Closed circulating cooling system for constant-pressure control of cooling waterway

Abstract

The utility model discloses a closed circulating cooling system for constant pressure control of a cooling waterway, which relates to the field of circulating water cooling systems and comprises a circulating pipeline, two ends of which are respectively connected with a water inlet and a water outlet of an electric furnace; a cooling device and a circulating water pump are arranged on the circulating pipeline; the electronic pressure gauge is arranged on the circulating pipeline between the cooling device and the circulating water pump and is used for detecting the pipeline pressure in front of the pump; the booster pump is connected to the circulating pipeline between the cooling device and the water inlet of the electric furnace and is used for pressurizing cooling water; the automatic pressure release valve is arranged on the circulating pipeline between the automatic exhaust valve and the cooling device; the PLC is connected with the electronic pressure gauge, the booster pump and the automatic pressure release valve; the pressure of the pipeline is monitored in time through the electronic pressure gauge and the PLC, and the booster pump, the emergency water tank, the automatic pressure release valve and the like are controlled to regulate and stabilize pressure when the pressure of the pipeline is abnormal, so that the pressure of the pipeline is maintained within a set pressure range, and stable operation of the cooling system and the cooling effect on the electric furnace are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of circulating water cooling systems, in particular to a closed-loop cooling system with constant pressure control of a cooling water circuit. Background Art

[0002] In the electric furnace smelting production of the rock wool industry, a large amount of heat is easily generated, which can damage the furnace body, causing furnace leakage or explosion, so the water cooling system of the electric furnace is indispensable. However, because the electric furnace body has a certain conductivity and the tap water is too hard and has too many impurities, it is easy to cause the cooling coil to be blocked. In addition, most electric furnace cooling systems are non-closed water circulation systems that use a circulating water pool as a medium container. The circulating medium is easily polluted by the external environment and then enters the pipeline to cause pipeline blockage.

[0003] During the operation of the circulating water pipeline, if the pipeline pressure exceeds the set pressure too much due to pipeline blockage, operating errors, etc., and exceeds the pressure resistance threshold of the equipment in the pipeline, it will affect the service life of the equipment and even damage the equipment, causing the system to fail to operate normally; when the pipeline pressure is lower than the set pressure due to pipeline leakage, etc., it will affect the cooling effect and cannot effectively cool the electric furnace; when the temperature of the electric furnace is too high and a large leak occurs, the pipeline pressure will drop rapidly, the cooling system will almost fail, and the electric furnace may explode.

[0004] Therefore, the existing electric furnace cooling system lacks effective control over the pipeline pressure, cannot guarantee the safety of the cooling system, and is difficult to achieve the expected cooling effect. Utility Model Content

[0005] In view of the deficiencies in the above-mentioned prior art, the utility model provides a closed-loop cooling system with constant pressure control of the cooling water circuit, which can avoid contamination of the circulating medium and at the same time realize constant pressure control of the pipeline, thereby achieving stable operation of the cooling system and improving the cooling effect on the electric furnace.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A closed-loop cooling system with constant pressure control of cooling water circuit, comprising

[0008] The two ends of the circulation pipeline are respectively connected to the water inlet and the water outlet of the electric furnace; the circulation pipeline is provided with a cooling device and a circulation water pump;

[0009] An electronic pressure gauge is installed on the circulation pipeline between the cooling device and the circulating water pump to detect the pressure of the pipeline before the pump;

[0010] A booster pump, connected to the circulation pipeline between the cooling device and the water inlet of the electric furnace, is used to pressurize the cooling water;

[0011] An automatic pressure relief valve, which is arranged on the circulation pipeline between the automatic exhaust valve and the cooling device, and is used to open and release pressure when the pipeline pressure is too high;

[0012] A PLC controller is connected with an electronic pressure gauge, a booster pump and an automatic pressure relief valve to control system pressure balance.

