CN117588939A - Electric side heating tunnel kiln - Google Patents

Electric side heating tunnel kiln Download PDF

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Publication number
CN117588939A
CN117588939A CN202311549813.1A CN202311549813A CN117588939A CN 117588939 A CN117588939 A CN 117588939A CN 202311549813 A CN202311549813 A CN 202311549813A CN 117588939 A CN117588939 A CN 117588939A
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CN
China
Prior art keywords
air
furnace chamber
air inlet
air flow
partition board
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311549813.1A
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Chinese (zh)
Inventor
何悦天
徐振敏
吴桢
周国权
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Xinnuo Advanced Thermal Technology Suzhou Co ltd
Original Assignee
Xinnuo Advanced Thermal Technology Suzhou Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Xinnuo Advanced Thermal Technology Suzhou Co ltd filed Critical Xinnuo Advanced Thermal Technology Suzhou Co ltd
Priority to CN202311549813.1A priority Critical patent/CN117588939A/en
Publication of CN117588939A publication Critical patent/CN117588939A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/062—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated electrically heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/06—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated
    • F27B9/10—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity heated without contact between combustion gases and charge; electrically heated heated by hot air or gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/3005—Details, accessories, or equipment peculiar to furnaces of these types arrangements for circulating gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
    • F27B9/36—Arrangements of heating devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Furnace Details (AREA)

Abstract

The invention relates to an electric side heat tunnel kiln, comprising: kiln body, baffle, circulating fan and heater; the partition board is arranged in the kiln body, a furnace chamber is formed in the partition board, a sandwich structure is formed between the partition board and the kiln body, a first air inlet is formed in the bottom of the side face of the partition board, and a second air inlet and an air outlet are formed in the top face of the partition board; the circulating fan drives gas to enter the furnace chamber from a first air inlet at the bottom of the partition plate, then the gas is extracted from the top of the furnace chamber, a first air flow from bottom to top is formed in the furnace chamber, meanwhile, the circulating fan drives gas to enter the furnace chamber from a second air inlet at the top of the partition plate, a second air flow from top to bottom is formed in the furnace chamber, and the second air flow causes disturbance to the first air flow in the furnace chamber. According to the invention, the turbulent airflow opposite to the flowing direction of the main airflow is sprayed into the furnace chamber to disturb the laminar flow in the furnace chamber, so that turbulent flow is formed in the furnace chamber, thereby improving the temperature uniformity in the effective heating space and being beneficial to improving the quality and consistency of calcined products.

