Pulverized coal and calcium carbide furnace tail gas mixed calcining device for double-chamber kiln

Abstract

The utility model relates to the technical field of double-chamber kiln combustion equipment, in particular to a pulverized coal and calcium carbide furnace tail gas mixed calcining device for a double-chamber kiln, which comprises a double-chamber kiln body, the double-chamber kiln body comprises two kiln bodies and a through pipe for communicating the two kiln bodies, a combustion chamber is arranged in each kiln body, and an annular shell is arranged on the outer side of each kiln body. An annular cavity is formed between the annular shells and the kiln body, the two annular shells are communicated through a connecting pipe, the connecting pipe is provided with a pulverized coal box communicated with the connecting pipe, the connecting pipe is provided with two driving devices used for conveying pulverized coal into the annular cavity, and the annular shells are provided with a high-pressure calcium carbide furnace tail gas pipe communicated with the annular cavity. A guide pipe communicated with the annular cavity is wound on the outer wall of the kiln body, the lower end of the guide pipe penetrates through the kiln body and is arranged in the combustion chamber, pulverized coal and tail gas of the calcium carbide furnace are mixed for combustion, the combustion efficiency is improved, and waste gas can be recycled.

Description

Technical Field

[0001] This utility model relates to the technical field of double-chamber kiln combustion equipment, specifically to a pulverized coal and calcium carbide furnace tail gas mixing and calcining device used in double-chamber kilns. Background Technology

[0002] A double-chamber kiln is a highly efficient and energy-saving industrial kiln widely used for calcining minerals such as limestone and dolomite. Traditional double-chamber kilns typically use a single fuel (such as tail gas from a calcium carbide furnace, natural gas, or pulverized coal) for calcination, which presents the following problems:

[0003] 1. The combustion efficiency of a single fuel is limited, making it difficult to achieve optimal thermal energy recycling and energy conservation and emission reduction;

[0004] 2. Poor fuel adaptability, making it difficult to flexibly adjust fuel ratios according to production needs. Utility Model Content

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A pulverized coal and calcium carbide furnace tail gas mixing and calcining device for a double-chamber kiln includes a double-chamber kiln body, which comprises two kiln bodies and a connecting pipe for connecting the two kiln bodies. A combustion chamber is provided within each kiln body. An annular outer shell is provided on the outer side of each kiln body, forming an annular cavity between the annular outer shell and the kiln body. The two annular outer shells are connected by a connecting pipe. A pulverized coal box is provided on the connecting pipe, which is connected to the connecting pipe. The connecting pipe is equipped with two driving devices for conveying pulverized coal into the annular cavity. A high-pressure calcium carbide furnace tail gas pipe is provided on the annular outer shell, which is connected to the annular cavity. A conduit connected to the annular cavity is wound around the outer wall of the kiln body, and the lower end of the conduit passes through the kiln body and is located within the combustion chamber.

[0007] A further technical solution is that the driving device includes two motors arranged opposite each other inside the connecting pipe, and the output ends of the two motors are provided with rotating shafts, and the rotating shafts are provided with spiral pushing blades.

[0008] A further technical solution is that the bottom of the pulverized coal box is provided with two first through holes, the connecting pipe is provided with a second through hole that communicates with the first through holes, and both sides of the pulverized coal box are provided with sliding grooves. The two sliding grooves are respectively connected to the two first through holes, and baffles are slidably provided in the two sliding grooves.

[0009] A further technical solution is that the conduit includes a vertical tube and an arc-shaped tube. The upper end of the vertical tube passes through the annular outer shell and is connected to the annular cavity. Its lower end is connected to the upper end of the arc-shaped tube. The arc-shaped tube is wound around the outside of the kiln body, and its lower end passes through the kiln body and is disposed in the combustion chamber.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] 1. By using pulverized coal and calcium carbide furnace exhaust gas for mixed combustion, combustion efficiency can be improved and the waste gas can be recycled and reused.

[0012] 2. By winding and placing the conduit inside the kiln, the mixed combustibles inside the kiln are preheated, making them easier to burn after entering the combustion chamber.

[0013] 3. By combining pulverized coal and high-pressure calcium carbide furnace tail gas pipes, it is easy to flexibly distribute fuel and adjust the fuel ratio. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a coal powder and calcium carbide furnace tail gas mixing and calcining device used in a double-chamber kiln according to the present invention.

[0015] Figure 2 This is a schematic diagram of the installation of the conduit in this utility model. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0017] Example:

[0018] refer to Figures 1 to 2As shown, a pulverized coal and calcium carbide furnace tail gas mixing and calcining device for a double-chamber kiln is disclosed, including a double-chamber kiln body 1. The double-chamber kiln body 1 includes two kiln bodies 2 and a connecting pipe 3 for connecting the two kiln bodies 2. A combustion chamber 4 is provided inside the kiln body 2. An annular shell 5 is provided on the outside of the kiln body 2. The annular shell 5 and the kiln body 2 form a closed annular cavity 6. The two annular shells 5 are connected by a connecting pipe 7. A pulverized coal box 8 is provided on the connecting pipe 7 and is connected to the connecting pipe 7. The connecting pipe 7 is provided with two driving devices for conveying pulverized coal into the annular cavity 6. A high-pressure calcium carbide furnace tail gas pipe 9 is provided on the annular shell 5 and is connected to the annular cavity 6. A conduit connected to the annular cavity 6 is wound around the outer wall of the kiln body 2. The lower end of the conduit passes through the kiln body 2 and is located in the combustion chamber 4.

