Rotary carbonization furnace

Abstract

The present invention relates to a rotary carbonization furnace. The rotary carbonization furnace includes a rotary furnace (1) and a feed bin (21) and a discharge bin (22) respectively located at both ends of the rotary furnace (1). The rotary furnace (1) is provided with heat energy for drying materials by a heat source. The rotary furnace (1) includes an outer rotary furnace (11) and an inner rotary furnace (12) arranged coaxially. The outer rotary furnace (11) and the inner rotary furnace (12) are driven to rotate by their respective transmission devices (3); both ends of the outer rotary furnace (11) and the inner rotary furnace (12) extend into the interior of the feed bin (21) and the discharge bin (22) respectively, and the outer rotary furnace (11) is rotationally and sealingly connected to the feed bin (21) and the discharge bin (22); the outer rotary furnace (11) and the inner rotary furnace (12) can be heated by the heat source at the same time so as to form a material carbonization space between the inner wall of the outer rotary furnace (11) and the outer wall of the inner rotary furnace (12); a lifter (4) for stirring and conveying the materials is arranged on the inner wall of the outer rotary furnace (11). The rotary carbonization furnace has a relatively high carbonization efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbonization furnaces, and particularly relates to a rotary carbonization furnace. Background Art

[0002] With the development of society, a large amount of solid waste has been generated in the process of human production and life, such as waste activated carbon, municipal sludge, and organic contaminated soil. With the increasing awareness of environmental protection in various countries, the treatment of solid waste has attracted the attention of governments of various countries. At present, in the field of solid waste treatment, the incineration treatment technology is widely used. However, dioxins are easily generated during the incineration process, causing secondary pollution, and the cost of incineration treatment is relatively high. The pyrolysis carbonization technology has low treatment cost, high energy recovery rate, and does not produce secondary pollution, which better meets the requirements of environmental friendliness. Therefore, the attention of various countries to it has been greatly improved.

[0003] At present, for existing carbonization furnaces to achieve continuous operation of the equipment, generally two methods are adopted: (1) Using a spiral shaft inside the carbonization furnace to achieve continuous feeding and discharging of materials. A rotary carbonization furnace disclosed in the invention patent 201520621091.0, the spiral shaft is driven by a rotating device to rotate relative to the furnace body, and the extrusion between the spiral shaft and the materials is used to achieve the transportation of the materials. Adding a spiral shaft inside the carbonization furnace and the extrusion between the spiral shaft and the materials are beneficial to removing the tar adhered to the inner wall of the furnace body and reducing fouling. However, the friction between the spiral shaft and the furnace body accelerates the wear of the equipment. (2) Using the rotation of the carbonization furnace to achieve stirring and transportation of materials. There are lifters arranged on the inner wall of the carbonization furnace. When the carbonization furnace rotates, the materials are lifted and pushed forward. An invention patent 201410214501.X discloses such a rotary carbonization furnace, which includes a rotating cylinder, a feeder and a discharger, a combustion chamber, a flue and a flue gas passage. The rotation of the rotating cylinder achieves stirring and transportation of materials. The materials slide along its inner wall, like a dough sliding in an iron pot, and in most cases, there is only one heating surface. Moreover, although the materials as a whole are moving, the displacement between the materials inside is very small, resulting in low carbonization efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a rotary carbonization furnace that can improve the carbonization efficiency.

[0005] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0006] Rotary carbonization furnace, comprising a rotary furnace and a feed bin and a discharge bin respectively located at both ends of the rotary furnace. The rotary furnace is provided with heat energy for drying materials by a heat source. The rotary furnace comprises an outer rotary furnace and an inner rotary furnace arranged coaxially. The outer rotary furnace and the inner rotary furnace are driven to rotate by their respective transmission devices. Both ends of the outer rotary furnace and the inner rotary furnace respectively extend into the interiors of the feed bin and the discharge bin. The outer rotary furnace is rotationally and sealingly connected to the feed bin and the discharge bin. The outer rotary furnace and the inner rotary furnace can be heated by the heat source simultaneously, so as to form a material carbonization space between the inner wall of the outer rotary furnace and the outer wall of the inner rotary furnace. The inner wall of the outer rotary furnace is provided with lifters for stirring and conveying materials.

