A coal gas pipe network pressure regulating system

Abstract

The utility model relates to a kind of coal gas pipe network pressure regulating system, including blast furnace coal gas output system and blast furnace coal gas conveying system, the blast furnace coal gas output system includes blast furnace, bag-type dust collector and pressure regulating component, blast furnace's gas output end is communicated with the input end of bag-type dust collector, the pressure regulating component includes two sets of pressure regulating valve group, and the input end of two sets of pressure regulating valve group is communicated with the output end of bag-type dust collector in parallel;The blast furnace coal gas conveying system includes gas main pipe and multiple user units, and the output end of two sets of pressure regulating valve group is communicated with the one end of gas main pipe in parallel, and multiple user units are communicated with the other end of gas main pipe in parallel by user branch pipe respectively.The utility model optimizes system pressure regulating structure, effectively cope with the influence caused by special working condition to blast furnace coal gas conveying, ensure use stability.Effectively the rationalization of gas resource is utilized, improve resource utilization, reduce user use cost.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace gas pipeline technology, specifically to a gas pipeline pressure regulating system. Background Technology

[0002] The blast furnace-converter process in modern integrated iron and steel enterprises is a typical iron-coal chemical process, including sintering, pelletizing, coking, ironmaking, steelmaking, and rolling. Blast furnace gas, as a byproduct of blast furnace ironmaking, is characterized by large production volumes and numerous users, and is also an important secondary fuel energy source for iron and steel enterprises, accounting for approximately 30% of their energy consumption.

[0003] Currently, blast furnace gas is produced from polluting raw coal gas generated during blast furnace operations. After being purified by a dust removal device, clean blast furnace gas is obtained and then transported to downstream users through gas pipelines. Because the blast furnace gas has a high pressure, a pressure regulating device is usually installed between the dust removal device's output and the main gas transmission line of the gas pipeline to reduce the pressure and ensure pipeline stability and safety. However, most current pressure regulating devices use a single pressure regulating valve group, which cannot cope with special operating conditions (such as the impact of extreme weather or human intervention during maintenance), thus having significant limitations.

[0004] Furthermore, the existing gas pipeline system fails to rationally utilize gas resources. When gas consumption is low and there is a surplus, to prevent excessive pressure and pipeline damage, the excess gas is usually vented directly, resulting in a significant waste of gas resources. Conversely, when gas consumption is high and there is a shortage, the gas pressure delivered by the main gas pipeline decreases, and some downstream users often need to install booster pumps to regulate the blast furnace gas pressure and ensure stable gas supply. The continuous operation of these booster pumps consumes a large amount of electricity, further increasing the users' gas usage costs. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a gas pipeline pressure regulating system. The system optimizes the pressure regulating structure, effectively addresses the impact of special operating conditions on blast furnace gas transportation, and ensures operational stability. Furthermore, it effectively optimizes the utilization of gas resources, improves resource utilization efficiency, and reduces user operating costs.

[0006] This utility model is achieved through the following technical solution: a gas pipeline pressure regulating system, comprising a blast furnace gas production system and a blast furnace gas transmission system. The blast furnace gas production system includes a blast furnace, a bag filter, and a pressure regulating assembly. The gas output end of the blast furnace is connected to the input end of the bag filter. The pressure regulating assembly includes two sets of pressure regulating valve groups, the input ends of which are connected in parallel to the output end of the bag filter. The blast furnace gas transmission system includes a main gas transmission pipe and multiple user units. The output ends of the two sets of pressure regulating valve groups are connected in parallel to one end of the main gas transmission pipe. The multiple user units are connected in parallel to the other end of the main gas transmission pipe through user branch pipes. A total pressure gauge is installed on the main gas transmission pipe, and a butterfly valve, a flow regulating valve, a branch pressure gauge, and a safety shut-off valve are sequentially installed on the user branch pipes along the gas transmission direction.

