WO2021212694A1

WO2021212694A1 - Rotary kiln

Info

Publication number: WO2021212694A1
Application number: PCT/CN2020/107900
Authority: WO
Inventors: 朱书成; 王希彬; 吕艳伍; 李金峰
Original assignee: 河南龙成煤高效技术应用有限公司; 河北龙成煤综合利用有限公司
Priority date: 2020-04-23
Filing date: 2020-08-07
Publication date: 2021-10-28
Also published as: CN111365983A

Abstract

The embodiments of the present disclosure provide a rotary kiln, relating to the technical field of rotary kilns. The rotary kiln comprises a rotary kiln housing, and a feeding port and a discharge port provided at two ends of the rotary kiln housing. A heating assembly is provided on the peripheral wall of the inner cavity of the rotary kiln housing, a spiral blade group is provided close to the center side of the rotary kiln, and the heating assembly is fixedly connected to the spiral blade group. The inner cavity of the rotary kiln housing is provided with both the spiral blade group and the heating assembly; the spiral blade group is provided such that material delivery can be well performed while an inclination degree of the rotary kiln is in a range of relatively small values, and pyrolysis of coal is caused to rapidly proceed while the heating assembly has an excessively high intensity of thermal power, so as to achieve rapid pyrolysis of the rotary kiln, and improve production capacity. By using the rotary kiln provided in the embodiments of the present disclosure, using a manner of increasing the inclination for the purpose of improving the production capacity can be avoided, effectively alleviating the problem of an excessive load on a supporting roller of the rotary kiln due to an excessively large inclination degree.

Description

A kind of rotary kiln

Cross-references to related applications

This disclosure claims the priority of the Chinese patent application with the application number 2020103252495 and the name "a kind of rotary kiln" filed with the Chinese Patent Office on April 23, 2020, the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the technical field of rotary kilns, and in particular to a rotary kiln.

Background technique

Rotary kilns are usually used to make cement, but also to pyrolyze coal or oil shale or biomass. Among them, for coal or biomass materials, due to the low density of the materials, if a large number of heating pipes are installed in the rotary kiln, the heating power will exceed the conveying capacity of the materials in the kiln, so the rotary kiln cannot play a greater role. Potential, resulting in unable to increase production capacity. At present, the method of increasing the inclination of the rotary kiln is used to increase the productivity of the rotary kiln.

The inventor found in the research that the traditional rotary kiln has at least the following shortcomings: too large an inclination will cause excessive load on the supporting wheels of the rotary kiln, so increasing the inclination of the rotary kiln to increase the productivity of the rotary kiln is practical There are problems in production.

Summary of the invention

The present disclosure provides a rotary kiln, which can convey more materials without changing the inclination.

The embodiments of the present disclosure can be implemented as follows:

The embodiment of the present disclosure provides a rotary kiln, which includes a rotary kiln shell, and an inlet and an outlet provided at both ends of the rotary kiln shell, and a heating assembly is provided on the inner cavity of the rotary kiln shell. , A spiral blade group is arranged near the center of the rotary kiln, and the heating component is fixedly connected with the spiral blade group.

The embodiment of the present disclosure provides a rotary kiln. The inner cavity of the rotary kiln is provided with a spiral blade group and a heating assembly at the same time. The spiral blade group is arranged so that when the inclination of the rotary kiln is set within a small range It can also have enough conveying capacity to realize the push of materials. When the heating components inside the rotary kiln have high-intensity thermal power, it can also promote the rapid advancement of coal pyrolysis, complete the rapid pyrolysis of the rotary kiln, and increase production capacity. The use of the rotary kiln provided by the embodiments of the present disclosure can effectively avoid the use of increasing the inclination for the purpose of increasing productivity, thereby effectively alleviating the excessive load of the supporting wheel of the rotary kiln caused by the excessive inclination. problem.

Optionally, the above-mentioned heating assembly includes a plurality of heating tubes, and the plurality of heating tubes are arranged in sequence along the circumferential direction of the rotary kiln shell.

