CN112050629A - Kiln with high middle cavity and low ends - Google Patents
Kiln with high middle cavity and low ends Download PDFInfo
- Publication number
- CN112050629A CN112050629A CN201910490387.6A CN201910490387A CN112050629A CN 112050629 A CN112050629 A CN 112050629A CN 201910490387 A CN201910490387 A CN 201910490387A CN 112050629 A CN112050629 A CN 112050629A
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- China
- Prior art keywords
- heat exchange
- zone
- kiln
- temperature sintering
- area
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Classifications
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- 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
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- 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
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
- F27B9/202—Conveyor mechanisms therefor
- F27B9/203—Conveyor mechanisms therefor having ramps
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- 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
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/02—Skids or tracks for heavy objects
- F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/02—Charges containing ferrous elements
- F27M2001/023—Ferrites
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Tunnel Furnaces (AREA)
Abstract
The invention relates to a kiln with a high middle part and low two ends, which comprises: a kiln body; the high-temperature sintering area is arranged in the kiln body, and the first heat exchange area and the second heat exchange area are arranged on two sides of the high-temperature sintering area, and the position of the high-temperature sintering area is higher than that of the first heat exchange area and that of the second heat exchange area, so that gas with high temperature in the kiln body can flow to the high-temperature sintering area, and heat can be stored in the high-temperature sintering area; and a transmission device for conveying materials, which penetrates through the first heat exchange zone, the high-temperature sintering zone and the second heat exchange zone, wherein the transmission device is positioned at a higher position of the section of the high-temperature sintering zone than the section of the first heat exchange zone and the section of the second heat exchange zone.
Description
Technical Field
The invention relates to a kiln for sintering materials, in particular to a kiln with a high middle part and low two ends of a cavity.
Background
The existing sintering kiln of ferrite permanent magnets is in a tunnel shape, and the wall body of the kiln is composed of various heat-insulating and heat-conducting materials such as light clay bricks, microporous heat-insulating bricks, light high-alumina, mullite and the like. The hollow part of the kiln is a furnace chamber, and the furnace chamber extends along the length direction and penetrates through two ends of the kiln to form an inlet and an outlet. The kiln is divided into a preheating zone, a medium-temperature sintering zone, a high-temperature sintering zone and a cooling zone from an inlet to an outlet according to the temperature, wherein the preheating zone and the high-temperature sintering zone are provided with electric heating rods at the upper part and the bottom of the inner wall of the furnace chamber.
The material to be sintered is conveyed in a single direction along the direction from the inlet to the outlet of the furnace chamber by the conveying device and undergoes the processes of preheating → sintering → cooling.
The existing ferrite permanent magnet sintering kiln is provided with a unidirectional conveyer belt, a blowing device is arranged at a discharge port or a position nearby, and an air extractor is arranged at a feed port or a position nearby. The air blowing device includes a blower, an air duct, which may be a plurality of air ducts, connected to the cooling area of the cavity. The air extraction device comprises an air extraction motor, an air extraction pipeline and a filtering device, and the air extraction pipeline is connected with the preheating zone; when the air-cooling device works, the air blower of the air-blowing device conveys outside air to the cooling area of the furnace chamber, and the air is pumped out from the preheating area by the air pumping device, so that the air flows from the cooling area to the high-temperature area, flows to the preheating area again and is discharged to the outside. In the oven cavity, the air moves in the opposite direction to the direction of transport of the material. In the high-temperature sintering zone, oxygen in the air and the materials are consumed by chemical reaction. However, since the oxygen content in the air is only 21%, more heat energy is carried away by the gas which does not participate in the reaction in the gas flow and is discharged to the atmosphere, and the part of heat energy is not utilized. The exhausted air passes through a filter device and enters the atmosphere.
The existing kiln is in one-way horizontal linear transmission, the structure is not beneficial to heat storage of the kiln, and more heat is dissipated from two sides of the kiln chamber, so that energy waste is caused.
Disclosure of Invention
The invention aims to provide a kiln system with a high middle part and low two ends of a furnace chamber, which can effectively store gas with high temperature in the furnace chamber. The gas with high temperature in the furnace cavity flows to the high place, the traditional furnace is transformed into a mode that the middle high ends are low, the furnace structure with bidirectional feeding is combined, the outflow of the heated gas from the openings at the two ends of the furnace cavity is reduced, the gas with high temperature is stored in the position of the middle high-temperature area, and the energy is saved.
