JPH10140162A - Method and apparatus for preventing leak of gas from coking chamber of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent coking coal from dusting when it is fed into a coking chamber and to prevent the leak of gas in the initial stage of carbonization. SOLUTION: In the stage of successively feeding coking coal into many coking chambers 1 and in the initial stage of carbonization, the pressure of ammonia water fed into a spray nozzle is regulated to high and middle pressures by the control of the revolution speed of a high/middle pressure ammonia water pump driven by a VVVF motor 17, while a low-pressure use ammonia water pump 13 is being operated by a general purpose motor 14 during the period from the time after the initial stage of carbonization to the time of coke pushing subsequent to the completion of carbonization to feed low-pressure ammonia water into a spray nozzle 7. Because the number of pumps necessary to feed ammonia water can be decreased from three (in a conventional process) to two, the equipment cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spray nozzle provided at a bend portion of each riser pipe connecting a plurality of coking chambers arranged in a coke oven and a collecting main pipe, and charging coal into each coking chamber during a period of charging coal. To supply high-pressure low-temperature water and supply medium-pressure low-pressure water during the early stage of dry distillation after coal charging is completed to prevent gas leakage in the carbonization chamber. The present invention relates to an improvement in a method and a device for preventing gas leakage in a coking chamber in a coke oven that cools generated gas by supplying low-pressure water.

[0002]

2. Description of the Related Art In a coke oven, a large number of carbonization chambers and combustion chambers are alternately arranged, and coal is charged into each of the carbonization chambers sequentially from a plurality of charging ports disposed on a longitudinal ceiling thereof. .
The coal-filled bed charged in each coking chamber is carbonized by indirect heating from both sides through the furnace wall brick from the adjacent combustion chamber. The carbonization gas generated in the carbonization chamber during the carbonization time passes through the upper space of the coal packed bed, and is discharged to the collecting main pipe via the bend of the riser provided at the furnace top on the coke extrusion side.

[0003] Usually, 80 generated in the carbonization chamber during carbonization of coal is used.
Low-pressure water (ammonia water) is blown out from a spray nozzle provided at the bend of the riser at about 0 ° C.
Cooled down to about ° C. As a measure to reduce the leakage of gas and dust from the hood covering the vicinity of the charging port when charging coal that opens the charging port arranged in the carbonization chamber, it is sprayed from the spray nozzle provided at the bend of the riser. The low-pressure low-pressure water is switched to high-pressure low-pressure water, and the leakage is prevented by sucking dry distillation gas and dust into the riser pipe by the ejector effect.

On the other hand, the amount of gas generated during the carbonization of coal in the carbonization chamber is large at the beginning of carbonization, gradually decreases with the elapse of carbonization time, and becomes extremely small at the end of carbonization. Therefore, in the early stage of dry distillation where a large amount of gas is generated, gas leaks from the periphery of the furnace lid, and gas leakage cannot be sufficiently prevented only with the seal between the furnace lid and the furnace frame, which has been a pollution problem. . In order to solve this problem, at the beginning of dry distillation where the amount of gas generated from the coal charged into the carbonization chamber is large, medium-pressure low-pressure water is ejected from the spray nozzle provided at the bend of the riser, and the gas is ejected by the ejector effect. A technique for enhancing gas suction to prevent gas leakage is known (see Japanese Patent Publication No. Sho 51-28281 and Japanese Patent Laid-Open Publication No. Sho 55-106286).

[0005] Many coke ovens have been in operation for many years since they were constructed, and the furnace body is aging. In particular, the furnace wall brick that separates the carbonization chamber and combustion chamber is repeatedly exposed to a high temperature of 1000 ° C or more, so that it is not only damaged by high-temperature substances but also cracks and erosion due to repeated expansion and contraction. Causes damage. As the damage to the furnace wall brick in the coking chamber progresses, it communicates with the adjacent combustion chamber, and part of the carbonization gas generated in the coking chamber leaks into the combustion chamber. The amount of carbonization gas leaking from the carbonization chamber to the combustion chamber concentrates in the early stage of carbonization where the amount of gas generated in the carbonization chamber is large.

