Dry distillation equipment

Abstract

The utility model provides destructive distillation equipment. The destructive distillation equipment comprises a barrel body, a returned material conveying device, an external heating device, a feeding device and a discharging device, the barrel conveys materials in the barrel in a rotating mode in a first conveying direction, the first conveying direction is from the feeding port to the discharging port, and the barrel is provided with a heat storage type dry distillation area adjacent to the feeding port and an external heating type dry distillation area adjacent to the discharging port; the returned material conveying device is arranged in the barrel body and can convey part of materials in the second conveying direction, and the second conveying direction is from the discharging opening to the feeding opening; the external heating device is arranged on the periphery of the external heating type dry distillation area; the feeding device and the discharging device are respectively arranged at the feeding hole and the discharging hole; according to the dry distillation equipment, high-temperature carbon powder is conveyed to the heat storage type dry distillation area through the returned material conveying device, so that the high-temperature carbon powder and coal tar residues are mixed, then the mixed material is conveyed to the external heating type dry distillation area through the barrel, the coal tar residues are subjected to dry distillation treatment to generate carbon powder, one part of the carbon powder is discharged, and the other part of the carbon powder is conveyed by the returned material conveying device.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge treatment, in particular to a dry distillation device. Background Art

[0002] During the coal gasification or coking process, high-boiling organic compounds generated under high temperature conditions are mixed with coal powder and solid particles entrained in the coal gas during condensation to form coal tar residue. In addition to various substances such as benzene, phenols, and naphthalene, coal tar residue also contains various organic compounds such as benzo(a)pyrene that are carcinogenic to organisms, which is very harmful. Nevertheless, coal tar residue contains a large amount of fixed carbon and organic volatile components, has a high calorific value, and has relatively low ash and sulfur content. If used reasonably, it is a high-value secondary energy source.

[0003] At present, the commonly used treatment solutions for coal tar residue are solvent extraction, blending, coal blending, etc. The investment and operation costs of the solvent extraction solution are high, and the operation is complicated. In addition, with the improvement of national environmental protection requirements, blending and blending of tar residue are no longer allowed. In view of this, the industry gradually adopts external heat rotary kiln type dry distillation equipment to pyrolyze or dry distill coal tar residue to recover the oil and carbon powder in the coal tar residue, and realize the resource reuse of coal tar residue.

[0004] However, due to the high content of heavy components and high viscosity of coal tar residue, it is very easy to adhere to the inner wall of the equipment in externally heated rotary kilns and other equipment to form coke. If this coke cannot be removed in time, the coke layer on the wall of the rotary kiln will gradually accumulate, greatly reducing the heat transfer coefficient of the rotary kiln. At the same time, it will also cause corrosion to the metal shell of the rotary kiln, affecting the processing efficiency and service life of related equipment. Utility Model Content

[0005] A main purpose of the utility model is to overcome at least one defect of the above-mentioned prior art and provide a dry distillation device which can effectively solve the problem of coking on the inner wall of the device.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] According to one aspect of the utility model, a dry distillation device is provided for dry distilling coal tar residue, wherein the dry distillation device comprises a cylinder, a return material conveying device, an external heating device, a feeding device and a discharging device; the cylinder can rotate along its own axis and the axis extends in the horizontal direction, and the cylinder openings at both ends of the cylinder in the axial direction are respectively a feeding port and a discharging port, and the cylinder is configured to convey the material inside it in a rotating manner along a first conveying direction, and the first conveying direction is from the feeding port to the discharging port, and the cylinder has a heat storage type dry distillation zone and an external heating type dry distillation zone arranged in the axial direction, the heat storage type dry distillation zone is adjacent to the feeding port, and the external heating type dry distillation zone is adjacent to the discharging port; the return material conveying device is arranged at the cylinder. The cylinder is configured to transport part of the material along a second transport direction, wherein the second transport direction is from the discharge port to the feed port; the external heating device is arranged at the periphery of the external heating type retorting zone; the feed device and the discharge device are respectively arranged at the feed port and the discharge port; wherein the retorting equipment is configured to: utilize the return material conveying device to convey the high-temperature carbon powder to the heat storage type retorting zone, so that the high-temperature carbon powder is mixed with the coal tar residue fed by the feed device to generate retorting gas, and then utilize the cylinder to convey the mixed material to the external heating type retorting zone, and retort the coal tar residue to generate carbon powder, and the retorting gas and part of the carbon powder are discharged by the discharge device, and the other part of the carbon powder is conveyed by the return material conveying device.

