JP2006124508A - Releae valve for coke oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new release valve for a coke oven, capable of eliminating the risk of operation at the machine side. <P>SOLUTION: This release valve for the coke oven disengaging coke oven gas into atmosphere when the pressure of the coke oven gas in a gas collecting tube is elevated, is equipped with a casing 12 on which an opening through which the coke oven gas passes through, is formed, a valve main body 21 for opening/closing the opening by its rotation centering around a rotary shaft 20 and a cylinder actuator 35a for rotatably driving the valve main body 21. By actuating the cylinder actuator 35a, the valve main body 21 rotates and the opening opens up, and also when a moment working on the valve main body 21 caused by the pressure of the coke oven gas becomes larger than the moment caused by the own weight of the valve main body 21, the valve main body 21 rotates to open the opening even without actuating the cylinder actuator 35a. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a coke oven diffusion valve that releases coke oven gas to the atmosphere when the pressure of the coke oven gas in the air collection tube of the coke oven increases.

  In the coke oven, a carbonization chamber and a combustion chamber are alternately arranged above the heat storage chamber to form a furnace group. Coal is carbonized in the carbonization chamber, fuel gas is combusted in the combustion chamber, and preheated combustion exhaust gas is used in the heat storage chamber. The coal charged into the carbonization chamber is heated by the amount of heat supplied through the furnace wall bricks from the combustion chambers on both sides of the carbonization chamber. During the carbonization process, coal volatiles decompose and generate gas. The coke oven gas generated in the carbonization chamber passes through the ascending pipe of the coke oven, gathers in the air collection pipe (dry main), is cooled, and is led to the gas purification plant. The coke oven gas is extracted from the carbonization chamber by suction of a gas exhauster and led to a gas purification plant.

  For example, when a gas exhauster fails and stops, combustible coke oven gas accumulates in the coke oven, which is dangerous. For this reason, as a kind of safety device, there is provided a diffusion valve for releasing the gas in the air collecting pipe to the atmosphere when the pressure in the air collecting pipe of the coke oven becomes abnormally high. The diffusion valve has a structure in which an opening through which the coke oven gas can pass is covered with a valve body.

  There are three types of release valves: automatic opening / closing by pressure, automatic opening / closing by cylinder actuator, and manual opening / closing by cylinder actuator.

  In the automatic open / close type diffusion valve by pressure, when the pressure in the air collecting pipe becomes high, the valve body automatically rotates around the rotation shaft by the pressure in the air collecting pipe and the diffusion valve is opened.

  In the automatic opening / closing type diffusion valve by the cylinder actuator, the pressure in the air collecting pipe is detected, and when the pressure exceeds a predetermined value, the cylinder actuator is operated to open the diffusion valve.

  In the manual open / close type diffusion valve with cylinder actuator, regardless of the pressure in the air collection tube, the cylinder actuator is activated by the operator's remote operation to open the diffusion valve in the event of an abnormality such as a gas exhauster failure. .

However, each of the above three types of diffusion valves has the following problems.
In an automatic open / close type pressure release valve by pressure, the valve body does not rotate even if the pressure in the air collection pipe increases due to galling of bearings that rotatably support the rotary shaft of the valve body, rust, clogging of obstacles, etc. Sometimes. If this happens, the worker must go to the side of the diffusion valve (machine side) and operate the lever to open and close the diffusion valve, which is dangerous work.

  In an automatic open / close type diffusion valve using a cylinder actuator, it is necessary to detect the pressure in the air collecting pipe, and maintenance of the pressure detection device is absolutely necessary.

  With a manual open / close type diffusion valve using a cylinder actuator, it may not be possible to open the diffusion valve as soon as the pressure in the air collecting pipe becomes high, and there is a risk that it will not serve as a safety device.

  Therefore, an object of the present invention is to provide a new coke oven diffusion valve that can eliminate the risk of machine-side operation.

  In order to solve the above problems, the invention of claim 1 is a coke oven diffusion valve for releasing coke oven gas to the atmosphere when the pressure of the coke oven gas in the air collecting tube of the coke oven increases. A casing in which an opening through which furnace gas passes is formed; a valve main body that is provided in the casing and rotates around a rotation shaft to open and close the opening; and a drive source that rotationally drives the valve main body. The valve body is rotated by operating the drive source to open and close the opening, and when the moment acting on the valve body by the pressure of the coke oven gas is larger than the moment due to the weight of the valve body The valve main body rotates to open the opening without operating the drive source.

