CN108178158B

CN108178158B - Straight-groove type resistance furnace capable of collecting waste gas and preventing explosion

Info

Publication number: CN108178158B
Application number: CN201810057064.3A
Authority: CN
Inventors: 贾玉东
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-11-28
Filing date: 2018-01-22
Publication date: 2022-11-01
Anticipated expiration: 2038-01-22
Also published as: CN108178158A

Abstract

The utility model provides a collect waste gas and straight flute type resistance furnace that can blast proof, includes the furnace shaft, furnace end, waste gas collection device and the waste gas guide plate with ground contact. Waste gas collection device sets up in the shaft top, the waste gas guide plate sets up the both sides at the shaft, there is the clearance between waste gas guide plate and the shaft, the air admission passageway that supplies the outside air to get into has between waste gas guide plate and the ground, the waste gas guide plate is used for blockking the flue gas that produces in the shaft to shaft both sides diffusion, and guide flue gas and the air that gets into from waste gas guide plate bottom flow to waste gas collection device, waste gas collection device is used for carrying the flue gas to shaft top diffusion and the flue gas of waste gas guide plate guide and air after collecting and handles for external flue gas processing apparatus, the clearance has between waste gas collection device and the shaft, when the atmospheric pressure in the region that waste gas collection device and waste gas guide plate enclose increases suddenly, utilize the flue gas that the clearance release increases in order to reduce atmospheric pressure.

Description

Straight-groove type resistance furnace capable of collecting waste gas and preventing explosion

Technical Field

The invention relates to the technical field of smelting equipment, in particular to a straight-groove type resistance furnace capable of collecting waste gas and preventing explosion.

Background

At present, when a straight-tank resistance furnace is used for smelting silicon carbide products and graphitized coke products, a large amount of carbon monoxide gas and sulfur vapor are generated, and volatile combustible gas discharged from a carbon material is discharged from the smelting furnace to the outside and is combusted on the surface of the furnace, so that mixed flue gas containing a large amount of carbon dioxide and unburned carbon monoxide, sulfur dioxide and nitrogen dioxide is generated.

In view of the above technical problems, the prior art provides a corresponding solution, for example, patent No. 2007101293404, a chinese invention patent entitled silicon carbide smelting furnace capable of recovering smelting waste gas provides a technical solution: the furnace body consists of a furnace end, a furnace bottom and electrodes, furnace walls are arranged on two sides of the furnace body and are air-tight, the furnace walls, the furnace end and the furnace bottom form a straight groove shape, a furnace cover is arranged on the furnace walls, the furnace end, the furnace bottom, the furnace walls and the furnace cover form a closed space in the furnace body, and a plurality of gas collecting pipes are arranged to be communicated with the inside and the outside of the furnace body, so that the purposes of collecting, discharging and utilizing smelting waste gas are achieved;and then as patent application number 2016105541506, the invention creates the technical scheme that is provided by the Chinese invention patent application named as the silicon carbide smelting waste gas collecting and purifying device: the silicon carbide smelting furnace is arranged in the gas collecting hood, one end of the gas collecting hood is communicated with a recovery pipeline system, the recovery pipeline system is communicated with a desulfurization and purification system through a pipeline, the desulfurization and purification system is communicated with an exhaust fan through a pipeline, and the exhaust fan is communicated with a gas storage device through a pipeline; the gas collecting hood consists of a lower hood body and an upper hood body, the lower hood body and the upper hood body are horizontally superposed, second water sealing grooves are arranged between the lower hood body and the upper hood body and between the lower hood body and the bottom surface, a pressure relief sealing device is arranged at the top of the upper hood body, and the gas collecting hood adopts a fully-closed gas collecting hood for collection₂And S, the collected CO can be directly recycled without being treated.

