An externally heated rotary device

Abstract

The present application discloses an externally heated rotary device, comprising a drum and a combustion cylinder. The combustion cylinder is hermetically sleeved on the outer periphery of the drum, and the drum rotates relative to the fixedly arranged combustion cylinder. It is characterized in that it further comprises a material lifting plate arranged on the outer wall of the drum and located inside the combustion cylinder. During the rotation of the drum, the material lifting plate rotates together with the drum, and the material lifting plate lifts the energy material accumulated at the bottom of the combustion cylinder, enabling the energy material to diffuse and burn inside the combustion cylinder, accelerating the combustion speed, increasing the combustion range, enabling the energy material to burn fully, saving energy consumption, and the generated heat can meet the heating requirements, thereby improving the combustion efficiency of the energy material.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary equipment, and particularly to an externally heated rotary equipment. Background Art

[0002] The existing externally heated rotary equipment mainly includes a drum and a combustion cylinder. The combustion cylinder is sleeved on the outer periphery of the drum. The drum rotates relative to the relatively fixed combustion cylinder, and the material tumbles and moves in the drum. The heat generated by the combustion of the energy substance in the combustion cylinder is transferred to the material in the drum through the wall of the drum. However, the energy substance in the combustion cylinder burns insufficiently, the heat cannot meet the requirements, and the energy substance is wasted.

[0003] In summary, how to improve the combustion efficiency of the combustion cylinder has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an externally heated rotary equipment to improve the combustion efficiency of the combustion cylinder.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] An externally heated rotary equipment, including a drum and a combustion cylinder. The combustion cylinder is hermetically sleeved on the outer periphery of the drum, and the drum rotates relative to the relatively fixed combustion cylinder; it further includes a material lifting plate arranged on the outer wall of the drum and located in the combustion cylinder.

[0007] Preferably, in the above externally heated rotary equipment, the material lifting plates are distributed along the axial and circumferential directions of the drum.

[0008] Preferably, in the above externally heated rotary equipment, the rotating surface formed by the rotation of the ends of multiple material lifting plates is continuous in the axial direction of the drum.

[0009] Preferably, in the above externally heated rotary equipment, the material lifting surface of the material lifting plate is parallel or inclined to the axial direction of the drum.

[0010] Preferably, in the above externally heated rotary equipment, the material lifting surface of the material lifting plate is inclined towards the feeding end of the drum, so that the moving direction of the energy substance in the combustion cylinder is opposite to the moving direction of the material in the drum.

[0011] Preferably, in the above externally heated rotary equipment, the end of the material lifting plate is a bent portion bent along the rotation direction of the drum.

[0012] Preferably, in the above externally heated rotary equipment, the bent portion of the material lifting plate is provided with a material leakage notch.

[0013] Preferably, in the above external heat rotary equipment, a gas communication cavity isolated from the inside of the drum is further included. The gas communication cavity is communicated with the combustion cylinder through a communication hole provided on the cylinder wall of the drum, and is used to introduce the heating gas in the combustion cylinder into the gas communication cavity. The cavity wall of the gas communication cavity is used for heat transfer with the materials in the drum.

[0014] Preferably, in the above external heat rotary equipment, at least one of the communication holes is provided between two adjacent material lifting plates in the circumferential direction, and is used to disturb the heating gas in the combustion cylinder, so that the heating gas enters the gas communication cavity and generates irregular convection.

[0015] Preferably, in the above external heat rotary equipment, the gas communication cavity is a continuous cavity structure or a plurality of split cavity structures.

[0016] Preferably, in the above external heat rotary equipment, one side cavity wall of the gas communication cavity is fixedly attached to or shared with the inner wall of the drum, and the communication hole is provided on the cylinder wall where the gas communication cavity is attached to or shared with the drum.

[0017] Preferably, in the above external heat rotary equipment, the gas communication cavity is one or more groups of spiral structure cavities, the spiral structure cavities extend spirally along the axial direction of the drum, and the side wall of the spiral structure cavity forms a spiral material channel with the cylinder wall of the drum.

[0018] Preferably, in the above external heat rotary equipment, one or more communication holes are provided on the cylinder wall where the spiral structure cavity is attached to or shared with the drum, and the plurality of communication holes are arranged along the spiral direction.

[0019] Preferably, in the above external heat rotary equipment, the spiral structure cavity is an annular spiral structure cavity, and there is a radial distance between the inner circle of the annular spiral structure cavity and the axis of the drum.

