CN109269294B - External heating rotary furnace with closed feeding and discharging at same side - Google Patents
External heating rotary furnace with closed feeding and discharging at same side Download PDFInfo
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- CN109269294B CN109269294B CN201811115985.7A CN201811115985A CN109269294B CN 109269294 B CN109269294 B CN 109269294B CN 201811115985 A CN201811115985 A CN 201811115985A CN 109269294 B CN109269294 B CN 109269294B
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/08—Rotary-drum furnaces, i.e. horizontal or slightly inclined externally heated
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/10—Rotary-drum furnaces, i.e. horizontal or slightly inclined internally heated, e.g. by means of passages in the wall
-
- 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
- F27B7/14—Rotary-drum furnaces, i.e. horizontal or slightly inclined with means for agitating or moving the charge
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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
- 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
- F27B7/24—Seals between rotary and stationary parts
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/26—Drives
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/33—Arrangement of devices for discharging
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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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
-
- 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
- F27B7/26—Drives
- F27B2007/261—Drives working with a ring embracing the drum
-
- 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
- F27B7/32—Arrangement of devices for charging
- F27B7/3205—Charging
- F27B2007/3247—Charging through a lateral opening in the drum
Abstract
The invention discloses an external heating rotary furnace with closed feeding and discharging sides, which comprises a furnace body and three sections of jackets arranged on the outer wall of the furnace body, wherein a riding wheel device for supporting the furnace body is arranged between the jackets; the inner cavity of the furnace body is provided with a tube bundle distributed along the axial direction of the furnace body, a tube array air inlet jacket and a tube array air outlet jacket in the three-section jacket form an independent heat carrier gas channel in the furnace body with the tube bundle, and the middle jacket and the outer wall of the furnace body form an independent heat carrier gas channel outside the furnace body; each section of jacket is sealed and sealed by a flexible jacket; the front part of the furnace body is provided with an air outlet device and a power mechanism for linking the rotation of the furnace body, the tail part of the furnace body is provided with a material inlet and outlet device which are arranged on the same side, and the furnace bodies of the air outlet device and the material inlet and outlet device are provided with sealing structures; the heat-carrying gas channel formed by the tube bundle inside the furnace body and the outer jacket can heat the material in the furnace body indirectly at the same time, so that the material can be heated efficiently. The equipment reduces environmental pollution, reduces energy consumption, improves heat exchange efficiency, and ensures equipment operation safety.
Description
Technical Field
The invention relates to an external heating type rotary furnace, in particular to a rotary furnace which is airtight, has the same feeding and discharging sides and is used for indirectly heating furnace walls and pipe walls.
Background
In the industries of chemical industry, metallurgy, building materials and the like, various powder and particle raw materials are often required to be heated, the purposes of calcining, dry distilling, drying and the like of the raw materials are achieved, and the rotary furnace is equipment with high processing capacity, reliable operation and high adaptability, plays an important role in continuous production, and is widely used in the industries.
At present, rotary furnaces in China mainly comprise three types of internal heating type, external heating type and compound heat transfer type.
The internal heat type rotary furnace has the advantages that the internal heat type rotary furnace directly contacts with the dried materials, the materials are subjected to heat exchange by means of convection heat transfer, the heat utilization rate is high, the material reaction time is short, but the materials are easy to be polluted by the heat carrying gas, and when the feeding amount is large, the specification and the manufacturing difficulty of the heat carrying gas treatment capacity equipment are increased, so that the equipment treatment capacity is not excessively large.
The external heating rotary furnace adopts indirect heat transfer, the heat carrier is not directly contacted with the dried material, the heat exchange is carried out on the outer wall of the furnace body through the hot air jacket, the heat conduction and the heat transfer are carried out on the material by the outer wall of the furnace body, the external heating rotary furnace has the advantages of low cost, simple and stable operation, but the heat transfer coefficient is lower, and when the gas quantity generated by the reaction is larger, the required specification and the size of the rotary furnace are larger due to the arrangement problem of the feeding and discharging devices and the gas outlet devices.
The duplex heat transfer adopts the combination of heat conduction and convection heat transfer, has higher heat transfer efficiency and reduces heat loss, but is not suitable for materials which are difficult to treat after the pollution of the hot gas.
