Double-cylinder type continuous granulation device

Abstract

The invention belongs to the technical field of rotary kiln granulation equipment, and relates to a double-cylinder continuous granulation device which comprises a supporting frame, a rotating cylinder part and a heating device, the rotating cylinder part is horizontally and rotatably arranged on the supporting frame and comprises an outer cylinder and an inner cylinder which are coaxially arranged, and the front end and the rear end of the outer cylinder are provided with a feeding port and a discharging port respectively; a plurality of first stirring blades are arranged on the inner wall of the outer cylinder; the inner cylinder penetrates through the outer cylinder, an annular material channel is formed between the inner cylinder and the outer cylinder, and a plurality of second stirring blades are arranged on the outer wall of the inner cylinder; the heating device is arranged outside the outer barrel in a covering manner and is used for introducing hot air into the outer part of the outer barrel and the inner part of the inner barrel; the driving device is connected with the drum part and used for driving the inner drum and the outer drum to rotate in opposite directions. Materials are locked between the interlayer of the inner cylinder and the interlayer of the outer cylinder, the filling rate of the rotary kiln is effectively improved, and the productivity is improved on year-on-year basis; the inner and outer barrel wall blades are mutually staggered to extrude materials, so that the material tap density is improved; and through simultaneous heating of the inner cylinder and the outer cylinder, materials are heated more uniformly, and the granulation effect is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of rotary kiln granulation equipment, and in particular relates to a double-drum continuous granulation device. Background Art

[0002] The main raw material of new energy anode is petroleum coke. In order to improve the performance of the product, coating and granulation are particularly important in the production process. With the development of the industry, the production capacity requirements for anode materials are constantly increasing, the requirements for coating and granulation are becoming more and more stringent, and the energy consumption of product production is becoming more and more economical.

[0003] From the perspective of increasing production capacity, the traditional single batch production is changed to continuous production, and the rotary kiln can achieve continuous feeding and discharging. However, the filling rate of the traditional rotary kiln is generally 6%-10%, and the materials are piled up at the bottom of the kiln in a half-moon shape, and the filling rate is low. If the filling rate is deliberately increased, it will cause problems such as uneven heating of the materials and insufficient stirring.

[0004] In addition, in order to meet the compaction requirements of coated granulation and increase the compaction density of the powder, it is necessary to provide a certain extrusion force during the granulation process to make the material denser. However, the traditional rotary kiln requires the material to be looser to facilitate the thermal reaction of the material. As a result, the material with a low filling rate will not be effective when vibrated, and the granulation effect will be poor. In addition, the low filling rate leads to limited production capacity.

[0005] In addition, from the perspective of energy conservation, petroleum coke granulation uses external heating kilns, in which the bottom of the kiln is generally heated, and the material is heated on one side, and the heating effect of the material is not good. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a double-drum continuous granulation device for solving the problems of low filling rate, poor compaction effect and low energy utilization rate of traditional rotary kiln granulation.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: a double-drum continuous granulation device, comprising: Support frame; The rotating drum is horizontally rotatably arranged on the support frame, and the rotating drum comprises an outer drum and an inner drum arranged coaxially, the front end of the outer drum is connected with a feed port, and the rear end is connected with a discharge port, a plurality of first stirring blades are arranged on the inner wall of the outer drum, the inner drum penetrates and is sleeved in the outer drum, an annular material channel is formed between the inner drum and the outer drum, and a plurality of second stirring blades are arranged on the outer wall of the inner drum; A heating device, which is covered outside the outer cylinder and is used to pass hot air to the outside of the outer cylinder and the inside of the inner cylinder; The driving device is connected with the rotating drum member to drive the inner drum and the outer drum to rotate in opposite directions.

