Balancing device for pressures on two sides of inlet and outlet butterfly valves of circulating water pump of blast furnace

Abstract

The utility model discloses a balancing device for pressure on two sides of an inlet butterfly valve and an outlet butterfly valve of a blast furnace circulating water pump, which comprises a pressure balancing pipe, a front balancing valve and a rear balancing valve, a liquid inlet pipe of the blast furnace circulating water pump is connected with an upstream pipeline through the inlet butterfly valve, and a liquid outlet pipe of the blast furnace circulating water pump is connected with a downstream pipeline sequentially through a check valve and an outlet butterfly valve. One end of the pressure balance pipe is connected with a liquid inlet pipe of the blast furnace circulating water pump through the front balance valve, and the other end is connected with the upstream pipeline or the downstream pipeline through the rear balance valve. The pressure of the upstream pipeline or the downstream pipeline is introduced into the liquid inlet pipe and the liquid outlet pipe of the blast furnace circulating water pump through the pressure balance pipe, so that the pressure difference between the two sides of the inlet butterfly valve and the outlet butterfly valve is reduced or disappears, the inlet butterfly valve and the outlet butterfly valve can be quickly opened, and the overhauled blast furnace circulating water pump can be quickly put into use; therefore, the production stopping time can be reduced, and smooth production is guaranteed.

Description

Technical Field

[0001] This utility model relates to a device for balancing the pressure on both sides of the inlet butterfly valve of a blast furnace circulating water pump, belonging to the field of metallurgical equipment technology. Background Technology

[0002] Blast furnace smelting is a continuous production process that requires uninterrupted water supply from the blast furnace circulating water pumps. To prevent interruptions in the water supply, most blast furnace pump stations are equipped with backup pumps. If a blast furnace circulating water pump fails, the backup pump is immediately started and put back into the production system after maintenance is completed.

[0003] Figure 1 This is an installation diagram of the blast furnace circulating water pump and its inlet and outlet butterfly valves. The inlet pipe 3 of the blast furnace circulating water pump 4 is connected to the upstream pipeline 1 with higher pressure through the inlet butterfly valve 2. The outlet pipe 13 of the blast furnace circulating water pump 4 is connected to the downstream pipeline 10 with higher pressure through the check valve 5 and the outlet butterfly valve 12 in sequence. Before repairing the faulty blast furnace circulating water pump 4, the inlet butterfly valve 2 and the outlet butterfly valve 12 must be closed to release water and pressure from the blast furnace circulating water pump 4 before repair can be carried out. Because the pressure of the inlet pipe 3 and the outlet pipe 13 is low after the repair, while the pressure of the upstream pipeline 1 and the downstream pipeline 10 is high, the two butterfly valves are often difficult to open when the blast furnace circulating water pump 4 is put into operation due to the large pressure difference between the inlet butterfly valve 2 and the outlet butterfly valve 12. Taking the DN800 imported butterfly valve as an example, the pressure of the upstream pipeline 1 is 0.4 MPa. Five employees were unable to open it even with pipe wrenches. They could only wait for the blast furnace to be shut down and the system to be drained and depressurized before it could be opened. Only then could the blast furnace circulating water pump 4 be put into use. This not only affected the normal production process but also caused great inconvenience to the equipment maintenance work. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a pressure balancing device on both sides of the inlet and outlet butterfly valves of a blast furnace circulating water pump, enabling the blast furnace circulating water pump to be quickly put into use after maintenance and ensuring smooth production operation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pressure balancing device for the inlet and outlet butterfly valves of a blast furnace circulating water pump includes a pressure balancing pipe, a front balancing valve, and a rear balancing valve. The inlet pipe of the blast furnace circulating water pump is connected to an upstream pipeline through the inlet butterfly valve, and the outlet pipe of the blast furnace circulating water pump is connected to a downstream pipeline in sequence through a check valve and an outlet butterfly valve. One end of the pressure balancing pipe is connected to the inlet pipe of the blast furnace circulating water pump through the front balancing valve, and the other end is connected to an upstream or downstream pipeline through the rear balancing valve.

