Kiln tail cover and rotary kiln

Abstract

The embodiment of the utility model provides a kiln tail cover and a rotary kiln. The kiln tail cover comprises a cover body shell and a splitter plate. The cover body shell is provided with a cover body cavity, a kiln body air inlet and a kiln body air outlet; the splitter plate is arranged in the cover body cavity, the splitter plate comprises a plate body and a splitter piece set arranged on the plate body, the plate body is rotatably arranged on the cover body shell relative to the cover body shell, and the splitter piece set is arranged opposite to the kiln body air inlet; therefore, the mixed gas flowing into the rotary kiln is stirred through the splitter plate. The splitter plate can guide combustion-supporting air flow, mixed gas can be promoted to enter the cover body shell along the combustion-supporting air flow, the stirred gas can fully disturb materials, and full contact of gas and solid is achieved. Therefore, the kiln tail cover provided by the embodiment of the utility model has the advantage of improving the sufficiency of material combustion.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to a kiln tail cover and a rotary kiln with the kiln tail cover. Background Art

[0002] A rotary kiln typically refers to a rotating calcining kiln, primarily used to burn solid waste. Rotary kilns are frequently used in the solid and hazardous waste treatment industries for incineration. Rotary kiln incineration can be categorized as either co-current or counter-current, depending on the direction of material flow within the kiln. In co-current rotary kilns, the material flow direction aligns with the combustion air flow. Counter-current kilns are often used to reduce kiln size. However, direct combustion air into the kiln limits material disturbance, relying primarily on the kiln's rotation to bring the material into contact with the combustion air, which can compromise the complete combustion of the material at the slag discharge stage. Utility Model Content

[0003] The present invention aims to solve, at least to a certain extent, one of the technical problems in the related art. To this end, an embodiment of the present invention provides a kiln tail hood. The kiln tail hood has the advantage of improving the completeness of material combustion.

[0004] The embodiment of the present utility model further provides a rotary kiln.

[0005] The kiln tail hood of the embodiment of the utility model comprises a hood shell and a diverter plate.

[0006] The cover shell has a cover cavity, a kiln air inlet and a kiln air exhaust; the diverter plate is arranged in the cover cavity, and the diverter plate includes a plate body and a diverter plate group arranged on the plate body, and the plate body is rotatably arranged on the cover shell relative to the cover shell, and the diverter plate group is arranged opposite to the kiln air inlet so as to stir the mixed gas flowing into the rotary kiln through the diverter plate.

[0007] The kiln tail hood of the present invention, by providing a diverter plate within the hood shell, not only guides the combustion-supporting airflow but also encourages the flue gas, fuel, and air mixture to flow into the hood shell along the combustion-supporting airflow and be evenly mixed under the agitation of the diverter plate. The agitated gas can fully disturb the material, achieving full contact between gas and solid. Furthermore, for furnace types with relatively short kiln bodies, such as countercurrent rotary kilns, while maintaining the same operating efficiency as existing downstream rotary kilns, not only is the length of the rotary kiln shortened (by approximately 20%, saving equipment and operating costs), but the completeness of material combustion is also improved.

[0008] Therefore, the kiln tail hood of the embodiment of the present invention has the advantage of improving the sufficiency of material combustion.

[0009] In some embodiments, the diverter plate is a ceramic diverter plate, and the diverter plate group is a ceramic plate.

[0010] In some embodiments, the plate body includes a disk body portion and an extension portion, the outer end of the extension portion is smoothly connected to the disk body portion, the inner end of the extension portion extends along the axial direction of the disk body portion from the center of the disk body portion to the edge of the disk body portion, and the thickness of the extension portion decreases from the center of the plate body to the edge of the plate body. Each of the diverter plate groups includes multiple diverter plates, and the multiple diverter plates are arranged at intervals along the circumference of the extension portion.

[0011] In some embodiments, the plate body has a plurality of ventilation holes, and the plurality of ventilation holes are arranged on the plate body at intervals.

[0012] In some embodiments, the radius of the plate body is smaller than the length of the diverter piece, and the diverter piece is connected to the inner wall of the cover body cavity.

[0013] In some embodiments, the diverter includes a pressure surface and a suction surface connecting the leading edge end and the trailing edge end together, the side of the diverter connected to the plate body is the bottom end of the blade of the diverter, and the side of the diverter opposite to the bottom end of the blade is the top end of the blade of the diverter, the pressure surface and the suction surface extend from the bottom end of the blade of the diverter to the top end of the blade of the diverter, the suction surface convex toward the preset direction to form a curved surface, and the pressure surface is concave toward the preset direction to form a curved surface.

