Rotary kiln that can recover waste heat from flue gas

Abstract

The present invention relates to the technical field of incinerators and fluid fuel combustion equipment, and discloses a rotary furnace capable of recovering waste heat from flue gas, comprising a furnace body, a furnace cavity formed in the furnace body, a first opening and a second opening formed at both ends of the furnace cavity, and an air inlet device arranged at the first opening and a silo device arranged at the second opening; the silo device comprises a silo cavity and a flue gas pipeline formed at the first end of the silo cavity, and a discharge hopper formed at the second end of the silo cavity, a flue gas passage is formed in the furnace body wall, one end of the flue gas passage extends into the furnace cavity, and the other end extends out of the furnace body. The rotary furnace capable of recovering waste heat from flue gas disclosed in the present invention can use the heat of the flue gas itself to keep the rotary furnace warm, and at the same time use the heat of the flue gas to preheat the metal waste to be smelted, thereby improving thermal efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of incinerators and fluid fuel combustion equipment, and in particular to a rotary furnace capable of recovering flue gas waste heat. Background Art

[0002] An incinerator is a device used to convert waste into ash, gas and a small amount of residue through high-temperature combustion. A rotary kiln is a type of incinerator. Its processing space is usually a rotatable cylindrical furnace body. The material enters from one end. The material tumbles continuously as the furnace body slowly rotates. During the displacement process, it is heated by the heat source in the furnace (such as the hot air flow generated by combustion, etc.), thereby completing the corresponding process treatment. It is widely used in chemical, metallurgical, building materials and other industries.

[0003] Rotary kilns are also used in waste recycling and treatment. For example, they can process metal waste and melt the metal before processing. Specifically, the rotary kiln for processing metal includes a rotatable cylindrical furnace body, which generates high temperature through a heating device (such as gas combustion). Metal raw materials are loaded from one end of the furnace body. As the furnace body continues to rotate, the metal is fully heated and tumbled in the furnace, absorbing heat evenly, gradually heating up until it reaches the melting point and melts. The operation process will produce smoke accompanied by impurities.

[0004] In the existing operation of smelting metal waste in a rotary furnace, natural gas is used as fuel and oxygen as combustion-supporting gas. The operating temperature can reach over 1500 degrees Celsius, and the temperature of the flue gas produced is also very high. Direct discharge causes huge energy waste. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes to use the heat of the flue gas itself to keep the rotary furnace warm, and at the same time use the heat of the flue gas to preheat the metal waste to be smelted, so that part of the heat of the flue gas can be recovered. Based on this, one purpose of the present invention is to propose a rotary furnace that can recover the waste heat of the flue gas.

[0006] The rotary furnace capable of recovering waste heat from flue gas proposed in the present invention comprises a furnace body, a furnace cavity is formed in the furnace body, a first opening and a second opening are formed at two ends of the furnace cavity, and also comprises an air inlet device arranged at the first opening and a silo device arranged at the second opening;

[0007] In the rotary furnace thus arranged, the air inlet device is used to introduce combustion gas and combustion-supporting gas into the furnace cavity through the first opening and to complete ignition, and the silo device is used to introduce materials into the furnace cavity through the second opening, and the flue gas generated in the furnace cavity can also enter the silo device through the second opening, preheating the material in the silo device before discharging it, thereby recovering part of the heat energy of the flue gas.

[0008] The difference from the prior art is that the silo device includes a silo cavity and a smoke pipeline formed at a first end of the silo cavity, and a discharge hopper formed at a second end of the silo cavity, a smoke passage is formed in the furnace wall, one end of the smoke passage extends into the furnace cavity, and the other end extends out of the furnace body:

[0009] When the second opening is connected to the smoke pipeline, the smoke pipeline can close the second opening, so that the smoke generated in the furnace cavity can pass through the smoke passage into the smoke pipeline, and then pass into the silo cavity and then be discharged;

[0010] When the second opening is connected to the discharge hopper, the material in the silo cavity can be placed into the furnace cavity through the discharge hopper and the second opening.

