CN213421676U

CN213421676U - Enhanced heat transfer structure of rotary kiln

Info

Publication number: CN213421676U
Application number: CN202022467323.5U
Authority: CN
Inventors: 李平; 黄建林
Original assignee: Guangxi Hengte New Material Technology Co ltd
Current assignee: Guangxi Hengte New Material Technology Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-06-11
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses a rotary kiln's intensive heat transfer structure, include: the rotary kiln body is obliquely arranged, and the kiln tail of the rotary kiln body is arranged higher than the kiln head; the rotary kiln is characterized in that the rotary kiln body is of a double-layer cylinder structure and comprises an outer cylinder body and an inner cylinder body which are coaxially and fixedly arranged, the inner cylinder body forms a counter-flow flue gas pipeline for contacting heat source high-temperature gas and materials, the cross section of the inner cylinder body is in an annular wave shape, a plurality of convex arc surfaces and a plurality of concave arc surfaces are arranged on the inner cylinder body, a downstream combustion-supporting air channel is formed between the outer cylinder body and the inner cylinder body, and a combustion-supporting air outlet is formed in the position, close to the kiln head, of the inner cylinder. The double-layer barrel structure enhances the heat preservation effect of the rotary kiln body, combustion air is preheated through the downstream combustion air channel, fuel consumption is effectively reduced, combustion is more sufficient, the annular wavy inner barrel plays a role in raising materials, the heat exchange area of the materials and hot air flow is increased, and the heat exchange efficiency is effectively improved.

Description

Enhanced heat transfer structure of rotary kiln

Technical Field

The utility model relates to a rotary kiln field especially relates to a rotary kiln's intensive heat transfer structure.

Background

In many production industries, such as building materials, metallurgy, chemical engineering, environmental protection, etc., rotary drum equipment is widely used to mechanically, physically or chemically treat solid materials, and such equipment is called a rotary kiln. The invention of the rotary kiln enables the cement industry to develop rapidly, simultaneously promotes the research of people on the application of the rotary kiln, quickly enables the rotary kiln to be widely applied to a plurality of industrial fields, is more and more important in the production and becomes the core equipment for the production of corresponding enterprises.

In the production process of the ceramic pigment, a rotary kiln is mostly adopted for drying materials. Among the prior art rotary kiln drives the material through the rotation and at the uniform velocity glides, and the high temperature flue gas contacts the heating with the material countercurrent flow in the rotary kiln, and the material is insufficient with the contact of high temperature air current at the in-process that glides and leads to the heat exchange efficiency low, and current rotary kiln's thermal-insulated effect is relatively poor, makes calorific loss big, has wasted the fuel, has increased the expenditure for the enterprise.

Disclosure of Invention

To the problem that exists among the prior art, the utility model aims to provide a heat transfer structure is reinforceed to rotary kiln of heat exchange efficiency height and reinforcing heat preservation effect.

In order to achieve the above purpose, the utility model adopts the following technical scheme.

An enhanced heat transfer structure of a rotary kiln, comprising: the rotary kiln body is obliquely arranged, and the kiln tail of the rotary kiln body is arranged higher than the kiln head; the rotary kiln is characterized in that the rotary kiln body is of a double-layer cylinder structure and comprises an outer cylinder body and an inner cylinder body which are coaxially and fixedly arranged, the inner cylinder body forms a counter-flow flue gas pipeline for contacting heat source high-temperature gas and materials, the cross section of the inner cylinder body is in an annular wave shape, a plurality of convex arc surfaces and a plurality of concave arc surfaces are arranged on the inner cylinder body, a downstream combustion-supporting air channel is formed between the outer cylinder body and the inner cylinder body, and a combustion-supporting air outlet is formed in the position, close to the kiln head, of the inner cylinder.

As a further explanation of the above scheme, the convex arc surfaces and the concave arc surfaces are alternately distributed on the inner cylinder.

As a further explanation of the above-described aspect, a heat storage body is filled between the inner cylinder and the outer cylinder.

As a further explanation of the above scheme, the inner wall of the outer cylinder body is coated with a high temperature resistant heat insulation coating.

As a further explanation of the above scheme, a material raising plate is arranged on the inner wall of the inner cylinder.

As a further explanation of the above scheme, the lifting blade close to the kiln head is of a hollow structure and is composed of a lifting blade shell and a hollow cavity arranged inside the lifting blade, the hollow cavity is communicated with the downstream combustion air channel, and the combustion air outlet is arranged on the lifting blade shell.