[0014] In some embodiments, the thickness of the blade top first increases and then decreases from the leading edge to the trailing edge, and the thickness of the blade bottom of the splitter first increases and then decreases from the leading edge to the trailing edge.

[0015] In some embodiments, the difference between the thicknesses corresponding to the bottom end of the blade and the top end of the blade in the same radial direction first increases and then decreases from the leading edge end to the trailing edge end.

[0016] In some embodiments, the kiln tail hood of the present invention also includes a slag discharge pipe, the kiln body exhaust port and the kiln body air inlet are arranged opposite to each other in the axial direction of the hood shell, and a slag discharge port is provided on the hood shell, the slag discharge port is opened at the lower part of the hood shell, and the slag discharge pipe is connected to the slag discharge port.

[0017] The rotary kiln of the embodiment of the present invention comprises a kiln head hood, a kiln shell and a kiln tail hood according to any one of the above, wherein the kiln head hood and the kiln tail hood are arranged opposite to each other at the two ends of the kiln shell in the direction of length extension. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a rotary kiln according to an embodiment of the present invention.

[0019] Figure 2 It is a front view of the kiln tail hood of an embodiment of the present utility model.

[0020] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0021] Figure 4 It is a schematic diagram of the interior of the kiln tail hood according to an embodiment of the present invention.

[0022] Figure 5 It is a three-dimensional diagram of a kiln tail hood according to another embodiment of the present invention.

[0023] Figure 6 It is a side view of the diverter plate according to an embodiment of the present utility model.

[0024] Figure 7 This is a front view of the diverter plate of an embodiment of the present utility model.

[0025] Reference numerals:

[0026] Kiln tail cover 100; kiln shell 200; kiln head cover 300;

[0027] Cover shell 1; kiln air inlet 11; kiln air outlet 12; slag outlet 13;

[0028] Slag discharge pipe 2;

[0029] Diverter plate 3;

[0030] Plate body 31; disc portion 311; extension portion 312; vent hole 313;

[0031] The splitter 32 has a leading edge 321 , a trailing edge 322 , a blade bottom 323 , and a blade top 324 . DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0033] Reference below Figure 1-Figure 7 The kiln tail hood 100 and the rotary kiln according to the embodiment of the present invention are described.

[0034] The kiln tail hood 100 of the embodiment of the present utility model includes a hood shell 1 and a diverter plate 3 .

[0035] The cover shell 1 has a cover cavity, a kiln air inlet 11 and a kiln exhaust port 12; the diverter plate 3 is arranged in the cover cavity, and the diverter plate 3 includes a plate body 31 and a diverter plate group arranged on the plate body 31, and the plate body 31 is rotatably arranged on the cover shell 1 relative to the cover shell 1. The diverter plate group is arranged opposite to the kiln air inlet 11 so as to stir the mixed gas flowing into the rotary kiln through the diverter plate 3.

[0036] The kiln tail hood 100 of the embodiment of the present invention has a diverter plate 3 disposed within the hood shell 1. The diverter plate 3 can not only guide the combustion-supporting airflow, but also promote the mixed gas composed of flue gas, fuel and air to enter the hood shell 1 along the combustion-supporting airflow and be evenly mixed under the stirring of the diverter plate 3. The stirred mixed gas can fully disturb the material and achieve full contact between gas and solid. Furthermore, for furnace types with relatively short kiln bodies such as countercurrent rotary kilns, while ensuring the same working efficiency as existing downstream rotary kilns, not only the length of the rotary kiln is shortened (the length is shortened by about 20%, which helps to reduce equipment costs and operating expenses), but also the completeness of material combustion is improved.

[0037] Therefore, the kiln tail hood 100 of the embodiment of the present invention has the advantage of improving the sufficiency of material combustion.

[0038] The diverter plate 3 is a ceramic diverter plate, and the diverter sheet group is a ceramic sheet. Because the ceramic material has a good heat resistance effect, the diverter plate 3 made of ceramic has the advantage of good heat resistance.

[0039] like Figures 5 to 7 As shown, the plate body 31 includes a disk body portion 311 and an extension portion 312. The outer end of the extension portion 312 is smoothly connected to the disk body portion 311, and the inner end of the extension portion 312 extends along the axial direction of the disk body portion 311 from the center of the disk body portion 311 to the edge of the disk body portion 311. The thickness of the extension portion 312 decreases from the center of the plate body 31 to the edge of the plate body 31. Each diverter plate group includes multiple diverter plates 32, and the multiple diverter plates 32 are arranged at intervals along the circumference of the extension portion 312.