[0007] This solution utilizes raw coal gas as a byproduct of blast furnace production. After purification by a baghouse dust collector, clean blast furnace gas is obtained. This gas is then depressurized by a pressure regulating assembly and transported along the main pipeline to various user units. The pressure regulating assembly includes two sets of pressure regulating valves connected in parallel between the baghouse dust collector and the main gas pipeline. One set is used for daily operation, while the other serves as a backup. This effectively addresses the impact of special operating conditions on blast furnace gas delivery. For example, if one set is under maintenance, pressure regulation can continue using the other set without requiring production shutdowns, ensuring stable system operation.

[0008] As an optimization, the blast furnace is connected to a bag filter via a first pipeline. The bag filter is connected in parallel to the input ends of two pressure regulating valve groups via a second pipeline. The output ends of the two pressure regulating valve groups are connected in parallel to one end of a third pipeline, the other end of which is connected to one end of the main gas supply pipe. A branch pressure gauge and a butterfly valve are installed on the second pipeline, and a butterfly valve is also installed on the third pipeline. This optimized scheme uses the branch pressure gauge on the second pipeline to monitor the initial blast furnace gas pressure, facilitating pressure regulation by the pressure regulating assembly. Furthermore, the second and third pipelines can be closed with butterfly valves, facilitating maintenance and repair of the intermediate pressure regulating assembly.

[0009] As an optimization, the number of blast furnace gas production systems is two, and the two systems are connected in parallel with the gas transmission main. The total pressure gauge is located at the rear end of both systems. This optimized scheme provides blast furnace gas through two systems, increasing the gas supply. Furthermore, the parallel operation of the two systems ensures independent operation and guarantees system stability.

[0010] As an optimization, a connecting pipeline is installed between the first pipeline of one blast furnace gas production system and the first pipeline of another blast furnace gas production system. A butterfly valve is installed on the connecting pipeline, and both first pipelines are equipped with a balancing valve and a butterfly valve. This optimized scheme connects the first pipelines of the two blast furnace gas production systems via the connecting pipeline, facilitating mutual exhaust. For example, when the bag filter of one system is under maintenance, the butterfly valve on the first pipeline of that system can be closed. By opening the butterfly valve on the connecting pipeline, the gas from that system can be introduced into the other system for purification using the bag filter of the other system, thus enabling the production of blast furnace gas. The balancing valve balances the pipeline pressure to prevent damage caused by sudden pressure increases.

[0011] As an optimization, the pressure regulating valve assembly includes a fourth pipeline, with its two ends connected to the second and third pipelines respectively. A butterfly valve, a pressure regulating valve, and a safety shut-off valve are sequentially installed on the fourth pipeline along the gas delivery direction. This optimized solution controls the opening and closing of the fourth pipeline through the butterfly valve, and adjusts and reduces the blast furnace gas pressure through the pressure regulating valve. When the system pressure is too high and cannot be adjusted and reduced in time, the safety shut-off valve promptly cuts off the pipeline, thereby preventing damage to the system due to overpressure. The entire pressure regulating valve assembly is safer and more stable in use.

[0012] As an optimization, a filter is also installed on the fourth pipeline, located between the butterfly valve and the pressure regulating valve on the fourth pipeline. This optimized solution uses a filter to further filter solid suspended matter in the blast furnace gas, improving cleanliness and preventing solid suspended matter from accumulating in the downstream pipeline.

[0013] As an optimization, a gas holder is also included. The input end of the gas holder is connected to the main gas pipe via a fifth pipeline, and the output end of the gas holder is connected to the main gas pipe via a sixth pipeline. The connection points of the fifth and sixth pipelines with the main gas pipe are located between the main pressure gauge and the user's branch pipe. A butterfly valve, a flow regulating valve, a check valve, and a branch pressure gauge are sequentially installed on both the fifth and sixth pipelines along the gas transmission direction. This optimized scheme allows surplus blast furnace gas to be stored in the gas holder when there is a gas surplus, avoiding waste. When the main gas pipe supply is insufficient, the stored surplus gas can be transported back to the main gas pipe for utilization, increasing the total gas transmission pressure of the main gas pipe, thereby ensuring the gas pressure of downstream users, ensuring stable gas transmission, effectively rationalizing the use of gas resources, improving resource utilization efficiency, and reducing user operating costs.

