Intermediate frequency furnace refrigerant system and technological method
By designing the refrigerant system for the medium frequency furnace, the pollution risk and high water consumption problems of the medium frequency furnace cooling system were solved, efficient and low-cost cooling effects were achieved, and the stable operation of the equipment and product quality were ensured.
Patent Information
- Application Number
- CN202510817021.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-18
- Publication Date
- 2025-10-10
AI Technical Summary
The medium frequency furnace generates a lot of heat during operation and requires an effective cooling system to control the temperature. The existing system has problems such as pollution risk, high water consumption and high treatment costs.
A medium frequency furnace refrigerant system was designed, including a refrigerant water supply system, a circulating pressurization system, a pipeline filter system, a fiber ball filter system, and a cooling tower system. It uses automated control and multiple water supply methods, combined with pump and valve interlocking and backup equipment, to ensure stable system operation and water quality that meets requirements.
It achieves efficient cooling of the medium frequency furnace, reduces water consumption and treatment costs, reduces pollution risks, improves the system's automation level and equipment reliability, and ensures stable product quality.
Smart Images
Figure CN120760461A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of water treatment, and in particular to a medium frequency furnace refrigerant system and a process method. Background Art
[0002] Medium frequency furnaces utilize medium frequency power for induction heating, melting, and heat preservation. They are primarily used for melting carbon steel, alloy steel, and specialty steel. They can also be used for melting and heating non-ferrous metals such as copper and aluminum. They are compact, lightweight, consume little power, and offer rapid melting and heating times, easy temperature control, and high production efficiency. They are a new generation of metal heating and melting equipment, gradually replacing coal-fired, gas-fired, oil-fired, and conventional resistance furnaces.
[0003] At the same time, an induced current is generated in the charge. When the induced current passes through the charge, it heats the charge and causes it to melt. The medium frequency furnace is also an induction furnace. It uses an inverter power supply to rectify the AC power into DC power, which is then converted into 300-1000H by the inverter. Z Medium-frequency pulsed alternating current forms a magnetic field when passing through the copper ring in the furnace. The magnetic field causes eddy currents in the steel in the ring. The eddy currents flow through the heated steel, generating heat, thereby achieving the purpose of melting the steel.
[0004] When the medium frequency furnace is working, the furnace body and the power supply part will generate a lot of heat and the temperature will rise sharply. It is necessary to cool down the temperature to keep it within a reasonable range to ensure the normal operation of the equipment. Water is a good cooling medium. A cooling system using water as the medium is invented, which is mainly used to cool the power supply and the furnace body.
[0005] A medium frequency furnace refrigerant system and process technology have been invented. The system meets the cooling needs of the medium frequency furnace and ensures the normal operation of the medium frequency furnace equipment. At the same time, the system and technology also realize the recycling of the system refrigerant water, and partially recycle the semi-closed system to avoid contact with the outside world, reduce pollution risks, reduce water consumption and processing costs, and improve the economic benefits of the enterprise. At the same time, the system has a high degree of automation and realizes automatic operation of the system equipment through many innovative technologies and methods. Summary of the Invention
[0006] The purpose of the present invention is to provide a medium frequency furnace refrigerant system and process method in response to the above problems. The purpose of the present invention is achieved as follows: A medium frequency furnace refrigerant system and process method, including: (1) medium frequency furnace refrigerant water supply system: The refrigerant water supply system uses two media water sources for replenishment. The system consists of a water replenishment pipeline and two water replenishment valves and a liquid level gauge. The water replenishment valve has two operating modes: manual and automatic. In the automatic mode, the water replenishment valve is interlocked with the liquid level gauge to open the valve to replenish water when the water tank is set at a low liquid level of 3.8 meters. The valve is closed at a high liquid level of 4.2 meters, and the refrigerant water level and parameters are kept within 2-4.6 meters; (2) refrigerant