  According to a second aspect of the present invention, in the coke oven diffusion valve according to the first aspect, the drive source is a cylinder actuator capable of advancing and retracting an output shaft, and a drive arm is attached to the rotary shaft, and the drive arm When the drive arm is pushed by the output shaft separated from the valve body, the valve body rotates to open and close the opening.

  The invention according to claim 3 is the coke oven diffusion valve according to claim 2, wherein two cylinder actuators are provided in the vicinity of both ends of the drive arm whose center in the longitudinal direction is attached to the rotary shaft, When one cylinder actuator pushes one end of the drive arm, the valve body rotates to open the opening, and the other cylinder actuator pushes the other end of the drive arm, The valve main body rotates to close the opening.

  According to a fourth aspect of the present invention, in the coke oven diffusion valve according to any one of the first to third aspects, a counterweight is attached to the rotating shaft to counter a moment due to the weight of the valve body. And

  A fifth aspect of the present invention is the coke oven diffusion valve according to any one of the first to fourth aspects, wherein the casing includes a bottom plate and a pipe portion that protrudes upward from the bottom plate and forms the opening. The valve body covers the opening of the casing, and without contacting the upper end of the pipe portion, a cover whose edge contacts the bottom plate, and a handle fixed to the cover, And water is stretched around the pipe portion of the casing.

  The invention of claim 6 is a coke oven diffusion valve for releasing coke oven gas to the atmosphere when the pressure of the coke oven gas in the air collecting pipe of the coke oven rises, and an opening through which the coke oven gas passes is provided. A casing formed, a valve body that rotates around a rotation shaft to open and close the opening, a drive arm that is attached to the rotation shaft, and a cylinder actuator that can move the output shaft back and forth, and is separated from the drive arm Further, when the drive arm is pushed by the output shaft, the valve main body rotates to open and close the opening.

  According to the first aspect of the present invention, normally, the diffusion valve automatically opens due to the pressure of the coke oven gas, and even if a galling of a bearing or the like occurs and the valve body does not rotate, The diffusion valve can be opened and closed by operation. Since the automatic opening / closing by the pressure of the coke oven gas and the opening / closing by the operation of the drive source are used in combination, the danger of the machine side operation can be eliminated.

  According to the invention of claim 2, automatic opening and closing by pressure and opening and closing by actuation of a drive source can be used in combination.

  According to the invention of claim 3, the diffusion valve can be reliably opened and closed by providing the cylinder actuator for opening the diffusion valve and the cylinder actuator for closing the diffusion valve.

  According to invention of Claim 4, even if the pressure of coke oven gas is low, a diffusion valve can be opened.

  According to the fifth aspect of the present invention, since the coke oven gas is sealed with water, not between the metals, the coke oven gas can be reliably sealed when the diffusion valve is closed.

  According to the invention of claim 6, the diffusion valve can be opened and closed by operating the drive source. Further, since the output shaft of the drive source and the drive arm are separated, the diffusion valve can be automatically opened by the pressure of the coke oven gas without operating the drive source. Therefore, automatic opening / closing by pressure and opening / closing by actuation of the drive source can be used in combination.

  FIG. 1 shows a cross-sectional view of a coking oven carbonization chamber. In the coke oven, there is a heat storage chamber 1 in the lower part of the furnace body, and combustion chambers and carbonization chambers 2 are alternately arranged in the upper part of the heat storage chamber 1. There are combustion chambers composed of a large number of flues on both sides (in the depth direction in FIG. 1) of the carbonization chamber 2 into which coal is charged. Combustion gas is combusted in the combustion chamber, and the coal in the carbonization chamber 2 is heated through the furnace wall. Combustion gas and air (only air in the case of rich gas heating) are preheated in the heat storage chamber 1, burned in the combustion chamber, returned to the adjacent heat storage chamber 1, recovered, and discharged through the flue 3. There are two types of coke ovens: a single furnace that uses only coke oven gas (rich gas) as fuel, and a double furnace that can use both blast furnace gas (poor gas) with low calorific value and coke oven gas (rich gas). . FIG. 1 shows a dual furnace, which has both a rich gas supply facility 4 for supplying a rich gas and a poor gas supply facility 5 for supplying a poor gas.

