Pulverized coal and coal gas co-combustion device for Merz double-chamber lime kiln

Abstract

The utility model relates to a pulverized coal and coal gas co-combustion device for a Merz double-chamber lime kiln, and belongs to the technical field of lime calcination equipment in the metallurgical industry. According to the technical scheme, the device comprises a coal gas access pipe (1), a pulverized coal access pipe (2), a spray gun flange (3), a double-pipeline parallel combined spray gun pipe (4), a kiln shell (9) and an elbow (10), the coal gas access pipe (1) and the pulverized coal access pipe (2) are fixed to the kiln shell (9) through the spray gun flange (3), and the coal gas access pipe (1) and the pulverized coal access pipe (2) are transversely arranged up and down; the double-pipeline parallel combined spray gun pipe (4) consists of two pipelines which are vertically arranged in parallel, the upper ends of the two pipelines are respectively connected with the coal gas access pipe (1) and the pulverized coal access pipe (2) through an elbow (10), the lower ends of the two pipelines extend into a kiln to form a spray gun opening, and a cavity between the two pipelines is filled with a wear-resistant material. The pulverized coal and coal gas dual-fuel combustion device has the advantage that the purpose of pulverized coal and coal gas dual-fuel combustion is achieved.

Description

Technical Field

[0001] The utility model relates to a coal powder and coal gas mixed burning device used for a Maerz double-chamber lime kiln, belonging to the technical field of lime calcining equipment in the metallurgical industry. Background Art

[0002] The existing Maerz lime kiln calcining devices generally use a single fuel. When two or more fuels are mixed and fired, two methods are commonly used: one is pre-mixing before the kiln, which has a complex process design, large investment, and the uniformity of the fuel calorific value cannot be guaranteed; the other is separate use, that is, pulverized coal and gas fuel are used in stages, which cannot achieve a long-term mixed firing economic effect. Therefore, with the development of equipment technology in the metallurgical lime industry, a dual-fuel mixed firing device is needed. Utility Model Content

[0003] The utility model aims to provide a pulverized coal and gas mixed combustion device for a Maerz double-chamber lime kiln, so as to achieve the purpose of dual-fuel combustion of pulverized coal and gas and solve the problems existing in the background technology.

[0004] The technical solution of the utility model is:

[0005] A pulverized coal and coal gas mixed combustion device for a Maerz double-chamber lime kiln comprises a gas inlet pipe, a pulverized coal inlet pipe, a spray gun flange, a double-pipeline parallel combination spray gun pipe, a kiln shell and an elbow. The gas inlet pipe and the pulverized coal inlet pipe are fixed to the kiln shell through the spray gun flange, and the gas inlet pipe and the pulverized coal inlet pipe are arranged horizontally up and down; the double-pipeline parallel combination spray gun pipe is composed of two pipelines vertically arranged in parallel, the upper ends of the two pipelines are respectively connected to the gas inlet pipe and the pulverized coal inlet pipe through an elbow, the lower ends of the two pipelines extend into the kiln to form a spray gun port, and the cavity between the two pipelines is filled with wear-resistant material.

[0006] The wear-resistant material filled in the middle cavity of the two pipelines in the double-pipeline parallel combined spray gun pipe is Al2O3 composite wear-resistant material.

[0007] The two pipelines in the double-pipeline parallel combination spray gun pipe are a thick pipeline and a thin pipeline. The thick pipeline is connected to the gas inlet pipe, and the thin pipeline is connected to the coal powder inlet pipe.

[0008] The elbow is sleeved with an elbow protection sleeve.

[0009] Al2O3 composite wear-resistant material is filled between the elbow protection sleeve and the elbow.

[0010] A spray gun protection box matching with the double-pipeline parallel combined spray gun pipe is prefabricated on the outside of the kiln shell.

[0011] The beneficial effects of the utility model are as follows: the pulverized coal and coal gas dual fuels form a mixed state when sprayed out of the spray gun port, and the mixed fuels can start to burn synchronously, with high combustion safety, achieving the purpose of pulverized coal and coal gas dual fuel combustion, and can also be flexibly converted into a single fuel. It is suitable for the mixed combustion of fuels with lower calorific value and fuels with higher calorific value, with obvious economic benefits and up-to-standard environmental protection measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the utility model's two groups of coal powder and gas mixed combustion structure;

[0013] Figure 2 for Figure 1 AA section view;

[0014] Figure 3 This is a schematic diagram of the uniform distribution of spray guns in the kiln chamber of the utility model;

[0015] In the figure: 1. Gas inlet pipe; 2. Coal powder inlet pipe; 3. Spray gun flange; 4. Double-pipeline parallel combination spray gun pipe; 5. Spray gun support rail; 6. Spray gun protection box; 7. Elbow protection sleeve; 8. Double-pipeline middle cavity filled with wear-resistant material; 9. Kiln shell; 10. Elbow; DETAILED DESCRIPTION

[0016] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0017] Refer to the attached Figure 1-3 A pulverized coal and gas mixed combustion device for a Maerz double-chamber lime kiln comprises a gas inlet pipe 1, a pulverized coal inlet pipe 2, a spray gun flange 3, a double-pipeline parallel combination spray gun pipe 4, a kiln shell 9 and an elbow 10. The gas inlet pipe 1 and the pulverized coal inlet pipe 2 are fixed to the kiln shell 9 through the spray gun flange 3, and the gas inlet pipe 1 and the pulverized coal inlet pipe 2 are arranged horizontally up and down; the double-pipeline parallel combination spray gun pipe 4 is composed of two pipelines vertically arranged in parallel, the upper ends of the two pipelines are respectively connected to the gas inlet pipe 1 and the pulverized coal inlet pipe 2 through an elbow 10, the lower ends of the two pipelines extend into the kiln to form a spray gun port, and the cavity between the two pipelines is filled with wear-resistant material.

