Cement kiln alternative fuel feeding device

Abstract

The utility model relates to a cement kiln alternative fuel feeding device which comprises an air pipe, one end of the air pipe is rotatably connected with a conveying pipe, the tail end of the conveying pipe is provided with a mixed material outlet, the air pipe is fixedly connected with a feeder, and the other end of the air pipe is fixedly connected with a central fan. The inner wall of the air pipe and the inner wall of the conveying pipe are fixedly connected with spiral ribs arranged in a circumferential array mode respectively. According to the cement kiln alternative fuel feeding device, the spiral ribs in the conveying pipe are matched with the rotating conveying pipe, the air speed of pneumatic conveying is increased, deposition of large particles of alternative fuel is avoided, uniform feeding is guaranteed, and the combustion effect is improved.

Description

Technical Field

[0001] The utility model relates to a feeding device, in particular to a feeding device for alternative fuels in a cement kiln. Background Art

[0002] In the process of cement production, the use of alternative fuels has become an important means to reduce dependence on fossil fuels and lower carbon emissions. As a key link in the production of cement clinker, the combustion characteristics at the kiln head have a direct impact on the quality and production efficiency of cement clinker. Due to the instability of alternative fuels, they are less used as fuels at the kiln head, resulting in a low substitution rate of alternative fuels in the current cement kiln production. Through continuously improved pre-homogenization technology, the homogeneity of alternative fuels in the mixed fuel has been improved.

[0003] When using alternative fuels at the kiln head, it is necessary to transform the feeding device so that the alternative fuels can enter the kiln head continuously and stably. The existing feeding devices cannot adapt to the pneumatic conveying of larger particle alternative fuels, resulting in the re-separation of the pre-homogenized alternative fuels and affecting the combustion effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a feeding device for alternative fuels in a cement kiln, which is used to solve the problem that the existing feeding devices cannot adapt to the pneumatic conveying of larger particle alternative fuels, resulting in the re-separation of the pre-homogenized alternative fuels and affecting the combustion effect.

[0005] To solve the above problems, the utility model provides a feeding device for alternative fuels in a cement kiln, which includes an air duct. One end of the air duct is rotatably connected to a conveying pipe, and the tail end of the conveying pipe is provided with a mixing outlet. A feeder is fixedly connected to the air duct, and a central fan is fixedly connected to the other end of the air duct. Spiral ribs arranged in a circumferential array are fixedly connected to the inner walls of the air duct and the conveying pipe respectively.

[0006] The feeding device for alternative fuels in a cement kiln provided by the utility model also has the following technical features:

[0007] Further, a secondary air duct is sleeved at one end of the conveying pipe where the mixing outlet is located. The secondary air duct is rotatably connected to the conveying pipe, and an air supply pipe is connected to the secondary air duct. The other end of the air supply pipe is fixedly connected to a secondary fan.

[0008] Further, the front end of the secondary air duct is provided with a reduced-diameter tail nozzle, and the tail nozzle is longer than the mixing outlet and contracts towards the center of the tail nozzle.

[0009] Further, the feeder includes a spiral cylinder, a rotating spiral is arranged inside the spiral cylinder, a feeding motor is fixedly connected to one end of the spiral cylinder, the driving shaft of the feeding motor is fixedly connected to the central axis of the spiral, and a feeding pipe is fixedly connected to the spiral cylinder.

[0010] Furthermore, the other end of the spiral cylinder is obliquely connected to the air duct so that the feeding direction is consistent with the air supply direction.

[0011] Furthermore, a rotating motor is fixedly connected to the air duct, a driven gear is fixedly connected to the conveying pipe, a driving gear is fixedly connected to the driving shaft of the rotating motor, and the driving gear meshes with the driven gear.

[0012] The utility model has the following beneficial effects: The cement kiln alternative fuel feeding device described in this application utilizes the spiral ribs in the conveying pipe and the rotating conveying pipe to cooperate with each other, increases the air speed of pneumatic conveying, avoids the deposition of large particles of alternative fuel, ensures uniform feeding, and improves the combustion effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an isometric schematic view of the cement kiln alternative fuel feeding device according to an embodiment of the utility model;

[0014] Figure 2 is a front view sectional schematic view of the cement kiln alternative fuel feeding device according to an embodiment of the utility model;

[0015] Figure 3 is the cement kiln alternative fuel feeding device according to an embodiment of the utility model Figure 2 enlarged view of node A;

[0016] Figure 4 is a right view sectional schematic view of the cement kiln alternative fuel feeding device according to an embodiment of the utility model.

[0017] (1 - air duct, 2 - conveying pipe, 3 - mixing outlet, 4 - feeder, 5 - central fan, 6 - spiral rib, 7 - secondary air duct, 8 - air supply pipe, 9 - secondary fan, 10 - tail nozzle, 11 - rotating motor, 12 - driven gear, 13 - driving gear, 41 - spiral cylinder, 42 - spiral device, 43 - feeding motor, 44 - feeding pipe) DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0019] As Figures 1 to 4 shown in the embodiment of the cement kiln alternative fuel feeding device of the present utility model, the cement kiln alternative fuel feeding device includes an air duct 1, one end of the air duct 1 is rotatably connected to a conveying pipe 2, the tail end of the conveying pipe 2 is provided with a mixing outlet 3, a feeder 4 is fixedly connected to the air duct 1, a central fan 5 is fixedly connected to the other end of the air duct 1, and spiral ribs 6 arranged in a circumferential array are fixedly connected to the inner walls of the air duct 1 and the conveying pipe 2 respectively.

