Continuous casting secondary cooling water pressure regulation system

Abstract

This invention discloses a continuous casting secondary cooling water pressure regulation system, located in the continuous casting machine body area. It includes a main inlet pipe and a main outlet pipe. The inlet end of the main inlet pipe connects to a continuous casting water treatment station equipped with a water pump. A pressurization pipe and an atmospheric pressure pipe are connected in parallel between the main inlet and outlet pipes. The outlet end of the main outlet pipe connects to the inlet pipes of each casting stream. Pressure detection mechanisms are installed on the main inlet pipe, pressurization pipe, main outlet pipe, and the inlet pipes of each casting stream. The pressurization pipe is equipped with a pressurization pump, a regulating valve, and a check valve. The atmospheric pressure pipe is equipped with a regulating valve and a check valve. Each casting stream's inlet pipe is equipped with a pressure reducing valve, a regulating valve, and a shut-off valve. This system can meet any requirements for cooling methods of large and small cross-section billets of each casting stream, is adaptable to upgrades and modifications, and eliminates the impact of pressure loss.

Description

Technical Field

[0001] This invention belongs to the field of continuous casting in iron and steel metallurgy, and specifically relates to a continuous casting secondary cooling water pressure regulation system. Background Technology

[0002] Steel production processes are increasingly moving towards higher efficiency, and efficient continuous casting is key to achieving this. The core of efficient continuous casting is high casting speed. At high casting speeds, the volume of water used for secondary cooling of the billet is large. Using traditional secondary cooling water pressure (1.0–1.1 MPa) and nozzles leads to decreased cooling efficiency and uneven cooling of the billet. Furthermore, at high casting speeds, the solidified billet shell is thinner, and uneven cooling severely impacts billet quality. Therefore, at high casting speeds, it is necessary to pressurize the secondary cooling water (1.6–2.0 MPa) to improve its heat exchange efficiency.

[0003] In current continuous casting production practices, in order to save construction and operating costs and improve the efficiency of casting machines, a single continuous casting machine can produce a variety of billet specifications. For example, a multi-strand continuous casting machine may have several strands producing small square billets with cross-sections such as 165×165 at high casting speeds, while the remaining strands may produce large square billets with cross-sections such as 230×350.

[0004] High-pressure full-water cooling is required when producing small billets at high casting speeds, while atmospheric pressure air mist cooling is required when producing large billets. If two completely independent secondary cooling systems are used to meet the simultaneous production of large and small billets on a single continuous casting machine, the piping and electrical control of the secondary cooling water system will be more complex, and the footprint will be larger, resulting in a relatively higher investment. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous casting secondary cooling water pressure regulation system. One system can meet any requirements of the cooling method of large and small cross-section billets in various casting flows, can adapt to upgrades and modifications, and can eliminate the impact of pressure loss.

[0006] The technical solution adopted in this invention is:

[0007] A continuous casting secondary cooling water pressure regulation system is located in the continuous casting machine body area, including a main inlet pipe and a main outlet pipe. The inlet end of the main inlet pipe is connected to a continuous casting water treatment station equipped with a water pump. A pressurization pipe and an atmospheric pressure pipe are connected in parallel between the main inlet pipe and the main outlet pipe. The outlet end of the main outlet pipe is connected to the inlet pipes of each casting stream. Pressure detection mechanisms are provided on the main inlet pipe, the pressurization pipe, the main outlet pipe, and the inlet pipes of each casting stream. A pressurization water pump, a regulating valve, and a check valve are provided on the pressurization pipe. A regulating valve and a check valve are provided on the atmospheric pressure pipe. A pressure reducing valve, a regulating valve, and a shut-off valve are provided on the inlet pipes of each casting stream.

