Combustion-supporting air inlet structure of rotary kiln

Abstract

The utility model relates to the technical field of rotary kiln combustion-supporting, in particular to a rotary kiln combustion-supporting air inlet structure, which comprises a heat exchange bin, a plurality of heat conducting pipes are fixedly installed inside the heat exchange bin, a gas distribution assembly is arranged at the lower end of the heat exchange bin, and a stirring assembly is arranged inside the heat exchange bin, wherein the stirring assembly comprises a supporting ring fixedly installed at the upper end inside the heat exchange bin, and stirring blades are fixedly installed on the outer surface of the rotating frame. In the utility model, the secondary air flows through the plurality of heat conducting pipes, so that the pulverized coal exchanges heat when flowing through the heat exchange bin, part of the heat in the secondary air preliminarily heats the pulverized coal, the heat of the secondary air is fully utilized, the heated pulverized coal is then mixed into the tertiary air, the tertiary air heats the pulverized coal, the temperature of the pulverized coal before combustion is further improved, the pulverized coal is more convenient to burn, the time required for heating the pulverized coal inside the combustion chamber is reduced, the influence of the time on combustion is reduced, and the combustion effect of the material is improved.

Description

Technical Field

[0001] This utility model relates to the field of rotary kiln combustion technology, specifically a rotary kiln combustion air intake structure. Background Technology

[0002] The working principle of a rotary kiln is to cause the material to undergo complex physical and chemical changes inside the kiln through an inclined and slowly rotating cylinder, ultimately producing clinker. The air intake system of a rotary kiln mainly includes a primary air system, a secondary air system, and a tertiary air system. The tertiary air and the secondary air have the same source, both coming from the hot air after the clinker has been cooled by the clinker cooler, but their destinations are different. The secondary air is used for combustion, while the tertiary air contains about 10% fine coal powder.

[0003] The existing rotary kiln's secondary air provides oxygen for combustion and heats the oxygen. However, air has poor thermal conductivity, so the heat in the secondary air is not easily fully utilized. Pulverized coal needs to be heated to a certain temperature for combustion. When the tertiary air transports pulverized coal, it can only easily transfer the heat from the tertiary air to the pulverized coal. The pulverized coal still needs to be heated for a period of time before combustion, which will also lead to a decrease in combustion temperature and a decrease in the combustion efficiency of the material. Utility Model Content

[0004] The purpose of this invention is to provide a rotary kiln combustion air intake structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A rotary kiln combustion air intake structure includes:

[0007] The heat exchange chamber contains multiple heat-conducting pipes that are fixedly installed inside.

[0008] The gas distribution component is located at the lower end of the heat exchange chamber;

[0009] A stirring assembly is disposed inside a heat exchange chamber. The stirring assembly includes a support ring fixedly installed at the upper end of the heat exchange chamber. A rotating plate is movably disposed inside the support ring. A rotating frame is fixedly installed on the lower surface of the rotating plate. A stirring blade is fixedly installed on the outer surface of the rotating frame.

[0010] Furthermore, a feed pipe is fixedly embedded at the upper end of the outer surface of the heat exchange chamber, and gas-gathering hoods are fixedly installed at both ends of the plurality of heat-conducting pipes. An air inlet pipe is fixedly installed at one end of one gas-gathering hood, and an air outlet pipe is fixedly installed at the other end of the other gas-gathering hood.

[0011] Furthermore, a bearing is fixedly connected between the support ring and the rotating plate, and the rotating plate passes through the heat exchange chamber and is rotatably connected to the heat exchange chamber.

[0012] Furthermore, a gear ring is fixedly installed at the upper end of the outer surface of the rotating plate, a motor is fixedly installed on the upper surface of the heat exchange chamber, and a gear is fixedly installed at the output end of the motor, the gear meshing with the gear ring for transmission.

[0013] Furthermore, the gas distribution assembly includes:

[0014] Intake three-way pipe;

[0015] Solenoid valve No. 1 is fixedly installed at one end of the intake tee pipe;

[0016] The second solenoid valve is fixedly installed at the other end of the intake tee.

[0017] Preferably, a No. 2 three-way pipe is fixedly installed at one end of the No. 2 solenoid valve, and a spiral blade is fixedly installed inside the No. 2 three-way pipe.

[0018] Preferably, a No. 3 solenoid valve is fixedly installed at one end of the No. 2 three-way pipe, and a discharge pipe is fixedly installed at the lower end of the outer surface of the heat exchange chamber, with one end of the discharge pipe being fixedly connected to the No. 3 solenoid valve.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. The motor drives the rotating frame and stirring blades to rotate, which in turn stirs the coal powder inside the heat exchange chamber. This allows the heat from the secondary air to be evenly transferred to the coal powder. The bearings reduce the friction between the rotating plate and the support ring. The secondary air flows through multiple heat pipes, allowing the coal powder to exchange heat as it flows through the heat exchange chamber. This process allows some of the heat from the secondary air to preheat the coal powder, ensuring that the heat from the secondary air is fully utilized.

