A simple sampling system for blast furnace coal gas with lowered material line

Abstract

The utility model relates to blast furnace descending material line technology field, disclose a kind of blast furnace descending material line coal gas simple sampling system, comprising: furnace top gas output end, the output of furnace top gas output end is connected with gas pipeline, the one end of gas pipeline close to furnace top gas output end is equipped with first cut-off valve, the one end of gas pipeline close to first cut-off valve is connected with second cut-off valve by tee joint, and gas pipeline is connected with the nitrogen of reverse blowing effect by second cut-off valve, avoid pipeline blockage's medium-pressure nitrogen.The blast furnace descending material line coal gas simple sampling system is provided with gas diffusion end and sample discharge diffusion end, which can be set in low-risk air circulation, thereby reducing the risk of blast furnace top sampling;At the same time, by improving the structure of gas pipeline, thereby reducing the condensation of water vapor in the gas pipeline, reducing the corrosion of water vapor to the gas pipeline, while improving the purity of sampling gas.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace decompression line shutdown technology, specifically a simple gas sampling system for blast furnace decompression lines. Background Technology

[0002] The blast furnace decompression shutdown is based on the change in CO2 concentration in the gas to determine the depth of the decompression line. In addition, from a safety perspective, the concentration requirements for H2 and O2 in the gas are very strict during the decompression process. Therefore, the efficiency, speed and accuracy of gas sampling will directly affect the quality of the blast furnace decompression line.

[0003] During the conventional blast furnace gas lowering process, due to the large volume of water pumped, the raw blast furnace gas mixed with water vapor at the gas sampling outlet of the blast furnace gas riser pipe can easily clog the sampling hole, resulting in situations such as inability to sample or gas samples containing too much impurity (moisture) to be tested. To address this, we propose a simplified gas sampling system for blast furnace gas lowering. Utility Model Content

[0004] The purpose of this invention is to provide a simple gas sampling system for blast furnace feed line to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a simple sampling system for blast furnace feed line gas, comprising:

[0006] The furnace top gas outlet is connected to a gas pipeline. A first shut-off valve is installed at the end of the gas pipeline closest to the furnace top gas outlet. A second shut-off valve is connected to the end of the gas pipeline closest to the first shut-off valve via a tee. Medium-pressure nitrogen gas, which serves to backflush and prevent pipe blockage, is also connected to the end of the gas pipeline furthest from the first shut-off valve via a tee. The other end of the third shut-off valve... One end of the gas pipeline is connected to a gas venting end. The end of the gas pipeline away from the gas output end at the top of the furnace is equipped with a fourth shut-off valve. The other end of the fourth shut-off valve is connected to a venting shut-off valve via a gas pipeline. The other end of the venting shut-off valve is connected to a sampling venting end via a gas pipeline. The inner sides of the fourth shut-off valve and the venting shut-off valve are connected to a sampling shut-off valve via a tee and a gas pipeline. The other end of the sampling shut-off valve is connected to a gas sampling end via a gas pipeline.

[0007] Furthermore, the gas outlet at the top of the furnace is connected to the gas venting end via a gas pipeline, a first shut-off valve, and a third shut-off valve, and the medium-pressure nitrogen is connected to the gas pipeline via a second shut-off valve.

[0008] Furthermore, the top gas output terminal is connected to the gas sampling terminal via the first shut-off valve, the fourth shut-off valve, and the sampling shut-off valve, and the top gas output terminal is connected to the discharge and venting terminal via the first shut-off valve, the fourth shut-off valve, and the venting shut-off valve.

[0009] Furthermore, the first shut-off valve, the second shut-off valve, the third shut-off valve, the fourth shut-off valve, the vent shut-off valve, and the sampling shut-off valve are all used for the opening and closing control of different passages in the gas pipeline.

[0010] Furthermore, the innermost layer of the gas pipeline is provided with a composite ceramic lining, the outer wall of the composite ceramic lining is covered with a metal pipe shell, the outer wall of the metal pipe shell is fitted with a rubber and plastic insulation sleeve, and the inner wall of the composite ceramic lining is coated with a nano-ceramic coating.

