthermore, as described above, there are deposits such as carbonaceous material 7 on the surface of the furnace wall 3 on the side of the carbonization chamber 1.

Therefore, in the present invention, cracks 90 in the furnace wall 3
The cracks 9 are removed from the combustion chamber 2 side by actively utilizing carbon particles 7 etc. attached to the surface of the furnace wall 3 on the carbonization chamber 1 side.
is filled with refractory mortar. The filled mortar flows toward the carbonization chamber 1 along the branching state of the cracks 9. That is, when filling the refractory mortar from the combustion chamber 2 side, the number of openings of the cracks 9 is smaller than that from the carbonization chamber 1 side, so the number of places to apply mortar can be reduced. In addition, since the tip of the crack 9 is closed with deposits such as the carbonaceous material 7, the press-fitted refractory mortar reaches the details of the crack 9 with almost the same fluid pressure at the time of press-fitting.

〔Example〕

FIG. 1 shows a furnace wall being repaired according to the present invention.

A futon installed above the combustion chamber 2 of the coke oven! J,
-10 is normally closed with a lid.

When repairing the furnace wall, this F'J5-10 is released and the location where the crack 90 has occurred is detected by an appropriate means.

Then, the tip of the press-fitting lance 11 inserted into the -to is pushed into the crack 9. °It should be noted that a collar (not shown) may be attached to a position slightly set back from the tip of the press-fit lance 11 so that this collar is pressed against the surface of the furnace wall 3 when the tip is pushed into the crack 9. good.

In this example, a material obtained by kneading clay mortar with 30% moisture was used. This mortar is stored in the tank 18 and press-fitted with a lance l at a discharge pressure of 20 kg/cj.
It was press-fitted into the crack 9 through 1. At this time, press-fit lance 1
The mortar 12 that flowed out from the gap between the mortar 1 and the furnace wall 3 was stopped by the tray 13, and was prevented from falling into the combustion chamber 2. In addition, the receiver is the packing 1 provided around the stand 13.
4, the receiver sealed the space between the stand 13 and the furnace wall 3. Further, the height position of the receiver stand 13 was adjusted in accordance with the location where the crack 9 occurred by moving up and down a shirt 16 provided on a support 15 placed on the ceiling of the coke oven. Note that the reference number 17 indicates coke generated in the carbonization chamber 1.

The refractory mortar press-fitted from the combustion chamber 2 side flowed toward the carbonization chamber 1 side along the branched cracks 9 as shown in FIG. 3, and filled the cracks 9. The cracks 9 filled with mortar in this manner did not cause the raw gas 8 to leak again even after the coke oven was operated for 150 days. In addition, the consumption of mortar used for repair is 1
．． It was 0 kg/combustion chamber. (Composed of 30 combustion chambers/1 carbonization chamber) On the other hand, when repairs are made from the carbonization chamber 1 side, the starting points of cracks 9 are dispersed over the entire surface of the furnace wall 3, so the mortar covers almost the entire surface. The consumption amount was as large as 50.0 kg/carbonization chamber. Additionally, the applied mortar had weak adhesion (and raw gas leaked from the same location again after 100 days).

〔Effect of the invention〕

As explained above, in the present invention, by repairing the furnace wall from the combustion chamber side, the mortar can be cracked with high adhesive force without being affected by deposits such as carbon on the furnace wall surface. can be filled. Moreover, since there are only a few cracks that open toward the combustion chamber, mortar can be efficiently spread over the entire crack with a small number of construction locations. Furthermore, since the work is performed from the combustion chamber side, the furnace wall can be repaired regardless of whether or not there is coke in the carbonization chamber. In this way, according to the present invention, the furnace wall can be repaired efficiently.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the present invention in detail, and FIG.
The figure shows raw gas leaking into the combustion chamber along cracks that have occurred in the furnace wall, and FIG. 3 shows the distribution of the cracks. 1: Carbonization chamber 2: Combustion chamber 3: Furnace wall 4: Serving section 5: Gap 6: Old mortar 7: Carbon 8: Raw gas

Claims (1)

[Claims] 1. When repairing the oven wall of a coke oven in which a plurality of carbonization chambers and combustion chambers are arranged alternately,
A method for repairing a coke oven, comprising press-fitting refractory mortar from the combustion chamber side.