[0021] 2. When the No. 3 solenoid valve opens, pulverized coal enters the air inlet three-way pipe, mixing the heated pulverized coal with the tertiary air. The tertiary air heats the pulverized coal. As the tertiary air flows past the spiral blades, it rotates and flows within the No. 2 three-way pipe along the guide angle of the spiral blades. The pulverized coal is agitated in the tertiary air, increasing the heat transfer rate of the pulverized coal and further raising the temperature of the pulverized coal before combustion. This makes the pulverized coal easier to burn, reduces the time required for combustion inside the combustion chamber, minimizes the impact of this time on combustion, and improves the combustion efficiency of the material. The flow rate of the hot air entering from the air inlet three-way pipe is controlled by the opening angles of the No. 1 and No. 2 solenoid valves, thus facilitating the control of the flow rates of the secondary and tertiary air. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the disassembled structure of the stirring component in this utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the heat exchange chamber in this utility model;

[0025] Figure 4 This is a schematic diagram of the vertical cross-sectional structure of the heat exchange chamber and heat exchange tubes in this utility model;

[0026] Figure 5 This is a schematic diagram of the vertical cross-sectional structure of the heat exchange tube and the gas-gathering shroud in this utility model;

[0027] Figure 6 This is a schematic diagram of the vertical cross-sectional structure of the No. 2 tee pipe in this utility model.

[0028] In the diagram: 1. Heat exchange chamber; 101. Feed pipe; 102. Discharge pipe; 103. Heat conduction pipe; 104. Gas gathering hood; 105. Air inlet pipe; 106. Air outlet pipe; 2. Gas distribution assembly; 201. Air inlet tee pipe; 202. Solenoid valve No. 1; 203. Solenoid valve No. 2; 204. Tee pipe No. 2; 205. Solenoid valve No. 3; 206. Spiral blade; 3. Stirring assembly; 301. Support ring; 302. Bearing; 303. Rotating plate; 304. Rotating frame; 305. Stirring blade; 306. Motor; 307. Gear; 308. Gear ring. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-6 In this embodiment of the present invention, a rotary kiln combustion air intake structure includes a heat exchange chamber 1. Multiple heat-conducting pipes 103 are fixedly installed inside the heat exchange chamber 1. The heat-conducting pipes 103 conduct heat from the secondary air to the pulverized coal inside the heat exchange chamber 1. A feed pipe 101 is fixedly embedded in the upper part of the outer surface of the heat exchange chamber 1. Both ends of the multiple heat-conducting pipes 103 are fixedly installed with gas-gathering hoods 104. One gas-gathering hood 104 has an air inlet pipe 105 fixedly installed at one end, and another gas outlet pipe 106 is fixedly installed at the other end. A gas distribution component 2 is disposed at the lower end of the heat exchange chamber 1. A stirring component 3 is disposed inside the heat exchange chamber 1. The stirring component 3 includes a support ring 301 fixedly installed at the upper end of the heat exchange chamber 1. A rotating plate 303 is movably disposed inside the support ring 301. A rotating frame 304 is fixedly installed on the lower surface of the rotating plate 303. A stirring blade 305 is fixedly installed on the outer surface of the rotating frame 304.

[0031] Specifically, the secondary air enters through the inlet pipe 105, flows through the heat conduction pipe 103, and then exits through the outlet pipe 106. The stirring component 3 stirs the coal powder inside the heat exchange chamber 1, so that the heat of the secondary air is evenly transferred to the coal powder.

[0032] Example 1

[0033] like Figure 2-4 As shown, in this embodiment, a bearing 302 is fixedly connected between the support ring 301 and the rotating plate 303. The rotating plate 303 passes through the heat exchange chamber 1 and is rotatably connected to the heat exchange chamber 1. A gear ring 308 is fixedly installed at the upper end of the outer surface of the rotating plate 303. A motor 306 is fixedly installed on the upper surface of the heat exchange chamber 1. A gear 307 is fixedly installed at the output end of the motor 306. The gear 307 meshes with the gear ring 308 for transmission.

[0034] In this embodiment, the motor 306 operates, driving the gear 307 to rotate. Through the meshing transmission of the gear 307 and the gear ring 308, the gear ring 308 drives the rotating plate 303 to rotate, which in turn drives the rotating frame 304 and the stirring blade 305 to rotate. The stirring blade 305 stirs the coal powder inside the heat exchange chamber 1, so that the heat of the secondary air is evenly transferred to the coal powder. The bearing 302 reduces the friction between the rotating plate 303 and the support ring 301. Thus, the secondary air flows through multiple heat pipes 103, allowing the coal powder to exchange heat as it flows through the heat exchange chamber 1. This allows some of the heat in the secondary air to preliminarily heat the coal powder, making full use of the heat of the secondary air.