Optionally, along the circumferential direction of the rotary kiln shell, two adjacent heating tubes are arranged at intervals, and the distance between the outer tube walls of the two adjacent heating tubes is at least 20 mm.

The distance between the outer tube walls of two adjacent heating tubes is 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 47mm, 50mm or 60mm.

Optionally, the distance between the walls of two adjacent heating tubes is d1, and 30mm≤d1≤60mm.

Optionally, the distance between the outer tube wall of the heating tube and the peripheral wall of the inner cavity of the rotary kiln shell is at least 20 mm.

The distance between the outer tube wall of the heating tube and the peripheral wall of the inner cavity of the rotary kiln shell is 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 47mm, 50mm or 60mm.

This arrangement is beneficial for materials with a particle size of less than 20mm to fully contact the wall of the heating tube for heat exchange. At the same time, it is also beneficial to install as many heating tubes as possible in the rotary kiln shell to supply more heat to the rotary kiln. If the material particles are large, the distance between the walls of two adjacent heating tubes should also be increased, and the distance between the outer tube wall of the heating tube and the inner cavity peripheral wall of the rotary kiln shell should also be increased adaptively.

Optionally, the distance between the outer tube wall of the heating tube and the peripheral wall of the inner cavity of the rotary kiln shell is d2, and 30mm≤d2≤60mm.

Optionally, the heating assembly includes a multilayer heating tube, and each layer of the heating tube includes a plurality of the heating tubes distributed along the circumference of the rotary kiln shell.

Optionally, the number of layers of the heating tube is 1-4.

By arranging 1-4 layers of heating pipes radially, it is possible to install more heating pipes in the cavity of the rotary kiln shell to increase the heating power of the rotary kiln without causing too many layers and causing inconvenience to installation. problem.

Optionally, the outer diameter of the heating tube is R, 100mm≤R≤400mm.

The outer diameter of the heating tube can be selected according to the diameter of the rotary kiln and the corresponding market specifications, of course, it can also be customized.

Optionally, the rotary kiln further includes a plurality of supporting orifice plates, the supporting orifice plate is provided with inner holes of the supporting orifice plate to sleeve the heating tube; the supporting orifice plate is arranged on the peripheral wall of the inner cavity of the rotary kiln shell, and The peripheral wall of the inner cavity of the rotary kiln shell is fixedly connected; the end of the supporting orifice plate away from the peripheral wall of the inner cavity of the rotary kiln shell is fixedly connected with the spiral blade group.

Optionally, the number of the inner holes of the support orifice plate on each support orifice plate is 1-6.

Optionally, the inner diameter of the inner hole of the supporting orifice plate is 0.5mm-3mm larger than the outer diameter of the heating tube.

The supporting orifice plate is sheathed with a heating tube, and the inner diameter of the inner hole of the supporting orifice plate is 0.5mm-3mm larger than the outer diameter of the heating tube, thereby leaving a gap between the inner hole of the supporting orifice plate and the heating tube. The setting of the gap is to ensure that the heating tube can expand and contract freely under the condition of thermal expansion and contraction. At the same time, leaving a certain gap also helps to improve the convenience of installation. However, the gap should not be too large, because the too large gap will easily cause the heating tube to collide with the inner hole of the supporting orifice plate when the rotary kiln rotates. In other embodiments, if the outer diameter of the heating tube is larger, the gap between the inner hole of the supporting orifice plate and the heating tube can also be increased adaptively.

The support orifice is provided with 1-6 inner holes of the support orifice, which can realize the support of one support orifice corresponding to multiple heating tubes. This arrangement is beneficial to reduce the number of support orifices and make the installation more convenient.

Optionally, the above-mentioned multiple supporting orifice plates are spatially staggered, and the minimum distance between two adjacent supporting orifice plates in the axial direction of the rotary kiln shell is 20 mm.

A plurality of supporting orifice plates are arranged to support the heating tube, and the plurality of supporting orifice plates are arranged in a spatially staggered arrangement. Keeping a distance of at least 20mm between two adjacent supporting orifice plates can prevent the material flow from being obstructed due to the small distance.

