JPH10183131A - Change of pressure in furnace of coke furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for changing a pressure in a furnace of a coke furnace for promoting a precipitation of SiO2 when repairing a furnace wall of the coke furnace by a gas containing SiCl4 . SOLUTION: A pressure in a combustion room is changed alternatively to negative and positive pressures after stopping the combustion in the combustion room 2 concerning with the repair of a furnace wall 3 by opening a waste valve 32 of the combustion room 2, forming the combustion room 2 into the negative pressure by communicating the combustion room to a flue 33, further closing the waste valve 32, blowing steam through a C gas-charging pipe 40 to the combustion room 2 to form the combustion room 2 into the positive pressure in the method for changing a pressure in a furnace of a coke furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates is the through damaged portion of the furnace wall of a coke oven to penetrate the SiCl ₄ containing gas from the coking chamber side, or, together to penetrate the SiCl ₄ containing gas from the carbonization chamber side, a combustion chamber by entering the combustion gas containing steam from the side, the through damaged portion when repairing the furnace inner wall by precipitating SiO _2, relates furnace pressure fluctuations method coke oven for promoting deposition of SiO ₂ It is.

[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. Here, the furnace wall is usually made of silica brick. The thickness is 50-150 mm. The resulting high-temperature coke is removed from the extruder on both sides of the coke oven and the lid on the guide wheel side, and is discharged to the guide wheel side by an extruder. 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, a method is known in which a refractory powder is poured into an empty carbonization chamber by using a medium such as air or nitrogen and the through crack is closed by pneumatic transportation. As a method of repairing the furnace wall near the furnace lid, there is known a wet spraying method in which a mixture of refractory powder and water is sprayed on a damaged portion.However, these methods can temporarily reduce gas leakage. Yes, 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 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 develop 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. Is not determined only by the strength and spalling resistance of the sprayed body itself, and the service life is about half a year due to the problem of falling off of the sprayed body as described above.

The furnace walls of the coke oven and the combustion chamber of the coke oven are:
It is desirable that there be no cracks penetrating from the carbonization chamber to the combustion chamber and that a smooth wall surface be maintained. Therefore, it is important to improve the strength and wear resistance of the furnace wall. If a through crack occurs in the furnace wall, the damaged wall must be replaced or repaired by thermal spraying. As mentioned above, replacing the damaged area requires a long shutdown of the device. In a facility such as a coke oven where it is practically impossible to cool the oven to protect the oven wall, there is also the problem that the oven wall must be exchanged hot.

[0008] The present applicant has solved the above-mentioned problem.
Japanese Patent Application Nos. 07-303683 and 08-109
No. 813 proposed methods 1 and 2. These methods
This will be described next with reference to FIG. 1 is a carbonization chamber, 2 is a combustion chamber, 3
Is SiO_TwoWith CaO as the main component_Two, Al _TwoO_ThreeAnd Fe_TwoO_ThreeIn total
5 wt. %, With an opening ratio of about 20%
SiO fixing it_TwoComposed of silica-based joints
The furnace wall 5 of the brick is a lid for charging coal. Coke oven charcoal
Chamber 1 and combustion chamber 2 are connected alternately with furnace wall 3 in between
You. Fuel and air are supplied from the gas inlet 4 to the combustion chamber 2,
The combustion gas 9 is generated, and the furnace wall 3 is heated by the heat of the combustion gas.
Not shown after heating the carbonization chamber 1 through the upper opening
Discharge to the heat storage room. 6 is 1 mm or more generated on the furnace wall 3
Penetration damaged part with opening, 7 is fine opening less than 1 mm
It is a penetration damage part having a mouth.

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 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.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a penetrating damaged portion generated in a furnace wall of a coke oven is alternately infiltrated with a SiCl ₄ -containing gas and water vapor, and the penetrating damaged portion is repaired by the above method 1 or 2. To provide a method of fluctuating the pressure in a coke oven for coke.

[0012]

The present invention achieves the above object by the following method.