However, the above prior art has the following technical problems: because the prior art adopts the idea of full-sealing technology to ensure the smooth collection of waste gas, the dimensional precision and the installation precision of the equipment are required to meet certain standards, and the precision equipment is not suitable for industrialized silicon carbide smelting production and cannot be popularized; furthermore, the above-mentioned prior art applying the concept of the fully-sealed technology has a safety risk, for example, when the "furnace head, furnace bottom, furnace wall and furnace cover form a closed space inside the furnace body" or the "fully-sealed gas-collecting hood of the silicon carbide smelting furnace" is not discharged in time due to internal failure, an explosion accident may occur.

Disclosure of Invention

In view of the above, it is desirable to provide a straight-trough resistance furnace that collects exhaust gases and is explosion-proof.

Above-mentioned collect waste gas and can explosion-proof straight flute type resistance furnace, waste gas collection device sets up in furnace shaft top and waste gas collection device establish and have the clearance between the furnace shaft, the waste gas guide plate sets up the both sides at the furnace shaft, there is the clearance between waste gas guide plate and the furnace shaft, so constitute a flue gas drainage channel that is used for guiding the inside produced flue gas of furnace shaft to arrive waste gas collection device smoothly, simultaneously when waste gas collection device can not in time be with the flue gas discharge of sudden increase, utilize the flue gas of clearance release increase, realize the interim evacuation of flue gas, and then avoid explosion accident to take place, and the aforesaid collects waste gas and the size precision of straight flute type resistance furnace that can explosion-proof, the installation accuracy requirement is not high, adapt to the silicon carbide smelting production demand of industrialization, so can extensively promote.

Drawings

FIG. 1 is a schematic view of a straight-trough resistance furnace for collecting exhaust gas and preventing explosion in accordance with a preferred embodiment.

FIG. 2 is a schematic sectional view of a straight-channel type resistance furnace which collects exhaust gas and is explosion-proof.

Fig. 3 is a schematic view of the connection structure of the telescopic socket and the telescopic socket.

In the figure: the straight groove type resistance furnace 10 capable of collecting waste gas and preventing explosion, a furnace body 20, a movable side wall 21, a channel steel frame 210, a ventilating wall 211, a furnace core 22, a furnace end 30, a waste gas collecting device 40, a covering cover 41, a first transverse plate 410, a second transverse plate 411, a third transverse plate 412, a side plate 413, a supporting part 414, a vertical reinforcing rib 415, a transverse reinforcing rib 416, a gas collecting pipe 42, a flue gas inlet hole 420, a fan 43, a spraying cooling pipeline 44, a telescopic sleeving part 45, a second insulating layer 46, a waste gas guide plate 50, a flue gas blocking plate 51, a guiding flow distribution plate 52, a pressure opening type sealing curtain 60, a first insulating cushion layer 70 and a safety explosion-proof window 80.

Detailed Description

Referring to fig. 1 to 3, the explosion-proof straight-groove type resistance furnace 10 for collecting exhaust gas includes a furnace body 20 contacting with the ground, a furnace head 30, an exhaust gas collecting device 40, and an exhaust gas guide plate 50. The waste gas collecting device 40 is arranged above the furnace body 20, the waste gas guide plates 50 are arranged on two sides of the furnace body 20, a gap is formed between the waste gas guide plates 50 and the furnace body 20, an air inlet channel for allowing outside air to enter is formed between the waste gas guide plates 50 and the ground, the waste gas guide plates 50 are used for preventing smoke generated in the furnace body 20 from diffusing towards two sides of the furnace body 20 and guiding the smoke and air entering from the bottom of the waste gas guide plates 50 to flow towards the waste gas collecting device 40, wherein the smoke generated in the furnace body 20 mainly comprises carbon monoxide, and the waste gas collecting device 40 is used for collecting the smoke diffusing towards the upper part of the furnace body 20 and the smoke and air guided by the waste gas guide plates 50 and then conveying the collected smoke and air to the outside smoke treatment device for treatment; a gap is formed between the waste gas collecting device 40 and the furnace body 20, and when the waste gas collecting device 40 collects the flue gas, external air can enter from the gap, so that the flue gas is collected more smoothly by the waste gas collecting device 40; when the gas pressure in the area enclosed by the waste gas collecting device 40 and the waste gas guide plate 50 is suddenly increased, for example, the smoke generated in the furnace 20 is greatly increased and the new smoke is suddenly increased due to oxidation in the area enclosed by the waste gas collecting device 40, the increased smoke is released by the gap to reduce the gas pressure. The air inlet passage may be formed by: for example, the height of the exhaust gas baffle 50 is less than the height of the furnace shell 20 and the exhaust gas baffle 50 does not contact the ground, so there is a gap between the exhaust gas baffle 50 and the ground; in other embodiments, the height of the exhaust gas baffle 50 is not limited by the height of the furnace 20, and a through hole for the external air to enter may be formed at the lower portion of the exhaust gas baffle 50.