As a further explanation of the above scheme, the material lifting plate is provided with a hook-shaped structure bent to one side, and the bending direction of the hook-shaped structure is consistent with the rotation direction of the rotary kiln body.

The utility model has the advantages that:

firstly, the double-layer cylinder structure enhances the heat preservation effect of the rotary kiln body, the combustion air is preheated through the downstream combustion air channel, the temperature of the combustion air is improved, the consumption of fuel is effectively reduced, and the combustion is more sufficient.

The convex cambered surface plays a role in material lifting, the materials can be lifted repeatedly through the convex cambered surface when the rotary cylinder rotates, the materials fall to the concave cambered surface along the convex cambered surface, and can be in direct contact with hot air flow more directly in the falling process, so that the contact time with heat is prolonged, the heat utilization rate is improved, and the materials are uniformly roasted; the annular wavy inner cylinder increases the heat exchange area of the material, the combustion air and the hot air flow, and effectively improves the heat exchange efficiency.

Thirdly, set up the lifting blade and further improve heat exchange efficiency, combustion air exports the setting on the lifting blade that is close to the kiln head, can form the gas curtain in the periphery of lifting blade for the lifting blade is not direct contact with the material, increases the life of lifting blade.

Drawings

Fig. 1 is a cross-sectional view of the enhanced heat transfer structure of the rotary kiln according to the present invention.

Fig. 2 is a top view of the enhanced heat transfer structure of the rotary kiln according to the present invention.

Fig. 3 is a structural diagram of a material lifting plate of the enhanced heat transfer structure of the rotary kiln of the present invention.

Description of reference numerals:

1: outer cylinder, 2: inner cylinder, 3: lifting blade, 4: forward flow combustion air passage, 5: and a combustion air outlet.

2-1: convex cambered surface, 2-2: concave arc surface, 3-1: a hook-type structure.

Detailed Description

In the description of the present invention, it should be noted that, for the orientation words, if there are terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the orientation and positional relationship indicated are based on the orientation or positional relationship shown in the drawings, and only for the convenience of describing the present invention and simplifying the description, it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and not be construed as limiting the specific scope of the present invention.

Furthermore, if the terms "first" and "second" are used for descriptive purposes only, they are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features. Thus, the definition of "a first" or "a second" feature may explicitly or implicitly include one or more of the features, and in the description of the invention, "at least" means one or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "assembled", "connected", and "connected", if any, are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; or may be a mechanical connection; the two elements can be directly connected or connected through an intermediate medium, and the two elements can be communicated with each other. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.

In the present application, unless otherwise specified or limited, "above" or "below" a first feature may include the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. Also, the first feature being "above," "below," and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply an elevation which indicates a level of the first feature being higher than an elevation of the second feature. The first feature being "above", "below" and "beneath" the second feature includes the first feature being directly below or obliquely below the second feature, or merely means that the first feature is at a lower level than the second feature.

The following description will be further made in conjunction with the accompanying drawings of the specification, so that the technical solution and the advantages of the present invention are clearer and clearer. The embodiments described below are exemplary and are intended to be illustrative of the present invention, but should not be construed as limiting the invention.

As shown in fig. 1 to 3, a structure for improving heat exchange efficiency of a rotary kiln includes: the rotary kiln comprises a rotary kiln body which is obliquely arranged, wherein a kiln tail of the rotary kiln body is arranged higher than a kiln head, a burner is arranged in the kiln head, and a feeding device and a flue gas outlet are arranged at the kiln tail; the rotary kiln is characterized in that the rotary kiln body is of a double-layer cylinder structure and comprises an outer cylinder body 1 and an inner cylinder body 2 which are coaxially and fixedly arranged, the inner cylinder body 2 forms a counter-flow flue gas pipeline for contacting heat source high-temperature gas and materials, the cross section of the inner cylinder body 2 is in an annular wave shape, a plurality of convex arc surfaces 2-1 and a plurality of concave arc surfaces 2-2 are arranged on the inner cylinder body, a downstream combustion-supporting air channel 4 is formed between the outer cylinder body 1 and the inner cylinder body 2, and a combustion-supporting air outlet is formed in the position, close to the kiln head, of the inner cylinder body. The double-layer cylinder structure enhances the heat insulation effect of the rotary kiln body, the combustion air is preheated through the downstream combustion air channel, the temperature of the combustion air is increased, the consumption of fuel is effectively reduced, and the combustion is more sufficient. The outer side of the downstream combustion-supporting air channel is communicated with an air blower through a connecting pipe, so that the downstream combustion-supporting air channel is in positive pressure, air can be injected into the inner cylinder, and materials can be prevented from entering the downstream combustion-supporting air channel from a combustion-supporting air outlet.

