CN210512579U - Rotary kiln with spiral sandwich structure - Google Patents
Rotary kiln with spiral sandwich structure Download PDFInfo
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- CN210512579U CN210512579U CN201920878537.6U CN201920878537U CN210512579U CN 210512579 U CN210512579 U CN 210512579U CN 201920878537 U CN201920878537 U CN 201920878537U CN 210512579 U CN210512579 U CN 210512579U
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Abstract
A rotary kiln with a spiral sandwich structure is characterized in that a cylinder body of the rotary kiln is formed by butt joint and sealing of the inner diameters of a spiral sandwich cylinder body and an end socket cylinder body; the spiral interlayer cylinder body is composed of a kiln shell, a fireproof heat-insulating material and a spiral interlayer from outside to inside, the spiral interlayer is built by fireproof special-shaped hollow bricks, and a cavity in the interlayer is a spiral material channel. When the material rotates along with the kiln body, the material moves from the lower end to the higher end of the rotary kiln in the hollow channel of the spiral interlayer, falls into the inner cylinder of the kiln after reaching the higher end of the rotary kiln, continues to perform rotary motion, and is finally discharged from the second material passing port at the bottom end; the end socket cylinder body and the spiral interlayer cylinder body take a sealing structure as a boundary, and the end socket cylinder body is composed of refractory bricks and a kiln shell; the utility model discloses increased the diameter of rotary kiln, shortened the kiln length of rotary kiln, made the cross section temperature gradient increase of rotary kiln, the interbedded high temperature of spiral preheats the material, has reduced the temperature of rotary kiln barrel simultaneously, has improved the life-span of rotary kiln.
Description
Technical Field
The utility model relates to a rotary kiln tubular structure, especially a take interbedded rotary kiln of spiral that comprises spiral intermediate layer tubular structure and head tubular structure.
Background
The rotary kiln is commonly called as a rotary kiln, the application of the rotary kiln originates from cement production, and an earth vertical kiln which is operated intermittently is invented by easypu in 1824 years; in 1883 German Diz invented a continuously operating multi-layer shaft kiln; 1885 England Samu invented rotary kiln, after having patented English and American, it is put into production, and quickly obtain considerable economic benefit. The invention of the rotary kiln, make the cement industry develop rapidly, promoted the study of people to the application of the rotary kiln at the same time, the rotary kiln is applied to many industrial fields rapidly and extensively, and more important in these productions, become the core equipment produced in the corresponding enterprises; in the building material industry, the rotary kiln is used for calcining clay and limestone, drying slag and the like besides calcining cement clinker; in the production of the refractory material, the raw material is calcined by a rotary kiln, so that the size of the refractory material is stable, the strength of the refractory material is increased, and the refractory material is processed and molded; in the ore dressing process, the lean iron ore is magnetized and roasted by a rotary kiln, so that the original weak magnetism of the ore is changed into strong magnetism, and the magnetic separation is facilitated; in the chemical industry, soda is produced by a rotary kiln, phosphate fertilizer, barium sulfide and the like are calcined, in the last 60 th century, the American Lapple and the like invent a novel process for producing phosphoric acid by the rotary kiln, and the method has the advantages of low energy consumption, less electricity consumption, no use of sulfuric acid and utilization of medium and low grade phosphate ores; in the aspect of environmental protection, the developed countries in the world utilize cement kilns to burn dangerous wastes and garbage for more than 20 history years, so that the wastes are reduced and harmless, and the wastes are utilized as fuel, thereby saving coal powder and recycling the wastes. The whole production process of cement is summarized as 'two-grinding and one-burning', wherein 'one-burning' is a process of burning raw materials prepared by grinding into clinker under the high-temperature action of a rotary kiln, so that the rotary kiln is key equipment in cement production and is commonly called as 'heart' of a cement factory; in the working process, the temperature of high-temperature flue gas in the rotary kiln can reach 1700 ℃, the traditional rotary kiln is a rotary body which continuously rotates and is continuously in a high-temperature heating state in the production and operation process, the traditional rotary kiln is a cylinder which is obliquely arranged, materials are added from the high end of the kiln, the materials in the kiln axially move while turning over circumferentially along with the rotation of the rotary kiln, the materials exchange heat with the high-temperature flue gas in the moving process and are discharged from the low end after being changed into qualified products through physical and chemical changes, the rotation of the rotary kiln is driven by a driving system outside the kiln, the cylinder body of the rotary kiln is generally made of a steel plate, and a refractory material is lined in the cylinder body; the heat consumption of the prior rotary kiln is higher because the heat dissipation loss of the surface of the cylinder is larger; take novel dry process cement rotary kiln system as an example, according to incomplete statistics, average heat loss is 3500kJ/kg grog, and the heat dissipation loss on kiln body surface has reached 960kJ/kg grog, accounts for 27% of total heat loss, and the same problem also exists in the application of other rotary kilns, and generally speaking, there is the higher problem of energy consumption in present rotary kiln, for make full use of kiln body surface waste heat, the utility model discloses a rotary kiln with spiral intermediate layer.