[0007] As an improvement, the outer rotary furnace is provided with an outer rotary furnace heating jacket. A flue gas passage is arranged inside the inner rotary furnace. The heat source is high-temperature flue gas. The high-temperature flue gas realizes the heating of the outer rotary furnace and the inner rotary furnace through the outer rotary furnace heating jacket and the flue gas passage respectively.

[0008] As a further improvement, a flue gas outlet a and a flue gas inlet a are respectively arranged at the upper and lower parts of the outer rotary furnace heating jacket. A flue gas outlet b and a flue gas inlet b are respectively arranged at both ends of the inner rotary furnace.

[0009] As an improvement, the transmission device comprises a transmission motor, a first sprocket, a chain and a second sprocket. The first sprocket is installed on the transmission motor. The second sprocket is installed on the rotary furnace. The chain connects the first sprocket and the second sprocket.

[0010] As an improvement, a spiral feeding device is arranged in the feed bin. A feed inlet is arranged at the upper part of the feed bin. The spiral feeding device is located below the feed inlet.

[0011] As an improvement, the discharge bin is provided with a discharge port and a gas outlet.

[0012] As a further improvement, outer fins are arranged on the inner rotary furnace. The outer fins are arranged along the axial direction of the inner rotary furnace.

[0013] The beneficial effects of the present invention are as follows:

[0014] (1) An inner rotary furnace is arranged in the outer rotary furnace. The outer rotary furnace is heated by the outer rotary furnace heating jacket. The inner rotary furnace is heated by the high-temperature flue gas passing through its interior. The materials scooped up by the outer rotary furnace fall onto the outer wall of the inner rotary furnace during the falling process and continue to exchange heat with the inner rotary furnace. The arrangement of the inner rotary furnace increases the heat exchange area of the entire carbonization furnace, improves the heat transfer rate, and enables the materials to be heated at multiple angles between the outer rotary furnace and the inner rotary furnace, which is beneficial to improving the carbonization efficiency.

[0015] (2) In the existing externally-rotating carbonization furnace, there is always an area on the inner wall of the external rotary furnace that does not come into direct contact with the material during rotation, or there is less material on this area. This area is often located on the side of the external rotary furnace in the direction of material falling. In this solution, by increasing the rotation speed of the internal rotary furnace, part of the material that has just fallen onto the internal rotary furnace from the top of the external rotary furnace can be thrown to the side of the external rotary furnace in the direction of material falling, thus making full use of the inner wall of the external rotary furnace.

[0016] (3) Inside the carbonization furnace, the material is continuously scooped up by the scraper on the external rotary furnace and then falls onto the internal rotary furnace. The material continuously impacts and rubs between the external and internal rotary furnaces, which is conducive to breaking large-particle-size materials into small-particle-size materials, increasing the specific surface area of the material, and improving the processing efficiency.

[0017] (4) The outer wall of the internal rotary furnace is provided with fins. The fins provide a support for the material falling onto the internal rotary furnace and also further increase the heat exchange area. The volume between two adjacent fins can accumulate part of the material, increasing the contact time between the material and the outer wall and fins of the internal rotary furnace, thereby increasing the heat conduction time and further improving the heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a cross-sectional view of the rotary furnace of the present invention;

[0020] Figure 3 is a state diagram of the material rolling in the rotary furnace.

[0021] In the figure: 1, rotary furnace; 11, external rotary furnace; 12, internal rotary furnace; 121, flue gas outlet b; 122, flue gas inlet b; 123, external fins; 124, reinforcing ribs; 13, external rotary furnace heating jacket; 131, flue gas outlet a; 132, flue gas inlet a; 14, flue gas channel; 21, feed bin; 211, feed inlet; 22, discharge bin; 221, gas outlet; 222, discharge outlet; 3, drive device; 301, drive motor; 302, first sprocket; 303, chain; 304, second sprocket; 4, scraper; 5, screw feeding device; 6, base. DETAILED DESCRIPTION OF THE INVENTION

