JPS6232175A - Method of cleaning valve of heating gas feeding device of coke oven - Google Patents

Abstract

PURPOSE:To clean a valve in a short tie without necessity of removing it and risking leakage of gas,by connecting a steam feeding pipe for cleaning to a third connecting port of particular flow rate control valve and switchover valve and cleaning the valve to remove tar deposited thereon. CONSTITUTION:A switchover valve 6 equipped with a gas low rate control valve 4 and three connecting ports 5 is interposed between bracching pipe connecting ports 3, 3 of a heating gas main pipe 2 arranged on one side of a lower cellar 1 of a heat storing chamber in a coke oven and branching pipe 7, 7 which have been connected to a riser, for distributing and feeding a heating gas, arranged so as to locate below a series of combustion chambers. When the valves 4, 6 are cleaned, a control valve, e.g., control valve 4 on the right side, into which a heating gas is not fed, is closed. A steam feeding pipe 14 for cleaning, which can be detachably connected through an on-off valve 13 to a cleaning steam main pipe 12 arranged parallel to a main pipe 2, is connected to a third connecting port 5 of a switchover valve 6 on the right side, which has been released into the atmosphere. Steam is fed into the valves 4, 6 to remove tar deposited on the valve 4, 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for cleaning a valve of a heating gas supply device of a coke oven.

(Prior Art) Conventionally, the following devices have been known as heating gas supply devices for coke ovens. That is, the coke oven has a branch pipe connection port for the heating gas wood pipe disposed on one side below the heat storage chamber of the coke oven, and a riser pipe for distributing and supplying the heating gas to each combustion chamber.
Gas flow i; i between branch pipes installed below the heat storage chamber
An mr valve and a gas switching valve are interposed, and the gas switching valve is used to open and close the branch pipe, and the gas flow rate control valve is used to control the gas flow rate. There are known devices that perform T. In this apparatus, tar and the like adhering to the inside of the gas switching valve and gas flow rate control valve were removed in the following manner. That is.

First, close the gas flow rate control valve and remove the gas switching valve, then place a flexible cover with an open bottom end in an airtight manner over the connection port of the gas flow 131m valve to which the gas switching valve was connected. After that, open the gas flow rate control valve, push the cleaning brush housed inside the gas flow rate control valve into the gas flow rate control valve, and move it up and down together with the cover to remove tar, etc. After cleaning the removed gas switching valve, the gas switching valve was reassembled to its original state.

(Disadvantages of conventional technology) The conventional cleaning method has the following drawbacks.

In other words, since the gas switching valve is removed one by one,
The disadvantage is that the work requires time and effort and is accompanied by risks such as gas leakage.

(Object of the Invention) This invention has been made to solve the above-mentioned drawbacks, and is a coke oven that can safely clean the gas switching valve and the gas flow rate control valve without removing the gas switching valve. An object of the present invention is to provide a method for cleaning a valve of a heated gas supply device.

(Example) Embodiments of the invention will be described below with reference to the drawings.

First, an example of a heating gas supply device for a coke oven and a device for carrying out the method of the present invention will be described. As is well known, a heating gas main pipe 2 is disposed on one side of a basement 1 below the heat storage chamber of a coke oven, and a pair of branch pipes are connected to this heating gas main pipe 2 to a combustion chamber group consisting of a large number of combustion chambers. A gas flow control valve 4 is connected to these branch pipe connection ports 3, and these gas flows N7Ar! A gas switching valve 6 having three connection ports 5 is connected to the '1 valve 4, and branch pipes 7 are connected to these gas switching valves 6, and these branch pipes 7 are located below the combustion chamber group. These branch pipes 7 are connected to riser pipes (paths shown) for supplying heated gas to each combustion chamber of the combustion chamber group. With this structure, by operating the gas switching valve 6, when heating gas is being supplied to one branch pipe 7, heating gas is not supplied to the other branch pipe 7, and combustion is performed in the combustion chamber. This is done so that one line is not performed. The combustion chamber where combustion is not occurring is used as an exhaust gas passage for the combustion chamber where combustion is occurring, so that the entire coke oven can have a uniform temperature atmosphere.