[0013] Preferably, it also includes a pressure sensor, wherein two pressure sensors are respectively arranged at the water inlet and the water outlet of the electric furnace to detect the pressure difference of the electric furnace and prevent the electric furnace from being blocked.

[0014] Preferably, it also includes an emergency water tank, one end of which is connected to an external water source, and the other end of which is connected to a circulation pipeline at the water inlet of the electric furnace.

[0015] Preferably, it also includes a water replenishment pump, which is arranged between the external water source and the emergency water tank to provide water replenishment power for the emergency water tank.

[0016] Preferably, the output end of the water replenishment pump is also connected between the cooling device and the circulating water pump, so that when the pressure in the electric furnace circulation pipeline drops too quickly, it can cooperate with the booster pump to perform emergency water replenishment; the water replenishment pump and the emergency water tank are connected to the PLC controller.

[0017] Preferably, it also includes an automatic exhaust valve, which is arranged on the circulation pipeline at the water outlet of the cable to ensure that the air in the pipeline is emptied when the system is operating normally to prevent air hammer.

[0018] Preferably, the cooling device adopts a closed cooling tower.

[0019] Preferably, the circulating water pump is arranged on the circulating pipeline between the cooling device and the water inlet of the electric furnace to provide circulating water power for the circulating pipeline.

[0020] Preferably, one end of the booster pump is connected to an external water source, and the other end is connected between the cooling device and the circulating water pump.

[0021] Preferably, it also includes a mechanical pressure gauge, which is arranged on the circulation pipeline between the circulating water pump and the water inlet of the electric furnace and is used to display the pressure behind the water pump to confirm whether the circulating water pump is operating normally.

[0022] By adopting the above technical solution, the beneficial effects of the utility model are as follows:

[0023] 1. In the utility model, the pipeline pressure is monitored in time by an electronic pressure gauge and a PLC controller, and when the pipeline pressure is abnormal, the booster pump, water supply pump, emergency water tank or automatic pressure relief valve are controlled to adjust and stabilize the pressure in time, so that the pipeline pressure is maintained within the set pressure range, ensuring the stable operation of the cooling system and the cooling effect on the electric furnace, and avoiding safety accidents caused by excessive temperature of the electric furnace.

[0024] 2. The closed circulation system of the utility model eliminates the open circulating water pool in the electric furnace cooling cycle, which can prevent foreign impurities, dust, etc. from entering the system and avoid pipeline blockage.

[0025] 3. Use the pressure sensor to detect the pressure difference between the water inlet and outlet of the electric furnace, monitor the blockage of the electric furnace in time, ensure that the cooling system cools down the electric furnace normally, and prevent the electric furnace from exploding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is a schematic diagram of the structure of the utility model.

[0028] In the figure: 1. Circulation pipeline; 2. Electric furnace; 21. Water inlet; 22. Water outlet; 3. Closed cooling tower; 4. Circulation water pump; 5. Electronic pressure gauge; 6. Booster pump; 7. Automatic pressure relief valve; 8. Automatic exhaust valve; 9. Emergency water tank; 10. Make-up water pump; 11. External water source; 12. PLC controller; 13. Mechanical pressure gauge. DETAILED DESCRIPTION

[0029] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0030] Embodiment 1

[0031] In a typical embodiment of the present application, a closed-loop cooling system with constant pressure control of a cooling water circuit is provided, such as Figure 1 Shown, including

[0032] The circulating pipeline 1 has two ends connected to the water inlet 21 and the water outlet 22 of the electric furnace 2 respectively; a cooling device and a circulating water pump 4 are arranged on the circulating pipeline;

[0033] The electronic pressure gauge 5 is arranged on the circulation pipeline between the cooling device and the circulating water pump, and is used to detect the pressure of the pipeline before the pump;

[0034] A booster pump 6, connected to the circulation pipeline between the cooling device and the water inlet of the electric furnace, is used to pressurize the cooling water;

[0035] Automatic pressure relief valve 7, which is arranged on the circulation pipeline between the automatic exhaust valve and the cooling device, is used to open and release the pressure when the pipeline pressure is too high, so as to protect the internal coil and other equipment of the cooling tower from exceeding the pressure threshold, and ensure the stable operation of the system;

[0036] The PLC controller 12 is connected with the electronic pressure gauge, the booster pump, the water supply pump and the automatic pressure relief valve to control the pressure balance of the system.