[0006] A plurality of burners are arranged in the combustion chamber in the longitudinal direction. Fuel gas and air preheated in the heat storage chamber are supplied to these burners, and are burned at a constant excess air rate. In the early stage of carbonization, the amount of carbonized gas leaking from the carbonization chamber to the combustion chamber increases, so the fuel gas in the combustion chamber increases,
The air rate decreases, causing incomplete combustion. If the incomplete combustion in the combustion chamber becomes remarkable, black smoke is generated from the chimney of the coke oven which guides the exhaust gas of the combustion chamber, causing pollution.

In the early stage of the dry distillation, a medium-pressure low-pressure water is ejected from a spray nozzle provided at a bend portion of the riser, and a large amount of the dry distillation gas generated in the carbonization chamber by the ejector effect is forcibly sucked into the riser. The method is also effective in reducing the amount of carbonized gas leaking from the carbonization chamber to the combustion chamber through a damaged portion generated in the furnace wall brick.

[0008]

In the above prior art, a large number of coking chambers 1 arranged in a coke oven as shown in FIG.
The carbonization gas generated by the carbonization of the coal-filled bed 2 charged in the inside is bent at the bend portion 4 of the riser 3 provided at the top of the carbonization chamber 1.
Through the damper 5 whose opening has been adjusted.
Is discharged. The bend portion 4 is provided with a spray nozzle 7 directed downward, and the spray nozzle 7 is provided with three-way switching cocks 8 and 9 for high-pressure and low-pressure water pipe 10, medium-pressure and low-pressure water pipe 11, and low-pressure and low-pressure water pipe. 12 are connected respectively. When charging coal into the coking chamber 1, the three-way switching cock 8 is connected to the high-pressure water supply pipe 10, high-pressure water is injected from the spray nozzle 7, and the gas rising in the riser 3 by the ejector effect. Is forcibly sucked into the collecting main pipe 6.

After the charging of the coal is completed, the three-way switching cocks 8 and 9 are switched, and the medium-pressure low-pressure water pipe 11 is connected to the spray nozzle 7 to discharge the medium-pressure low-pressure water. Initially, a large amount of dry distillation gas generated from the coal packed bed 2 in the coking chamber 1 is forcibly sucked into the collecting main pipe 6,
Gas is prevented from leaking from the carbonization chamber 1. If the early stage of the carbonization elapses and the generation of the carbonization gas decreases, the pressure in the carbonization chamber 1 decreases, and conversely, there is a risk that air may enter the carbonization chamber 1. Then, the three-way switching cock 9 is switched at an appropriate timing, the low-pressure low-pressure water pipe 12 is connected to the spray nozzle 7, and the low-pressure low-pressure water jetted from the spray nozzle 7 causes the dry distillation passing through the bend portion 4 of the riser pipe 3. Cool the gas.

In this case, high-pressure low-pressure water, medium-pressure low-pressure water and low-pressure low-pressure water are supplied to the high-pressure low-pressure water pipe 10, the medium-pressure low-pressure water pipe 11, and the low-pressure low-pressure water pipe 12, respectively. It is necessary to install pumps for low-pressure, medium-pressure and low-pressure water. For this reason, three water pumps are required, and the pump body and its auxiliary equipment are required, so that there is a problem that the equipment cost increases and the cost increases. The present invention reduces the equipment cost by reducing the number of installed water pumps, and furthermore, when having existing high-pressure water pumps and low-pressure water pumps, it is inexpensive and easy by simple modification. It is an object of the present invention to provide a method and an apparatus for preventing gas leakage in a coking chamber in a coke oven applicable to a coke oven.

