Internal heating type rotary kiln
By installing a clamping cylinder and flexible connection components outside the internally heated rotary kiln, the problems of metal fatigue and high energy consumption at high temperatures are solved, achieving the effect of long service life and low energy consumption at high temperatures.
Patent Information
- Application Number
- CN202423130919.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2034-12-18
AI Technical Summary
Internally heated rotary kilns are prone to metal fatigue, softening, bending, and deformation at high temperatures, resulting in short lifespans, high energy consumption, high shell temperatures, low thermal efficiency, and environmental pollution.
An inner heating rotary kiln is provided with an outer clamping cylinder made of refractory and heat-insulating material. A cavity is formed between the inner and outer cylinders. The clamping cylinder is connected to the outer cylinder through a flexible joint assembly to provide expansion space and reduce heat loss.
It improves the operating temperature and lifespan of internally heated rotary kilns, reduces energy consumption, and minimizes energy waste and environmental pollution.
Smart Images
Figure CN223636606U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to rotary kiln equipment technical field especially relates to a internal heating type rotary kiln. BACKGROUND
[0002] Rotary kiln equipment refers to the rotary calcining kiln (commonly known as rotary kiln), belongs to building material equipment class, has obtained the extensive application in metallurgy, chemical industry, environmental protection field. According to the different heating mode, rotary kiln equipment is divided into internal heating type kiln and external heating type kiln. Usually, internal heating type rotary kiln cylinder interior is without firebrick and other thermal insulation material, and cylinder material is stainless steel material, and it will not pollute the material in cylinder. Therefore, the product purity is higher for the material calcination often adopts internal heating type rotary kiln, for example, the calcination when rare earth carbonate is calcined to generate oxide.
[0003] But again due to internal heating type rotary kiln basically adopts natural gas as heat source to heat material, when the rotary kiln calcination temperature is too high, high-temperature section cylinder is easy to have metal fatigue, softening, bending, deformation and other problems, makes the kiln body life significantly reduces, and high-temperature section outer surface has no effective thermal insulation and heat insulation measures, makes the shell temperature of internal heating type rotary kiln higher, and heat efficiency reduces, and energy is wasted seriously and pollutes the environment.
[0004] Therefore, it is urgent to propose an internal heating type rotary kiln to solve the above problems. UTILITY MODEL CONTENTS
[0005] The utility model is aimed at providing an internal heating type rotary kiln, which has high service temperature, long service life and low energy consumption.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] The internal heating type rotary kiln comprises:
[0008] An inner cylinder, in which the material can be calcined;
[0009] An outer cylinder, which is sleeved on the inner cylinder, and a containing cavity is formed between the inner side wall of the outer cylinder and the outer side wall of the inner cylinder;
[0010] A clamping cylinder, which is located in the containing cavity and is made of refractory insulation material.
[0011] As an optional technical solution of the internal heating type rotary kiln, the clamping cylinder is formed by pouring the castable into the containing cavity.
[0012] As an optional technical scheme of the internal heating rotary kiln, the inner side wall and the outer side wall of the casted clamping cylinder are connected with the outer side wall of the inner cylinder and the inner side wall of the outer cylinder respectively, and the inner cylinder and the outer cylinder are coaxially arranged.
[0013] As an optional technical scheme of the internal heating rotary kiln, the internal heating rotary kiln further comprises a plurality of groups of soft connection assemblies, the soft connection assemblies are used for soft connecting the casted clamping cylinder and the outer cylinder, and the plurality of groups of soft connection assemblies are uniformly distributed along the outer cylinder in the axial direction.
[0014] As an optional technical scheme of the internal heating rotary kiln, the interval between two adjacent groups of soft connection assemblies along the axial direction of the outer cylinder ranges from 0.5 m to 2 m.
[0015] As an optional technical scheme of the internal heating rotary kiln, a plurality of soft connection assemblies in the same group are uniformly distributed along the inner periphery of the outer cylinder in the axial direction of the outer cylinder.
[0016] As an optional technical scheme of the internal heating rotary kiln, the number of soft connection assemblies in the same group along the axial direction of the outer cylinder ranges from 2 to 8.
[0017] As an optional technical scheme of the internal heating rotary kiln, the soft connection assembly comprises a fixing frame, an elastic element and a bolt, the fixing frame is fixed to the outer side wall of the outer cylinder, the bolt is sequentially arranged through the fixing frame, the outer cylinder and the outer side wall of the clamping cylinder, and the two ends of the elastic element are respectively abutted against the fixing frame and the outer side wall of the outer cylinder.
[0018] As an optional technical scheme of the internal heating rotary kiln, the elastic element is a spring, and the spring is sleeved on the bolt.
[0019] As an optional technical scheme of the internal heating rotary kiln, along the circumferential direction of the inner cylinder and the outer cylinder, the casted clamping cylinder comprises a plurality of first segments and a plurality of second segments, the plurality of first segments and the plurality of second segments are sequentially and alternately arranged, the number of the second segments corresponds to the number of the bolts in each group of soft connection assemblies, and the bolt is sequentially arranged through the fixing frame, the outer cylinder and the second segment.