In the first method, after the combustion in the combustion chamber related to the repair of the furnace wall is stopped, the waist valve of the combustion chamber is opened, the combustion chamber is communicated with the flue, and the pressure in the combustion chamber is reduced. A coke oven that closes the waist valve, blows steam into the combustion chamber through a C gas supply pipe, and pressurizes the combustion chamber to alternately change the pressure of the combustion chamber to negative pressure and positive pressure. This is the method of fluctuating the pressure in the furnace. Here, C gas is coke gas.

In the second method, a gas supply / exhaust device including a blower, a piping system, and a plurality of valves for switching a piping system is used after the carbonization chamber for repairing the furnace wall is emptied and then closed. First, the piping system is set to a gas supply state by opening and closing the plurality of valves, gas is supplied to the carbonization chamber to make the carbonization chamber positive pressure, and then, the opening and closing of the plurality of valves is changed to discharge the gas from the piping system. This is a coke oven pressure fluctuation method in which the pressure in the coking chamber is alternately changed to a negative pressure and a positive pressure by setting a state and discharging the gas in the coking chamber to make the coking chamber a negative pressure.

[0015] A third method is to empty the carbonization chamber for repairing the furnace wall, then close the chamber, and supply a gas to the carbonization chamber with a blower to make the carbonization chamber positive pressure. This is a method for fluctuating the pressure in the coke oven alternately between the negative pressure and the positive pressure by making the pressure in the coking chamber alternately negative and positive by communicating with the guide vehicle dust collection duct.

In the fourth method, the carbonization chamber for repairing the furnace wall is emptied and then closed, and the carbonization chamber is supplied with air by a suction / exhaust device comprising a cylinder and a piston, and the carbonization chamber is set to a positive pressure. Then, the gas in the coking chamber is sucked by the suction / exhaust device, and the pressure in the coking chamber is alternately changed to a positive pressure and a negative pressure by setting the coking chamber to a negative pressure. This is a furnace pressure fluctuation method.

[Operation] First method: When the waist valve of the combustion chamber is opened and the combustion chamber is communicated with the flue, the gas in the combustion chamber is sucked into the flue and the combustion chamber becomes negative pressure. When the waist valve of the combustion chamber is closed, the suction of the gas in the combustion chamber is stopped. In this state, when steam is blown into the combustion chamber from the C gas supply pipe, the steam expands due to the high temperature atmosphere in the combustion chamber, and the combustion chamber becomes positive pressure. By repeating this alternately, the difference between the pressure in the combustion chamber and the pressure in the carbonization chamber can be changed positively and negatively alternately.

Second method: When the piping system is set to a gas supply state by opening and closing a valve, and gas is supplied to the coking chamber by a blower, the pressure in the coking chamber becomes positive. Next, by changing the opening and closing of the valve so that the piping system is in a gas discharging state and the gas is exhausted from the carbonizing chamber by the blower, the pressure in the carbonizing chamber becomes negative. By repeating this alternately, the difference between the pressure in the combustion chamber and the pressure in the carbonization chamber can be changed positively and negatively alternately.

Third method: When gas is supplied to the coking chamber by a blower, the pressure in the coking chamber becomes positive. Next, when the carbonization chamber communicates with the guide vehicle dust collection duct, gas in the carbonization chamber is sucked into the dust collection duct, and the pressure in the carbonization chamber becomes negative. By repeating this alternately, the difference between the pressure in the combustion chamber and the pressure in the carbonization chamber can be changed positively and negatively alternately.

Fourth method: When the gas in the cylinder is supplied to the carbonization chamber by moving the piston of the intake / exhaust device forward, the carbonization chamber becomes positive pressure. Next, when the gas in the carbonization chamber is sucked into the cylinder by retracting the piston of the intake and exhaust device, the pressure in the carbonization chamber becomes negative. By repeating this alternately, the difference between the pressure in the combustion chamber and the pressure in the carbonization chamber can be changed positively and negatively alternately.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