[0020] Preferably, in the above external heat rotary equipment, an observation port, an ignition port, a gas inlet and outlet, and a waste outlet are provided on the cylinder body of the combustion cylinder.

[0021] Preferably, in the above external heat rotary equipment, the two ends of the combustion cylinder are connected by contact friction type rotational sealing with the outer cylinder wall of the drum.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] In the externally heated rotary device provided by the present invention, a combustion cylinder seal is sleeved on the outer periphery of the drum, and the drum rotates relative to the fixedly arranged combustion cylinder; a material lifting plate located inside the combustion cylinder is further arranged on the outer wall of the drum. Since the combustion cylinder is stationary, the energy substance inside the combustion cylinder accumulates at the bottom of the combustion cylinder, and the energy substance cannot burn fully, resulting in a low combustion efficiency, slow heat generation, and inability to meet the heating requirements of the materials inside the drum. Therefore, a material lifting plate is arranged on the outer wall of the drum. During the rotation of the drum, the material lifting plate raises the energy substance accumulated at the bottom of the combustion cylinder, causing the energy substance to burn diffusely inside the combustion cylinder, accelerating the combustion speed, increasing the combustion range, enabling the energy substance to burn fully, saving energy consumption, generating heat that can meet the heating requirements, and improving the combustion efficiency of the energy substance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0025] Figure 1 The front view schematic diagram of an externally heated rotary device provided by an embodiment of the present invention;

[0026] Figure 2 The structural schematic diagram of the material lifting plate of an externally heated rotary device provided by an embodiment of the present invention;

[0027] Figure 3 The front view schematic diagram of another externally heated rotary device provided by an embodiment of the present invention;

[0028] Figure 4 For Figure 3 the structural schematic diagram of the cross-section of the externally heated rotary device in

[0029] Figure 5 The structural schematic diagram of the barrel wall of the drum of an externally heated rotary device provided by an embodiment of the present invention;

[0030] Figure 6 The axial sectional structural schematic diagram of an externally heated rotary device provided by an embodiment of the present invention;

[0031] Figure 7 The side view schematic diagram of the combustion cylinder of an externally heated rotary device provided by an embodiment of the present invention.

[0032] Among them, 1 is a drum, 2 is a combustion chamber, 21 is a gas inlet and outlet, 22 is an observation port, 23 is an ignition port, 24 is a waste outlet, 3 is a gas communication cavity, 4 is a communication hole, 5 is a spiral material channel, 6 is a material lifting plate, 61 is a bending part, and 62 is a material leakage notch. Detailed implementation mode

[0033] The core of the present invention is to provide an externally heated rotary device, which improves the combustion efficiency of the combustion chamber.

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0035] Please refer to Figure 1 - Figure 2 , the embodiment of the present invention provides an externally heated rotary device, including a drum 1 and a combustion chamber 2. The combustion chamber 2 is hermetically sleeved on the outer periphery of the drum 1, and the drum 1 rotates relative to the fixedly arranged combustion chamber 2; the externally heated rotary device further includes a material lifting plate 6 arranged on the outer wall of the drum 1 and located inside the combustion chamber 2.

[0036] Since the combustion chamber 2 is fixed and immovable, the energy substance in the combustion chamber 2 accumulates at the bottom of the combustion chamber 2, and the energy substance cannot burn fully, resulting in a low combustion efficiency, slow heat generation, and inability to meet the heating requirements of the material in the drum 1. Therefore, a material lifting plate 6 is arranged on the outer wall of the drum 1. During the rotation of the drum 1, the material lifting plate 6 rotates with the drum 1. The material lifting plate 6 raises the energy substance accumulated at the bottom of the combustion chamber 2, enabling the energy substance to diffuse and burn in the combustion chamber 2, accelerating the combustion speed, increasing the combustion range, enabling the energy substance to burn fully, saving energy consumption, generating heat that can meet the heating requirements, and improving the combustion efficiency of the energy substance.

[0037] Furthermore, in this embodiment, the number of the material lifting plates 6 is multiple, and they are distributed along the axial and circumferential directions of the drum 1 to continuously raise and sprinkle the energy substance in the combustion chamber 2, enabling it to burn fully. More preferably, the material lifting plates 6 are evenly distributed on the outer wall of the drum 1, so that the combustion is more uniform and the heat distribution is more uniform.

[0038] Even further, in this embodiment, the rotating surfaces formed by the ends of all the material lifting plates 6 are continuous and unbroken in the axial direction of the drum 1, so as to raise all the energy substances at the bottom of the combustion chamber 2 without omission, enabling more complete combustion and avoiding energy waste.