[0018] When the pulverized coal and gas mixed combustion device is used in a Maerz double-chamber lime kiln, it can be used as a set. Each set can include a group of gas inlet pipes 1, pulverized coal inlet pipes 2 and double-pipeline parallel combination spray gun pipes 4, or it can include two or three groups of gas inlet pipes 1, pulverized coal inlet pipes 2 and double-pipeline parallel combination spray gun pipes 4.

[0019] In this embodiment, the attached Figure 1 It is a schematic diagram of the structure of two groups of mixed combustion of pulverized coal and gas. Two groups of gas pipes 1 and pulverized coal pipes 2 are fixed on the spray gun flange 3 using installation kits respectively. The spray gun flange 3 is fixed on the kiln shell 9 with evenly distributed M16 bolts.

[0020] The gas inlet pipe 1 and the pulverized coal inlet pipe 2 in the two groups are both installed horizontally up and down. The height difference between the gas pipe 1 and the pulverized coal pipe 2 in each group is 500mm, and the length difference is 750mm.

[0021] The double-pipeline parallel combination spray gun pipes 4 in the two groups are arranged vertically, with one thick and one thin double pipe, and the thickness of the middle cavity is 10mm. The cavity is filled with Al2O3 composite wear-resistant material, such as the attached Figure 2 shown.

[0022] The double-pipeline parallel combination spray gun pipes 4 in the two groups are prefabricated outside the kiln and installed in a spray gun protection box 6 as a whole.

[0023] The elbow protection sleeve 7 is made of high manganese steel, with a wall thickness of 10mm and a material of ZGMn13-2;

[0024] The elbow protection tube 7 is filled with Al2O3 composite wear-resistant material;

[0025] The support rail 5 is installed to support the entire gun body.

[0026] Attached Figure 3 Schematic diagram of the overall arrangement of the spray guns in the kiln chamber of the utility model, evenly arranged along the kiln shell 9, a total of 16 spray gun protection boxes 6, one of the spray gun protection boxes 6 is arranged with three sets of the device, as shown in the attached Figure 3 C in the figure, two sets of the device are installed in the remaining 15 spray gun protection boxes 6, as shown in the attached Figure 3 A and B in .

[0027] The workflow of this utility model is as follows:

[0028] During operation, pulverized coal enters the spray gun horizontal pipe from the pulverized coal port 2 and coal gas enters the gas port 1 at the same time; when pulverized coal and coal gas are sprayed out from the parallel combination spray gun vertical pipe port, a mixed fuel is formed; the mixed fuel is mixed with the combustion-supporting air here and burns when encountering an open flame to calcine the limestone; when a calcination cycle of the kiln body is completed, the input of pulverized coal and coal gas is stopped at the same time, compressed air is continuously introduced into the pulverized coal pipe, and the gas pipeline opens the spray gun cooling air for cooling. When waiting for the next calcination cycle to start, the cooling air of the gas pipeline is cut off, and the gas is started to be input. The pulverized coal pipeline simultaneously inputs pulverized coal, and the calcination cycle is repeated to achieve the mixed combustion of pulverized coal and gas.

Claims

1. A coal powder and coal gas mixed combustion device for Maerz double-chamber lime kiln, characterized by: The invention comprises a gas inlet pipe (1), a pulverized coal inlet pipe (2), a spray gun flange (3), a double-pipeline parallel combination spray gun pipe (4), a kiln shell (9) and an elbow (10). The gas inlet pipe (1) and the pulverized coal inlet pipe (2) are fixed to the kiln shell (9) through the spray gun flange (3). The gas inlet pipe (1) and the pulverized coal inlet pipe (2) are arranged horizontally up and down. The double-pipeline parallel combination spray gun pipe (4) is composed of two pipelines vertically arranged in parallel. The upper ends of the two pipelines are connected to the gas inlet pipe (1) and the pulverized coal inlet pipe (2) through an elbow (10) respectively. The lower ends of the two pipelines extend into the kiln to form a spray gun port. The cavity between the two pipelines is filled with wear-resistant material.

2. The device for mixed combustion of pulverized coal and coal gas for Maerz double-chamber lime kiln according to claim 1, characterized in that: The wear-resistant material filled in the middle cavity of the two pipelines in the double-pipeline parallel combined spray gun pipe (4) is Al2O3 composite wear-resistant material.

3. A coal powder and coal gas mixed combustion device for Maerz double-chamber lime kiln according to claim 1 or 2, characterized in that: The two pipelines in the double-pipeline parallel combination spray gun pipe (4) are a thick pipeline and a thin pipeline, the thick pipeline is connected to the coal gas access pipe (1), and the thin pipeline is connected to the coal powder access pipe (2).

4. The device for mixed combustion of pulverized coal and coal gas for Maerz double-chamber lime kiln according to claim 1, characterized in that: The elbow (10) is sleeved with an elbow protection sleeve (7).

5. The device for mixed combustion of pulverized coal and coal gas for Maerz double-chamber lime kiln according to claim 4, characterized in that: Al2O3 composite wear-resistant material is filled between the elbow protection sleeve (7) and the elbow (10).

6. The device for mixed combustion of pulverized coal and coal gas for Maerz double-chamber lime kiln according to claim 1, characterized in that: The kiln shell (9) is prefabricated with a spray gun protection box (6) that matches the double-pipeline parallel combination spray gun pipe (4).

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