An embodiment of the first method will be described next with reference to FIG. FIG. 1 is an explanatory diagram of a first method of the present invention. This figure shows both the cross section of the combustion chamber and the cross section of the carbonization chamber together. The combustion chamber 2 is divided into a plurality of sections 21, and a partition wall 22 is provided upright from the bottom of the combustion chamber at the center of the section 21, and an opening is formed between the upper end thereof and the ceiling of the combustion chamber 2. ing. The combustion gas 9 generated by the combustion of the fuel such as the C gas in one of the sections 21 rises on one side of the partition wall 22, reverses at the upper opening, and descends on the other side of the partition wall 22, and the heat storage chamber 30 → Sole flue 31 is sucked into the flue 33 via the waist valve 32. On the other hand, a C gas supply pipe 40 is provided below the combustion chamber 2, and a plurality of branch pipes 41 are erected on the C gas supply pipe 40, and the upper end of the branch pipe 41 is located at the bottom of the section 21. It is protruding. Then, C gas is supplied to each section 21 of the combustion chamber via the branch pipe 41. In order to carry out this method, a steam supply pipe 42 is connected to a C gas supply pipe 40, and a valve 43 is provided on the way.

The first method is performed as follows. (1) The coking chamber 1 for repairing the furnace wall is an empty kiln, the furnace lids on both sides of the coking chamber 1, the charging lid 5 of the coal charging port 11 are closed, and the riser pipe 12 and the dry main 14 communicating with the coking chamber 1. The water seal valve 13 for shutting off the gas flow during the period is closed. At this time, the combustion in the combustion chambers 2 on both sides of the carbonization chamber 1 is stopped, and the waist valve 32 is closed. (2) The gas release valve 15 at the top of the riser pipe 12 is opened, and a SiCl ₄ -containing gas is supplied into the carbonization chamber 1 from a supply pipe (not shown) provided in the charging lid 5 to replace the air in the carbonization chamber 1. Then, the gas release valve 15 and a valve (not shown) of the SiCl ₄ -containing gas supply pipe are closed, and the carbonization chamber 1 is closed. (3) Open the waist valve 32. The gas in the combustion chamber 2 is sucked into the flue 33 via the heat storage chamber 30 → the sole flute 31 → the waist valve 32, and the inside of the combustion chamber 1 is about −2.
0 mmAq. This state is continued for a fixed time. (4) With the waist valve closed, the valve 43 of the steam supply pipe 42 is opened, and steam is supplied into the combustion chamber 1 through the C gas supply pipe 40 → the branch pipe 41.
When the pressure reaches about +50 mmAq, this pressure state is maintained for a certain period of time, and then the supply of steam is stopped. (5) The above (3) and (4) are repeated a fixed number of times.

An embodiment of the second method will be described next with reference to FIG. FIG. 2 is an explanatory diagram of the second method of the present invention. In this figure, the carbonization chamber 1 is shown in a sectional view. 50 is a blower provided on the furnace top, 51 is a suction pipe, 52 is a valve provided in the middle of the suction pipe 51, 53 is a gas generator, 54 is a gas supply pipe, and 55 is provided in the middle of the gas supply pipe. It is a valve. 56 is a first discharge pipe, 57 is a valve provided in the middle of the first discharge pipe, and 58 is a first discharge pipe 5 below the valve 57.
A second discharge pipe branched from 6, 59 is a second discharge pipe 58.
The tip of the second discharge pipe 58 protrudes into the carbonization chamber 1 through the charging lid 5. In addition, the fluctuation range of the internal pressure of the carbonization chamber 1 needs to be −40 to +40 mmAq because the water level of the water seal valve 13 is 50 mm.