The invention provides a kiln with a high middle part and low two ends of a cavity, which comprises:
a kiln body;
the high-temperature sintering area is arranged in the kiln body, and the first heat exchange area and the second heat exchange area are arranged on two sides of the high-temperature sintering area, and the position of the high-temperature sintering area is higher than that of the first heat exchange area and that of the second heat exchange area, so that gas with high temperature in the kiln body can flow to the high-temperature sintering area, and heat can be stored in the high-temperature sintering area;
and a transmission device for conveying materials, which penetrates through the first heat exchange zone, the high-temperature sintering zone and the second heat exchange zone.
Preferably, the transmission means is a roller conveyor belt, and the sections located in the high-temperature sintering zone are located at a higher position than the sections located in the first and second heat exchange zones.
Preferably, the section of the roller conveyer belt located in the high-temperature sintering zone has a middle high end low section shape.
Preferably, the section of the roller conveyor belt located in the high temperature sintering zone has a straight cross-sectional shape.
Preferably, the section of the roller conveyor belt located in the first heat exchange zone and the section located in the second heat exchange zone have a cross-sectional shape gradually increasing from the kiln port towards the heat exchange zone.
Preferably, the section of the roller conveyor belt located in the first heat exchange zone and the section located in the second heat exchange zone are at an angle α in the range of 1 ° to 5 ° to the horizontal.
Preferably, the temperature of the high-temperature sintering zone is 1200 ± 5% celsius.
Preferably, the first heat exchange zone and the second heat exchange zone are provided with temperature zones from the high temperature sintering zone to the furnace port, wherein the temperature zones are 700-800 ℃, 300-400 ℃, 150-250 ℃ and 50-100 ℃.
Preferably, the material conveyor is a bidirectional roller conveyor that conveys material from two opposite directions.
In addition, the invention also comprises an oxygen generator for delivering oxygen to the high-temperature sintering area.
Compared with the prior art, the horizontal kiln has the beneficial technical effects that the phenomenon that heat moves to a high position is utilized, the traditional horizontal kiln is reformed into a structure with a high middle part and two low ends, the heat dissipated from two sides of the kiln is reduced as much as possible, and the heat is stored in the sintering position of the middle high-temperature area, so that the energy consumption is saved.
The two-way feeding kiln with the middle high and the two ends low can be applied to a wide range of fields, such as various heat treatment annealing devices of ceramic sintering kilns, closestool sintering kilns, inlet and outlet channels of steel-making blast furnaces and the like, and also surface treatment devices, such as paint drying devices, drying devices in wood processing processes, drying devices after motor paint dipping, cement sintering processes and the like.
Drawings
FIG. 1 is a schematic structural diagram of a kiln system according to a first embodiment of the invention;
fig. 2 is a schematic structural diagram of a kiln system according to a second embodiment of the invention.
Description of reference numerals: 1-a frame; 2-a transmission device; 3-furnace body; 4-an oxygen generator; 5-exhaust chimney; 6-cleaning the opening; 7-oxygen injection port; 8-an electric heating rod; 9-firewall; 10-high temperature zone; 11-a heat exchange zone; 12-heat preservation and sealing area.
Detailed Description
According to the invention, the horizontal cavity of the traditional kiln is reformed into a form that the middle is high and the two ends are low according to the phenomenon that heat moves to the high position, the kiln with the middle high and the two ends are low can reduce the heat dissipated from the two sides of the kiln, and the heat is stored at the middle high point of the kiln, namely the position of the high-temperature area 10, and is required by material sintering.
Fig. 1 and 2 show a kiln of the invention having a high middle and low ends, comprising: a kiln body or a furnace body 3 made of refractory materials, wherein a kiln cavity is arranged inside the kiln body; the high-temperature sintering area 10 is arranged in the kiln body, and the first heat exchange area 11 and the second heat exchange area 11 'are arranged on two sides of the high-temperature sintering area, and the position of the high-temperature sintering area is higher than that of the first heat exchange area 11 and the second heat exchange area 11', so that gas with high temperature in the kiln body flows to the high-temperature sintering area, and heat is stored in the high-temperature sintering area; a transmission 2 for conveying the material, which extends through the first heat exchange zone 11, the high temperature sintering zone 10 and the second heat exchange zone 11 ', and which is located at a higher position in the section of the high temperature sintering zone than in the sections of the first heat exchange zone 11 and the second heat exchange zone 11'. The transmission 2 of the present invention is a roller conveyor belt and is a two-way roller conveyor belt that conveys material from two opposite directions.
