CN108955239B - Hearth for rotary electric heating kiln and rotary kiln body manufactured by hearth - Google Patents
Hearth for rotary electric heating kiln and rotary kiln body manufactured by hearth Download PDFInfo
- Publication number
- CN108955239B CN108955239B CN201810876616.3A CN201810876616A CN108955239B CN 108955239 B CN108955239 B CN 108955239B CN 201810876616 A CN201810876616 A CN 201810876616A CN 108955239 B CN108955239 B CN 108955239B
- Authority
- CN
- China
- Prior art keywords
- hearth
- wall
- rotary
- kiln
- pipe bodies
- 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.)
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Links
- 238000005485 electric heating Methods 0.000 title claims description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 22
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 239000000919 ceramic Substances 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 239000011449 brick Substances 0.000 claims description 19
- 238000003825 pressing Methods 0.000 claims description 16
- 239000011810 insulating material Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000005350 fused silica glass Substances 0.000 claims description 2
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 2
- 230000008602 contraction Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000009768 microwave sintering Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/22—Rotary drums; Supports therefor
-
- 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/34—Arrangements of heating devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model provides a rotary kiln is with furnace and rotary kiln body of preparation thereof, includes the metal drum of belt drive device, sets up in the heat preservation material layer of metal drum inner wall, sets up in the inside firebrick layer of heat preservation material layer and the inboard furnace of firebrick layer. The hearth comprises at least one section of hearth wall, the hearth wall is formed by a plurality of pipe bodies which are closely distributed around the circle center, and heating elements are arranged in the pipe bodies. The hearth formed by the ceramic tubes with one or more layers can solve the problem of small change of the gap of the hearth material with the inner layer in the heat expansion and cold contraction more easily through the additional prestress of the outer layer.
Description
Technical Field
The invention relates to an externally heated rotary resistance kiln, which is particularly suitable for lithium ion battery materials: lithium cobalt oxide, lithium manganate and heat treatment of a positive electrode material such as lithium iron phosphate and a negative electrode carbon material.
Background
The kiln is divided into an electric kiln using electric energy and a non-electric kiln using solid, liquid, gas fuel or solar energy according to a heat source mode. The electric heating kiln is also divided into a resistance furnace, an electromagnetic induction furnace, an electric arc furnace, a heating imaging furnace, an electron beam furnace, a plasma furnace, an infrared heating furnace, a microwave sintering furnace and the like according to the mechanism of generating heat energy.
The electric heating kiln is divided into a rotary kiln with a rotary kiln hearth and a non-rotary kiln according to whether the kiln hearth is fixed or not, wherein the rotary kiln hearth is usually cylindrical.
The rotary resistance kiln is a rotary resistance kiln with a rotary cylinder body, and is divided into an externally heated rotary kiln and a rotary kiln heated from the inside of a hearth according to a heating mode. The hearth of the rotary kiln can be a metal cylinder; the hearth can also be built by refractory materials, and the outer layer of the hearth is usually a metal cylinder provided with a rotary transmission device.
An externally heated rotary kiln, generally, two types are classified: one is that the heating element is separated from the rotary kiln cylinder and does not directly contact it. The fixed heating part is installed in a furnace shell with a heat-insulating layer, the rotating cylinder rotates in the furnace shell, the heating element radiates heat to the cylinder from the outside, and the heated cylinder transfers the heat to materials in the cylinder. The other is that the heating element is directly arranged outside the cylinder body and rotates together with the cylinder body, the heating element is closer to the cylinder body, and simultaneously, the cylinder is subjected to radiation and conduction heating, and the heated cylinder transfers heat to materials in the cylinder. The second structure is complex, but the heating effect is better.
In the heating treatment process of the lithium ion battery material, the material needs to be prevented from being polluted by common materials, and the material contact parts are all 99 ceramic materials. So that rotary resistance kilns with external direct heating are now commonly used.
Externally heated, which is now frequently employed the cross section of the rotary resistor kiln is shown in figure 1:
the traditional rotary kiln body is composed of a metal cylinder 1 with a transmission device, an internal heat-insulating material layer 2, a fixed hearth refractory brick layer 3, a ceramic tube 4, a heating element 5, high-purity ceramic bricks 6, a bin plate 7 and the like.
The inside of the kiln hearth adopts high-purity ceramic bricks with the alumina content of more than 99 percent, a heating element 5 is arranged outside a high-purity ceramic brick layer, an insulating layer is arranged outside the heating element, and a metal cylinder body is used for supporting and transmitting outside the insulating layer. Although this construction ensures that the material is not contaminated during heating, it has a number of drawbacks.