Optionally, the above-mentioned plurality of support orifice plates are arranged in sequence along the circumferential direction of the rotary kiln, and along the circumferential direction of the rotary kiln, two adjacent supporting orifice plates are arranged in the axial direction of the rotary kiln. Interval settings.

Optionally, the material of the heating tube is stainless steel, and the stainless steel tube is not easy to bond with the material.

Optionally, along the radial direction of the rotary kiln shell, the height of the spiral blade group is h, 100mm≤h≤800mm.

The height dimension of the spiral blade group can be adaptively adjusted according to the diameter of the rotary kiln and the number of heating tubes.

Optionally, the above-mentioned spiral blade group includes a plurality of spiral blade segments, and the plurality of spiral blade segments are arranged in sequence along the extending direction of the spiral blade group.

Optionally, a plurality of the spiral blade segments are sequentially spaced apart along the extending direction of the spiral blade group, and along the axial direction of the rotary kiln shell, the distance between two adjacent spiral blade segments is d3, 10mm≤d3≤30mm.

The spiral blade group is arranged on the inner side of the inscribed circle formed by the plurality of heating pipes, so that the installation of the spiral blade can smoothly install the spiral blade.

The spiral blade group includes a plurality of non-integrated spiral blade segments, and this arrangement facilitates the manufacture and installation of the spiral blade segments.

Setting a plurality of spiral blade segments to leave gaps can prevent mutual interference caused by the inconsistency of thermal expansion and contraction between the components.

Optionally, a hoop is provided on the heating assembly, and the hoop is fixedly connected to the spiral blade segment.

Optionally, the above-mentioned hoop is welded and fixed to the spiral blade segment.

Compared with the prior art, the beneficial effects of the embodiments of the present disclosure include, for example:

The present disclosure provides a rotary kiln. The rotary kiln includes a rotary kiln shell, and the inner cavity of the rotary kiln shell is provided with a spiral blade group and a heating assembly at the same time. The setting of the spiral blade group can make the rotary kiln be able to effectively push the material when the inclination is small. Under the premise that the rotary kiln heating element has excessively high thermal power, it promotes the rapid advancement of coal pyrolysis and completes the rapid progress of the rotary kiln. Pyrolysis increases production capacity. The use of the rotary kiln provided by the present disclosure can effectively avoid the use of increasing the inclination for the purpose of increasing productivity, thereby effectively alleviating the problem of excessive load on the supporting wheel of the rotary kiln caused by excessive inclination.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show certain embodiments of the present disclosure, and therefore do not It should be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic diagram of the structure of a single-layer heating tube in a rotary kiln shell provided by an embodiment of the disclosure;

Fig. 2 is a left schematic diagram of Fig. 1;

Fig. 3 is a schematic diagram of the structure of a double-layer heating pipe in a rotary kiln shell provided by an embodiment of the disclosure;

Fig. 4 is the left schematic diagram of Fig. 3.

Icon: 10-Rotary kiln; 1-Rotary kiln shell; 2- Inlet; 3- Outlet; 4- Spiral blade group; 41- Spiral blade segment gap; 42- Spiral blade segment; 5- heating tube; 6-support orifice plate; 61-support orifice inner hole; 7-hold hoop; 8-heating component.

Detailed ways

In order to make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments These are a part of the embodiments of the present disclosure, but not all of the embodiments. The components of the embodiments of the present disclosure generally described and illustrated in the drawings herein may be arranged and designed in various different configurations.

Therefore, the following detailed description of the embodiments of the present disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed present disclosure, but merely represents selected embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

It should be noted that similar reference numerals and letters indicate similar items in the following figures. Therefore, once a certain item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

In the description of the present disclosure, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", The azimuth or position relationship indicated by "clockwise", "counterclockwise", etc. is based on the azimuth or position relationship shown in the drawings, or is the azimuth or position relationship usually placed when the product of the invention is used, and is only for the convenience of describing the present invention. The description is disclosed and simplified, rather than indicating or implying that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. In addition, the terms "first", "second", "third", etc. are only used for distinguishing description, and cannot be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging" and other terms do not mean that the component is required to be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", and it does not mean that the structure must be completely horizontal, but can be slightly inclined.