Description

Electric side heating tunnel kiln
Technical Field
The invention relates to the technical field of tunnel kilns, in particular to an electric side heat tunnel kiln.
Background
The kiln car type tunnel kiln (tunnel kiln for short) is a thermal equipment for continuous production, which is widely applied to the fields of ceramic, refractory materials, or metal product heat treatment and the like. The kiln car type tunnel kiln has a tunnel inside, and a continuous track is laid at the bottom of the tunnel and extends out of the kiln body from both ends of the tunnel. The heating device is arranged in the furnace body, so that different areas in the tunnel along the length direction can be heated to different temperatures. The tunnel kiln is used for carrying materials, and the tool is a kiln car (also called a trolley), wheels are arranged at the bottom of the kiln car, and the kiln car rolls on a track at the bottom of a tunnel of the kiln body by means of the wheels. Refractory material (kiln car lining) is paved on the bottom frame (frame) of the wheel kiln car, and the kiln car lining forms a closed high-temperature space with the kiln wall and the kiln top of the tunnel kiln made of the refractory material for high-temperature calcination of products. And placing products or materials to be heat treated on the kiln car lining material, so that the kiln car enters the tunnel from one end (kiln head) of the furnace body tunnel. After the kiln car enters the kiln, the kiln car advances in a jacking mode, namely, the kiln car entering later is propped against the kiln car in front, and a power mechanism is arranged at the inlet of the kiln to push the kiln car entering last to advance forwards. The kiln cars are mutually jacked, and the kiln cars are preheated, sintered, cooled and the like, and then leave the tunnel kiln from the other end (kiln tail) of the tunnel to finish heat treatment.
The traditional tunnel kiln is basically characterized in that fuel (such as natural gas) is sprayed into a furnace chamber for combustion, high-temperature and high-speed smoke is generated for heating materials, and a good temperature field is formed. In the field of calcining atmosphere sensitive materials (such as cathode materials), heating cannot be performed in this way, but only by an electric heater.
In recent years, technicians have tried to modify a conventional kiln car type tunnel kiln and then apply the kiln car type tunnel kiln to high-temperature calcination of anode and cathode materials of lithium ion or sodium ion batteries, for example: publication No.: EP3978854A1, invention name: tunnel furnace for the heat treatment of products, method for operating such a tunnel furnace and European patent application for the use of such a tunnel furnace. In this patent, the inventors designed the cavity of the tunnel kiln as a sandwich structure: an inner furnace chamber is formed of a refractory material as a space for heat-treating a heating object, and a sandwich space is constructed between the inner furnace chamber and the furnace roof and the furnace walls on both sides of the furnace as an air flow passage. An electric heater is arranged in the interlayer space at the two sides of the kiln and is used for heating air flow. A circulating fan is arranged at the top of the inner furnace chamber. The circulating fan sucks air or process gas in the furnace chamber into the interlayer at the top of the kiln, and then the air flow enters the interlayer of the furnace walls at the two sides from the interlayer at the top under the action of the circulating fan and is heated by a heater arranged in the air flow. Small holes are arranged on the furnace chamber between the inner furnace chamber and the interlayer space of the furnace wall, and small air flows enter the inner furnace chamber from the side face through the small holes from the interlayer space. But most of the heated gas enters the cavity through the opening at the bottom of the interlayer and then flows from bottom to top in the cavity while transferring heat to the heating object placed in the cavity. The air flow is sucked into the interlayer of the furnace top by the circulating fan at the furnace top, and the air flow circulates in a reciprocating manner. In this way, the gas in the oven cavity and the gas in the interlayer are circulated, and the heat of the heater in the interlayer is transferred to the heating object (convection heating) in the oven cavity through the gas. However, the technique disclosed in this patent has several important problems:
firstly, in the fluid mechanics, according to the Reynolds number, when the Reynolds number is smaller, the influence of viscous force on a flow field is larger than the inertia force, the disturbance of the flow velocity in the flow field is attenuated by the viscous force, and the fluid flow is stable and laminar; on the contrary, if the Reynolds number is larger, the influence of the inertia force on the flow field is larger than the viscous force, the fluid flow is unstable, the tiny change of the flow speed is easy to develop and strengthen, and a turbulent flow field with disorder and irregularity is formed. For the convection heat transfer mode, the laminar flow can cause serious difference of temperature difference, namely heat is continuously increased in the laminar flow, so that temperature difference of the upper space and the lower space is caused, and compared with the turbulent flow, smaller temperature difference is formed. The airflow in the furnace flows only in one direction, namely from bottom to top, and forms a laminar flow phenomenon, and if the direction and the flow rate of the airflow entering from the side are not researched and carefully designed, good temperature uniformity cannot be formed in the furnace chamber.
Second, in this invention, it is necessary to exhaust a portion of the exhaust-containing gas during the circulation of the gas stream in the oven cavity and the interlayer, while supplementing the gas stream with some fresh air or process gas. While the air inlet of the invention is provided at a position (in the direction of the air flow) downstream of the heater in the furnace wall interlayer. This can cause cold air or cold process gases to directly enter the inner furnace chamber, which is detrimental to maintaining a stable temperature field within the furnace chamber.
Third, certain materials may volatilize corrosive materials into the circulating gas stream during high temperature calcination. For example, when calcining lithium or sodium cathode materials at high temperatures, lithium-containing, strongly basic species volatilize from the material into the gas stream at high temperatures. While the blades and the rotating shaft (usually made of metal) of the circulating fan are in continuous contact with high-temperature air flow containing corrosive substances during operation, the blades and the rotating shaft can be corroded rapidly, and the service life is shortened rapidly. And the price of the high-temperature circulating fan is very high, and the frequent replacement of the circulating fan or the blades and the rotating shaft can cause the overhigh production cost. In addition, metal debris from corrosion is carried by the gas stream into the high temperature calcined material, which is unacceptable for some calcined products such as lithium or sodium positive and negative electrode materials, as this can lead to serious safety problems for lithium or sodium batteries.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the practical problem of the tunnel kiln in the prior art, and provide a more practical electric side heat tunnel kiln, wherein turbulent air flow opposite to the flowing direction of main air flow is sprayed into the furnace chamber to disturb laminar flow in the furnace chamber, so that turbulent flow is formed in the furnace chamber, thereby improving the temperature uniformity in an effective heating space and being beneficial to improving the quality and consistency of calcined products.
In order to solve the technical problems, the invention provides an electric side heat tunnel kiln, which comprises:
a kiln body;
the partition board is arranged in the kiln body, a furnace chamber is formed in the partition board, a sandwich structure is formed between the partition board and the kiln body, the sandwich structure comprises a first sandwich layer arranged between the side face of the partition board and the kiln body, and a second sandwich layer arranged between the top face of the partition board and the kiln body, a first air inlet hole is formed in the bottom of the side face of the partition board, the first air inlet hole is communicated with the first sandwich layer, a second air inlet hole is formed in the top face of the partition board, the second air inlet hole is communicated with the second sandwich layer, and an air outlet hole is formed in the top face of the partition board;
the circulating fan is arranged at the top of the kiln body, an extraction opening of the circulating fan is communicated with the air outlet, an air outlet of the circulating fan is communicated with the second interlayer, and the circulating fan pumps the gas in the furnace chamber into the second interlayer and drives the gas to flow to the first interlayer;
a heater provided in the first interlayer and configured to heat the flowing gas;
the circulating fan drives gas to enter the furnace chamber from the first air inlet hole at the bottom of the partition plate, then the gas is extracted from the top of the furnace chamber, first air flow from bottom to top is formed in the furnace chamber, meanwhile, the circulating fan drives gas to enter the furnace chamber from the second air inlet hole at the top surface of the partition plate, second air flow from top to bottom is formed in the furnace chamber, and the second air flow causes disturbance to the first air flow in the furnace chamber.
In one embodiment of the invention, the kiln car is arranged in the furnace chamber, a plurality of rows of material stacks are placed on the kiln car, a first air flow channel is arranged between the material stacks and the kiln car and is opposite to the first air inlet hole, a second air flow channel is reserved between each material stack and the partition plate and between two adjacent rows of material stacks, one end of the second air flow channel is communicated with the first air flow channel, and the other end of the second air flow channel is opposite to the second air inlet hole.