[0020] The internal heating rotary kiln has the following beneficial effects:
[0021] The inner hot type rotary kiln comprises an inner cylinder, an outer cylinder and a clamping cylinder. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 is a structural schematic view of the inner hot type rotary kiln provided by the utility model embodiment;
[0023] Figure 2 is Figure 1 A-A direction sectional view of
[0024] Figure 3 is Figure 1 enlarged view at B.
[0025] In the drawings:
[0026] 100, inner cylinder; 200, outer cylinder; 300, clamping cylinder; 400, soft joint assembly; 410, fixing frame; 420, elastic member; 430, bolt. DETAILED DESCRIPTION
[0027] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.
[0028] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0029] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature, which can include the first and second features directly contact, or can include the first and second features are not directly contact but contact through another feature between them.Moreover, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height.The first feature "under", "below" and "under" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.
[0030] In the description of the embodiment, the terms "upper", "lower", "right", "left", "horizontal", "vertical", and other orientation or position relations are based on the orientation or position relations shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0031] The internal heating type rotary kiln provided by the embodiment has high use temperature, long service life and low energy consumption.
[0032] Specifically as shown in Figure 1 and Figure 2 The internal heating type rotary kiln comprises an inner cylinder 100, an outer cylinder 200 and a clamping cylinder 300. The material can be calcined in the inner cylinder 100, and the outer cylinder 200 is sleeved outside the inner cylinder 100. The inner side wall of the outer cylinder 200 and the outer side wall of the inner cylinder 100 form a containing cavity, the clamping cylinder 300 is located in the containing cavity, and the clamping cylinder 300 is made of refractory insulation material.
[0033] Based on the above design, the outer cylinder 200 is sleeved outside the inner cylinder 100, the material can be calcined in the inner cylinder 100, and the outer cylinder 200 can protect the inner cylinder 100. The inner side wall of the outer cylinder 200 and the outer side wall of the inner cylinder 100 form a containing cavity, the clamping cylinder 300 is located in the containing cavity, can support and protect the inner cylinder 100, improve the use temperature and service life of the internal heating type rotary kiln, and the clamping cylinder 300 is made of refractory insulation material, which can play a heat preservation and insulation role, and reduce the energy consumption of the internal heating type rotary kiln.
[0034] In the embodiment, the inner cylinder 100 and the outer cylinder 200 of the internal heating type rotary kiln are made of stainless steel material. The stainless steel material type includes but is not limited to 304 stainless steel, 310 stainless steel, 310S stainless steel, 316L stainless steel, 314 stainless steel and other high-temperature resistant stainless steel. Of course, the outer cylinder 200 can also be made of carbon steel and other medium-temperature resistant stainless steel.
[0035] Furthermore, the clamping cylinder 300 is formed by pouring the castable into the receiving cavity. Specifically, a high-powered mixer is used to mix the castable into a slurry, which is then vibrated and compacted before being poured into shape. Vibrating filler is used during pouring to ensure uniform and dense pouring.
[0036] Of course, the castable is a refractory and heat-insulating material. For example, the refractory and heat-insulating material can be alumina cement castable, self-leveling castable, low-cement castable, phosphate castable, mullite castable, anti-dry slag castable, high-alumina waste powder, clay powder, high-temperature cement, etc.
[0037] Furthermore, in order to increase the supporting performance of the cast clamping cylinder 300, the inner and outer sidewalls of the cast clamping cylinder 300 are connected to the outer sidewall of the inner cylinder 100 and the inner sidewall of the outer cylinder 200, respectively. The inner cylinder 100 and the outer cylinder 200 are coaxially rotated to ensure that the inner cylinder 100 and the outer cylinder 200 rotate coaxially without deviation.
[0038] In this embodiment, considering the thermal expansion of the stainless steel inner cylinder 100, such as... Figure 2 and Figure 3 As shown, the internally heated rotary kiln also includes multiple sets of flexible connection components 400. These flexible connection components 400 connect the cast-formed clamping cylinder 300 to the outer cylinder 200. This connection provides radially outward expansion space for the inner cylinder 100. The multiple sets of flexible connection components 400 are evenly distributed along the axial direction of the outer cylinder 200, improving the uniformity of the expansion space along the axial direction of the outer cylinder 200.
[0039] Optionally, the spacing between two adjacent sets of flexible connector assemblies 400 along the axial direction of the outer cylinder 200 ranges from 0.5m to 2m. For example, it can be 0.5m, 1.0m, 1.25m, 1.5m, or 2m, etc.
[0040] Optionally, along the axial direction of the outer cylinder 200, multiple flexible connection components 400 in the same group are evenly distributed at intervals along the inner circumference of the outer cylinder 200, thereby improving the uniformity of the expansion space along the circumference of the outer cylinder 200 and further improving the stability of the internally heated rotary kiln.
[0041] Furthermore, along the axial direction of the outer cylinder 200, the number of flexible connector assemblies 400 in the same group ranges from 2 to 8. For example, there can be 2, 3, 4, 6, or 8.
