Layered coal injection and single air inlet calcination device

Abstract

The utility model relates to the technical field of cement processing, in particular to a layered coal injection and single air inlet calcining device. According to the technical scheme, the layered coal injection device comprises a conveying pipe, a layered coal injection structure and a feeding structure, a fan is installed at one end of the conveying pipe in a communicating mode, flow guide plates distributed in an annular array mode are arranged in the conveying pipe, flow guide grooves are formed between the flow guide plates, and the layered coal injection structure comprises an upper spray pipe, a horizontal spray pipe and a lower spray pipe. Raw materials such as pulverized coal and carbon black which are independently conveyed into the conveying pipe and used in the cement firing processing process are guided through the guide plate, when single inlet air passes through the guide plate to form vortex airflow, the raw materials are mixed and conveyed into the rotary kiln in a layered mode, and the problems that the carbon black and the pulverized coal need to be mixed in advance, and the mixing efficiency is high are solved. And the problem that the production cost is increased due to additional mixing wrinkles is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cement processing, in particular to a layered coal injection and single air inlet calcining device. Background Art

[0002] During the cement processing process, it needs to be calcined in a rotary kiln. Coal powder is transported through a coal injection pipe to provide calcination fuel for the rotary kiln. Coal powder is usually used as calcination fuel for the rotary kiln, while carbon black can be used as calcination auxiliary fuel.

[0003] After mixing coal powder and carbon black, the two complement each other to form a more uniform fuel combination, which helps to improve the stability of calcination and control the combustion temperature, promote the generation of CO and other carbon monoxide, reduce the emission of oxidizing gases, and is beneficial to environmental protection. However, the carbon black and coal powder need to be mixed in advance, which adds an extra mixing step and increases the production cost. For this reason, we propose a layered coal injection and single air inlet calcination device to solve the existing problems. Utility Model Content

[0004] The utility model aims to solve the problems existing in the background technology and proposes a layered coal injection and single air inlet calcining device.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a stratified coal injection and single air inlet calcining device, comprising a conveying pipe, a stratified coal injection structure and a feeding structure, one end of the conveying pipe is connected to a fan installed, guide plates distributed in a circular array are arranged inside the conveying pipe, guide grooves are arranged between the guide plates, and the stratified coal injection structure comprises an upper nozzle, a horizontal nozzle and a lower nozzle.

[0006] When using a layered coal injection and single air inlet calcining device in this scheme, the coal powder pipe conveys the coal powder into the feeding pipe, the carbon black pipe conveys the carbon black to the feeding pipe, and the feeding pipe conveys the materials that need to be added. The coal powder pipe, the carbon black pipe and the feeding pipe are all controlled to open and close by the electromagnetic valve to control the delivery amount of the fired raw materials generated during the cement firing process. The fan conveys a unidirectional airflow to convey the coal powder, carbon black and other raw materials delivered to the inside of the conveying pipe. In addition, multiple raw materials are conveyed by a single air inlet using the same air source. The raw materials and the airflow during cement firing are connected through the airflow. When the guide plates are installed, part of the raw materials are conveyed in a rotating manner along the guide grooves formed between the guide plates. In this process, vortex airflow is formed, and the materials are mixed in the logistics airflow, which avoids the need to mix the materials in advance using equipment. The materials are directly mixed during the feeding process, and the materials are conveyed at multiple points through the layered coal injection structure. They are conveyed to the upper end of the rotary kiln through the upper nozzle, conveyed to the center of the rotary kiln through the horizontal nozzle, and conveyed to the lower end of the rotary kiln through the lower nozzle. The fuel is calcined at multiple points inside the rotary kiln, which makes the raw materials calcined more fully.

[0007] Preferably, the feeding structure includes a pulverized coal pipe, a carbon black pipe and a feed pipe. The pulverized coal pipe conveys pulverized coal into the feeding pipe, the carbon black pipe conveys carbon black to the feeding pipe, and the feed pipe conveys materials that need to be added additionally.

[0008] Preferably, the upper end of the conveying pipe is connected to a feed pipe, and the pulverized coal pipe, carbon black pipe and feed pipe all pass through the feed pipe. The pulverized coal pipe, carbon black pipe and feed pipe directly convey materials into the same feed pipe and enter the conveying pipe together.

[0009] Preferably, the guide plate has an angle of 300° with the conveying pipe as the center, and a chamfer 1 is provided at the connection between the guide plate and the conveying pipe. The angle of the guide plate with the conveying pipe as the center is 300°, so that the material and the airflow flow in a circular shape when traveling, and the chamfer 1 reduces the resistance of the material and the airflow when passing through.

[0010] Preferably, the angle between the upper nozzle, the lower nozzle and the horizontal nozzle is 45°. The fuel is transported horizontally and sprayed at an angle of 45° upward and 45° downward.

