JPH065389Y2 - Continuous cutting device for coke dry fire extinguishing equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a process of transporting a lump of coke from a cooling tower in a coke dry-type fire extinguisher equipment to a delivery belt conveyor from an outlet of a granular material of the cooling tower. The present invention relates to a device for continuously cutting out the coke contained in a cooling tower by a rotary valve while preventing combustion.

[Conventional technology]

Coke dry fire extinguishing equipment is used to cool the red hot coke while recovering the sensible heat of the red hot coke extruded from the coke oven. In this equipment, the red hot coke transferred from the coke oven is put into the cooling tower from the top of the oven, and is exchanged with the inert gas for heat exchange.
It is cooled to 200 ℃. Then, the coke after the sensible heat is recovered is cut out from the cooling tower. Here, the inert gas used to recover the sensible heat circulates between the cooling tower and the boiler, and the heat is taken out of the system by the boiler. This inert gas contains a large amount of dust and the like, and may contain a large amount of CO, H _{2 and the} like depending on the operating conditions. Therefore, it is necessary to cut out the massive red hot coke while maintaining the airtightness between the outlet of the cooling tower and the cutting device.

In order to enable continuous discharge of coke while maintaining this airtightness, the present inventors have developed to install a discharge device equipped with a rotary valve in the cooling tower of the coke dry fire extinguishing equipment, and specially designed it. Japanese Patent Application No. 58-46327 (Japanese Patent Laid-Open No. 59-173)
No. 128).

FIG. 2 shows an example of the discharging device introduced in this prior application.
The granular material 3 such as agglomerated coke discharged from the granular material outlet 2 formed in the lower part of the cooling tower 1 is once received by the vibrating feeder 4 and then sent to the rotary valve 5. Here, the vibration feeder 4 is inclined downward toward the rotary valve 5 side and is vibrated by the vibrator 6. Therefore, the powder particles 3 are supplied little by little from the rotor 7 of the rotary valve 5 to the charging space 9 formed between the plurality of radially provided blades 8 while rolling on the vibration feeder 4.

Further, the path of the powder / granule 3 from the powder / granule outlet 2 to the rotary valve 5 is covered with the airtight chamber 10 to prevent outside air from entering. A casing 11 is formed around the rotary valve 5 so as to be continuous with the airtight chamber 10, and the powdery or granular material 3 fed into the charging space 9 from the supply port 12 is accompanied by the rotation of the rotary valve 5. Is conveyed in the rotary valve 5 in a closed state and falls on the payout belt conveyor 13.

Thus, by incorporating the rotary valve 5 between the powder and granular material outlet 2 and the delivery belt conveyor 13 and surrounding the periphery thereof with the airtight chamber 10 and the casing 11, the powder and granular material 3 can be maintained while maintaining airtightness. It has become possible to continuously cut out from the cooling tower 1.

In order to maintain this continuous cutting out under stable conditions for a long time, it is necessary to keep the rotor 7, which is the rotating part of the rotary valve 5, in a clean atmosphere. However, a large amount of dust floats in the inert gas sent out from the powder outlet 2 of the cooling tower 1 together with the powder 3, and this dust is present in the space between the side surface of the rotary valve 5 and the casing 11. It easily flows in and easily adheres to the rotor 7 of the rotary valve 5. Also,
The coke itself may fall into this space, which impedes the rotation of the rotary valve 5.

In order to prevent dust and coke from flowing between the side surface of the rotary valve 5 and the casing 11, the present inventors have developed a side surface seal mechanism for a rotary valve having an air purge function as shown in FIG. Developed this
Introduced in issue 59-50811. That is, the seal ring 16 is pressed against the side plate 14 of the rotary valve 5 by the spring 15, and the space 17 between the side plate 14 and the casing 11 is sealed by a so-called mechanical seal. As a result, coke having a relatively large grain size is prevented from adhering to the rotor 7 of the rotary valve 5.

However, when the pressure in the closed space 17 is lower than the pressure in the airtight chamber 10, the inert gas from the powder or granular material outlet 2 or the air from the discharging belt conveyor 13 flows into the closed space 17 due to the pressure difference. . The dust floating in the inflowing gas is apt to adhere to the seal ring 16 and the rotor 7, which deteriorates the sealing performance of the mechanical seal and the rotary valve 5
It becomes a factor to hinder the rotation of. Therefore, in order to prevent the inflow of this gas, the opening 18 provided in a part of the casing 11 is provided.
The internal pressure of the closed space 17 is increased by blowing compressed air or the like into the closed space 17 from.

[Problems to be solved by the invention]

The reason why compressed air is selected as the gas to be blown to increase the internal pressure of the closed space 17 is that it is easily available and inexpensive. However, the blown air flows into the airtight chamber 10 between the seal ring 16 and the side plate 14 to increase the oxygen concentration of the atmospheric gas. This atmosphere gas contains combustible components such as CO and H ₂ generated from the red hot coke during heat exchange with the red hot coke in the cooling tower 1. The content of this combustible component varies depending on the operating state of the cooling tower 1. Therefore, when air flows into the atmospheric gas having a high concentration of combustible components from the closed space 17, a combustion reaction may occur in the airtight chamber 10.

By this combustion, equipment such as the rotary valve 5 is heated to a high temperature, and seizure is likely to occur particularly in the drive unit and the like. This combustion may also occur explosively, and the impact at this time damages the parts. Therefore, the durability of the device deteriorates, and it is required to replace the parts in a short time.

Therefore, in the present invention, by improving the inflow prevention of dust and coke due to the gas injection, continuous cutting is performed while preventing combustion in the transport path from the powder outlet of the cooling tower to the delivery belt conveyor. The purpose is to do.