[0008] Furthermore, when all casting streams use high-pressure all-water to produce small billets, the pressurization pipeline is started and the atmospheric pressure pipeline is closed. The atmospheric pressure secondary cooling water from the continuous casting water treatment station is pressurized through the pressurization pipeline and then enters the inlet pipeline of each casting stream. The pressure reducing valves on the inlet pipelines of each casting stream are adjusted to ensure that the pressure of the secondary cooling water on the inlet pipeline of each casting stream is the same as the pressure after pressurization in the pressurization pipeline. When all casting streams use aerosol cooling to produce large billets, the atmospheric pressure pipeline is started and the pressurization pipeline is closed. The atmospheric pressure secondary cooling water from the continuous casting water treatment station enters the inlet pipeline of each casting stream, and the pressure of the secondary cooling water on the inlet pipeline of each casting stream is adjusted. The pressure reducing valves on the water pipelines ensure that the secondary cooling water pressure on the inlet pipelines of each casting stream is the same as the atmospheric pressure. When the production of large billets using aerosol cooling and the production of small billets using high-pressure all-water are carried out simultaneously, the pressurization pipeline is started and the atmospheric pressure pipeline is closed. After the atmospheric pressure secondary cooling water from the continuous casting water treatment station is pressurized through the pressurization pipeline, for the casting stream producing small billets, the pressure reducing valves on the corresponding inlet pipelines are adjusted to ensure that the secondary cooling water pressure on the corresponding inlet pipelines is not lost. For the casting stream producing large billets, the pressure reducing valves on the corresponding inlet pipelines are adjusted to adjust the secondary cooling water pressure on the corresponding inlet pipelines to atmospheric pressure.

[0009] Furthermore, two sets of pressurization pipelines are provided in parallel between the main inlet pipeline and the main outlet pipeline, with the two sets of pressurization pipelines serving as backups for each other.

[0010] Furthermore, the pressure detection mechanism includes a local pressure display instrument and a pressure signal transmitter.

[0011] Furthermore, both the inlet and outlet of the booster pump are connected to the booster pipeline via flexible connector compensators.

[0012] Furthermore, regulating valves are installed upstream and downstream of the pressurization pump on the pressurization pipeline.

[0013] The beneficial effects of this invention are:

[0014] The system employs parallel pressurized and atmospheric pressure pipelines, which can be switched between. When the cooling methods required for the sections produced by the continuous casting machine are the same, pressurization or depressurization is selected. When the cooling methods required for the sections produced by the continuous casting machine are different, the system can first pressurize the water by a pressurized water pump, and then reduce the pressure to atmospheric pressure through a pressure reducing valve in the inlet pipeline that needs depressurization. Therefore, a single system can flexibly accommodate sections with different cooling methods, and the production flow rates of each section can be arbitrarily combined. In short, it meets any requirements for the cooling methods of large and small section billets of various casting flows. The system pressurizes the water by a pressurized water pump on the pressurized pipeline, without requiring... To pressurize the water treatment plant, the water pumps can be selected according to conventional methods or remain unchanged, thus adapting well to the upgrading and renovation of old plants. The system can ensure no pressure loss by adjusting the pressure reducing valve, eliminating the impact of pressure loss of secondary cooling water in the pipeline from the water treatment plant to the continuous casting machine on continuous casting users. In this system, the pressure detection mechanism on the main inlet and outlet pipelines can detect pressure changes before and after passing through the pressurized or normal pressure pipelines, the check valve can prevent high-pressure water backflow from damaging components when the water supply is stopped, and the regulating valve can regulate the flow rate and open / close. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the continuous casting secondary cooling water pressure regulation system in an embodiment of the present invention.