[0035] like Figure 1 and Figure 6 As shown, in this embodiment, the gas distribution assembly 2 includes an inlet three-way pipe 201, a first solenoid valve 202 fixedly installed at one end of the inlet three-way pipe 201, and a second solenoid valve 203 fixedly installed at the other end of the inlet three-way pipe 201; a third solenoid valve 205 is fixedly installed at one end of the second three-way pipe 204, and a discharge pipe 102 is fixedly installed at the lower end of the outer surface of the heat exchange chamber 1, with one end of the discharge pipe 102 fixedly connected to the third solenoid valve 205.

[0036] In practice, the heated pulverized coal is discharged from the discharge pipe 102, and the No. 3 solenoid valve 205 is opened, allowing the pulverized coal to enter the air inlet three-way pipe 201. The heated pulverized coal is mixed with the tertiary air, which heats the pulverized coal, further increasing its temperature before combustion, making it easier to burn, reducing the time required for combustion inside the combustion chamber, minimizing the impact of this time on combustion, and improving the combustion efficiency of the material. The flow rate of the hot air entering from the air inlet three-way pipe 201 is controlled by the opening angle of the No. 1 solenoid valve 202 and the No. 2 solenoid valve 203, thereby facilitating the control of the flow rates of the secondary and tertiary air.

[0037] Example 2

[0038] Based on Example 1, in order to compensate for the slow heat transfer rate between the tertiary air and pulverized coal.

[0039] like Figure 1 and Figure 6 As shown, in this embodiment, a second three-way pipe 204 is fixedly installed at one end of the second solenoid valve 203, and a spiral blade 206 is fixedly installed inside the second three-way pipe 204.

[0040] In practice, when the tertiary air enters the No. 2 three-way pipe 204, as it flows through the spiral blade 206, it rotates and flows inside the No. 2 three-way pipe 204 along the guide angle of the spiral blade 206. This causes the tertiary air to carry the pulverized coal out, agitating the pulverized coal and increasing the heat transfer speed of the tertiary air to the pulverized coal. This reduces the time required to heat the pulverized coal inside the combustion chamber and improves the combustion efficiency of the material.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A combustion air supply structure for a rotary kiln, characterized by, include: Heat exchange chamber (1), with multiple heat pipes (103) fixedly installed inside the heat exchange chamber (1); The gas distribution component (2) is located at the lower end of the heat exchange chamber (1); A stirring assembly (3) is disposed inside the heat exchange chamber (1). The stirring assembly (3) includes a support ring (301) fixedly installed at the upper end of the heat exchange chamber (1). A rotating plate (303) is movably disposed inside the support ring (301). A rotating frame (304) is fixedly installed on the lower surface of the rotating plate (303). A stirring blade (305) is fixedly installed on the outer surface of the rotating frame (304).

2. The kiln combustion air inlet structure according to claim 1, wherein The heat exchange chamber (1) has a feed pipe (101) fixedly embedded at the upper end of its outer surface. Both ends of the multiple heat conduction pipes (103) are fixedly installed with gas-gathering hoods (104). One end of one gas-gathering hood (104) is fixedly installed with an air inlet pipe (105), and the other end of the other gas-gathering hood (104) is fixedly installed with an air outlet pipe (106).

3. The kiln combustion air inlet structure according to claim 1, wherein A bearing (302) is fixedly connected between the support ring (301) and the rotating plate (303). The rotating plate (303) passes through the heat exchange chamber (1) and is rotatably connected to the heat exchange chamber (1).

4. The kiln combustion air inlet structure according to claim 1, wherein A gear ring (308) is fixedly installed at the upper end of the outer surface of the rotating plate (303), and a motor (306) is fixedly installed on the upper surface of the heat exchange chamber (1). A gear (307) is fixedly installed at the output end of the motor (306), and the gear (307) meshes with the gear ring (308) for transmission.

5. The kiln combustion air inlet structure according to claim 1 or 2, wherein The gas distribution component (2) includes: Intake tee (201); Solenoid valve No. 1 (202) is fixedly installed at one end of the intake tee pipe (201); The second solenoid valve (203) is fixedly installed at the other end of the intake tee pipe (201).

6. The kiln combustion air inlet structure according to claim 5, wherein The No. 2 solenoid valve (203) has a No. 2 three-way pipe (204) fixedly installed at one end, and a spiral blade (206) is fixedly installed inside the No. 2 three-way pipe (204).

7. The rotary kiln combustion air intake structure according to claim 6, characterized in that, A No. 3 solenoid valve (205) is fixedly installed at one end of the No. 2 three-way pipe (204), and a discharge pipe (102) is fixedly installed at the lower end of the outer surface of the heat exchange chamber (1). One end of the discharge pipe (102) is fixedly connected to the No. 3 solenoid valve (205).

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