[0008] According to one embodiment of the present invention, the return material conveying device is a screw conveyor, which is rotatably arranged in the cylinder along its own axis, and the screw conveyor is parallel to the axis of the cylinder and rotates in opposite directions.

[0009] According to one embodiment of the present invention, the axis of the screw conveyor coincides with the axis of the cylinder.

[0010] According to one embodiment of the present invention, the outer diameter of the screw conveyor accounts for 1 / 10 to 1 / 2 of the inner diameter of the barrel.

[0011] According to one embodiment of the present invention, along the axial direction, the ratio of the length of the regenerative retort zone to the length of the external heating retort zone is 1:8 to 1:1.

[0012] According to one embodiment of the present invention, the external heating device includes at least two heating units, at least two of the heating units are arranged along the axial direction, and the heating intensity of each heating unit is not completely the same.

[0013] According to one of the embodiments of the present invention, wherein: the external heating device includes at least four heating units; and / or, along the first conveying direction, the heating intensity of at least two of the heating units increases gradually.

[0014] According to one embodiment of the present invention, the external heating device is a high-temperature flue gas heating device, a flame heating device or an electric heating device.

[0015] According to one embodiment of the utility model, the inner wall of the cylinder in the regenerative distillation zone is coated with a high temperature resistant, wear resistant, heat insulating and anti-coking coating layer.

[0016] According to one embodiment of the present utility model, the material of the high temperature resistant, wear resistant, heat insulating and anti-coking coating layer is silicate, zirconium oxide or aluminum oxide.

[0017] It can be seen from the above technical scheme that the advantages and positive effects of the dry distillation equipment proposed by the utility model are:

[0018] The dry distillation equipment proposed in the utility model is provided with a return material conveying device in the cylinder, and the second conveying direction of the return material conveying device is opposite to the first conveying direction of the cylinder, and the first conveying direction is from the feed port of the cylinder to the discharge port. In addition, the cylinder has a heat storage type dry distillation zone adjacent to the feed port and an external heating type dry distillation zone adjacent to the discharge port, and the cylinder is only provided with an external heating device on the periphery of its external heating type dry distillation zone. Accordingly, the dry distillation equipment uses the return material conveying device to convey the high-temperature carbon powder to the heat storage type dry distillation zone, so that the high-temperature carbon powder is mixed with the coal tar residue and produces dry distillation gas, and then uses the cylinder to convey the mixed material to the external heating type dry distillation zone, and the coal tar residue is dry-distilled to produce carbon powder, a part of the carbon powder is discharged, and the other part of the carbon powder is conveyed by the return material conveying device. Through the above design, the utility model uses the return material conveying device to convey the high-temperature carbon powder to the heat storage type dry distillation zone of the cylinder, and the carbon powder is mixed with the coal tar residue through the rotation of the cylinder as a heat storage body, so that the coal tar residue can be quickly dispersed and heated. In addition, by placing the cylinder body in a regenerative retort zone without an external heating device, the carbon powder as a regenerative body is mixed with the coal tar residue in the regenerative regenerative zone. Compared with the heat source of external heating, the high-temperature energy carried by the carbon powder is more uniform and gentle, thereby effectively avoiding the coking problem caused by excessive local temperature. Furthermore, when the carbon powder is transported to the feed port of the cylinder body through the return material conveying device, a carbon powder layer with a certain thickness can be formed in the cylinder body, thereby making it difficult for the coal tar residue to penetrate the carbon powder layer even if partial coking occurs after entering the cylinder body, thereby effectively avoiding the coking of the cylinder body, thereby ensuring that the flow performance of the material in the cylinder body is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The various objects, features and advantages of the present invention will become more apparent by considering the following detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. The accompanying drawings are only exemplary illustrations of the present invention and are not necessarily drawn to scale. In the accompanying drawings, the same reference numerals always represent the same or similar parts. Among them:

[0020] Figure 1 is a schematic structural diagram of a dry distillation device according to an exemplary embodiment;

[0021] Figure 2 yes Figure 1 A schematic cross-sectional view of the dry distillation device at the feed inlet of the cylinder is shown;

[0022] Figure 3 yes Figure 1 The process flow diagram of the dry distillation equipment is shown.

[0023] The following are the descriptions of the reference numerals:

[0024] 100. Cylinder;

[0025] 101. Regenerative distillation zone;

[0026] 102. Externally heated retorting zone;

[0027] 200. Return material conveying device;

[0028] 300. External heating device;

[0029] 310. Heating unit;

[0030] 400. Feeding device;

[0031] 410. Feed conveying device;

[0032] 500. Discharging device;

[0033] A. Carbon powder layer;

[0034] F1. The first conveying direction;

[0035] F2. Second conveying direction;

[0036] F3. Rotation direction;

[0037] F4. Casting direction;

[0038] H. Thickness. DETAILED DESCRIPTION

[0039] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and drawings therein are essentially for illustrative purposes rather than for limiting the present invention.

[0040] In the following description of different exemplary embodiments of the utility model, reference is made to the accompanying drawings, which form a part of the utility model and in which different exemplary structures, systems and steps that can implement multiple aspects of the utility model are shown by way of example. It should be understood that other specific schemes of components, structures, exemplary devices, systems and steps can be used, and structural and functional modifications can be made without departing from the scope of the utility model. Moreover, although the terms "above", "between", "within", etc. can be used in this specification to describe different exemplary features and elements of the utility model, these terms are used herein only for convenience, such as according to the direction of the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of the utility model.

[0041] See also Figure 1 , which representatively shows a schematic diagram of the structure of the dry distillation equipment proposed in the utility model, wherein the cylinder 100 is shown in perspective for ease of understanding and explanation. In this exemplary embodiment, the dry distillation equipment proposed in the utility model is described by taking the application of dry distillation treatment of coal tar residues produced in the coal gasification or coking process as an example. It is easy for those skilled in the art to understand that in order to apply the relevant design of the utility model to the dry distillation treatment of coal tar residues produced in other sludge treatment processes, various modifications, additions, substitutions, deletions or other changes are made to the specific embodiments described below, and these changes are still within the scope of the principle of the dry distillation equipment proposed in the utility model.

[0042] like Figure 1 As shown, in one embodiment of the present invention, the dry distillation equipment proposed in the present invention is used to perform dry distillation treatment on coal tar residue, and the dry distillation equipment includes a cylinder 100, a return material conveying device 200, an external heating device 300, a feeding device 400 and a discharging device 500. Figure 2 and Figure 3 , Figure 2 , a cross-sectional schematic diagram of a dry distillation device at a feed inlet of a cylinder 100 that can embody the principle of the utility model is representatively shown; Figure 3 The process flow chart of the dry distillation equipment that can embody the principle of the utility model is representatively shown in FIG. The structure, connection mode and functional relationship of each main component of the dry distillation equipment proposed by the utility model will be described in detail below in conjunction with the above-mentioned drawings.