[0011] The purpose of such arrangement is that when the rotary kiln is in operation, the second opening is connected to the flue gas pipeline, so that the flue gas can enter the flue gas pipeline through the flue gas passage and the second opening in sequence, and then enter the silo cavity through the flue gas pipeline, so that the furnace body can be kept warm and the material in the silo cavity can be preheated at the same time, and part of the heat energy of the flue gas can be recovered to improve the energy utilization rate;

[0012] After the rotary kiln operation is completed and the materials are discharged, the second opening is connected to the discharge hopper so that the preheated materials can be added into the furnace cavity through the second opening.

[0013] In some examples of the present invention, the flue gas passage includes a wall inlet and a wall outlet formed at both ends of the flue gas passage, the wall inlet is opened at one end of the furnace wall close to the second opening and is open to the furnace cavity, the wall outlet is also opened at one end of the furnace wall close to the second opening and is open to the outside of the furnace body, and the middle part of the flue gas passage extends toward one end of the furnace wall close to the first opening.

[0014] The purpose of such arrangement is to make the flue gas passage start from the wall inlet, extend to the end of the furnace body wall close to the first opening, extend to a certain extent, and then extend to the end close to the second opening, and end at the wall outlet, so that the flue gas passage can basically cover the furnace body in the axial direction of the furnace body, thereby achieving the heat preservation operation of the furnace body;

[0015] In addition, the rotary furnace generally used for metal melting has a furnace body made of multiple layers of materials, which are arranged from the outside to the inside as a steel shell, a nano-insulation layer, a thermal insulation layer and a high-temperature working layer. In this scheme, the thermal insulation layer can be replaced by a flue gas passage, and the heat of the flue gas itself is used to insulate the furnace body.

[0016] In some examples of the present invention, an annular inner edge extends radially from the furnace body at one end of the second opening, a wall inlet is opened on the side of the annular inner edge facing the furnace cavity, and a wall outlet is opened on the side of the annular inner edge away from the furnace cavity.

[0017] The purpose of such arrangement is that, by arranging the annular inner edge, the through-wall inlet and the through-wall outlet can be arranged as close as possible to the second opening, and the through-wall inlet and the through-wall outlet can be arranged on both sides inside and outside the furnace body respectively.

[0018] In some examples of the present invention, an annular groove communicating with the wall inlet is further provided on the side of the annular inner edge facing the furnace cavity, and a filter is arranged in the annular groove.

[0019] The purpose of such a configuration is to use the filter to filter out larger impurities in the smoke before the smoke enters the wall inlet, so as to avoid the smoke passage being blocked as much as possible.

[0020] In some examples of the present invention, the flue gas passage also includes a wall inlet, a wall outlet and a loop. The wall inlet extends from one end of the furnace wall close to the second opening to one end close to the first opening, and the wall outlet extends from one end of the furnace wall close to the first opening to one end close to the second opening. The loop connects the wall inlet and the wall outlet at one end close to the first opening.

[0021] The purpose of such arrangement is that: a plurality of through-wall inlets and through-wall outlets can be arranged and distributed along the circumference of the furnace body so as to cover the circumference of the furnace body, and the loop connects the through-wall inlets and the through-wall outlets at one end close to the first opening, so that the smoke can enter the through-wall inlet through the loop and enter the through-wall outlet, and finally be discharged through the through-wall outlet;

[0022] In addition, the flue gas passage arranged in this way is convenient for the production and preparation of the furnace body. Specifically, the furnace body is composed of a cylindrical body in the middle and end covers at both ends. The cylindrical body and the end covers are welded, so that the various parts of the flue gas passage can be formed on the furnace body before welding, and the whole flue gas passage can be formed after welding.

[0023] In some examples of the present invention, one end of the smoke pipeline close to the second opening is connected to a closed flange, and a flange smoke inlet is opened on the closed flange corresponding to the wall outlet, so that when the second opening is connected to the smoke pipeline, the smoke enters the smoke pipeline and the silo cavity in turn through the flange smoke inlet.