[0039] In this embodiment, the material lifting surface of the material lifting plate 6 is parallel or inclined to the axial direction of the drum 1. With such a setting, the material turning area of the material lifting surface of the material lifting plate 6 is increased, and the materials at the bottom of the combustion cylinder 2 can be lifted and scattered more and more conveniently. The inclined material lifting plate 6 can also scatter and transfer the energy material along the axial direction, so as to facilitate the transfer of the energy material in the combustion cylinder 2 from the inlet end to the outlet end of the combustion cylinder 2.

[0040] Further, the material lifting surface of the material lifting plate 6 is inclined towards the feeding end of the drum 1, so that the transfer direction of the energy material in the combustion cylinder 2 is opposite to the moving direction of the materials in the drum 1. That is, the positions of the inlet end and the outlet end of the combustion cylinder 2 are reversed with the positions of the feeding end and the discharging end of the drum 1. With such a setting, it is ensured that the heat generated by the combustion of the energy material in the combustion cylinder 2 is balanced with the heat absorbed by the materials in the drum 1, and the utilization rate of heat is improved. Of course, the material lifting surface of the material lifting plate 6 can also be inclined towards the discharging end of the drum 1, but the heat utilization rate is not as good as the situation listed in this embodiment.

[0041] In this embodiment, the material lifting plate 6 extends along the radial direction of the drum 1. With such a setting, the length of the material lifting plate 6 can be reduced.

[0042] As Figure 2 shown, this embodiment provides a specific material lifting plate 6. The end of the material lifting plate 6 is a bent portion 61 bent along the rotation direction of the drum 1. It is easier to lift the energy material accumulated at the bottom of the combustion cylinder 2 through the bent portion 61, and the energy material stays in the bent portion 61 briefly, which is beneficial to lifting and scattering. Of course, the material lifting plate 6 can also be a straight plate or an arc-shaped plate. The inner arc surface of the arc-shaped plate faces the same direction as the rotation direction of the drum. The material lifting plate 6 is not limited to the structural form listed in this embodiment.

[0043] Further, in this embodiment, a material leakage notch 62 is provided on the bent portion 61 of the material lifting plate 6. The number of the material leakage notches 62 can be one, two or more. The material leakage notch 62 is similar to a finger gap. After the energy material is lifted by the bent portion 61 of the material lifting plate 6, the energy material is scattered and lifted through the material leakage notch 62 during the rising process of the material lifting plate 6, so that the energy material is more evenly diffused and fully burned.

[0044] As Figure 3 - Figure 6 shown, in this embodiment, the externally heated rotary device further includes a gas communication cavity 3 arranged in the drum 1 and isolated from the inside of the drum 1. The gas communication cavity 3 is communicated with the combustion cylinder 2 through a communication hole 4 arranged on the cylinder wall of the drum 1, and is used to introduce the heating gas of the combustion cylinder 2 into the gas communication cavity 3. The cavity wall of the gas communication cavity 3 is used for heat transfer with the materials in the drum 1.

[0045] The working process of this externally heated rotary device is as follows: Materials enter the drum 1. As the drum 1 rotates, to ensure the reaction effect of the materials, the drum 1 rotates slowly. The materials slide along the inner wall of the drum 1. During this process, the heat in the combustion chamber 2 is transferred to the inside of the drum 1 through the wall of the drum 1. The materials contact and transfer heat with the wall of the drum 1 during the sliding process. At the same time, the heating gas in the combustion chamber 2 is introduced into the gas communication cavity 3, and it contacts and transfers heat with the materials through the wall of the gas communication cavity 3, and radiates heat to the inside of the drum 1 through the wall of the gas communication cavity 3. Compared with the existing method of only heating the materials in the drum 1 through the wall of the drum 1, in this application, the heat transfer area inside the drum 1 is greatly increased through the wall of the gas communication cavity 3, improving the heat transfer efficiency and the utilization rate of thermal energy, and saving the material reaction time. At the same time, the material lifting plate 6 can play a role in disturbing the air flow, enabling the gas to enter the gas communication cavity 3 and generating irregular convection motion, so that the heating gas enters the gas communication cavity 3 more evenly.

[0046] In this embodiment, at least one communication hole 4 is provided between two adjacent material lifting plates 6 in the circumferential direction, which is used to disturb the heating gas in the combustion chamber 2, so that the heating gas enters the gas communication cavity 3 and generates irregular convection. The communication hole 4 can enable the heating gas in the combustion chamber 2 to enter the gas communication cavity 3, and minimize or avoid the solid or liquid materials in the combustion chamber 2 from entering the gas communication cavity 3 through the communication hole 4.