[0014] As an optimization, a butterfly valve is installed on the main gas transmission line between the fifth and sixth pipelines. In this optimized design, when the butterfly valve is closed, the connection between the main gas transmission line and the user branch line is severed, allowing the gas holder to be used as a buffer station, thus making the application more flexible.

[0015] As an optimization, a capacity meter is installed on the gas holder. This optimization facilitates the measurement of the blast furnace gas storage in the gas holder.

[0016] The beneficial effects of this utility model are as follows: 1. The blast furnace produces raw coal gas as a byproduct. After being purified by a bag filter, the raw coal gas becomes clean blast furnace gas. This blast furnace gas is then depressurized by a pressure regulating assembly and transported to various user units via the main conveying pipe. The pressure regulating assembly consists of two sets of pressure regulating valves connected in parallel between the bag filter and the main conveying pipe. One set is used for daily operation, while the other serves as a backup. This effectively addresses the impact of special operating conditions on blast furnace gas delivery. For example, if one set is under maintenance, the other set can continue to regulate the pressure without shutting down production, ensuring stable system operation.

[0017] 2. When there is a surplus of blast furnace gas, it can be stored in a gas holder to avoid waste. When the supply from the main gas pipe is insufficient, the stored surplus gas can be transported back to the main gas pipe for utilization, increasing the total gas transmission pressure of the main gas pipe, thereby ensuring the gas pressure of downstream users, ensuring stable gas transmission, and effectively and rationally utilizing gas resources to improve resource utilization efficiency. Therefore, users do not need to set up their own pressurization machines, greatly reducing user costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the process of this utility model; As shown in the figure: 1. Gas holder; 2. Blast furnace gas production system; 21. Blast furnace; 22. First pipeline; 23. Bag filter; 24. Second pipeline; 25. Pressure regulating assembly; 251. Pressure regulating valve group; 26. Fourth pipeline; 27. Third pipeline. 3. Main gas supply pipe; 4. Main pressure gauge; 5. User branch pipe; 6. Fifth pipeline; 7. Sixth pipeline; 8. Connecting pipeline; 9. Butterfly valve; 10. Branch pressure gauge; 11. Filter; 12. Pressure regulating valve; 13. Safety shut-off valve; 14. Flow regulating valve; 15. User unit; 16. Capacity meter; 17. Vent valve; 18. Check valve; 19. Balancing valve. Detailed Implementation

[0019] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0020] like Figure 1 As shown, a gas pipeline pressure regulating system includes a blast furnace gas production system 2 and a blast furnace gas transportation system. The blast furnace gas production system 2 includes a blast furnace 21, a bag filter 23, and a pressure regulating assembly 25. The pressure regulating assembly 25 includes two sets of pressure regulating valve groups 251.

[0021] The blast furnace gas transmission system includes a main gas transmission pipe 3 and multiple user units 15. The output ends of the two sets of pressure regulating valve groups 251 are connected in parallel to one end of the main gas transmission pipe 3, and the multiple user units 15 are connected in parallel to the other end of the main gas transmission pipe 3 through user branch pipes 5. A total pressure gauge 4 is installed on the main gas transmission pipe 3, and a butterfly valve 9, a flow regulating valve 14, a branch pressure gauge 10, and a safety shut-off valve 13 are installed sequentially along the gas transmission direction on the user branch pipes 5.

[0022] The blast furnace 21 is used to produce raw coal gas as a byproduct, and the bag filter 23 is used to remove dust and purify the raw coal gas into clean blast furnace gas. This is a conventional device in existing steel plants and will not be described in detail here. Raw coal gas is produced by the blast furnace 21, and after being purified by the bag filter 23, clean blast furnace gas is obtained. The blast furnace gas is then regulated and depressurized by the pressure regulating component 25 and transported to each user unit 15 along the main conveying pipe for use.