In the description of the present disclosure, it should also be noted that, unless otherwise clearly defined and defined, the terms “setup”, “installation”, “connected”, and “connected” should be interpreted broadly. For example, they may be fixed connections. It can also be detachably connected or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present disclosure can be understood in specific situations.

1 and 2 in combination, this embodiment provides a rotary kiln 10. Optionally, the rotary kiln 10 is a pyrolysis rotary kiln with crushed coal (particle size <20mm). The rotary kiln 10 includes a rotary kiln shell 1. The rotary kiln shell 1 has internal cavities at both ends of the rotary kiln shell, so that the two ends of the rotary kiln shell 1 respectively form the inlet 2 and the outlet 3, and the connection between the inlet 2 and the outlet 3 The direction is the axial direction of the rotary kiln shell 1. A spiral blade group 4 is provided in the inner cavity of the rotary kiln shell 1, and a heating assembly 8 is provided on the peripheral wall of the inner cavity of the rotary kiln shell 1. By setting the spiral blade group 4 in the rotary kiln shell 1, when the inclination of the rotary kiln 10 is set in a small range, for example, when the inclination is less than 5°, it can also have sufficient conveying capacity. , To realize the push of materials.

When in use, the material enters the rotary kiln shell 1 from the feed inlet 2, and the rotary kiln shell 1 and the spiral blade group 4 rotate together around the axis of the rotary kiln shell 1, and the material is spirally pushed under the action of the spiral blade group 4 . The heating assembly 8 is provided on the peripheral wall of the inner cavity to realize the heat exchange of the material.

In this embodiment, the outer diameter of the rotary kiln shell 1 is 4.2 m, and the inner diameter (including the thermal insulation layer) of the rotary kiln shell 1 is 3.8 m.

1 and 2 in combination, in this embodiment, the heating assembly 8 includes a plurality of heating tubes 5, the plurality of heating tubes 5 are arranged in sequence along the circumference of the rotary kiln shell 1, the plurality of heating tubes 5 around the rotary kiln The circumferential array of the casing 1 forms a layer of heating pipes. In the first type of rotary kiln 10, the heating tube 5 is arranged in a single layer. It can be understood that in other embodiments, the number of layers of the heating tube 5 can also be set according to requirements, for example, set to 2, 3, or 4 layers. Specifically, the number of heating tubes 5 is 48, and the specification is Φ203 mm.

The structure of the rotary kiln 10 provided by the embodiments of the present disclosure can adaptively set the number of heating pipes 5, and the number of heating pipes 5 does not affect the conveying capacity of the materials in the rotary kiln, so that both the rapid pyrolysis of the rotary kiln and the Increase production capacity.

In this embodiment, 48 heating tubes 5 are uniformly distributed on the inner cavity peripheral wall of the rotary kiln shell 1 in a ring shape, and the length of each heating tube 5 is the same.

Optionally, the distance between the outer tube wall of the heating tube 5 and the peripheral wall of the inner cavity of the rotary kiln shell 1 is at least 20 mm. In this embodiment, the distance d2 between the outer wall of the heating tube 5 and the peripheral wall of the inner cavity of the rotary kiln shell 1 is d2=27mm. It is understandable that in other embodiments, the outer tube of the heating tube 5 can also be provided according to requirements. The distance between the wall and the peripheral wall of the inner cavity of the rotary kiln shell 1 is, for example, 20 mm, 25 mm or 28 mm.

Optionally, along the circumferential direction of the rotary kiln shell 1, the distance between the outer tube walls of two adjacent heating tubes 5 is at least 20 mm. In this embodiment, the distance d1 between the outer tube walls of two adjacent heating tubes 5 is 27 mm. It is understandable that in other embodiments, the distance between the outer tube walls of adjacent heating tubes 5 can be adjusted adaptively according to actual needs, and the installation can be set to 20 mm, 25 mm or 28 mm, for example.