[0047] In this embodiment, the gas communication cavity 3 is a continuous cavity structure or a plurality of separate cavity structures. A continuous cavity structure is in gas communication with the combustion chamber 2, or a plurality of separate cavity structures are respectively in gas communication with the combustion chamber 2, as long as the heating gas in the combustion chamber 2 can be introduced into the gas communication cavity 3, so as to increase the heat transfer area inside the drum 1 and realize the multi-directional heating of the materials.

[0048] Regardless of whether the gas communication cavity 3 is a continuous cavity structure or a plurality of separate cavity structures, the shape and size of its cavity structure are not limited, and it can be of any shape, such as a strip-shaped cavity structure, a block-shaped cavity structure, a special-shaped cavity structure, etc. It can also be arbitrarily arranged inside the drum 1, such as arranged along the axial direction, transverse direction, etc. of the drum 1, as long as it is ensured that the materials can flow inside the drum 1 and transfer heat through the cavity structure.

[0049] Of course, this embodiment does not limit the shape, size and number of the connecting holes 4. The connecting holes 4 can be of any shape, such as circular, rectangular, elliptical, plum blossom, etc., as long as it is conducive to the passage of gas. The size of the connecting holes 4 is determined according to the heating demand. If the heating demand is large, a larger connecting hole 4 can be set to ensure sufficient circulation of heating gas. On the contrary, a smaller connecting hole 4 is set. The number of connecting holes 4 is also set according to the heating demand. The more the number of connecting holes 4, the smoother the circulation of the heating gas in the gas communication cavity 3, and the faster the heating speed. On the contrary, the slower the heating speed, but at the same time, it is necessary to ensure that the solid and liquid materials in the combustion tube 2 are prevented from entering the gas communication cavity 3 as much as possible.

[0050] Furthermore, in this embodiment, one side cavity wall of the gas communication cavity 3 is fitted and fixed with or shared with the inner wall of the drum 1, that is, the gas communication cavity 3 is located and fixed on the inner wall of the drum 1, and the one side cavity wall of the gas communication cavity 3 for being located can be an independent cavity wall, or can be shared with the inner wall of the drum 1. The communication hole 4 is provided on the cylinder wall where the gas communication cavity 3 and the drum 1 are fitted or shared, and the gas communication cavity 3 and the combustion cylinder 2 maintain gas communication through the communication hole 4. By fixing the gas communication cavity 3 on the cylinder wall of the drum 1, the material in the drum 1 can increase the chance of contacting and transferring heat with the cavity wall of the gas communication cavity 3 during the process of sliding down along the cylinder wall in the drum 1, slowing down the speed of material movement, thereby further improving the heat transfer efficiency.

[0051] Of course, the gas communication cavity 3 can also be suspended in the drum 1, and the cavity wall of the gas communication cavity 3 does not contact the inner wall of the drum 1, but is suspended and fixed by a supporting structure. Accordingly, the gas communication cavity 3 is connected to the connecting hole 4 on the wall of the drum 1 through a connecting pipe to achieve gas communication. In this way, the material may rarely contact the cavity wall of the gas communication cavity 3 during the movement of the drum 1, but the heat radiation heating is carried out through the cavity wall of the gas communication cavity 3, which can also improve the heat transfer efficiency.

[0052] like Figure 4 and Figure 6As shown in the figure, further, in this embodiment, the gas communication cavity 3 is preferably one or more sets of spiral structure cavities. The spiral structure cavities extend spirally along the axial direction of the drum 1. The side wall of the spiral structure cavity and the barrel wall of the drum 1 form a spiral material channel 5. Multiple sets of spiral structure cavities are arranged in sequence along the axial direction of the drum 1 to form a continuous spiral material channel 5. A spiral gas channel is formed inside the spiral structure cavity. After such a setting, the spiral structure cavity can make full use of the space inside the drum 1, providing radial and axial heat convection, heat conduction, and heat radiation channels between the drum 1 and the combustion cylinder 2, greatly increasing the heat transfer area. During operation, after the material enters the drum 1 from the feed end of the drum 1, as the drum 1 rotates, the material gradually moves from the feed end of the drum 1 to the discharge end in the spiral material channel 5. The material is driven by the rotating spiral structure cavity to move backward automatically. Therefore, the drum 1 can be placed horizontally without the need to incline the feed end higher than the discharge end. During the movement of the material in the spiral material channel 5, the material is always in contact with the side wall of the spiral structure cavity and the barrel wall of the drum 1 for heat transfer, and the running path of the material is extended, increasing the residence time of the material in the drum 1, fully heating the material, further improving the heat transfer efficiency, and being more conducive to the progress of the material reaction.