1, because the strength is ensured, the high-purity ceramic tile needs to have enough thickness, and the distance between the heating element and the material is long;
2, the processing and manufacturing of the high-purity ceramic tile are difficult, and the production cost is high;
3, along with the lapse of the service time, the high-purity ceramic brick joints are increased in the process of thermal expansion and cold contraction, and external heat-insulating materials can leak into a hearth through the brick joints to pollute materials;
4, the high-purity ceramic brick is difficult to construct by masonry;
and 5, the heating element has poor heat transfer effect and is easy to damage.
Disclosure of Invention
Aiming at the defects of the existing rotary kiln, the invention provides the hearth for the rotary electric heating kiln and the rotary kiln body manufactured by the hearth for preventing the heat-insulating material from leaking into the hearth, and the hearth has good heat conduction effect, low production cost and high connection strength.
The following technical scheme is provided for realizing the purpose of the invention: the hearth for the rotary electric heating kiln comprises at least one section of hearth wall and is characterized in that the hearth wall is formed by a plurality of tube bodies which are closely distributed around the circle center, and heating elements are arranged in the tube bodies.
Preferably, the chamber wall is provided with at least one circle of pipe bodies with the same pipe diameter or at least one circle of pipe bodies with different pipe diameters.
Preferably, the tube body is made of an insulating material. Still more preferably, the insulating material is ceramic or fused silica or silicon carbide having an alumina content of 75% or more.
Preferably, the bore walls of the upper and lower adjacent segments are joined by a joint combination. Most preferably, the joint is an annular disc body, and the annular disc body is provided with a connecting hole which is arranged on the pipe body.
Preferably, the heating element is one or a combination of a heating resistance wire, a heating pipe, a silicon carbon rod, a silicon molybdenum rod and carbon fiber.
The rotary kiln body is characterized by comprising a metal cylinder with a transmission device, a heat-insulating material layer arranged on the inner wall of the metal cylinder, a refractory brick layer arranged in the heat-insulating material layer and a hearth arranged on the inner side of the refractory brick layer.
Preferably, a plurality of hearth compacting devices with prestress, which are arranged around the circle center, are arranged among the metal cylinder, the heat-insulating material layer and the refractory brick layers, and the hearth compacting devices compact the hearth walls of the hearth.
Preferably, the hearth compressing device comprises a compressing support which is fixedly arranged on the wall of the metal cylinder, a compressing rod and a compressing spring, one end of the compressing support penetrates through the compressing support, the other end of the compressing rod penetrates through the metal cylinder, the heat-insulating material layer and the refractory brick layer to be in compression joint with the hearth wall, the compressing spring is limited and compressed between the compressing support and the top end of the compressing rod, and the compressing rod is used for compressing the pressure of the hearth wall through the compressing spring.
When the temperature of the hearth rises and expands in the radial direction, the pipe bodies forming the hearth also shrink and expand in the radial direction, so that the gap between the pipe bodies is enlarged, and the spring drives the pressing rod to automatically adjust the pressure, so that the gap between the pipe bodies is automatically adjusted, and the gap between the pipe bodies is as small as possible. The sealing performance of the hearth is ensured.
The invention has the beneficial effects that: 1. high-purity ceramic bricks with high processing cost are not needed; 2. on the premise of not contacting with the material, the heating element is closer to the material to be heated, and the heating effect is better; 3. the hearth formed by the ceramic tubes with one or more layers is easier to solve the fine change of the gap of the hearth material with the inner layer in the expansion with heat and contraction with cold through the additional prestress of the outer layer; 4. the combined structure of the hearth reduces the difficulty of masonry construction and later maintenance.
Drawings
FIG. 1 is a cross-sectional view of a kiln body of a conventional rotary kiln.
Fig. 2 is a cross-sectional view of the kiln body of the rotary kiln of example 1.
Fig. 3 is a cross-sectional view of the kiln body of the rotary kiln of example 2.
Fig. 4 is a cross-sectional view of a rotary kiln body of example 3.
Fig. 5 is a cross-sectional view of the kiln body of the rotary kiln of example 4.
FIG. 6 is a schematic view of a furnace hold down device.
Detailed Description
Example 1: the rotary kiln body manufactured by the hearth for the rotary electric heating kiln comprises a metal cylinder 1 with a transmission device, a heat preservation material layer 2 arranged on the inner wall of the metal cylinder 1, a refractory brick layer 3 arranged inside the heat preservation material layer 2 and a hearth 4 arranged on the inner side of the refractory brick layer 3.