[0040] The kiln tail hood 100 of the embodiment of the present invention divides the plate body 31 into a disc portion 311 and two extension portions 312. The thickness of the extension portions 312 decreases along the radial direction of the plate body 31 from the center of the plate body 31 to the edge of the plate body 31. This can disperse the combustion-supporting airflow entering the hood cavity from the kiln body air inlet, and play a certain mixing, dispersion and guiding role on the combustion-supporting airflow entering the hood cavity from the kiln body air inlet.

[0041] In addition, the kiln tail hood 100 of the embodiment of the present invention can improve the mass flow rate in the hood cavity by providing multiple diverter plates 32 in each diverter plate group, thereby improving the rotation efficiency.

[0042] Optionally, the number of diverter plates 32 in each diverter plate group is 4-10, which can ensure that the diverter plates 32 can work on the combustion-supporting airflow and meet the diverter plate 3's requirement for boosting the mixed gas.

[0043] Optionally, the disc body 311 and the extension 312 can be integrally formed. Thus, the disc body 311 and the extension 312 can be first formed into a single ceramic blank and then sintered as a whole. Thus, the kiln tail hood 100 has the advantages of good structural integrity and ease of processing.

[0044] The plate body 31 has a plurality of air holes 313 , which are spaced apart from each other on the plate body 31 . Thus, part of the gas can pass through the air holes 313 and enter the kiln shell 200 .

[0045] like Figures 5 to 7 As shown, the radius of the plate 31 is smaller than the length of the diverter 32. This can avoid the problem of poor ventilation caused by the plate blocking the kiln exhaust port 12.

[0046] Furthermore, the diverter piece 32 is connected to the inner wall of the housing cavity so as to fix the diverter piece 32 .

[0047] like Figures 5 to 7 As shown, the diverter piece 32 includes a pressure surface and a suction surface connecting the leading edge end 321 and the trailing edge end 322 together. The side of the diverter piece 32 connected to the plate body 31 is the blade bottom end 323 of the diverter piece 32, and the side of the diverter piece 32 opposite to the blade bottom end 323 is the blade top end 324 of the diverter piece 32. The pressure surface and the suction surface extend from the blade bottom end 323 of the diverter piece 32 to the blade top end 324 of the diverter piece 32. The suction surface convexes toward the preset direction (circumferential direction of the plate body) to form a curved surface, and the pressure surface is concave toward the preset direction to form a curved surface.

[0048] The kiln tail hood 100 of the embodiment of the present invention has a suction surface that is convex in a preset direction to form a curved surface, and a pressure surface that is concave in a preset direction to form a curved surface. The suction surface can be used to increase the suction force of the diverter plate 32 on the mixed gas, so that the combustion-supporting airflow can quickly enter the diverter plate 3, and the pressure surface can be used to increase the work done by the diverter plate 32 on the mixed gas, pressurize the mixed gas to a certain extent, and thus help to increase the air intake speed per unit time. In addition, the provision of a convexity on the suction surface in the preset direction can effectively suppress the generation of vortices near the gap between the blade tips 324 of the suction surface, thereby reducing the energy loss of the combustion-supporting airflow.

[0049] like Figures 5 to 7 As shown, the thickness of the blade tip 324 first increases and then decreases from the leading edge 321 to the trailing edge 322 , and the thickness of the blade bottom 323 of the splitter 32 first increases and then decreases from the leading edge 321 to the trailing edge 322 .

[0050] The kiln tail hood 100 of the embodiment of the present invention is arranged so that the thickness of the bottom end 323 of the blade is first increased and then decreased from the leading edge end 321 to the trailing edge end 322. When the combustion-supporting airflow enters the flow channel formed between adjacent diverter plates 32, the increase in the thickness of the diverter plates 32 reduces the equivalent expansion angle of the flow channel of the adjacent diverter plates 32 to a certain extent, which is more in line with the flow path flow characteristics of the diverter plate 3, and can effectively suppress internal flow separation and reduce energy loss.

[0051] Furthermore, the sizes of the plurality of flow dividers 32 are equal to each other, and the difference between the thicknesses corresponding to the blade bottom end 323 and the blade top end 324 in the same radial direction first increases and then decreases from the leading edge end 321 to the trailing edge end 322 .

[0052] The difference between the corresponding thicknesses of the blade bottom end 323 and the blade top end 324 in the same radial direction first increases and then decreases from the leading edge end 321 to the trailing edge end 322 .

