Intermediate frequency furnace cooling water circulation method capable of preventing blockage and dissipating heat efficiently

Abstract

The invention discloses an anti-blocking efficient heat dissipation intermediate frequency furnace cooling water circulation method which comprises the steps that water in a water tank flows into a full-automatic water softening device to be softened, calcium and magnesium ions in the water are removed, the water is cooled through a spray tower, then enters an intermediate frequency furnace through a main pipeline, is changed into hot water after cold and heat exchange and flows out, and the hot water enters a water return main pipeline; and hot water directly returns to the water tank through the water return main pipeline and is circulated again. According to the invention, no extra equipment is added, and the spray tower is arranged in front of the intermediate frequency furnace, so that the problems of small water inlet / outlet pressure difference, large water return resistance and slow backflow speed of the intermediate frequency furnace system are effectively solved, and the accidents of burning out and burnthrough of the intermediate frequency furnace pipeline caused by local overheating and overflowing due to slow cooling water flow rate and pipeline blockage by dirt of the intermediate frequency furnace are avoided; or the cooling efficiency is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment cooling. Specifically, it is a kind of anti-blocking high-efficiency heat dissipation medium frequency furnace cooling water circulation method. BACKGROUND

[0002] As the core heating equipment in the fields of metallurgy, casting, etc., the medium frequency furnace generates a large amount of heat during operation, which needs to rely on the cooling water circulation system to realize continuous cooling to ensure stable operation of the equipment and production safety. At present, the existing medium frequency furnace cooling water circulation system generally has the problems of poor descaling effect and rapid cooling efficiency decay in actual application, which frequently causes equipment pipeline blockage, local overheating and even damage, seriously interferes with the normal production process, and causes significant economic loss and safety hazard.

[0003] The cooling process of the existing medium frequency furnace is generally as follows: the water in the water storage tank is pumped by the water pump through the main pipeline (70 iron pipe) into the medium frequency furnace head and control cabinet, the cooling water in the fine copper pipe in the equipment is discharged after heat exchange and circulation, and then enters the drainage main pipeline, the hot water in the drainage main pipeline enters the spray tower for cooling and then enters the water storage tank, forming a closed loop; the disadvantage of this system is that the return water in the medium frequency furnace and the control cabinet is between the spray tower and the heat exchanger, which is also a fine copper pipe, which can cause the pressure of the return water in this section to be blocked, the water flow rate to be reduced, and the scale and rust in the medium frequency furnace head and the control cabinet to be unable to be quickly discharged, forming blockage in the fine copper pipe, affecting equipment heat dissipation, and causing equipment failure and damage. The core reason for the above problems lies in the defects in the system design and installation stage, such as:

[0004] 1. Unreasonable selection of pipeline material, easy to cause rust and scale: the existing system mostly uses iron pipeline as the cooling water conveying carrier. Iron pipeline is in contact with cooling water for a long time, which is easy to cause electrochemical corrosion and generate rust, and calcium and magnesium ions in the cooling water are easy to precipitate and form scale during temperature change. Rust and scale gradually deposit on the inner wall of the pipeline, not only reducing the flow cross section, but also reducing the heat conduction efficiency of the pipeline, directly affecting the cooling effect.

[0005] 2. Unscientific structure design of water circulation system, insufficient return water flow rate: in the design of the existing system, the medium frequency furnace and the cooling equipment (such as spray tower, cooler, etc.) are simply connected in series, and the hydraulic characteristics of the water circulation process are not optimized. This kind of extensive design leads to excessive resistance of the return water pipeline, and the pressure difference between the inlet and outlet of the system is too small, so that the flow rate of the cooling water is much lower than the critical blowdown flow rate. Insufficient flow rate causes the rust and scale generated in the pipeline to be unable to be effectively carried out by the water flow, further increasing the risk of pipeline blockage.

[0006] 3. Frequent overheating and overcurrent malfunctions in the equipment stem from the combined effects of the aforementioned dual defects: corrosion and scaling in the pipes, coupled with insufficient flow rate, create a vicious cycle. Pipe blockage reduces flow capacity and further slows the flow rate, leading to increased impurity deposition. This impurity deposition, in turn, exacerbates localized pipe resistance, reducing the heat exchange efficiency between the cooling medium and the equipment. Ultimately, this results in the inability of critical components such as the furnace body and control cabinet to dissipate heat in a timely manner, causing localized overheating, triggering overcurrent protection mechanisms, and even damaging core components, severely impacting production continuity and equipment lifespan. Therefore, an optimized solution is urgently needed to address these defects at their root, resolving issues such as high return water pressure and slow return speed in the intermediate frequency furnace; corrosion buildup and blockage of cooling water pipes; and localized overheating and overcurrent in the heating equipment caused by blockages in the cooling water pipes, leading to pipe burnout and equipment failure. Summary of the Invention

[0007] Therefore, the technical problem to be solved by the present invention is to provide a method for circulating cooling water in a medium-frequency furnace that prevents blockage and provides efficient heat dissipation. This method can effectively solve the problem of local overheating and overflow caused by blockage of cooling water pipes in medium-frequency furnaces, which can lead to pipe burnout or reduced cooling efficiency.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] A method for circulating cooling water in a medium-frequency furnace to prevent clogging and achieve efficient heat dissipation includes the following steps:

[0010] S1. Softening: Water flows into the water tank into the fully automatic water softening device, where it is softened to remove calcium and magnesium ions.