[0043] like Figures 1 to 3As shown, in one embodiment of the utility model, the cylinder 100 can rotate along its own axis and the axis extends in the horizontal direction. The two ends of the cylinder 100 in the axial direction are the feed port and the discharge port, respectively. The cylinder 100 can convey the material inside it (for example, a mixture of coal tar residue and carbon powder as a heat carrier) in a rotating manner along the first conveying direction F1, and the first conveying direction F1 is from the feed port to the discharge port. Among them, the cylinder 100 has a regenerative retort zone 101 and an external heating retort zone 102 arranged in the axial direction, the regenerative retort zone 101 is adjacent to the feed port, and the external heating retort zone 102 is adjacent to the discharge port. The return material conveying device 200 is arranged in the cylinder 100, and the return material conveying device 200 can convey part of the material (for example, carbon powder) along the second conveying direction F2, and the second conveying direction F2 is from the discharge port to the feed port, that is, the return material conveying device 200 is opposite to the conveying direction of the cylinder 100. The external heating device 300 is arranged on the periphery of the external heating type retorting zone 102 of the cylinder 100. The external heating device 300 heats the cylinder 100 and the interior of the external heating type retorting zone 102 in the form of an external heat source, so that the temperature of the material in the cylinder 100 is further increased, so that the tar in the coal tar residue can be fully pyrolyzed and completely evaporated, and finally the whole retorting process is completed. The feeding device 400 is arranged at the feeding port of the cylinder 100 for inputting materials, and the discharging device 500 is arranged at the discharging port of the cylinder 100 for discharging the materials (carbon powder) and the retorting gas generated after the treatment. Accordingly, the retorting equipment proposed in the utility model can use the return material conveying device 200 to convey the high-temperature carbon powder to the heat storage type retorting zone 101, so that the high-temperature carbon powder is mixed with the coal tar residue fed by the feeding device 400, and accordingly, the coal tar residue can be rapidly heated and heated, so that the water in the coal tar residue evaporates and the retorting gas is pyrolyzed. Then, the cylinder 100 is used to transport the mixed material to the external heating type retorting area 102, and the coal tar slag is retorted into carbon powder. The retorting gas and a part of the carbon powder are discharged by the discharging device 500, and the other part of the carbon powder is transported by the return material conveying device 200. It should be noted that before the retorting device starts working, an appropriate amount of carbon powder can be added to the cylinder 100 through the feeding device 400 to be suitable for the material circulation after starting work. After the retorting device starts working, the mixed material (coal tar slag and part of the carbon powder) and part of the carbon powder can be transported in both directions through the cylinder 100 and the return material conveying device 200, so as to realize continuous retorting treatment by circulation. Through the above design, the utility model uses the return material conveying device 200 to transport the high-temperature carbon powder to the heat storage type retorting area 101 of the cylinder 100, and the carbon powder is mixed with the coal tar slag through the cylinder 100 as a heat storage body, so that the coal tar slag can be quickly dispersed and heated.Furthermore, by placing the cylinder 100 in the regenerative retort zone 101 without the external heating device 300, the carbon powder as the regenerative body is mixed with the coal tar residue in the regenerative retort zone 101. Compared with the heat source of external heating, the high temperature energy carried by the carbon powder is more uniform and gentle, thereby effectively avoiding the coking problem caused by excessive local temperature. Furthermore, when the carbon powder is transported to the feed port of the cylinder 100 via the return material conveying device 200, a carbon powder layer A with a certain thickness can be formed in the cylinder 100, thereby making it difficult for the coal tar residue to penetrate the carbon powder layer A even if partial coking occurs after entering the cylinder 100, thereby effectively avoiding the coking of the cylinder 100, thereby ensuring that the flow performance of the material in the cylinder 100 is more stable.

[0044] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the return material conveying device 200 can be a screw conveyor, which is arranged in the cylinder 100 and can rotate along its own axis, and the screw conveyor is parallel to the axis of the cylinder 100 and rotates in the opposite direction. Through the above design, the present invention can use the screw conveyor to convey part of the carbon powder along the second conveying direction F2, thereby realizing a stable and uniform material conveying function. In addition, the present invention can realize the proportional distribution of the carbon powder conveyed by the screw conveyor and the carbon powder discharged by the discharging device 500 by associating the specifications of the screw conveyor (such as the outer diameter) with the specifications of the cylinder 100 (such as the inner diameter).

