Blast furnace damping-down tuyere water energy-saving device and control method

Abstract

The blast furnace damping-down tuyere water energy-saving device comprises tuyere water supply bustle pipe sets, tuyere water supply bustle pipes are evenly arranged along a blast furnace body, and each tuyere water supply bustle pipe set comprises a water supply branch pipe, a water drainage branch pipe and an adjusting branch pipe; a waterway in each tuyere is connected with an external water supply system through a corresponding water supply branch pipe and a drainage branch pipe, one end of an adjusting branch pipe is connected with the water supply branch pipe, and the other end of the adjusting branch pipe is connected with the drainage branch pipe of the adjacent group of tuyere water supply bustle pipes. The device has the advantages that the adjusting branch pipes are additionally arranged, the fourth electric control valve is additionally arranged on each drainage branch pipe, the electric control valves are adopted, operators can manually adjust the opening degree of the valves on the HMI screen conveniently, manual valve opening on site is not needed, and the labor intensity of workers is reduced; an electric control valve is arranged at the output end of the regulating valve, an electric control valve is arranged at the input end of the regulating valve, when the valves are damaged, the electric control valve and the regulating valve 2 can be closed, the regulating valve can be replaced on line, and production is not affected.

Description

Technical Field

[0001] The invention relates to a blast furnace off-air tuyere water energy-saving device and a control method. Background Art

[0002] During the blast furnace smelting process, the tuyere is mainly used to supply air and spray coal into the blast furnace. Since the tuyere is in direct contact with the blast furnace, it is in a high temperature state for a long time and has a high heat load. Continuous cooling is required to maintain production. Currently, open circulating water systems are mostly used for cooling. The open circulating water system is also cyclically used for cooling. During operation, it is in direct contact with the atmosphere. The water volume, water quality and water temperature requirements are not very high. When the blast furnace is shut down, the heat load is reduced and the cooling intensity is reduced. Summary of the invention

[0003] The purpose of the present invention is to provide a blast furnace shut-down tuyere water energy-saving device and control method, which solves the problem of reduced heat load and decreased cooling intensity when the blast furnace is shut down.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A blast furnace off-air tuyere water energy-saving device comprises a tuyere water supply surrounding pipe group, the tuyere water supply surrounding pipes are evenly arranged along the blast furnace body, each group of tuyere water supply surrounding pipes comprises a water supply branch pipe, a drainage branch pipe, and a regulating branch pipe, the water channel inside each tuyere is connected to an external water supply system through a corresponding water supply branch pipe and a drainage branch pipe, one end of the regulating branch pipe is connected to the water supply branch pipe, and the other end of the regulating branch pipe is connected to the drainage branch pipe of an adjacent group of tuyere water supply surrounding pipes.

[0006] Each water supply branch includes an electrically controlled valve 1 and an electrically controlled valve 2 3 connected in series, each drainage branch includes an electrically controlled valve 3 4 and an electrically controlled valve 4 6 connected in series, each regulating branch includes a regulating valve 17, the output end of the electrically controlled valve 1 1 is connected to the input end of the regulating valve 17, and the output end of the electrically controlled valve 3 19 of the adjacent group of air outlet water supply pipes is connected to the output end of the regulating valve 17.

[0007] The external water supply system includes a circulating pump station, a water pool, security water, and an air vent drainage trough. The input end of the circulating pump station is connected to the output end of the water pool through a pipeline, the output end of the circulating pump station is connected to the water supply branch pipe, the input end of the water pool is connected to the output end of the air vent drainage trough through a pipeline, and the input end of the air vent drainage trough is connected to the drainage branch pipe.

[0008] The external water supply system also includes security water, which is connected to the water supply branch pipe through a pipeline.

[0009] The circulating pump station includes a circulating water pump.