[0022] Embodiment 1

[0023] As Figure 1 、 Figure 2As shown in the figure, the rotary carbonization furnace of the present invention includes a rotary furnace 1 and a feed bin 21 and a discharge bin 22 respectively located at both ends of the rotary furnace 1. A spiral feeding device 5 is provided in the feed bin 21. A feed inlet 211 is provided at the upper part of the feed bin 21, and the spiral feeding device 5 is located below the feed inlet 211. The discharge bin 22 is provided with a discharge port 222 and a gas outlet 221. The rotary furnace 1 includes an outer rotary furnace 11 and an inner rotary furnace 12 arranged coaxially. The outer rotary furnace 11 and the inner rotary furnace 12 are driven to rotate by their respective transmission devices 3. Both ends of the outer rotary furnace 11 and the inner rotary furnace 12 extend into the interiors of the feed bin 21 and the discharge bin 22 respectively, and the outer rotary furnace 11 is rotationally and sealingly connected to the feed bin 21 and the discharge bin 22. A lifter 4 for stirring and conveying materials is provided on the inner wall of the outer rotary furnace 11. Outer fins 123 are arranged on the inner rotary furnace 12, and the outer fins 123 are arranged along the axial direction of the inner rotary furnace 12. Reinforcing ribs 124 are also provided on the outer wall of the inner rotary furnace 12.

[0024] The outer rotary furnace 11 is provided with an outer rotary furnace heating jacket 13, and a flue gas passage 14 is provided inside the inner rotary furnace 12. The rotary furnace 1 is provided with heat energy for drying materials by a heat source. The heat source is high-temperature flue gas, and the high-temperature flue gas realizes the heating of the outer rotary furnace 11 and the inner rotary furnace 12 through the outer rotary furnace heating jacket 13 and the flue gas passage 14 respectively. The outer rotary furnace heating jacket 13 and the flue gas passage 14 can be connected to make the high-temperature flue gas form a cycle. During operation, the outer rotary furnace 11 and the inner rotary furnace 12 can be heated by the heat source at the same time, so as to form a material carbonization space between the inner wall of the outer rotary furnace 11 and the outer wall of the inner rotary furnace 12. As an obvious deformation, the outer rotary furnace 11 or the inner rotary furnace 12 can also adopt an electric heating mode.

[0025] A flue gas outlet a131 and a flue gas inlet a132 are respectively provided at the upper and lower parts of the outer rotary furnace heating jacket 13; flue gas outlets b121 and flue gas inlets b122 are respectively provided at both ends of the inner rotary furnace 12.

[0026] The transmission device 3 includes a transmission motor 301, a first sprocket 302, a chain 303, and a second sprocket 304. The first sprocket 302 is installed on the transmission motor 301, the second sprocket 304 is installed on the rotary furnace 1, and the chain 303 connects the first sprocket 302 and the second sprocket 304. The rotation speed and rotation direction of the transmission motor 301 are adjustable.

[0027] The rotary carbonization furnace as a whole is located on a base 6, and the base 6 is made of section steel.

[0028] Materials enter the feed bin 21 from the feed inlet 211, and the spiral conveying device 5 below the feed inlet 211 conveys the materials into the outer rotary furnace 11. In the rotating outer rotary furnace 11, the materials are lifted by the lifter 4, which plays a role in stirring and conveying the materials.

[0029] The copying plate 4 forms a certain angle α with the tangential direction of the wall of the external converter 11 and a certain angle β with the axis direction of the external converter 5, where α = 60° - 75° and β = 10° - 20°. When the external converter 11 rotates, the copying plate 4 contacts the material. Since the copying plate 4 protrudes from the inner wall surface of the external converter 11, when the external converter 11 rotates, the copying plate 4 will drive the material to move together, that is, the material is lifted up. The copying plate 4 forms a certain angle α with the tangential direction of the wall of the external converter 11 and a certain angle β with the axis direction of the external converter 5. The material is lifted to a certain height and, under the action of gravity, begins to slide down and obtains a certain initial velocity in the direction of the material's movement, thus realizing the stirring and conveying of the material.