[0007] The pressure balancing device on both sides of the inlet and outlet butterfly valves of the blast furnace circulating water pump mentioned above also includes a drain pipe and a drain valve. One end of the drain pipe is connected to the middle of the pressure balancing pipe, and the drain valve is installed on the drain pipe.

[0008] The pressure balancing device on both sides of the inlet and outlet butterfly valves of the blast furnace circulating water pump mentioned above, the front balancing valve, the drain valve and the rear balancing valve are all manual gate valves, and their pressure ratings are greater than those of the inlet butterfly valve and the outlet butterfly valve.

[0009] The pressure balancing device on both sides of the inlet and outlet butterfly valves of the blast furnace circulating water pump mentioned above has a front balancing valve and a rear balancing valve with specifications of DN200-DN800, and a pressure balancing pipe with specifications of DN20-DN50.

[0010] This invention utilizes a pressure balancing pipe to introduce the pressure from the upstream or downstream pipeline into the inlet and outlet pipes of the blast furnace circulating water pump, thereby reducing or eliminating the pressure difference between the inlet and outlet butterfly valves. This allows the inlet and outlet butterfly valves to open quickly, enabling the blast furnace circulating water pump to be put into use quickly after maintenance. This reduces downtime and ensures smooth production. Attached Figure Description

[0011] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0012] Figure 1 This is a schematic diagram of the installation of the blast furnace circulating water pump with the inlet and outlet butterfly valves;

[0013] Figure 2 This is an installation diagram of this utility model.

[0014] The following are the labels in the diagram: 1. Upstream pipe, 2. Inlet butterfly valve, 3. Liquid inlet pipe, 4. Blast furnace circulating water pump, 5. Check valve, 6. Front balancing valve, 7. Pressure balancing pipe, 8. Drain valve, 9. Rear balancing valve, 10. Downstream pipe, 11. Drain pipe, 12. Outlet butterfly valve, 13. Liquid outlet pipe, 14. Standby water pump. Detailed Implementation

[0015] This utility model addresses the problem of difficulty in opening the inlet and outlet butterfly valves of a blast furnace circulating water pump after maintenance. It provides a pressure balancing device on both sides of the inlet and outlet butterfly valves of the blast furnace circulating water pump. This device can eliminate the pressure difference between the inlet and outlet butterfly valves, enabling them to open quickly. This allows the blast furnace circulating water pump to be put into use quickly after maintenance, reducing downtime and ensuring smooth production.

[0016] See Figure 1This utility model mainly includes a pressure balancing pipe 7, a front balancing valve 6, a drain valve 8, a rear balancing valve 9, and a drain pipe 11. One end of the pressure balancing pipe 7 is connected to the inlet pipe 3 of the blast furnace circulating water pump 4 through the front balancing valve 6, and the other end is connected to the upstream pipe 1 or the downstream pipe 10 through the rear balancing valve 9 (the figure shows the connection to the downstream pipe 10). Balancing valves are installed at both ends of the pressure balancing pipe 7 to facilitate pressure control. One end of the drain pipe 11 is connected to the middle of the pressure balancing pipe 7, and the drain valve 8 is installed on the drain pipe 11 to discharge the liquid in the pressure balancing pipe 7.

[0017] The front balancing valve 6, the drain valve 8, and the rear balancing valve 9 are all manual gate valves, and the pressure rating of the manual gate valves is greater than that of the inlet butterfly valve 2 and the outlet butterfly valve 12.

[0018] This invention can balance the pressure of the inlet and outlet butterfly valves of the blast furnace circulating water pump 4 after maintenance, thereby achieving the purpose of quickly opening the butterfly valves and quickly starting the blast furnace circulating water pump 4.

[0019] After this utility model is put into use, the blast furnace circulating water pump 4 can be put into operation without stopping production after maintenance, thereby improving equipment maintenance efficiency and ensuring smooth production.