[0011] Furthermore, the rubber-plastic insulation sleeve forms an enclosing structure between the metal tube shell and the composite ceramic liner, and the rubber-plastic insulation sleeve and the metal tube shell form a detachable structure.

[0012] Furthermore, a heating ring is fitted on the outer wall of the gas pipeline, and a heat-conducting seat is fixed on the upper outer wall of the heating ring. A heating wire is threaded through the inner side of the heat-conducting seat. The heating ring is evenly distributed at equal intervals along the outer wall of the gas pipeline, and the heating wire is tightly fitted with the heat-conducting seat.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] The simplified gas sampling system for the blast furnace charging line is equipped with a gas venting end and a sample discharge venting end, which can be set in a low-risk air circulation area, thereby reducing the danger of sampling from the top of the blast furnace. At the same time, by improving the structure of the gas pipeline, the system reduces water vapor condensation in the gas pipeline, reduces water vapor corrosion of the gas pipeline, and improves the purity of the sampled gas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the sampling system structure of this utility model;

[0016] Figure 2 This is an enlarged cross-sectional view of the gas pipeline section of this utility model;

[0017] Figure 3 This is a schematic diagram of the heating state of the gas pipeline section of this utility model.

[0018] In the diagram: 1. Gas outlet at the top of the furnace; 2. Gas pipeline; 3. First shut-off valve; 4. Second shut-off valve; 5. Third shut-off valve; 6. Gas venting end; 7. Fourth shut-off valve; 8. Venting shut-off valve; 9. Sampling venting end; 10. Sampling shut-off valve; 11. Gas sampling end; 12. Composite ceramic lining; 13. Metal pipe shell; 14. Rubber and plastic insulation sleeve; 15. Nano-ceramic coating; 16. Heating ring; 17. Heat-conducting base; 18. Heating wire. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides an improved, simplified gas sampling system for blast furnace feed line. Please refer to [link / reference]. Figure 1The system includes: a top gas outlet 1, with a gas pipeline 2 connected to the outlet of the top gas outlet 1; a first shut-off valve 3 installed at one end of the gas pipeline 2 near the top gas outlet 1; and a second shut-off valve 4 connected to the other end of the gas pipeline 2 near the first shut-off valve 3 via a tee. The gas pipeline 2 is also connected to medium-pressure nitrogen via the second shut-off valve 4 for backflushing to prevent pipe blockage. The medium-pressure nitrogen is connected to the gas pipeline 2 via the second shut-off valve 4. One end of pipeline 2, away from the first shut-off valve 3, is connected to a third shut-off valve 5 via a tee. The other end of the third shut-off valve 5 is connected to a gas venting end 6 via gas pipeline 2. The furnace top gas output end 1 is connected to the gas venting end 6 via gas pipeline 2, the first shut-off valve 3, and the third shut-off valve 5. The gas venting end 6, separated from the gas pipeline 2, is easily placed in the air circulation area of ​​the original gas and explosion hazard zone, effectively eliminating the danger of sampling from the blast furnace top, thereby reducing the risk of gas leakage. The risk of carbon monoxide poisoning for samplers is mitigated. A fourth shut-off valve 7 is installed at the end of the gas pipeline 2 furthest from the furnace top gas outlet 1. The other end of the fourth shut-off valve 7 is connected to a vent shut-off valve 8 via the gas pipeline 2. The other end of the vent shut-off valve 8 is connected to a sample discharge vent 9 via the gas pipeline 2. The furnace top gas outlet 1 is connected to the sample discharge vent 9 via a first shut-off valve 3, a fourth shut-off valve 7, and a vent shut-off valve 8. The internal components of the fourth shut-off valve 7 and the vent shut-off valve 8... A sampling shut-off valve 10 is connected to the gas pipeline 2 via a tee. The first shut-off valve 3, the second shut-off valve 4, the third shut-off valve 5, the fourth shut-off valve 7, the vent shut-off valve 8, and the sampling shut-off valve 10 are all used for opening and closing control of different passages of the gas pipeline 2. The other end of the sampling shut-off valve 10 is connected to a gas sampling end 11 via the gas pipeline 2. The gas output end 1 at the furnace top is connected to the gas sampling end 11 through the first shut-off valve 3, the fourth shut-off valve 7, and the sampling shut-off valve 10.