In one embodiment of the invention, the two side surfaces of the partition plate are provided with the first air inlets, and the first air inlets on the two side surfaces are distributed in a staggered way.
In one embodiment of the invention, the aperture of the second air inlet hole is controlled according to the pressure of the circulating fan and the pressure in the furnace chamber, so that the flow rate of the second air flow is more than 10m/s.
In one embodiment of the invention, a third air inlet hole is formed in the middle of the side surface of the partition board, the third air inlet hole is communicated with the first interlayer, the circulating fan drives air to enter the partition board from the third air inlet hole on the side surface of the partition board, a third air flow is formed in the partition board, and the third air flow and the second air flow jointly cause disturbance to the first air flow in the partition board.
In one embodiment of the present invention, the third air inlet hole is disposed obliquely downward with respect to the horizontal plane, and the third air flow flows from top to bottom.
In one embodiment of the invention, the aperture of the third air inlet hole is controlled according to the pressure of the circulating fan and the pressure in the furnace chamber, so that the flow rate of the third air flow is more than 10m/s.
In one embodiment of the invention, the two side surfaces of the partition plate are provided with the third air inlets, and the third air inlets positioned on the two side surfaces are distributed in a staggered way.
In one embodiment of the invention, a supplementary air inlet and an air outlet are also arranged at the top of the kiln body, the supplementary air inlet is communicated with the air supply system of the kiln body, and the supplementary air inlet is correspondingly arranged at the positions of the rotating shaft and the blades of the circulating fan.
In one embodiment of the invention, the top surface of the partition plate is an arch structure protruding towards the top of the kiln body, and an airflow converging space is reserved at the top of the kiln chamber.
Compared with the prior art, the technical scheme of the invention has the following advantages:
compared with the fuel tunnel kiln in the prior art, the electric side heat tunnel kiln provided by the invention provides a technical scheme suitable for calcining atmosphere sensitive materials, and adopts an electric heating mode of a heater to provide a heat source; compared with the electric side heat tunnel kiln in the prior art, the turbulent airflow which is opposite to the flowing direction of the main airflow is sprayed into the furnace chamber to disturb the laminar flow in the furnace chamber, so that turbulent flow is formed in the furnace chamber, the temperature uniformity in the effective heating space is improved, and the quality and consistency of calcined products are improved.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a schematic view of a front cross-sectional structure of an electric side heat tunnel kiln of the present invention;
FIG. 2 is a schematic view of the cross-sectional structure of the furnace inner side surface of the electric side heat tunnel kiln of the present invention;
FIG. 3 is a schematic diagram showing a side sectional structure of a furnace body of the electric side heat tunnel kiln of the present invention.
Description of the specification reference numerals: 1. a kiln body; 101. a supplemental air inlet; 102. an exhaust port; 2. a partition plate; 201. a first air inlet hole; 202. a second air inlet hole; 203. an air outlet hole; 204. a third air inlet hole; 3. a cavity; 401. a first interlayer; 402. a second interlayer; 5. a circulating fan; 501. a rotating shaft; 502. a blade; 6. a heater; 7. a first air stream; 8. a second gas stream; 9. kiln car; 10. stacking materials; 11. a column; 12. a first airflow passage; 13. a second airflow passage; 14. and a third air flow.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1, the present invention provides an electric side heat tunnel kiln including: the kiln comprises a kiln body 1 and a partition plate 2 arranged in the kiln body 1, wherein the kiln body 1 and the partition plate 2 are made of refractory materials, an inner cavity of the kiln body 1 is divided into a double-layer structure through the partition plate 2, a furnace cavity 3 is formed in the partition plate 2, a sandwich structure is formed between the partition plate 2 and the kiln body 1, the sandwich structure comprises a first sandwich layer 401 arranged between the side surface of the partition plate 2 and the kiln body 1 and a second sandwich layer 402 arranged between the top surface of the partition plate 2 and the kiln body 1, a first air inlet hole 201 is formed in the bottom of the side surface of the partition plate 2, the first air inlet hole 201 is communicated with the first sandwich layer 401, a second air inlet hole 202 is formed in the top surface of the partition plate 2, and an air outlet hole 203 is formed in the top surface of the partition plate 2;
