JPH0699685B2 - Coke oven flow controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for adjusting the flow rate of fuel gas and / or air fed into a heat storage chamber of a coke oven.

[0002]

2. Description of the Related Art A coke oven is provided with a plurality of coal-charging chambers in which coal is charged, a combustion chamber for heating the coal-charging chamber, and a heat storage chamber disposed below. The fuel gas supplied from the heat storage chamber to each combustion chamber burns while keeping the temperature of the combustion chamber constant.
As a result, the coking reaction of the coal charged in the carbonization chamber is uniformly maintained, and coke having stable quality is obtained. As a means for supplying the fuel gas to the heat storage chamber, for example, an under jet method is known in which a pipe is piped in each heat storage chamber and the flow rate control mechanism provided in the pipe pipe controls the flow rate of fuel gas, air, or the like.

In the coke oven adopting the under jet method, as shown in FIG. 1, a heat storage chamber 3 is connected to a plurality of rows of combustion chambers 2 arranged in an upper portion of a furnace body 1. In the lower part of the heat storage chamber 3, a fuel gas supply system 4 is arranged together with an air supply system 3a, and a duct 5 directly connected to the fuel gas supply system 4 extends along the furnace length direction. Distribution branch pipe 5a branched from the duct 5
At the bottom of each heat storage chamber 3, a plurality of under jet pipes 6 are branched and provided. Then, the flow rate adjusting orifice attached to the under jet pipe 6 adjusts the flow rate of the fuel gas fed into each heat storage chamber 3 from below.

The orifice is attached to the underjet pipe 6 with the attachment structure shown in FIG. 2, for example. In this case, an annular plate is used as the orifice 7, the effective cross-sectional area of the underjet pipe 6 is reduced by the flow passage area of the central opening 7b, and the flow rate of the fuel gas flowing from the distribution branch pipe 5a into the underjet pipe 6 is adjusted.

The orifice 7 is a pin 7c inserted between the inner wall of the underjet pipe 6 and the mounting seat 7b.
The lower surface is supported by and is detachably provided in the under jet pipe 6. In addition, the orifice 7 by the pin 7c
In order to securely support the above, the rising portion of the pin 7c is pressed against the inner wall of the under jet pipe 6 by the packing 7b.

The pin 7c and the packing 7 are caused by the vibration of the piping system and the pulsation of the fuel gas generated during the operation of the coke oven.
In some cases, d, etc. may deviate from a predetermined position. This positional deviation causes a positional relationship between the orifice 7 and the under jet pipe 6, and the flow rate of the fuel gas fed into the heat storage chamber 3 fluctuates. Further, if the positional deviation of the pin 7c is large, the orifice 7 may fall out of the under jet pipe 6.

The operation of returning the orifice 7 that has been misaligned or dropped out to the normal position is performed by removing the plug 8 and opening the work port 9. The working port 9 feeds the fuel gas into the heat storage chamber 3 at different flow rates, and is therefore also used when replacing the orifice 7 with the central opening 7a of different size.

[0008]

In the mounting structure shown in FIG. 2, operations such as position correction and replacement of the orifice 7 are complicated and troublesome. For example, in order to correct the misaligned orifice 7 to the normal position, the plug 8
It is necessary to remove the position and adjust the position of the orifice 7 from the working port 9. At this time, the pin 7c and the packing 7d that have caused the positional deviation are also adjusted.

However, since the work is performed in a narrow space inside the under jet pipe 6, the orifice 7
It takes a lot of time and effort to adjust the position. Moreover, since a large number of orifices are provided for each coke oven, a skilled technique is required to finish the adjustment work of the large number of orifices 7 in a short time.

In order to solve this drawback, the actual construction of Sho 63-1
In Japanese Patent No. 54648, it is proposed that a sleeve-shaped fixing member is attached to the entrance of the under jet pipe, and an orifice formed of a flexible tubular body is detachably fitted to the fixing member. According to this method, a predetermined flow passage area can be set by a simple operation of attaching a flexible orifice to the sleeve-like fixing metal fitting,
The flow rate of the fuel gas is controlled reliably.

However, even in the newly proposed method, the plug 8 is removed and the working port 9 is removed when the orifice is replaced to change the flow passage cross-sectional area or when the position of the mounted orifice is adjusted or finely adjusted. Need to be released. Distributing branch pipe 5 by opening work port 9
A large amount of dust or the like floating in a is discharged to the outside, and the working environment is significantly deteriorated. Further, since the worker enters the under jet pipe 6 through the work port 9, the worker is exposed to rust and foreign matter adhering to the inner surfaces of the distribution branch pipe 5a and the under jet pipe 6.

Moreover, since the adjusting cock is opened and closed together with the opening of the work port 9, two or more workers are required to adjust the orifice. In addition, since the gas is turned on and off according to the removal and mounting of the plug 8, the working time becomes long and the operating efficiency of the coke oven is lowered.