When air is blocked and the caking coal is heated and heated, the following changes generally occur as the heating temperature rises. Up to 100 ° C., CH ₄ and occluded CO are released simultaneously with the evaporation of moisture. From 100 ° C. to 300 ° C., a small amount of CO and H ₂ stored in the mineral water and coal contained in the mineral is released. When the temperature exceeds 300 ° C., the original thermal decomposition of coal starts, and gas, compound water and tar are rapidly generated, and softening and melting cause expansion phenomenon. When it reaches 500 ° C., most of it solidifies and becomes a porous massive semi-coke. The cracked gas is generated after this, while the remainder shrinks along with this, and the generation of the cracked gas is almost finished at 900 ° C. or higher, and high temperature dry distillation coke is obtained.

  In this way, during the production of coke, volatile matter in the coal is decomposed and gas is generated during the carbonization process. The gas passes through the ascending pipe 6 of the coke oven and is collected in the air collecting pipe 7 (dry main). In the ascending pipe 6 or the air collecting pipe 7, the gas liquid is sprayed and the gas is cooled, for example, from about 800 ° C. to 80 to 100 ° C. The cooled gas is guided to a gas refinery by suction of a gas exhauster.

  For example, if the gas exhauster fails and stops, combustible coke oven gas accumulates in the coke oven, which is dangerous. For this reason, as a kind of safety device, when the pressure in the air collecting tube 7 of the coke oven becomes abnormally high (for example, when it becomes several tens of mmAq or more), a diffusion valve 8 is provided to release the gas in the air collecting tube 7 to the atmosphere. It is done.

  2 and 3 show a diffusion valve 8 attached to the air collecting tube 7. The diffusion valve 8 is formed by incorporating a valve mechanism in a substantially rectangular parallelepiped casing 12. A branch pipe 9 branched from the air collection pipe 7 is connected to the lower end of the diffusion valve 8. A diffusion pipe 11 that is open to the atmosphere like a chimney is connected to the upper end of the diffusion valve 8.

  A pipe part 13 is fixed to the bottom plate 12 a of the casing 12, and the lower end of the pipe part 13 is connected to the branch pipe 9. The tube portion 13 slightly protrudes upward from the bottom plate 12a disposed in the horizontal plane. An opening 13 a through which the coke oven gas passes is formed on the inner periphery of the pipe portion 13. A water reservoir wall 14 is provided around the pipe portion 13 so that water can be stretched around the pipe portion 13.

  A connecting pipe 15 connected to the diffusion pipe 11 is provided on the upper plate 12b of the casing. The side plate 12 c of the casing 12 is provided with a viewing window 16 for looking into the inside of the casing 12 and an inspection port 17 for cleaning the inside of the casing 12. In addition, the side plate 12c of the casing 12 is filled with water around the pipe portion 13 to seal the coke oven gas, or is used to clean the inside of the casing 12, water, industrial water, and steam inlet pipes. 19 is provided.

  Inside the casing 12, a valve main body 21 that rotates around the rotary shaft 20 to open and close the opening 13a is provided. The valve body 21 includes a bowl-shaped cover 23 that covers the opening 13 a and a handle 24 that is fixed to the cover 23. The cover 23 is formed by bending the periphery of a substantially disk-shaped member. The central portion 23a of the cover 23 is curved so that the center rises. A disc-shaped inner lid 25 is attached to the central portion 23 a of the cover 23 for reinforcement and protection of the cover 23, which is close to the upper end of the tube portion 13 and whose diameter substantially matches the diameter of the tube portion 13. . When the valve body 21 is opened, the pressure in the air collection tube 7 is applied to the cover 23.

  A plurality of saw blades 26 are formed in the lower portion of the annular frame portion 23b. In the state in which the valve body 21 is closed (the state shown in FIG. 2), the tip of the blade 26 abuts against the bottom plate 12a, while the inner lid 25 does not contact the upper end of the tube portion 13, and there is a slight gap. Free. When water is applied on the bottom plate 12 a, the water passes through the gap between the blades 26 and collects around the pipe portion 13. Water is stored up to a position higher than the root of the blade 26. Thereby, coke oven gas can be sealed with water stored on the bottom plate 12a. A sleeve 28 is fixed to the proximal end of the handle 24, and the sleeve 28 is joined to the rotary shaft 20 via joining means such as a key (see FIG. 3).