[0011] S2, Cooling: The water from the fully automatic water softening device is pumped into the spray tower by a water pump. Under high pressure, it forms fine atomized water droplets, which increases the gas-liquid contact area and quickly reduces the water temperature.

[0012] S3, Cooling and Recirculation: The water from the spray tower enters the medium-frequency furnace through the main pipeline. After heat exchange, it becomes hot water and flows out into the return water main pipeline. The hot water returns directly to the water tank through the return water main pipeline and re-enters the circulation.

[0013] Preferably, the bottom of the water tank is provided with a grid, the grid has an inclination angle of 60° to 80° and a mesh size of 100-300. The water return port of the water tank is located on the water tank above the grid, and the water outlet is located on the water tank below the grid.

[0014] Preferably, both the main water pipe and the return water main pipe are 90mm pipes.

[0015] Preferably, both the main water pipe and the return water main pipe are made of PP plastic.

[0016] Preferably, the above-mentioned water pump is a high-pressure pump.

[0017] The technical solution of the present invention achieves the following beneficial technical effects:

[0018] 1. This invention optimizes the water circulation system process design by placing the spray tower before the intermediate frequency furnace and increasing the diameter of the main pipeline and the return water main pipeline. This effectively improves the pressure difference between the system's inlet and outlet water, increases the main return water flow rate, and significantly reduces the pressure in the return water pipeline. Rust, dirt, gas, etc., inside the equipment can be flushed out, resulting in a significant improvement in cooling effect. This avoids the occurrence of equipment overheating alarms, solves the problem of high return water pressure and slow return flow rate in the intermediate frequency furnace, and ensures efficient circulation of cooling water in the pipeline, providing a stable medium transport foundation for equipment heat dissipation.

[0019] 2. This invention uses corrosion-resistant pipe materials to replace traditional iron pipes, reducing rust caused by electrochemical corrosion at the source. Secondly, the matching water purification components can reduce the hardness and impurity content of cooling water, inhibit scale formation, and combined with the increased return water flow rate, can promptly carry away trace amounts of rust, scale, and other impurities generated in the pipes, preventing them from depositing on the inner wall of the pipes and in the equipment cooling chamber. This completely solves the blockage problem caused by rust accumulation in existing systems, and avoids the problem of local overheating and overflow caused by blockage of cooling water pipes in medium frequency furnaces, which can lead to pipe burnout or reduced cooling efficiency.

[0020] 3. This invention greatly saves maintenance costs. Before the rectification, there were 1-2 repairs per year due to malfunctions, and the average cost of outsourcing maintenance was 6,000-8,000 yuan per year. After the rectification, there have been no such malfunctions for 2 years. It has a wide range of applications and can be used in various water circulation cooling equipment, reducing maintenance costs, reducing equipment failure rate, and improving production efficiency for enterprises.

[0021] 4. This invention innovatively changes only the system connection sequence, and scientifically designs and lays out the existing components without adding extra equipment or costs. It effectively solves the defects of the existing technology, meets production needs, and solves the problem of cooling water pipe blockage in medium frequency furnaces, resulting in significant social and economic benefits. Attached Figure Description

[0022] Figure 1 This is a structural block diagram of the present invention;

[0023] The reference numerals in the diagram are: 1-water tank; 2-fully automatic water softening device; 3-water pump; 4-spray tower; 5-medium frequency furnace. Detailed Implementation

[0024] like Figure 1As shown, the outlet of water tank 1 is connected to the inlet of fully automatic water softening device 2 (a commercially available product) via a pipe. The water from the fully automatic water softening device 2 is pumped into spray tower 4 via water pump 3. The outlet of spray tower 4 is connected to the cooling water inlet of medium frequency furnace 5 via a main pipe. The cooling water outlet of medium frequency furnace 5 is connected to the return water inlet of water tank 1 via a return water main pipe, thus forming a circulation system.