the electric side heat tunnel kiln of the present embodiment further includes: a circulating fan 5 and a heater 6, wherein the circulating fan 5 is arranged at the top of the kiln body 1, the circulating fan 5 is provided with an extraction opening and an exhaust opening, the extraction opening of the circulating fan 5 is communicated with the air outlet 203, the exhaust opening of the circulating fan 5 is communicated with the second interlayer 402, and thus, the circulating fan 5 pumps the gas in the furnace chamber 3 into the second interlayer 402 and drives the gas to flow to the first interlayer 401; the heater 6 is arranged in the first interlayer 401, and the heater 6 is an electric heater 6; the circulating fan 5 drives the gas to pass through the first interlayer 401, and in the first interlayer 401, the heater 6 can perform heating treatment on the gas blown by the circulating fan 5. After the gas is heated, the gas enters the furnace chamber 3 from the first air inlet hole 201 at the bottom of the partition plate 2, the circulating fan 5 extracts the gas from the top of the furnace chamber 3, and a first gas flow 7 from bottom to top is formed in the furnace chamber 3; meanwhile, the circulating fan 5 drives air to enter the furnace chamber 3 from the second air inlet 202 on the top surface of the partition board 2, a second air flow 8 from top to bottom is formed in the furnace chamber 3, and the second air flow 8 causes disturbance to the first air flow 7 in the furnace chamber 3.
According to the Reynolds number in the fluid mechanics, when the Reynolds number is smaller, the influence of viscous force on the flow field is larger than the inertia force, the disturbance of the flow velocity in the flow field is attenuated by the viscous force, and the fluid flow is stable and laminar; on the contrary, if the reynolds number is larger, the influence of the inertia force on the flow field is larger than the viscous force, the fluid flow is unstable, the tiny change of the flow speed is easy to develop and strengthen, a turbulent flow field with turbulence and irregularity is formed, for the mode of convection heat transfer, the laminar flow can cause serious difference of temperature difference, namely the heat continuously rises in the laminar flow, the temperature difference of the upper space and the lower space is caused, and compared with the turbulent flow, the smaller temperature difference is formed. The turbulent airflow opposite to the flowing direction of the main airflow is sprayed into the furnace chamber 3 by utilizing the principle, which is equivalent to increasing the Reynolds number of the fluid, and the laminar flow in the furnace chamber 3 is disturbed, so that turbulent flow is formed in the furnace chamber 3, the temperature uniformity in the effective heating space is improved, and the quality and consistency of calcined products are improved.
Specifically, in order to realize the transportation of the materials in the furnace chamber 3, a track is arranged in the furnace chamber 3, a kiln car 9 is further arranged on the track, and a plurality of rows of material stacks 10 are arranged on the kiln car 9. In order to achieve a flow of the first and second air streams 7, 8 between the stacks 10, in this embodiment, a plurality of rows of columns 11 supporting the stacks 10 are provided on the kiln car 9, the stacks 10 being lifted from the kiln car 9 by the columns 11, so that a first air flow channel 12 is formed between the stacks 10 and the kiln car 9. The first air flow channel 12 is arranged opposite to the first air inlet hole 201, and the first air flow 7 can directly enter the first air flow channel 12 from the first air inlet hole 201. The rows of upright posts 11 are arranged at intervals, so that second air flow passages 13 are reserved between the material stacks 10 and the partition plates 2 and between two adjacent rows of material stacks 10. One end of the second air flow channel 13 is communicated with the first air flow channel 12, the other end of the second air flow channel 13 is opposite to the second air inlet 202, and the second air flow 8 can be directly injected into the second air flow channel 13 after passing through the second air inlet 202. The flow rate of the second air flow 8 is maintained as much as possible, and meets the first air flow 7 in the second air flow channel 13, resulting in a severe disturbance of the first air flow 7.
In this embodiment, referring to fig. 2, a plurality of first air inlets 201 are disposed on both sides of the partition board 2, and the plurality of first air inlets 201 on both sides are staggered (respectively, solid line and dotted line in fig. 2), so that the first air flow 7 entering the oven cavity 3 at high speed is staggered, forming a circulating air flow, and the air flow temperature distribution is more uniform.