Disclosure of Invention
The invention provides a closed external heating rotary furnace aiming at the problems existing in the prior art. The equipment is a completely closed rotary furnace which indirectly heats raw materials on the furnace wall and the pipe wall, the heat exchange area is 3-5 times higher than that of a common external heating rotary furnace, the raw materials are heated uniformly, and the heat exchange efficiency is greatly improved; the material inlet and outlet are arranged at the tail of the furnace, and the air outlet pipeline is arranged at the furnace end, so that the air outlet can be provided with a large space, and the design of a sealing surface is facilitated; the sealing device of the furnace end and the furnace tail can effectively isolate air, prevent internal gas and dust from overflowing to pollute the environment, prevent external harmful substances from entering the polluted raw materials, and adapt to the production of materials in a special reaction environment; a material conveying device is arranged in the furnace body, so that materials are preheated in the material conveying device, and favorable conditions are provided for subsequent reactions; the device can continuously and stably run for a long time, and the blanking is continuous and uniform.
The invention is realized by the following technical scheme.
An external heating rotary furnace with closed feeding and discharging sides comprises a furnace body, wherein a tube air inlet jacket, a tube air outlet jacket and a middle jacket are arranged on the outer wall of the furnace body, and a riding wheel device for supporting the furnace body is arranged between the three jackets; a tube bundle distributed along the axial direction of the furnace body is arranged in the inner cavity of the furnace body, a tube array air inlet jacket and a tube array air outlet jacket in the three-section jacket form an independent heat carrier gas channel in the furnace body with the tube bundle, and the middle jacket and the outer wall of the furnace body form an independent heat carrier gas channel outside the furnace body; each section of jacket is sealed and sealed by a flexible jacket; the front part of the furnace body is provided with an air outlet device and a power mechanism for linking the rotation of the furnace body, the tail part of the furnace body is provided with a charging and discharging device which is arranged on the same side, and the furnace body corresponding to the air outlet device and the charging and discharging device is provided with a sealing structure; the heat-carrying gas channel formed by the tube bundle inside the furnace body and the outer jacket can indirectly heat the materials in the furnace body.
For the above technical solution, the present invention is further preferred:
further, the furnace body is erected on the riding wheel blocking device and the riding wheel device through the rolling rings I and the rolling rings II which are arranged on the furnace body to realize supporting.
Further, the large gear ring is fixedly arranged at the head part of the furnace body, and the large gear ring is meshed and driven by a pinion connected with the transmission device to drive the furnace body to continuously run on the supporting roller device and the supporting roller device on the supporting device.
Further, the feeding and discharging device arranged on the same side comprises a feeding device and a discharging device;
the feeding device comprises a feeding conveyor extending into the furnace body, a conveying device is arranged in the feeding conveyor, and a slow-falling discharge hole is formed in the inner end part of the feeding conveyor; the discharging part is arranged between the discharging box and the furnace body in a sealing way;
the discharging device comprises a discharging box and an explosion venting device arranged on the discharging box, a discharging cone and a discharging tube section connected with the discharging cone are arranged at the discharging end of the furnace body, and reducing spirals are arranged in the discharging cone and the discharging tube section.
Further, the reducing screw is a multi-head reducing screw.
Further, the feeding device comprises an internal screw of a screw blade structure; the whole furnace body is obliquely installed, materials enter from the furnace body installation low-point end, are directly fed into the conveying device through the feeding conveyor, and are conveyed to the furnace body installation high-point end by the conveying device along with the rotation of the furnace body, and fall into the furnace body from the slow-falling discharge port.
Further, the middle jacket is provided with two air inlets and one air outlet; the tube-array air outlet jacket and the tube-array air inlet jacket are respectively provided with an air outlet and an air inlet, and each air inlet and each air outlet are provided with a thermometer interface connected to the central control system; the tube bundles axially distributed in the furnace body respectively correspond to an air outlet of the tube array air outlet jacket and an air inlet of the tube array air inlet jacket, and an air chamber air outlet is distributed at the head of the furnace body; the tube bundles are circumferentially arranged in the furnace body by taking the central shaft of the furnace body as a reference, and can be arranged into single circle or multiple circles.
Further, the tube bundles are uniformly distributed along the axial center line inside the furnace body, one ends of a plurality of tube bundles are fixed on the inner wall of the furnace body, the other ends of the tube bundles are movably connected on a tube plate inside the furnace body, and a compensation device is arranged between the tube bundles and the tube plate; the tube bundles are supported by a plurality of rows of tube racks in the furnace body.
Further, a sealing structure between the furnace body and the feeding and discharging device adopts a combined structure of mechanical seal and floating ring seal; the mechanical seal is in a double sealing surface structure of a movable ring and a static ring; an oil groove is formed in the sealing surface of the stationary ring, a plurality of cylinders for pressing the stationary ring are arranged on the stationary ring support frame, and the stationary ring support frame is connected with the feeding sealing pipe frame through a compensator.