In the present embodiment, a pressure-openable sealing curtain 60 is disposed between the exhaust gas collecting device 40 and the exhaust gas guide plate 50, and the pressure-openable sealing curtain 60 is used for opening when the pressure in the region enclosed by the exhaust gas collecting device 40 and the exhaust gas guide plate 50 is greater than its own pressure-bearing value, so as to release the collected flue gas. When the exhaust gas collecting device 40 can not discharge the flue gas in time, the pressure-opening sealing curtain 60 is pushed by the flue gas with increased pressure to open, and meanwhile, under the guidance of the exhaust gas guide plate 50, the increased flue gas is shunted to be discharged from the gap between the exhaust gas collecting device 40 and the furnace body 20 and the air inlet channel, so that the temporary evacuation of the flue gas is realized, and further, the occurrence of explosion accidents is avoided. Of course, in order to ensure the efficiency of temporary evacuation of the flue gas of the explosion-proof straight-channel resistance furnace 10 in which the exhaust gas is collected, a pressure-openable sealing curtain 60 is also provided between the exhaust gas collection device 40 and both ends of the furnace shaft 20.

In this embodiment, the furnace body 20 includes a permeable movable side wall 21 and a furnace core 22, the region enclosed by the movable side wall 21 and the furnace end 30 is used for accommodating the furnace core and raw materials, the movable side wall 21 includes a channel steel frame 210 and a permeable wall 211 embedded in the channel steel frame 210, the exhaust gas guide plate 50 is relatively fixed to the movable side wall 21, a gap is formed between the exhaust gas guide plate 50 and the movable side wall 21, and the height of the exhaust gas guide plate 50 is smaller than the height of the movable side wall 21. The waste gas collecting device 40 comprises a cover 41, a gas collecting pipe 42 and a fan 43, wherein the cover 41 covers the ventilation wall 211, a first insulating cushion 70 is arranged on the contact part of the cover 41 and the ventilation wall 211, and a gap is arranged between the cover 41 and the ventilation wall 211, so that the first insulating cushion 70 prevents the electric connection between the furnace body 20 and the waste gas collecting device 40, and further prevents the occurrence of a furnace-spraying explosion accident caused by the electric connection, the gas collecting pipe 42 is fixed in the cover 41, a flue gas inlet hole 420 is formed in the pipe wall of the gas collecting pipe 42 positioned in the cover 41, one end of the gas collecting pipe 42 extending out of the cover 41 is connected with the fan 43, and the fan 43 generates negative pressure in the gas collecting pipe 42, so that flue gas diffused above the furnace body and flue gas and air guided by the waste gas guide plate 50 enter the gas collecting pipe 42 through the flue gas inlet hole 420 and are conveyed to an external flue gas processing device by the fan 43 for processing.