[0016] In the diagram: 1-Main water inlet pipeline; 2-Pressure pipeline; 3-Normal pressure pipeline; 4-Main water outlet pipeline; 5-Water inlet pipeline; 6-Pressure signal transmitter; 7-Local pressure display instrument; 8-Regulating valve; 9-Flexible connector compensator; 10-Pressure pump; 11-Check valve; 12-Pressure reducing valve; 13-Shut-off valve. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] like Figure 1As shown, a continuous casting secondary cooling water pressure regulation system is installed in the continuous casting machine body area, including a main water inlet pipe 1 and a main water outlet pipe 4. The inlet end of the main water inlet pipe 1 is connected to a continuous casting water treatment station equipped with a water pump. A pressurization pipe 2 and an atmospheric pressure pipe 3 are connected in parallel between the main water inlet pipe 1 and the main water outlet pipe 4. The outlet end of the main water outlet pipe 4 is connected to the water inlet pipes 5 of each casting stream. Pressure detection mechanisms are provided on the main water inlet pipe 1, the pressurization pipe 2, the main water outlet pipe 4 and the water inlet pipes 5 of each casting stream. The pressurization pipe 2 is equipped with a pressurization water pump 10, a regulating valve 8 and a check valve 11. The atmospheric pressure pipe 3 is equipped with a regulating valve 8 and a check valve 11. The water inlet pipes 5 of each casting stream are equipped with a pressure reducing valve 12, a regulating valve 8 and a shut-off valve 13. The system employs parallel pressurized pipeline 2 and atmospheric pressure pipeline 3, which can be switched between. When the cooling methods required for the cross-sections produced by the continuous casting machine are the same, pressurization or non-pressurization is selected. When the cooling methods required for the cross-sections produced by the continuous casting machine are different, the system can first pressurize through pressurized water pump 10, and then reduce the pressure to atmospheric pressure through the pressure reducing valve 12 in the inlet pipeline 5, which requires pressure reduction. Therefore, one system can flexibly accommodate cross-sections with different cooling methods, and the production flow rate of each cross-section can be arbitrarily combined. In short, it meets any requirements for the cooling methods of large and small cross-section billets for each casting flow. The system pressurizes through pressurized water pump 10 on pressurized pipeline 2, and does not pressurize. The system requires pressurization within the continuous casting water treatment station. The water pumps in the continuous casting water treatment station can be selected conventionally or remain unchanged, thus adapting well to the upgrade and renovation of old plant areas. The system can ensure no pressure loss by adjusting the pressure reducing valve 12, eliminating the impact of pressure loss of secondary cooling water in the pipeline from the continuous casting water treatment station to the continuous casting machine body on continuous casting users. In this system, the pressure detection mechanisms on the main inlet pipeline 1 and the main outlet pipeline 4 can detect pressure changes before and after passing through the pressurization pipeline 2 or the normal pressure pipeline 3. The check valve 11 can prevent high-pressure water backflow from damaging components when water is stopped. The regulating valve 8 can regulate the flow rate and open / close.

[0019] When all casting streams use high-pressure all-water to produce small billets, start pressurization line 2 and close atmospheric pressure line 3. Atmospheric pressure secondary cooling water from the continuous casting water treatment station enters the inlet pipes 5 of each casting stream via pressurization line 2. Adjust the pressure reducing valves 12 on the inlet pipes 5 of each casting stream to make the secondary cooling water pressure on the inlet pipes 5 of each casting stream the same as the pressure after pressurization by pressurization line 2. When all casting streams use aerosol cooling to produce large billets, start atmospheric pressure line 3 and close pressurization line 2. Atmospheric pressure secondary cooling water from the continuous casting water treatment station enters the inlet pipes 5 of each casting stream. Adjust the pressure reducing valves 12 on the inlet pipes 5 of each casting stream to make the pressure of the secondary cooling water on the inlet pipes 5 of each casting stream the same as the pressure after pressurization by pressurization line 2. The pressure reducing valve 12 ensures that the secondary cooling water pressure on the inlet pipe 5 of each casting stream is the same as the atmospheric pressure. When the production of large billets using aerosol cooling and the production of small billets using high-pressure all-water are carried out simultaneously, the pressurization pipe 2 is started and the atmospheric pressure pipe 3 is closed. After the atmospheric pressure secondary cooling water of the continuous casting water treatment station is pressurized by the pressurization pipe 2, for the casting stream producing small billets, the pressure reducing valve 12 on the corresponding inlet pipe 5 is adjusted to ensure that the secondary cooling water pressure on the corresponding inlet pipe 5 is not lost. For the casting stream producing large billets, the pressure reducing valve 12 on the corresponding inlet pipe 5 is adjusted to adjust the secondary cooling water pressure on the corresponding inlet pipe 5 to the atmospheric pressure.

[0020] like Figure 1 As shown, in this embodiment, the pressurization pipeline 2 between the main water inlet pipeline 1 and the main water outlet pipeline 4 is provided with two sets connected in parallel, and the two sets of pressurization pipelines 2 serve as backups for each other; when the pressurization pump 10 or the pressurization pipeline 2 in use fails, the backup pressurization pipeline 2 is put into operation to ensure the continuity of subsequent production, and the faulty pressurization pipeline 2 can be repaired and replaced online without having to shut down the entire continuous casting machine for maintenance.

[0021] like Figure 1 As shown, in this embodiment, the pressure detection mechanism includes a local pressure display instrument 7 and a pressure signal transmitter 6; the local pressure display instrument 7 is used to measure and display the pressure value of the secondary cooling water locally, and the pressure signal transmitter 6 is used to remotely transmit the pressure signal value for easy remote monitoring by personnel.