Further, the flexible jacket seal comprises a sealing backing plate arranged in the jacket, a cone flange and a wear-resistant sealing block are respectively arranged on the sealing backing plate, one end of the flexible plate is connected with the cone flange, the other end of the flexible plate is connected with the wear-resistant sealing block, the upper surface and the lower surface of the flexible plate are respectively provided with a heat-resistant plate and an elastic steel plate, and the lower part of the elastic steel plate is connected with a balancing weight through a steel wire rope; and a wind shield is arranged on the flexible plate.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention comprehensively considers the dynamic and static sealing structures required by the sealing of the material inlet and outlet device, the sealing of the air outlet device, the sealing of the jacket and the like of the heating rotary furnace, adopts double sealing of combination of mechanical sealing and floating ring sealing on the furnace end and the furnace tail of the equipment, so that the whole equipment has good sealing property, and the closed reaction space separates materials from raw materials and products, thereby providing a good closed atmosphere environment for material reaction; the raw materials and the products are not polluted by the outside, the environmental pollution is reduced, the energy consumption is reduced, the heat exchange efficiency is improved, and the operation safety of the equipment is ensured.
2. The heating mode is indirect heating of furnace walls and pipe walls of the furnace body, and meanwhile, the heat-carrying gas is recycled, so that the heat exchange area is greatly increased, the heat efficiency is improved, the raw materials are heated more fully, the energy consumption of unit products is greatly reduced, and the purpose of energy conservation is achieved. The jacket adopts an internal heat insulation structure, and is simple and convenient to install and maintain.
3. The double sealing of the combination of the mechanical seal and the floating ring seal is adopted for sealing both ends of all jackets, and the closed reaction space separates materials from raw materials and products, so that the raw materials and the products are not polluted by the outside, the environmental pollution is reduced, and the running safety of equipment is ensured. The device has good sealing performance, and reduces energy consumption and environmental pollution.
4. The furnace body is internally provided with a plurality of rows of tube bundles, and the compensation device solves the problems of thermal expansion of the pipeline and sealing of the distribution air chamber and the cylinder body, thereby improving the heat exchange area, reducing the equipment specification and saving the investment cost.
5. The reaction materials are fed and discharged on the same side, so that the space is saved, and the design of an air outlet and the design of a furnace end and a furnace tail seal are facilitated.
6. The furnace body is internally provided with a material conveying device with a preheating function, so that the reaction is quicker, and the dust raising height of conveyed materials is reduced. The design of the air outlet is also convenient, the equipment specification is effectively reduced, the productivity is improved, and the investment cost is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate and do not limit the invention, and together with the description serve to explain the principle of the invention:
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a jacket hot air inlet and outlet;
FIG. 3 is a schematic view of a feed seal configuration;
FIG. 4 is a schematic view of a jacket seal structure;
FIG. 5 is a schematic cross-sectional view of a tubular air intake jacket cylinder.
In the figure: 1. an air outlet; 2. a transmission device; 3. a pinion gear; 4. a large gear ring; 5. a tube-array air outlet jacket; 6. a rolling ring I; 7. a furnace body; 8. an intermediate jacket; 9. a rolling ring II; 10. a tube-array air inlet jacket; 11. a feeding and discharging device; 12. a riding wheel device; 13. a supporting roller device; 14. sealing the jacket; 15. sealing the air outlet; 16. a gas outlet trolley; 17. an air outlet device; 18. a spiral ash removing device; 19. explosion venting device; 20. a feed conveyor; 21. discharging and sealing; 22. a discharging box; 23. an air inlet of the tube-array air inlet jacket; 24. an air inlet; 25. a tube bundle; 26. a pipe rack; 27. an air outlet; 28. an air outlet of the air outlet jacket of the tube array; 29. a compensation device; 30. an air outlet of the air chamber; 31. a discharging cone; 32. a reducing screw; 33. a discharging cylinder section; 34. a material conveying device; 35. a cylinder; 36. a stationary ring support frame; 37. a stationary ring; 38. a moving ring; 39. a movable ring support frame; 40. a floating ring device; 41. a floating ring adjusting device; 42. a lubrication oil port; 43. a compensator; 44. a wear-resistant sealing block; 45. a sealing backing plate; 46. a heat resistant plate; 47. a wind deflector; 48. a flexible board; 49. an elastic steel plate; 50. a cone flange; 51. a wire rope; 52. balancing weight; 53. an internal screw; 54. slowly falling down to the discharge port.
Detailed Description
The present invention will now be described in detail with reference to the drawings and the specific embodiments thereof, wherein the exemplary embodiments and descriptions of the present invention are provided for illustration of the invention and are not intended to be limiting.