[0021] Please see Figure 2A simplified gas sampling system for a blast furnace charging line includes: a composite ceramic lining 12 installed on the innermost layer of the gas pipeline 2; a metal shell 13 covering the outer wall of the composite ceramic lining 12; and a rubber-plastic insulation sleeve 14 fitted onto the outer wall of the metal shell 13. The rubber-plastic insulation sleeve 14 forms an enclosure structure between the metal shell 13 and the composite ceramic lining 12, and the rubber-plastic insulation sleeve 14 and the metal shell 13 form a detachable structure. The rubber-plastic insulation sleeve 14 and the composite ceramic lining 12 are used to improve the entire raw gas pipeline system. The purpose of the insulation treatment is to maintain the pipe wall temperature above the dew point temperature of the gas, thereby preventing water vapor from condensing on the inner wall and reducing the corrosive effect of the attached water vapor on the gas pipeline 2. The inner wall of the composite ceramic lining 12 is coated with a nano-ceramic coating 15. The nano-ceramic coating 15 is used to form a hydrophobic coating on the inner wall of the composite ceramic lining 12, so that water droplets form nearly spherical liquid droplets, which drip quickly on the inner wall of the gas pipeline 2, preventing the phenomenon of wall adhesion. This reduces the moisture content of the gas sampled at the gas sampling end 11, making the sampled gas purer.

[0022] Please see Figure 2 A simplified gas sampling system for a blast furnace feed line includes: a heating ring 16 fitted on the outer wall of the gas pipeline 2, which heats the gas pipeline 2 to maintain it at a higher temperature and further prevents water droplets from adsorbing onto the inner wall of the gas pipeline 2, thus affecting the quality of the sampled gas; a heat-conducting seat 17 is fixed to the upper outer wall of the heating ring 16, and a heating wire 18 is threaded through the inner side of the heat-conducting seat 17; the heating ring 16 is evenly distributed at equal intervals along the outer wall of the gas pipeline 2, and the heating wire 18 is tightly fitted to the heat-conducting seat 17; the heating wire 18 heats the heat-conducting seat 17 and the heating ring 16 by electric heating to maintain the gas pipeline 2 at a higher temperature and further reduce the moisture content of the sampled gas.