[0024] The purpose of such a setting is that when the second opening is connected to the flue gas pipeline, the closing flange corresponds to the second opening, and a friction seal is formed between the second opening (the furnace body will rotate along its circumferential direction when operating), and the closing flange closes the second opening, while the wall outlet is connected to the flange flue gas inlet, so that the flue gas will not be discharged through the second opening, but will be discharged at the wall outlet and enter the flue gas pipeline through the flange flue gas inlet. In this way, the furnace body can be kept warm while the material in the silo can be preheated. In addition, when set up in this way, the second opening can be retained so that it can be connected to the discharge hopper later to facilitate the placement of materials into the furnace body.

[0025] In some examples of the present invention, the rotary kiln further comprises a furnace body seat for supporting the furnace body, and the furnace body and the furnace body seat are supported by a track wheel assembly so that the furnace body is connected to the furnace body seat for relative rotation.

[0026] The purpose of such a setting is that the operating mode of the rotary kiln itself determines that it needs to rotate during operation. Therefore, the rotary kiln needs to be supported by the track wheel assembly. When subjected to external force, the track wheel assembly supports and guides the furnace body.

[0027] In some examples of the present invention, the track wheel assembly includes a rotating wheel seat fixed on the furnace body seat and a track wheel rotatably arranged on the rotating wheel seat, the track wheel is arranged corresponding to the track arranged on the furnace body, and the track is arranged along the circumference of the furnace body.

[0028] The purpose of such arrangement is that the track wheel is also connected to a device for outputting power, and when the device drives the track wheel to rotate, the friction between the track wheel and the track can drive the furnace body to rotate along its circumferential direction;

[0029] In some other embodiments, the track wheel and the track may also be meshed by setting teeth, and then the furnace body is driven to rotate through the meshing action.

[0030] In some examples of the present invention, the rotary furnace also includes a wheel chain assembly, which includes a plurality of wheels arranged at intervals and connecting rods located between each of the wheels, each connecting rod is rotatably connected to the adjacent wheel, the wheel chain assembly extends along the circumference of the furnace body so that the wheel contacts the circumferential surface of the furnace body, and both ends of the wheel chain assembly are connected to the furnace body seat.

[0031] The purpose of such arrangement is that although the furnace body is supported by the track wheels, it is easy to derail during the rotation process. Therefore, the rotating wheel chain assembly can further restrict the furnace body so that it can only rotate in the circumferential direction. Specifically, when the furnace body rotates, the rotating wheel is also rotated by the friction force of the peripheral surface of the furnace body. The connecting rod connects each rotating wheel, and the formed end is connected to the furnace body seat, thereby limiting the furnace body without restricting the rotational movement of the furnace body.

[0032] In some examples of the present invention, the rotary kiln also includes a fixed seat, which is hinged to the runner chain assembly, and a telescopic assembly, one end of the telescopic assembly is hinged to the fixed seat, and the other end is hinged to the runner chain assembly.

[0033] The purpose of such arrangement is that when materials need to be added, the telescopic assembly is controlled to extend to act on the runner chain assembly, and the runner chain assembly drives the furnace body to tilt, so that the second opening is dislocated and corresponds to the discharge hopper.

[0034] In some examples of the present invention, the rotary kiln further comprises a silo rack, the silo device is mounted on the silo rack, and the silo rack is slidably arranged relative to the furnace body.

[0035] The purpose of such arrangement is that when materials need to be added, the silo rack needs to drive the silo device backward to separate the second opening from the flue gas pipeline, leaving space for the tilting operation of the furnace body.

[0036] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 It is a front view of a rotary kiln capable of recovering waste heat from flue gas in an embodiment of the present invention;

[0039] Figure 2 It is a side view of the rotary kiln when the gas inlet device is separated from the furnace body in the embodiment of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the furnace body and the silo device when the furnace body is in a tilted state in an embodiment of the present invention;

[0041] Figure 4 It is a front view of a silo device in an embodiment of the present invention;

[0042] Figure 5 A side view of a rotary kiln in an embodiment of the present invention;

[0043] Figure 6 for Figure 5 The cross-sectional view of the rotary kiln at AA in the embodiment of the present invention is shown;

[0044] Figure 7 for Figure 5 The cross-sectional view of the rotary kiln at position BB in the embodiment of the present invention is shown.