[0011] Preferably, the upper nozzle, the lower nozzle and the horizontal nozzle are all provided with chamfers 2 at the inner corners of the inner walls thereof, so as to reduce the resistance of the material and the airflow when they flow through the upper nozzle, the lower nozzle and the horizontal nozzle.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model directly conveys pulverized coal and carbon black into the conveying pipe together, and conveys carbon black and pulverized coal at the same time through a separate air intake through a fan. During the conveying process, the pulverized coal and carbon black flow along the guide plate through the guide plate, and the single air intake is guided by the guide plate to form a vortex. In the vortex-shaped airflow, the carbon black and pulverized coal are mixed and conveyed in layers through a layered coal injection structure. The mixed fuel is conveyed simultaneously inside the upper end, the center position and the lower end of the rotary kiln, thereby avoiding the pre-mixing process, reducing the production cost, and improving the calcination effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the main three-dimensional structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the internal three-dimensional structure of the delivery pipe of the utility model;

[0016] Figure 3 It is a schematic diagram of the main cross-sectional three-dimensional structure of the layered coal injection structure of the utility model;

[0017] Figure 4 It is a schematic diagram of the main sectional three-dimensional structure of the feeding structure of the utility model.

[0018] Figure numerals: 1. fan; 2. conveying pipe; 201. guide plate; 202. guide groove; 203. chamfer one; 3. feeding pipe; 4. layered coal injection structure; 401. lower nozzle; 402. horizontal nozzle; 403. upper nozzle; 404. chamfer two; 5. feeding structure; 501. feeding pipe; 502. pulverized coal pipe; 503. carbon black pipe. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1-Figure 4 As shown, the utility model proposes a layered coal injection and single air inlet calcining device, comprising a conveying pipe 2, a layered coal injection structure 4 and a feeding structure 5, one end of the conveying pipe 2 is connected to a fan 1, and guide plates 201 distributed in a circular array are arranged inside the conveying pipe 2, and guide grooves 202 are arranged between the guide plates 201, and the layered coal injection structure 4 includes an upper nozzle 403, a horizontal nozzle 402 and a lower nozzle 401;

[0021] The feeding structure 5 includes a pulverized coal pipe 502, a carbon black pipe 503 and a feed pipe 501;

[0022] The upper end of the conveying pipe 2 is connected to a feed pipe 3, and the pulverized coal pipe 502, the carbon black pipe 503 and the feed pipe 501 all pass through the feed pipe 3;

[0023] The angle of the guide plate 201 with the delivery pipe 2 as the center is 300°, and a chamfer 203 is provided at the connection between the guide plate 201 and the delivery pipe 2;

[0024] The angle between the upper nozzle 403, the lower nozzle 401 and the horizontal nozzle 402 is 45°;

[0025] The upper nozzle 403, the lower nozzle 401 and the horizontal nozzle 402 are all provided with chamfers 404 at the inner corners.

[0026] Based on the implementation steps of Example 1: the fan 1 delivers a unidirectional airflow, so that raw materials such as coal powder and carbon black are transported to the corresponding conveying pipe 2. The single air inlet reduces the equipment for additional airflow transportation and reduces costs. The material is transported in a rotating manner along the guide groove 202 formed between the guide plates 201 to form a vortex airflow to achieve material mixing, eliminating the step of using equipment for mixing in advance. The upper, horizontal and lower nozzles 401 are used to transport the raw materials to different areas in the rotary kiln respectively, realizing multi-point transportation and promoting more complete calcination of the material inside the rotary kiln. In this equipment, the layered coal injection and single air inlet calcination device transport the raw materials and airflow to the inside of the rotary kiln in layers through multiple nozzles to achieve the effect of multi-point calcination, which is beneficial to improving the uniformity and thoroughness of the calcination process, and can reduce the demand for other mixing equipment and conveying equipment, thereby saving energy and space, improving the fuel utilization efficiency in the cement production process, and saving energy costs.

[0027] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A layered coal injection and single air inlet calcining device, comprising a conveying pipe (2), a layered coal injection structure (4) and a feeding structure (5), characterized in that: One end of the delivery pipe (2) is connected to a fan (1) installed thereon, guide plates (201) distributed in a ring array are arranged inside the delivery pipe (2), guide grooves (202) are arranged between the guide plates (201), and the layered coal injection structure (4) comprises an upper nozzle (403), a horizontal nozzle (402) and a lower nozzle (401).

2. The layered coal injection and single air inlet calcining device according to claim 1, characterized in that: The feeding structure (5) comprises a coal powder pipe (502), a carbon black pipe (503) and a feeding pipe (501).

3. The layered coal injection and single air inlet calcining device according to claim 2 is characterized in that: The upper end of the conveying pipe (2) is connected to a feed pipe (3), and the pulverized coal pipe (502), the carbon black pipe (503) and the feed pipe (501) all pass through the feed pipe (3).

4. The layered coal injection and single air inlet calcining device according to claim 1, characterized in that: The angle of the guide plate (201) with the delivery pipe (2) as the center is 300°, and a chamfer (203) is provided at the connection between the guide plate (201) and the delivery pipe (2).

5. The layered coal injection and single air inlet calcining device according to claim 1 is characterized in that: The included angles between the upper nozzle (403), the lower nozzle (401) and the horizontal nozzle (402) are 45°.

6. The layered coal injection and single air inlet calcining device according to claim 1, characterized in that: The upper nozzle (403), the lower nozzle (401) and the horizontal nozzle (402) are all provided with chamfers (404) at the inner corners of the inner walls.

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