The present invention has been devised to solve such a problem, and an object thereof is to make it possible to adjust the flow rate of fuel gas by a simple operation from the outside without opening the working port. And

[0014]

In order to achieve the object, a fuel gas flow rate adjusting device of the present invention has a valve seat fixed to a branch portion of an underjet pipe leading to a distribution branch pipe and a heat storage chamber, and the distribution branch pipe. A lid body airtightly attached to the working port provided, and a spindle having a conical needle facing the inner space of the valve seat attached to the tip of the spindle body, and the spindle projecting to the outside of the distribution branch pipe. And a needle valve mechanism having a handle attached to the other end thereof, and the degree of fitting of the needle with respect to the valve seat is adjusted by operating the handle.

As the valve seat, a short tubular member made of a synthetic resin having excellent heat resistance can be used. The needle is preferably attached to the tip of the spindle via an elastic body in order to absorb the displacement of the center position with respect to the valve seat.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. The fuel gas flow rate adjusting device of the present embodiment includes a needle valve mechanism 10 having the structure shown in FIG. In the needle valve mechanism 10, a conical needle 12 is attached to the tip of a spindle 11 with a lock nut 13. The needle 12 is a main part that has a function of adjusting the flow rate of the fuel gas, and is a part that comes into most contact with the fuel gas. Therefore, it is preferable that the needle 12 is made of a heat resistant resin such as phenol that is resistant to oxidation and rusting. Further, since the spindle 11 is also likely to be oxidized and rusted by coming into contact with COG, BFG, etc., it is preferably made of a corrosion resistant material such as stainless steel and further coated with Teflon coating having excellent lubricity.

As a means for attaching the needle 12 to the tip of the spindle 11, it is possible to cut a tap on the lower part of the needle 12 and fix it to the tip of the spindle 11 with a pin. However, since this connecting portion is also exposed to the oxidative corrosive atmosphere, in the present embodiment, the tip of the spindle 11 is threaded, and the lock nut 13 made of a corrosion resistant material such as stainless steel is screwed onto the screw of the tip of the spindle 11. The method of fixing the needle 12 by doing so was adopted.

A spring 14 is preferably interposed at the connecting portion between the spindle 11 and the needle 12. The needle 12 has a slight degree of freedom in the direction orthogonal to the longitudinal direction of the spindle 11 due to the elastic connection via the spring 14. As a result, the valve seat 34 (see FIG.
The misalignment with respect to the central axis of (see) is absorbed.

The spindle 11 is rotatably inserted through a support frame 16 via an adjusting nut 15. The support frame 16 is fixed by a bolt 22 to a lid 20 mounted on a work opening 32 (see FIG. 4) of the distribution branch pipe 30.
The support frame 16 projects further downward from the lower lid 20,
A handle 17 is attached to the lower end by a nut 18.

Since the support frame 16 is exposed to a corrosive atmosphere, it is made of a corrosion resistant material such as stainless steel.
However, since oil is injected into the inside of the support frame 16 from the outside and a thick tube is used, a support frame made of an inexpensive steel material can also be used. Further, the support frame 16 is provided with a large diameter portion 19 located outside the lid body 20. A packing 19a is attached to the inner peripheral surface of the large diameter portion 19, whereby the spindle 11 is airtightly supported.

The portion of the support frame 16 that penetrates the lid 20 has, for example, a hexagonal cross section, and when the support frame 16 is inserted into the lid 20 having a hexagonal hole corresponding thereto, it is prevented from rotating with respect to the lid 20. The support frame 16 is attached to the lid body 20 in the closed state.

The lid 20 has a double structure in which a valve lid 21 is fixed to a lower lid 23 with bolts 22. Also, the lid 20
A rubber packing 24 is attached to the lower lid 23 so that fuel gas does not leak to the outside from between the support frame 16 and the support frame 16. The lower lid 21 is formed in a bottomed cylindrical shape, and is engraved with a female screw portion 25 that is screwed into a male screw portion provided on the periphery of the working port 32 (see FIG. 4) of the distribution branch pipe.

The distribution branch pipe 30 of the coke oven, in which the needle valve mechanism 10 is incorporated, branches an under jet pipe 31 as shown in FIG. A work port 32 is provided on the peripheral surface of the distribution branch pipe 30 on the side opposite to the under jet pipe 31.
Is opened, and a peripheral wall 33 that defines the working port 32 is engraved with a male screw portion that meshes with the female screw portion 25 of the lower lid 23.

A valve seat 34 is attached to the inlet side of the under jet pipe 31 branched from the distribution branch pipe 30. As the valve seat 34, the opening portion of the short tubular valve seat 34 as shown in FIGS. 4 (a) and 4 (b) is included, including the normal thick annular valve seat 34 shown in FIG. 4 (c). Can be adopted.