[0020] The usage process of this utility model is as follows:

[0021] After the blast furnace circulating water pump is overhauled, the inlet butterfly valve 2 and outlet butterfly valve 12 are closed, making them difficult to open due to the large pressure difference between them. The pressure difference is even greater on the inlet butterfly valve 2, making it even harder to open. To put the blast furnace circulating water pump into operation, first fully open the front balancing valve 6, then slowly open the rear balancing valve 9 while observing the pressure on both sides of the inlet butterfly valve 2. When the pressure on both sides of the inlet butterfly valve 2 reaches a level that is equal or nearly equal, close the rear balancing valve 9. At this point, the inlet butterfly valve 2 and outlet butterfly valve 12 can be easily opened. After opening the inlet butterfly valve 2 and outlet butterfly valve 12, close the front balancing valve 6. With both the front balancing valve 6 and the rear balancing valve 9 closed, the blast furnace circulating water pump 4 can be successfully started and put into production.

[0022] To prevent stagnant water from remaining in the pressure balance pipe 7 for an extended period, the drain valve 8 needs to be opened to discharge the stagnant water through the drain pipe 11.

[0023] The pressure balancing pipe 7, the front balancing valve 6, and the rear balancing valve 9 are selected according to the needs. The size of the balancing valve is between DN200 and DN800, and the pressure balancing pipe 7 can be selected between DN20 and DN50.

[0024] This utility model has been successfully implemented at the No. 2 blast furnace pump station in the water supply operation area of ​​Handan Iron and Steel New District Energy and Power Plant. The No. 2 blast furnace pump station is mainly used in the furnace body soft water system. The inlet valve of the furnace body soft water system is DN800, and the outlet check valve and butterfly valve are both DN600. Through calculation and field experiments, a DN50 pressure balancing pipe 7 and a DN50 balancing valve were used. The drain pipe and drain valve 8 are DN20.

[0025] After the blast furnace pump station in the water supply operation area adopted this utility model, if any problem occurred with the blast furnace circulating water pump under various operating conditions, the backup water pump could be started directly for maintenance. Moreover, the equipment maintenance efficiency was significantly improved, the maintenance cycle was shortened, and the equipment could be easily put back into use without stopping production after maintenance was completed. This greatly reduced the equipment maintenance cycle and ensured the stability of blast furnace production.

[0026] This utility model has a simple structure, low cost, and is easy to install and use, effectively solving the problem of difficulty in putting into operation after water pump maintenance.

Claims

1. A pressure balancing device on both sides of the inlet and outlet butterfly valves of a blast furnace circulating water pump, characterized in that, The pressure balance pipe (7), the front balance valve (6) and the rear balance valve (9) are included, the inlet pipe (3) of the blast furnace circulating water pump (4) is connected with the upstream pipeline (1) through the inlet butterfly valve (2), the outlet pipe (13) of the blast furnace circulating water pump (4) is connected with the downstream pipeline (10) through the check valve (5) and the outlet butterfly valve (12) in sequence, one end of the pressure balance pipe (7) is connected with the inlet pipe (3) of the blast furnace circulating water pump (4) through the front balance valve (6), and the other end is connected with the upstream pipeline (1) or the downstream pipeline (10) through the rear balance valve (9).

2. The balance device for pressure on both sides of the inlet and outlet butterfly valve of blast furnace circulating water pump according to claim 1, characterized in that, The drain pipe (11) and the drain valve (8) are further included, one end of the drain pipe (11) is connected with the middle part of the pressure balance pipe (7), and the drain valve (8) is installed on the drain pipe (11).

3. The balancing device for the pressure on both sides of the inlet and outlet butterfly valve of a blast furnace circulating water pump according to claim 2, characterized in that, The front balance valve (6), the drain valve (8) and the rear balance valve (9) are all manual gate valves, and the pressure grades of the front balance valve (6), the drain valve (8) and the rear balance valve (9) are greater than those of the inlet butterfly valve (2) and the outlet butterfly valve (12).

4. The balance device for pressure on both sides of the inlet and outlet butterfly valve of blast furnace circulating water pump according to claim 3, characterized in that, The specifications of the front balance valve (6) and the rear balance valve (9) are DN200-DN800, and the specification of the pressure balance pipe (7) is DN20-DN50.

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