As shown in figure 1, the external heating rotary furnace with the same side of the closed feeding and discharging comprises a furnace body 7 formed by indirect heating of a closed furnace wall and a pipe wall, wherein three sections of jackets are arranged on the outer wall of the furnace body 7, and a riding wheel device 12 for supporting the furnace body 7 is arranged between the three sections of jackets; a tube bundle 25 axially distributed along the furnace body is arranged in the inner cavity of the furnace body 7, a tube array air inlet jacket and a tube array air outlet jacket in the three-section jacket and the tube bundle 25 form an independent heat carrier gas channel in the furnace body, and the middle jacket and the outer wall of the furnace body 7 form an independent heat carrier gas channel outside the furnace body; each section of jacket is sealed by a flexible jacket seal 14; the front end of the furnace body 7 is provided with an air outlet device 17 and a power mechanism for linking the rotation of the furnace body 7, the tail of the furnace body 7 is provided with a material inlet and outlet device 11 which is arranged on the same side, and the furnace body 7 corresponding to the air outlet device 17 and the material inlet and outlet device 11 is provided with a sealing structure; the heat-carrying gas channel formed by the tube bundle inside the furnace body and the outer jacket can heat the material in the furnace body indirectly at the same time, so that the material can be heated efficiently.
The furnace body 7 is erected on the riding wheel blocking device 13 and the riding wheel device 12 through a rolling ring I6 and a rolling ring II 9 which are arranged on the furnace body to realize supporting; the number of rolling rings can be increased according to the length of the furnace body 7 and the allowable bending stress. In order to furthest increase the heating area of the furnace body, a large gear ring 4 is fixedly arranged at the head of the furnace body, and the large gear ring 4 is meshed and driven by a pinion 3 connected with a transmission device 2 to drive the furnace body 7 to continuously run on a supporting device supporting roller blocking device 13 and a supporting roller device 12; the main motor in the transmission device 2 adopts a variable frequency speed regulating motor, can meet the requirements on the rotating speed of the furnace body 7 under different working conditions, and the rotating speed of the rotary furnace body is adjustable.
The front end of the furnace body 7 is provided with an air outlet device 17, on which an air outlet seal 15, an air outlet trolley 16, an air outlet 1, a spiral ash removing device 18 and the like are arranged for removing dust deposited in the air duct. The rear end of the furnace body 7 is provided with a feeding and discharging device 11, an explosion venting device 19, a feeding conveyor 20, a discharging seal 21, a discharging box 22 and the like, and a temperature measuring device, a pressure measuring device, an emergency discharging port and the like can be additionally arranged according to requirements; the feeding and discharging device 11 is supported by a bracket.
The feeding and discharging device 11 arranged on the same side comprises a feeding device and a discharging device; the feeding device comprises a feeding conveyor 20 extending into the furnace body, a conveying device 34 is arranged in the feeding conveyor 20, and a slow-falling discharge port 54 is arranged at the inner end part of the feeding conveyor 20; the discharging seal 21 is arranged between the discharging box 22 and the furnace body 7. The discharging device comprises a discharging box 22 and an explosion venting device 19 arranged on the discharging box 22, a discharging cone 31 extending into the furnace body 7 and a discharging cylinder section 33 connected with the discharging cone 31 are arranged in the discharging box 22, and a reducing screw 32 is arranged in the discharging cone 31 and the discharging cylinder section 33 and is a multi-head reducing screw.
Outside the furnace body 7, a jacket seal 14 is provided for sealing the heat carrier gas by a heat carrier gas jacket. The jacket is divided into three sections, namely a tube array air inlet jacket 10, a middle jacket 8 and a tube array air outlet jacket 5, wherein the tube array air outlet jacket 5 is positioned between the large gear ring 4 and the rolling ring I6, the middle jacket 8 is positioned between the two rolling rings, the tube array air inlet jacket 10 is positioned between the rolling ring II 9 and the feeding and discharging device 11, and the jackets of the sections are sealed by flexible jacket seals 14. For measuring the temperature of the heat-carrying gas, a thermometer interface is arranged at each air inlet and air outlet, so that the temperature of the heat-carrying gas can be timely fed back to a central control system, the supply of the heat-carrying gas can be timely adjusted according to the process requirements, and the high-efficiency and full reaction of materials can be ensured; the jacket adopts a multi-layer internal heat preservation structure. The heating heat-carrying gas channel adopts a combination of a jacket and a tube bundle, and indirectly heats materials inside and outside the furnace body.