[0053] Of course, if the gas communication cavity 3 does not adopt a spiral structure cavity, in order to facilitate the movement of the material from the feed end to the discharge end, the feed end of the drum 1 is inclined higher than the discharge end, and the self-weight of the material and the rotation of the drum 1 are used to realize the automatic movement of the material.

[0054] As Figure 5 shown in the figure, further, in this embodiment, one or more communication holes 4 are opened on the barrel wall where the spiral structure cavity is attached to or shared with the drum 1. The multiple communication holes 4 are arranged along the spiral direction. If one communication hole 4 is provided, the heated gas with a certain pressure in the combustion cylinder 2 enters the spiral structure cavity through this communication hole 4. In order to make the heated gas fill the spiral structure cavity, one communication hole 4 is arranged at one end of the spiral structure cavity, and the heated gas gradually fills the entire cavity from one end of the spiral structure cavity. The communication hole 4 is preferably arranged at one end of the spiral structure cavity close to the discharge end, so that the flow direction of the heated gas is opposite to the movement direction of the material, to further improve the heat transfer efficiency. If multiple communication holes 4 are provided, the multiple communication holes 4 are arranged along the spiral direction of the spiral structure cavity. Preferably, the multiple communication holes 4 are evenly distributed to further improve the uniformity of gas heat transfer.

[0055] Further, in this embodiment, the spiral structure cavity is an annular spiral structure cavity, and there is a radial distance between the inner circle of the annular spiral structure cavity and the axis of the drum 1. With such a setting, a hollow area running through the axial direction of the drum 1 is formed in the central part of the annular spiral structure cavity, and the gas generated by the reaction inside the drum 1 can flow more smoothly through the hollow area.

[0056] Of course, the spiral-structured cavity may not have a hollow region, and the gas generated by the reaction inside the drum 1 can still be spirally conveyed in the spiral material channel 5, except that the gas conveyance path is relatively long.

[0057] As an optimization, in this embodiment, the difference between the outer diameter and the inner diameter of the annular spiral-structured cavity is greater than 5 cm. The difference between the outer diameter and the inner diameter of the annular spiral-structured cavity is determined according to the heating requirement and the gas conveyance requirement inside the drum 1. The determination of the difference needs to ensure the temperature difference between the combustion cylinder 2 and the drum 1, so that the material can fully react while avoiding rapid coking.

[0058] As an optimization, in this embodiment, the width between the two side walls of the spiral-structured cavity is 1 cm to 100 cm. The size of the width determines the size of the gas spiral channel inside the spiral-structured cavity, and further determines the heating amount, the heat dissipation area, and ensures the generation of convection and turbulence of the hot air flow. More preferably, the width between the two side walls is about 50 cm.

[0059] In this embodiment, the pitch of the spiral-structured cavity is an equal pitch or a variable pitch, and the pitch is greater than 1 cm. The pitch form and the pitch size are determined according to the temperature gradient and the carbonization requirement in different axial segments inside the drum 1.

[0060] As Figure 7 shown, the combustion cylinder 2 is optimized. In this embodiment, an observation port 22, an ignition port 23, a gas inlet / outlet 21, and a waste outlet 24 are provided on the cylinder body of the combustion cylinder 2. The combustion cylinder 2 is used for burning energy substances, such as liquid energy substances, solid energy substances, etc. The generated heating gas enters the gas communication cavity 3 through the communication holes 4 on the cylinder wall of the drum 1, and the waste remaining after combustion is discharged from the waste outlet 24 of the combustion cylinder. The gas inlet / outlet 21 is used for discharging the gas inside the combustion cylinder and allowing the external gas to enter. The ignition port 23 is used for igniting the energy substance inside the combustion cylinder. The observation port 22 is used for observing the combustion condition inside the combustion cylinder.

[0061] In this embodiment, the external heat rotary device further includes a temperature sensor and / or a pressure sensor disposed in the combustion cylinder 2 and / or the drum 1. The temperature in the combustion cylinder 2 and / or the drum 1 is detected by the temperature sensor, and the pressure in the combustion cylinder 2 and / or the drum 1 is detected by the pressure sensor. Then, the reaction is manually or automatically controlled according to the detected temperature and pressure.