[0023] Working Principle: For this type of simple gas sampling system for blast furnace top charging lines, the gas to be sampled is first output from the top gas outlet 1 through gas pipeline 2. When sampling is required, the second shut-off valve 4 is closed to stop the input of medium-pressure nitrogen. Then, the first shut-off valve 3 and the third shut-off valve 5 are kept open, while the second shut-off valve 4 and the fourth shut-off valve 7 are closed to release the gas and replace impurities in the pipeline. Since the gas venting end 6 can be set at the air circulation point in the gas and explosion hazard areas of the yard, it can effectively reduce the danger of sampling from the top of the blast furnace and prevent gas poisoning of sampling personnel. After two minutes of ventilation, the impurities in gas pipeline 2 are replaced. Then, the staff closes the third shut-off valve 5 and opens the fourth shut-off valve 7, the venting shut-off valve 8, and the sampling shut-off valve 10. The gas passes through the venting shut-off valve 8 and the sampling shut-off valve 10. 10. After a small amount of gas is released through the venting end 9, the staff takes a sample at the gas sampling end 11. After the sampling is completed, the fourth shut-off valve 7 needs to be closed in time, and the second shut-off valve 4 needs to be opened to backflush and clean the gas with medium-pressure nitrogen. The heating ring 16 fitted on the outer wall of the gas pipeline 2 heats or insulates the gas pipeline 2 through the heating wire 18 inserted in the heat-conducting seat 17, keeping the gas pipeline 2 at a high temperature level, thereby reducing the water vapor content in the sampled gas. Finally, the gas pipeline 2 reduces the adhesion of water vapor on the inner wall of the gas pipeline 2 through the insulation effect of the composite ceramic lining 12 and the rubber and plastic insulation sleeve 14, combined with the hydrophobic effect of the nano-ceramic coating 15, thereby improving the purity of the sampled gas. In addition, the metal shell 13 in the gas pipeline 2 can improve the structural strength of the gas pipeline 2 and extend its service life.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A simple gas sampling system for blast furnace charging line, characterized in that, include: A gas outlet (1) is located at the top of the furnace. A gas pipeline (2) is connected to the outlet of the gas outlet (1). A first shut-off valve (3) is installed at the end of the gas pipeline (2) closest to the gas outlet (1). A second shut-off valve (4) is connected to the end of the gas pipeline (2) closest to the first shut-off valve (3) via a tee. Medium-pressure nitrogen gas, which serves to backflush and prevent pipeline blockage, is connected to the end of the gas pipeline (2) furthest from the first shut-off valve (3) via a tee. A third shut-off valve (5) is connected to the other end of the third shut-off valve (5) via a gas outlet. The pipeline (2) is connected to a gas venting end (6). A fourth shut-off valve (7) is installed at one end of the gas pipeline (2) away from the gas output end (1) at the top of the furnace. The other end of the fourth shut-off valve (7) is connected to a venting shut-off valve (8) through the gas pipeline (2). The other end of the venting shut-off valve (8) is connected to a sampling venting end (9) through the gas pipeline (2). The inner sides of the fourth shut-off valve (7) and the venting shut-off valve (8) are connected to a sampling shut-off valve (10) through a tee and the gas pipeline (2). The other end of the sampling shut-off valve (10) is connected to a gas sampling end (11) through the gas pipeline (2).

2. The simplified blast furnace gas sampling system according to claim 1, characterized in that: The gas outlet (1) at the top of the furnace is connected to the gas vent (6) through the gas pipeline (2), the first shut-off valve (3) and the third shut-off valve (5), and the medium-pressure nitrogen is connected to the gas pipeline (2) through the second shut-off valve (4).

3. The simplified blast furnace gas sampling system according to claim 1, characterized in that: The gas output terminal (1) at the top of the furnace is connected to the gas sampling terminal (11) through the first shut-off valve (3), the fourth shut-off valve (7) and the sampling shut-off valve (10), and the gas output terminal (1) at the top of the furnace is connected to the discharge and release terminal (9) through the first shut-off valve (3), the fourth shut-off valve (7) and the release shut-off valve (8).

4. A simplified blast furnace gas sampling system according to claim 1, characterized in that: The first shut-off valve (3), the second shut-off valve (4), the third shut-off valve (5), the fourth shut-off valve (7), the vent shut-off valve (8), and the sampling shut-off valve (10) are all used for the opening and closing control of different passages of the gas pipeline (2).

5. A simplified blast furnace gas sampling system according to claim 1, characterized in that: The innermost layer of the gas pipeline (2) is provided with a composite ceramic liner (12), the outer wall of the composite ceramic liner (12) is covered with a metal pipe shell (13), the outer wall of the metal pipe shell (13) is fitted with a rubber and plastic insulation sleeve (14), and the inner wall of the composite ceramic liner (12) is coated with a nano ceramic coating (15).

6. A simplified blast furnace gas sampling system according to claim 5, characterized in that: The rubber-plastic insulation sleeve (14) forms an enclosing structure between the metal tube shell (13) and the composite ceramic liner (12), and the rubber-plastic insulation sleeve (14) and the metal tube shell (13) form a detachable structure.

7. A simplified blast furnace gas sampling system according to claim 5, characterized in that, The outer wall of the gas pipeline (2) is also fitted with a heating ring (16). A heat-conducting seat (17) is fixed on the upper outer wall of the heating ring (16). A heating wire (18) is passed through the inner side of the heat-conducting seat (17). The heating ring (16) is evenly distributed at equal intervals along the outer wall of the gas pipeline (2), and the heating wire (18) and the heat-conducting seat (17) are tightly fitted together.

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