[0011]

According to a first aspect of the present invention, there is provided a method of manufacturing a coke oven comprising: a plurality of coking chambers arranged in a coke oven; Supply high-pressure low-temperature water to the spray nozzles during the charging period of coal into each carbonization chamber, and supply medium-pressure low-pressure water during the initial period of dry distillation after coal charging is completed to prevent gas leakage in the carbonization chamber and dry distillation. In a method of preventing gas leakage from a carbonization chamber in a coke oven in which low-pressure water is supplied to cool generated gas during a period from the initial lapse to the coke extrusion accompanying the completion of dry distillation, a high- and medium-pressure common safety driven by a VVVF motor is used. In addition to installing a water pump, a dedicated pump for low-pressure water supply using a general-purpose motor will be installed. Speed control Adjust the pressure of the low-pressure water supplied to the spray nozzle to a high pressure, and supply it to the spray nozzle by controlling the rotation speed of the high-to-medium pressure low-pressure common water pump by the VVVF motor in the early stage of carbonization after the coal charging into each carbonization chamber is completed. While the pressure of low-pressure water is adjusted to medium pressure, low-pressure low-pressure water is supplied to the spray nozzle by driving a low-pressure low-pressure water-only pump by a general-purpose motor during the period from the beginning of dry distillation to the coke extrusion following completion of dry distillation. A method for preventing gas leakage from a coking chamber in a coke oven.

The present invention according to claim 2 is a method for controlling the rotation speed of a high-to-medium pressure common-use water pump by a VVVF motor during a coal charging period in which coal is sequentially charged into the plurality of coking chambers. The pressure of the low-pressure water supplied to the spray nozzle corresponding to the carbonization chamber during coal charging is adjusted to a high pressure, and the spray corresponding to the other carbonization chamber in the early stage of carbonization after the completion of coal charging during the charging period. 2. A method for preventing gas leakage in a coking furnace in a coke oven according to claim 1, wherein high-pressure water is supplied to the nozzle temporarily from a high-pressure water pump exclusively for the coal charging period.

According to a third aspect of the present invention, when the number of rotations of the high-to-medium pressure and common water pump is controlled by the VVVF motor during the coal charging period in which coal is sequentially charged into the plurality of carbonization chambers, The pressure of the low-pressure water supplied to the spray nozzle corresponding to the carbonization chamber during coal charging is adjusted to a high pressure, and the spray corresponding to the other carbonization chamber in the early stage of carbonization after the completion of coal charging during the charging period. 2. The method according to claim 1, wherein the low-pressure low-pressure water is temporarily supplied to the nozzle from a low-pressure low-pressure water pump corresponding to the coal charging period.

According to a fourth aspect of the present invention, the high / medium pressure and common water pump is set to have a predetermined rotation speed corresponding to the number of kilns at the initial stage of the dry distillation after the completion of charging the coal into each of the coking chambers. 4. A method for preventing gas leakage from a coking chamber in a coke oven according to claim 1, wherein the pressure of the low-temperature water supplied to the spray nozzle is adjusted to a medium pressure by controlling using a VVVF motor. It is.

According to a fifth aspect of the present invention, the high / medium pressure common-use water pump has a preset rotation speed corresponding to the number of kilns in a charging period in which coal is sequentially charged into each of the coking chambers. 5. A gas leak in a coking oven in a coke oven according to claim 1, wherein the pressure of the low-pressure water supplied to the spray nozzle is adjusted to a high pressure by controlling using a VVVF motor. It is a prevention method.

According to a sixth aspect of the present invention, there is provided a spray nozzle provided at a bend portion of each riser pipe connecting a plurality of coking chambers arranged in a coke oven and a collecting main pipe, and charging coal into each coking chamber. Supply high-pressure low-temperature water at times and supply medium-pressure low-pressure water during the early stage of dry distillation after coal charging is completed to prevent gas leakage in the carbonization chamber.
In a coke oven gas leak prevention device that cools the generated gas by supplying low-pressure water during the period from subsequent dry distillation to coke extrusion, high-medium pressure that supplies high-pressure and medium-pressure water to each spray nozzle A common water supply pump, a VVVF motor for operating this high / medium pressure common water pump by controlling the number of revolutions, a special pump for supplying low pressure water to each spray nozzle, and a dedicated pump for low pressure water A gas leakage prevention device for a coke oven in a coke oven, comprising: a general-purpose motor; and a three-way cock for selectively switching between high- and low-pressure water and low-pressure water to each spray nozzle.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. Of the many coking chambers arranged in the coke oven, for example, as shown in FIG. 1, when coal is charged into the coking chamber 1 of kiln No. 1, then the fifth kiln no. Coal is charged into the carbonization chamber 1 of No. 6, and the furnace number N
o.11, kiln No.16, kiln No.21, kiln No.26 ... 5 counting from the side of the carbonization chamber 1 where coal is being charged.
Coal is charged at every second kiln turn, and carbonized coke is discharged according to this order to maintain stable coke oven operation.