The CN 207407672U utility model improves the preheating zone on the basis of the traditional rotary kiln, and the materials are uniformly advanced by a screw propulsion method, so that the energy-saving effect is not achieved; CN 201653120U utility model patent, preheating zone use spiral channel to impel the material, and the hot gas gets into from the burning zone and preheats the mode heating material that takes the inner tube to pass through the heat conduction, preheats and takes the plus insulation material to keep warm, and the unable effective utilization burns the heat that the zone rotary kiln outer wall scatters and disappears, and the material all is single-pass flow among the prior art, moves the other end from one end promptly, the utility model discloses material motion adopts the double-pass to flow, from the low side to high-end low side again.
Disclosure of Invention
In order to solve the deficiency of the prior art, the utility model provides a compact structure, consumption reduction energy-conservation, high rotary kiln of taking spiral sandwich structure of work efficiency changes the material into the double-pass action by the one-way operation, realizes shortening the kiln length, make full use of heat energy, reduce the purpose of energy consumption.
The utility model adopts the following technical proposal to realize the purpose.
A rotary kiln with a spiral sandwich structure comprises a feeding device, a sealing structure, a first material passing port, a spiral sandwich layer, a supporting device, a power device, a kiln shell, a second material passing port, a kiln inner cylinder, a combustion device and a kiln hood; the method is characterized in that: the cylinder body of the rotary kiln is formed by butt joint of the inner diameters of a spiral interlayer cylinder body and an end socket cylinder body and sealing by a sealing structure;
the spiral interlayer cylinder body is composed of a kiln shell, a fireproof heat-insulating material layer and a spiral interlayer from outside to inside, wherein the kiln shell is a steel plate; the thickness of the refractory heat-insulating material layer is 0mm-200 mm; the thickness of the spiral interlayer is 100mm-500mm, the spiral interlayer is built by refractory special-shaped hollow bricks, and a cavity in the interlayer is a spiral material channel; the feeding device is communicated with the sealing structure, the first material passing hole is the starting end of a material channel of the spiral interlayer, the first material passing hole is in contact with the sealing structure, the sealing structure is static, when the first material passing hole of the spiral interlayer rotates to the opening of the sealing structure, the material passes through the sealing structure from the feeding device and then enters the spiral interlayer through the material passing hole, the spiral interlayer rotates together with the barrel, the material rolls over under the action of gravity and friction force in the rotating process and advances from one end of the spiral interlayer to the other end, the second material passing hole is arranged on the last circle of spiral interlayer to enable the spiral interlayer to be communicated with the kiln inner barrel, and the raw material can enter the kiln inner barrel to do rotary motion; the first material passing port is arranged at the lower end of the rotary kiln, and when the rotary kiln rotates along with the kiln body, the materials move from the lower end to the higher end of the rotary kiln in the material channel in the spiral interlayer, fall into the inner cylinder of the rotary kiln after reaching the higher end of the rotary kiln, continue to do rotary motion and are finally discharged from the second material passing port at the lower end;
the end socket cylinder and the spiral interlayer cylinder take the sealing structure as a boundary, the end socket cylinder is composed of refractory bricks and a kiln shell, the refractory bricks are 100-500 mm, and the kiln shell is a steel plate;
the combustion device is a combustor and is positioned at the kiln head cover, fuel gas and combustion-supporting air are mixed and combusted to heat materials, and high-temperature flue gas moves from the kiln head to the kiln tail and is discharged to enter the flue gas treatment system.
The further technical scheme is as follows.
The rotary kiln with the spiral sandwich structure has the inclination of 0.5-4.5 degrees.
The rotary kiln with the spiral sandwich structure is characterized in that the diameter of the inner kiln cylinder of the rotary kiln is 1m-4.5 m.
The screw pitch of a hollow spiral channel formed by a spiral interlayer of the rotary kiln is 200-800 mm.
The rotary kiln with the spiral sandwich structure has the length-diameter ratio of L/D = 10-30.