[Means for solving problems]

The present invention relates to a cutting device for a coke dry fire extinguishing system in which a casing is formed between a powder particle outlet provided at a lower part of a cooling tower and an inlet of a rotary valve to form a closed space. A space is formed between the casings facing each other, a gas blowing hole is provided in a part of the casing, and an air supply source and an inert gas supply source are provided through a conduit provided with a switching valve. It is a continuous cutting device for coke dry fire extinguishing equipment, characterized in that it is connected to an insertion hole.

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a state in which the cutting device of the embodiment of the present invention is installed in the lower part of the cooling tower of the coke dry fire extinguishing equipment. In addition,
In FIG. 1, parts corresponding to the members shown in FIG. 2 are designated by the same reference numerals.

The granular material 3 in the cooling tower 1 is sent to the rotary valve 5 via the vibration feeder 4 vibrated by the vibrator 6 as in the case of FIG. Since the vibration feeder 4 is configured as a part of the wall portion of the airtight chamber 10, the vibration feeder 4 is stretchable between the vibration feeder 4 and the casing 11 so that the vibration of the vibration feeder 4 is not directly transmitted to the rotary valve 5. The joint portion 19 of is interposed. Similarly, elastic joint portions 19 are provided between the lower portion of the cooling tower 1 and the vibrating feeder 4, and between the wall 10a of the airtight chamber 10 and the lower portion of the cooling tower 1 and the casing 11. Further, a slide gate 20 is attached to the powder / particle outlet 2, and by moving the slide gate 20 forward and backward, the unloading of the powder or granular material is stopped.
In addition, maintenance of the vibration feeder 4, the rotary valve 5 and the expansion joint 19 is carried out by preventing the inert gas from flowing down from the furnace.

An opening 18 is formed in the surface of the casing 11 facing the side plate (not shown) of the rotary valve 5 as in the case of FIG. The gas supply conduit 21 connected to the opening 18 is connected to the compressed air supply source 23 and the inert gas supply source 24 via the switching valve 22. Therefore, by operating the switching valve 22, either compressed air or an inert gas is blown between the side surface of the rotary valve 5 and the casing 11. For example, in steady state
Compressed air is blown from 18 and the inert gas is blown from the opening 18 when the atmospheric gas in the hermetic chamber 10 contains a large amount of unburned components such as CO and H ₂ .

The switching valve 22 is operated by analyzing the atmospheric gas in the airtight chamber 10,
It is preferable to carry out based on the analysis result. In the example of FIG. 1, for this purpose, the gas sampling pipe 25 is made to face the inside of the hermetic chamber 10, and the atmospheric gas sampled by the gas sampling pipe 25 is analyzed by the gas analyzer 26. Then, the analysis result obtained by the gas analyzer 26 is input to the calculator 27, and the calculation result is compared with the reference value already input to the calculator 27. Then, when the calculation result that the unburned component content of the atmospheric gas is high is obtained, the switching signal 28 is output from the calculator 27 to the switching valve 22, and the inert gas supply source 24 is connected to the gas supply conduit 21. Connect to.
Therefore, the inert gas is supplied from the opening 18 to the space between the side portion of the rotary valve 5 and the casing 11.

The blown-in inert gas flows out from the side portion of the rotary valve 5 to the airtight chamber 10 and the payout belt conveyor 13 side, and dilutes the unburned components of the atmospheric gas. As a result, the combustion of the atmospheric gas is suppressed during the transportation process from the powdery or granular material outlet 2 of the cooling tower 1 to the payout belt conveyor 13.

Further, in this embodiment, a step portion 29 is formed in the middle of the casing 11 on the outlet side of the rotary valve 5, and the granular material 3 that falls from the charging space 9 as the rotary valve 5 rotates.
I'm taking it here once. Then, when the powder particles 3 are deposited on the step portion 29 at an angle of repose or more, the powder particles 3 are dropped onto the payout belt conveyor 13. As described above, once the powdery particles 3 are received by the step portion 29, the impact of the powdery particles 3 falling onto the payout belt conveyor 13 is mitigated, the payout belt conveyor 13 is protected, and the amount of dust generated Can be reduced. Therefore, the amount of dust entering the space between the side portion of the rotary valve 5 and the casing 11 can be reduced.

[Effect of device]

As described above, in the present invention, the gas blown between the side portion of the rotary valve and the casing is
Compressed air is used at normal times, and is used as an inert gas when the concentration of unburned components in the atmospheric gas is high during the transportation process from the powder and granular material outlet of the cooling tower to the delivery belt conveyor. As a result, it becomes possible to cut out the block coke and the like continuously while reliably and economically preventing the ingress of dust that tends to adhere to the rotary portion of the rotary valve.

[Brief description of drawings]

FIG. 1 is a view for explaining an embodiment of the present invention,
On the other hand, FIG. 2 and FIG. 3 respectively show a continuous cutting device developed by the present inventors and a sealing mechanism in the device.

Front page continuation (72) Creator Yoshizo Ogino 59 59 Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture 59 Nippon Steel Co., Ltd. Tobata Plant Manufacturing Co., Ltd. (56) References: 59-157446 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cutting device for a coke dry fire extinguishing facility in which a sealed space is formed by covering a space between an outlet of a granular material provided at a lower part of a cooling tower and an inlet of a rotary valve with a side surface of the rotary valve. A space is formed between the casings opposed to this, a gas blowing hole is provided in a part of the casing, and an air supply source and an inert gas supply source are provided through a conduit provided with a switching valve. A continuous cutting device for coke dry fire extinguishing equipment, characterized by being connected to a blow hole.