Further, exhaust gas collecting device 40 still includes spraying cooling pipe way 44, and spraying cooling pipe way 44 is fixed in covering cover 41, and spraying cooling pipe way 44 is parallel with gas collecting pipe 42, and spraying cooling pipe way 44 is located the below of gas collecting pipe 42, so after the carborundum smelting, can reach rapid cooling's purpose through spraying cooling pipe way 44 water, and produced flue gas, the steam of cooling in-process are collected by exhaust gas collecting device 40 and are carried to external flue gas processing apparatus.

Of course, in consideration of the convenience and safety of assembly in the actual production process, the movable side walls 21 and the covering hood 41 may be modularized, that is, the plurality of movable side walls 21 are assembled into the furnace shell 20, and the plurality of covering hoods 41 are assembled into an integral covering hood. For example, the exhaust gas collecting device 40 includes at least two cover hoods 41, and a gas collecting pipe 42 and a spray cooling pipe 44 are fixedly disposed in each cover hood 41. The covering cover 41 comprises a first transverse plate 410, a second transverse plate 411, a third transverse plate 412 and two side plates 413 extending downwards from two sides of the first transverse plate 410, the second transverse plate 411 and the third transverse plate 412 are fixedly connected with one side plate 413 correspondingly, the first transverse plate 410, the second transverse plate 411 and the third transverse plate 412 are parallel to each other, the first transverse plate 410 is positioned above the second transverse plate 411 and the third transverse plate 412, the second transverse plate 411 and the third transverse plate 412 are positioned in the same plane, the distance between the second transverse plate 411 and the third transverse plate 412 is larger than the width of the first transverse plate 410, supporting parts 414 are arranged on the lower surfaces of the second transverse plate 411 and the third transverse plate 412, and the first insulating layer 70 is arranged on the supporting parts 414; vertical reinforcing ribs 415 are arranged between the side plates 413 and the second transverse plate 411 and the third transverse plate 412, transverse reinforcing ribs 416 are arranged between the two side plates 413, the gas collecting pipe 42 is fixedly connected with the transverse reinforcing ribs 416 to realize the relative fixation of the gas collecting pipe 42 and the covering hood 41, and the spraying cooling pipeline 44 is fixedly connected with the transverse reinforcing ribs 416 to realize the relative fixation of the spraying cooling pipeline 44 and the covering hood 41; a pressure opening type sealing curtain 60 is arranged between the adjacent covering hoods 41, one end of each gas collecting pipe 42 is provided with a telescopic sleeve-joint piece 45, a second insulating layer 46 is arranged inside the telescopic sleeve-joint piece 45, the gas collecting pipes 42 in the adjacent covering hoods 41 are mutually communicated through the telescopic sleeve-joint pieces 45, each gas collecting pipe 42 is communicated to form an integral gas collecting pipe, one end of each integral gas collecting pipe is sealed, and the other end of each integral gas collecting pipe is connected with a fan 43. Wherein, the second horizontal plate 411 and the third horizontal plate 412 are provided with the safety explosion-proof window 80. The first and second

insulating layers

70, 46 may be made of high temperature resistant asbestos material. One end of the first transverse plate 410 in the cover 41 is provided with a sealing curtain fixing plate 47, one end of the pressure-openable sealing curtain 60 is fixedly connected with the sealing curtain fixing plate 47, and the other end of the pressure-openable sealing curtain 60 is overlapped at one end of the first transverse plate 410 of the adjacent cover 41. The size of the pressure-openable sealing curtain 60 is determined according to the size required for its position.