A combined seal of mechanical seal and floating ring seal is arranged between the furnace body 7; the outside of the furnace body 7 is provided with a closed heat-carrying gas channel consisting of a cylinder wall, an intermediate jacket 8 and a jacket seal 14, and the outside is provided with a closed tube bundle hot air heat-carrying gas channel consisting of a tube row air outlet jacket 5, a tube row air inlet jacket 10 and a jacket seal 14.
The furnace body 7 is manufactured by different materials in sections according to the process requirements of material reaction, if the material reaction requirement temperature is higher, the high Wen Duanxuan is manufactured by a special material with high temperature resistance, and can bear high-temperature heating of 850 ℃ at most; the furnace body is made of different materials and different thicknesses according to the heating temperature and the bending stress; the furnace body 7 adopts a design with unequal thickness. The discharge end of the furnace body 7 is provided with a discharge cone 31, a reducing screw 32, a discharge cylinder section 33 and the like, the discharge cone 31 extends into the furnace body 7, the discharge cylinder section 33 at the other end extends into the feeding and discharging device 11, the reducing screw 32 is a multi-head reducing screw, so that the reacted materials are uniformly and continuously led out of the furnace body 7, and are discharged from a discharge hole of the discharge box 22 to enter the next working procedure.
As shown in fig. 1, the sealed inner and outer indirect heating rotary kiln is provided with a jacket for heat carrier gas and a jacket seal 14 for sealing the heat carrier gas outside the kiln body 7. The jacket is divided into three sections, namely a shell air inlet jacket 10, a middle jacket 8 and a shell air outlet jacket 5, wherein the shell air inlet jacket 10 is positioned between the large gear ring 4 and the rolling ring I6, the middle jacket 8 is positioned between the two rolling rings, the shell air outlet jacket 5 is positioned between the rolling ring II 9 and the feeding and discharging device 11, and all the jacket sections are sealed by flexible jacket seals 14. For measuring the temperature of the heat-carrying gas, a thermometer interface is arranged at each air inlet and air outlet, so that the temperature of the heat-carrying gas can be timely fed back to a central control system, the supply of the heat-carrying gas can be timely adjusted according to the process requirements, and the high-efficiency and full reaction of materials can be ensured; the jacket adopts a multi-layer internal heat preservation structure.
As shown in fig. 2, the heat-carrying gas in the intermediate jacket 8 enters the heat-carrying gas channel between the furnace body 7 and the intermediate jacket 8 through the air inlet 24, and is then discharged through the air outlet 27; the heat-carrying gas in the tube bundle 25 enters from the air inlet 23 of the tube-array air-inlet jacket, passes through the tube bundle, and then is collected to the head of the furnace body 7, and then enters into the tube-array air-outlet jacket 5 through the air outlet 30 of the air chamber distributed at the head of the furnace body 7, and is discharged from the air outlet 28 of the tube-array air-outlet jacket. The tube bundles 25 are circumferentially arranged in the furnace body based on the central axis of the furnace body, and the tube bundles can be arranged in single or multiple circles. One or more air inlets and one or more air outlets can be formed in the inner heat-preserving jacket according to process requirements, so that the heat required by each reaction section is ensured to be continuously and uniformly, the supplied materials can be heated and warmed uniformly in the furnace body, and the material reaction with higher requirements on reaction temperature is met.
The tube bundle material is a high temperature resistant material; one end of the tube bundle 25 is fixed on the furnace body 7, the other end is movably connected on a tube plate in the furnace body 7, a compensation device 29 is arranged between the tube bundle 25 and the tube plate, and the compensation device 29 is used for eliminating thermal expansion and cold contraction of the tube bundle 28 and solving the problems of thermal expansion of a pipeline and sealing of a distribution air chamber and a cylinder body; the tube bundles 25 are supported in the furnace body 7 by a plurality of rows of tube racks 26, so that the tube bundles 25 are ensured not to bend or break. And the heat carrier gas is discharged from each air outlet, and then part of the heat carrier gas enters the thermal circulation system again, and the other part of the heat carrier gas is exhausted after preheating air required by fuel combustion. Each section of jacket can be provided with a plurality of heat-carrying gas inlets and a plurality of heat-carrying gas outlets according to the process requirements, so that the heating temperature and the air quantity can be conveniently controlled.