[0037] The cooling device cools the circulating water by heat exchange. In this embodiment, a closed cooling tower 3 is used. Of course, other existing cooling structures can also be used.

[0038] The circulating water pump provides circulating water power for the circulating pipeline, such as Figure 1 As shown, considering that the pressure at the water pump outlet is too high and the coil inside the cooling tower has limited pressure resistance, in order to extend the service life of the coil and ensure the safe operation of the system, in this embodiment, the circulating water pump 3 is arranged on the circulating pipeline between the closed cooling tower 3 and the electric furnace water inlet 21, so that the water output from the water pump directly enters the electric furnace, effectively cooling down while protecting the safe operation of the pipeline equipment.

[0039] The pressure on the circulation pipeline is detected in real time through an electronic pressure gauge and fed back to the PLC controller to monitor pipeline abnormalities. When the pipeline pressure is abnormal, the PLC controller controls the booster pump, water supply pump, emergency water tank or automatic pressure relief valve and other components to adjust the pressure accordingly. The PLC controller can use Siemens S7-200, S7-300, S7-1500, etc. In addition, pressure sensors are set at the water inlet and outlet of the electric furnace to detect the pressure difference between the two ends of the electric furnace. The pressure sensor is connected to the PLC controller to prevent the electric furnace from being blocked and causing abnormally high temperature.

[0040] The cooling system also includes an automatic exhaust valve 8 arranged on the circulation pipeline. When the system is filled with water and operating normally, the automatic exhaust valve is always open to exhaust air, ensuring that the air in the pipeline is emptied to prevent air hammer. Figure 1 As shown, the automatic exhaust valve 8 is installed at the highest point of the pipeline before the staged water use point, and automatic exhaust is performed during the operation of the cooling system.

[0041] A mechanical pressure gauge 13 is also provided between the circulating water pump and the water inlet of the electric furnace on the circulating pipeline to display the pressure behind the water pump to confirm whether the circulating water pump is operating normally.

[0042] When the electronic pressure gauge 5 feedbacks that the pipeline pressure is lower than the set pressure range due to pipeline leakage or other reasons, the PLC controller 12 controls the booster pump 6 to start, add water to the pipeline to increase the pressure, and prevent the electric furnace from being unable to cool down in time due to the reduction of system pressure. In order to improve the cooling effect of the circulating water circuit, the input end of the booster pump 6 is connected to the external water source 11, and the output end is connected between the closed cooling tower and the circulating water pump on the circulating pipeline, so as to pressurize the cooling water after passing through the closed cooling tower, which is conducive to improving the cooling efficiency.

[0043] When the electronic pressure gauge feedback pipeline pressure is higher than the set pressure range due to pipeline blockage, improper operation by workers, excessive water addition, etc., the PLC controller controls the opening of the automatic pressure relief valve 7 to drain and release pressure to ensure the balance of pipeline pressure in the system and protect the internal coils and other pipeline equipment to operate normally.

[0044] In addition, a water supply pump 10 is provided, one end of which is connected to an external water source 11, and the other end is connected to the circulation pipeline between the closed cooling tower and the circulating water pump. When the pressure in the pipeline drops too quickly, the booster pump 6 is cooperated to perform emergency water supply and pressure increase.

[0045] The cooling system is also provided with an emergency water tank 9, the output end of which is connected between the circulating water pump and the water inlet of the electric furnace. When the circulating water loss is insufficient during the operation of the system, the emergency water tank 9 replenishes the circulating water for the system to ensure the cooling effect. The other end of the emergency water tank 9 is connected to the water supply pump, and the external water source is connected to the water supply pump to supply water to the water tank. The external water source can be in the form of a pool, a reservoir, etc.

