CN210718603U - Electric heating rotary kiln - Google Patents
Electric heating rotary kiln Download PDFInfo
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- CN210718603U CN210718603U CN201921745742.1U CN201921745742U CN210718603U CN 210718603 U CN210718603 U CN 210718603U CN 201921745742 U CN201921745742 U CN 201921745742U CN 210718603 U CN210718603 U CN 210718603U
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- heating
- rotary
- kiln
- rotary kiln
- heating body
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- 238000005485 electric heating Methods 0.000 title claims description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 103
- 239000000463 material Substances 0.000 claims abstract description 52
- 239000011810 insulating material Substances 0.000 claims abstract description 15
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 239000012774 insulation material Substances 0.000 claims abstract description 3
- 229910052723 transition metal Inorganic materials 0.000 claims description 10
- 150000003624 transition metals Chemical class 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910001182 Mo alloy Inorganic materials 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- -1 transition metal nitride Chemical class 0.000 claims description 2
- 238000000034 method Methods 0.000 description 10
- 239000003245 coal Substances 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000004020 conductor Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 240000006909 Tilia x europaea Species 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The utility model provides an electrical heating rotary kiln, includes revolving tube, heat preservation heat-insulating part, drive wheel, bearing wheel, heating system, kiln head feeding and kiln tail ejection of compact part, its characterized in that: the inner wall of the rotary pipe or the heat insulation part is made of an insulation material; at least two or two groups of electrodes are fixed on the insulating material, one or one group of electrodes is an anode, the other one or one group of electrodes is a cathode, a heating body is arranged between the anode and the cathode, alternating current or direct current voltage is applied to the anode and the cathode, current flows from the anode to the heating body and then to the cathode, the heating body is used as a resistor to generate heat, and the heating body heats logistics. Compare with other electrical heating rotary kilns, its advantage can make interior heating electric heat rotary kilns, and the material is heated more evenly, especially to the material that needs high temperature more than rotary kiln 900 ℃, atmosphere protection and electric conductivity are poor, the utility model discloses a rotary kiln has huge advantage.
Description
Technical Field
The invention relates to a novel electric heating rotary kiln, and belongs to the technical field of kilns.
Background
The rotary kiln is important heating and calcining equipment in chemical industry, material industry and even medicine industry, and is very widely applied. The heating mode can be divided into external heating and internal heating according to the position of a heat source in the rotary kiln; according to different types of heat sources, the method can be divided into electric heating, gas heating and coal injection heating; there is also a heating method in which a fuel such as coal is mixed into the material to perform combustion.
The method is characterized in that the rotary kiln is internally heated, coal and fuel gas are injected into the kiln chamber of the rotary kiln, air or oxygen is introduced for combustion, the suitable heated material has certain oxidation resistance or no requirement on oxidizing atmosphere, and the material has certain tolerance degree on pollution brought by fuel or has low requirement on impurity pollution. For example, in a common lime kiln, an electric heating rotary kiln is adopted due to high requirements on the quality of lime in certain application fields, such as Chinese patent CN 202543076U. Therefore, the heating method by injecting coal and air or adding coal to the material to be heated is still relatively limited in the kind of the material to be heated.
An external heating coal-fired gas rotary kiln is characterized in that a rotary pipe is generally made of metal so as to be beneficial to transferring heat to heating materials in the rotary pipe. The metal rotary pipe continuously works in a combustion heat source and is easy to oxidize and damage. Even then, the efficiency of heat transfer is low, so there is only a need for internal heat coal or gas fired rotary kilns; in addition, some heat transfer methods have been developed in which hot gas conduits are passed through the interior of the furnace chamber, such as the rotary kiln disclosed in chinese patent CN 201915016U.
For the conditions of higher temperature control precision requirement, high material cleanliness requirement, unsuitability for oxidizing atmosphere of materials or inconvenience of coal and gas burning, an electrothermal rotary kiln is generally adopted, such as the rotary kilns disclosed in world patents WO 2009/028541A 1 and JP2000161859 (A). However, the externally heated electric heating rotary kiln also has the problem of low heat transfer efficiency, and the rotary pipe is generally made of metal parts which are easy to corrode under the high-temperature condition, and the use temperature is generally not more than 1000 ℃. For example, in chinese patent CN201697448, a material plate is disposed on the inner wall of a rotary tube to increase the heat transfer area and turn the material, and CN201555443, the lower part and both sides of the rotary tube are heated to increase the heat receiving surface and the heat transfer surface of the rotary tube.