[0008] Compared with the prior art, the above technical solution has the following beneficial effects: By setting a coaxial inner cylinder inside the outer cylinder, the material is locked in the material channels between the inner and outer cylinders, which effectively improves the filling rate and the production capacity year-on-year; on the other hand, hot air is simultaneously introduced into the outside of the outer cylinder and the inside of the inner cylinder for heating, and both the inside and outside of the material channel are heated, which has a better heating effect and makes the material heated more evenly, which is more conducive to granulation; stirring blades are set on the outside of the inner cylinder and the inside of the outer cylinder to alternately squeeze the material from the inside and outside directions to increase the compacted density.

[0009] As a further improvement of the present invention, the first stirring blade is an intermittent spiral stirring blade, the end of the first stirring blade is tilted backward relative to the root, and the first stirring blade and the second stirring blade are staggered along the axial direction of the outer cylinder. The first stirring blade is set as an intermittent spiral stirring blade with a backward inclination, so that the outer cylinder can push the material toward the rear discharge port through the first stirring blade during the rotation process, and because the first stirring blade and the second stirring blade are staggered along the axial direction, it can be ensured that the two stirring blades do not interfere with each other during the rotation process, and squeeze the material from two directions respectively, thereby improving the tap density.

[0010] As a further improvement of the present invention, the second stirring blade includes a blade plate and a support rod, the blade plate is vertically arranged with respect to the radial surface of the inner cylinder, the root of the blade plate is connected with the inner cylinder, the end is inclined in the direction opposite to the rotation direction of the inner cylinder, and the support rod is connected between the outer cylinder and the end of the blade plate. The inner cylinder adopts vertical blades, so that the surface of the blade plate can form a beating and squeezing effect, and the gradual inclination can gradually compress the space between the material and the inner wall of the outer cylinder during the rotation, thereby improving the beating and squeezing effect; at the same time, since the second stirring blade is axially located between the two first stirring blades, during the rotation process, it cooperates with the first stirring blades on both sides to gather the material, so that the beating and squeezing effect of the second stirring blade is better.

[0011] As a further improvement of the present invention, the blade plate is gradually and continuously bent from the root to the tail to form a material meeting portion and an extrusion portion. At least one pressure breaking plate is vertically arranged on the extrusion portion, and the pressure breaking plate is arranged along the rotation direction of the inner cylinder, thereby improving the pressure breaking and breaking effect, meeting the granulation requirements, and making the long strips of material better broken into granules.

[0012] As a further improvement of the present invention, the heating device is divided into a first heating zone, a second heating zone and a third heating zone from front to back. The heating temperature can be set by zone, so that the temperature gradually increases from the first heating zone to the third heating zone, thereby improving the granulation effect. Furthermore, the first stirring blade extends from the first heating zone to the third heating zone; the second stirring blade extends from the first heating zone to the second heating zone, and a pressure breaking plate is provided on the second stirring blade located in the first heating zone. That is, the first heating zone is provided with a first stirring blade and a second stirring blade provided with a pressure breaking plate. At this time, the initial extrusion granulation of the material is completed by the dual cooperation of the first stirring blade and the second stirring blade with the pressure breaking plate, and the microscopic long strip material is broken, extruded and destroyed. Then, the second heating zone is provided with a first stirring blade and a second stirring blade. At this time, the second stirring blade can adopt the second stirring blade without a pressure breaking plate. After the initial extrusion granulation, extrusion granulation is performed again. At this time, the material particles after the initial granulation become smaller, so the second stirring blade with a pressure breaking plate may not be used for granulation. The third heating zone is provided with a first stirring blade. At this time, the second stirring blade may not be provided in the third heating zone, because the material particles roughly meet the requirements after two rounds of extrusion, and then the stirring and pushing of the first stirring blade at this time can complete the granulation of the material and transport it to the discharge port.

[0013] As a further improvement of the present invention, the first stirring blade and the second stirring blade are staggered along the circumferential intervals of the outer cylinder and the inner cylinder, respectively. In this way, when the first stirring blade and the second stirring blade overlap, they can mutually squeeze the material in the middle of the material channel, and the material is squeezed by resistance, which can help improve the compaction of the material. When the first stirring blade and the second stirring blade do not overlap, the material can be pushed backward from the gap set at the circumferential interval, and the pushed material is continuously improved in compaction and forward propulsion during repeated squeezing and pushing.