[0020] Specifically, the pre-homogenized alternative fuel flows from the feeder 4 into the air duct 1. The central fan 5 is started, and a high-speed wind is generated. Under the action of the spiral rib 6, a swirling wind is formed to forwardly convey the alternative fuel particles entering the air duct 1. Since the alternative fuel is mostly granular and the pulverized coal is powdery, there is a speed difference during pneumatic conveying. The alternative fuel particles will settle during conveying, causing the conveying pipe 2 to rotate and continuously lift the settled large particles, so that the large particles enter the kiln along with the air flow under the action of the wind from the mixing outlet 3.

[0021] In an embodiment of the present application, preferably, a secondary air duct 7 is sleeved at one end of the conveying pipe 2 at the mixing outlet 3. The secondary air duct 7 is rotatably connected to the conveying pipe 2. An air supply pipe 8 is connected to the secondary air duct 7, and the other end of the air supply pipe 8 is fixedly connected to a secondary fan 9, which is used to secondarily provide the required combustion air for the alternative fuel entering the kiln for combustion.

[0022] In an embodiment of the present application, preferably, the front end of the secondary air duct 7 is provided with a reduced-diameter tail nozzle 10. The tail nozzle 10 is longer than the mixing outlet 3 and contracts towards the center of the tail nozzle 10, which is used to collect air at the mixing outlet 3 and collect the alternative fuel towards the center of the kiln head by using the secondary air and the tail nozzle 10.

[0023] In an embodiment of the present application, preferably, the feeder 4 includes a spiral cylinder 41. A rotating spiral device 42 is arranged inside the spiral cylinder 41. One end of the spiral cylinder 41 is fixedly connected to a feeding motor 43. The driving shaft of the feeding motor 43 is fixedly connected to the central axis of the spiral device 42. A feeding pipe 44 is fixedly connected to the spiral cylinder 41, which is used to continuously inject the alternative fuel into the air duct 1. The feeding pipe 44 is connected to the alternative fuel pre-homogenization bin.

[0024] In an embodiment of the present application, preferably, the other end of the spiral cylinder 41 is obliquely communicated with the air duct 1 so that the feeding direction is consistent with the air supply direction, which is convenient for taking away the falling alternative fuel when the air duct 1 is ventilated.

[0025] In an embodiment of the present application, preferably, a rotating motor 11 is fixedly connected to the air duct 1, a driven gear 12 is fixedly connected to the conveying pipe 2, and a driving gear 13 is fixedly connected to the driving shaft of the rotating motor 11. The driving gear 13 meshes with the driven gear 12 to drive the conveying pipe 2 to rotate.

[0026] In summary, for the alternative fuel feeding device in the above embodiments of the present utility model, specifically, the pre-homogenized alternative fuel flows from the feeder 4 into the air duct 1. The central fan 5 is started to generate high-speed wind, which forms a swirling wind under the action of the spiral rib 6 to forwardly convey the alternative fuel particles entering the air duct 1. Since most of the alternative fuels are granular and the pulverized coal is powdery, there is a speed difference when the two are pneumatically conveyed. The alternative fuel particles will settle during transportation. The rotation motor 11 is started to rotate the conveying pipe 2, continuously lifting the settled large particles, so that the large particles enter the kiln furnace from the mixing outlet 3 along with the air flow under the action of the wind. The secondary fan 9 is started to introduce combustion-supporting gas into the secondary air duct 7, and the combustion-supporting gas gathers at the center of the tail nozzle 10 to prevent the diffusion of the mixture of alternative fuels before combustion; the spiral rib 6 in the conveying pipe 2 of the device cooperates with the rotating conveying pipe 2 to increase the wind speed of pneumatic conveying, prevent the deposition of large particles of alternative fuels, ensure uniform feeding, and improve the combustion effect.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and are not intended to limit them; although the present utility model 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; and these 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 various embodiments of the present utility model.

Claims

1. A cement kiln alternative fuel feeding device, characterized in that: It includes an air duct, one end of which is rotatably connected to a conveying pipe, the rear end of the conveying pipe is provided with a mixing outlet, the air duct is fixedly connected to a feeder, the other end of the air duct is fixedly connected to a central fan, and the inner walls of the air duct and the conveying pipe are respectively fixedly connected with spiral ribs arranged in a circular array.

2. The cement kiln alternative fuel feeding device according to claim 1, characterized in that: The conveying pipe is sleeved with a secondary air duct at one end of the mixing outlet, the secondary air duct is rotatably connected to the conveying pipe, the secondary air duct is connected to an air supply pipe, and the other end of the air supply pipe is fixedly connected to a secondary fan.

3. The cement kiln alternative fuel feeding device according to claim 2, characterized in that: A tail nozzle with a variable diameter is arranged at the front end of the secondary air duct. The tail nozzle is longer than the mixing outlet and shrinks toward the center of the tail nozzle.

4. The cement kiln alternative fuel feeding device according to claim 1, characterized in that: The feeder comprises a spiral barrel, a rotating screw is arranged inside the spiral barrel, a feeding motor is fixedly connected to one end of the spiral barrel, a driving shaft of the feeding motor is fixedly connected to the central axis of the screw, and a feeding pipe is fixedly connected to the spiral barrel.

5. The cement kiln alternative fuel feeding device according to claim 4, characterized in that: The other end of the spiral drum is connected to the air duct obliquely so that the material feeding direction is consistent with the air supply direction.

6. The cement kiln alternative fuel feeding device according to claim 1, characterized in that: The air duct is fixedly connected with a rotating motor, the delivery pipe is fixedly connected with a driven gear, the driving shaft of the rotating motor is fixedly connected with a driving gear, and the driving gear is meshed with the driven gear.

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