[0023] Specifically, the gas output end of the blast furnace 21 is connected to the input end of the bag filter 23. In this embodiment, the gas output end of the blast furnace 21 is connected to the input end of the bag filter 23 through a first pipeline 22. The input ends of two sets of pressure regulating valve groups 251 are connected in parallel to the output end of the bag filter 23. In this embodiment, the output end of the bag filter 23 is connected in parallel to the input ends of the two pressure regulating valve groups 251 through a second pipeline 24. The output ends of the two pressure regulating valve groups 251 are connected in parallel to one end of a third pipeline 27, and the other end of the third pipeline 27 is connected to one end of the main gas supply pipe 3. A branch pressure gauge 10 and a butterfly valve 9 are installed on the second pipeline 24, and a butterfly valve 9 is also installed on the third pipeline 27.

[0024] The branch pressure gauge 10 on the second pipeline 24 is used to monitor the initial blast furnace gas pressure, facilitating pressure regulation by the pressure regulating assembly 25. Furthermore, the second pipeline 24 and the third pipeline 27 can be closed via the butterfly valve 9, facilitating maintenance and repair of the intermediate pressure regulating assembly 25.

[0025] Specifically, the pressure regulating valve assembly 251 includes a fourth pipeline 26, with its two ends connected to the second pipeline 24 and the third pipeline 27, respectively. A butterfly valve 9, a pressure regulating valve 12, and a safety shut-off valve 13 are sequentially installed on the fourth pipeline 26 along the gas delivery direction. A filter 11 is also installed on the fourth pipeline 26, located between the butterfly valve 9 and the pressure regulating valve 12. The butterfly valve 9 controls the opening and closing of the fourth pipeline 26. The pressure regulating valve 12 is used to adjust and reduce the blast furnace gas pressure. The filter 11 further filters solid suspended matter in the blast furnace gas, improving cleanliness and preventing solid suspended matter from accumulating in the downstream pipeline. When the system pressure is too high and cannot be adjusted to reduce the pressure in time, the safety shut-off valve 13 is used to cut off the pipeline in time, thereby preventing damage to the system due to overpressure. The entire pressure regulating valve assembly 251 is safer and more stable in use. Preferably, in the gas pipeline pressure regulating system of this embodiment, there are two sets of blast furnace gas production systems 2, which are connected in parallel with the main gas transmission pipe 3. Specifically, the third pipeline 27 of the two sets of blast furnace gas production systems 2 is connected in parallel with the main gas transmission pipe 3. The total pressure gauge 4 is located at the rear end of the two sets of blast furnace gas production systems 2. By having the two sets of blast furnace gas production systems 2 simultaneously supply blast furnace gas to the main gas transmission pipe 3, the gas supply can be increased. Moreover, the parallel connection of the two sets of blast furnace gas production systems 2 does not affect each other, ensuring system stability. The total pressure gauge 4 is used to monitor the total pressure of the blast furnace gas output by the two sets of blast furnace gas production systems 2, which facilitates the calculation and allocation of gas volume to each user unit.

[0026] Preferably, a connecting pipe 8 connects the first pipeline 22 of one blast furnace gas production system 2 to the first pipeline 22 of the other blast furnace gas production system 2. A butterfly valve 9 is installed on the connecting pipe 8, and both first pipelines 22 are equipped with a balancing valve 19 and a butterfly valve 9. The balancing valve 19 is used to balance the pressure of the first pipeline 22 to prevent sudden pressure increases from damaging the pipeline. The connecting pipe 8 connects the first pipelines 22 of the two blast furnace gas production systems 2, facilitating mutual exhaust. For example, when the bag filter 23 of one system is under maintenance, the first pipeline 22 of that system can be closed, and the butterfly valve 9 of the connecting pipe 8 can be opened, allowing the gas from that system to be introduced into the other system for purification by the bag filter 23 of the other system, ensuring the production of blast furnace gas.

[0027] The gas pipeline pressure regulating system also includes a gas holder 1. The input end of the gas holder 1 is connected to the main gas pipe via the fifth pipe 6, and the output end of the gas holder 1 is connected to the main gas pipe via the sixth pipe 7. The connection points of the fifth pipe 6 and the sixth pipe 7 with the main gas pipe are located between the main pressure gauge 4 and the user branch pipe 5. A butterfly valve 9, a flow regulating valve 14, a check valve 18, and a branch pressure gauge 10 are sequentially installed on both the fifth pipe 6 and the sixth pipe 7 along the gas transmission direction.