[0014] As a further improvement of the present invention, the heating device includes a heating cover arranged outside the outer cylinder, and an exhaust port is arranged on the top of the heating cover, and the exhaust port is connected with the rear end of the inner cylinder. Thus, the waste heat discharged from the outer cylinder is reused and sent into the inner cylinder, and the inner cylinder is heated from the back to the front, so that the material in the annular channel is heated on both the inside and the outside, which improves the heating of the material and is more conducive to granulation. At the same time, the waste heat is fully utilized, and the smoke in the inner cylinder is gradually discharged after being discharged, which greatly reduces the exhaust temperature and reduces energy loss.

[0015] As a further improvement of the present invention, a support tube is inserted into the inner tube, and a plurality of support members are arranged between the support tube and the inner tube along the axial direction thereof. The support members are arranged to support and fix the support tube and the outer inner tube, and to ensure that the interlayer between the support tube and the inner tube is connected from beginning to end, so as to create conditions for setting a waste heat reflux channel in the inner tube.

[0016] As a further improvement of the present invention, a partition is provided in the middle of the inner tube to seal the inner tube and divide it into a front temperature zone and a rear temperature zone along the axial direction, and a through hole connecting the inside and outside of the support tube is provided on the support tube wall near the rear side of the partition. Since the closer the material is to the discharge port, the higher the required reaction temperature, the partition and the through hole are provided to form a waste heat reflux channel in the rear temperature zone, thereby improving the waste heat utilization efficiency and saving energy.

[0017] The double-drum continuous granulation device of the present invention has the following technical effects or advantages: 1. Through the inner and outer tube structure, the material is locked between the inner and outer layers, which effectively improves the filling rate of the rotary kiln and increases the production capacity year-on-year.

[0018] 2. Blades are installed on the inner and outer cylinder walls, which squeeze the materials alternately and drive the materials forward, which can increase the compaction density of the powder.

[0019] 3. The exhaust flue gas heated on the outside of the outer tube is input into the inner tube again to heat the inner tube. The waste heat is fully utilized to save energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure along the radial direction of the outer cylinder in the present invention.

[0023] Figure 3 It is a schematic diagram of the cross-sectional structure along the axial direction of the outer cylinder in the present invention.

[0024] Figure 4 It is a partial schematic diagram of the structure of the second stirring blade in the present invention.

[0025] Among them: 1. support frame; 2. supporting member; 3. outer cylinder; 4. inner cylinder; 5. material channel; 6. first stirring blade; 7. second stirring blade; 701, blade plate; 7011, material receiving part; 7012, extrusion part; 702, support rod; 703, pressure breaking plate; 8. feed port; 9. discharge port; 10. driving device; 11. first heating zone; 12. second heating zone; 13. third heating zone; 14. heating cover; 15. exhaust port; 16. support cylinder; 17. supporting member; 18. partition; 19. through hole; 20. reflux channel. DETAILED DESCRIPTION

[0026] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0027] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0028] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0030] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1-4 As shown, a double-drum continuous granulation device provided by the present invention comprises: a support frame 1, a rotating drum, a driving device 10 for driving the rotating drum to rotate, and a heating device.

[0032] The support frame 1 is provided with a supporting member 2 similar to a roller bracket, which is used to support the two ends of the rotating drum. The rotating drum is horizontally rotatably arranged on the support frame 1, that is, the two ends of the rotating drum are mounted on the supporting member 2 on the support frame 1, which facilitates the rotating drum to rotate around its axial direction.

[0033] The rotating cylinder includes: an outer cylinder 3 and an inner cylinder 4. Correspondingly, there are two sets of supporting members 2, which are used to support the two ends of the outer cylinder 3 and the inner cylinder 4 respectively; the driving device 10 also includes two sets, which are used to drive the rotation of the outer cylinder 3 and the inner cylinder 4 respectively. The driving device 10 can be connected by a driving motor and a driving gear and a chain installed on the outer periphery of the outer cylinder 3 and the inner cylinder 4 (the driving chain connecting the driving gear and the driving motor is not shown in the figure), thereby driving the outer cylinder 3 and the inner cylinder 4 to rotate, so that the inner cylinder 4 and the outer cylinder 3 rotate in opposite directions.