In this embodiment, in order to increase the reynolds number in the flow field as much as possible, so that the main air flow can be disturbed severely, the diameter of the second air inlet 202 is smaller than that of the first air inlet 201, and the aperture of the second air inlet 202 is controlled according to the pressure of the circulating fan 5 and the pressure in the oven cavity 3, so that the flow rate of the second air flow 8 is greater than 10m/s. The flow rate of the second air flow 8 is increased as much as possible, and a severe air flow disturbance is formed, so that better temperature uniformity can be formed.
Example 2
Referring to fig. 1, in order to increase the disturbance effect on the first air flow 7 as much as possible on the basis of embodiment 1, a third air intake hole 204 is provided in the middle of the side surface of the partition plate 2. The third air inlet 204 is communicated with the first interlayer 401, and the circulating fan 5 drives air to enter the partition board 2 from the third air inlet 204 on the side surface of the partition board 2, so that a third air flow 14 is formed in the partition board 2. The third air flow 14 and the second air flow 8 together cause turbulence in the first air flow 7 within the partition 2.
Specifically, the third air inlet 204 is disposed obliquely downward with respect to the horizontal plane, so that the third air flow 14 flows from top to bottom, and has the same direction as the second air flow 8 from top to bottom in the oven cavity 3, and is opposite to the first air flow 7 from bottom to top in the oven cavity 3, so as to disturb the first air flow 7, and improve the temperature uniformity in the oven cavity 3.
Similarly, in order to increase the reynolds number in the flow field as much as possible, so that the main air flow can be disturbed severely, the diameter of the third air inlet 204 is smaller than that of the first air inlet 201, and the aperture of the third air inlet 204 is controlled according to the pressure of the circulating fan 5 and the pressure in the furnace chamber 3, so that the flow rate of the third air flow 14 is greater than 10m/s. The flow rate of the third air stream 14 is increased as much as possible to create a severe air flow disturbance to create better temperature uniformity.
Referring to fig. 3, a plurality of third air inlets 204 are disposed on both sides of the partition board 2, and the plurality of third air inlets 204 disposed on both sides are staggered (respectively hollow and solid points in fig. 3), so that the third air flow 14 entering the oven cavity 3 at high speed is spatially staggered, disturbance to the first air flow 7 from bottom to top in the oven cavity 3 is enhanced, and the air flow temperature distribution is more uniform.
Example 3
Referring to fig. 1, on the basis of embodiments 1 and 2, a supplementary air inlet 101 and an air outlet 102 are further provided at the top of the kiln body 1. The supplementary air inlet 101 is communicated with a gas supply system of the kiln body 1, cold fresh air or process gas is input into the tunnel kiln, and the supplementary air inlet 101 is arranged at the positions corresponding to the rotating shaft 501 and the blades 502 of the circulating fan 5. After cold air or process gas enters the furnace chamber 3 from the supplementary air inlet 101, the rotating shaft 501 and the blades 502 of the circulating fan 5 can be locally cooled to a certain extent, and meanwhile, the entering fresh gas also dilutes the concentration of corrosive substances in the air flow in a local space contacted with the circulating fan 5 and the rotating shaft 501, so that the two have great effects on relieving the corrosion of the circulating fan 5 and prolonging the service life.
In this embodiment, the cool supplementary gas first enters the second interlayer 402 and then enters the first interlayer 401, and is heated by the heater 6 provided in the first interlayer 401, before entering the cavity 3. Therefore, the influence of the air inlet on the stable temperature field in the furnace chamber 3 is eliminated, the air entering the furnace chamber 3 is ensured to be heated, and the temperature uniformity in the furnace chamber 3 is improved.
Specifically, in order to eliminate or greatly reduce the influence of the corrosive atmosphere on the circulating fan 5, the blade 502 may be made of a ceramic material (such as alumina or zirconia), or the surfaces of the blade 502 and the rotating shaft 501 may be coated with a ceramic film, such as a tungsten carbide ceramic film, so that the service life of the circulating fan 5 may be greatly prolonged.
In the above three embodiments, the top surface of the partition board 2 is provided with an arch structure protruding towards the top of the kiln body 1, and an air flow converging space is reserved at the top of the kiln chamber 3, so that the convergence of air flow at the top is more facilitated, the air flow dead zone formed at the joint of the top surface of the partition board 2 and the side surface of the partition board 2 is reduced, the temperature uniformity in the kiln chamber 3 is improved, and the influence of waste gas accumulation in the air flow dead zone on the quality of a product calcined at high temperature is avoided.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (10)