The convex cambered surfaces 2-1 and the concave cambered surfaces 2-2 are alternately distributed on the inner cylinder body 2. The 2-1 shape of the convex cambered surface plays a role in lifting materials, the materials can be repeatedly lifted through the convex cambered surface when the rotary cylinder rotates, the materials fall to the concave cambered surface along the convex cambered surface, and can be directly contacted with hot air flow in the falling process, so that the contact time with heat is prolonged, the heat utilization rate is improved, and the materials are uniformly roasted; the annular wavy inner cylinder increases the heat exchange area between the material and the hot air flow, and effectively improves the heat exchange efficiency.

And a heat accumulator is filled between the inner cylinder 2 and the outer cylinder 1. The internal temperature of the rotary kiln body is effectively controlled in the kiln body, so that the combustion air is effectively preheated.

The inner wall of the outer cylinder body 1 is coated with a high-temperature-resistant heat-insulating coating, so that the heat-insulating effect of the rotary kiln body is further enhanced.

And a material lifting plate 3 is arranged on the inner wall of the inner cylinder body 2.

The lifting plate 3 located at the kiln head and close to the kiln head is of a hollow structure and consists of a lifting plate shell and a hollow cavity arranged inside the lifting plate, the hollow cavity is communicated with the downstream combustion air channel, and a combustion air outlet 5 is arranged on the lifting plate shell 3. The combustion air outlet is arranged on the lifting blade, and an air curtain can be formed at the periphery of the lifting blade, so that the lifting blade is not in direct contact with materials, and the service life of the lifting blade is prolonged. In other embodiments, the combustion air outlet is directly disposed on the inner cylinder, which is not limited to this embodiment. The shape of the combustion air outlet is not limited, and can be circular, oval or rectangular.

The lifting blade 3 is provided with a hook-shaped structure 3-1 bent towards one side, and the bending direction of the hook-shaped structure 3-1 is consistent with the rotating direction of the rotary kiln body. The material raising plate is made of high-temperature resistant metal materials. The hook-shaped structure enables the material to turn over in the inner cylinder body, further enables the material and hot air flow to exchange heat fully and be heated uniformly.

It will be understood by those skilled in the art from the foregoing description of the structure and principles that the present invention is not limited to the specific embodiments described above, and that modifications and substitutions based on the known art are intended to fall within the scope of the invention, which is defined by the claims and their equivalents. The details not described in the detailed description are prior art or common general knowledge.

Claims

1. An enhanced heat transfer structure of a rotary kiln, comprising: the rotary kiln body is obliquely arranged, and the kiln tail of the rotary kiln body is arranged higher than the kiln head; the rotary kiln is characterized in that the rotary kiln body is of a double-layer cylinder structure and comprises an outer cylinder body and an inner cylinder body which are coaxially and fixedly arranged, the inner cylinder body forms a counter-flow flue gas pipeline for contacting heat source high-temperature gas and materials, the cross section of the inner cylinder body is in an annular wave shape, a plurality of convex arc surfaces and a plurality of concave arc surfaces are arranged on the inner cylinder body, a downstream combustion-supporting air channel is formed between the outer cylinder body and the inner cylinder body, and a combustion-supporting air outlet is formed in the position, close to the kiln head, of the inner cylinder.

2. The enhanced heat transfer structure of the rotary kiln as claimed in claim 1, wherein the convex cambered surfaces and the concave cambered surfaces are alternately distributed on the inner cylinder body.

3. The structure of claim 1, wherein a heat storage body is filled between the inner cylinder and the outer cylinder.

4. The enhanced heat transfer structure of the rotary kiln as claimed in claim 1, wherein the inner wall of the outer cylinder is coated with a high temperature resistant heat insulating coating.

5. The structure of claim 1, wherein a material raising plate is provided on an inner wall of the inner cylinder.

6. The enhanced heat transfer structure of the rotary kiln as recited in claim 5, wherein the material lifting plate near the kiln head is a hollow structure and is composed of a material lifting plate shell and a hollow cavity arranged inside the material lifting plate, the hollow cavity is communicated with the downstream combustion air channel, and the combustion air outlet is arranged on the material lifting plate shell.

7. The structure of claim 5, wherein the lifter plate is bent to a hook-shaped structure toward one side, and the bending direction of the hook-shaped structure is consistent with the rotation direction of the rotary kiln body.