[0034] Specifically, Figure 2-3 As shown, the circumference of both ends of the outer cylinder 3 is placed on the support frame 1 and in contact with the supporting member 2, and a plurality of first stirring blades 6 are arranged on the inner wall of the outer cylinder 3. The inner cylinder 4 is inserted through and sleeved in the outer cylinder 3, and the inner cylinder 4 and the outer cylinder 3 are arranged coaxially. The two ends of the inner cylinder 4 extend out of the two ends of the outer cylinder 3 and are rotatably supported by the supporting member 2 on the support frame 1. An annular material channel 5 is formed between the inner cylinder 4 and the outer cylinder 3. A plurality of second stirring blades 7 are arranged on the outer wall of the inner cylinder 4, and the first stirring blades 6 and the second stirring blades 7 both extend into the material channel 5. A feed port 8 is arranged at the front end of the outer cylinder 3 to facilitate feeding into the material channel 5, and a discharge port 9 is arranged at the rear end for discharging the material. The feed port 8 and the discharge port 9 are respectively installed with a feed pipe and a discharge device, and the feed pipe is obliquely inserted into the front end of the outer cylinder 3, and a rotary seal is arranged at the rear end of the outer cylinder 3, and a rotary seal of the discharge device is covered on the rear end of the outer cylinder 3.

[0035] The heating device is covered outside the outer tube 3 and located between the support frames 1 at both ends of the outer tube 3 , and is used to pass hot air to the outside of the outer tube 3 and the inside of the inner tube 4 to achieve heating of the inner and outer sides of the annular material channel 5 .

[0036] The driving device 10 is connected to the rotating drum. By arranging a coaxial inner cylinder 4 inside the outer cylinder 3, the material is locked between the material channels 5 between the inner and outer cylinders 3. After a period of time after feeding, the material continuously fills the entire annular channel between the inner and outer cylinders 3. It is calculated that the annular cross-section of the outer cylinder 3 with the same diameter is larger than the semi-lunar area, which effectively improves the filling rate of the rotary kiln and increases the unit production capacity. On the other hand, hot air is simultaneously introduced into the outside of the outer cylinder 3 and the inside of the inner cylinder 4 for heating. The inside and outside of the material channel 5 are heated, and the heating effect is better, which is more conducive to granulation. Stirring blades are arranged on the outside of the inner cylinder 4 and the inside of the outer cylinder 3 to extrude the material in an alternating manner from the inside and outside directions to improve the compacted density.

[0037] like Figure 3As shown, in this embodiment, the first stirring blade 6 is an intermittent spiral stirring blade, and the first stirring blade 6 and the second stirring blade 7 are staggered along the axial direction of the outer cylinder 3, that is, a plurality of first stirring blades 6 are arranged at intervals on the inner wall of the outer cylinder 3, and the second stirring blade 7 is arranged on the outer wall of the inner cylinder 4 corresponding to the spacing between the two first stirring blades 6, forming a staggered arrangement of the first stirring blade 6 and the second stirring blade 7, and a plurality of first stirring blades 6 and second stirring blades 7 are arranged along the axial direction, so that the material channel 5 has a stirring effect; at the same time, the first stirring blade 6 is set as an intermittent spiral stirring blade, and the outer cylinder 3 can push the material toward the rear discharge port 9 through the first stirring blade 6 during the rotation process, and the material entering from the feed port 8 is gradually moved toward the rear discharge port 9 through the push of the first stirring blade 6, and the staggered arrangement can ensure that the two stirring blades do not interfere with each other during the rotation process, and squeeze the material from two directions respectively. The end of the first stirring blade 6 is tilted backward relative to the root. Since the first stirring blade 6 is a spiral stirring blade, in order to improve the spiral pushing effect, the backward tilt angle of the spiral blade is set to 1-5°, thereby making it more convenient to push the material in an orderly manner.