The short tubular valve seat 34 is made of a synthetic resin such as polypropylene resin having excellent heat resistance and is adhered to the inner peripheral surface of the under jet pipe 31 with an adhesive. The needle 12 is inserted into the valve seat 34, and a regulated flow passage cross section is formed between the needle 12 and the valve seat 34. Since the length of the short tubular valve seat 34 can be adjusted appropriately, it is advantageous when applied to a coke oven in which the branch branch pipes 30 have different diameters.

The inner diameter D of the valve seat 34 is preferably equal to or slightly smaller than the maximum diameter d of the needle 12. As a result, the needle 12 does not completely fit inside the valve seat 34, and the needle 12 moves in the axial direction of the spindle 11 due to dust that is easily accumulated between the inner surface of the valve seat 34 and the peripheral surface of the needle 12. Is prevented. Further, since the needle 12 or the valve seat 34 made of resin or resin is used,
Accumulation of dust and the like is also reduced.

When the female thread portion 25 of the lower lid 23 is screwed into the male thread portion of the peripheral wall 33 and the lid body 20 is attached to the working opening 32,
The needle 12 at the tip of the needle valve mechanism 10 has a valve seat 3
Directs to the inner space of 4. At this time, since the rubber packing 24 is pressed against the lower lid 23 at the lower end of the peripheral wall 33, the lid 20 is airtightly attached to the working opening 32, and the fuel gas in the distribution branch pipe 30 does not leak to the outside. .

The distance between the valve seat 34 and the needle 12 is
It is adjusted by operating the handle 17. That is, when the handle 12 is rotated in one direction, the support frame 16
The spindle 11 is pitch-fed inside, and the needle 12 at the tip approaches the valve seat 34. Further, when the handle 12 is rotated in the opposite direction, the needle 12 is separated from the valve seat 34. In this way, the needle 12 moves between the fully open position shown by the solid line and the fully closed position shown by the dotted line in FIG. 4B by the operation from the outside.

The gap g between the needle 12 and the valve seat 34 changes according to the movement of the needle 12, and the required flow passage cross-sectional area is secured. As a result, the flow rate of the fuel gas flowing into the under jet pipe 31 from the distribution branch pipe 30 can be adjusted by a simple operation of operating the handle 17 from the outside without removing the lid 20. At this time,
When the needle 12 is attached to the tip of the spindle 11 via an elastic body such as the spring 14, even if the axis of the spindle 11 and the axis of the valve seat 34 are slightly deviated from each other, the valve seat 34 In contrast, the needle 12 can be applied in a regular positional relationship.

Further, since the flow rate is adjusted without opening the working port 32, dust and the like are not emitted to the outside due to the fuel gas flowing in the distribution branch pipe 30, and the inside of the distribution branch pipe 30 is prevented. As a result, adverse effects such as gas pressure fluctuations and temperature changes on the atmosphere in the heat storage chamber are also prevented. Moreover, it does not require opening and closing work of the adjusting cock,
Since the work is performed regardless of the gas drawing, the flow rate can be adjusted by one worker in a short time. As a result, the moving efficiency of the coke oven is significantly improved.

[0031]

As described above, in the gas flow rate control device of the present invention, the distance between the valve seat and the needle is changed by operating the external handle, so that the required flow passage cross-sectional area can be obtained. Have secured. Therefore, it is not necessary to remove the lid attached to the work opening as seen when the conventional orifice is used, and the flow rate adjustment work can be completed in a short time with a simple operation. As a result, the working environment is maintained clean and the moving efficiency of the coke oven itself is improved.

[Brief description of drawings]

FIG. 1 Coke oven with underjet pipe

FIG. 2 Conventional flow rate adjustment mechanism with a built-in orifice

FIG. 3 is a gas flow rate control device used in the embodiment of the present invention.

FIG. 4 is a distribution branch pipe equipped with the same gas flow rate control device.

[Explanation of symbols]

10: Needle valve mechanism 11: Spindle 12:
Needle 17: Handle 20: Lid 30:
Distribution branch pipe 31: Under jet pipe 32: Working port 34: Valve seat

Claims (3)

[Claims] 1. A valve seat fixed to a branch portion of an underjet pipe leading to a distribution branch pipe and a heat storage chamber, a lid body airtightly attached to a work opening provided in the distribution branch pipe, an internal space of the valve seat or the above. A conical needle facing the valve seat, a spindle having a tip attached to the tip of the spindle penetrates the lid, and a needle valve mechanism having a handle attached to the other end of the spindle protruding outward of the distribution branch pipe; A coke oven fuel gas and / or air flow rate adjusting device, wherein the degree of fitting of the needle to the seat is adjusted by operating the handle. 2. A flow rate adjusting device for fuel gas and / or air for a coke oven, wherein the valve seat according to claim 1 is formed of a synthetic resin having excellent heat resistance in a short tubular shape. 3. The coke oven fuel gas and / or air flow rate adjusting device, wherein the needle according to claim 1 is attached to the tip of a spindle via an elastic body.