[0045] Description of reference numerals:

[0046] Furnace body 1, cylinder 11, first end cover 12, first opening 121, molten metal outlet 122, second end cover 13, second opening 131, annular inner edge 132, annular groove 133, filter 134, furnace cavity 14, track 15;

[0047] Smoke passage a, through-wall inlet a1, through-wall outlet a2, through-wall inlet a3, end inlet a31, middle inlet a32, through-wall outlet a4, end outlet a41, middle outlet a42, loop a5;

[0048] Gas inlet device 2, flange end cover 21, gas passage 22, oxygen passage 23, column 24, rod 25, first cylinder 26;

[0049] Silo device 3, silo cavity 31, perforated plate 311, silo door 312, flue gas pipeline 32, discharge hopper 33, second cylinder 34, closing flange 35, flange flue gas inlet 351;

[0050] Silo frame 4, frame body 41, slide rail 42, third cylinder 43, fixed pile 44, pulley 45;

[0051] Smoke hopper 5;

[0052] Furnace seat 6;

[0053] Track wheel assembly 7, rotating wheel seat 71, track wheel 72;

[0054] Rotating wheel chain assembly 8, rotating wheel 81, connecting rod 82, rivet 83, rivet seat 84, cross bar 85;

[0055] Fixed seat 9, fourth cylinder 91. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0060] Reference below Figure 1 to Figure 7 The rotary kiln capable of recovering waste heat from flue gas according to an embodiment of the present invention is shown and is suitable for smelting metal waste.

[0061] Please see attached Figure 1 , which is a front view of a rotary furnace capable of recovering waste heat from flue gas. The rotary furnace comprises a furnace body 1, in which a furnace cavity 14 is formed, with a first opening 121 and a second opening 131 formed at both ends of the furnace cavity 14, and further comprises an air inlet device 2 arranged at the first opening 121 and a silo device 3 arranged at the second opening 131.

[0062] Please continue to see the attached Figure 1The air inlet device 2 includes a flange end cover 21 and a gas passage 22 and an oxygen passage 23 connected to the flange end cover 21. When the flange end cover 21 corresponds to the first opening 121, both the gas and oxygen enter the furnace chamber 14 through the flange end cover 21; at the same time, an igniter (not shown in the figure) is also arranged at the flange end cover 21, so that the mixed gas of the gas and oxygen burns at a position close to the first opening 121 in the furnace chamber 14. During the combustion process, in order to make the material evenly heated, the furnace body 1 is in a rotating state, and there is a friction seal between the flange end cover 21 and the first opening 121.

[0063] Please see attached Figure 2 , attached Figure 2 The side view of the rotary kiln when the air inlet device 2 is separated from the furnace body 1, the air inlet device 2 also includes a column 24, the column 24 is used to be fixed on the ground, the flange end cover 21 is rotatably connected to the column 24 through a rod 25, so that the flange end cover 21 is supported on the column 24, and the flange end cover 21 and the furnace body 1 are relatively connected, specifically, connected through a first cylinder 26, the input end of the first cylinder 26 is relatively connected to the furnace body 1 (the specific connection method is described later), and the output end of the first cylinder 26 is hinged to an end of the connecting rod 25 close to the flange end cover 21. When the first opening 121 needs to be opened, or the furnace body 1 needs to be tilted (the tilting operation of the furnace body 1 is described later) and the air inlet device 2 is retreated, the first cylinder 26 is extended to drive the air inlet device 2 to rotate with the column 24 as the axis and the rod 25 as the radius, so that the air inlet device 2 is separated from the first opening 121, that is, the air inlet device 2 and the furnace body 1 are in Figure 2 Status shown.