1 and 2 in combination, in this embodiment, the rotary kiln 10 further includes a plurality of supporting orifice plates 6, the supporting orifice plate 6 is fixedly connected to the rotary kiln shell 1, and the heating tube 5 is connected to the supporting orifice plate 6 In order to realize the connection with the rotary kiln shell 1, and realize the support of the heating tube 5 through the supporting orifice 6. A plurality of supporting orifice plates 6 are sequentially arranged in the circumferential direction of the rotary kiln shell 1, so that the plurality of supporting orifice plates 6 can support the plurality of heating pipes 5 distributed in the circumference.

At the same time, along the circumferential direction of the rotary kiln shell 1, two adjacent support orifice plates 6 are arranged at intervals in the axial direction of the rotary kiln shell 1. Spiral setting around the wall. Specifically, the supporting orifice 6 has a fan ring shape, and one end of the radially outer side of the supporting orifice 6 is fixedly connected to the peripheral wall of the inner cavity of the rotary kiln shell 1. Optionally, the supporting orifice 6 and the peripheral wall of the inner cavity of the rotary kiln shell 1 are fixed by welding. It can be understood that, in other embodiments, the supporting orifice plate 6 may also be fixedly connected to the peripheral wall of the inner cavity of the rotary kiln shell 1 in other ways, for example, fixed by bolts.

Optionally, the minimum displacement between two adjacent support orifice plates 6 in the axial direction of the rotary kiln shell 1 is 20 mm. In other words, the distance between two adjacent support orifice plates 6 corresponds to the minimum distance in the axial direction of the rotary kiln shell 1 of 20 mm. In this embodiment, the distance between two adjacent supporting orifice plates 6 in the axial direction of the rotary kiln shell 1 is 630 mm. This arrangement can prevent the flow of crushed coal materials from being blocked by the supporting orifice plates 6. It is understandable that in other embodiments, the distance between two adjacent support orifice plates 6 in the axial direction of the rotary kiln shell 1 can also be set according to requirements, for example, set to 20mm, 100mm, 400mm or 600mm.

Optionally, each support orifice 6 is provided with a support orifice inner hole 61 so that the support orifice 6 is sleeved with a heating tube 5, that is, the heating tube 5 is penetrated through the support orifice inner hole 61. Optionally, each supporting orifice plate 6 is provided with a plurality of supporting orifice inner holes 61, so that one supporting orifice plate 6 can support multiple heating tubes 5. In this embodiment, each supporting orifice plate 6 is provided with three supporting orifice inner holes 61, so that each supporting orifice plate 6 can support three heating tubes 5. It can be understood that in other embodiments, the number of inner holes 61 in the support orifice plate 6 can also be set according to requirements, for example, set to 1, 2, 4, 5 or 6.

Optionally, the inner diameter of the inner hole 61 of the supporting orifice plate is larger than the outer diameter of the heating tube 5, and the inner diameter of the inner hole 61 of the supporting orifice plate is larger than the outer diameter of the heating tube 5 by 0.5 mm to 3 mm. Specifically, the inner diameter of the inner hole 61 of the supporting orifice plate is Φ205 mm, that is, the inner diameter of the inner hole 61 of the supporting orifice plate is larger than the outer diameter of the heating tube 5 by 2 mm. Therefore, the heating tube 5 with an outer diameter of Φ203mm can be guided and moved in the inner hole 61 of the supporting orifice plate without being restricted by thermal expansion and contraction. Understandably, in other embodiments, the difference between the inner diameter of the inner hole 61 of the supporting orifice plate and the outer diameter of the heating tube 5 can also be specifically set according to the outer diameter of the heating tube 5, for example, set to 0.5mm, 1mm or 3mm. .