[0038] like Figure 2 As shown, in order to ensure that the material is pushed and squeezed at all times, the first stirring blade 6 and the second stirring blade 7 are respectively arranged in multiple staggered intervals along the circumference of the outer cylinder 3 and the inner cylinder 4, that is, the first stirring blade 6 and the second stirring blade 7 arranged alternately along the axial direction are arranged at intervals along the circumference. In this embodiment, four sections of the first stirring blade 6 are arranged on the circumference of the inner wall of the outer cylinder 3, and four sections of the second stirring blade 7 are arranged on the circumference of the outer wall of the inner cylinder 4. When the outer cylinder 3 and the inner cylinder 4 rotate in opposite directions, the first stirring blade 6 and the second stirring blade 7 can be repeatedly overlapped and crossed in the axial perspective. In this way, when the first stirring blade 6 and the second stirring blade 7 overlap, they can squeeze the material in the middle of the material channel 5, and the material is squeezed by resistance, which can help to improve the tap density of the material. When the first stirring blade 6 and the second stirring blade 7 do not overlap, the material can be pushed backward from the gap set at the circumferential interval. The material is pushed, and the material continuously improves the tap density and pushes backward during repeated squeezing and pushing.

[0039] like Figure 4As shown, in order to improve the extrusion and compaction effect, the second stirring blade 7 is set as a blade plate 701 and a support rod 702. The blade plate 701 is arranged perpendicularly to the radial surface of the inner cylinder 4 (that is, the inner cylinder 4 adopts a vertical blade), so that when the blade plate 701 rotates around the inner cylinder 4, the surface of the blade plate 701 can beat the material in the rotation plane where it is located. Specifically, the root of the blade plate 701 is connected to the inner cylinder 4, and the end is inclined in the direction opposite to the rotation direction of the inner cylinder 4. The multiple blade plates 701 arranged on the circumference of the inner cylinder 4 have a good beating and compaction effect when rotating; at this time, the support rod 702 is connected between the outer cylinder 3 and the end of the blade plate 701, which plays the effect of supporting the end of the blade plate 701. The vertical setting allows the surface of the blade plate 701 to form a beating and squeezing effect, and the gradual inclination can gradually compress the space between the material and the inner wall of the outer cylinder 3 during rotation, thereby improving the beating and squeezing effect. At the same time, the second stirring blade 7 is axially located between the two first stirring blades 6. During rotation, the first stirring blades 6 on both sides cooperate to gather the material, thereby achieving a good beating and squeezing effect of the first stirring blade 6.

[0040] Specifically, the blade plate 701 is gradually and continuously bent from the end connected to the outer cylinder 3 as the starting end to the outer end to form a material receiving portion 7011 and an extrusion portion 7012. The surface of the material receiving portion 7011 is gradually inclined. When rotating, the material is gradually pushed. The extrusion portion 7012 is roughly parallel to the cross section where the vertical line of the inner cylinder 4 is located, completing the final extrusion of the material to increase the tap density. In order to improve the granulation effect, at least one pressure-breaking plate 703 can be vertically arranged on the extrusion portion 7012. The pressure-breaking plate 703 is arranged along the rotation direction of the inner cylinder 4. When the pressure-breaking plate 703 rotates with the blade plate 701, the material contacted by the extrusion portion 7012 on the blade plate 701 can be squeezed, so that the long strip of material can be better broken into particles, the pressure-breaking and breaking effect can be improved, and the granulation requirements can be met.

[0041] like Figure 3 As shown, several heating zones are formed in the coverage of the heating device, and the heating zones include at least a first heating zone 11, a second heating zone 12 and a third heating zone 13 which are arranged in sequence along the axial direction from the feed port 8. The division of the heating zones can be specifically divided into different types according to the temperature, and each heating zone can be subdivided into multiple heating zones, and the multiple heating zones in the heating device are not limited to the above three heating zones. In this embodiment, the heating zones are separated by vertical plates, etc., and the first heating zone 11 and the second heating zone 12 are further divided into two heating zones to facilitate more precise temperature settings and improve the granulation effect.