The carbonization gas generated by carbonization of the coal packed bed 2 charged in the carbonization chamber 1 passes from the rising pipe 3 provided at the top of each carbonization chamber 1 via the bend section 4 to the collecting main pipe 6. (See FIG. 6). A spray nozzle 7 is provided downward at the bend portion 4 of each riser pipe 3, and each spray nozzle 7 has a low-pressure and low-pressure water supply pipe 12 and a high and medium pressure branching from the low-pressure and low water supply pipe 12 at a branch point A. Water pipe 15
Are connected via a three-way switching cock 8.

Low pressure water supply piping upstream of branch point A
The pump 12 is provided with a pump 13 dedicated to low-pressure water supply. The pump 13 dedicated to low-pressure water supply is driven by a general-purpose motor 14. A common high-pressure / medium-pressure water pump 16 is provided in the water pipe 15.
A VVF (Variable Voltage Variable Frequency) motor 17 is used to drive the motor so that the rotation speed can be changed. Each spray nozzle 7 has
The pipes are connected to a low-pressure and low-pressure water supply pipe 12 and a high and medium-pressure and low-pressure water supply pipe 15 through respective three-way switching cocks 8. Switching of the three-way switching cock 8 is performed by sequence control set in the controller 19. The pressure adjustment between the high-pressure and medium-pressure water supplied from the high- and medium-pressure water supply common pump 16 is performed by the sequence control set in the controller 19 while measuring the pressure with the pressure gauge 18 provided at the pump outlet. Done.

Next, the operation of the present invention will be described. The present invention uses a VVVF motor 17 to provide a high-to-medium pressure
The variable-speed operation of the nozzle 16 supplies the spray nozzle 7 with high-pressure water and medium-pressure water.

[0021]

[Table 1]

As shown in FIG. 1, when charging coal into the coking chamber 1 of kiln No. 1, the three-way switching cock 8 of kiln No. 1 While increasing the rotation speed of the VVVF motor 17 and measuring the pressure of the high-pressure water supplied from the high- and middle-pressure water-and-water common pump 16 with the pressure gauge 18 to a set pressure of 35 kg / cm ^2.
Adjust to At this time, the controller 19 is set with a timer of 3 minutes required for charging coal as a charging period for charging coal into the coking chamber 1. Due to the ejector effect of the high-pressure and low-pressure water sprayed from the spray nozzle 7 provided in the bend section 4 of the riser pipe 3 corresponding to the carbonization chamber 1 of the kiln number No. 1, gas rising in the riser pipe 3 is bent. The gas is sucked into the collecting main pipe 6 located below, and dust generation when charging coal and gas leakage from the carbonization chamber 1 to the combustion chamber through the damaged portion of the furnace wall brick are prevented. Charging time 3 for the No. 1 charcoal chamber 1
In the early stage of carbonization after charging coal after a lapse of minutes, the controller 19
The VVVF motor 17 is rotated at a lower speed in response to a command from
Change the high-pressure low-pressure water supplied from 16 to medium-pressure low-pressure water, and set the pressure to 7 kg / cm ² . At this time, a timer of 60 minutes is set in the controller 19 as the initial time of the dry distillation after charging the coal. The reason for setting the initial time of carbonization to 60 minutes is that a large amount of carbonized gas is generated after charging coal in about 60 minutes, and gas leakage is remarkable during this time period. Because there is little gas leakage.