[0030] The material completes the heat exchange process with the inner wall of the external converter 11 and the copying plate 4. The lifted material falls into the space between adjacent outer fins 123 of the inner converter 12 during the falling process, and the material continues to exchange heat with the inner converter. Some materials accumulate between adjacent outer fins 123, increasing the contact time between the material and the inner converter 2, which is beneficial to improving the heat transfer efficiency. As Figure 3 shown, when the external converter 11 rotates in the shown rotation direction, due to gravity, very little material directly contacts the left side of its inner wall. By adjusting the rotation speed of the inner converter 12, the material that has just fallen from the top of the external converter 11 to the inner converter 12 is partially thrown to the left inner wall of the external converter 11, so that all inner walls of the external converter 11 are fully utilized. The gas generated during the material treatment process is discharged from the gas outlet 221 of the discharge bin 22, and the treated material is discharged from the discharge port 222 of the discharge bin 22.

Claims

1. A method for improving carbonization efficiency using a rotary carbonization furnace, which adopts a rotary furnace (1) composed of an outer rotary furnace (11) and an inner rotary furnace (12) arranged coaxially. The outer rotary furnace (11) and the inner rotary furnace (12) are driven to rotate by their respective transmission devices (3). Feed bins (21) and discharge bins (22) are provided at both ends of the rotary furnace (1), and external heat sources provide the heat energy for drying the materials. Characterized in that: The outer rotary furnace (11) and the inner rotary furnace (12) can be heated by the heat source at the same time, so as to form a material carbonization space between the inner wall of the outer rotary furnace (11) and the outer wall of the inner rotary furnace (12); a lifter (4) for stirring and conveying the materials is arranged on the inner wall of the outer rotary furnace (11). As the outer rotary furnace (11) rotates, the lifter (4) scoops up the materials and scatters them onto the outer wall of the inner rotary furnace (12), so that the materials continue to exchange heat with the inner rotary furnace (12) and the materials continuously collide and rub between the inner and outer rotary furnaces; the inner rotary furnace (12) rotates in the same direction as the outer rotary furnace (11), and external fins (123) for piling up part of the materials are arranged on the inner rotary furnace (12). By adjusting the rotation speed of the inner rotary furnace (12) faster, the materials that just fall onto the inner rotary furnace (12) from the top of the outer rotary furnace (11) are thrown to the side in the direction of the material falling in the outer rotary furnace (11); both ends of the outer rotary furnace (11) and the inner rotary furnace (12) respectively extend into the inside of the feed bin (21) and the discharge bin (22), and the outer rotary furnace (11) is rotationally and sealingly connected to the feed bin (21) and the discharge bin (22).

2. The method for improving carbonization efficiency using a rotary carbonization furnace according to claim 1, Characterized in that: The outer rotary furnace (11) is provided with an outer rotary furnace heating jacket (13), and a flue gas passage (14) is arranged inside the inner rotary furnace (12). The heat source is high-temperature flue gas, and the high-temperature flue gas realizes the heating of the outer rotary furnace (11) and the inner rotary furnace (12) through the outer rotary furnace heating jacket (13) and the flue gas passage (14) respectively.

3. The method for improving carbonization efficiency using a rotary carbonization furnace according to claim 2, Characterized in that: A flue gas outlet a (131) and a flue gas inlet a (132) are respectively arranged at the upper and lower parts of the outer rotary furnace heating jacket (13); a flue gas outlet b (121) and a flue gas inlet b (122) are respectively arranged at both ends of the inner rotary furnace (12).

4. The method for improving carbonization efficiency using a rotary carbonization furnace according to claim 1, Characterized in that: The transmission device (3) includes a transmission motor (301), a first sprocket (302), a chain (303), and a second sprocket (304). The first sprocket (302) is installed on the transmission motor (301), the second sprocket (304) is installed on the rotary furnace (1), and the chain (303) connects the first sprocket (302) and the second sprocket (304).

5. The method for improving carbonization efficiency using a rotary carbonization furnace according to claim 1, Characterized in that: A screw feeding device (5) is arranged in the feed bin (21), a feed inlet (211) is arranged at the upper part of the feed bin (21), and the screw feeding device (5) is located below the feed inlet (211).

6. The method for improving carbonization efficiency by using a rotary carbonization furnace as described in claim 1, characterized in that: the discharge bin (22) is provided with a discharge port (222) and a gas outlet (221).

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