CN113324254A - Waste heat recovery slag discharging equipment and method for garbage fly ash plasma furnace belt - Google Patents
Waste heat recovery slag discharging equipment and method for garbage fly ash plasma furnace belt Download PDFInfo
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- CN113324254A CN113324254A CN202110757037.9A CN202110757037A CN113324254A CN 113324254 A CN113324254 A CN 113324254A CN 202110757037 A CN202110757037 A CN 202110757037A CN 113324254 A CN113324254 A CN 113324254A
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- slag
- cooling
- pool
- cooling table
- heat recovery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention belongs to the technical field of slag discharging equipment, and particularly relates to waste heat recovery slag discharging equipment and a waste heat recovery slag discharging method for a garbage fly ash plasma furnace, wherein the waste heat recovery slag discharging equipment comprises a pre-cooling table, a slag cooling pool, a slag material conveying device and a frame body, wherein the pre-cooling table is rotatably connected with the frame body, and is connected with a driving mechanism, and the pre-cooling table is driven to rotate by the driving mechanism; a sealing cover is fixed above the pre-cooling table, the sealing cover is rotationally connected with the pre-cooling table, a scraping plate is arranged in the sealing cover, and the cold slag pool is positioned below the pre-cooling table and is fixedly connected with the frame body; the slag conveying device is fixedly connected with the cold slag pool, and the materials in the cold slag pool can be discharged or discharged onto the pre-cooling platform through the slag conveying device; the slag on the pre-cooling platform is scraped into the slag cooling pool through a scraper, and a slag inlet is arranged on the sealing cover. The equipment prevents that the high temperature melt from consolidating on equipment when the melt cools off, can realize the cooling of slagging tap in succession, and cooling temperature is controllable, has waste heat recovery device, and the energy consumption is low, advantage that the water consumption is low.
Description
Technical Field
The invention belongs to the technical field of slag discharging equipment, and particularly relates to waste heat recovery slag discharging equipment and method for a garbage fly ash plasma furnace.
Background
The domestic waste incineration technology has the advantages of high treatment speed, easy pollution prevention and control, high technical reliability, easy project implementation and the like, and is rapidly developed in the last two years. In 2018, the proportion of garbage incineration is more than 30%, namely 'annual survey of urban construction statistics in 2018', and the garbage incineration rapidly develops, so that a large amount of garbage fly ash is generated in nearly two years. Because the garbage flying ash contains more toxic and corrosive substances such as heavy metal, dioxin and the like, the harmless disposal of the garbage flying ash becomes one of the difficulties of the household garbage incineration technology.
The high-temperature plasma furnace is used for treating the waste incineration fly ash, the advantages of high temperature, high energy density, low oxidation atmosphere and the like of a plasma torch are utilized to generate 1600 ℃ high temperature in the furnace, toxic substances in the waste incineration fly ash are thoroughly decomposed and gasified into combustible synthetic gas, inorganic substances are melted into glass state substances at high temperature and recycled, the high-temperature plasma furnace has the advantages of thorough harmless treatment and resource utilization, the high-temperature plasma furnace is a better mode for treating the waste incineration fly ash at present, but in order to ensure continuous discharging, the temperature of bottom slag of the high-temperature plasma furnace is required to be kept above 1200 ℃, so that a set of continuous and stable high-temperature slag discharging system which can recover the heat and can ensure non-blockage is designed to be particularly important.
Some plasma furnace high temperature slag tapping devices are disclosed in the prior patent documents, such as: the patent application No. CN200310113485.7 discloses a method for plasma-enhanced cracking of organic waste and a plasma furnace; a plasma apparatus for treating medical waste disclosed in patent application No. CN 201811325471.4; the patent application number is CN201811325676 discloses a plasma device for treating oil sludge; the slag liquid is directly discharged into the water cooling tank in the device, the water consumption of the slag cooling 10 mode is large, and the cooling speed cannot be controlled.
The patent application No. CN202011388864.7 discloses a continuous slag discharging device and a continuous slag discharging method of a plasma furnace, which can realize the requirement of continuous slag discharging to a certain extent; the scheme has no pre-cooling section and waste heat recovery device, and the problem of high water consumption still exists when the molten mass is directly put into cooling liquid.