The pressure supplied from the high- and medium-pressure common-use water pump 16
7 kg / cm ² of medium-pressure low-pressure water is injected from a spray nozzle 7 provided at a bend section 4 of a riser 3 of kiln number No. 1, and a large amount of carbonized gas generated in the carbonization chamber 1 due to its ejector effect. There is no leakage to the combustion chamber, the riser 3 and the bend 4
Is sucked into the collecting main pipe 6 via After 60 minutes of the setting timer has elapsed, the kiln number N
The o.1 three-way switching cock 8 communicates with the low-pressure and low-pressure water supply pipe 12, and the set pressure 3 supplied from the low-pressure and low-pressure water dedicated pump 13
The low-pressure low-pressure water of kg / cm ² is supplied to the spray nozzle 7. The low-pressure cold water sprayed from the spray nozzle 7 cools the dry distillation gas at about 800 ° C. to about 100 ° C. The period for cooling the carbonized gas by the low-pressure low-temperature water injection is a period from the end of the initial carbonization to the extrusion of coke.

As shown in FIG. 2, the supply time schedule of the high-pressure, medium-pressure, and low-pressure water for each of the coal charging kilns into the coking chamber 1 shown in FIG. , And coal is charged in the order of No. 1, No. 6, No. 11, No. 16 ... every 10 minutes. As described above, high-pressure low-pressure water is supplied during the coal charging period for each kiln number, medium-pressure low-pressure water is supplied during the initial dry distillation after coal charging is completed, and after the initial dry distillation, the dry distillation is completed. By repeating the procedure of supplying low-pressure low-pressure water during the period until coke extrusion, the coal chamber 1 and medium-pressure low-pressure water corresponding to the coal charging period in which high-pressure low-pressure water is supplied even though coal is not actually being charged. The number of kilns in the carbonization chamber 1 in the early stage of carbonization that supplies
No. 2 by the time carbonization chamber 1 of the
Six kilns up to 6 carbonization chambers 1 are at the beginning of carbonization.

In the case of FIG. 2, for example, during the coal charging period of kiln No. 26, only the carbonization chamber 1 of kiln No. 26 is charged with coal. Kiln No.1, No.6, No.1
Although the carbonization chambers 1 of the five kilns No. 1, No. 16 and No. 21 are in the early stage of dry distillation, high-pressure water is jetted from the spray nozzle 7 for 3 minutes. The five kilns in the initial stage of carbonization have a large ejector effect due to the high-pressure and low-pressure water jetted from the spray nozzle 7, so that there is no danger of the carbonization gas leaking from the carbonization chamber 1. There is a danger that the amount of suction will increase. Therefore, as shown in FIG.
The high-pressure low-pressure water is supplied only to the spray nozzle 7 corresponding to the coal-charging chamber 1 during coal charging, and the low-pressure low-pressure water is temporarily supplied to the remaining carbonization chamber 1 in the early stage of dry distillation for a time corresponding to the coal charging period. Water may be supplied. In this case, gas leakage from the carbonization chamber 1 during coal charging can be prevented, and air suction into the remaining carbonization chamber 1 at the beginning of dry distillation can be prevented.

By the way, the pressure of the medium-pressured low-pressure water supplied to the spray nozzle 7 of the bend portion 4 of the riser 3 provided at the top of the carbonization chamber 1 in the early stage of carbonization from the completion of charging of coal to 60 minutes is 7 kg.
In order to maintain the range of 6 to 8 kg / cm ² with the center value at about 8 cm / cm ² , as shown in FIG. It can be seen that it is preferable to increase Therefore, based on FIG. 4, the number of rotations required for the high-medium-pressure and low-pressure common water pump 16 corresponding to the number of kilns in the early stage of dry distillation is determined in advance, and the number of rotations determined from the correspondence of the number of kilns is determined from the next time. V as the set rotation speed for water
If the VVF motor 17 is controlled, the pressure of the low-temperature water supplied to the spray nozzle 7 can be adjusted to a medium pressure of 7 kg / cm ² . By controlling the rotation speed of the common high-pressure / medium-pressure water supply pump 16, it was possible to cope with the carbonization chamber 1 in the initial stage of the dry distillation up to a maximum of 12 kilns.