[0053] For example, Figures 2 to 4 As shown, a slag discharge port 13 is provided at the lower end of the cover shell 1 , the kiln air inlet 11 is arranged opposite to the plate body 31 in the axial direction of the diverter plate 3 , and the kiln air outlet 12 is arranged on one side of the cover shell 1 .

[0054] The rotary kiln according to the embodiment of the present invention comprises a kiln head hood 300, a kiln shell 200 and a kiln tail hood 100 according to any one of the above items. The kiln head hood 300 and the kiln tail hood 100 are arranged opposite to each other at the two ends of the kiln shell 100 in the length extension direction.

[0055] Therefore, the rotary kiln of the embodiment of the present invention has the advantage of improving the sufficiency of material combustion.

[0056] The kiln body is a circular cylinder. The diverter plate 3 not only forms a circular flow of the combustion-supporting airflow, but also flows along the inner wall of the kiln. That is, the combustion-supporting airflow moves in the opposite direction of the material, which can fully disturb the material and achieve full contact between gas and solid, providing more sufficient gas-solid contact, which is more conducive to the incineration of waste.

[0057] Optionally, the diameter of the kiln barrel can be 2.0m-4.0m, and the height can be 6m-12m. For example, in a hazardous waste disposal center, the diameter of the kiln barrel can be 3.5m and the height can be 9m; in a medical waste disposal center, the diameter of the kiln barrel can be 2.5m and the height can be 7m.

[0058] 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 to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0060] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A kiln tail hood, characterized in that: include: A cover shell, the cover shell having a cover cavity, a kiln air inlet and a kiln air outlet; A diverter plate is arranged in the cover cavity, and the diverter plate includes a plate body and a diverter plate group arranged on the plate body, and the plate body is rotatably arranged on the cover shell relative to the cover shell, and the diverter plate group is arranged opposite to the kiln body air inlet so as to stir the mixed gas flowing into the rotary kiln through the diverter plate.

2. The kiln tail hood according to claim 1, characterized in that: The diverter plate is a ceramic diverter plate, and the diverter sheet group is a ceramic sheet.

3. The kiln tail hood according to claim 1, characterized in that: The plate body includes a disk body portion and an extension portion, the outer end of the extension portion is smoothly connected to the disk body portion, the inner end of the extension portion extends along the axial direction of the disk body portion from the center of the disk body portion to the edge of the disk body portion, and the thickness of the extension portion decreases from the center of the plate body to the edge of the plate body. Each of the diverter plate groups includes multiple diverter plates, and the multiple diverter plates are arranged at intervals along the circumference of the extension portion.

4. The kiln tail hood according to claim 3, characterized in that: The radius of the plate body is smaller than the length of the diverter piece, and the diverter piece is connected to the inner wall of the cover body cavity.

5. The kiln tail hood according to claim 1, characterized in that: The plate body is provided with a plurality of ventilation holes, and the plurality of ventilation holes are arranged on the plate body at intervals.

6. The kiln tail hood according to claim 3, characterized in that: The diverter plate includes a pressure surface and a suction surface connecting the leading edge end and the trailing edge end together. The side of the diverter plate connected to the plate body is the bottom end of the blade of the diverter plate, and the side of the diverter plate opposite to the bottom end of the blade is the top end of the blade of the diverter plate. The pressure surface and the suction surface extend from the bottom end of the blade of the diverter plate to the top end of the blade of the diverter plate. The suction surface convexes toward a preset direction to form a curved surface, and the pressure surface is concave toward the preset direction to form a curved surface.

7. The kiln tail hood according to claim 6, characterized in that: The thickness of the blade top first increases and then decreases from the leading edge to the trailing edge, and the thickness of the blade bottom of the splitter first increases and then decreases from the leading edge to the trailing edge.

8. The kiln tail hood according to claim 6, characterized in that: The difference between the thicknesses corresponding to the bottom end of the blade and the top end of the blade in the same radial direction first increases and then decreases from the leading edge end to the trailing edge end.

9. The kiln tail hood according to any one of claims 1 to 8, characterized in that: It also includes a slag discharge pipe, the kiln body exhaust port and the kiln body air inlet are arranged opposite to each other in the axial direction of the cover shell, and a slag discharge port is provided on the cover shell, the slag discharge port is opened at the lower part of the cover shell, and the slag discharge pipe is connected to the slag discharge port.

10. A rotary kiln, characterized in that: The kiln comprises a kiln head hood, a kiln shell and a kiln tail hood according to any one of claims 1 to 9, wherein the kiln head hood and the kiln tail hood are arranged opposite to each other at two ends of the kiln shell in the direction of length extension.

Images