[0045] like Figure 1 and Figure 2 As shown, based on the design of the return material conveying device 200 using a screw conveyor, in one embodiment of the present invention, the axis of the screw conveyor can coincide with the axis of the cylinder 100. Through the above design, the present invention can make the screw conveyor convey carbon powder more stable and uniform.

[0046] like Figure 1As shown, based on the design of the return material conveying device 200 using a screw conveyor, in one embodiment of the present utility model, the outer diameter of the screw conveyor can account for 1 / 10 to 1 / 2 of the inner diameter of the cylinder 100, such as 1 / 10, 1 / 8, 1 / 5, 1 / 3, 2 / 5, 1 / 2, etc. Through the above design, the present utility model can avoid the outer diameter of the screw conveyor accounting for too large a proportion so that it conveys too much carbon powder, and can also avoid the outer diameter of the screw conveyor accounting for too small a proportion so that it conveys too little carbon powder, thereby ensuring that sufficient carbon powder is conveyed to the feed port to mix with coal tar residue, and improving the carbon powder output of the equipment (i.e., increasing the amount of carbon powder discharged by the measuring device), and improving the processing efficiency of the dry distillation equipment. In some embodiments, the outer diameter of the screw conveyor can account for less than 1 / 10 of the inner diameter of the cylinder 100, or can be greater than 1 / 2, such as 1 / 11, 11 / 20, etc., and is not limited to this embodiment.

[0047] like Figure 1 As shown, in one embodiment of the utility model, along the axial direction of the cylinder 100, the ratio of the length of the heat storage type retorting zone 101 to the length of the external heating type retorting zone 102 can be 1:8 to 1:1, such as 1:8, 1:6, 1:4, 1:2, 1:1, etc. Through the above design, the utility model can reasonably allocate the area range of the two different heating methods of the coal tar slag in the cylinder 100, and on the basis of using the external heating type retorting zone 102 to achieve sufficient retorting treatment of the coal tar slag, provide sufficient heat storage type retorting zone 101 to achieve sufficient mixing and heat storage of part of the carbon powder and the coal tar slag, and effectively avoid the occurrence of coking problems. In some embodiments, the ratio of the length of the heat storage type retorting zone 101 to the length of the external heating type retorting zone 102 can also be less than 1:8, or can be greater than 1:1, such as 1:9, 11:10, etc., and is not limited to this embodiment.

[0048] like Figure 1 As shown, based on the design that the ratio of the length of the regenerative retort zone 101 to the length of the externally heated retort zone 102 is 1:8 to 1:1, in one embodiment of the present invention, the ratio of the length of the regenerative retort zone 101 to the length of the externally heated retort zone 102 may preferably be 1:3.

[0049] In one embodiment of the present invention, the temperature of the carbon powder in the cylinder 100 can be 550℃~800℃, for example, 550℃, 600℃, 800℃, etc., and can be further preferably 600℃~750℃, for example, 600℃, 650℃, 700℃, 750℃, etc.

[0050] In one embodiment of the present invention, in the cylinder 100, the mass ratio of carbon powder to coal tar residue can be 2:1 to 10:1, for example, 2:1, 3:1, 9:1, 10:1, etc., and can further preferably be 4:1 to 8:1, for example, 4:1, 5:1, 7:1, 8:1, etc.

[0051] like Figure 2 As shown, in one embodiment of the present invention, the barrel 100 has a carbon powder layer A located at the bottom of the barrel cavity in the regenerative distillation zone 101 (for example, at the feed inlet), and the thickness H of the carbon powder layer A can be greater than or equal to 40 cm, for example, 40 cm, 55 cm, 60 cm, etc., and can further preferably be greater than or equal to 60 cm, for example, 60 cm, 65 cm, 70 cm, etc.