As can be seen from the above documents, the thermal efficiency of the external heating rotary kiln is always relatively low, and for higher heat transfer efficiency, the rotary pipe generally uses a metal pipe, which is easily oxidized at high temperature and has a maximum use temperature lower than 1000 ℃.
In the internal heating rotary kiln, the coal and gas heating mode is generally only used for calcining cement and ore due to the limitation of low oxidizing atmosphere and cleanliness. An electrothermal internal heating rotary kiln is composed of rotary tube, insulating material in the inner surface of rotary tube, and electrothermal element in the inner wall of insulating material or near the inner wall. In order to improve the heat transfer efficiency, patent CN202166304U discloses an electric heating element disposed in a graphite block, or directly uses graphite as a heating element, such as CN 102393138A. Chinese patent CN2627438 discloses a stainless steel tube mounted on the central axis of a rotary tube of a rotary kiln, coated with an insulating material, and an electric heating element disposed in the insulating material. There is also rotary kiln CN102419086A which combines microwave heating and electric heating element heating.
Chinese patent CN103335513B discloses an electrically heated internal heating rotary kiln, but the kiln requires that the material to be heated can have a certain conductivity and has a limited application range.
In summary, the existing rotary kiln, whether the rotary kiln is an external heating rotary kiln or an internal heating rotary kiln, whether the rotary kiln is an electric heating rotary kiln or a coal-fired gas heating rotary kiln, heats the materials in an indirect heating mode, and the heat has a heat transfer process from a heating body to the heated materials, so that the process causes a series of problems of low heat efficiency, complex equipment, short service life of a rotary pipe and the like. In addition, indirect heating methods, including microwave heating methods, are also one of the causes of low thermal efficiency, because they indiscriminately heat materials such as heat-insulating refractory materials and rotary pipes in rotary kilns. Or require the material to have some electrical conductivity. The rotary kiln equipment is different from the existing rotary kiln, current is led into positive and negative electrodes arranged in the kiln, a heating body is arranged between the positive and negative electrodes, and materials are directly contacted with the heating body so as to heat the materials. High heat transfer efficiency, simple equipment, convenient heat preservation and wide raw material application range.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides an internal heating rotary kiln in an electric heating mode, which enables materials to be in direct contact with a heating body, and aims to solve the problems that in the prior electric heating rotary kiln technology, the heat transfer efficiency from a heating element to the materials to be heated is low, the structure is complex, or the materials to be heated need to have certain electric conductivity.
The purpose of the utility model is realized like this: the invention provides an electric heating rotary kiln which enables materials to be in direct contact with a heating body. The invention leads current into positive and negative electrodes arranged in the kiln, a heating body is arranged between the positive and negative electrodes, and the material is directly contacted with the heating body, thereby realizing the heating of the material. The internal heat rotary kiln of the utility model simplifies the heat transfer process of transferring heat from the electric heating element to the material, thereby improving the heat efficiency and reducing the energy consumption; meanwhile, the rotary kiln can heat materials with poor conductivity and even insulation.
The specific technical scheme of the utility model as follows.
The utility model provides an electrical heating rotary kiln, includes parts such as gyration pipe, heat preservation heat insulation part, drive wheel, bearing wheel, heating power supply, kiln head feeding and kiln tail ejection of compact, its characterized in that: the inner wall of the rotary pipe or the heat insulation part is made of an insulation material; at least two or two groups of electrodes are fixed on the insulating material, wherein one or one group of electrodes is an anode, the other one or one group of electrodes is a cathode, a heating body is arranged between the anode and the cathode, alternating current or direct current voltage is applied to the anode and the cathode, current flows from the anode to the heating body and then to the cathode, so that the heating body generates heat as a resistor, and other materials except the heating body in the kiln chamber of the electric heating rotary kiln are heated by the heating body; the positive pole and/or the negative pole are/is electrically connected with the conducting ring and the electric brush and further electrically connected with the heating power supply; the included angle between the rotating shaft of the rotary pipe and the horizontal plane is 0-30 degrees; the material of the heating body is one or more of graphite, silicon carbide, transition metal or alloy material thereof, silicon-molybdenum alloy, alloy of transition metal and silicon, transition metal carbide, transition metal nitride and transition metal carbonitride; the current is 5-100000 amperes (A); the alternating current or direct current voltage is 5-2000 volts (V).
Furthermore, one or more of the positive pole and the negative pole partially penetrates through the cylindrical surface of the rotary pipe and is in conductive connection with the conductive ring fixed outside the rotary pipe, and the conductive ring is in conductive connection with the heating power supply through the electric brush.
Or one or more of the positive pole and the negative pole partially penetrates through the cylindrical end face of the rotary pipe and is in conductive connection with the conductive ring and the brush inside or outside the rotary pipe.