[0019] In this invention, pulverized coal and calcium carbide furnace exhaust gas are mixed and burned, which improves combustion efficiency and allows for the recycling of waste gas. By winding a conduit inside the kiln body 2, the mixed combustible material inside the kiln body 2 is preheated, making it easier to burn after entering the combustion chamber 4. The combination of pulverized coal and high-pressure calcium carbide furnace exhaust gas pipe 9 facilitates flexible fuel mixing and allows for flexible adjustment of fuel ratios.

[0020] The driving device includes two opposing motors 10 disposed in the connecting pipe 7. The output ends of the two motors 10 are provided with rotating shafts 11, and the rotating shafts 11 are provided with spiral pusher blades 12.

[0021] The bottom of the pulverized coal box 8 is provided with two first through holes, and the connecting pipe 7 is provided with a second through hole that communicates with the first through holes. Both sides of the pulverized coal box 8 are provided with sliding grooves, and the two sliding grooves are respectively connected to the two first through holes. Baffles 13 are slidably provided in both sliding grooves.

[0022] The pulverized coal is passed through the first and second through holes by the sliding baffle 13 and falls into the connecting pipe 7. The motor 10 drives the rotating shaft 11 to rotate, and the spiral pusher blade 12 on the rotating shaft 11 pushes the pulverized coal into the annular cavity 6 during the rotation.

[0023] The amount of pulverized coal discharged is controlled by controlling the rotation speed of the motor 10 and the baffle 13 blocking the first through hole.

[0024] High-pressure gas input from the high-pressure calcium carbide furnace tail gas pipe 9 drives the pulverized coal to mix and is discharged from the conduit. Specifically, the conduit includes a vertical pipe 14 and an arc-shaped pipe 15. The upper end of the vertical pipe 14 passes through the annular outer shell 5 and is connected to the annular cavity 6. Its lower end is connected to the upper end of the arc-shaped pipe 15. The arc-shaped pipe 15 is wound around the outside of the kiln body 2, and its lower end passes through the kiln body 2 and is located in the combustion chamber 4.

[0025] The mixture, which is mixed with pulverized coal by high-pressure gas, is discharged from the vertical pipe 14 to the arc-shaped pipe 15. When passing through the arc-shaped pipe 15, since the arc-shaped pipe 15 is designed to wrap around the kiln body 2, the temperature outside the kiln body 2 is provided to preheat the mixture inside the arc-shaped pipe 15, making it easier to burn after entering the combustion chamber 4, thereby improving the combustion efficiency of the mixture.

[0026] Although the present invention has been described herein with reference to several illustrative embodiments, it should be understood that many other modifications and implementations can be devised by those skilled in the art, which will fall within the scope and spirit of the principles disclosed herein. More specifically, various variations and modifications can be made to the components and / or layout of the subject matter combination within the scope of the disclosure, drawings, and claims. Besides variations and modifications to the components and / or layout, other uses will be apparent to those skilled in the art.

Claims

1. A device for mixing and calcining pulverized coal and calcium carbide furnace tail gas in a double-chamber kiln, characterized in that: The system includes a double-chamber kiln body, comprising two kiln bodies and a connecting pipe for connecting the two kiln bodies. Each kiln body has a combustion chamber, and each kiln body has an annular outer shell forming an annular cavity with the kiln body. The two annular outer shells are connected by a connecting pipe, which has a pulverized coal box connected to it. The connecting pipe has two driving devices for conveying pulverized coal into the annular cavity. Each annular outer shell has a high-pressure calcium carbide furnace tail gas pipe connected to the annular cavity. The outer wall of the kiln body is wound with a conduit connected to the annular cavity, the lower end of which passes through the kiln body and is located within the combustion chamber.

2. The pulverized coal and calcium carbide furnace tail gas mixing and calcining device for a double-chamber kiln according to claim 1, characterized in that: The driving device includes two motors arranged opposite each other inside the connecting pipe. The output ends of the two motors are provided with rotating shafts, and the rotating shafts are provided with spiral pusher blades.

3. The pulverized coal and calcium carbide furnace tail gas mixing and calcining device for a double-chamber kiln according to claim 2, characterized in that: The bottom of the pulverized coal box is provided with two first through holes, and the connecting pipe is provided with a second through hole that communicates with the first through holes. Both sides of the pulverized coal box are provided with sliding grooves, and the two sliding grooves are respectively connected to the two first through holes. Baffles are slidably provided in the two sliding grooves.

4. The pulverized coal and calcium carbide furnace tail gas mixing and calcining device for a double-chamber kiln according to claim 1, characterized in that: The conduit includes a vertical tube and an arc-shaped tube. The upper end of the vertical tube passes through the annular outer shell and is connected to the annular cavity. Its lower end is connected to the upper end of the arc-shaped tube. The arc-shaped tube is wound around the outside of the kiln body, and its lower end passes through the kiln body and is disposed in the combustion chamber.

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