[0052] like Figure 2 As shown, in one embodiment of the present invention, the feed conveying device 410 of the feed device 400 can be located on one side of the return conveying device 200, and the casting direction F4 of the coal tar residue on the carbon powder layer A can be opposite to the rotation direction F3 of the cylinder 100. Accordingly, the present invention can further ensure that the coal tar residue is not easy to directly contact the inner wall of the cylinder 100.

[0053] In one embodiment of the present invention, the material of the barrel 100 may be metal, such as but not limited to 321H, 310S, etc.

[0054] like Figure 1 As shown, in one embodiment of the utility model, the external heating device 300 may include four heating units 310, which are arranged along the axial direction of the cylinder 100, and the heating intensity of each heating unit 310 is not exactly the same. Through the above design, the utility model can realize the partition heating of the external heating type retorting zone 102 of the cylinder 100 by the external heating device 300, thereby realizing different heating intensities, thereby achieving a better retorting treatment effect. In addition, the utility model can realize the length ratio adjustment of the heat storage type retorting zone 101 and the external heating type retorting zone 102 to a certain extent, thereby improving the stability and operational flexibility of the equipment. In some embodiments, when the external heating device 300 adopts a partition design, the number of heating units 310 included therein may also be one or more, that is, the external heating device 300 may include more than four heating units 310. In other embodiments, the external heating device 300 may also include only two or three heating units 310. Alternatively, the external heating device 300 may also adopt a non-partitioned design, that is, the external heating device 300 may adopt an overall heating intensity design for the external heating type retorting zone 102 of the barrel 100, which is not limited to the above-mentioned embodiment.

[0055] like Figure 1As shown, based on the design that the external heating device 300 includes four heating units 310 , in one embodiment of the present invention, along the first conveying direction F1 , the heating intensity of the four heating units 310 may be increased.

[0056] In one embodiment of the present invention, the external heating device 300 can be a high-temperature flue gas heating device, a flame heating device or an electric heating device. Since the cylinder 100 realizes the transportation of materials by rotating itself, the external heating device 300 can actually rotate relative to the cylinder 100.

[0057] In one embodiment of the present invention, the inner wall of the cylinder 100 may be coated with a high temperature resistant, wear resistant, heat insulating and anti-coking coating layer. Through the above design, the present invention can further protect and prevent the inner wall of the cylinder 100 from coking.

[0058] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the feeding device 400 may include a feeding conveying device 410, and the feeding conveying device 410 may be, for example, a screw conveyor.

[0059] Based on the design that the inner wall of the cylinder 100 in the regenerative distillation zone 101 is coated with a high-temperature resistant, wear-resistant, heat-insulating and anti-coking coating layer, in one embodiment of the utility model, the material of the high-temperature resistant, wear-resistant, heat-insulating and anti-coking coating layer can be silicate, zirconium oxide or aluminum oxide.

[0060] Based on the above detailed description of several exemplary embodiments of the dry distillation device proposed in the utility model, a specific embodiment of the dry distillation device proposed in the utility model will be briefly described below.

