Mounting structure of rotary kiln head waste heat utilization recovery pipe

Abstract

The utility model discloses an installation structure of a rotary kiln head waste heat utilization recycling pipe, and belongs to the technical field of rotary kilns. An installation structure of a rotary kiln head waste heat utilization recycling pipe comprises a clamp which is arranged on the outer wall of the recycling pipe in a sleeving mode, the clamp is of a fan-shaped structure, the opening direction of the clamp faces the kiln tail of a rotary kiln, the radial size of the inner circle of the clamp corresponds to the outer diameter size of the recycling pipe, the central angle of the clamp is larger than 180 degrees, and the clamping hoop is of a fan-shaped structure. A vertical connecting rod is arranged at the top of the hoop; the device has the advantages of being high in stability and increasing the contact area between the recovery pipe and hot air.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary kilns, in particular to an installation structure of a waste heat utilization and recovery pipe at the head of a rotary kiln. Background Art

[0002] The alumina rotary kiln is a common industrial heat treatment equipment, mainly used for the production of kaolin and the calcination of alumina. It is a rotating cylindrical furnace body, usually composed of a furnace body, a driving device, a supporting device, a sealing device, a burner and a feeding and discharging device, etc.

[0003] Since the raw materials are discharged at a high temperature by the discharging device located at the head of the rotary kiln after being calcined in the furnace body and still have a large amount of waste heat, they must wait to be cooled before being stored in the warehouse. If cooled naturally, first, the cooling efficiency is low, and second, the waste heat is seriously wasted. Therefore, in the prior art, a waste heat utilization and recovery pipe is often installed in the discharging device. The waste heat utilization and recovery pipe introduces air, and after the air is heated by the waste heat, it is introduced into the burner and mixed with natural gas for combustion to recover and utilize the waste heat.

[0004] When the existing waste heat utilization and recovery pipe is installed, a traditional hoop is mostly used to directly fix the recovery pipe on the inner wall of the discharging device. The recovery pipe almost fits the inner wall of the discharging device, which is not conducive to efficient heat exchange. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problem that the waste heat utilization and recovery pipe in the discharging device of the existing rotary kiln is installed and fixed by a traditional hoop, which is not conducive to improving the heat exchange efficiency of the recovery pipe, and to propose an installation structure of a waste heat utilization and recovery pipe at the head of a rotary kiln.

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

[0007] An installation structure of a waste heat utilization and recovery pipe at the head of a rotary kiln includes a clamp sleeved on the outer wall of the recovery pipe. The clamp is in a sector ring structure, the opening direction of the clamp faces the tail of the rotary kiln, the radial dimension of the inner circle of the clamp corresponds to the outer diameter dimension of the recovery pipe, the central angle of the clamp is greater than 180 degrees, and a vertical connecting rod is arranged at the top of the clamp.

[0008] Further, the cross section of the clamp is wide in the middle and narrow at both ends, and the end of the clamp close to the recovery pipe is in a V shape.

[0009] Further, there are multiple clamps, and the multiple clamps are evenly spaced along the axial direction of the recovery pipe.

[0010] Further, a horizontal connecting rod is arranged at the top of the clamp, and the top of the horizontal connecting rod is connected to the bottom of the vertical connecting rod.

[0011] Furthermore, a longitudinal connecting rod is provided at the top of the vertical connecting rod, and the longitudinal connecting rod is arranged along the axial direction of the rotary kiln body.

[0012] Furthermore, the central angle of the clamp is between 200 degrees and 270 degrees.

[0013] Compared with the prior art, the present utility model provides an installation structure for a waste heat utilization and recovery pipe at the head of a rotary kiln, having the following beneficial effects:

[0014] In the installation structure for a waste heat utilization and recovery pipe at the head of a rotary kiln of the present utility model, during use, the clamp is sleeved on the recovery pipe, and the vertical connecting rod is embedded and fixed on the inner wall of the discharging device. Through the vertical connecting rod and the clamp, a gap is maintained between the recovery pipe and the inner wall of the discharging device. Hot gas passes through the surface of the recovery pipe from the inside and outside of the recovery pipe, increasing the contact area between the recovery pipe and the hot gas in the discharging device, thereby improving the heat exchange efficiency.