[0064] Please continue to see the attached Figure 1 and attached Figure 3 , attached Figure 3 1 is a schematic diagram of the structure of the furnace body 1 and the silo device 3 when the furnace body 1 is in a tilted state. The silo device 3 includes a silo cavity 31 and a smoke pipe 32 formed at a first end of the silo cavity 31, and a discharge hopper 33 formed at a second end of the silo cavity 31, wherein the smoke pipe 32 is located below the silo cavity 31 and the discharge hopper 33. When the furnace body 1 is in a horizontal state, the second opening 131 may correspond to the smoke pipe 32, and the smoke generated in the furnace cavity 14 may enter the silo cavity 31 through the smoke pipe 32 to preheat the material, and the smoke after heat exchange is discharged through an outlet provided on the silo device 3. When the furnace body 1 is in a state such as Figure 3 In the tilted state shown, the second opening 131 may correspond to the discharge hopper 33 , so that the preheated metal material may be placed into the furnace chamber 14 through the second opening 131 .

[0065] Please continue to see the attached Figure 4, is a front view of the silo device 3, in which a porous plate 311 (shown by a dotted line) is arranged in the silo cavity 31, so that the smoke in the smoke pipe 32 can enter the silo cavity 31 through the porous plate 311, while preventing the material in the silo cavity 31 from flowing into the smoke pipe 32.

[0066] Please continue to see the attached Figure 4 The porous plate 311 is tilted, and its tilting direction follows the discharge hopper 33, so that the material can be discharged from the silo cavity 31 along the porous plate 311 under the action of gravity.

[0067] Please continue to see the attached Figure 1 The silo cavity 31 is provided with a discharge port (not shown in the figure) at the position where it is connected to the discharge hopper 33, and a silo door 312 is provided at the discharge port. The silo door 312 is controlled to open and close by the second cylinder 34 (the installation method of the second cylinder 34 is explained below).

[0068] Please continue to see the attached Figure 1 The rotary kiln also includes a silo rack 4, on which the silo device 3 is mounted, and the silo rack 4 is slidably arranged relative to the furnace body 1. Specifically, the silo rack 4 includes a frame 41 and a slide rail 42, and the silo cavity 31 is fixedly welded to the frame 41. A pulley 45 corresponding to the slide rail 42 is provided at the lower end of the frame 41, wherein the slide rail 42 is fixed to the ground, so that the silo device 3 can translate under the action of external force to move closer to or away from the furnace body 1, and the pulley 45 and the slide rail 42 assist its displacement, leaving space for tilting operation for the furnace body 1.

[0069] Please continue to see the attached Figure 1 The silo frame 4 also includes a third cylinder 43 and a fixed pile 44. The fixed pile 44 is used to be fixed on the ground. Both ends of the third cylinder 43 are respectively connected to the fixed pile 44 and the frame 41, so that the power for the displacement of the frame 41 comes from the third cylinder 43.

[0070] Please continue to see the attached Figure 1 The output end of the second cylinder 34 is connected to the silo door 312, and the other end is fixedly connected to the silo frame 4.

[0071] Please continue to see the attached Figure 1 The rotary kiln also includes a smoke hopper 5, which is umbrella-shaped and connected to negative pressure. The hood is arranged directly above the second opening 131 and the smoke pipeline 32 of the rotary kiln. Its function is that when the second opening 131 switches between the smoke pipeline 32 and the smoke pipeline 32, the smoke will leak, so the smoke hopper 5 is arranged to absorb the smoke at this time.

[0072] Please see attached Figure 5 ~Attached Figure 7 , attached Figure 5 The side view of the rotary kiln is shown in Figure 1. Figure 6This is a cross-sectional view of the rotary furnace at A-A, with Figure 7 is a cross-sectional view of the rotary kiln at B - B, a smoke passage a is formed in the wall of the furnace body 1, one end of the smoke passage a extends into the furnace cavity 14, and the other end extends outside the furnace body 1: when the second opening 131 is connected to the smoke pipe 32, the smoke pipe 32 can close the second opening 131, so that the smoke generated in the furnace cavity 14 can pass through the smoke passage a and then into the smoke pipe 32, and then into the silo cavity 31 and then be discharged. At this time, the furnace body 1 is in Figure 4 In the horizontal state shown in FIG. 1 , the flue gas can achieve the effect of heat preservation on the furnace cavity 14 and preheating the material in the silo; when the second opening 131 is connected with the discharge hopper 33, the material in the silo cavity 31 can be placed into the furnace cavity 14 through the discharge hopper 33 and the second opening 131. At this time, the furnace body 1 is in Figure 3 The tilted state shown;