Disclosure of Invention
Aiming at the technical problems, the invention provides a device and a method for waste heat recovery and slag tapping of a garbage fly ash plasma furnace belt, which can realize continuous slag tapping and reduce energy consumption.
In order to solve the technical problems, the invention adopts the technical scheme that:
a waste heat recovery slag discharging device for a garbage fly ash plasma furnace comprises a pre-cooling table, a cold slag pool, a slag material conveying device and a frame body, wherein the pre-cooling table is rotatably connected with the frame body, and is connected with a driving mechanism, and the pre-cooling table is driven to rotate by the driving mechanism;
a sealing cover is fixed above the pre-cooling table, the sealing cover is rotationally connected with the pre-cooling table, a scraping plate is arranged in the sealing cover, and the cold slag pool is positioned below the pre-cooling table and is fixedly connected with the frame body;
the slag conveying device is fixedly connected with the cold slag pool, one end of the slag conveying device can extend out through the pre-cooling table, and the slag conveying device can discharge materials in the cold slag pool or discharge the materials to the pre-cooling table;
and the slag on the pre-cooling table is scraped into the slag cooling pool through a scraper, and the sealing cover is provided with a slag inlet.
The driving mechanism comprises a driving motor and a transmission mechanism, the driving motor is connected with the pre-cooling table through the transmission mechanism, and the pre-cooling table is connected with the frame body through a second bearing.
The transmission mechanism adopts a chain transmission mechanism, and corresponding chain teeth are arranged outside the pre-cooling table.
And a discharging device is arranged on the slag conveying device, and the slag on the slag conveying device is discharged onto the pre-cooling platform through the discharging device.
The discharging device is a control valve arranged on the slag conveying device; the slag charge conveying device adopts a spiral material lifting device or a chain type scraper conveyor.
The sealing cover is provided with a steam release port, a lifting lug and a water filling port.
The cold slag pool is of a hollow structure, and a water outlet and a water return port which are communicated with the hollow structure of the cold slag pool are arranged on the cold slag pool.
And the sealing cover is provided with a cutting device.
A method for removing slag, which comprises the following steps,
discharging a part of materials in the cold slag pool onto a pre-cooling table through a slag material conveying device, and forming a cold slag backing material protective layer on the upper surface of the pre-cooling table; discharging the other part of the material in the cold slag pool through a slag conveying device;
high-temperature molten mass in the garbage fly ash plasma furnace is discharged to a cold slag bottom material protective layer through a slag inlet on a sealing cover for primary cooling, and the molten mass after primary cooling is pushed to a cold slag pool through a scraper for continuous cooling.
During primary cooling, the pre-cooling table is in a rotating state.
Compared with the prior art, the invention has the following beneficial effects:
discharging a part of materials in the cold slag pool onto a pre-cooling table through a slag material conveying device, forming a cold slag backing material protective layer on the upper surface of the pre-cooling table, and primarily cooling a melt on the cooling table and then discharging the melt into water in the cold slag pool for water cooling; therefore, through the structure, the high-temperature melt can not be solidified on the equipment, and the continuous slag discharging and cooling can be realized. And has the advantages of low energy consumption and low water consumption.
A cutting device is arranged, and the basically cooled melt can be basically cut into small blocks through the cutting device.
The cold slag pool is of a hollow structure, and is provided with a water outlet and a water return port which are communicated with the hollow structure; the waste heat recovery can be realized, and the device can be protected.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic view of the operational state of the present invention;
FIG. 3 is a schematic diagram of the construction of the control valve of the present invention;
FIG. 4 is a schematic structural view of the blanking device of the present invention;
wherein: the device comprises a pre-cooling platform 1, a first bearing 2, a sealing cover 3, a steam vent 4, a lifting lug 5, a water filling port 6, a slag inlet 7, a slag conveying device 8, hot slag 9, cold slag 10, a water outlet 11, a hollow structure 12, a water return port 13, a cold slag pool 14, a scraper 15, a control valve 16, a material cutting device 17, a second bearing 18, a driving motor 19, a transmission mechanism 20 and a frame body 21.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the waste heat recovery slag discharging device for the garbage fly ash plasma furnace comprises a pre-cooling table 1, a cold slag pool 14, a slag material conveying device 8 and a frame body 21, wherein the pre-cooling table 1 is rotatably connected with the frame body 21, the pre-cooling table 1 is connected with a driving mechanism, and the pre-cooling table 1 is driven to rotate by the driving mechanism;
a sealing cover 3 is fixed above the pre-cooling table 1, the sealing cover 3 is rotatably connected with the pre-cooling table 1, a scraping plate 15 is arranged in the sealing cover 3, and a slag cooling pool 14 is positioned below the pre-cooling table 1 and is fixedly connected with a frame body 21;
the slag conveying device 8 is fixedly connected with the cold slag pool 14, one end of the slag conveying device 8 can extend out through the pre-cooling platform 1, and the slag conveying device 8 can discharge the materials in the cold slag pool 14 to the pre-cooling platform 1; the slag on the pre-cooling platform 1 is scraped into the slag cooling pool 14 through a scraping plate 15, and a slag inlet 7 is arranged on the sealing cover 3.