Adopt above-mentioned the utility model provides a technical scheme, compare with prior art, its advantage is as follows with positive effect:
the utility model discloses a double-deck design has shortened the kiln length, makes preheating zone and burning zone coincidence, and the heat that burning zone scatters and disappears directly is used for preheating the material through the barrel inner wall, has practiced thrift a large amount of heats, has saved and has extracted hot-blast being used for preheating from the cooling zone, has saved electric power.
The utility model enlarges the diameter of the rotary kiln cylinder, the hollow spiral interlayer is beneficial to heat preservation, and the materials in the peripheral spiral interlayer absorb heat, so that the temperature gradient is increased, the temperature of the contact surface of the kiln body and the air is reduced, the heat loss is reduced, the energy is saved, the consumption is reduced, and the service life of the rotary kiln is prolonged; because the material absorbs heat, the high temperature layer in the refractory brick becomes thin, which is beneficial to improving the service life of the refractory brick, and the hollow spiral interlayer lightens the structure of the rotary kiln body, which is beneficial to saving energy and improving the service life of the kiln body.
The utility model discloses extra power is not needed in the material operation among the spiral intermediate layer, and at the rotatory in-process of whole barrel, the material can be because spiral intermediate layer design advances to the other end from one end, has saved electric power.
The utility model discloses when the material was marchd in the spiral intermediate layer, its position was in barrel cross section lower part all the time, also was in the lower part when the gyration was marchd in the inner tube, and all toward a lateral tilt, and the calcination material that rolls and scalds is close with the lower preheating material position of temperature, is favorable to heat transfer.
The utility model discloses the material gets into kiln inner tube structure from spiral intermediate layer, directly trompil on the last round used resistant firebrick of spiral intermediate layer, and the material can be because of gravity directly the kiln inner tube that falls, has saved unnecessary operation, convenient and fast.
Drawings
Fig. 1 is a schematic view of the rotary kiln of the present invention.
Fig. 2 is an enlarged schematic view of the kiln head of fig. 1 according to the present invention.
Fig. 3 is an enlarged schematic structural diagram of a region a in fig. 1 and 2 according to the present invention.
Fig. 4 is a schematic view of a-a half-section structure of fig. 1 and 2 according to the present invention.
Fig. 5 is a schematic view of a half-section B-B of fig. 1 and 2 according to the present invention.
Fig. 6 is an enlarged schematic view of the kiln tail of fig. 1 according to the present invention.
Fig. 7 is a schematic view of a C-C half-section structure of fig. 1 and 6 according to the present invention.
Fig. 8 is a schematic diagram of the forward movement of the material in the spiral interlayer of the present invention.
Fig. 9 is a structural example diagram of the brick laid by the spiral interlayer of the present invention.
Fig. 10 is a structural example diagram of the spiral interlayer brickwork of the invention.
In the figure: 1: a feeding device; 2: sealing structure, 3: a first material passing port; 4: a spiral interlayer; 5: a support device; 6: a power plant; 7: a kiln shell; 8: a belt wheel; 9: a second material passing port; 10: an inner kiln cylinder; 11: a kiln head cover.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings.
As shown in the attached drawing 1, the rotary kiln with the spiral sandwich structure comprises a feeding device 1, a sealing structure 2, a first material passing port 3, a spiral sandwich layer 4, a supporting device 5, a power device 6, a kiln shell 7, a second material passing port, a wheel belt 8, a second material passing port 9, a kiln inner cylinder 10, a kiln head cover 11 and a combustion device 12; wherein, the cylinder of the rotary kiln is formed by butt joint of the inner diameters of a spiral interlayer cylinder and an end socket cylinder and sealing by a sealing structure;
the spiral interlayer cylinder body is composed of a kiln shell 7, a fireproof heat-insulating material and a spiral interlayer 4 from outside to inside, wherein the kiln shell 7 is a steel plate, the thickness of the fireproof heat-insulating material is 0mm-200mm, and the thickness of the spiral interlayer 4 is 100mm-500 mm; the spiral interlayer 4 is built by refractory special-shaped hollow bricks, the hollow in the interlayer is a spiral material channel, the first material passing port 3 is positioned at the sealing structure 2 and communicated with the hollow channel of the spiral interlayer 4 and the feeding device 1, the sealing structure 2 is static, when the first material passing port 3 of the spiral interlayer 4 rotates to the opening of the sealing structure 2, the material passes through the opening reserved at the starting end of the hollow channel of the spiral interlayer 4, the spiral interlayer 4 and the cylinder rotate together, the material rolls in the spiral interlayer in a turnover way under the action of gravity and friction in the rotation process and travels from one end of the spiral interlayer 4 to the other end, and the second material passing port 9 is arranged on the last circle of spiral interlayer to communicate the spiral interlayer 4 with the kiln inner cylinder 10, so that the raw material can enter the kiln inner cylinder 10 to do rotary motion and continue to be mixed in a rotary way; the first material passing port 3 is arranged at the lower end of the rotary kiln, and when the rotary kiln rotates along with the kiln body, the material moves from the lower end of the rotary kiln to the higher end of the rotary kiln in the hollow channel of the spiral interlayer 4, falls into the inner cylinder 10 of the rotary kiln after reaching the higher end of the rotary kiln, continues to perform rotary motion, and is finally discharged from the second material passing port 9 at the bottom end;
the end socket cylinder is positioned at the first feed opening 3 of the rotary kiln and consists of refractory bricks and a kiln shell 7, wherein the refractory bricks are 100-500 mm, and the kiln shell 7 is a steel plate.