1 and 2 in combination, in this embodiment, the spiral blade group 4 includes a plurality of spiral blade segments 42. FIG. 1 shows the structure of a part of the spiral blade group 4 inside the rotary kiln shell 1. The spiral blade segments 42 are sequentially arranged along the extending direction of the spiral blade group 4. Specifically, the spiral blade segment 42 is fixedly connected to the radially outer end of the supporting orifice plate 6, so that along the radial direction of the rotary kiln shell 1, the heating tube 5 is located between the rotary kiln shell 1 and the spiral blade segment 42.

Optionally, a plurality of spiral blade segments 42 are arranged at intervals along the extending direction of the spiral blade group 4 in sequence, and a spiral blade segment gap 41 is formed between two adjacent spiral blade segments 42. The provision of a plurality of helical blade segments 42 to leave gaps can prevent mutual interference caused by the inconsistency of thermal expansion and contraction between the components. The size of the spiral blade segment gap 41 is the distance between two adjacent spiral blade segments 42. Optionally, the distance between two adjacent spiral blade segments 42 is d3, and 10mm≤d3≤30mm. In this embodiment, d3=10mm. It is understandable that in other embodiments, the size of the spiral blade segment gap 41 can also be set according to requirements, for example, set to 20 mm or 30 mm.

In this embodiment, along the radial direction of the rotary kiln shell 1, the height of the spiral blade group 4 is h, 100mm≤h≤800mm. That is, the height of the spiral blade group 4 is the size of the spiral blade group 4 along the radial direction of the rotary kiln shell 1. Optionally, the height of the spiral blade group 4 is h=200mm. It is understood that in other embodiments, the height of the spiral blade group 4 can also be set according to requirements, for example, set to 100mm, 400mm, or 800mm.

In this embodiment, the material of the spiral blade segment 42 and the material of the heating tube 5 are both stainless steel. The stainless steel material is not easy to bond with the material, which is beneficial to improve the delivery efficiency of the material. In addition, in other embodiments, the material of the spiral blade segment 42 may also be titanium alloy or the like.

Optionally, one end of the spiral blade segment and the supporting orifice plate 6 is fixed by welding. In order to improve the welding strength, a welding rib can be optionally added.

When in use, the material is fed from the feed port 2. Under the action of the spiral blade group 4, the material is delivered step by step from the previous spiral blade segment 42 to the next spiral blade segment 42 along the spiral blade group 4, and is realized by the heating tube 5. Heat exchange with the material, and finally the material is discharged from the discharge port 3 of the rotary kiln.

3 and 4 in combination, this embodiment also provides a rotary kiln 10. Optionally, the rotary kiln 10 is a pyrolysis rotary kiln with crushed coal (particle size <30mm). The rotary kiln 10 includes a rotary kiln shell 1. The rotary kiln shell 1 has internal cavities at both ends of the rotary kiln shell, so that the two ends of the rotary kiln shell 1 respectively form the inlet 2 and the outlet 3, and the connection between the inlet 2 and the outlet 3 The direction is the axial direction of the rotary kiln shell 1. A spiral blade group 4 is arranged in the inner cavity of the rotary kiln shell 1, and a heating assembly 8 is arranged on the peripheral wall of the inner cavity of the rotary kiln shell 1, and the heating assembly 8 includes a plurality of heating tubes 5. As shown in FIG.

In this embodiment, the outer diameter of the rotary kiln shell 1 is 7.2 m, and the inner diameter (including the thermal insulation layer) of the rotary kiln shell 1 is 6.8 m.

In this embodiment, referring to Figures 3 and 4, the heating tube 5 is a double-layered arrangement, in which the outer layer is composed of 46 heating tubes 5 with a specification of Φ394mm, and the inner layer is composed of 46 heating tubes 5 with a specification of Φ325mm. composition.

In this embodiment, the outer layer includes 46 heating tubes 5 with an outer diameter of Φ394mm, and the 46 heating tubes 5 are uniformly distributed on the inner cavity peripheral wall of the rotary kiln shell 1 in a ring shape; the inner layer includes 46 heating tubes 5 with outer diameters The heating tubes 5 with a diameter of 325 mm, the 46 heating tubes 5 are uniformly distributed on the radial inner side of the outer heating tube 5 in a ring shape.