[0022] like Figure 1 As shown, in this embodiment, the inlet and outlet of the booster pump 10 are both connected to the booster pipeline 2 through a flexible connector compensator 9. Since the booster pump 10 will cause certain vibrations to the connected pipeline during high-speed operation, the flexible connector compensator 9 is used to reduce the damage to the pipeline caused by the vibration, and also to facilitate the maintenance and disassembly of the booster pump 10.

[0023] like Figure 1 As shown, in this embodiment, regulating valves 8 are provided upstream and downstream of the pressurizing water pump 10 on the pressurizing pipeline 2; when the regulating valves 8 are closed, it is convenient to maintain and disassemble the pressurizing water pump 10.

[0024] In this embodiment, the regulating valve 8 can be a butterfly valve, gate valve, or other similar structure, and can be operated manually or electrically; the pressure reducing valve 12 can be operated manually or electrically.

[0025] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A continuous casting secondary cooling water pressure regulation system, characterized in that: Located in the continuous casting machine body area, it includes a main inlet water pipeline and a main outlet water pipeline. The inlet end of the main inlet water pipeline is connected to the continuous casting water treatment station equipped with a water pump. A pressurization pipeline and an atmospheric pressure pipeline are connected in parallel between the main inlet water pipeline and the main outlet water pipeline. The outlet end of the main outlet water pipeline is connected to the inlet water pipeline of each casting stream. Pressure detection mechanisms are provided on the main inlet water pipeline, the pressurization pipeline, the main outlet water pipeline and the inlet water pipeline of each casting stream. A pressurization water pump, a regulating valve and a check valve are provided on the pressurization pipeline. A regulating valve and a check valve are provided on the atmospheric pressure pipeline. A pressure reducing valve, a regulating valve and a shut-off valve are provided on the inlet water pipeline of each casting stream. When all casting streams use high-pressure all-water to produce small billets, the pressurization pipeline is started and the atmospheric pressure pipeline is closed. The atmospheric pressure secondary cooling water from the continuous casting water treatment plant is pressurized through the pressurization pipeline and then enters the inlet pipeline of each casting stream. The pressure reducing valves on the inlet pipelines of each casting stream are adjusted to ensure that the pressure of the secondary cooling water in the inlet pipeline of each casting stream is the same as the pressure after pressurization in the pressurization pipeline. When all casting streams use aerosol cooling to produce large billets, the atmospheric pressure pipeline is started and the pressurization pipeline is closed. The atmospheric pressure secondary cooling water from the continuous casting water treatment plant enters the inlet pipeline of each casting stream. The pressure of the inlet pipeline of each casting stream is adjusted. The pressure reducing valves ensure that the secondary cooling water pressure on the inlet pipes of each casting stream is the same as the atmospheric pressure. When the production of large billets using aerosol cooling and the production of small billets using high-pressure all-water are carried out simultaneously, the pressurization pipe is started and the atmospheric pressure pipe is closed. After the atmospheric pressure secondary cooling water from the continuous casting water treatment station is pressurized through the pressurization pipe, for the casting stream producing small billets, the pressure reducing valves on the corresponding inlet pipes are adjusted to ensure that the secondary cooling water pressure on the corresponding inlet pipes is not lost. For the casting stream producing large billets, the pressure reducing valves on the corresponding inlet pipes are adjusted to adjust the secondary cooling water pressure on the corresponding inlet pipes to atmospheric pressure.

2. The continuous casting secondary cooling water pressure regulating system as described in claim 1, characterized in that: Two sets of pressurization pipelines are connected in parallel between the main water inlet pipeline and the main water outlet pipeline, and the two sets of pressurization pipelines serve as backups for each other.

3. The continuous casting secondary cooling water pressure regulating system as described in claim 1, characterized in that: Pressure testing equipment includes local pressure display instruments and pressure signal transmitters.

4. The continuous casting secondary cooling water pressure regulating system as described in claim 1, characterized in that: The inlet and outlet of the booster pump are connected to the booster pipeline via flexible connectors.

5. The continuous casting secondary cooling water pressure regulating system as described in claim 1, characterized in that: In the pressurization pipeline, regulating valves are installed both upstream and downstream of the pressurization water pump.

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