[0062] In this embodiment, the drum 1 is driven to rotate by a driving device. The driving device mainly includes a motor, a reducer, a gear ring, a supporting roller and a rotating ring. The rotating ring is preferably arranged on the outer circumferences at both ends of the drum 1. The rotating ring is rotationally supported by the supporting roller below. The motor is decelerated by the reducer and then cooperates with the gear ring. The gear ring is fixed on the outer circumference of one end of the drum 1. By driving the gear ring to rotate with the motor, the drum 1 is driven to rotate. Of course, the driving device can also be in other structural forms and is not limited to the form listed in this embodiment.

[0063] In this embodiment, a contact friction type rotational sealing connection is adopted between the two ends of the combustion cylinder 2 and the outer cylinder wall of the drum 1. Since the drum 1 rotates slowly, a rotational sealing connection between the combustion cylinder 2 and the drum 1 can be achieved through a simple rotational structure. To improve the structural strength of the rotational sealing part, the wall thickness of the drum 1 is increased at the position where it contacts and rubs against the combustion cylinder 2. Of course, the combustion cylinder 2 and the drum 1 can also be rotationally sealed through other rotational sealing structures.

[0064] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An externally heated rotary device, comprising a drum (1) and a combustion cylinder (2), wherein the combustion cylinder (2) is sealingly sleeved on the outer periphery of the drum (1), and the drum (1) rotates relative to the relatively fixed combustion cylinder (2); characterized in that, It further includes a material lifting plate (6) disposed on the outer wall of the drum (1) and located inside the combustion cylinder (2). It further includes a gas communication cavity (3) disposed inside the drum (1) and isolated from the interior of the drum (1). The gas communication cavity (3) communicates with the combustion cylinder (2) and is used to introduce the heating gas in the combustion cylinder (2) into the gas communication cavity (3). The cavity wall of the gas communication cavity (3) is used for heat transfer with the materials inside the drum (1). The gas communication cavity (3) is a set of one or more spiral structure cavities. The spiral structure cavities extend spirally along the axial direction of the drum (1). The side wall of the spiral structure cavity and the barrel wall of the drum (1) form a spiral material channel (5). One or more communication holes (4) are opened on the barrel wall of the spiral structure cavity that fits with the drum (1), or one or more communication holes (4) are opened on the barrel wall shared by the spiral structure cavity and the drum (1). The multiple communication holes (4) are arranged along the spiral direction.

2. The externally heated rotary device according to claim 1, characterized in that, The material lifting plates (6) are distributed along the axial and circumferential directions of the drum (1).

3. The externally heated rotary device according to claim 2, characterized in that, The rotating surfaces formed by the rotation of the ends of the multiple material lifting plates (6) are continuous in the axial direction of the drum (1).

4. The externally heated rotary device according to claim 1, characterized in that, The material lifting surface of the material lifting plate (6) is parallel or inclined to the axial direction of the drum (1).

5. The externally heated rotary device according to claim 4, characterized in that, The material lifting surface of the material lifting plate (6) is inclined towards the feed end of the drum (1), so that the transfer direction of the energy material in the combustion cylinder (2) is opposite to the moving direction of the materials in the drum (1).

6. The externally heated rotary device according to claim 1, characterized in that, The end of the material lifting plate (6) is a bent portion (61) bent along the rotation direction of the drum (1).

7. The externally heated rotary device according to claim 6, characterized in that, A material leakage notch (62) is provided on the bent portion (61) of the material lifting plate (6).

8. The externally heated rotary device according to claim 1, characterized in that, At least one of the communication holes (4) is provided between two adjacent material lifting plates (6) in the circumferential direction, for disturbing the heating gas in the combustion cylinder (2), so that the heating gas enters the gas communication cavity (3) and generates irregular convection.

9. The externally heated rotary device according to claim 1, characterized in that, The gas communication cavity (3) is a continuous cavity structure or a plurality of separate cavity structures.

10. The externally heated rotary device according to claim 1, characterized in that, The spiral structure cavity is an annular spiral structure cavity, and there is a radial distance between the inner circle of the annular spiral structure cavity and the axis of the drum (1).

11. The externally heated rotary device according to claim 1, characterized in that, An observation port (22), an ignition port (23), a gas inlet / outlet (21) and a waste outlet (24) are provided on the barrel of the combustion cylinder (2).

12. The externally heated rotary device according to claim 1, characterized in that, Both ends of the combustion cylinder (2) and the outer barrel wall of the drum (1) are connected by a contact friction type rotational seal.

Images