[0061] Related References Figure 3At room temperature, coal tar residue is a black viscous solid-liquid mixture, for example, containing 6% water, 60% tar, and 34% toluene insoluble matter. Coal tar residue is fed into the cylinder 100 by the feeding device 400, and the feeding amount of coal tar residue is 1 t / h. In the cylinder 100, the high-temperature carbon powder (for example, 650°C) near the discharge port is transported to one end of the feed port by the return material conveying device 200. The mass ratio of the carbon powder transported by the return material conveying device 200 to the coal tar residue can be 6:1, and the feeding amount of the carbon powder transported by the return material conveying device 200 is 6 t / h. The thickness H of the carbon powder layer A formed by the carbon powder at the feed port can be 80 cm. The coal tar residue and the high-temperature carbon powder are in direct contact with the regenerative retort zone 101 of the cylinder 100 and mixed with the rotation of the cylinder 100 (the rotation speed of the cylinder 100 can be 3 rpm). The coal tar residue is heated to 500°C in the regenerative retort zone 101, and the water and tar in the coal tar residue are evaporated. The residence time of the coal tar residue in the regenerative retort zone 101 can be 80 minutes, and then it enters the external heating retort zone 102 with the rotation of the cylinder 1001. The external heating retort zone 102 can be further divided into four heating zones, that is, the external heating device 300 includes four heating units 310. The residence time of the coal tar residue in the external heating retort zone 102 can be 240 minutes, and the residence time in the four external heating retort zones abcd is 60 minutes respectively. The temperatures of the four heating zones can be 540°C, 580°C, 620°C, and 650°C along the first conveying direction F1. The outside can be a high-temperature flue gas with a temperature of 800°C to 900°C. By controlling the flow rate of the flue gas entering the four heating zones, the temperature control of the four heating zones can be achieved respectively. After passing through the external heating dry distillation zone 102, the coal tar residue is finally completely pyrolyzed and dry distilled into carbon powder and dry distillation gas, and discharged through the discharging device 500. The generated dry distillation gas can be purified by distillation gas to finally obtain tar and coal gas products. In this embodiment, the production rate of carbon powder is about 0.45t / h, and the production rate of tar is about 0.38t / h. The operating pressure in the cylinder 100 can be -300Pa(G).

[0062] It should be noted that the retort devices shown in the drawings and described in this specification are only a few examples of the many types of retort devices that can adopt the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details or any components of the retort devices shown in the drawings or described in this specification.

[0063] In summary, the retorting device proposed in the utility model is provided with a return material conveying device 200 in the cylinder 100, and the second conveying direction F2 of the return material conveying device 200 is opposite to the first conveying direction F1 of the cylinder 100, and the first conveying direction F1 is from the feed port to the discharge port of the cylinder 100. In addition, the cylinder 100 has a regenerative retorting zone 101 adjacent to the feed port and an external heating retorting zone 102 adjacent to the discharge port, and the cylinder 100 is only provided with an external heating device 300 on the periphery of its external heating retorting zone 102. Accordingly, the retorting device uses the return material conveying device 200 to convey the high-temperature carbon powder to the regenerative retorting zone 101, so that the high-temperature carbon powder is mixed with the coal tar residue, and then uses the cylinder 100 to convey the mixed material to the external heating retorting zone 102, and the coal tar residue is retorted into carbon powder and retorting gas, a part of the carbon powder is discharged, and the other part of the carbon powder is conveyed by the return material conveying device 200. Through the above design, the utility model uses the return material conveying device 200 to convey the high-temperature carbon powder to the regenerative retort zone 101 of the cylinder 100. The carbon powder is used as a heat storage body and is mixed with the coal tar residue through the rotation of the cylinder 100, so that the coal tar residue can be quickly dispersed and heated. In addition, by pointing the cylinder 100 to the regenerative retort zone 101 without the external heating device 300, the carbon powder as a heat storage body is mixed with the coal tar residue in the regenerative retort zone 101. Compared with the heat source of external heating, the high-temperature energy carried by the carbon powder is evenly and gently increased, thereby effectively avoiding the coking problem caused by excessive local temperature. Furthermore, when the carbon powder is conveyed to the feed port of the cylinder 100 via the return conveying device 200, a carbon powder layer A with a certain thickness can be formed in the cylinder 100. Therefore, even if partial coking occurs after the coal tar residue enters the cylinder 100, it is difficult to penetrate the carbon powder layer A. Therefore, the cylinder 100 can be effectively prevented from coking, thereby ensuring that the flow performance of the material in the cylinder 100 is more stable.