[0028] The opening and closing of the pipeline is controlled by butterfly valve 9, and the one-way valve 18 prevents blast furnace gas backflow. Flow regulating valve 14 is used to control the flow rate of the delivered gas to ensure a stable and smooth flow direction. When there is a surplus of gas, it can be stored in gas holder 1 to avoid waste. When the supply from the main gas pipe is insufficient, the stored surplus gas can be transported back to the main gas pipe 3 for utilization, increasing the total gas transmission pressure of the main gas pipe, thereby ensuring the gas pressure of downstream users, ensuring stable gas transmission, effectively and rationally utilizing gas resources, and improving resource utilization rate. Therefore, compared with existing technologies, users no longer need to set up their own pressurization machines, thus greatly reducing user costs.

[0029] Preferably, a butterfly valve 9 is installed on the main gas supply pipe 3 between the fifth pipe 6 and the sixth pipe 7. When the butterfly valve 9 is closed, the connection between the main gas supply pipe 3 and the user branch pipe 5 is cut off. At this time, the blast furnace gas input from the main gas supply pipe can only flow to the gas holder 1, and then the blast furnace gas is supplied to each user unit 15 through the gas holder 1. At this time, the gas holder 1 can be used as a buffer station, making the application more flexible.

[0030] The gas holder 1 is equipped with a capacity meter 16 to facilitate the measurement of the blast furnace gas storage in the gas holder 1. The gas holder 1 is also equipped with a vent valve 17, which can release the gas when the pressure of the blast furnace gas stored in the gas holder 1 is too high, thus ensuring the stability and safety of the gas holder 1.

[0031] In this embodiment, the blast furnace gas delivery system has four user units 15, namely user unit A, user unit B, user unit C, and user unit D. The gas consumption of the four user units 15 decreases sequentially from A to D. User unit A is a thermal power plant, user unit B is a steel rolling mill, user unit C is a cold rolling workshop, and user unit D is an ultrafine powder workshop. Each user unit 15 controls the opening and closing of the pipeline through a butterfly valve 9 on the user branch pipe 5, and controls the gas flow rate delivered to the user unit 15 through a flow regulating valve 14, thereby regulating the gas delivery pressure of the user unit 15. The pressure value is monitored in real time by a branch pressure gauge 10. When the pipeline pressure is too high and cannot be regulated in time, the safety shut-off valve 13 is used to cut off the pipeline in time, thereby avoiding damage caused by overpressure and ensuring the gas safety of the user.

[0032] Working principle: Under normal use, butterfly valve 9 on connecting pipeline 8 is in the closed state, and the two sets of blast furnace gas production systems 2 operate independently to supply blast furnace gas to the gas transmission main 3. Butterfly valves 9 on the fifth pipeline 6 and the sixth pipeline 7 are in the closed state, while other valves are open. Blast furnace gas is delivered to each user unit 15 through the gas transmission main 3.

[0033] For example, when a user unit 15 stops using blast furnace gas, the pressure in the gas transmission main 3 increases, resulting in a surplus of gas production. At this time, the butterfly valve 9 of the fifth pipeline 6 can be opened to allow some gas to flow into the gas holder 1 for storage. Alternatively, when the usage of each user unit 15 increases, leading to insufficient gas supply in the gas transmission main 3, the butterfly valve 9 of the sixth pipeline 7 can be opened to transport the gas previously stored in the gas holder 1 to the gas transmission main 3 to supplement the gas pressure and achieve effective resource utilization.

[0034] Storing surplus blast furnace gas avoids waste. When the gas supply from the main gas pipe is insufficient, the surplus gas stored in gas holder 1 can be transported back to the main gas pipe 3 for utilization, increasing the total gas transmission pressure of the main gas pipe, thereby ensuring the gas pressure of downstream users, guaranteeing stable gas transmission, and effectively and rationally utilizing gas resources to improve resource utilization efficiency. Therefore, compared with existing technologies, users no longer need to set up their own pressurization machines, thus greatly reducing user operating costs.