[0042] In this embodiment, the temperature of the first heating zone 11 to the third heating zone 13 is gradually increased, and the first stirring blade 6 extends from the first heating zone 11 to the third heating zone 13; the second stirring blade 7 extends from the first heating zone 11 to the second heating zone 12, and the second stirring blade 7 located in the first heating zone 11 is provided with a pressure-breaking plate 703, that is, the first heating zone 11 is provided with the first stirring blade 6 and the second stirring blade 7 provided with the pressure-breaking plate 703. At this time, the preliminary extrusion granulation of the material is completed by the dual cooperation of the first stirring blade 6 and the second stirring blade 7 with the pressure-breaking plate 703, and the microscopic long strip material is broken, extruded and destroyed. The second heating zone 12 is provided with a first stirring blade 6 and a second stirring blade 7. At this time, the second stirring blade 7 can adopt the second stirring blade 7 without a pressure breaking plate 703. After the initial extrusion granulation, extrusion granulation is performed again. At this time, the material particles after the initial granulation become smaller, so the second stirring blade 7 with a pressure breaking plate 703 can be omitted for granulation. The third heating zone 13 is provided with a first stirring blade 6. At this time, the second stirring blade 7 can be omitted in the third heating zone 13. After two rounds of extrusion, the material particles roughly meet the requirements. At this time, the stirring and pushing of the first stirring blade 6 can complete the granulation of the material and transport it to the discharge port 9.

[0043] like Figure 1 , Figure 3 As shown, the heating device includes a heating cover 14 which is arranged outside the outer tube 3. Hot air is introduced into the heating cover 14 at the bottom of the outer tube 3, and an exhaust port 15 is arranged at the top of the heating cover 14. The hot air will be discharged through the exhaust port 15 along the gap between the heating cover 14 and the outer tube 3. The exhaust port 15 is connected to the rear end of the inner tube 4, so that the waste heat discharged from the exhaust port 15 outside the outer tube 3 is reused and introduced into the inner tube 4 again. The reuse of waste heat can reduce energy loss. In this embodiment, since the heating device is divided into a plurality of heating zones, correspondingly, each heating zone is provided with an independent hot air inlet at the bottom and an independent exhaust port 15 at the top.

[0044] In order to improve the structural strength of the inner tube 4, a support tube 16 is passed through the inner tube 4, and a plurality of support members 17 are arranged between the support tube 16 and the inner tube 4 along the axial direction. The support members 17 are arranged to support and fix the support tube 16 and the inner tube 4 outside, and to ensure that the interlayer between the outside of the support tube 16 and the inside of the inner tube 4 remains connected from beginning to end, and the support tube 16 and the inner tube 4 are arranged coaxially.

[0045] Furthermore, in this embodiment, a partition 18 is provided inside the inner tube 4 to seal and divide the inner tube 4 into a front temperature zone and a rear temperature zone along the axial direction. A through hole 19 is provided on the wall of the support tube 16 near the rear side of the partition 18 to connect the inside and outside of the support tube 16. The partition 18 is provided to seal the radial plane in the inner tube 4, including the radial plane where the internal support tube 16 is located, and has the effect of cutting off the inside of the inner tube 4 and the inside of the support tube 16 at this time. In this embodiment, the partition 18 is approximately arranged in the middle of the inner tube 4, located in the second heating zone 12 in the heating device, and is used to roughly divide and form a front temperature zone and a rear temperature zone. The front temperature zone and the rear temperature zone roughly represent a low temperature zone and a high temperature zone. In the front temperature zone, the temperature required for heating the outer tube 3 is relatively low, and there is no need to reuse the waste heat; in the rear temperature zone, the temperature required for heating the outer tube 3 is relatively high, and the flue gas discharged from the exhaust port 15 is sent into the inner tube 4 to heat the inner tube, so as to realize the reuse of waste heat and reduce energy loss. The division of this temperature zone is not fixed and can be divided into different ones according to actual conditions. By providing the partition plate 18 and the through hole 19, the waste heat forms a waste heat reflux channel 20 in the post-temperature zone, so that the waste heat is sent into the connecting area.