As shown in FIG. 2, when the number of kilns for supplying high-pressure water to the spray nozzle 7 becomes plural during the coal charging period, the number of kilns shown in FIG.
If the pump speed corresponding to the number of kilns is obtained in advance from the relationship with the number of kilns, and the speed corresponding to this number of kilns is set as the set high-speed water-supplying speed from the next time, the VVVF motor 17 is controlled. The pressure of the low-temperature water supplied to the spray nozzle 7 can be adjusted to a high pressure. By controlling the number of rotations of the common pump 16 for high- and medium-pressure water, it was possible to cope with the carbonization chamber 1 for supplying high-pressure water to the spray nozzle 7 up to three kilns.

The present invention provides, for example, an existing high pressure and low pressure water pump for supplying high pressure and low pressure water from a spray nozzle to a bend portion of a riser provided at the top of a carbonization chamber. In this case, the low-pressure and low-pressure water pump can be used as it is, only the existing high-pressure and low-pressure water pump is removed, and the high-to-medium-pressure high-pressure and low-water pump 16 in the range surrounded by the frame indicated by line B in FIG. , VVVF motor 17 and controller 19 can be easily and inexpensively remodeled.

[0029]

As described above, according to the present invention, it is possible to cope with a charging period in which coal is sequentially charged into a large number of coking chambers and an initial carbonization after charging coal into each of the coking chambers. And V
By controlling the number of rotations of the common high-pressure and medium-pressure water pump by the VVF motor, the pressure of the low-pressure water supplied to the spray nozzle is adjusted to a high pressure and a medium pressure, while the period from the early stage of the dry distillation to the coke extrusion following the completion of the dry distillation. The low-pressure water is supplied to the spray nozzle by the operation of the pump for low-pressure water using a general-purpose motor.

As a result, there are two types of pumps: a high- and medium-pressure common water pump driven by a VVVF motor for supplying low-pressure water to the spray nozzle, and a low-pressure dedicated water pump exclusively driven by a general-purpose motor.
Only a table is required, and the pump and auxiliary equipment can be simplified, and the equipment cost can be reduced. In addition, the present invention can be easily applied and cost can be reduced only by making a simple modification to the existing equipment.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a control system for preventing gas leakage in a coking chamber in a coke oven of the present invention.

FIG. 2 is a schedule showing supply states of high-pressure, middle-pressure, and low-pressure water for each charging kiln number of the carbonization chamber of the present invention.

FIG. 3 is another schedule showing the supply status of high-pressure, medium-pressure, and low-pressure water corresponding to each charging kiln number of the coking chamber of the present invention.

FIG. 4 is a graph showing the relationship between the number of kilns in a coking chamber and the number of revolutions of a common high-pressure medium-pressure water pump when supplying medium-pressure low-temperature water.

FIG. 5 is a graph showing the relationship between the number of kilns in a coking chamber and the number of revolutions of a high / medium pressure water / common water pump when supplying high pressure water.

FIG. 6 is an explanatory diagram showing a conventional water supply pipe to a spray nozzle provided at a bend portion of a riser provided at the top of a carbonization chamber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coalization room 2 Coal packed bed 3 Ascending pipe 4 Bend part 5 Damper 6 Collecting main pipe 7 Spray nozzle 8, 9 Three-way switching cock 10 High-pressure low-pressure water pipe 11 Medium-pressure low-pressure water pipe 12 Low-pressure low-pressure water pipe 13 Low-pressure low pressure Pump for exclusive use of water 14 General-purpose motor 15 Piping for high- and medium-pressure low-pressure water 16 Pump for high- and medium-pressure low-pressure water 17 VVVF motor 18 Pressure gauge 19 Controller

Claims (6)