[0010] Each regulating branch pipe includes an electric-controlled valve 2 and an electric-controlled valve 15. An electric-controlled valve 2 is provided between the output end of the electric-controlled valve 1 and the input end of the regulating valve 17. An electric-controlled valve 15 is provided between the output end of the electric-controlled valve 3 19 of the next group of air outlet water supply pipes and the output end of the regulating valve 17.

[0011] A blast furnace off-air tuyere water energy-saving control method, based on PLC / DCS, comprising:

[0012] S1. The water supply pressure range of each group of tuyere water supply pipes is 1.3~1.7mpa, and the water supply volume range of each group of tuyere water supply pipes is 33~37m 3 / h, the total water volume of the tuyere water supply pipe ranges from 1000 to 1060m 3 / h;

[0013] S2. When the blast furnace is shut down for maintenance, the heat load of the tuyere is reduced, the circulating water pump is stopped, and the safety water is used to supply water to maintain production. The supply pressure of the safety water is in the range of 0.3-0.7 MPa, and the total water volume of the tuyere water supply pipe is in the range of 33-37 m3 / h;

[0014] S3. During normal production, the electric control valve 1, electric control valve 2, electric control valve 3, electric control valve 3, electric control valve 4, and electric control valve 4, 6 of each group of tuyere water supply pipes are opened, and the electric control valve 2, electric control valve 15, and regulating valve 17 are closed;

[0015] S4, when the wind breaks, the electric control valve 1, the electric control valve 2, the electric control valve 3, the electric control valve 3, and the electric control valve 4, 6, remain in the open state, and the electric control valve 2, the electric control valve 15, and the regulating valve 17 are opened in sequence, and the water supply flow is adjusted by the regulating valve 17;

[0016] S4. When the wind break is over, first open the electric control valve 4 6 of the water supply pipe group of the odd-numbered air outlet and the electric control valve 1 1 of the water supply pipe group of the even-numbered air outlet, then close the electric control valve 2, electric control valve 15 and regulating valve 17 of the water supply pipe group of the air outlet, start the circulating water pump and resume production.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. Add regulating branches and add four electric control valves to each drainage branch. The electric control valves are used to facilitate operators to manually adjust the valve opening on the HMI human-machine interaction screen, without the need to manually open the valve on site, reducing labor intensity. When water outage or water supply operations need to be performed, the valves are used to control water;

[0019] 2. The output end of the regulating valve 17 is provided with an electric control valve 15, and the input end of the regulating valve 17 is provided with an electric control valve 2. When the valve 17 is damaged, the electric control valve 15 and the regulating valve 2 can be closed, and the regulating valve 17 can be replaced online without affecting production;

[0020] 3. When the air outlet is in the off state, the air outlet does not need strong cooling. The water supply of all air outlets is connected in series. Only the flow of one air outlet water supply pipe is consumed to meet the cooling needs of all air outlets.

[0021] 4. When a single branch pipe of the tuyere is blocked, the water flow direction can be opposite to that in energy-saving mode through the tuyere water pipe of the present invention. The water supply of the adjacent tuyere is connected to the drainage of the tuyere through valve control, and the water flow is poured to the water supply of the tuyere. Now the water supply of the tuyere is in a closed state. The water is drained by removing the soft connection of the water inlet of the tuyere to form a passage. The pipeline can be unblocked with high-pressure water. The water can also be drained through another passage of the three-way valve. The structure is simple and the operation is portable. It solves the problem of reduced heat load and decreased cooling intensity when the blast furnace is shut down. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of a blast furnace off-air tuyere water energy-saving device. DETAILED DESCRIPTION

[0023] The present invention is described in detail below in conjunction with the accompanying drawings, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0024] See Figure 1 A blast furnace wind-off tuyere water energy-saving device comprises a tuyere water supply surrounding pipe group, the tuyere water supply surrounding pipes are evenly arranged along the blast furnace body, each group of tuyere water supply surrounding pipes comprises a water supply branch pipe, a drainage branch pipe, and a regulating branch pipe, and the waterway inside each tuyere is connected to an external water supply system through corresponding water supply branch pipes and drainage branch pipes. The external water supply system comprises a circulating pump station, a water pool, safety water, a tuyere drainage trough, and safety water. The safety water is connected to the water supply branch pipe through a pipeline. The circulating pump station comprises a circulating water pump. The input end of the circulating water pump is connected to the output end of the water pool through a pipeline, the output end of the circulating water pump is connected to the water supply branch pipe, the input end of the water pool is connected to the output end of the tuyere drainage trough through a pipeline, and the input end of the tuyere drainage trough is connected to the drainage branch pipe.