Further, the heating element is fixed and in conductive connection with the positive electrode and/or the negative electrode.
Further, the heating element is fixed on the insulating material.
Furthermore, the heating body is arranged in a kiln chamber of the rotary kiln and rotates and/or rolls along with the materials when the rotary kiln runs.
Furthermore, other materials except the heating body in the kiln chamber of the electric heating rotary kiln have electric conductivity, and a part or all of the conductive ring and/or the electric brush are the conductive materials.
Further, the brush is a transformer, and the conductive ring is a secondary coil of the transformer.
Furthermore, the heating body is electrically connected with the positive electrode and the negative electrode, replaces part of the insulating material on the inner wall of the kiln chamber, and is fixed by the insulating material adjacent to the heating body in the circumferential direction of the rotary pipe and the insulating material between the heating body and the inner wall of the rotary pipe.
Compared with the prior art, the invention has the following advantages:
1) compare with external heating electric heat rotary kiln, electric heat rotary kiln's heat-generating body and heated material between reduce this heat transfer's of gyration pipe intermediate member, heat-generating body and material can direct contact, can heat through contact heat-conduction and convection heating, the thermal efficiency is high.
2) Compare with directly-heated type rotary kiln, electrical heating rotary kiln can be applicable to the not good material that does not conduct electricity completely even of electric conductivity.
3) Compared with other electric heating rotary kilns, the internal heating rotary kiln has simple structure and convenient maintenance.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic view of an internal heating rotary kiln according to example 1.
Fig. 2 is a schematic view of an internal heating rotary kiln according to embodiment 2.
Detailed Description
Example 1
Fig. 1 is a schematic diagram of an embodiment 1, and an electrically heated internal heat rotary kiln device for drying or heating materials includes a rotary pipe 1, a heat preservation and insulation part 3 fixed inside the rotary pipe, a kiln head feeding part 8, a kiln tail discharging part 7 and the like. The electrodes are formed by a positive electrode 2 and a negative electrode 5. The power supply is connected to the electrode 5 through the brush 52 and the conductive ring 51, and the electrode 5 is electrically connected to the heating element 11 and/or 12 through the ring-shaped electrode 53 fixed on the heat-insulating part 3. The electrode 2 enters the rotary kiln chamber from the cylindrical end surface of the rotary tube, the electrode 2 is in conductive connection with the heating body 11 and/or 12 through a spoke-shaped conductive material 23 fixed in the rotary tube, and the electrode 2 is in conductive connection with a heating power supply through an electric brush 21. The heating bodies 11 can be one or more than one heating body 12, for example, the heating bodies are also distributed uniformly along the circumference of the inner wall of the kiln chamber of the rotary kiln when the heating bodies are provided, and the heating bodies can be embedded and fixed on the inner wall of the heat-insulating part 3 or only fixed with the electrode 53 and the spoke-shaped conductive material 23 and have a gap with the heat-insulating part 3. In operation, a power current flows through the brush 21, the conductive ring 9, the electrode 2, the spoke-like conductive material 23, the heating elements 11 and/or 12, the annular electrode 53, the electrode 5, the conductive ring 51, and the brush 52 in sequence, and then returns to the heating power source. Material 6 is the preheating zone material and material 61 is the heating zone material. The heating power supply can be alternating current or direct current. When the direct current is adopted, one electrode is a positive electrode, and the other electrode is a negative electrode; when the alternating current is used, the alternating current is not called as an anode or a cathode, but for convenience, the anode or the cathode or the electrode is referred to in the invention.
In the case where the materials other than the electrode and the heating element are electrically conductive in the kiln chamber of the electric heating rotary kiln, the brush 21 and the conductive ring 9 may be eliminated, the positive electrode of the heating power source is directly connected to the electrode 2, and the heating current flows through the electrode 2 and the electric materials into the heating elements 11 and/or 12. The conductive ring and the brush are realized in the form of an electrode 2 and a conductive material.
Example 2
Fig. 2 is a schematic diagram of an electrically heated internal heat rotary kiln apparatus for drying or heating materials according to example 2. In this embodiment, the fixing mode of the heating element 11 is modified based on embodiment 1, and it can not move with the material in the radial direction of the rotary pipe, but can rotate or move with the material in the rotation direction of the rotary pipe. The advantage of this is that the heating body 11 is surrounded by the material, the heat transfer efficiency is higher; and after the heating body 11 is worn, the material inlet and the material outlet of the rotary pipe can be conveniently replaced.