Further, the exhaust gas guide plate 50 includes a smoke blocking plate 51 and a guiding flow dividing plate 52, the height of the smoke blocking plate 51 is smaller than that of the ventilation wall 211, a first end of the guiding flow dividing plate 52 is fixedly connected with the smoke blocking plate 51, a second end of the guiding flow dividing plate 52 is close to the covering cover 41, a pressure-opening sealing curtain 60 is arranged on the second transverse plate 411 and the third transverse plate 412, and a free end of the pressure-opening sealing curtain 60 is correspondingly close to the smoke blocking plate 52 to prevent outside air from entering from a gap between the covering cover 41 and the ventilation wall, so that smoke and air entering from the bottom of the exhaust gas guide plate 50 can better flow to the exhaust gas collecting device 40; further, the distance from the second end of the guiding dividing plate 52 to the furnace body 20 is smaller than the distance from the first end of the guiding dividing plate 52 to the furnace body 20, so that the enlarged flue gas (mainly comprising carbon dioxide and dust) in the flue gas collecting device 40 is mostly discharged from the gap between the flue gas collecting device 40 and the furnace body 20 under the guiding of the guiding dividing plate 52, the enlarged flue gas in the flue gas collecting device 40 is partially guided between the flue gas blocking plate 51 and the furnace body 20, the flue gas (mainly comprising dust and carbon monoxide) between the flue gas blocking plate 51 and the furnace body 20 is temporarily closed by the introduced enlarged flue gas and the air from the outside, and the flue gas is guided by the flue gas collecting device 40 to be conveyed to the outside flue gas treatment device for treatment when the pressure in the region enclosed by the flue gas collecting device 40 and the flue gas guiding plate 50 is restored to the normal production standard. The smoke barrier plate 51 is provided with a safety explosion-proof window 80, and the smoke barrier plate 51 inclines for 2-15 degrees towards the direction of the ventilating wall 211, so that the safety explosion-proof window 80 can be closed under the action of the self weight, and further explosion accidents are avoided.

Claims

1. The utility model provides a collect waste gas and straight flute type resistance furnace that can blast proof which characterized in that: the waste gas collecting device is arranged above the furnace body, the waste gas guide plates are arranged on two sides of the furnace body, a gap exists between the waste gas guide plates and the furnace body, an air inlet channel for allowing outside air to enter is arranged between the waste gas guide plates and the ground, the waste gas guide plates are used for blocking the diffusion of smoke generated in the furnace body to two sides of the furnace body and guiding the smoke and the air entering from the bottoms of the waste gas guide plates to flow to the waste gas collecting device, the waste gas collecting device is used for collecting and oxidizing the smoke and the air which are diffused to the upper part of the furnace body and are guided by the waste gas guide plates and then conveying the smoke and the air to the outside smoke treatment device for treatment, a gap is formed between the waste gas collecting device and the furnace body, and when the air pressure in an area defined by the waste gas collecting device and the waste gas guide plates is suddenly increased, the collected smoke is released by the gap to reduce the air pressure; the furnace body comprises a breathable movable side wall and a furnace core, the region enclosed by the movable side wall and the furnace end is used for containing the furnace core and raw materials, the movable side wall comprises a channel steel frame and a breathable wall embedded in the channel steel frame, a waste gas guide plate and the movable side wall are relatively fixed, and a gap is formed between the waste gas guide plate and the movable side wall; the waste gas collecting device comprises a covering hood, a gas collecting pipe and a fan, the covering hood covers the breathable wall, a first insulating cushion layer is arranged on the portion, in contact with the breathable wall, of the covering hood, a gap is formed between the covering hood and the breathable wall, and the gas collecting pipe is fixed in the covering hood.

2. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 1, wherein: set up pressure open-type sealed curtain between exhaust gas collection device and the exhaust gas guide plate, pressure open-type sealed curtain is used for hindering external air to get into from the clearance between exhaust gas collection device and the shaft of a furnace, and pressure open-type sealed curtain still is used for opening when the regional internal pressure of waste gas collection device and exhaust gas guide plate wall city is greater than its self pressure-bearing value to release the flue gas that converges.

3. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 2, wherein: a pressure-opening sealing curtain is also arranged between the waste gas collecting device and the two ends of the furnace body.

4. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 2, wherein: the pipe wall of the gas collecting pipe positioned in the covering cover is provided with a flue gas inlet hole, one end of the gas collecting pipe extending out of the covering cover is connected with a fan, and the fan enables negative pressure to be generated in the gas collecting pipe, so that flue gas diffused above the furnace body and flue gas and air guided by the waste gas guide plate enter the gas collecting pipe through the flue gas inlet hole and are conveyed to an external flue gas treatment device by the fan for treatment.