[0025] One end of the regulating branch pipe is connected to the water supply branch pipe, and the other end of the regulating branch pipe is connected to the drainage branch pipe of the adjacent group of air outlet water supply pipes; each water supply branch includes an electrically controlled valve 1 and an electrically controlled valve 2 3 connected in series, and each drainage branch pipe includes an electrically controlled valve 3 4 and an electrically controlled valve 4 6 connected in series, and each regulating branch pipe includes a regulating valve 17, and the output end of the electrically controlled valve 1 is connected to the input end of the regulating valve 17, and the output end of the electrically controlled valve 3 19 of the adjacent group of air outlet water supply pipes is connected to the output end of the regulating valve 17; each regulating branch pipe includes an electrically controlled valve 2 and an electrically controlled valve 15, and an electrically controlled valve 2 is provided between the output end of the electrically controlled valve 1 and the input end of the regulating valve 17, and an electrically controlled valve 15 is provided between the output end of the electrically controlled valve 3 19 of the next group of air outlet water supply pipes and the output end of the regulating valve 17.

[0026] A blast furnace off-air tuyere water energy-saving control method, based on PLC / DCS, comprising:

[0027] S1. The water supply pressure of each group of tuyere water supply pipe is 1.6 MPa, and the water supply volume of each group of tuyere water supply pipe is 35 m3. 3 / h, the total water volume of the tuyere water supply pipe is 1050m 3 / h;

[0028] S2. When the blast furnace is shut down for maintenance, the heat load of the tuyere is reduced, the circulating water pump is stopped, and the safety water is used to supply water to maintain production. The supply pressure of the safety water is 0.5 MPa, and the total water volume of the tuyere water supply pipe is 35 m3 / h;

[0029] S3. During normal production, the electric control valve 1, electric control valve 2, electric control valve 3, electric control valve 3, electric control valve 4, and electric control valve 4, 6 of each group of tuyere water supply pipes are opened, and the electric control valve 2, electric control valve 15, and regulating valve 17 are closed;

[0030] S4, when the wind stop starts, the electric control valve 1, the electric control valve 2, the electric control valve 3, the electric control valve 4, and the electric control valve 4 6 remain in the open state, and the electric control valve 2, the electric control valve 15, and the regulating valve 17 are opened in sequence. The regulating valve 17 is a flow regulating valve with a switch scale of 0-100%. Referring to the outlet drainage temperature (generally around 35°C), the operator manually adjusts the switch degree of the regulating valve 17 through the 0-100% opening adjustment button on the HMI human-machine interaction screen to control the water flow and avoid waste;

[0031] S5. When the wind break is over, first open the electric control valve 4 6 of the water supply pipe group of the odd-numbered air outlet and the electric control valve 1 1 of the water supply pipe group of the even-numbered air outlet, then close the electric control valve 2, electric control valve 15 and regulating valve 17 of the water supply pipe group of the air outlet, start the circulating water pump and resume production.

[0032] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0033] [Example 1]

[0034] See Figure 1The blast furnace tuyere water supply pipe is arranged in a ring along the furnace body, and 30 tuyere water supply branches and drainage branches are evenly distributed. During normal production, the water supply pressure is 1.6 MPa, the water volume of each tuyere water supply pipe is 35 m3 / h, and the total water volume is 1050 m3 / h. In order to ensure safe and continuous production, the tuyere water system is equipped with security water. When the blast furnace is shut down for maintenance, the tuyere heat load is reduced, the tuyere water pump is stopped, and security water is used to supply water to maintain production. By installing pipes and valves, the water supply pressure is 0.5 MPa, and the total water volume of the tuyere water supply pipe is 35 m3 / h, which reduces energy consumption.

