Oxygen-enriched combustion device for cement kiln

Abstract

The utility model relates to a cement kiln oxygen-enriched combustion device which comprises a kiln body and an oxygen inlet device, an exhaust pipe is arranged above the side wall of the kiln body, the oxygen inlet device comprises a central oxygen inlet pipe, a communicating pipe and a plurality of eccentric oxygen inlet pipes, the central oxygen inlet pipe and the kiln body are coaxially arranged, the eccentric oxygen inlet pipes are circumferentially arranged on the outer side of the central oxygen inlet pipe, and the top end of the central oxygen inlet pipe penetrates through the kiln body. The bottom end of the central oxygen inlet pipe extends to the kiln body, the communicating pipes are circumferentially arranged at the bottom end of the central oxygen inlet pipe, one end of each communicating pipe is communicated with the central oxygen inlet pipe, the other end of each communicating pipe is communicated with the eccentric oxygen inlet pipe, a plurality of first oxygen outlet holes are formed in the side wall of the central oxygen inlet pipe, and a plurality of second oxygen outlet holes are formed in the side wall of the eccentric oxygen inlet pipe. Specifically, during production, oxygen is input into the kiln body through the central oxygen inlet pipe, after the oxygen enters the central oxygen inlet pipe, one part of the oxygen is directly and uniformly discharged from the first oxygen outlet holes in the side wall of the central oxygen inlet pipe, and the other part of the oxygen enters the eccentric oxygen inlet pipe from the communicating pipe and is uniformly discharged from the second oxygen outlet holes; therefore, oxygen is quickly and uniformly distributed on the whole kiln body so as to fully calcine cement materials, and energy waste caused by insufficient combustion is avoided.

Description

Technical Field

[0001] The utility model relates to the field of cement kilns, in particular to an oxygen-enriched combustion device for a cement kiln. Background Art

[0002] A cement kiln is a device for calcining cement raw materials into clinker. In the conventional calcination of cement by existing cement kilns, only 21% of the oxygen in the air participates in the combustion process, while about 79% of the nitrogen absorbs a large amount of heat released by the combustion reaction and is discharged as flue gas, which not only reduces the flame temperature but also causes energy waste and urgently needs improvement. Content of the Utility Model

[0003] The purpose of the utility model is to provide an oxygen-enriched combustion device for a cement kiln, which is used to solve the problem of energy waste caused by insufficient combustion of existing cement kilns.

[0004] To solve the above problems, the utility model provides an oxygen-enriched combustion device for a cement kiln, which includes a kiln body and an oxygen inlet device. The oxygen inlet device is rotatably arranged in the kiln body. An exhaust pipe is arranged above the side wall of the kiln body. The oxygen inlet device includes a central oxygen inlet pipe coaxially arranged with the kiln body, a connecting pipe, and a plurality of eccentric oxygen inlet pipes circumferentially arranged outside the central oxygen inlet pipe. The top end of the central oxygen inlet pipe penetrates through the kiln body, and the bottom end of the central oxygen inlet pipe extends into the kiln body. A plurality of the connecting pipes are circumferentially arranged at the bottom end of the central oxygen inlet pipe. One end of the connecting pipe is communicated with the central oxygen inlet pipe, and the other end of the connecting pipe is communicated with the eccentric oxygen inlet pipe. A plurality of first oxygen outlet holes are formed in the side wall of the central oxygen inlet pipe, and a plurality of second oxygen outlet holes are formed in the side wall of the eccentric oxygen inlet pipe.

[0005] The oxygen-enriched combustion device for a cement kiln provided by the utility model further has the following technical features:

[0006] Further, the diameter of the central oxygen inlet pipe is larger than that of the eccentric oxygen inlet pipe.

[0007] Further, the aperture of the first oxygen outlet hole is 3-5 mm, and the aperture of the second oxygen outlet hole is 1-2 mm.

[0008] Further, the included angle between the central axes of two adjacent eccentric oxygen inlet pipes is 60°.

[0009] Further, an activated carbon filter screen is fixedly arranged in the exhaust pipe.

[0010] Further, the materials of the central oxygen inlet pipe and the eccentric oxygen inlet pipe are both alumina ceramics.

[0011] The utility model has the following beneficial effects: During production, oxygen is input into the kiln body through the central oxygen inlet pipe. After entering the central oxygen inlet pipe, a part of the oxygen is directly and evenly discharged from the first oxygen outlet holes on the side wall of the central oxygen inlet pipe, and another part of the oxygen enters the eccentric oxygen inlet pipe through the connecting pipe and is evenly discharged from the second oxygen outlet holes, thereby quickly and evenly filling the entire kiln body with oxygen to fully calcine the cement material and avoid energy waste caused by insufficient combustion. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of the overall structure of the oxygen-enriched combustion device for the cement kiln;

[0013] Figure 2 It is a schematic diagram of the half-sectional structure of the oxygen-enriched combustion device for the cement kiln. Detailed Embodiment