5. The exhaust gas-collecting explosion-proof straight slot type electric resistance furnace according to claim 4, wherein: the waste gas collecting device further comprises a spraying cooling pipeline, the spraying cooling pipeline is fixed in the covering cover and parallel to the gas collecting pipe, and the spraying cooling pipeline is located below the gas collecting pipe.

6. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 4, wherein: the waste gas collecting device comprises at least two cover covers, a gas collecting pipe and a spraying cooling pipeline are fixedly arranged in each cover, each cover comprises a first transverse plate, a second transverse plate, a third transverse plate and two side plates extending downwards from two sides of the first transverse plate, the second transverse plate and the third transverse plate are correspondingly and fixedly connected with one side plate, the first transverse plate, the second transverse plate and the third transverse plate are parallel to each other, the first transverse plate is positioned above the second transverse plate and the third transverse plate, the second transverse plate and the third transverse plate are positioned in the same plane, the distance between the second transverse plate and the third transverse plate is larger than the width of the first transverse plate, supporting parts are arranged on the lower surfaces of the second transverse plate and the third transverse plate, and first insulating cushion layers are arranged on the supporting parts; vertical reinforcing ribs are arranged between the side plates and the second transverse plate and between the side plates and the third transverse plate, transverse reinforcing ribs are arranged between the two side plates, the gas collecting pipe is fixedly connected with the transverse reinforcing ribs to realize the relative fixation of the gas collecting pipe and the covering cover, and the spray cooling pipeline is fixedly connected with the transverse reinforcing ribs to realize the relative fixation of the spray cooling pipeline and the covering cover; a pressure opening type sealing curtain is arranged between adjacent covering hoods, one end of each gas collecting pipe is provided with a telescopic sleeve-joint piece, a second insulating layer is arranged inside the telescopic sleeve-joint piece, the gas collecting pipes in the adjacent covering hoods are mutually communicated through the telescopic sleeve-joint pieces, each gas collecting pipe is communicated to form an integral gas collecting pipe, one end of each integral gas collecting pipe is sealed, and the other end of each integral gas collecting pipe is connected with a fan.

7. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 6, wherein: and the second transverse plate and the third transverse plate are provided with safety explosion-proof windows.

8. The exhaust gas-collecting explosion-proof straight slot type electric resistance furnace according to claim 1 or 2, wherein: waste gas guide plate includes the flue gas barrier plate, the guide flow distribution plate, the height that highly is less than the ventilative wall of flue gas barrier plate, the first end and the flue gas barrier plate fixed connection of guide flow distribution plate, and the second end of guide flow distribution plate is close to waste gas collection device, the distance that the second end of guide flow distribution plate reaches the furnace shaft is less than the distance that the first end of guide flow distribution plate reaches the furnace shaft, under the guide of guide flow distribution plate, the flue gas majority that will be located the increase in waste gas collection device is discharged from the clearance between waste gas collection device and the furnace shaft, the flue gas that will be located the increase in waste gas collection device is at least partly guided to between flue gas barrier plate and the furnace shaft, utilize the flue gas of the increase of entering and the air that gets into from the external world to be located the temporary closure of flue gas between flue gas barrier plate and the furnace shaft.

9. The exhaust gas-collecting explosion-proof straight slot type electric resistance furnace according to claim 8, wherein: the smoke barrier plate is provided with a safety explosion-proof window, and the smoke barrier plate inclines for 2-15 degrees towards the direction of the ventilating wall, so that the safety explosion-proof window can be closed under the action of the weight of the safety explosion-proof window.

10. The exhaust gas-collecting explosion-proof straight-tank type electric resistance furnace according to claim 1, wherein: the height of the waste gas guide plate is smaller than that of the movable side wall.