[0015] Other advantages, objectives, and features of the present utility model will be described to some extent in the subsequent description; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present utility model;

[0017] Figure 2 is a front view schematic diagram of the overall structure of the present utility model;

[0018] Figure 3 is a right view schematic diagram of the overall structure of the present utility model;

[0019] Figure 4 is a schematic diagram of the cross-sectional structure of the clamp of the present utility model;

[0020] Figure 5 is a schematic diagram of the installation effect of the present structure of the present utility model;

[0021] Figure 6 is of the present utility model Figure 5 magnified schematic diagram of the structure of part A.

[0022] In the figure:

[0023] 1, clamp; 2, transverse connecting rod; 3, vertical connecting rod; 4, longitudinal connecting rod; 5, recovery pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0025] Referring to Figures 1-6 , an installation structure of a waste heat utilization and recovery pipe at the head of a rotary kiln of the present utility model includes a clamp 1 sleeved on the outer wall of the recovery pipe 5. The recovery pipe 5 in this application is a multi-row pipe structure, that is, multiple recovery pipes 5 are arranged along the axis direction of the kiln body. As Figure 5 shown, the middle and upper parts of the recovery pipe 5 are in a structure similar to a circle, and this part of the structure corresponds to the internal shape of the discharging device. The heights of the bottoms of the multiple recovery pipes 5 gradually decrease from the kiln tail to the kiln head direction of the kiln body to adapt to the discharging slope of the discharging device. During installation, the middle and upper parts of the recovery pipe 5 are located inside the discharging device and are kept at an interval from the inner wall of the discharging device, while the bottom of the recovery pipe 5 is embedded and installed inside the discharging slope to avoid the situation where the recovery pipe 5 blocks the material from flowing out. The clamp 1 is directly sleeved on the outer wall of the recovery pipe 5 during production.

[0026] The clamp 1 is a fan-shaped ring structure, specifically as Figure 1 and 3 shown. The opening direction of the clamp 1 faces the kiln tail of the rotary kiln. The kiln tail is on the left side of the clamp 1 in Figure 3 . When the material is calcined in the rotary kiln, it flows from the kiln tail to the kiln head, then enters the discharging device from the kiln head, and finally discharges. The opening of the clamp 1 faces the kiln tail, so that when the hot gas flows with the material in the discharging device, it can directly contact the front of the recovery pipe 5 ( Figure 3 the outer wall part of the recovery pipe 5 corresponding to the opening of the clamp 1 in the figure), reducing the blockage, thereby further improving the thermal efficiency.

[0027] The radial dimension of the inner circle of the clamp 1 corresponds to the outer diameter dimension of the recovery pipe 5, so that the inner circle of the clamp 1 can be stably sleeved on the outer wall of the recovery pipe 5.

[0028] The central angle of the clamp 1 is greater than 180 degrees, so that the central angle of the opening of the clamp 1 is less than 180 degrees, thereby preventing the recovery pipe 5 from falling out of the clamp 1.

[0029] A vertical connecting rod 3 is welded to the top of the clamp 1. The vertical connecting rod 3 is connected between the clamp 1 and the inner wall of the discharging device, so that an interval is maintained between the recovery pipe 5 and the inner wall of the discharging device, facilitating the hot gas to flow through the interval and further increasing the contact area between the recovery pipe 5 and the hot gas.

[0030] The cross-section of the clamp 1 is wide in the middle and narrow at both ends. The end of the clamp 1 close to the recovery pipe 5 is in a V shape, specifically as Figure 4, the contact surface between the clamp 1 and the recovery pipe 5 is close to a line, thereby reducing the contact area between the clamp 1 and the recovery pipe 5 and further increasing the contact area between the recovery pipe 5 and the hot gas.

[0031] At the same time, the axial thickness of the clamp 1 is less than the radial width, making the overall clamp 1 a flat fan-shaped mechanism, thereby reducing the blocking effect on the backward flow of the hot gas.

[0032] There are multiple clamps 1, and the multiple clamps 1 are evenly spaced along the axial direction of the recovery pipe 5. As Figures 1-2 shown, at the same time, the multiple clamps 1 are distributed in an arc, and the radian size of the arc distribution is the same as that of the recovery pipe 5, increasing the stability of the support of this structure and the recovery pipe 5.