[0035] During normal production, 1#, 3#, 4#, 6#, 9#, 10#, 11#, 12# electric-controlled valves are opened, and 2#, 5#, 7#, 8#, 13# electric-controlled valves are closed; after the wind is stopped, the 1# air outlet water is used as the main water supply branch pipeline, and the 1#, 3#, 4#, 10#, 11# electric-controlled valves remain open, and the 5#, 8#, 7#, 13# electric-controlled valves are opened in turn, among which the 7# electric-controlled valve is a flow regulating valve to adjust the water supply flow; each air outlet water supply enclosure pipe is implemented according to this rule, after reaching the 30# air outlet, the 15#, 17#, 2# electric-controlled valves remain closed (to avoid water dispersion), the 14#, 18#, 19# electric-controlled valves remain open, and the 6#, 12# electric-controlled valves of the 1#-29# air outlets and the 9#, 16# electric-controlled valves of the 2#-30# air outlets are gradually closed, and the drainage water volume, water pressure and temperature of the 30# air outlet are observed.

[0036] When a single branch pipe of the air outlet is blocked, the water flow direction is opposite to that in energy-saving mode. Through valve control, the water supply of the adjacent air outlet is connected to the drainage of this air outlet, and the water flows up to the water supply of this air outlet. Now the water supply of this air outlet is in a closed state. Remove the soft connection of the water inlet from the air outlet to drain the water, form a passage, and use high-pressure water to dredge the pipeline. You can also drain the water through another passage of the three-way valve.

[0037] After the wind break is over, first open the 6# and 12# electric-controlled valves of the 1-29# air outlets, and the 9# and 16# electric-controlled valves of the 2#-30# air outlets, and then close the 5#, 7#, 8#, 2#, 17#, and 15# electric-controlled valves, observe the drainage water volume, water pressure, and temperature of each air outlet, and then start the air outlet water pump to resume normal production.

[0038] In order to reduce labor intensity and safety risks, the electronically controlled valve uses an electric valve and is operated next to the machine.

[0039] The present invention increases a regulating branch pipe and increases an electric-controlled valve 46 on each drainage branch pipe. The electric-controlled valve is used to facilitate operators to manually adjust the valve opening on the HMI human-machine interaction screen, without the need to manually open the valve on site, thereby reducing labor intensity. When it is necessary to perform water outage or water supply operations, the valve is used to control water. The output end of the regulating valve 17 is provided with an electric-controlled valve 15, and the input end of the regulating valve 17 is provided with an electric-controlled valve 2. When the valve 17 is damaged, the electric-controlled valve 15 and the regulating valve 2 can be closed, and the regulating valve 17 can be replaced online without affecting production. When in the wind-off state, the air outlet does not need strong cooling, and all air outlets are connected in series with water. The two tuyere water pipes are connected together, and only the flow of one tuyere water supply pipe is needed to meet the cooling needs of all tuyere water pipes; when a single tuyere pipe is blocked, the tuyere water pipe of the present invention can be used, and the water flow direction is opposite to that in energy-saving mode, and the water supply of the adjacent tuyere is connected to the drainage of the present tuyere through valve control, and the water flow is topped up to the water supply of the present tuyere. Now the water supply of the present tuyere is in a closed state, and the water inlet soft connection of the tuyere is removed to drain the water, forming a passage, and the pipeline is dredged with high-pressure water, and the water can also be drained through another passage of the three-way valve. The structure is simple, and the operation is portable, and the problem of reduced heat load and reduced cooling intensity when the blast furnace is shut down is solved.