The roller conveyor belt of the invention is erected on a frame 1. In one embodiment, as shown in fig. 1, the section of the roller conveyor belt located in the high temperature sintering zone has a low cross-sectional shape with a high middle and two ends. In another embodiment, as shown in fig. 2, the section of the roller conveyor belt located in the high temperature sintering zone has a straight cross-sectional shape.
As shown in fig. 1 and 2, the section of the roller conveyor belt located in the first heat exchange zone 11 and the section located in the second heat exchange zone 11' have a cross-sectional shape gradually increasing from the kiln ports towards said heat exchange zones. Wherein the section of the roller conveyer belt located in the first heat exchange area and the section located in the second heat exchange area form an included angle alpha ranging from 1 to 5 degrees with the horizontal plane so as to smoothly convey materials.
The temperature of the high-temperature sintering zone of the invention is 1200 plus or minus 5 percent. The first heat exchange area and the second heat exchange area are both provided with temperature areas at 800 ℃, 300-.
In addition, the invention uses the oxygen generator 4 to supply oxygen to the high-temperature sintering area so as to improve the combustion temperature and improve the material reaction efficiency.
The invention will be further described with reference to fig. 1 and 2.
In embodiment 1 shown in fig. 1, the kiln system of this embodiment, which has a high middle and low ends, structurally comprises a frame 1, a transmission device 2, a furnace body 3, an oxygen generator 4, an exhaust gas discharge chimney 5, a cleaning port 6, an oxygen injection port 7, an electric heating rod 8 and a firewall 9. The frame 1 is arranged at the bottom and supports the whole furnace body 3. The transmission device 2 is arranged between the frame 1 and the furnace body 3, the track of the transmission device 2 and the two ends of the furnace body 3 are at the lower part, and the middle part is at the high part. The furnace body 3 divides the furnace body 3 into a plurality of sections according to the temperature, and the electric heating rod 8 is arranged in the middle of the furnace body and arranged at the upper side and the lower side of the transmission device 2. The two ends of the electric heating rod 8 are provided with fire-proof walls 9, and the fire-proof walls can effectively separate one section of the middle from the two sides of the fire-proof walls, so that heat loss towards the two sides is prevented. This section between the firewalls 9 is generally referred to as the high temperature zone 10, and the sides of the high temperature zone 10 are referred to as the heat exchange zone 11. An oxygen generator 4 is arranged at the outer side of the furnace body 3 corresponding to the high-temperature area 10, and the oxygen generator 4 delivers oxygen into the furnace body 3 through an oxygen injection port 7. And waste gas discharge chimneys 5 are arranged at two ends of the furnace body 3 and contain active carbon, and waste gas released in the material sintering reaction process is discharged after being adsorbed by the active carbon. A cleaning opening is also arranged below the furnace body 3, and if residue or residue appears in the furnace body 3, the residue or residue can be cleaned from the cleaning opening.
The kiln system with the high middle part and the low two ends is integrally symmetrical by a vertical plane where a central point of a kiln is located, and the optimal value range of an included angle alpha formed by the intersection of the plane where the transmission device 2 is located and the horizontal plane is 1-5 degrees, so that the permanent magnet cannot topple over. The kiln is generally long and straight in design, which facilitates the full reaction of the materials in the furnace body 3. The arrangement of 1-5 degrees can effectively store the heat in the furnace body 3 under the condition of not influencing the transportation of materials in the furnace body 3, and the energy utilization efficiency can be improved to the maximum extent by combining the working mode of bidirectional feeding, thereby achieving the purposes of energy conservation and emission reduction.
In the second embodiment of the present invention shown in fig. 2, the section of the transmission device 2 of the kiln system in the high temperature zone 10 is adjusted, and the original inclined design in the high temperature zone 10 is changed into a horizontal design. The optimum value range of the included angle alpha between the inclined working plane of the transmission device 2, namely the working plane of the heat exchange area 11 and the horizontal plane is also between 1 and 5 degrees, so that the permanent magnet can not topple over. The side projection of the whole working plane of the transmission device 2 and the horizontal plane is in a trapezoidal shape.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.