[0035] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A gas pipeline pressure regulating system, comprising a blast furnace gas production system (2) and a blast furnace gas transmission system, characterized in that: The blast furnace gas production system (2) includes a blast furnace (21), a bag filter (23) and a pressure regulating assembly (25). The gas output end of the blast furnace (21) is connected to the input end of the bag filter (23). The pressure regulating assembly (25) includes two sets of pressure regulating valve groups (251). The input ends of the two sets of pressure regulating valve groups (251) are connected in parallel to the output end of the bag filter (23). The blast furnace gas transmission system includes a main gas transmission pipe (3) and multiple user units (15). The output ends of the two sets of pressure regulating valve groups (251) are connected in parallel with one end of the main gas transmission pipe (3). The multiple user units (15) are connected in parallel with the other end of the main gas transmission pipe (3) through user branch pipes (5). A total pressure gauge (4) is installed on the main gas transmission pipe (3). A butterfly valve (9), a flow regulating valve (14), a branch pressure gauge (10) and a safety shut-off valve (13) are installed in sequence along the gas transmission direction on the user branch pipe (5).

2. The gas pipeline pressure regulating system according to claim 1, characterized in that: The blast furnace (21) is connected to the bag filter (23) through the first pipeline (22). The bag filter (23) is connected in parallel to the input end of two pressure regulating valve groups (251) through the second pipeline (24). The output end of the two pressure regulating valve groups (251) is connected in parallel to one end of the third pipeline (27). The other end of the third pipeline (27) is connected to one end of the gas transmission main (3). A branch pressure gauge (10) and a butterfly valve (9) are installed on the second pipeline (24). A butterfly valve (9) is also installed on the third pipeline (27).

3. The gas pipeline pressure regulating system according to claim 2, characterized in that: The number of blast furnace gas production systems (2) is two, and the two blast furnace gas production systems (2) are connected in parallel with the gas transmission main pipe (3). The total pressure gauge (4) is located at the rear end of the two blast furnace gas production systems (2).

4. The gas pipeline pressure regulating system according to claim 3, characterized in that: A connecting pipe (8) is connected between the first pipeline (22) of one blast furnace gas production system (2) and the first pipeline (22) of another blast furnace gas production system (2). A butterfly valve (9) is installed on the connecting pipe (8), and a balancing valve (19) and a butterfly valve (9) are installed on both first pipelines (22).

5. The gas pipeline pressure regulating system according to any one of claims 1 to 4, characterized in that: The pressure regulating valve group (251) includes a fourth pipeline (26), the two ends of which are connected to the second pipeline (24) and the third pipeline (27) respectively. A butterfly valve (9), a pressure regulating valve (12) and a safety shut-off valve (13) are installed on the fourth pipeline (26) in sequence along the gas transmission direction.

6. The gas pipeline pressure regulating system according to claim 5, characterized in that: A filter (11) is also installed on the fourth pipeline (26), and the filter (11) is located between the butterfly valve (9) and the pressure regulating valve (12) on the fourth pipeline (26).

7. The gas pipeline pressure regulating system according to claim 1, characterized in that: It also includes a gas holder (1), the input end of which is connected to the main gas pipe through the fifth pipe (6), and the output end of which is connected to the main gas pipe through the sixth pipe (7). The connection point between the fifth pipe (6), the sixth pipe (7) and the main gas pipe is located between the main pressure gauge (4) and the user branch pipe (5). The fifth pipe (6) and the sixth pipe (7) are each equipped with a butterfly valve (9), a flow regulating valve (14), a check valve (18) and a branch pressure gauge (10) in sequence along the gas transmission direction.

8. The gas pipeline pressure regulating system according to claim 7, characterized in that: A butterfly valve (9) is installed on the main gas supply pipe (3) between the fifth pipe (6) and the sixth pipe (7).

9. The gas pipeline pressure regulating system according to claim 7, characterized in that: The gas holder (1) is equipped with a capacity meter (16).

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