water circulation pressurization system: the refrigerant water tank The water source is pressurized to 0.6-1Mpa by the water supply pump and output to the medium frequency furnace heat exchanger. The system consists of 4 pressure pumps and 4 electric valves matched with the pump body. Three in use and one in standby are adopted during operation. The system adopts the pump-valve interlocking mode. When starting, the pump is started first and then the valve is opened. When stopping, the valve is closed first and then the pump is stopped. (3) Pipeline filter system: a self-cleaning filter is adopted. The pipeline filter, that is, the self-cleaning filter, is backwashed in two ways: "timing" and "pressure difference". "Pressure difference" takes priority. When the pipeline filter is backwashed, the drain valve opens automatically. The imported pipeline filter electric motor drives the electric brush to run clockwise. "Pressure difference" type automatic cleaning The condition is that the pressure difference exceeds 0.5 bar. Under normal circumstances, the pipeline filter can be automatically cleaned when it is put into use. During operation, care should be taken to prevent the filter from not automatically backwashing when the pressure difference exceeds 0.5 bar. A bypass valve is provided at the connection part of the pipeline filter. When the pipeline filter fails or is under maintenance, the refrigerant water can circulate from the bypass to ensure the normal operation of the system; (4) Fiber ball filter system: A fiber ball filter is used. The fiber ball filter needs to be automatically backwashed every 2h-3h of operation. Before backwashing, the spare filter is put into use first, and one filter is withdrawn for backwashing to ensure that the outlet pipe network is backwashed and water is discharged. After backwashing, the filter is closed. The filter backwash inlet gate is closed to keep the filter in standby state. The filter control adopts two modes: centralized manual and automatic operation. In centralized manual mode, each device needs to be operated manually. In automatic mode, select the filter to be started, click "Start", and the filter will automatically start working until the end; (5) Cooling tower system: The system has a total of 4 cooling fans, and the number of start and stop can be adjusted according to the actual temperature. When the screen is manually operated, each fan can be operated separately. In automatic mode, four fans are grouped together. The automatic start and stop are determined according to the temperature setting value, that is, 35℃ start and 30℃ stop to ensure that the temperature is controlled within the set value range.
[0007] (1) The indicators and requirements of the medium frequency furnace refrigerant water system are: water temperature: 30-35℃, PH: 6.8-9.5, turbidity: ≤20mg / l, oil content: ≤1mg / l, total iron: ≤1mg / l, chloride: ≤1000mg / l, total hardness: ≤50 mg / l, conductivity: ≤1200us / l, pressure: 0.4-0.8 Mpa.
[0008] The beneficial effects of the present application are: after the application of the present application, the cooling requirements of the intermediate frequency furnace are met, the normal operation of the power supply and the furnace body equipment is ensured, and the quality of the produced products is stable and controlled. The system has high automation degree, reasonable process layout, low running cost, realizes circular development and sustainable development, fully considers emergency situations, can realize online maintenance of many devices, does not affect the operation of the system, and effectively realizes the maximization of system equipment benefits and the stability and reliability of the system. BRIEF DESCRIPTION OF DRAWINGS
[0009] The present application will be further described below with reference to the accompanying drawings.
[0010] Figure 1 is the process flow chart of the present application. 1. Cooling tower, 2. Intermediate frequency furnace plate heat exchanger, 3. Fiber ball filter, 4. Pipeline filter, 5. Refrigerant water pool. DETAILED DESCRIPTION
[0011] In order to meet the cooling requirements of the intermediate frequency furnace body and the power supply part of the new steelmaking, ensure the normal operation of the equipment during the production process and the stable control of the quality of the produced products, the present application provides an intermediate frequency furnace refrigerant system and process technology. Mainly through the application of the system and process technology, not only the cooling equipment requirements of the intermediate frequency furnace are met, but also the normal operation of the intermediate frequency furnace as a whole is ensured. The system has reasonable layout, advanced process technology, high automation degree, reduces manual intervention, has good system stability and high reliability, overcomes some common system drawbacks, and ensures the reliable operation of the intermediate frequency furnace in the steelmaking system and the stable control of the product quality.
