JPH10183126A - Discharge of generated gas when repairing furnace wall of coke furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for discharging HCl gas stored in a carbonizing room from the carbonizing room when repairing a furnace wall of a coke furnace by SiCl4 gas. SOLUTION: HCl gas in a carbonizing room 1 generated by repair is sucked by a dust collection duct 22 of a car for storing coal by communicating the dust collection duct 22 of the car for storing the coal to the carbonizing room 1 when repairing a furnace wall of a coke furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates, at the time of the furnace walls of coke oven by supplying SiCl ₄ gas in the carbonization chamber repair, to a method for discharging the HCl gas generated in carbonization chamber.

[0002]

2. Description of the Related Art In a coke oven, a carbonization chamber for accommodating coal and a combustion chamber for generating a heating gas are alternately arranged via a furnace wall. The furnace wall is heated by the heating gas, and heat is transferred to the coal in the coking chamber through the furnace wall, which is thermally decomposed and carbonization of the coal proceeds. The resulting high-temperature coke is removed to the coke side by an extruder by removing the extrusion-side and coke-side lids on both sides of the coke oven.
Next, the next charge coal is charged from the upper charging port, and the same cycle as described above is repeated. The furnace wall wears due to the extruded coke, and repeated heating and cooling causes breakage of joints and damage to bricks. If this leads to crack damage penetrating the carbonization chamber and the combustion chamber, carbonization of the coal becomes difficult because the carbonization gas leaks from the carbonization chamber to the combustion chamber. For this reason, several repair methods have been applied.

[0003] For example, refractory powder is poured into an empty carbonization chamber by using a medium such as air or nitrogen, and a through-flow crack is closed by pneumatic transportation. There are known wet spraying methods in which a mixture of material powder and water is sprayed onto a damaged part, but these can temporarily reduce gas leakage, but the effect is not long-lasting.

[0004] Further, there is a thermal spraying method in which refractory powder is supplied into a flame composed of an oxygen-fuel gas, or is adhered to a furnace wall in a semi-molten or molten state by burning aluminum or silicon. In this thermal spraying method, the molten thermal sprayed material collides with the repaired portion and rapidly solidifies to form a thermal spray repair body mainly composed of a glass phase. This glass phase is further transferred to a crystal phase during the cooling process, but at that time, volume shrinkage occurs and cracks occur. For this reason, the thermal spray repair body is insufficiently bonded to the base material, and cannot be used for a long time. In particular, when the base material is deteriorated due to local heating due to thermal spraying and the strength is reduced, cracks are propagated from the base material side and the sprayed material falls off.

[0005] Further, when the silica bricks constituting the furnace wall are severely damaged, the damaged bricks are replaced.
Transshipments are done hot to avoid damage associated with brick cooling. However, hot repair work involves not only high-temperature heavy labor, but also a large economic loss because coke production is stopped for a long time.

As described above, the conventional method has many problems. Among the conventional methods, the thermal spraying method is excellent, and the durability of the applied thermal sprayed material is relatively excellent, but it is still insufficient. The service life is not determined only by the strength and spalling resistance of the sprayed body itself, but is about half a year due to the problem of falling off of the sprayed body as described above.

In order to solve the above-mentioned problems, the present applicant has proposed Japanese Patent Application Nos. 07-303683 and 08-109.
No. 813 proposed methods 1 and 2 for hot hearth repair. These methods will now be described with reference to FIG. 1 coking chamber, 2 a combustion chamber, 3 is composed mainly of SiO ₂ CaO _2, Al ₂ O ₃
And Fe ₂ O ₃ in total of 5 wt. %, Aperture ratio 20
% Of a silica brick brick and a joint wall mainly composed of SiO ₂ for fixing the same, and a furnace wall 5 of coal brick is a charging lid for coal. In the coke oven, a coking chamber 1 and a combustion chamber 2 are alternately connected with an oven wall 3 interposed therebetween. Fuel and air are supplied from the gas inlet 4 to the combustion chamber 2 to generate combustion gas 9. The heat of the combustion gas heats the carbonization chamber 1 via the furnace wall 3, and then from the upper opening to the heat storage chamber (not shown). Discharge. Reference numeral 6 denotes a penetrating damaged portion having an opening of 1 mm or more generated in the furnace wall 3, and 7 denotes a penetrating damaged portion having a fine opening of less than 1 mm.

Method 1 is a method suitable for repairing a penetrating damaged portion 7 having a fine opening in the above-mentioned penetrating damaged portion. A SiCl ₄ -containing gas 10 is supplied to the carbonization chamber 1 from a gas inlet 8 provided at 5. Then, the internal pressure of the carbonization chamber 1 is maintained higher than the internal pressure of the combustion chamber 2, and the internal pressure of the penetration chamber 7 is permeated. next,
The pressure inside the carbonization chamber 1 is kept lower than the pressure inside the combustion chamber 2, and the combustion gas 9 permeates into the penetration damage portion 7 from the combustion chamber 2 side.
As described above, the difference between the pressure in the carbonization chamber 1 and the pressure in the combustion chamber 2 is changed to positive or negative, so that the SiCl ₄ -containing gas 10 and the combustion gas 9 permeate the penetration damage portion 7 alternately. as a result,
SiCl ₄ gas reacts with H ₂ O (steam) in the combustion gas to produce Si
O ₂ is generated, and the penetrating damaged portion 7 is filled with the SiO ₂ to perform repair.