[0046] In this embodiment, the waste heat discharged from the exhaust port 15 of the heating device is connected to the annular space between the inner tube 4 and the support tube 16 through the air inlet pipe arranged at one end near the discharge port 9, and then enters the interior of the support tube 16 through the through hole 19 and is finally discharged from the end of the support tube 16. In specific implementation, there may be other variations, such as the waste heat in the exhaust port 15 of the heating device is connected to the end of the support tube 16 near the discharge port 9, and then discharged from the exhaust pipe arranged at the end of the inner tube 4 through the through hole 19.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-drum continuous granulation device, characterized in that: include: Support frame; A rotating drum member is horizontally rotatably arranged on the support frame, the rotating drum member comprises an outer drum and an inner drum arranged coaxially, the front end of the outer drum is connected to a feed port, and the rear end is connected to a discharge port, a plurality of first stirring blades are arranged on the inner wall of the outer drum, the inner drum penetrates and is sleeved in the outer drum, an annular material channel is formed between the inner drum and the outer drum, and a plurality of second stirring blades are arranged on the outer wall of the inner drum; A heating device, which is disposed outside the outer cylinder and is used to introduce hot air to the outside of the outer cylinder and the inside of the inner cylinder; A driving device is connected to the rotating cylinder and is used to drive the inner cylinder and the outer cylinder to rotate in opposite directions.

2. The double-drum continuous granulation device according to claim 1, characterized in that: The first stirring blade is an intermittent spiral stirring blade, the end of the first stirring blade is tilted backward relative to the root, and the first stirring blade and the second stirring blade are staggered along the axial direction of the outer cylinder.

3. The double-drum continuous granulation device according to claim 1, characterized in that: The second stirring blade includes a blade plate and a support rod. The blade plate is arranged perpendicular to the radial surface of the inner cylinder. The root of the blade plate is connected to the inner cylinder and the end is inclined in the direction opposite to the rotation direction of the inner cylinder. The support rod is connected between the outer cylinder and the end of the blade plate.

4. The double-drum continuous granulation device according to claim 3, characterized in that: The blade plate is gradually and continuously bent from the root to the tail to form a material receiving portion and an extrusion portion. At least one pressure-breaking plate is vertically arranged on the extrusion portion, and the pressure-breaking plate is arranged along the rotation direction of the inner cylinder.

5. The double-drum continuous granulation device according to claim 4, characterized in that: The heating device is divided into a first heating zone, a second heating zone and a third heating zone from front to back.

6. The double-drum continuous granulation device according to claim 5, characterized in that: The first stirring blade extends from the first heating zone to the third heating zone, the second stirring blade extends from the first heating zone to the second heating zone, and the pressure breaking plate is arranged on the second stirring blade located in the first heating zone.

7. The double-drum continuous granulation device according to any one of claims 1 to 6, characterized in that: The first stirring blades and the second stirring blades are arranged alternately along the circumferential directions of the outer cylinder and the inner cylinder respectively.

8. The double-drum continuous granulation device according to claim 1, characterized in that: The heating device comprises a heating cover which is arranged outside the outer cylinder, and an exhaust port is arranged on the top of the heating cover, and the exhaust port is communicated with the rear end of the inner cylinder.

9. The double-drum continuous granulation device according to claim 8, characterized in that: A supporting tube is inserted into the inner tube, and a plurality of supporting members are arranged between the supporting tube and the inner tube at intervals along the axial direction thereof.

10. The double-drum continuous granulation device according to claim 9, characterized in that: A partition is provided in the middle of the inner tube to seal the inner tube and divide the inner tube into a front temperature zone and a rear temperature zone along the axial direction. A through hole connecting the inside and outside of the support tube is opened on the wall of the support tube near the rear side of the partition.

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