1. An electric side heat tunnel kiln comprising:
a kiln body;
the partition board is arranged in the kiln body, a furnace chamber is formed in the partition board, a sandwich structure is formed between the partition board and the kiln body, the sandwich structure comprises a first sandwich layer arranged between the side face of the partition board and the kiln body, and a second sandwich layer arranged between the top face of the partition board and the kiln body, a first air inlet hole is formed in the bottom of the side face of the partition board, the first air inlet hole is communicated with the first sandwich layer, a second air inlet hole is formed in the top face of the partition board, the second air inlet hole is communicated with the second sandwich layer, and an air outlet hole is formed in the top face of the partition board;
the circulating fan is arranged at the top of the kiln body, an extraction opening of the circulating fan is communicated with the air outlet, an air outlet of the circulating fan is communicated with the second interlayer, and the circulating fan pumps the gas in the furnace chamber into the second interlayer and drives the gas to flow to the first interlayer;
a heater provided in the first interlayer and configured to heat the flowing gas;
wherein: the circulating fan drives gas to enter the furnace chamber from the first air inlet hole at the bottom of the partition plate, then the gas is extracted from the top of the furnace chamber, a first air flow from bottom to top is formed in the furnace chamber, meanwhile, the circulating fan drives gas to enter the furnace chamber from the second air inlet hole at the top surface of the partition plate, a second air flow from top to bottom is formed in the furnace chamber, and the second air flow causes disturbance to the first air flow in the furnace chamber.
2. The electric side heat tunnel kiln according to claim 1, characterized in that: the kiln car is arranged in the furnace chamber, a plurality of rows of material stacks are placed on the kiln car, a first air flow channel is arranged between the material stacks and the kiln car and is opposite to the first air inlet holes, second air flow channels are reserved between the material stacks and the partition plate and between two adjacent rows of material stacks, one end of each second air flow channel is communicated with each first air flow channel, and the other end of each second air flow channel is opposite to the corresponding second air inlet hole.
3. The electric side heat tunnel kiln according to claim 1, characterized in that: the two sides of the partition board are provided with first air inlets which are distributed in a staggered way.
4. The electric side heat tunnel kiln according to claim 1, characterized in that: and controlling the aperture of the second air inlet hole according to the pressure of the circulating fan and the pressure in the furnace chamber, so that the flow speed of the second air flow is more than 10m/s.
5. The electric side heat tunnel kiln according to claim 1, characterized in that: the middle part of the side surface of the partition board is provided with a third air inlet, the third air inlet is communicated with the first interlayer, the circulating fan drives air to enter the partition board from the third air inlet of the side surface of the partition board, a third air flow is formed in the partition board, and the third air flow and the second air flow together disturb the first air flow in the partition board.
6. The electric side heat tunnel kiln according to claim 5, characterized in that: the third air inlet hole is arranged obliquely downwards relative to the horizontal plane, and the third air flow flows from top to bottom.
7. The electric side heat tunnel kiln according to claim 5, characterized in that: and controlling the aperture of the third air inlet hole according to the pressure of the circulating fan and the pressure in the furnace chamber, so that the flow speed of the third air flow is more than 10m/s.
8. The electric side heat tunnel kiln according to claim 5, characterized in that: third air inlets are formed in the two side faces of the partition plate, and the third air inlets located in the two side faces are distributed in a staggered mode.
9. The electric side heat tunnel kiln according to claim 1, characterized in that: the top of the kiln body is also provided with a supplementary air inlet and an air outlet, the supplementary air inlet is communicated with the air supply system of the kiln body, and the supplementary air inlet is correspondingly arranged at the positions of the rotating shaft and the blades of the circulating fan.
10. The electric side heat tunnel kiln according to claim 1, characterized in that: the top surface of the partition plate is an arch structure protruding towards the top of the kiln body, and an airflow converging space is reserved at the top of the kiln chamber.
CN202311549813.1A 2023-11-20 2023-11-20 Electric side heating tunnel kiln Pending CN117588939A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311549813.1A CN117588939A (en) 2023-11-20 2023-11-20 Electric side heating tunnel kiln

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311549813.1A CN117588939A (en) 2023-11-20 2023-11-20 Electric side heating tunnel kiln

Publications (1)

Publication Number Publication Date
CN117588939A true CN117588939A (en) 2024-02-23

Family

ID=89912690

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311549813.1A Pending CN117588939A (en) 2023-11-20 2023-11-20 Electric side heating tunnel kiln

Country Status (1)

Country Link
CN (1) CN117588939A (en)

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