  As shown in FIG. 3, the rotary shaft 20 passes through the side plates 12c facing each other. A key groove 20 a for attaching the valve body 21 is formed at the center of the rotating shaft 20. A counterweight 30 is attached to one end of the rotating shaft 20 in the axial direction to counter the moment due to the weight of the valve body 21, and the valve body 21 is manually operated on the other end of the rotating shaft 20 on the machine side. The lever 31 for making it attach is attached. In addition, as a coupling means for the rotary shaft 20 and the valve body 21, various means such as welding can be used in addition to those using a key. The rotating shaft 20 is rotatably supported by a bearing 39 fixed to the outer surface of the casing.

  FIG. 4 shows a side view of the diffusion valve. A drive arm 32 is connected to one end of the rotating shaft 20. The drive arm 32 is elongated and the center in the longitudinal direction is connected to the rotary shaft 20. A roller 33 is rotatably attached to both ends of the drive arm 32.

  In the vicinity of both ends of the drive arm 32, two cylinder actuators 35a and 35b are provided as drive sources that push the roller 33 to rotate the drive arm 32 in the clockwise and counterclockwise directions. The cylinder actuators 35 a and 35 b are fixed to a support bracket 34 that is fixed to the casing 12. The cylinder actuators 35a and 35b linearly move the output shafts 36a and 36b by air pressure or hydraulic pressure, and advance and retract the output shafts 36a and 36b with respect to the cylinder body. Contact portions 37 a and 37 b that push the roller 33 are provided at the tips of the output shafts 36 a and 36 b, and the contact portions 37 a and 37 b are separated from the roller 33 of the drive arm 32. The two cylinder actuators 35a and 35b are arranged on the upper side, and are divided into an open cylinder 35a for opening the diffusion valve and a closed cylinder 35b arranged on the lower side for closing the diffusion valve.

FIG. 5 shows the open / close state of the diffusion valve by the operation of the cylinder actuator. In the state (S1) in which the normal diffusion valve is closed, both the open cylinder 35a and the closed cylinder 35b are contracted. The arm 32 is inclined from the vertical line so that the roller 33 at its upper end is close to the open cylinder 35a and the roller 33 at its lower end is away from the closed cylinder 35b.
When the release valve is opened (S2), the open cylinder 35a is operated, and the arm 33 is rotated counterclockwise by pushing the roller 33 at the upper end with the output shaft 36a. As the arm 32 rotates, the valve body 21 (not shown) also rotates, and the opening 13a opens. Thereafter, the open cylinder 35a retracts the output shaft 36a.

  Since the roller 33 and the output shaft 36a are separated from each other, even if the open cylinder 35a retracts the output shaft 36a, the diffusion valve remains open (S3). At this time, the arm 32 is inclined in the opposite direction from the vertical line so that its upper end portion is away from the open cylinder 35a and its lower end portion is close to the closed cylinder 35b.

  When closing the release valve (S4), the closed cylinder 35b is operated and the roller 33 is pushed by the output shaft 36b to rotate the drive arm 32 in the clockwise direction. As the drive arm 32 rotates, the valve body 21 also rotates and the opening 13a closes.

  Thereafter, the closed cylinder 35b retracts the output shaft 36b. And a diffusion valve maintains a normal closed state (S5).

  Regarding the control of the open / close cylinders 35a and 35b, it is conceivable to be based on remote operation by an operator or based on dry main pressure detection. The control by the operator's remote operation refers to, for example, operating the open / close cylinders 35a and 35b that the operator did not open by remote operation when some of the plurality of diffusion valves are open but the rest are closed. It means to make it. In addition, the open / close cylinders 35a and 35b may be automatically operated when the pressure of the dry main body is detected and becomes equal to or higher than a predetermined pressure.

  FIG. 6 shows automatic opening / closing of the diffusion valve by the pressure of the coke oven gas regardless of the operation of the opening / closing cylinders 35a, 35b. When the release valve is automatically opened and closed by pressure, the open cylinder 35a and the closed cylinder 35b draw the output shafts 36a and 36b, and are not operating.