Claims (9)
1. The utility model provides an electrical heating rotary kiln, includes parts such as gyration pipe, heat preservation heat insulation part, drive wheel, bearing wheel, heating power supply, kiln head feeding and kiln tail ejection of compact, its characterized in that: the inner wall of the rotary pipe or the heat insulation part is made of an insulation material; at least two or two groups of electrodes are fixed on the insulating material, wherein one or two groups of electrodes are positive electrodes, the other one or one group of electrodes are negative electrodes, a heating body is arranged between the positive electrodes and the negative electrodes, alternating current or direct current voltage is applied to the positive electrodes and the negative electrodes, current flows from the positive electrodes to the heating body and then flows to the negative electrodes, the heating body generates heat as a resistor, and the heating body heats the heated material except the heating body in the kiln chamber of the electric heating rotary kiln;
the positive pole and/or the negative pole are/is electrically connected with the conducting ring and the electric brush and further electrically connected with the heating power supply;
the included angle between the rotating shaft of the rotary pipe and the horizontal plane is 0-30 degrees;
the material of the heating body is one or more of graphite, silicon carbide, transition metal or alloy material thereof, silicon-molybdenum alloy, alloy of transition metal and silicon, transition metal carbide, transition metal nitride and transition metal carbonitride;
the current is 5-100000 amperes (A);
the alternating current or direct current voltage is 5-2000 volts (V).
2. An electrically heated rotary kiln as defined in claim 1, wherein: one or more of the positive pole and the negative pole partially penetrates through the cylindrical surface of the rotary pipe and is in conductive connection with the conductive ring fixed outside the rotary pipe, and the conductive ring is in conductive connection with the heating power supply through the electric brush.
3. An electrically heated rotary kiln as defined in claim 1, wherein: one or more of the positive pole and the negative pole partially penetrate through the cylindrical end face of the rotary tube and are in conductive connection with the conductive ring and the electric brush inside or outside the rotary tube.
4. An electrically heated rotary kiln as claimed in any one of claims 1 to 3, wherein: the heating body is fixed and in conductive connection with the anode and/or the cathode.
5. An electrically heated rotary kiln as claimed in any one of claims 1 to 3, wherein: the heating body is fixed on the insulating material.
6. An electrically heated rotary kiln as claimed in any one of claims 1 to 3, wherein: the heating body is arranged in the kiln chamber of the rotary kiln and rotates and/or rolls along with the materials when the rotary kiln operates.
7. An electrically heated rotary kiln as claimed in any one of claims 1 to 3, wherein: the material to be heated except the heating body in the kiln chamber of the electric heating rotary kiln is conductive, and part or all of the conductive ring and/or the electric brush is the material to be heated.
8. An electrically heated rotary kiln as claimed in any one of claims 1 to 3, wherein: the electric brush is a transformer, and the conducting ring is a secondary coil of the transformer.
9. An electrically heated rotary kiln as claimed in claim 5, wherein: the heating body is electrically connected with the anode and the cathode, replaces part of the insulating material on the inner wall of the kiln chamber, and is fixed by the insulating material adjacent to the heating body in the circumferential direction of the rotary pipe and the insulating material between the heating body and the inner wall of the rotary pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821750667 | 2018-10-27 | ||
| CN2018217506673 | 2018-10-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210718603U true CN210718603U (en) | 2020-06-09 |
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ID=70937472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921745742.1U Active CN210718603U (en) | 2018-10-27 | 2019-10-17 | Electric heating rotary kiln |
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| Country | Link |
|---|---|
| CN (1) | CN210718603U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113648986A (en) * | 2021-08-13 | 2021-11-16 | 成都中科普瑞净化设备有限公司 | Preparation method of catalyst for preparing vinyl chloride by hydrochlorinating acetylene |
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2019
- 2019-10-17 CN CN201921745742.1U patent/CN210718603U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113648986A (en) * | 2021-08-13 | 2021-11-16 | 成都中科普瑞净化设备有限公司 | Preparation method of catalyst for preparing vinyl chloride by hydrochlorinating acetylene |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240509 Address after: No. 104, 1st Floor, Building 2, No. 1999 Tianfu Fourth Street, Chengdu High tech Zone, Chengdu Free Trade Zone, Sichuan Province, 610000 Patentee after: China Hydrogen Metallurgical Control (Chengdu) Technology Co.,Ltd. Country or region after: China Address before: 610041 Chengdu Institute of organic chemistry, Chinese Academy of Sciences, No. two, 16 south section of the first ring road, Chengdu, Sichuan Patentee before: Feng Liangrong Country or region before: China |
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| TR01 | Transfer of patent right |