Claims (10)
1. A kiln with a high middle cavity and low ends is characterized by comprising:
a kiln body;
the high-temperature sintering area is arranged in the kiln body, and the first heat exchange area and the second heat exchange area are arranged on two sides of the high-temperature sintering area, and the position of the high-temperature sintering area is higher than that of the first heat exchange area and that of the second heat exchange area, so that gas with high temperature in the kiln body can flow to the high-temperature sintering area, and heat can be stored in the high-temperature sintering area;
and a transmission device for conveying materials, which penetrates through the first heat exchange zone, the high-temperature sintering zone and the second heat exchange zone.
2. The kiln according to claim 1, characterized in that the transmission means are roller conveyors and in that the sections located in the high-temperature sintering zone are located at a higher level than the sections located in the first and second heat exchange zones.
3. The kiln according to claim 2, characterized in that the section of the roller conveyor belt located in the high-temperature sintering zone has a high-middle-end-low cross-sectional shape.
4. The kiln according to claim 2 or 3, characterized in that the section of the roller conveyor belt located in the high-temperature sintering zone has a straight cross-sectional shape.
5. Kiln according to claim 2 or 3, characterized in that the section of the roller conveyor belt located in the first heat exchange zone and the section located in the second heat exchange zone have a gradually increasing cross-sectional shape from the kiln port towards the heat exchange zone.
6. The kiln according to claim 4 or 5, characterized in that the section of the roller conveyor belt located in the first heat exchange zone and the section located in the second heat exchange zone have an angle α in the range between 1 ° and 5 ° with the horizontal.
7. The kiln according to claim 6, characterized in that the temperature of the high-temperature sintering zone is 1200 ± 5% Celsius.
8. The furnace as recited in claim 7, wherein the first heat exchange zone and the second heat exchange zone each have temperature zones from about 700 ℃ - > 800 ℃, 300 ℃ - > 400 ℃, 150 ℃ - > 250 ℃ and 50-100 ℃ near the high temperature sintering zone to the furnace port.
9. The kiln of claim 8, wherein the material conveyor is a bidirectional roller conveyor that conveys material from two opposite directions.
10. The kiln of claim 4 or 5, further comprising an oxygen generator for delivering oxygen to the high temperature sintering zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910490387.6A CN112050629B (en) | 2019-06-06 | 2019-06-06 | Ferrite permanent magnet sintering kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910490387.6A CN112050629B (en) | 2019-06-06 | 2019-06-06 | Ferrite permanent magnet sintering kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112050629A true CN112050629A (en) | 2020-12-08 |
| CN112050629B CN112050629B (en) | 2022-12-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910490387.6A Active CN112050629B (en) | 2019-06-06 | 2019-06-06 | Ferrite permanent magnet sintering kiln |
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| Country | Link |
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| CN (1) | CN112050629B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201189154Y (en) * | 2008-04-22 | 2009-02-04 | 曾跃平 | Dishware drying sterilizing device |
| CN101839635A (en) * | 2010-05-26 | 2010-09-22 | 张宗报 | Tunnel furnace |
| EP2684967A1 (en) * | 2012-07-10 | 2014-01-15 | Linde Aktiengesellschaft | Continuous furnace |
| CN204085163U (en) * | 2014-07-31 | 2015-01-07 | 淄博鹏达环保科技有限公司 | Outer hot oxygen-complementing type roller kilns |
| US20150345865A1 (en) * | 2014-06-03 | 2015-12-03 | Usnr, Llc | Lumber kiln conveyor system |
| CN106017073A (en) * | 2016-07-18 | 2016-10-12 | 江苏时瑞电子科技有限公司 | Industrial kiln |
-
2019
- 2019-06-06 CN CN201910490387.6A patent/CN112050629B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201189154Y (en) * | 2008-04-22 | 2009-02-04 | 曾跃平 | Dishware drying sterilizing device |
| CN101839635A (en) * | 2010-05-26 | 2010-09-22 | 张宗报 | Tunnel furnace |
| EP2684967A1 (en) * | 2012-07-10 | 2014-01-15 | Linde Aktiengesellschaft | Continuous furnace |
| US20150345865A1 (en) * | 2014-06-03 | 2015-12-03 | Usnr, Llc | Lumber kiln conveyor system |
| CN204085163U (en) * | 2014-07-31 | 2015-01-07 | 淄博鹏达环保科技有限公司 | Outer hot oxygen-complementing type roller kilns |
| CN106017073A (en) * | 2016-07-18 | 2016-10-12 | 江苏时瑞电子科技有限公司 | Industrial kiln |
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| Publication number | Publication date |
|---|---|
| CN112050629B (en) | 2022-12-30 |
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