Method 2 is a method suitable for repairing a penetrating damaged portion 6 having a relatively large opening in the above-mentioned penetrating damaged portion. Then, an inorganic oxide powder such as MgO, CaO, ZrO ₂ or the like is transported by airflow, and penetrates into the penetrated damage portion 6 to form a packed body of the inorganic oxide powder. Next, a SiCl ₄ -containing gas 10 was supplied to the coking chamber 3 from the gas inlet 8 provided in the charging lid 5, the pressure in the coking chamber 1 was kept higher than the pressure in the combustion chamber 2, and the penetrating damaged portion 6 was filled. SiCl ₄ containing gas 10 between inorganic oxide powder particles
Infiltrate. The inorganic oxide powder is reacted with the SiCl ₄ -containing gas 10 to generate SiO ₂ and chloride. Next, the internal pressure of the carbonization chamber 1 is maintained lower than the internal pressure of the combustion chamber 2, and the combustion gas 9 permeates the filler of the penetration damaged portion 6 from the combustion chamber 2 side. H ₂ O (steam) in the combustion gas 9 reacts with chloride by-produced in the packing to generate non-SiO ₂ oxide. As described above, by changing the difference between the pressure in the carbonization chamber 1 and the pressure in the combustion chamber 2 to positive or negative, the SiCl ₄ -containing gas 10 and the combustion gas 9 are alternately permeated into the filling material of the penetration damage portion 6. As a result, oxides of SiO ₂ and non-SiO ₂ are generated in the filling body of the penetrating damaged portion 6, the density of the filling body is improved, and repair is performed.

[0010]

However, in the above methods 1 and 2, the SiCl ₄ -containing gas and the H ₂ O
When (steam) reacts to precipitate SiO ₂ , HCl gas is generated and accumulates in the carbonization chamber. This HCl gas must be exhausted because it corrodes the bricks and hinders operation.

An object of the present invention is to provide a method for discharging HCl gas accumulated in a coking chamber from a coking chamber when repairing a furnace wall with SiCl ₄ gas.

[0012]

SUMMARY OF THE INVENTION The present invention is the above-mentioned object, when repairing furnace walls of coke oven by SiCl ₄ gas, communicates the carbonization chamber and instrumentation Tansha dust duct, carbonizing chamber HCl gas generated by repair This is achieved by a method of discharging generated gas at the time of repairing the furnace wall of a coke oven in which air is sucked into a dust collection duct of a coal-carrying truck.

[Operation] By making the dust collection duct of the coal-equipped vehicle communicate with the carbonization chamber, gas in the carbonization chamber is sucked and discharged to the dust collection duct. At this time, if the rim damper is closed, it is possible to prevent a reduction in the calorific value of the carbonization gas, that is, the coke oven gas, which is discharged from another coking chamber to the dry main.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram of the method of the present invention. 1 is a carbonization chamber, 5 is a charging lid, 11 is a rising pipe, 12 is a bent pipe, 13 is a bevel damper, and 14 is a dry main. The gas during carbonization passes from the carbonization chamber 1 through the riser pipe 11, the bend pipe 12, and the edge cut damper (open) to form the dry main body 1.
Suctioned and discharged at 4.

Reference numeral 22 denotes a dust collection duct of a coal-equipped truck, reference numeral 20 denotes a suction pipe communicating between the carbonization chamber 1 and the dust collection duct 22, reference numeral 21 denotes a valve provided in the middle of the suction pipe 20, and reference numeral 23 denotes a suction pipe. It is an air ejector that uses compressed air. The suction pipe 20 and the valve 21 are provided for each carbonization chamber.

Reference numeral 15 denotes a SiCl ₄ gas generator, 16 denotes a gas blower, and 17 denotes a pipe. The SiCl ₄ gas is supplied to the gas blower 16.
To the carbonization chamber 1.

Next, the method of the present invention will be described. (1) After the carbonization chamber is emptied, a SiCl ₄ gas is supplied to the carbonization chamber 1 to repair the furnace wall. During this furnace wall repair, SiCl ₄
HCl gas accumulates in the carbonization chamber due to the reaction between the gas and the steam in the combustion gas. (2) If the rim cutting damper 13 is closed and the valve 21 is opened,
The dust collection duct 22 of the coal-equipped vehicle communicates with the carbonization chamber 1,
The gas containing HCl is sucked into the dust collecting duct 22 and discharged. If the air ejector 23 is used together, the gas in the carbonization chamber can be discharged in a short time. At the same time, by opening the edging damper 13 and allowing the dry main 14 to suck the gas in the carbonization chamber, the gas can be discharged in a shorter time. In addition, also in the case of using the edge cutting damper, it is possible to suppress a decrease in the calories of the coke oven gas.

[0018]

According to the present invention, since the gas in the carbonization chamber is sucked into the dust collection duct of the coal-equipped vehicle, the gas in the carbonization chamber containing the HCl gas can be discharged without reducing the calories of the coke oven gas. it can.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of the method of the present invention.

FIG. 2 is a schematic diagram illustrating a furnace wall repair method using SiCl ₄ gas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbonization room 5 Charging lid 11 Rise pipe 12 Curved pipe 13 Edge cut damper 14 Dry main 20 Suction pipe 21 Valve 22 Dust collection duct for coal-carrying vehicles 23 Air ejector

Claims (1)

[Claims] When a furnace wall of a coke oven is repaired with SiCl ₄ gas, a dust collection duct for a charcoal car is communicated with a carbonization chamber, and HCl gas generated in the repair is sucked into the dust collection duct for a charcoal car. Outgassing method for repairing coke oven walls.