In the above embodiment, with the rotation of the rotary kiln, when the first material passing port 3 rotates to the outlet position of the feeding device 1, the material enters the spiral interlayer 4 through the material passing port 3, the material is always at the bottom of the cylinder body in the spiral interlayer 4 and continuously moves upwards along the axial direction, in the process, the combustion device 12 supplies heat, the temperature in the kiln inner cylinder 10 is very high, the material in the spiral interlayer 4 is continuously preheated by the heat dissipated from the kiln inner cylinder 10, the material moves to the kiln tail in the spiral interlayer 4 and directly enters the kiln inner cylinder 10 through the second material passing port 9, after entering the kiln inner cylinder 10, the material makes a rotary motion and rolls down, in the process, the material is continuously heated through the countercurrent heat exchange, and then passes through the firing zone to finally form a fired material, in the whole process, the sealing structure 2, the feeding device 1 and the kiln head cover 11 are all static, the spiral interlayer 4 rotates together with the kiln inner cylinder 10, the combustion device 12 is a burner and is positioned at the kiln head cover 11, fuel gas and combustion-supporting air are mixed to burn and heat materials, and high-temperature flue gas moves from the kiln head to the kiln tail and is discharged into a flue gas treatment system.
As shown in figure 8, the material is just at the position A, the position A is lower than the horizontal position of the position B, if the cylinder rotates in the direction shown in the figure, after 1/4 circles, the position A is higher than the position B due to the fact that the whole inclination of the cylinder is small and the difference of the horizontal heights of each circle of spiral is smaller than the radius of the spiral, and at the moment, the material moves from the position A to the position B due to the action of gravity, so that the material moves from the low position to the high position.
The spiral interlayer 4 is built by special-shaped refractory special bricks, the shape of the bricks is as shown in figure 9, but the bricks are not limited to the figure, and the periphery of the kiln body is supported by steel structures.
The end socket cylinder body at one end of the discharge port is made of refractory bricks, the steel plate is made from inside to outside, the size of the refractory bricks is 100mm-500mm, the other cylinder bodies are spiral interlayer cylinders, the cylinder bodies are made from inside to outside and are made of spiral interlayers, fireproof heat-insulating materials and steel plates, the size of each spiral interlayer is 100mm-500mm, the size of each fireproof heat-insulating layer is 0mm-200mm, rigid supports are arranged in the fireproof heat-insulating material layers, and the rigid supports are formed by changing the shapes of parts of the refractory bricks forming the spiral interlayers, as shown in figure 10.
The design that the materials enter the kiln inner cylinder 10 from the hollow spiral channel in the spiral interlayer 4 directly changes the shape of the fireproof hollow brick of the spiral interlayer 4 to form the second material passing hole 9, and the materials can directly fall into the kiln inner cylinder 10 due to gravity.
In the implementation of the above embodiment, the technical parameters of the rotary kiln are as follows:
the inclination of the rotary kiln is 0.5-4.5 degrees;
the diameter of the inner cylinder of the rotary kiln is 1m-4.5 m;
the thickness of the spiral interlayer of the rotary kiln is 100mm-500 mm;
the pitch of the spiral interlayer of the rotary kiln is 300mm-800 mm;
the length-diameter ratio of the rotary kiln is L/D = 10-30.
The present embodiment is not intended to limit the shape, material, structure, etc. of the present invention in any form, and all of the technical matters of the present invention belong to the protection scope of the present invention to any simple modification, equivalent change and modification made by the above embodiments.