The whole furnace body 7 is obliquely installed, materials enter from the installation low-point end of the furnace body 7, the materials are directly fed into the material conveying device 34 through the material feeding conveyor 20, the materials are conveyed to the installation high-point end of the furnace body 7 along with the rotation of the furnace body 7 by the material conveying device 34, fall into the furnace body 7 from the slowly-falling material outlet 54, the materials exchange heat with the inside of the cylinder body in the conveying process, meanwhile, the heat exchange of the air outlet temperature of the air outlet is reduced, the preheating process is completed, the materials advance to the installation low end along the wall of the furnace body due to the rotation and the installation inclination angle of the furnace body 7, the furnace wall, the pipe wall and the materials are indirectly heated in the advancing process, the reaction process is started, the gas generated by the reaction is led out from the air outlet 1 of the air outlet device 17 to enter the external process, the reacted solid materials are conveyed into the discharge box 22 through the discharge end provided with the discharge cone 31, the diameter-changing screw 32 and the discharge cone 33 to enter the next process.
As shown in figure 3, the seal between the jacket and the furnace body adopts flexible double seal, so that the leakage of heat-carrying gas in the jacket can be effectively prevented, and the heat loss in the circulation process is reduced. The sealing of the air outlet device 17 and the feeding and discharging device 11 adopts a mechanical sealing and floating ring sealing combined structure. The mechanical seal is of a double sealing surface structure, a movable ring support 39 is arranged at the head of the furnace body 7 in the seal, a movable ring 38 is connected to the movable ring support 39, and a stationary ring 37 is connected to the stationary ring support 36; the stationary ring 37 and the moving ring 38 are double sealing surfaces, the two sides of the stationary ring 37 are provided with lubricating oil ports 42, and the sealing surfaces are provided with oil grooves so as to ensure that lubricating grease supplied by a lubricating system ensures good lubrication between the two sealing surfaces of the stationary ring 37 and the moving ring 38, thereby ensuring the safety and reliability of sealing; the static ring support 36 is provided with a plurality of air cylinders 35 for pressing the static ring, and when the equipment operates, the pressure of the air cylinders 35 is adjusted to ensure that the static ring 37 and the movable ring 38 are always kept in close contact with each other so as to realize the sealing of the interior of the furnace body 7; the static ring support 36 is connected with the pipe frame of the air outlet seal 15 by a compensator 43, so as to compensate the expansion and contraction of the equipment.
As shown in fig. 1 and 3, the air outlet seal 15, the air outlet device 17 and the spiral ash removing device 18 are arranged on the air outlet trolley 16, so that the installation and the maintenance are convenient; the gas outlet device 17 is arranged on a pipe frame of the gas outlet seal 15 and is used for guiding out gas generated by the reaction; a spiral ash removal device 18 is arranged in the air outlet device 17 and is used for removing dust deposited in the air outlet device 17, so that smoothness of the air outlet device 17 is ensured; the heat preservation is installed in the short section on the pipe frame of the air outlet seal 15 to reduce the temperature of the stationary ring 37 and the movable ring 38. A floating ring device 40 is arranged between the moving ring support 39 and the furnace body 7, and is used for preventing dust from entering a sealing surface between the moving ring 38 and the static ring 37 and a compensator 43 to influence sealing performance. The floating ring adjusting device 41 is used for controlling and adjusting the position of the floating ring device 40, so as to prevent the floating ring device 40 from being worn out too fast.
As shown in fig. 4, the jacket seal 14 adopts flexible double seal, a flexible plate 48 is arranged between a heat-resistant plate 46 and an elastic steel plate 49, the flexible plate 48 is protected from being damaged by the internal and external environments, one end of the flexible plate 48 is connected with a cone flange 50, the other end of the flexible plate is connected with a wear-resistant seal block 44, and the wear-resistant seal block 44 is tightly attached to a seal backing plate 45 through elastic deformation of the elastic steel plate 49 and a balancing weight 52 added on a steel wire rope 51 wound outside the elastic steel plate, so as to seal the heat-carrying gas in the jacket. The wind shield 47 is arranged under the flexible plate 48, so that the heat carrier gas can be prevented from directly acting on the wear-resistant sealing block 44, and the wear-resistant sealing block 44 is protected. In use, the number of the balancing weights 52 can be appropriately increased or decreased according to the sealing condition, and the compression degree of the wear-resistant sealing block 44 and the sealing pad 45 is adjusted so as to ensure the sealing performance and prevent the wear-resistant sealing block 44 from wearing too fast.
As shown in fig. 5, the material conveying device 34 conveys the material carried by the feeding conveyor 20 from the installation low-point end of the furnace body 7 to the installation high-point end through the rotation of the furnace body 7 and the internal screw 53, and then falls into the furnace body 7 from the slow-falling discharge hole 54, so that the lifting height of the material is reduced when the material falls, and the dust of the material is reduced.