[0012] Refrigerant system and process technology: (1) Intermediate frequency furnace refrigerant water supply system: the refrigerant water supply system mainly uses two kinds of water sources to supplement, which not only avoids the uncertainty factors caused by the supplementation of one kind of medium, but also realizes the selective supplementation of two kinds of media by considering the actual factors such as water source, benefit, process, etc. The system mainly consists of a water replenishing pipeline, two water replenishing valves and related measuring instruments, i.e. liquid level meters. The water replenishing valves have manual and automatic operation modes. In the automatic mode, the water replenishing valves are interlocked with the liquid level transmitters, i.e. liquid level meters, of the refrigerant water pool, so that the valve is opened for water replenishment when the liquid level is low, and the valve is closed when the liquid level is high, so that the liquid level and parameters of the refrigerant water are always maintained within the specified value range. The two water replenishing pipelines are connected in parallel, and each pipeline is equipped with an electric valve, which is controlled by the liquid level.
[0013]
[0014] (2) Refrigerant water circulation pressurization system: The water source of the refrigerant water pool is pressurized and output by the water supply pump to the medium frequency furnace heat exchanger, and the medium frequency furnace is cooled by heat exchange. The system consists of 4 booster pumps and 4 electric valves matched with the pump body. During operation, three are used and one is standby to ensure that the system pressure and flow meet the process requirements. At the same time, in order to increase the reliability of the system, a standby working mode is adopted. When the running pump fails, the standby pump is quickly and automatically switched to meet the process requirements. At the same time, in order to reduce the load on the booster pump, the system adopts a pump-valve interlocking mode. When starting, the pump is started first and then the valve is opened. When stopping, the valve is closed first and then the pump is stopped. At the same time, the system can blindly select 3 of the 4 pumps to run, and the remaining 1 is used as a standby, truly achieving the goal of "blind selection", avoiding the traditional standby pump that can only be a fixed pump, and greatly improving the flexibility of the system.
[0015]
[0016] (3) Pipeline filter system: The refrigerant water of the medium frequency furnace system adopts a semi-closed system. During operation, it is not only partially polluted by the outside world and oxidized by the air, producing a pollutant, but also the cooling equipment will produce a certain amount of scale. In addition, the circulation pipeline will also produce a certain amount of rust, causing a certain deterioration of the water quality. For this reason, a self-cleaning filter is added to the system. The backwashing of the pipeline filter is divided into two modes: "timing" and "pressure difference". "Pressure difference" is given priority. When the pipeline filter is backwashed, the drain valve will automatically open, and the imported pipeline filter electric motor drives the electric brush to run clockwise. The "pressure difference" automatic cleaning condition is that the pressure difference exceeds 0.5 bar (0.05Mpa). Under normal circumstances, the pipeline filter can be automatically cleaned when it is put into use. During operation, care should be taken to prevent the filter from automatically backwashing when the pressure difference exceeds 0.5 bar. A bypass valve is provided at the connection part of the pipeline filter. When the pipeline filter fails or is under maintenance, the refrigerant water can circulate from the bypass to ensure the normal operation of the system.
[0017]
[0018] (4) Fiber ball filter system: After the refrigerant water is used, the impurities in the water increase, and the most obvious ones are suspended solids, organic matter, colloids, metals, etc., and the oil content also increases. In order to be able to reuse it, a fiber ball filter system must be added to the system to treat it and meet the water use standards. The high-efficiency and fast fiber ball filter needs to be automatically backwashed every time it runs for a period of time. Before backwashing, the spare filter is put into use first, and one filter is withdrawn for backwashing to ensure that the outlet pipe network backwashes water. After backwashing is completed, the filter backwash inlet gate is closed to keep the filter in standby status. The filter control adopts two modes: centralized manual and automatic operation. In centralized manual mode, each device needs to be manually operated. In automatic mode, select the filter to be started, click "Start", and the filter will automatically start working until it ends.
[0019] (5) Cooling tower system: After the refrigerant water is used, its temperature rises rapidly. In order to be able to control it within the reasonable design range, a cooling tower system is added to cool it down. The system is equipped with 4 cooling fans, and the number of start and stop can be adjusted according to the actual temperature. At the same time, every four fans in the system are grouped together. When the screen is manually operated, each fan can be operated separately. When it is automatic, four fans are grouped together and automatically start and stop according to the temperature setting value to ensure that the temperature is controlled within the set value range.