Optionally, the distance between the outer tube wall of the heating tube 5 and the peripheral wall of the inner cavity of the rotary kiln shell 1 is 43 mm, and the distance between the outer tube walls of two adjacent heating tubes 5 is greater than 35 mm. In this embodiment, the distance between the outer tube walls of two adjacent heating tubes 5 is 38mm. Specifically, two adjacent heating tubes 5 refer to: in each layer of heating tubes 5, the distance between the outer wall of the rotary kiln shell 1 Two adjacent heating tubes 5; and, of the two adjacent heating tubes 5, two heating tubes adjacent to each other in the radial direction of the rotary kiln shell 1. Understandably, in other embodiments, the distance between the outer tube walls of two adjacent heating tubes 5 can also be set according to requirements, for example, set to 36mm, 40mm or 43mm.

A plurality of supporting orifice plates 6 are provided on the heating tube 5, and the plurality of supporting orifice plates 6 are all fixedly connected to the rotary kiln shell 1 to support the heating tube 5. Please refer to Figure 3, the support orifice 6 and the inner side of the rotary kiln shell 1 are fixed by welding. A plurality of supporting orifice plates 6 are spirally distributed on the peripheral wall of the inner cavity of the rotary kiln shell 1. The distance between two adjacent supporting orifice plates 6 in the axial direction of the rotary kiln shell 1 is 5000 mm, which can prevent the flow of crushed coal materials from being blocked by the supporting orifice plates 6.

Each supporting orifice 6 is provided with an inner hole 61 of the supporting orifice, so that the supporting orifice 6 is sleeved with the heating tube 5. In this embodiment, each supporting orifice plate 6 is provided with three supporting orifice plate inner holes 61 with an inner diameter of Φ397 mm and three supporting orifice plate inner holes 61 with an inner diameter of Φ327.5 mm. The three outer heating tubes 5 are provided with three supporting orifice holes 61 with an inner diameter of Φ397mm one by one, and the three inner heating tubes 5 are provided with three supporting orifices with an inner diameter of Φ327.5mm one by one. The inner hole 61, so that the heating tube 5 with an outer diameter of Φ394mm can have an inner diameter of

The inner hole 61 of the supporting orifice plate is guided and moved, and the heating tube with an outer diameter of Φ325mm can be guided and moved by the inner diameter of the supporting orifice 61 of the inner diameter of Φ327.5mm, and is not restricted by thermal expansion and contraction.

The spiral blade group 4 includes a plurality of spiral blade segments 42. FIG. 3 shows the structure of a part of the spiral blade group 4 inside the rotary kiln shell 1. Two adjacent spiral blade segments 42 are arranged at intervals, so that a spiral blade segment gap 41 is formed between the two adjacent spiral blade segments 42. A gap is provided between a plurality of spiral blade segments 42 to prevent mutual interference caused by the inconsistency of thermal expansion and contraction between the components. In this embodiment, the size of the spiral blade segment gap 41 is 30 mm.

In this embodiment, the height of the spiral blade group 4 is 800 mm. In this embodiment, the material of the spiral blade segment 42 and the material of the heating tube 5 are both stainless steel. The stainless steel material is not easy to bond with the material, which is beneficial to improve the delivery efficiency of the material. In addition, in other embodiments, the material of the spiral blade segment 42 may also be titanium alloy or the like.

Optionally, a hoop 7 is provided on the heating assembly 8, specifically, a hoop 7 is provided on at least part of the heating tube 5. In this embodiment, a hoop 7 is provided on part of the heating tube 5 in the inner layer, and the hoop 7 is welded and fixed to the spiral blade segment 42.

During installation, the heating tube 5 with an outer diameter of Φ325mm is clamped with the hoop 7 first, and then the spiral blade segment 42 and the hoop 7 are welded together.

Optionally, in order to increase the welding strength, a welding rib may be added.