[0014] The present utility model will be described in detail below with reference to the drawings and in conjunction with the embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0015] As Figures 1 to 2 In an embodiment of an oxygen-enriched combustion device for a cement kiln of the present utility model as shown, it includes a kiln body 10 and an oxygen inlet device 20. The oxygen inlet device 20 is rotatably arranged inside the kiln body 10. Specifically, the cement material can also be stirred through the oxygen inlet device 20 to improve the uniformity of heat reception of the cement material. An exhaust pipe 100 is provided above the side wall of the kiln body 10. The oxygen inlet device 20 includes a central oxygen inlet pipe 21 coaxially arranged with the kiln body 10, a connecting pipe 22, and a plurality of eccentric oxygen inlet pipes 23 circumferentially arranged outside the central oxygen inlet pipe 21. The top end of the central oxygen inlet pipe 21 penetrates the kiln body 10, and the bottom end of the central oxygen inlet pipe 21 extends into the kiln body 10. A plurality of connecting pipes 22 are circumferentially arranged at the bottom end of the central oxygen inlet pipe 21. One end of the connecting pipe 22 is communicated with the central oxygen inlet pipe 21, and the other end of the connecting pipe 22 is communicated with the eccentric oxygen inlet pipe 23. A plurality of first oxygen outlet holes 210 are opened on the side wall of the central oxygen inlet pipe 21, and a plurality of second oxygen outlet holes 230 are opened on the side wall of the eccentric oxygen inlet pipe 23. Specifically, during production, oxygen is input into the kiln body through the central oxygen inlet pipe. After entering the central oxygen inlet pipe, a part of the oxygen is directly and evenly discharged from the first oxygen outlet holes 210 on the side wall of the central oxygen inlet pipe 21, and another part of the oxygen enters the eccentric oxygen inlet pipe 23 through the connecting pipe 22 and is evenly discharged from the second oxygen outlet holes 230, thereby quickly and evenly filling the entire kiln body 10 with oxygen to fully calcine the cement material and avoid insufficient combustion.

[0016] In an embodiment of the present application, the diameter of the central oxygen inlet pipe 21 is larger than that of the eccentric oxygen inlet pipe 23. Specifically, since the temperature at the center of the kiln body 10 is relatively high, such a design can increase the oxygen ventilation volume at the center of the kiln body 10 and improve the calcination degree of cement.

[0017] In an embodiment of the present application, the aperture of the first oxygen outlet hole 210 is 3-5 mm, and the aperture of the second oxygen outlet hole 230 is 1-2 mm. Specifically, since the eccentric oxygen inlet pipe 23 is far from the central oxygen inlet pipe 21, reducing the aperture of the second oxygen outlet hole 230 can make the oxygen discharged from the second oxygen outlet hole 230 have a certain outlet pressure, improve the oxygen discharge efficiency, and further improve the full calcination degree of the cement material.

[0018] In an embodiment of the present application, the included angle between the central axes of two adjacent eccentric oxygen inlet pipes 23 is 60°.

[0019] In an embodiment of the present application, an activated carbon filter net 101 is fixedly arranged in the exhaust pipe 100. Specifically, the harmful gases discharged can be purified through the activated carbon filter net 101 to avoid polluting the atmosphere.

[0020] In an embodiment of the present application, the materials of the central oxygen inlet pipe 21 and the eccentric oxygen inlet pipe 23 are both alumina ceramics.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cement kiln oxygen-enriched combustion device, characterized in that: It comprises a kiln body and an oxygen supply device, wherein the oxygen supply device can be rotatably arranged in the kiln body, an exhaust pipe is arranged above the side wall of the kiln body, the oxygen supply device comprises a central oxygen supply pipe coaxially arranged with the kiln body, a connecting pipe and a plurality of eccentric oxygen supply pipes circumferentially arranged on the outside of the central oxygen supply pipe, the top end of the central oxygen supply pipe passes through the kiln body, the bottom end of the central oxygen supply pipe extends to the kiln body, a plurality of connecting pipes are circumferentially arranged at the bottom end of the central oxygen supply pipe, one end of the connecting pipe is connected with the central oxygen supply pipe, and the other end of the connecting pipe is connected with the eccentric oxygen supply pipe, a plurality of first oxygen outlet holes are opened on the side wall of the central oxygen supply pipe, and a plurality of second oxygen outlet holes are opened on the side wall of the eccentric oxygen supply pipe.

2. The cement kiln oxygen-enriched combustion device according to claim 1, characterized in that: The diameter of the central oxygen inlet pipe is larger than the diameter of the eccentric oxygen inlet pipe.

3. The cement kiln oxygen-enriched combustion device according to claim 1, characterized in that: The aperture of the first oxygen outlet hole is 3-5 mm, and the aperture of the second oxygen outlet hole is 1-2 mm.

4. The cement kiln oxygen-enriched combustion device according to claim 1, characterized in that: The angle between the central axes of two adjacent eccentric oxygen inlet pipes is 60°.

5. The cement kiln oxygen-enriched combustion device according to claim 1, characterized in that: An activated carbon filter is fixedly arranged in the exhaust pipe.

6. The cement kiln oxygen-enriched combustion device according to claim 1, characterized in that: The central oxygen inlet pipe and the eccentric oxygen inlet pipe are both made of alumina ceramics.

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