[0033] A transverse connecting rod 2 is welded to the top of the clamp 1, and the top of the transverse connecting rod 2 is connected to the bottom of the vertical connecting rod 3, increasing the connection stability between the multiple clamps 1.

[0034] A longitudinal connecting rod 4 is welded to the top of the vertical connecting rod 3. The longitudinal connecting rod 4 is arranged along the axial direction of the rotary kiln body. The inner wall of the discharging device is lined with refractory bricks or refractory concrete. When installing the recovery pipe 5 during the construction of the rotary kiln, the longitudinal connecting rod 4 is directly embedded in the gaps between the refractory bricks or in the refractory concrete, and this structure is fixed to the inner wall of the discharging device through the longitudinal connecting rod 4.

[0035] The longitudinal connecting rod 4 is arranged along the axial direction of the rotary kiln body, which is convenient for matching with the multi-row structure of the recovery pipe 5. Specifically, as Figures 5-6 shown, when using this structure to fixedly install the recovery pipe 5, the structures on different recovery pipes 5 at the same position are on the same straight line, and the longitudinal connecting rod 4 is also on the same straight line. The multiple longitudinal connecting rods 4 can be directly welded together. In this way, multiple such structures are regarded as a whole, and are embedded and fixed in the inner wall of the discharging device through the welded longitudinal connecting rods 4, improving the connection stability between this structure and the discharging device when installing multiple rows of recovery pipes 5.

[0036] The central angle of the clamp 1 is between 200 degrees and 270 degrees, so that the opening of the clamp 1 is between 90 degrees and 180 degrees, which can not only reduce the blockage between the hot gas and the recovery pipe 5, but also enable the clamp 1 to stably hold the recovery pipe 5.

[0037] Working principle: When laying the inner wall of the discharging device during the construction of the rotary kiln, the longitudinal connecting rod 4 is embedded and fixed in the inner wall of the discharging device, so that there is a gap between the recovery pipe 5 and the inner wall of the discharging device, increasing the contact area between the hot gas and the recovery pipe 5;

[0038] When the hot air and the material flow in the discharging device, the flat clamp 1 can effectively reduce the blocking effect on the hot air, facilitating the backward flow of the hot air and enabling more heat exchange with the subsequent recovery pipes 5.

[0039] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

[0040] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations 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, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. An installation structure for a rotary kiln head waste heat recovery pipe, characterized in that: The invention comprises a clamp (1) sleeved on the outer wall of a recovery pipe (5), the clamp (1) being a fan-shaped ring structure, the opening direction of the clamp (1) facing the kiln tail of the rotary kiln, the radial dimension of the inner circle of the clamp (1) corresponding to the outer diameter of the recovery pipe (5), the central angle of the clamp (1) being greater than 180 degrees, and a vertical connecting rod (3) being arranged on the top of the clamp (1).

2. The installation structure of the rotary kiln head waste heat recovery pipe according to claim 1 is characterized in that: The cross-section of the clamp (1) is wide in the middle and narrow at both ends, and the end of the clamp (1) close to the recovery pipe (5) is V-shaped.

3. The installation structure of the rotary kiln head waste heat recovery pipe according to claim 2 is characterized in that: There are a plurality of clamps (1), and the plurality of clamps (1) are evenly spaced and distributed along the axial direction of the recovery pipe (5).

4. The installation structure of the rotary kiln head waste heat recovery pipe according to claim 3 is characterized in that: A transverse connecting rod (2) is arranged on the top of the clamp (1), and the top of the transverse connecting rod (2) is connected to the bottom of the vertical connecting rod (3).

5. The installation structure of the rotary kiln head waste heat recovery pipe according to claim 4 is characterized in that: A longitudinal connecting rod (4) is arranged at the top of the vertical connecting rod (3), and the longitudinal connecting rod (4) is arranged along the axial direction of the rotary kiln body.

6. The installation structure of the rotary kiln head waste heat recovery pipe according to claim 5 is characterized in that: The central angle of the clamp (1) is between 200 degrees and 270 degrees.

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