Through the technical scheme, the invention can bring the following technical effects:
1) The furnace end and the furnace tail of the equipment are sealed by adopting double sealing of combination of mechanical sealing and floating ring sealing, and the closed reaction space separates materials from raw materials and products, so that the raw materials and the products are not polluted by the outside, the environmental pollution is reduced, and the running safety of the equipment is ensured.
2) The heating mode is that the furnace wall and the pipe wall of the furnace body are indirectly heated, and meanwhile, the heat-carrying gas is recycled, so that the heat efficiency is greatly improved, the energy consumption of unit products is greatly reduced, and the purpose of energy conservation is achieved.
3) The two ends of all jackets are sealed by adopting a flexible double-layer sealing mode, so that the device has good tightness, and the energy consumption and the environmental pollution are reduced.
4) The furnace body is internally provided with a plurality of rows of tube bundles, and the compensation device solves the problems of thermal expansion of the pipeline and sealing of the distribution air chamber and the cylinder body, thereby improving the heat exchange area, reducing the equipment specification and saving the investment cost.
5) The reaction materials are fed and discharged on the same side, so that the space is saved, and the design of an air outlet and the design of a furnace end and a furnace tail seal are facilitated.
6) The furnace body is internally provided with a material conveying device with a preheating function, so that the reaction is quicker, and meanwhile, the dust raising height of conveyed materials is reduced by slowly falling down the material outlet.
The invention is not limited to the above embodiments, and based on the technical solution disclosed in the invention, a person skilled in the art may make some substitutions and modifications to some technical features thereof without creative effort according to the technical content disclosed, and all the substitutions and modifications are within the protection scope of the invention.
Claims (10)
1. An external heating rotary furnace with closed feeding and discharging sides is characterized in that: comprises a furnace body (7), a tube air inlet jacket (10), a tube air outlet jacket (5) and a middle jacket (8) are arranged on the outer wall of the furnace body (7), and a riding wheel device (12) for supporting the furnace body (7) is arranged between the three jackets; a tube bundle (25) distributed along the axial direction of the furnace body is arranged in the inner cavity of the furnace body (7), the tube array air inlet jacket (10) and the tube array air outlet jacket (5) and the tube bundle (25) form an independent heat carrier gas channel in the furnace body, and the middle jacket (8) and the outer wall of the furnace body (7) form an independent heat carrier gas channel outside the furnace body; each section of jacket is sealed by a flexible jacket seal (14); the front part of the furnace body (7) is provided with an air outlet device (17) and a power mechanism for driving the furnace body (7) to rotate, the tail part of the furnace body (7) is provided with a charging and discharging device (11) which is arranged on the same side, and sealing structures are arranged on the furnace body (7) corresponding to the air outlet device (17) and the charging and discharging device (11); the heat-carrying gas channel formed by the tube bundle inside the furnace body and the outer jacket can indirectly heat the materials in the furnace body.
2. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the furnace body (7) is erected on the riding wheel blocking device (13) and the riding wheel device (12) through a rolling ring I (6) and a rolling ring II (9) which are arranged on the furnace body to realize supporting.
3. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the head of the furnace body (7) is fixedly provided with a large gear ring (4), and the large gear ring (4) is meshed and driven through a pinion (3) connected with a transmission device (2) to drive the furnace body (7) to continuously run on a supporting roller device (13) and a supporting roller device (12) on a supporting device.
4. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the charging and discharging device (11) arranged on the same side comprises a charging device and a discharging device;
the feeding device comprises a feeding conveyor (20) extending into the furnace body, a conveying device (34) is arranged in the feeding conveyor (20), and a slow-falling discharge hole (54) is formed in the inner end part of the feeding conveyor (20); the discharging seal (21) is arranged between the discharging box (22) and the furnace body (7);
the discharging device comprises a discharging box (22) and an explosion venting device (19) arranged on the discharging box; the discharging end of the furnace body (7) is provided with a discharging cone (31) and a discharging cylinder section (33) connected with the discharging cone (31), and a reducing screw (32) is arranged in the discharging cone (31) and the discharging cylinder section (33).
5. The closed external heating rotary kiln with same feeding and discharging sides as described in claim 4, wherein: the diameter-variable screw (32) is a multi-head diameter-variable screw.
6. The closed external heating rotary kiln with same feeding and discharging sides as described in claim 4, wherein: the feeding device (34) comprises an internal screw (53) of helical blade construction; the whole furnace body (7) is obliquely installed, materials enter from the installation low-point end of the furnace body (7), are directly fed into the conveying device (34) through the feeding conveyor (20), and are conveyed to the installation high-point end of the furnace body (7) by the conveying device (34) along with the rotation of the furnace body (7), and fall into the furnace body (7) from the slow-falling discharge hole (54).
7. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the middle jacket (8) is provided with two air inlets (24) and one air outlet (27); the tube-array air outlet jacket (5) and the tube-array air inlet jacket (10) are respectively provided with an air outlet and an air inlet, and each air inlet and each air outlet are provided with a thermometer interface connected to the central control system; the tube bundles (25) axially distributed in the furnace body respectively correspond to the air outlets of the tube array air outlet jacket (5) and the air inlets of the tube array air inlet jacket (10), and air chamber air outlets (30) are distributed at the head of the furnace body (7); the tube bundles (25) are circumferentially arranged in the furnace body by taking the central axis of the furnace body (7) as a reference, and the tube bundles (25) can be arranged in a single circle or a plurality of circles.
8. The closed inlet and outlet side external heating rotary furnace according to claim 7, wherein: the tube bundles (25) are uniformly distributed along the axial center line inside the furnace body (7), one ends of the tube bundles (25) are fixed on the inner wall of the furnace body (7), the other ends of the tube bundles are movably connected to a tube plate inside the furnace body (7), and a compensation device (29) is arranged between the tube bundles (25) and the tube plate; the furnace body (7) is internally provided with a plurality of rows of pipe racks (26) for supporting the pipe bundles (25).
9. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the sealing structure between the furnace body (7) and the feeding and discharging device adopts a combined structure of mechanical seal and floating ring seal; the mechanical seal is in a double sealing surface structure of a movable ring and a static ring; an oil groove is formed in the sealing surface of the static ring (37), a plurality of air cylinders (35) for pressing the static ring are arranged on the static ring support frame (36), and the static ring support frame (36) is connected with a pipe frame of the feeding seal (15) through a compensator (43).
10. The closed external heating rotary kiln with same feeding and discharging sides as in claim 1, wherein: the flexible jacket seal (14) comprises a seal backing plate (45) arranged in the jacket, a cone flange (50) and a wear-resistant seal block (44) are respectively arranged on the seal backing plate (45), one end of a flexible plate (48) is connected with the cone flange (50), the other end of the flexible plate is connected with the wear-resistant seal block (44), the upper surface and the lower surface of the flexible plate (48) are respectively provided with a heat-resistant plate (46) and an elastic steel plate (49), and the lower part of the elastic steel plate (49) is connected with a balancing weight (52) through a steel wire rope (51); a wind deflector (47) is arranged on the flexible plate (48).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811115985.7A CN109269294B (en) | 2018-09-25 | 2018-09-25 | External heating rotary furnace with closed feeding and discharging at same side |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811115985.7A CN109269294B (en) | 2018-09-25 | 2018-09-25 | External heating rotary furnace with closed feeding and discharging at same side |
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| CN109269294B true CN109269294B (en) | 2024-02-06 |
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| EP3739283B1 (en) * | 2019-05-17 | 2022-02-23 | Heraeus Quarzglas GmbH & Co. KG | Method for treating free-flowing inorganic granulation and rotating pipe for carrying out the method |
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|---|---|---|---|---|
| CN201665655U (en) * | 2010-04-16 | 2010-12-08 | 西安三瑞实业有限公司 | Novel horizontal external-heat type rotary carbonization carbocoal furnace |
| CN202440462U (en) * | 2012-02-10 | 2012-09-19 | 西安三瑞实业有限公司 | Rotary cooling furnace for dry quenching of semi-coke |
| CN202829603U (en) * | 2012-08-31 | 2013-03-27 | 中国石油化工股份有限公司 | Continuous type rotary roasting furnace |
| CN209214320U (en) * | 2018-09-25 | 2019-08-06 | 西安三瑞实业有限公司 | The ipsilateral external heat type rotary furnace of closed charging and discharging |
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2018
- 2018-09-25 CN CN201811115985.7A patent/CN109269294B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201665655U (en) * | 2010-04-16 | 2010-12-08 | 西安三瑞实业有限公司 | Novel horizontal external-heat type rotary carbonization carbocoal furnace |
| CN202440462U (en) * | 2012-02-10 | 2012-09-19 | 西安三瑞实业有限公司 | Rotary cooling furnace for dry quenching of semi-coke |
| CN202829603U (en) * | 2012-08-31 | 2013-03-27 | 中国石油化工股份有限公司 | Continuous type rotary roasting furnace |
| CN209214320U (en) * | 2018-09-25 | 2019-08-06 | 西安三瑞实业有限公司 | The ipsilateral external heat type rotary furnace of closed charging and discharging |
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