The valve body of the gas switching valve 6 has a T-shaped passage, and levers 9 are detachably attached to the square shaft portion of the valve stem 8 that rotates the valve body. So that the mutually paired parts of the whole move left and right at the same time,
It is pivotally connected to a band iron 10 which is connected to a winch and can freely move left and right.

A cleaning steam wood pipe 12 is disposed in parallel with the heating gas main pipe 2, and an on-off valve 13 is provided on this layer air wood pipe 12 in correspondence with the pair of gas switching valves 6. The inlet flange 15 of the gas cleaning steam supply pipe 14 is detachably connected using bolts or the like, and the outlet flange 16 of the steam supply pipe 14 is connected to the gas switching valve 6 using bolts or the like. , so that it can be detachably connected to the third connection port 5 which is open to the atmosphere.

(Example method) Next, a method of cleaning the device will be explained.

After a predetermined period of time has elapsed after cleaning, cleaning will begin. The cleaning is performed on the gas switching valve 6 and gas flow rate control valve 4 connected to the branch pipe 7 to which heating gas is not supplied.
The left branch pipe 7 is supplied with heating gas, and the right branch pipe 7 is not supplied with heating gas, so the gas switching valve 6 and gas flow rate control valve connected to the right branch pipe 7 are 4 cleaning will be done. First, the gas flow N
Close the 7A section valve 4, then remove the lever 9 of the closed gas switching valve 6 on the right side from the valve stem 8 and band iron 1o, connect the outlet flange 16 to the third connection port 5, and open and close the inlet flange 15. Connect to valve 13. After that, the valve stem 8 is rotated to connect the third connection port 5 with the connection port 5 on the gas flow rate control valve 4 side, and then the gas! The amount control valve 4 is opened and the on-off valve 13 is opened to transfer the steam to the gas switching valve 6 and the gas flow rate 2.
11! The gas is supplied to the J valve 4, whereby the gas switching valve 6 and the gas flow remove tar and the like adhering to the control valve 4. Note that, at this time, the gas flow rate three-section valve 4 is fully opened. If the right branch pipe 7 is ready to supply heated gas by the time when the gas switching valve 6 is turned on, the right branch pipe 7 can be switched to the right gas by the operation of the band iron 10. The valve 6 connects the heated gas main pipe 2 and the branch pipe 7, while the left gas switching valve 6 cuts off the supply of heated gas to the branch pipe 7, and the heated gas is supplied to the left branch pipe 7. Once it is gone, the left gas switching valve 6 and gas flow rate three-section valve 4 are cleaned by the same operation as described above.

(Effects of the Invention) As described above, according to the present invention, unlike the conventional case, the gas switching valve 6 is cleaned every time the gas switching valve 6 and the gas flow rate control valve 4 are cleaned.
Since there is no need to remove it, cleaning is extremely easy and there is no risk of heating gas leakage. In addition, since cleaning can be done in a short time, the gas switching valve 6 and the gas flow rate 31 section valve 4 can be cleaned using the period when heating gas is not being supplied, and as a result, the coke oven The operating efficiency of the system can be increased.

[Brief explanation of the drawing]

The drawing is a front view of a main part for explaining the invention in detail. 2... Heating gas wood pipe, 3... Branch pipe connection port, 4...
・Gas flow control valve, 5...Connection port, 6...Gas switching valve.

Claims (1)

[Claims] The coke oven has a branch pipe connection port 3 of a heating gas main pipe 2 arranged on one side below the heat storage chamber, and a riser pipe that distributes and supplies heated gas to each combustion chamber. A coke oven in which a gas flow rate control valve 4 and a gas switching valve 6 having three connection ports 5 are interposed between the branch pipe 7 and the branch pipe 7 are opened and closed by the gas switching valve 6. When cleaning the valves 6 and 4 of the heated gas supply device, closing the gas flow rate control valve 4;
A step of connecting the cleaning steam supply pipe 14 to the connection port open to the atmosphere of the gas switching valve 6, and a step of supplying the cleaning steam to the gas switching valve 6 by operating the gas switching valve 6 and opening the gas flow rate control valve 4. and a step of supplying the gas to the gas flow rate control valve 4 and removing tar and the like from the valves 6 and 4.