When in use, the slag material conveying device 8 conveys and transfers cooling slag with the temperature of less than 100 ℃ from the cold slag pool 14 and discharges the cooling slag to the pre-cooling platform 1, so that a layer of cold slag 10 is formed on the pre-cooling platform 1 and is used for protecting equipment and preventing a high-temperature molten mass from being solidified on the equipment; the high-temperature molten mass (hot slag 9) in the garbage fly ash plasma furnace is discharged onto the cold slag 10 of the pre-cooling platform 1 through the slag inlet 7.
The pre-cooling table 1 is driven to rotate by a driving mechanism, and the rotating speed is determined by the cooling temperature and the slag discharge amount; when the slag material is transferred to the scraper 15, the slag material (after primary cooling) on the pre-cooling table 1 is scraped into the cold slag pool 14 through the scraper 15, and then is continuously cooled through water (cooling liquid) in the cold slag pool 14; after cooling, the slag is discharged through the slag conveying device 8 and can be discharged into a slag transport vehicle.
Therefore, this equipment operation mode is the refrigerated wet sediment of one deck (cold sediment) of tiling on the precooling platform 1 of equipment, play the cooling and prevent that the high temperature melt from consolidating on the equipment, the effect of protection equipment, then the high temperature melt sediment that flows out from the plasma stove, through going into slag notch 7 to dropping to on the wet sediment, the in-process melt constantly cools off along with the equipment main part rotation, then rotate to scraper blade 15 department, adopt scraper blade 15 to scrape the sediment and cool off to the aquatic, adopt slag charge conveyor 8 to promote the sediment after the cooling, use the cloth sediment device with the even one deck cooling sediment of laying on the cooling platform, all the other direct discharges, constantly circulate like this, guarantee to go on in succession.
Specifically, the method comprises the following steps: how to fix the sealing cover can be fixed with the frame body 21 or with the wall body or by suspension, and whatever means is adopted, the sealing cover can be fixed above the pre-cooling table 1. The sealing cover 3 and the pre-cooling table 1 can be rotationally connected through a first bearing 2; the first bearing is preferably a flat bearing.
When the pre-cooling table 1 rotates, the cold slag pool 14 and the sealing cover 3 are both in a static (fixed) state.
Further, the driving mechanism comprises a driving motor 19 and a transmission mechanism 20, the driving motor 19 is connected with the pre-cooling table 1 through the transmission mechanism 20, and the pre-cooling table 1 is connected with the frame body 21 through the second bearing 18; the shell of the driving motor 19 is fixed on the frame body 21, the pre-cooling table 1 is driven to rotate through the driving motor 19, the driving motor 19 can adopt a variable frequency motor, and the rotating speed is determined through the slag discharging temperature and the slag discharging amount.
Further, the transmission mechanism 20 is a chain transmission mechanism, corresponding chain teeth are arranged outside the pre-cooling table 1, a chain wheel in the chain transmission is connected with an output shaft of the driving motor 19, and the chain wheel is connected with the chain teeth through a chain.
Of course, the transmission mechanism 20 may be other conventional transmission mechanisms such as a gear transmission mechanism.
Further, a discharging device is arranged on the slag conveying device 8, and the slag on the slag conveying device 8 is discharged onto the pre-cooling table 1 through the discharging device.