A plurality of hearth compacting devices 5 with prestress, which are arranged around the circle center, are arranged among the metal cylinder 1, the heat insulation material layer 2 and the refractory brick layer 3, and the hearth compacting devices 5 compact the hearth wall of the hearth 4. The hearth compressing device 5 comprises a compressing support 5.1 which is fixedly arranged on the wall of the metal cylinder 1, one end of the compressing support is penetrated in the compressing support 5.1, the other end of the compressing support penetrates through the metal cylinder 1, the heat-insulating material layer 2 and the firebrick layer 3 to be in compression joint with a compressing rod 5.2 and a compressing spring 5.3 which are arranged on the hearth wall of the hearth 4 in a compression joint mode, the compressing spring 5.3 is sleeved at the upper end of the compressing rod 5.2, the top end of the compressing spring 5.3 is connected with the top end of the compressing support 5.1, the top end of the compressing spring 5.3 is limited on a step stop of the compressing rod 5.2, and the compressing rod 5.2 is used for compressing the pressure of the hearth wall through the elasticity of the compressing spring 5.3.
The hearth 4 comprises at least one section of hearth wall, the hearth wall is formed by a plurality of pipe bodies 4.1 which are closely distributed around the circle center and are arranged into inner and outer circles with the same pipe diameter, no gap is reserved between the outer diameters of the adjacent pipe bodies 4.1 in a tangential mode, and heating resistance wires are arranged inside the pipe bodies 4.1. Each tube body 4.1 corresponding to the outer ring is provided with a hearth compressing device 5, each outer ring tube body is correspondingly compressed by a compressing rod 5.2, the inner ring tube body props against the outer ring tube body, the outer ring tube body props against the compressing rod 5.2, the spring is compressed tightly, when the temperature drops, the spring pushes the compressing rod 5.2 to press the outer ring tube body to the inner ring tube body, and therefore gaps among tube bodies forming a hearth are effectively kept as small as possible, and the tightness of the hearth is guaranteed.
The bore walls of the upper and lower adjacent sections are joined in combination by a joint 6. The joint 6 is an annular disc body, the annular disc body is provided with a connecting hole matched with the inner ring of the tube body and the outer ring of the tube body, the bottom ends and the tail ends of the upper tube body and the lower tube body are inserted into the connecting hole, and the connection and the fixation of the chamber walls of the upper adjacent section and the lower adjacent section are realized, so that the combination of a plurality of sections of hearths is realized.
The material of the tube body 4.1 is ceramic with the alumina content of more than 75 percent.
The temperature of each section of hearth 4 is controlled by heating resistance wires arranged in each section of pipe body, so that the temperature of each section can be controlled respectively or in a plurality of sections or in a whole centralized manner, and various control requirements of the temperature in the kiln are met.
Example 2: referring to the embodiment 1, the other characteristics are not changed, the chamber wall is formed by a plurality of pipe bodies 4.1 which are closely distributed around the circle center and are arranged in a circle with different pipe diameters, no gap is reserved between the outer diameters of the adjacent pipe bodies in a tangential manner, and heating resistance wires are arranged inside the pipe bodies 4.1. A hearth pressing device is arranged corresponding to each pipe body, and a pressing rod correspondingly presses each pipe body.
Example 3: referring to the embodiment 1, the other characteristics are not changed, the chamber wall is formed by a plurality of pipe bodies 4.1 which are closely distributed around the circle center and are arranged in a circle with the same pipe diameter, no gap is reserved between the outer diameters of the adjacent pipe bodies in a tangential manner, and heating resistance wires are arranged in the pipe bodies. A hearth pressing device 5 is arranged corresponding to each pipe body, and a pressing rod 5.2 correspondingly presses each pipe body.
Example 4: referring to the embodiment 1, the other characteristics are not changed, the chamber wall is formed by a plurality of pipe bodies 4.1 which are closely distributed around the circle center and are arranged in three circles with different pipe diameters, no gaps are reserved between the outer diameters of the adjacent pipe bodies in a tangential manner, and heating resistance wires are arranged in the pipe bodies. The furnace hold-down device is arranged on each pipe body corresponding to the outermost ring, the hold-down rod 5.2 correspondingly holds down each pipe body of the outermost ring, the inner two-ring pipe bodies prop against the pipe body of the outermost ring, the outer-ring pipe bodies prop against the hold-down rod, the springs are pressed more tightly, when the temperature drops, the springs push the hold-down rod to press the pipe bodies of the outermost ring to the inner two-ring pipe bodies, and therefore gaps among pipe bodies forming the furnace are effectively kept as small as possible, and the tightness of the furnace is guaranteed.