[0025] This invention discloses a method for circulating cooling water in a medium-frequency furnace to prevent clogging and achieve efficient heat dissipation, comprising the following steps:

[0026] S1. Softening: Water from water tank 1 flows into the fully automatic water softening device 2. The fully automatic water softening device 2 is a device that removes calcium and magnesium ions from water through sodium cation exchange resin, which can prevent scale formation and extend the equipment life. The softened water enters the cooling pipe of the medium frequency furnace 5, which can prevent scale formation and avoid clogging the pipe.

[0027] S2, Cooling: The water from the fully automatic water softening device 2 is pumped into the spray tower 4 by the water pump 3, and fine atomized water droplets are formed under high pressure to increase the gas-liquid contact area and quickly reduce the water temperature.

[0028] S3, Cooling and Recirculation: Water from spray tower 4 enters the medium-frequency furnace 5 and its control cabinet through the main pipeline. At this time, the pipeline pressure is very high, reaching 4 MPa. After heat exchange, the cooling water becomes hot water and flows out, entering the return water main pipeline. The hot water returns directly to the water tank 1 through the return water main pipeline. During this stage, due to the increased size of the return water main pipeline and the lack of resistance in the recirculation, the return water pressure will be very low, only about 0.5 MPa (the original return water pressure is 2.5 MPa). This results in a relatively large pressure difference between the inlet and outlet water, and the water flow speed will also increase. During this process, rust and water stains formed in the pipeline of the medium-frequency furnace 5 and its control cabinet will be flushed out. Then, after being filtered by the screen in the water tank 1, it enters the system circulation. When there is a lot of sediment on the screen, the screen can be removed and cleaned. The hot water entering the water tank 1 passes through the fully automatic water softening device 3 and spray tower 4 for cooling in sequence, and then enters the medium-frequency furnace 5 and its control cabinet again, forming a closed-loop water circulation process.

[0029] In this embodiment, a grid (not shown in the figure) is provided at the bottom of the water tank 1. The grid has an inclination angle of 60° to 80° and a mesh size of 100-300. The return water inlet of the water tank 1 is located on the water tank 1 above the grid, and the outlet water is located on the water tank 1 below the grid. The cooling water of the medium frequency furnace 5 enters the water tank 1 through the return water inlet at the top of the water tank 1. The grid filters out impurities such as sediment and rust flushed out during system operation. The water then enters the fully automatic water softening device 2 through the outlet water at the bottom of the water tank 1 for circulating cooling. The water filtered by the grid avoids impurities from continuously circulating in the circulation system and causing blockage.

[0030] In this embodiment, both the main pipe and the return water main pipe are 90mm pipes and are made of PP plastic. By changing the material from iron pipes to PP plastic, the formation of rust in the entire system is reduced. Increasing the pipe diameter increases the flow rate and return speed of the cooling water, which can flush out scale and rust from the equipment and carry away the harmful heat generated inside the equipment.

[0031] In this embodiment, the water pump 3 is a high-pressure pump. The water pump 3 pumps water into the spray tower 4, and the high pressure forms fine atomized water droplets, maximizing the gas-liquid contact area and significantly improving the core processing efficiency of the spray tower, such as cooling, dust removal, and absorption.

[0032] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A method for circulating cooling water in a medium-frequency furnace to prevent clogging and achieve efficient heat dissipation, characterized in that, Includes the following steps: S1, Softening: Water from the water tank (1) flows into the fully automatic water softening device (2) and is softened in the fully automatic water softening device (2) to remove calcium and magnesium ions from the water; S2, Cooling: The water from the fully automatic water softening device (2) is pumped into the spray tower (4) by the water pump (3), and fine atomized water droplets are formed by high pressure, which increases the gas-liquid contact area and quickly reduces the water temperature; S3, Cooling and Reflux: The water from the spray tower (4) enters the medium frequency furnace (5) through the main pipeline. After heat exchange, it becomes hot water and flows out into the return water main pipeline. The hot water returns directly to the water tank (1) through the return water main pipeline and enters the circulation again.

2. The method for circulating cooling water in a medium-frequency furnace with anti-clogging and high-efficiency heat dissipation according to claim 1, characterized in that, The bottom of the water tank (1) is equipped with a grid with an inclination angle of 60° to 80° and a mesh size of 100 to 300. The return water inlet of the water tank (1) is located on the water tank (1) above the grid, and the outlet water inlet is located on the water tank (1) below the grid.

3. The method for circulating cooling water in a medium-frequency furnace with anti-clogging and high-efficiency heat dissipation according to claim 1, characterized in that, Both the main water pipe and the return water main pipe are 90mm pipes.

4. The method for circulating cooling water in a medium-frequency furnace with anti-clogging and high-efficiency heat dissipation according to claim 1, characterized in that, Both the main water pipe and the return water main pipe are made of PP plastic.

5. The method for circulating cooling water in a medium-frequency furnace with anti-clogging and high-efficiency heat dissipation according to claim 1, characterized in that, The water pump (3) is a high-pressure pump.

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