  FIG. 7 shows the operating principle of automatic opening and closing by pressure. When the sum of the moment acting on the valve body 21 due to the pressure of the coke oven gas and the moment due to the weight of the counterweight 30 is greater than the moment due to the weight of the valve body 21, the valve body 21 attached to the rotary shaft 20 is Rotate to open the opening.

  As shown in FIG. 6, when the pressure of the dry main coke oven gas rises and the valve body 21 rotates around the rotation shaft 20, the drive arm 32 attached to the rotation shaft 20 also rotates. The output shafts 36a and 36b of the open cylinder 35a and the closed cylinder 35b are separated from the drive arm 32. In addition, the output shafts 36a and 36b are pulled in so as not to disturb the rotation of the drive arm 32. Thereby, automatic opening and closing by the pressure of the coke oven gas and opening and closing by the operation of the opening and closing cylinder can be used in combination.

Sectional drawing of the carbonization chamber of a coke oven. Detailed view of the release valve. III-III sectional view taken on the line of FIG. The side view of a diffusion valve. The figure which shows the open / close state of the diffusion valve by the action | operation of a cylinder actuator. The figure which shows the automatic opening and closing of the diffusion valve by the pressure of coke oven gas. The operation principle diagram of the valve body.

Explanation of symbols

7 ... Air collecting pipe 8 ... Dissipation valve 12 ... Casing 12a ... Bottom plate 13 ... Pipe part 13a ... Opening 20 ... Rotating shaft 21 ... Valve body 23 ... Cover 23a ... Center part (cover)
23b ... Frame (cover)
24 ... Pattern 25 ... Inner lid (cover)
30 ... Counter weight 32 ... Drive arm 33 ... Roller 35a ... Open cylinder (cylinder actuator)
35b ... Closed cylinder (cylinder actuator)
36a, 36b ... output shaft

Claims (6)

A coke oven diffusion valve that releases coke oven gas to the atmosphere when the pressure of the coke oven gas in the air collection pipe of the coke oven rises,
A casing in which an opening through which coke oven gas passes is formed;
A valve body that is provided in the casing and rotates around a rotation axis to open and close the opening;
A drive source for rotationally driving the valve body,
By operating the drive source, the valve body rotates to open and close the opening,
Further, when the moment acting on the valve body due to the pressure of the coke oven gas is larger than the moment due to the weight of the valve body, the valve body rotates and the opening opens without operating the drive source. A diffusion valve for coke ovens. The drive source is a cylinder actuator that can advance and retract the output shaft,
A drive arm is attached to the rotating shaft,
2. The coke oven diffusion valve according to claim 1, wherein when the driving arm is pushed by the output shaft separated from the driving arm, the valve main body rotates to open and close the opening. Two cylinder actuators are provided in the vicinity of both ends of the drive arm attached to the rotating shaft at the center in the longitudinal direction.
When one cylinder actuator pushes one end of the drive arm, the valve body rotates to open the opening,
3. The coke oven diffusion valve according to claim 2, wherein when the other cylinder actuator pushes the other end of the drive arm, the valve body rotates and the opening is closed.   The coke oven diffusion valve according to any one of claims 1 to 3, wherein a counterweight is attached to the rotating shaft in order to oppose a moment due to its own weight of the valve body. The casing includes a bottom plate, and a pipe portion that protrudes upward from the bottom plate and forms the opening,
The valve body covers the opening of the casing, and has a cover whose edge contacts the bottom plate without contacting the upper end of the pipe portion, and a handle fixed to the cover,
5. The coke oven diffusion valve according to claim 1, wherein water is stretched around the pipe portion of the casing. A coke oven diffusion valve that releases coke oven gas to the atmosphere when the pressure of the coke oven gas in the air collection pipe of the coke oven rises,
A casing in which an opening through which coke oven gas passes is formed;
A valve body that rotates about a rotation axis to open and close the opening;
A drive arm attached to the rotating shaft;
A cylinder actuator capable of moving the output shaft back and forth,
A coke oven diffusion valve, wherein the valve main body is rotated to open and close the opening by pushing the drive arm with the output shaft separated from the drive arm.

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