Claims

1. A blast furnace off-air tuyere water energy-saving device, characterized in that: It includes a tuyere water supply surrounding pipe group, which is evenly arranged along the blast furnace body. Each group of tuyere water supply surrounding pipes includes a water supply branch pipe, a drainage branch pipe, and a regulating branch pipe. The water channel inside each tuyere is connected to the external water supply system through the corresponding water supply branch pipe and the drainage branch pipe. One end of the regulating branch pipe is connected to the water supply branch pipe, and the other end of the regulating branch pipe is connected to the drainage branch pipe of the adjacent group of tuyere water supply surrounding pipes.

2. A blast furnace off-air tuyere water energy-saving device according to claim 1, characterized in that: Each water supply branch comprises an electrically controlled valve 1 (1) and an electrically controlled valve 2 (3) connected in series, each drainage branch comprises an electrically controlled valve 3 (4) and an electrically controlled valve 4 (6) connected in series, each regulating branch comprises a regulating valve (17), the output end of the electrically controlled valve 1 (1) is connected to the input end of the regulating valve (17), and the output end of the electrically controlled valve 3 (19) of the adjacent group of air outlet water supply surrounding pipes is connected to the output end of the regulating valve (17).

3. A blast furnace off-air tuyere water energy-saving device according to claim 1, characterized in that: The external water supply system includes a circulating pump station, a water pool, security water, and a tuyere drainage trough. The input end of the circulating pump station is connected to the output end of the water pool through a pipeline, the output end of the circulating pump station is connected to the water supply branch pipe, the input end of the water pool is connected to the output end of the tuyere drainage trough through a pipeline, and the input end of the tuyere drainage trough is connected to the drainage branch pipe.

4. A blast furnace off-air tuyere water energy-saving device according to claim 1, characterized in that: The external water supply system also includes security water, which is connected to the water supply branch pipe through a pipeline.

5. The blast furnace off-air tuyere water energy-saving device according to claim 3 is characterized in that: The circulating pump station comprises a circulating water pump.

6. A blast furnace off-air tuyere water energy-saving device according to claim 2, characterized in that: Each regulating branch pipe comprises an electric control valve (2) and an electric control valve (15), wherein the electric control valve (2) is arranged between the output end of the electric control valve 1 (1) and the input end of the regulating valve (17), and the electric control valve (15) is arranged between the output end of the electric control valve 3 (19) of the next group of air outlet water supply surrounding pipes and the output end of the regulating valve (17).

7. The device according to any one of claims 1 to 6 implements a blast furnace off-air tuyere water energy-saving control method, characterized in that: Based on PLC / DCS implementation, including: S1. The water supply pressure range of each group of tuyere water supply pipes is 1.3~1.7mpa, and the water supply volume range of each group of tuyere water supply pipes is 33~37m 3 / h, the total water volume of the tuyere water supply pipe ranges from 1000 to 1060m 3 / h; S2. When the blast furnace is shut down for maintenance, the heat load of the tuyere is reduced, the circulating water pump is stopped, and the safety water is used to supply water to maintain production. The supply pressure of the safety water is in the range of 0.3-0.7 MPa, and the total water volume of the tuyere water supply pipe is in the range of 33-37 m3 / h; S3. During normal production, the electric control valves 1 (1), 2 (3), 3 (4) and 4 (6) of each group of tuyere water supply pipes are opened, and the electric control valves (2), (15) and regulating valves (17) are closed; S4, when the wind breaks, the electric control valve 1 (1), the electric control valve 2 (3), the electric control valve 3 (4), and the electric control valve 4 (6) remain in the open state, and the electric control valve (2), the electric control valve (15), and the regulating valve (17) are opened in sequence, and the water supply flow is adjusted by the regulating valve (17); S5. When the wind is shut down, first open the electric control valve 4 (6) of the water supply pipe group of the odd-numbered tuyere and the electric control valve 1 (1) of the water supply pipe group of the even-numbered tuyere, then close the electric control valve (2), electric control valve (15) and regulating valve (17) of the water supply pipe group of the tuyere, and start the circulating water pump to resume production.

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