[0046] The working process of this embodiment is as follows:

[0047] When the system is operating normally, the booster pump, water supply pump and emergency water tank are all in the closed state. In the closed circulation pipeline 1 formed by the electric furnace 2, the closed cooling tower 3 and the circulating water pump 4, the circulating water pump provides the power for the circulation water operation. The circulating water is heated by the electric furnace 2 and then cooled by the closed cooling tower 3 to circulate and cool the electric furnace; at this time, the automatic exhaust valve 8 is opened, the automatic pressure relief valve 7 is closed, and the mechanical pressure gauge 13 and the electronic pressure gauge 5 are running and monitoring the pressure to be normal.

[0048] When the electronic pressure gauge 5 feedback pipeline pressure drops below the set pressure range due to daily loss, the PLC controller 12 controls the booster pump 6 to add water and increase the pressure; when the pressure drops rapidly and changes significantly due to a fault in the pipeline, the PLC controller 12 controls the booster pump 6 and the water supply pump 10 to start at the same time, and timely adjusts the system pressure back to a normal state; when the circulating pipeline is short of water due to a large leakage or other conditions in the pipeline, the emergency water tank 9 is controlled to be opened for emergency water supply and cooling;

[0049] When the electronic pressure gauge 5 feedbacks that the pipeline pressure is higher than the set pressure range due to pipeline blockage, improper operation by workers, excessive water addition, etc., the PLC controller 12 controls the opening of the automatic pressure relief valve 7 to drain water to ensure the balance of pipeline pressure in the system and protect the safe operation of the system.

[0050] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A closed-loop cooling system with constant pressure control of cooling water circuit, characterized in that: include The two ends of the circulation pipeline are respectively connected to the water inlet and the water outlet of the electric furnace; the circulation pipeline is provided with a cooling device and a circulation water pump; An electronic pressure gauge is installed on the circulation pipeline between the cooling device and the circulating water pump to detect the pressure of the pipeline before the pump; A booster pump, connected to the circulation pipeline between the cooling device and the water inlet of the electric furnace, is used to pressurize the cooling water; An automatic pressure relief valve, which is arranged on the circulation pipeline between the automatic exhaust valve and the cooling device, and is used to open and release pressure when the pipeline pressure is too high; A PLC controller is connected with an electronic pressure gauge, a booster pump, a water supply pump and an automatic pressure relief valve to control the pressure balance of the system.

2. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: It also includes an emergency water tank, one end of which is connected to an external water source, and the other end of which is connected to a circulation pipeline at the water inlet of the electric furnace.

3. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 2, characterized in that: It also includes a water replenishment pump, which is arranged between the external water source and the emergency water tank to provide water replenishment power for the emergency water tank.

4. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 3, characterized in that: The output end of the water supply pump is also connected between the cooling device and the circulating water pump to provide emergency water supply for the pipeline; the water supply pump and the emergency water tank are connected to the PLC controller.

5. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: It also includes an automatic exhaust valve, which is arranged on the circulation pipeline at the water outlet of the cable.

6. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: The cooling device adopts a closed cooling tower.

7. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: The circulating water pump is arranged on the circulating pipeline between the cooling device and the water inlet of the electric furnace.

8. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: One end of the booster pump is connected to an external water source, and the other end is connected between the cooling device and the circulating water pump.

9. A closed-loop cooling system with constant pressure control of cooling water circuit as claimed in claim 1, characterized in that: It also includes a pressure sensor, wherein the pressure sensor includes two and is respectively arranged at the water inlet and the water outlet of the electric furnace.

10. A closed-loop cooling system with constant pressure control of cooling water circuits as claimed in claim 1, characterized in that: It also includes a mechanical pressure gauge, which is arranged on the circulation pipeline between the circulation water pump and the water inlet of the electric furnace.

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