[0064] The exemplary embodiments of the dry distillation equipment proposed by the utility model are described and / or illustrated in detail above. However, the embodiments of the utility model are not limited to the specific embodiments described here. On the contrary, the components and / or steps of each embodiment can be used independently and separately from other components and / or steps described here. Each component and / or each step of an embodiment can also be used in combination with other components and / or steps of other embodiments. When introducing the elements / components / etc. described and / or illustrated here, the terms "one", "one" and "above" are used to indicate the presence of one or more elements / components / etc. The terms "comprising", "including" and "having" are used to indicate the meaning of open inclusion and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc. In addition, the terms "first" and "second" in the claims and the specification are used only as marks and are not numerical restrictions on their objects.

[0065] Although the dry distillation apparatus of the present invention has been described according to different specific embodiments, those skilled in the art will recognize that the present invention can be implemented with modifications within the spirit and scope of the claims.

Claims

1. A dry distillation device for dry distilling coal tar residue, characterized in that: The dry distillation equipment comprises: The cylinder can rotate along its own axis and the axis extends in the horizontal direction. The two ends of the cylinder in the axial direction are respectively a feed port and a discharge port. The cylinder is configured to transport the material inside it in a rotating manner along a first conveying direction. The first conveying direction is from the feed port to the discharge port. The cylinder has a regenerative retort zone and an external heating retort zone arranged in the axial direction. The regenerative retort zone is adjacent to the feed port, and the external heating retort zone is adjacent to the discharge port. A material return conveying device is disposed in the cylinder and is configured to convey part of the material along a second conveying direction, wherein the second conveying direction is from the discharge port to the feed port; an external heating device, disposed on the periphery of the externally heated retorting zone; and A feeding device and a discharging device are respectively arranged at the feeding port and the discharging port; The dry distillation equipment is configured as follows: the high-temperature carbon powder is transported to the regenerative dry distillation zone by the return material conveying device, so that the high-temperature carbon powder is mixed with the coal tar residue fed by the feeding device to generate dry distillation gas, and then the mixed material is transported to the external heating dry distillation zone by the cylinder, and the coal tar residue is dry-distilled to generate carbon powder, the dry distillation gas and a part of the carbon powder are discharged by the discharging device, and the other part of the carbon powder is transported by the return material conveying device.

2. The dry distillation equipment according to claim 1, characterized in that The return material conveying device is a screw conveyor, which is rotatably arranged in the cylinder along its own axis, and the screw conveyor is parallel to the axis of the cylinder and rotates in the opposite direction.

3. The dry distillation equipment according to claim 2, characterized in that: The axis of the screw conveyor coincides with the axis of the cylinder.

4. The dry distillation equipment according to claim 2, characterized in that: The outer diameter of the screw conveyor accounts for 1 / 10 to 1 / 2 of the inner diameter of the barrel.

5. The dry distillation equipment according to claim 1, characterized in that: Along the axial direction, the ratio of the length of the regenerative retort zone to the length of the external heating retort zone is 1:8 to 1:

1.

6. The dry distillation equipment according to claim 1, characterized in that: The external heating device comprises at least two heating units, at least two of the heating units are arranged along the axial direction, and the heating intensities of the heating units are not completely the same.

7. The dry distillation equipment according to claim 6, characterized in that: The external heating device comprises at least four heating units; and / or Along the first conveying direction, the heating intensities of at least two of the heating units increase gradually.

8. The dry distillation equipment according to claim 1, characterized in that: The external heating device is a high-temperature flue gas heating device, a flame heating device or an electric heating device.

9. The dry distillation equipment according to claim 1, characterized in that: The inner wall of the cylinder in the regenerative retort zone is coated with a high temperature resistant, wear resistant, heat insulating and anti-coking coating layer.

10. The dry distillation equipment according to claim 9, characterized in that: The material of the high temperature resistant, wear resistant, heat insulating and anti-coking coating layer is silicate, zirconium oxide or aluminum oxide.

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