Claims (5)
1. A rotary kiln with a spiral sandwich structure comprises a feeding device, a sealing structure, a first material passing port, a spiral sandwich layer, a supporting device, a power device, a kiln shell, a second material passing port, a kiln inner cylinder, a combustion device and a kiln hood; the method is characterized in that: the cylinder body of the rotary kiln is formed by butt joint of the inner diameters of a spiral interlayer cylinder body and an end socket cylinder body and sealing by a sealing structure;
the sealing structure is in contact sealing with the end socket cylinder and in contact sealing with the spiral interlayer cylinder; an opening is reserved in the sealing structure, one side of the opening, which is close to the material channel, is in butt joint sealing with the material channel of the feeding device, and the sealing structure and the feeding device are static;
the spiral interlayer cylinder body is composed of a kiln shell, a fireproof heat-insulating material layer and a spiral interlayer from outside to inside, wherein the kiln shell is a steel plate; the thickness of the refractory heat-insulating material layer is 0mm-200 mm; the thickness of the spiral interlayer is 100mm-500mm, the spiral interlayer is built by refractory special-shaped hollow bricks, and a cavity in the interlayer is a spiral material channel; the feeding device is communicated with the sealing structure, the first material passing hole is the starting end of a material channel of the spiral interlayer, the first material passing hole is in contact with the sealing structure, the sealing structure is static, when the first material passing hole of the spiral interlayer rotates to the opening of the sealing structure, the material passes through the sealing structure from the feeding device and then enters the spiral interlayer through the material passing hole, the spiral interlayer rotates together with the cylinder body, the material overturns and rolls in the spiral interlayer due to the action of gravity and friction force in the rotating process and is conveyed to the other end from one end of the spiral interlayer, the second material passing hole is formed in the last circle of spiral interlayer so that the spiral interlayer is communicated with the kiln inner cylinder, and the material can enter the kiln inner cylinder to do; the first material passing port is arranged at the lower end of the rotary kiln, and when the rotary kiln rotates along with the kiln body, the materials move from the lower end to the higher end of the rotary kiln in the material channel in the spiral interlayer, fall into the inner cylinder of the rotary kiln after reaching the higher end of the rotary kiln, continue to do rotary motion and are finally discharged from the second material passing port at the lower end;
the end socket cylinder and the spiral interlayer cylinder take the sealing structure as a boundary, the end socket cylinder is composed of refractory bricks and a kiln shell, the refractory bricks are 100-500 mm, and the kiln shell is a steel plate;
the combustion device is a combustor and is positioned at the kiln head cover, fuel gas and combustion-supporting air are mixed and combusted to heat materials, and high-temperature flue gas moves from the kiln head to the kiln tail and is discharged to enter the flue gas treatment system.
2. The rotary kiln with a spiral sandwich structure as set forth in claim 1, wherein: the inclination of the rotary kiln is 0.5-4.5 deg.
3. The rotary kiln with a spiral sandwich structure as set forth in claim 1, wherein: the diameter of the kiln inner cylinder of the rotary kiln is 1m-4.5 m.
4. The rotary kiln with a spiral sandwich structure as set forth in claim 1, wherein: the screw pitch of the spiral interlayer of the rotary kiln is 200mm-800 mm.
5. The rotary kiln with a spiral sandwich structure as set forth in claim 1, wherein: the length-diameter ratio of the rotary kiln is L/D = 10-30.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920878537.6U CN210512579U (en) | 2019-06-12 | 2019-06-12 | Rotary kiln with spiral sandwich structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920878537.6U CN210512579U (en) | 2019-06-12 | 2019-06-12 | Rotary kiln with spiral sandwich structure |
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| CN210512579U true CN210512579U (en) | 2020-05-12 |
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| CN201920878537.6U Expired - Fee Related CN210512579U (en) | 2019-06-12 | 2019-06-12 | Rotary kiln with spiral sandwich structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173978A (en) * | 2019-06-12 | 2019-08-27 | 太原理工大学 | A kind of rotary kiln with spiral sandwich |
| CN110173978B (en) * | 2019-06-12 | 2024-06-25 | 太原理工大学 | Rotary kiln with spiral sandwich structure |
-
2019
- 2019-06-12 CN CN201920878537.6U patent/CN210512579U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173978A (en) * | 2019-06-12 | 2019-08-27 | 太原理工大学 | A kind of rotary kiln with spiral sandwich |
| CN110173978B (en) * | 2019-06-12 | 2024-06-25 | 太原理工大学 | Rotary kiln with spiral sandwich structure |
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Granted publication date: 20200512 Termination date: 20210612 |
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