[0073] While the furnace body 1 is in Figure 3 Before reaching the tilted state shown in the figure, the molten metal liquid needs to be poured out, so please continue to refer to the attached Figure 5 A molten metal outlet 122 is provided on the side of the furnace body 1, that is, the furnace body 1 is rotated to make the molten metal outlet 122 at the lowest position, and the molten metal outlet 122 is opened to allow the molten metal to flow out.

[0074] Please continue to see the attached Figure 6 ~Attached Figure 7 The flue gas passage a includes a wall inlet a1 and a wall outlet a2 formed at both ends of the flue gas passage a. The wall inlet a1 is opened at one end of the furnace body 1 wall close to the second opening 131 and is open to the furnace cavity 14. The wall outlet a2 is also opened at one end of the furnace body 1 wall close to the second opening 131 and is open to the outside of the furnace body 1. The middle part of the flue gas passage a extends to one end of the furnace body 1 wall close to the first opening 121.

[0075] Please continue to see the attached Figure 6 ~Attached Figure 7 An annular inner edge 132 extends radially from the furnace body 1 at one end of the second opening 131 , a wall inlet a1 is opened on the side of the annular inner edge 132 facing the furnace cavity 14 , and a wall outlet a2 is opened on the side of the annular inner edge 132 away from the furnace cavity 14 .

[0076] Please continue to see the attached Figure 6 ~Attached Figure 7 An annular groove 133 communicating with the wall inlet a1 is formed on the side of the annular inner edge 132 facing the furnace chamber 14. A filter 134 is arranged in the annular groove 133. The filter 134 is a ceramic filter for filtering larger impurities in the flue gas.

[0077] Please continue to see the attached Figure 6 ~Attached Figure 7The flue gas passage a also includes a wall inlet a3, a wall outlet a4 and a loop a5. The wall inlet a3 extends from one end of the furnace body 1 wall close to the second opening 131 to one end close to the first opening 121, and the wall outlet a4 extends from one end of the furnace body 1 wall close to the first opening 121 to one end close to the second opening 131. The loop a5 connects the wall inlet a3 and the wall outlet a4 at one end close to the first opening 121.

[0078] Please continue to see the attached Figure 6 ~Attached Figure 7 The furnace body 1 includes a cylinder 11 located in the middle and a first end cover 12 and a second end cover 13 located at both ends. The first end cover 12 and the second end cover 13 are both umbrella-shaped, and their open ends are respectively welded to the two ends of the cylinder 11, and their closed ends form a first opening 121 and a second opening 131, respectively.

[0079] Please continue to see the attached Figure 6 There are several through-wall passages a3, each of which is composed of an end passage a31 opened on the wall of the second end cover 13 and a middle passage a32 opened on the wall of the cylinder 11. The connection between the end passage a31 and the middle passage a32 is sealed by welding between the cylinder 11 and the second end cover 13;

[0080] Similarly, please refer to the attached Figure 7 There are also several through-wall outlets a4, each of which is composed of an end outlet a41 opened on the wall of the second end cover 13 and a middle outlet a42 opened on the wall of the cylinder 11. The connection between the end outlet a41 and the middle outlet a42 is sealed by welding between the cylinder 11 and the second end cover 13;

[0081] Please continue to see the attached Figure 6 ~Attached Figure 7 The loop a5 is opened at one end of the cylinder 11 close to the first end cover 12, and is formed into a ring shape facing the depression of the first end cover 12, so that the middle inlet a32 and the middle outlet a42 close to the first end cover 12 are both connected to the loop a5, and the outer side of the loop a5 is sealed by the welding action of the cylinder 11 and the first end cover 12;

[0082] The purpose of such arrangement is to make the flue gas passage a cover the entire wall of the furnace body 1 as much as possible, and to facilitate production.