Claims (5)
1. The rotary kiln body manufactured by the hearth for the rotary electric heating kiln comprises a hearth and at least one section of hearth wall, and is characterized by comprising a metal cylinder with a transmission device, a heat preservation material layer arranged on the inner wall of the metal cylinder, a refractory brick layer arranged inside the heat preservation material layer and a hearth on the inner side of the refractory brick layer, wherein a plurality of hearth compacting devices with prestress arranged around a circle center are arranged among the metal cylinder, the heat preservation material layer and the refractory brick layer, the hearth compacting devices compact the hearth wall, the hearth wall is formed by tightly arranging a plurality of pipe bodies around the circle center, heating elements are arranged inside the pipe bodies, the hearth wall is made of at least one circle of pipe bodies with the same pipe diameter or at least one circle of pipe bodies with different pipe diameters, the pipe bodies are made of insulating materials, and the heating elements are one or a combination of heating resistance wires, heating pipes, silicon carbon rods, silicon-molybdenum rods and carbon fibers.
2. The rotary kiln body manufactured by the hearth for the rotary electric heating kiln according to claim 1, wherein the insulating material is ceramic or fused quartz or silicon carbide with the alumina content of more than 75%.
3. The rotary kiln body manufactured by the hearth for the rotary electric heating kiln according to claim 1, wherein the hearth walls of the upper and lower adjacent sections are connected by a joint combination.
4. The rotary kiln body manufactured by the hearth for the rotary electric heating kiln as recited in claim 3, wherein the joint is an annular disc body, and the annular disc body is provided with a connecting hole for the tube body.
5. The rotary kiln body manufactured by the hearth for the rotary electric heating kiln according to claim 1, wherein the hearth pressing device comprises a pressing support installed and fixed on the wall of the metal cylinder, a pressing rod with one end penetrating through the pressing support and the other end penetrating through the metal cylinder, the heat-insulating material layer and the refractory brick layer to be pressed on the hearth wall of the hearth, and a pressing spring, wherein the pressing spring is limited and compressed between the pressing support and the top end of the pressing rod, and the pressing spring is used for applying pressure to the pressing rod to press the hearth wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810876616.3A CN108955239B (en) | 2018-08-03 | 2018-08-03 | Hearth for rotary electric heating kiln and rotary kiln body manufactured by hearth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810876616.3A CN108955239B (en) | 2018-08-03 | 2018-08-03 | Hearth for rotary electric heating kiln and rotary kiln body manufactured by hearth |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108955239A CN108955239A (en) | 2018-12-07 |
| CN108955239B true CN108955239B (en) | 2024-04-16 |
Family
ID=64467119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810876616.3A Active CN108955239B (en) | 2018-08-03 | 2018-08-03 | Hearth for rotary electric heating kiln and rotary kiln body manufactured by hearth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108955239B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116697740B (en) * | 2023-08-02 | 2023-10-03 | 佛山市天禄智能装备科技有限公司 | High-temperature rotary furnace for continuously producing silicon-carbon material |
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| FR914062A (en) * | 1945-09-05 | 1946-09-27 | Rotary plaster oven also suitable for high temperature overbaking | |
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| CN106369994A (en) * | 2016-10-28 | 2017-02-01 | 王彬海 | Rotary kiln fluidization roasting device and process |
| CN206724464U (en) * | 2017-03-27 | 2017-12-08 | 康志辉 | A kind of coiled warming stove |
| CN208382857U (en) * | 2018-08-03 | 2019-01-15 | 江苏奥能耐火材料有限公司 | A kind of rotary kiln body for turning round electric heating kiln burner hearth and its production |
-
2018
- 2018-08-03 CN CN201810876616.3A patent/CN108955239B/en active Active
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| GB163175A (en) * | 1920-03-15 | 1921-05-19 | Stefanus Johannes Vermaes | Improvements in or relating to rotary kilns |
| FR914062A (en) * | 1945-09-05 | 1946-09-27 | Rotary plaster oven also suitable for high temperature overbaking | |
| JPH07234073A (en) * | 1994-02-24 | 1995-09-05 | Murata Mfg Co Ltd | Heat treating furnace |
| JPH09156918A (en) * | 1995-09-29 | 1997-06-17 | Mitsubishi Chem Corp | Production of powdery synthetic quartz |
| US5695329A (en) * | 1996-09-24 | 1997-12-09 | Orcutt; Jeffrey W. | Rotary kiln construction with improved insulation means |
| JP2006206856A (en) * | 2005-01-31 | 2006-08-10 | Kenji Yamane | Manufacturing method of carbide and carbide manufacturing unit |
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| CN208382857U (en) * | 2018-08-03 | 2019-01-15 | 江苏奥能耐火材料有限公司 | A kind of rotary kiln body for turning round electric heating kiln burner hearth and its production |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108955239A (en) | 2018-12-07 |
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