Further, as shown in fig. 3, the discharging device is a control valve 16 arranged on the slag conveying device 8; the slag material conveying device 8 adopts a spiral material lifting device or a chain scraper conveyor.
The slag on the slag conveying device 8 can fall onto the pre-cooling table 1 by opening the control valve 16; when the control valve 16 is closed, the slag on the slag conveyor 8 can be discharged from one end thereof.
Specifically, the method comprises the following steps: the control valve 16 can adopt a common gate valve and the like, for example, a chain scraper conveyor is taken as an example, the control valve 16 is arranged on a chute (the chute is provided with corresponding connecting through holes), when the chute is closed, materials can be discharged through one end of the chain scraper conveyor, and after the chute is opened, the materials can leak to the pre-cooling platform 1 through the control valve.
Of course, other structures may be substituted by those skilled in the art, such as; the chute is provided with a movable baffle, the baffle is connected with an oil cylinder in a sliding manner, and the baffle is driven to move through the expansion of the oil cylinder. When the baffle moves, a gap is formed between the baffle and the chute, and materials can fall onto the pre-cooling table 1 through the gap; the baffle moves in the reverse direction, is attached to the chute to block the gap, and materials can be discharged through one end of the chain type scraper conveyor.
Further, the sealing cover 3 is provided with a steam release port 4, a lifting lug 5 and a water filling port 6. The steam generated in the steam discharging port 4 can be discharged; the sealing cover 3 can be conveniently opened or fixed through the lifting lug 5, so that the equipment is convenient to maintain; the water filling port 6 is arranged to conveniently fill water into the cold slag pool 14.
Further, the cold slag pool 14 is a hollow structure 12, and a water outlet 11 and a water return port 13 which are communicated with the hollow structure 12 are arranged on the cold slag pool 14; be equipped with the cooling water in hollow structure 12, can realize the circulation of cooling water through delivery port 11 and return water mouth 13, absorb the heat that cold slag bath 14 produced to realize the recycle of waste heat, specifically can be with its connection garbage power factory steam-water system heat exchange equipment such as.
Further, as shown in fig. 4, the sealing cover 3 is provided with a cutting device 17, and the slag can be cut into small pieces by the cutting device 17.
The blanking device 17 may be a spiral cutting device or a mechanical cutting device as is common in the art. The spiral blade is connected with an output shaft of the motor, and a shell of the motor is fixed on the sealing cover 3; the motor drives the spiral blade to rotate to realize cutting. At the same time, the screw blade can be rotatably connected with the sealing cover 3.
Meanwhile, the blanking devices 17 can be arranged in a plurality as required, and the plurality of blanking devices 17 are arranged side by side.
A method for removing slag, which comprises the following steps,
discharging a part of materials in the cold slag pool onto a pre-cooling table through a slag material conveying device, and forming a cold slag backing material protective layer on the upper surface of the pre-cooling table; discharging the other part of the material in the cold slag pool through a slag conveying device;
high-temperature molten mass in the garbage fly ash plasma furnace is discharged to a cold slag bottom material protective layer through a slag inlet on a sealing cover for primary cooling, and the molten mass after primary cooling is pushed to a cold slag pool through a scraper for continuous cooling.
During primary cooling, the pre-cooling table is in a rotating state.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.
Claims (10)
1. The utility model provides a be used for rubbish flying dust plasma furnace to take waste heat recovery slag discharging equipment which characterized in that: the slag cooling device comprises a pre-cooling table (1), a slag cooling pool (14), a slag conveying device (8) and a frame body (21), wherein the pre-cooling table (1) is rotatably connected with the frame body (21), the pre-cooling table (1) is connected with a driving mechanism, and the pre-cooling table (1) is driven to rotate by the driving mechanism;
a sealing cover (3) is fixed above the pre-cooling table (1), the sealing cover (3) is rotatably connected with the pre-cooling table (1), a scraping plate (15) is arranged in the sealing cover (3), and a cold slag pool (14) is positioned below the pre-cooling table (1) and is fixedly connected with a frame body (21);
the slag conveying device (8) is fixedly connected with the cold slag pool (14), one end of the slag conveying device (8) can penetrate through the pre-cooling platform (1) to extend out, and materials in the cold slag pool (14) can be discharged or discharged onto the pre-cooling platform (1) through the slag conveying device (8);
slag on the pre-cooling table (1) is scraped into a cold slag pool (14) through a scraper (15), and a slag inlet (7) is formed in the sealing cover (3).
2. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: the driving mechanism comprises a driving motor (19) and a transmission mechanism (20), the driving motor (19) is connected with the pre-cooling table (1) through the transmission mechanism (20), and the pre-cooling table (1) is connected with the frame body (21) through a second bearing (18).
3. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 2, characterized in that: the transmission mechanism (20) adopts a chain transmission mechanism, and corresponding chain teeth are arranged outside the pre-cooling table (1).
4. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: and a discharging device is arranged on the slag conveying device (8), and the slag on the slag conveying device (8) is discharged onto the pre-cooling platform (1) through the discharging device.
5. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: the discharging device is a control valve (16) arranged on the slag conveying device (8); the slag charge conveying device (8) adopts a spiral material lifting device or a chain scraper conveyor.
6. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: the sealing cover (3) is provided with a steam release port (4), a lifting lug (5) and a water filling port (6).
7. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: the slag cooling tank (14) is of a hollow structure (12), and a water outlet (11) and a water return port (13) which are communicated with the hollow structure (12) of the slag cooling tank (14) are arranged on the slag cooling tank (14).
8. The waste heat recovery slag tapping device for the waste fly ash plasma furnace belt according to claim 1, characterized in that: and a cutting device (17) is arranged on the sealing cover (3).
9. A tapping method in a tapping plant according to claim 1, characterized in that:
discharging a part of materials in the cold slag pool onto a pre-cooling table through a slag material conveying device, and forming a cold slag backing material protective layer on the upper surface of the pre-cooling table; discharging the other part of the material in the cold slag pool through a slag conveying device;
high-temperature molten mass in the garbage fly ash plasma furnace is discharged to a cold slag bottom material protective layer through a slag inlet on a sealing cover for primary cooling, and the molten mass after primary cooling is pushed to a cold slag pool through a scraper for continuous cooling.
10. A tapping method in a tapping plant according to claim 9, characterized in that: during primary cooling, the pre-cooling table is in a rotating state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110757037.9A CN113324254A (en) | 2021-07-05 | 2021-07-05 | Waste heat recovery slag discharging equipment and method for garbage fly ash plasma furnace belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110757037.9A CN113324254A (en) | 2021-07-05 | 2021-07-05 | Waste heat recovery slag discharging equipment and method for garbage fly ash plasma furnace belt |
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| CN113324254A true CN113324254A (en) | 2021-08-31 |
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| CN202110757037.9A Pending CN113324254A (en) | 2021-07-05 | 2021-07-05 | Waste heat recovery slag discharging equipment and method for garbage fly ash plasma furnace belt |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757704A (en) * | 2021-10-14 | 2021-12-07 | 河南中电投华新电力工程有限公司 | Slag leakage recovery structure for slag cooler |
| CN114590607A (en) * | 2022-03-09 | 2022-06-07 | 上海电气集团股份有限公司 | Slag discharging system for high-temperature ash and use method thereof |
| CN116557886A (en) * | 2023-07-12 | 2023-08-08 | 江苏大恒环境技术有限公司 | Shaft tube sealing device for preventing heat leakage of slag hole |
-
2021
- 2021-07-05 CN CN202110757037.9A patent/CN113324254A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757704A (en) * | 2021-10-14 | 2021-12-07 | 河南中电投华新电力工程有限公司 | Slag leakage recovery structure for slag cooler |
| CN114590607A (en) * | 2022-03-09 | 2022-06-07 | 上海电气集团股份有限公司 | Slag discharging system for high-temperature ash and use method thereof |
| CN114590607B (en) * | 2022-03-09 | 2024-03-19 | 上海电气集团股份有限公司 | Slag discharging system for high-temperature ash and using method thereof |
| CN116557886A (en) * | 2023-07-12 | 2023-08-08 | 江苏大恒环境技术有限公司 | Shaft tube sealing device for preventing heat leakage of slag hole |
| CN116557886B (en) * | 2023-07-12 | 2023-09-15 | 江苏大恒环境技术有限公司 | Shaft tube sealing device for preventing heat leakage of slag hole |
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