[0042] Optionally, the soft joint assembly 400 comprises a fixing frame 410, an elastic member 420 and a bolt 430, the fixing frame 410 is fixed to the outer lateral wall of the outer cylinder body 200, the bolt 430 is sequentially arranged through the fixing frame 410 and the outer cylinder body 200 and abuts against the outer lateral wall of the clamped cylinder body 300, and the two ends of the elastic member 420 abut against the outer lateral wall of the fixing frame 410 and the outer cylinder body 200 respectively. By using the soft joint assembly 400 for connection, sufficient thermal expansion space can be reserved for the inner cylinder body 100; secondly, the cost of the inner-heating rotary kiln can be reduced, and the installation is convenient; meanwhile, the coaxial rotation of the inner cylinder body 100 and the outer cylinder body 200 can be ensured.
[0043] In the embodiment, the elastic member 420 is a spring, and the spring is sleeved on the bolt 430.
[0044] The inner cylinder body 100 is heated to expand radially outward, pushes the clamped cylinder body 300 to move away from the inner cylinder body 100, the clamped cylinder body 300 pushes the outer cylinder body 200 to expand radially outward, the spring is compressed, and the avoidance space is provided for the inner cylinder body 100 and the outer cylinder body 200, and the inner cylinder body 100 returns to the original shape after cooling, and the spring elasticity is recovered.
[0045] Along the circumferential direction of the inner cylinder body 100 and the outer cylinder body 200, the clamped cylinder body 300 formed by pouring comprises a plurality of first segments and a plurality of second segments, the plurality of first segments and the plurality of second segments are arranged alternately and separately, the number of the second segments corresponds to the number of the bolts 430 in each group of the soft joint assembly 400, and the bolt 430 is sequentially arranged through the fixing frame 410 and the outer cylinder body 200 and abuts against the second segment.
[0046] The specific connection process of the clamped cylinder body 300 and the bolt 430 of the inner-heating rotary kiln is as follows: first, the pouring space (i.e. the accommodating cavity) is separated by combining the inner cylinder body 100 and the mold, one side of the bolt 430 is placed in the pouring space, and the bolt 430 is connected with the pouring material.
[0047] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation to the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be made without departing from the protection scope of the utility model. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.
Claims
1. An internally heated rotary kiln, characterized by, include: The inner cylinder (100) allows the material to be calcined within it; An outer cylinder (200) is fitted over the inner cylinder (100), and a receiving cavity is formed between the inner sidewall of the outer cylinder (200) and the outer sidewall of the inner cylinder (100). A clamping cylinder (300) is located in the receiving cavity, and the clamping cylinder (300) is made of refractory and heat-insulating material.
2. The internally heated rotary kiln of claim 1, wherein, The clamping cylinder (300) is formed by casting refractory material into the receiving cavity.
3. The internally heated rotary kiln of claim 2, wherein, The inner and outer walls of the cast clamping cylinder (300) are connected to the outer wall of the inner cylinder (100) and the inner wall of the outer cylinder (200), respectively, and the inner cylinder (100) and the outer cylinder (200) are coaxially rotatably arranged.
4. The internally heated rotary kiln of claim 3, wherein, The internally heated rotary kiln also includes multiple sets of flexible connection components (400), which connect the cast clamping cylinder (300) to the outer cylinder (200) in a flexible manner. The multiple sets of flexible connection components (400) are evenly distributed at intervals along the axial direction of the outer cylinder (200).
5. The internally heated rotary kiln of claim 4, wherein, Along the axial direction of the outer cylinder (200), the spacing between two adjacent sets of flexible connector assemblies (400) ranges from 0.5m to 2m.
6. The internally heated rotary kiln of claim 4, wherein, Along the axial direction of the outer cylinder (200), a plurality of the flexible connector assemblies (400) in the same group are evenly distributed at intervals along the inner circumferential direction of the outer cylinder (200).
7. The internally heated rotary kiln of claim 6, wherein, Along the axial direction of the outer cylinder (200), the number of flexible connector assemblies (400) in the same group ranges from 2 to 8.
8. The internally heated rotary kiln of claim 4, wherein, The flexible connector assembly (400) includes a fixing frame (410), an elastic element (420), and a bolt (430). The fixing frame (410) is fixed to the outer wall of the outer cylinder (200). The bolt (430) passes through the fixing frame (410) and the outer cylinder (200) in sequence and abuts against the outer wall of the clamping cylinder (300). The two ends of the elastic element (420) abut against the fixing frame (410) and the outer wall of the outer cylinder (200), respectively.
9. The internally heated rotary kiln of claim 8, wherein, The elastic element (420) is a spring, which is sleeved on the bolt (430).
10. The internally heated rotary kiln of claim 8, wherein, Along the circumference of the inner cylinder (100) and the outer cylinder (200), the cast clamping cylinder (300) includes a plurality of first sections and a plurality of second sections, which are arranged alternately in sequence. The number of second sections corresponds one-to-one with the number of bolts (430) in each set of flexible connectors (400). The bolts (430) pass through the fixing frame (410) and the outer cylinder (200) in sequence and abut against the second section.