The second method is performed as follows. (1) The coking chamber 1 for repairing the furnace wall is an empty kiln, the furnace lids on both sides of the coking chamber 1, the charging lid 5 of the coal charging port 11 are closed, and the riser pipe 12 and the dry main 14 communicating with the coking chamber 1. The water seal valve 13 for shutting off the gas flow during the period is closed. (2) The valves 52 and 57 are closed, the valves 55 and 59 are opened, the gas release valve 12 is opened, and the blower 50 is operated to operate the gas generator 53.
The in generated SiCl ₄ containing gas, a gas supply pipe 54 → the suction pipe 51 → the blower 50 → first discharge pipe 56 → via the second discharge pipe is supplied to the carbonization chamber 1, substitution with air carbonization chamber I do. When the replacement is completed, the gas release valve 15 is closed and the carbonization chamber 1
Is closed. (3) The blower 50 is operated, and the internal pressure of the carbonization chamber 1 is increased by +40.
When the pressure reaches mmAq, the operation of the blower is stopped, and this state is continued for a certain time. (4) The valves 55 and 59 are closed, the valves 52 and 57 are opened, the blower 50 is operated, and the gas in the carbonization chamber 1 is discharged to the second discharge pipe 58.
→ Suction pipe 51 → Blower 50 → Dissipates to the atmosphere via first discharge pipe 56. When the internal pressure of carbonization chamber 1 becomes −40 mmAq, operation of blower 50 is stopped and this state is continued for a certain period of time. (5) The above (3) and (4) are repeated a fixed number of times.

An embodiment of the third method will now be described with reference to FIG. FIG. 3 is an explanatory diagram of the third method of the present invention. In this figure, the carbonization chamber 1 is shown in a sectional view. Reference numeral 60 denotes a blower, 53 denotes a gas generator, 54 denotes a suction pipe, 61 denotes a discharge pipe, and 62 denotes a valve provided in the discharge pipe 61. The distal end of the discharge pipe 61 protrudes into the carbonization chamber 1 through the charging lid 5. 63 is a guide car dust collecting duct, 64 is a suction branch pipe attached to the dust collecting duct 63, 65 is a valve provided in the middle of the suction branch pipe 64, and 66 is a pipe flanged to the suction branch pipe 64. . The tip of the pipe 66 projects into the carbonization chamber 1 through the charging lid 5.

The third method is performed as follows. (1) The coking chamber 1 for repairing the furnace wall is an empty kiln, the furnace lids on both sides of the coking chamber 1, the charging lid 5 of the coal charging port 11 are closed, and the riser pipe 12 and the dry main 14 communicating with the coking chamber 1. The water seal valve 13 for shutting off the gas flow during the period is closed. (2) Open the valve 62 and open the gas release valve 15 to
In operation 0, the SiCl ₄ -containing gas generated by the gas generator 53 is supplied to the carbonization chamber 1 via the suction pipe 54 → the blower 60 → the discharge pipe 61 to replace the air in the carbonization chamber. When the replacement is completed, the gas release valve 15 is closed, and the carbonization chamber 1 is closed. (3) The blower 60 is operated, and the internal pressure of the carbonization chamber 1 is +40 m.
When mAq is reached, the operation of the blower 60 is stopped, and this state is continued for a certain period of time. (4) Open the valve 65 and supply the gas in the carbonization chamber 1 to the pipe 66 →
The suction is performed through the suction branch pipe 64 → the dust collection duct 63, and when the internal pressure of the carbonization chamber 1 becomes −40 mmAq, the valve 65 is closed, and this state is continued for a certain time. (5) The above (3) and (4) are repeated a fixed number of times.

An embodiment of the fourth method will be described next with reference to FIG. FIG. 4 is an explanatory diagram of the fourth method of the present invention. In this figure, the carbonization chamber 1 is shown in a sectional view.
The intake / exhaust device 70 is composed of a cylinder 71 and a piston 73, in which gas is sucked into the cylinder 71 by retracting the piston 73, and exhausted in the cylinder 71 by moving the piston 73 forward. It is. Reference numeral 72 denotes an intake / exhaust port provided at the rear end of the cylinder 71, and reference numeral 75 denotes an intake / exhaust pipe connected to the front end of the cylinder 71, the tip of which protrudes into the carbonization chamber 1 through the charging lid 5. A cylinder rod 74 is connected to a reciprocating device (not shown).