[0083] Please continue to see the attached Figure 6 ~Attached Figure 7One end of the smoke pipe 32 close to the second opening 131 is connected to the closed flange 35, and a flange smoke inlet 351 is opened on the closed flange 35 corresponding to the wall outlet a2, so that when the second opening 131 is connected to the smoke pipe 32, the second opening 131 can be closed and the smoke can enter the smoke pipe 32 and the silo cavity 31 in sequence through the flange smoke inlet 351.

[0084] Please continue to see the attached Figure 1 ~Attached Figure 2 The rotary kiln also includes a furnace body seat 6 for supporting the furnace body 1. The furnace body 1 and the furnace body seat 6 are supported by a track wheel assembly 7, so that the furnace body 1 is connected to the furnace body seat 6 for relative rotation, so that the furnace body 1 performs a rotary motion during operation.

[0085] Please continue to see the attached Figure 1 ~Attached Figure 2 The track wheel assembly 7 includes a rotating wheel seat 71 fixed on the furnace body seat 6 and a track wheel 72 rotatably arranged on the rotating wheel seat 71. The track wheel 72 is arranged corresponding to the track 15 arranged on the furnace body 1. The track 15 is arranged along the circumference of the furnace body 1, that is, the furnace body 1 is supported by the track wheel 72, and the track wheel 72 can be driven by a power device to rotate the track wheel 72, and then the furnace body 1 is driven to rotate through the friction between the track wheel 72 and the furnace body 1. The power device is generally composed of a motor and a reducer (not shown in the figure).

[0086] Please continue to see the attached Figure 1 ~Attached Figure 2 The rotary furnace also includes a wheel chain assembly 8, which includes a plurality of rotating wheels 81 arranged at intervals and connecting rods 82 located between the rotating wheels 81, each connecting rod 82 is rotatably connected to the adjacent rotating wheel 81, and the wheel chain assembly 8 extends along the circumference of the furnace body 1, so that the rotating wheels 81 are in contact with the circumferential surface of the furnace body 1, and the two ends of the wheel chain assembly 8 are connected to the furnace body seat 6; that is, the furnace body 1 is further limited by the wheel chain assembly 8 to prevent it from being separated from the furnace body seat 6 when rotating.

[0087] Since the connecting rod 82 of the wheel chain assembly 8 is in a relatively static state when the rotary kiln rotates, the first cylinder 26 is hinged on the connecting rod 82 of the wheel chain assembly 8 , so that the connection method of the first cylinder 26 will not affect the operation of the furnace body 1 .

[0088] Please continue to see the attached Figure 1 ~Attached Figure 2 The two ends of the rotating wheel chain assembly 8 are connected with rivets 83, and a rivet seat 84 is fixed on the furnace body seat 6, and the rivet 83 is connected to the furnace body seat 6.

[0089] Please continue to see the attached Figure 1The rotary furnace also includes a fixed seat 9 and a telescopic assembly. The fixed seat 9 is relatively hinged to the runner chain assembly 8. One end of the telescopic assembly is hinged to the fixed seat 9, and the other end is relatively hinged to the runner chain assembly 8. Therefore, when the telescopic assembly is telescoped, the furnace body 1 can be tilted. In order to reserve a tilting space for the furnace body 1, there is generally an operating pit (not shown in the figure) on the bottom surface directly below the furnace body 1, and the fixed seat 9 is fixed on both sides of the operating pit.

[0090] Please continue to see the attached Figure 1 The telescopic component is the fourth cylinder 91. There are two turntable chain components 8, which are respectively arranged on both sides of the furnace body 1. A cross bar 85 is also connected between the turntable chain components 8. The lower end of the fixed seat 9 is fixed to the ground, and the upper end is hinged to the middle part of the cross bar 85. The lower end of the fourth cylinder 91 is hinged to the fixed seat 9, and the upper end is hinged to the end of the cross bar 85 closer to the second opening 131. In this way, when the fourth cylinder 91 is extended, it can drive the furnace body 1 to tilt.