The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present disclosure. All should be covered within the protection scope of this disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Industrial applicability

In summary, the present disclosure provides a rotary kiln, which can transport more materials without changing the inclination.

Claims

A rotary kiln, which comprises a rotary kiln shell, and an inlet and a discharge port provided at both ends of the rotary kiln shell, characterized in that the inner cavity peripheral wall of the rotary kiln shell is provided with heating The assembly is provided with a spiral blade group close to the central side of the rotary kiln, and the heating assembly is fixedly connected with the spiral blade group.
The rotary kiln according to claim 1, wherein the heating assembly comprises a plurality of heating tubes, and the plurality of heating tubes are arranged in sequence along the circumferential direction of the rotary kiln shell.
The rotary kiln according to claim 2, characterized in that, along the circumferential direction of the rotary kiln shell, two adjacent heating pipes are arranged at intervals, and the outer pipes of the two adjacent heating pipes The wall spacing is at least 20mm.
The rotary kiln according to claim 3, wherein the distance between the outer tube walls of two adjacent heating tubes is d1, and 30mm≤d1≤60mm.
The rotary kiln according to any one of claims 2 to 4, wherein the distance between the outer tube wall of the heating tube and the inner cavity peripheral wall of the rotary kiln shell is at least 20 mm.
The rotary kiln according to claim 5, wherein the distance between the outer tube wall of the heating tube and the inner cavity peripheral wall of the rotary kiln shell is d2, and 30mm≤d2≤60mm.
The rotary kiln according to any one of claims 1-6, wherein the heating assembly comprises a multi-layer heating tube, and each layer of the heating tube comprises a plurality of heating tubes distributed along the circumference of the rotary kiln shell. The heating tube.
The rotary kiln according to any one of claims 2-7, wherein the outer diameter of the heating tube is R, 100mm≤R≤400mm.
The rotary kiln according to any one of claims 2-8, wherein the rotary kiln further comprises a plurality of supporting orifice plates, and the supporting orifice plates are provided with inner holes of the supporting orifice plates to cover the Heating pipe; the supporting orifice is arranged on the peripheral wall of the inner cavity of the rotary kiln shell, and is fixedly connected with the inner cavity of the rotary kiln shell; the supporting orifice is away from the inner cavity of the rotary kiln shell One end of the cavity peripheral wall is fixedly connected with the spiral blade group.
The rotary kiln according to claim 9, wherein the number of the inner holes of the supporting orifice plate on each of the supporting orifice plates is 1-6.
The rotary kiln according to claim 9, wherein the inner diameter of the inner hole of the supporting orifice plate is 0.5mm-3mm larger than the outer diameter of the heating tube.
The rotary kiln according to claim 10, characterized in that a plurality of said supporting orifice plates are spatially staggered, and the minimum distance between two adjacent supporting orifice plates in the axial direction of the rotary kiln shell is 20mm .
The rotary kiln according to claim 12, wherein a plurality of the supporting orifice plates are arranged in sequence along the circumferential direction of the rotary kiln, and along the circumferential direction of the rotary kiln shell, there are two adjacent The supporting orifice plates are arranged at intervals in the axial direction of the rotary kiln shell.
The rotary kiln according to any one of claims 1-13, characterized in that, along the radial direction of the rotary kiln shell, the height of the spiral blade group is h, 100mm≤h≤800mm.
The rotary kiln according to any one of claims 1-14, wherein the spiral blade group includes a plurality of spiral blade segments, and the plurality of spiral blade segments are sequentially arranged along the extending direction of the spiral blade group.
The rotary kiln according to claim 15, wherein a plurality of the spiral blade segments are sequentially spaced apart along the extending direction of the spiral blade group, and two adjacent ones are arranged along the axial direction of the rotary kiln shell. The distance between the spiral blade segments is d3, and 10mm≤d3≤30mm.
The rotary kiln according to claim 15 or 16, wherein a hoop is provided on the heating assembly, and the hoop is welded and fixed to the spiral blade segment.