[0020]
[0021] The above technology is used in the cooling system of the medium frequency furnace production line of Taigang's new steelmaking. The medium frequency furnace refrigerant system mainly includes the medium frequency furnace refrigerant water supply system, water supply circulation pressurization system, pipeline filter system, fiber ball filter system, and cooling tower system. Through the combination and effective coordination of the above systems, the important parameters of the system water quality are guaranteed as follows: water temperature 28°C, PH:7 turbidity 15mg / l, chloride 800mg / l, conductivity 1000mg / l, pressure (Mpa) 0.6Mpa, and at the same time fully meet the cooling needs of the medium frequency furnace, effectively ensuring the production.
[0022] The above description is only a specific embodiment of the present invention, but the structural features protected by the present invention are not limited thereto. Any changes or modifications made by any technician in this field within the scope of the present invention are included in the patent scope of the present invention.
Claims
1. A medium frequency furnace refrigerant system and process method, characterized by: include: (1) Refrigerant water supply system for medium frequency furnace: The refrigerant water supply system uses two medium water sources for replenishment. The system consists of a water replenishment pipeline, two water replenishment valves and a liquid level gauge. The water replenishment valve has two operating modes: manual and automatic. In the automatic mode, the water replenishment valve is interlocked with the liquid level gauge to open the valve to replenish water at the set low liquid level of the water pool. The low liquid level is 3.8 meters. The valve is closed at the high liquid level, which is 4.2 meters. The refrigerant water level and parameters are kept within 2-4.6 meters. (2) Refrigerant water circulation pressurization system: The water source of the refrigerant water pool is pressurized to 0.6-1Mpa by the water supply pump and output to the medium frequency furnace heat exchanger. The system consists of 4 pressure pumps and 4 electric valves matched with the pump body. Three are used and one is in standby mode during operation. The system adopts pump-valve interlocking mode. When starting, the pump is started first and then the valve is opened. When stopping, the valve is closed first and then the pump is stopped. (3) Pipeline filter system: Self-cleaning filter is used. The backwashing of pipeline filter is divided into two modes: "timing" and "pressure difference". "Pressure difference" is preferred. When the pipeline filter is backwashed, the drain valve opens automatically, and the electric motor of the imported pipeline filter drives the electric brush to run clockwise. The "pressure difference" automatic cleaning condition is that the pressure difference exceeds 0.5 bar. Under normal circumstances, the pipeline filter can be automatically cleaned when it is put into use. During operation, it is necessary to pay attention to prevent the filter from automatically backwashing when the pressure difference exceeds 0.5 bar. A bypass valve is provided at the connection part of the pipeline filter. When the pipeline filter fails or is under maintenance, the refrigerant water can circulate from the bypass to ensure the normal operation of the system. (4) Fiber ball filter system: Fiber ball filter is used. The fiber ball filter needs to be automatically backwashed every 2-3 hours of operation. Before backwashing, the spare filter is put into use first, and one filter is withdrawn for backwashing to ensure that the outlet pipe network is backwashed and water is discharged. After backwashing is completed, the filter backwash inlet gate is closed to keep the filter in standby state. The filter control adopts centralized manual and automatic operation. In centralized manual mode, each device needs to be manually operated. In automatic mode, select the filter to be started, click "Start", and the filter will automatically start working until the end; (5) Cooling tower system: The system is equipped with 4 cooling fans, which can be started and stopped according to the actual temperature. When manually operated on the screen, each fan can be operated individually. When automatically operated, four fans are grouped together. The automatic start and stop are determined according to the temperature setting value, that is, 35℃ to start and 30℃ to stop, to ensure that the temperature is controlled within the set value range.
2. A medium frequency furnace refrigerant system and process according to claim 1, characterized in that: (1) The indicators and requirements of the medium frequency furnace refrigerant water system are: water temperature: 30-35℃, PH: 6.8-9.5, turbidity: ≤20mg / l, oil content: ≤1mg / l, total iron: ≤1mg / l, chloride: ≤1000mg / l, total hardness: ≤50 mg / l, conductivity: ≤1200us / l, pressure: 0.4-0.8Mpa.