[0091] Other structures of the rotary kiln according to the embodiment of the present invention, such as the cylinder and the like, and operations are well known to those skilled in the art and will not be described in detail here.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0093] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotary kiln capable of recovering waste heat from flue gas, characterized in that: It comprises a furnace body, wherein a furnace cavity is formed in the furnace body, and two ends of the furnace cavity form a first opening and a second opening, and also comprises an air inlet device arranged at the first opening and a silo device arranged at the second opening; The silo device comprises a silo cavity, a smoke pipeline formed at a first end of the silo cavity, and a discharge hopper formed at a second end of the silo cavity. A smoke passage is formed in the furnace wall, one end of the smoke passage extends into the furnace cavity, and the other end extends out of the furnace body: When the second opening is connected to the smoke pipe, the smoke pipe can close the second opening, so that the smoke generated in the furnace cavity can pass through the smoke passage into the smoke pipe, and then pass into the silo cavity before being discharged; When the second opening is connected to the discharge hopper, the material in the silo cavity can be placed into the furnace cavity through the discharge hopper and the second opening; The flue gas passage includes a wall inlet and a wall outlet formed at both ends of the flue gas passage. The wall inlet is opened on one end of the furnace wall close to the second opening and is open to the furnace cavity. The wall outlet is also opened on one end of the furnace wall close to the second opening and is open to the outside of the furnace body. The middle part of the flue gas passage extends toward one end of the furnace wall close to the first opening.

2. The rotary kiln capable of recovering waste heat from flue gas according to claim 1, characterized in that: The furnace body has an annular inner edge extending radially along the furnace body at one end of the second opening, the through-wall inlet is opened on the side of the annular inner edge facing the furnace cavity, and the through-wall outlet is opened on the side of the annular inner edge away from the furnace cavity.

3. The rotary kiln capable of recovering waste heat from flue gas according to claim 1, characterized in that: The flue gas passage also includes a through-wall inlet, a through-wall outlet and a loop. The through-wall inlet extends from one end of the furnace wall close to the second opening to one end close to the first opening. The through-wall outlet extends from one end of the furnace wall close to the first opening to one end close to the second opening. The loop connects the through-wall inlet and the through-wall outlet at one end close to the first opening.

4. The rotary kiln capable of recovering waste heat from flue gas according to claim 2 or 3, characterized in that: One end of the flue gas pipeline close to the second opening is connected to a closed flange, and a flange flue gas inlet is provided on the closed flange corresponding to the wall outlet, so that when the second opening is connected to the flue gas pipeline, the flue gas enters the flue gas pipeline and the silo cavity in turn through the flange flue gas inlet.

5. The rotary kiln capable of recovering waste heat from flue gas according to any one of claims 1 to 3, characterized in that: It also includes a furnace body seat for supporting the furnace body. The furnace body and the furnace body seat are supported by a track wheel assembly so that the furnace body is connected to the furnace body seat for relative rotation.

6. The rotary kiln capable of recovering waste heat from flue gas according to claim 5, characterized in that: The track wheel assembly comprises a rotating wheel seat fixed on the furnace body seat and a track wheel rotatably arranged on the rotating wheel seat, wherein the track wheel is arranged corresponding to a track arranged on the furnace body, and the track is arranged along the circumference of the furnace body.

7. The rotary kiln capable of recovering waste heat from flue gas according to claim 5, characterized in that: It also includes a wheel chain assembly, which includes a plurality of wheels arranged at intervals and connecting rods located between the wheels in pairs, each connecting rod is rotatably connected to the adjacent wheel, and the wheel chain assembly extends along the circumference of the furnace body so that the wheels are in contact with the circumferential surface of the furnace body, and both ends of the wheel chain assembly are connected to the furnace body seat.

8. The rotary kiln capable of recovering waste heat from flue gas according to claim 7, characterized in that: It also includes a fixing seat, which is hinged relative to the rotating wheel chain assembly, and a telescopic assembly, one end of which is hinged on the fixing seat, and the other end is hinged relative to the rotating wheel chain assembly.

9. The rotary kiln capable of recovering waste heat from flue gas according to any one of claims 1 to 3, characterized in that: It also includes a silo rack, the silo device is installed on the silo rack, and the silo rack is slidably arranged relative to the furnace body.

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