[Claims] 1. A high-pressure water is supplied to a spray nozzle provided at a bend portion of each riser pipe connecting a plurality of coking chambers arranged in a coke oven with a collecting main pipe during a period of charging coal into each coking chamber. Supply medium-pressure low-pressure water at the early stage of dry distillation after coal charging is completed to prevent gas leakage in the carbonization chamber, and supply low-pressure low-pressure water during the period from the beginning of dry distillation to coke extrusion following completion of dry distillation. In the method for preventing gas leakage from the coking chamber in a coke oven, which cools the generated gas, a high- and medium-pressure common water pump driven by a VVVF motor is installed, and a low-pressure water pump exclusively driven by a general-purpose motor is installed. Install,
VV during the charging period in which coal is charged into a large number of carbonization chambers sequentially.
By controlling the rotation speed of the high / medium pressure water supply common pump by the VF motor, the pressure of the water supply to the spray nozzle is adjusted to a high pressure, and the V
The VVF motor controls the rotation speed of the high-to-medium pressure water supply common pump to adjust the pressure of the water supply to the spray nozzle to medium pressure, while the general-purpose motor is used during the period from the early stage of carbonization to the extrusion of coke with the completion of carbonization. A method for preventing gas leakage from a coking chamber in a coke oven, wherein low-pressure water is supplied to a spray nozzle by driving a pump dedicated to low-pressure water. 2. When the number of rotations of the high-to-medium pressure water-supply common pump is controlled by a VVVF motor during a coal charging period in which coal is sequentially charged into the plurality of carbonization chambers, the carbonization chambers actually charged with coal are charged. In addition to adjusting the pressure of the low-pressure water supplied to the spray nozzles corresponding to the high pressure to the high pressure, the spray charging corresponding to the other carbonization chambers in the early stage of the dry distillation after the completion of the coal charging in the charging period. 2. The method for preventing gas leakage in a coking chamber in a coke oven according to claim 1, wherein high-pressure water is supplied temporarily from a high-pressure water-only pump in response to the following conditions. 3. When the number of rotations of the high-to-medium pressure common water pump is controlled by a VVVF motor during a coal charging period in which coal is sequentially charged into the plurality of carbonization chambers, the carbonization chambers actually charged with coal are charged. In addition to adjusting the pressure of the low-pressure water supplied to the spray nozzles corresponding to the high pressure to the high pressure, the spray charging corresponding to the other carbonization chambers in the early stage of the dry distillation after the completion of the coal charging in the charging period. 2. The method according to claim 1, wherein the low-pressure low-pressure water is temporarily supplied from a low-pressure low-pressure water pump. 4. A high-to-medium pressure, common water pump is controlled by using a VVVF motor so that the number of kilns at the early stage of dry distillation after the completion of charging coal into each of the coking chambers is set to a preset number of rotations. The pressure of the low-temperature water supplied to the spray nozzle is adjusted to a medium pressure by performing the above operation.
Or a method for preventing gas leakage in a coking chamber in a coke oven according to item 3. 5. A VVVF motor using a high-medium pressure water-supply common pump to rotate at a preset number of rotations corresponding to the number of kilns in a charging period in which coal is sequentially charged into each of the carbonization chambers. 2. The method according to claim 1, wherein the control is performed to adjust the pressure of the water supplied to the spray nozzle to a high pressure.
The method for preventing gas leakage from a coking chamber in a coke oven according to 2, 3, or 4. 6. A high-pressure water is supplied to a spray nozzle provided at a bend portion of each riser pipe connecting a plurality of carbonization chambers arranged in a coke oven and a collecting main pipe when coal is charged into each carbonization chamber. Coke that supplies medium-pressure low-pressure water at the beginning of dry distillation after coal charging is completed to prevent gas leakage in the coking chamber, and supplies low-pressure low-pressure water during the period from subsequent dry distillation to coke extrusion to cool the generated gas. In a gas leak prevention device for a coking chamber in a furnace, a common pump for supplying high- and medium-pressure water to each spray nozzle and a VVVF motor that operates the common pump for high-medium-pressure water by controlling the rotation speed are provided. And a low-pressure and low-pressure water-only pump that supplies low-pressure and low-pressure water to each spray nozzle, a general-purpose motor that drives this low-pressure and low-pressure water-only pump, and high-to-medium-pressure and low-pressure low-pressure water to each spray nozzle Three sides A gas leakage prevention device for a coking chamber in a coke oven, comprising a cock.