The fourth method is performed as follows. (1) The coking chamber 1 for repairing the furnace wall is an empty kiln, the furnace lids on both sides of the coking chamber 1, the charging lid 5 of the coal charging port 11 are closed, and the riser pipe 12 and the dry main 14 communicating with the coking chamber 1. The water seal valve 13 for shutting off the gas flow during the period is closed. (2) The gas release valve 15 is opened, and a SiCl ₄ -containing gas is supplied to the coking chamber 1 by a gas supply device (not shown).
Replace with air inside. When the replacement is completed, gas release valve 15
Is closed to put the carbonization chamber 1 in a sealed state. (3) The piston 73 of the intake / exhaust device 70 is advanced to supply the gas in the cylinder 71 to the coking chamber 1, and when the internal pressure of the coking chamber 1 becomes +40 mmAq, the supply is stopped, and this state is continued for a certain time. (4) The piston 73 of the intake / exhaust device 70 is retracted to suck the gas in the carbonization chamber 1 into the cylinder 71. When the internal pressure of the carbonization chamber 1 becomes −40 mmAq, the suction is stopped, and this state is maintained for a certain period of time. continue. (5) The above (3) and (4) are repeated a fixed number of times.

[0030]

According to the method of the present invention, the pressure in the combustion chamber or the pressure in the carbonization chamber can be changed alternately between positive and negative pressures. As a result, the SiCl
_{(4) The} vapor containing gas can permeate the vapor from the combustion chamber side to promote the filling of the penetration damage portion with SiO ₂ .

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a second method of the present invention.

FIG. 3 is an explanatory diagram of a third method of the present invention.

FIG. 4 is an explanatory diagram of a fourth method of the present invention.

FIG. 5 is an explanatory diagram of furnace wall repair of a coke oven using a SiCl ₄ -containing gas and steam in a combustion gas.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbonization chamber 2 Combustion chamber 3 Furnace wall 5 Charging lid 6, 7 Penetration damaged part 12 Rise pipe 13 Water seal valve 14 Dry main 15 Gas release valve 32 West valve 33 Flue 40 C gas supply pipe 42 Steam supply pipe 50 Blower 51, 54, 56, 58 Piping system 52, 55, 57, 58 Valve 53 Gas generator 60 Blower 63 Dust collection duct 70 Suction and exhaust device 71 Cylinder 73 Piston 74 Cylinder rod 75 Suction and exhaust pipe

Claims (4)

[Claims] After stopping combustion in a combustion chamber related to repair of a furnace wall, a waist valve of the combustion chamber is opened, the combustion chamber is connected to a flue, and a pressure in the combustion chamber is reduced. Coke characterized in that the valve is closed, steam is blown into the combustion chamber via a C gas supply pipe, and the pressure in the combustion chamber is alternately changed to negative pressure and positive pressure by making the combustion chamber positive pressure. How to change the pressure inside the furnace. 2. After emptying the carbonization chamber for repairing the furnace wall,
Using a gas supply / exhaust device comprising a plurality of valves for switching between a blower, a piping system and a piping system in a closed state, first, the piping system is brought into a gas supply state by opening and closing the plurality of valves, and the gas is supplied to the carbonization chamber. To a positive pressure in the carbonization chamber, and then change the opening and closing of the plurality of valves to bring the piping system into a gas discharge state, and discharge the gas in the carbonization chamber to make the carbonization chamber a negative pressure, thereby reducing the pressure in the carbonization chamber. A method for fluctuating pressure in a coke oven, wherein the pressure is fluctuated alternately between negative pressure and positive pressure. 3. After emptying the carbonization chamber for repairing the furnace wall,
In a closed state, gas is supplied to the carbonization chamber by a blower to make the carbonization chamber positive pressure, and then the carbonization chamber is communicated with the guide vehicle dust collecting duct to make it negative pressure, thereby reducing the pressure of the carbonization chamber to negative pressure. Pressure fluctuation method for a coke oven characterized by alternately fluctuating pressure and positive pressure. 4. After emptying the carbonization chamber for repairing the furnace wall,
In a closed state, air is supplied to the carbonization chamber by a suction and exhaust device including a cylinder and a piston, the carbonization chamber is set to a positive pressure, and then the gas in the carbonization chamber is suctioned by the suction and exhaust device.
A method of fluctuating pressure in a coke oven, wherein the pressure of the coking chamber is alternately changed to a positive pressure and a negative pressure by setting the coking chamber to a negative pressure.