Molten metal cooling system

Abstract

The utility model relates to the technical field of melting and casting cooling, disclose a melting and casting cooling water system, including the furnace front cooling water unit and the furnace rear cooling water unit that carry out the cooling of melting and casting furnace, the furnace front cooling water unit includes the first cooling water unit and the second cooling water unit, the first cooling water unit includes the closed circulation connection primary water pure water tank, primary water water pump and plate heat exchanger, the furnace rear cooling water unit includes the closed circulation connection furnace rear water pure water tank, furnace rear water water pump and plate heat exchanger, the second cooling water unit includes the water tank, the water tank and the cold fluid inlet and outlet water port intercommunication of plate heat exchanger, the hot fluid inlet and outlet water port of plate heat exchanger is connected with primary water pure water tank, furnace rear water pure water tank simultaneously, the utility model discloses the intention reduces the consumption of pure water, reduces operating cost.

Description

Technical Field

[0001] This utility model relates to the field of casting cooling technology, specifically to a casting cooling water system. Background Technology

[0002] In the metal casting process, high-temperature molten metal is melted and cast in a casting furnace, generating a large amount of heat. To ensure production safety, guarantee billet quality, and protect the casting furnace itself, timely and effective cooling of different parts of the furnace is essential. Cooling requirements typically fall into three categories: first, the billet crystallizer, which directly contacts the high-temperature molten metal, requires extremely high cooling efficiency and a pure cooling medium to prevent scaling and blockage; second, the billet undergoes spray or immersion cooling during the casting process; and finally, key components such as the furnace shell, inductors, and water-cooled coils are cooled to prevent damage from overheating.

[0003] Currently, common casting cooling water system designs typically employ either a centralized water supply or a simple branch system. Generally, a large, open circulating water tank is established, using tap water or simply treated industrial water. This water is pressurized by pumps and then delivered to various cooling points within the casting furnace. The heated cooling water returns to a cooling tower for evaporation and cooling, and then is recycled. For casting products with higher requirements, tap water is replaced with purified water. Purified water removes metal ions such as calcium and magnesium, has extremely low hardness, and can maintain the cleanliness of the pipe walls for a long time, ensuring maximum cooling efficiency.

[0004] However, using pure water in an open circulation system results in a large evaporation rate and susceptibility to environmental pollution, leading to excessive conductivity. This necessitates daily replacement with fresh pure water to maintain conductivity within acceptable limits, resulting in significant waste of resources. Furthermore, the high cost of producing pure water further increases the cost of smelting and casting. Utility Model Content

[0005] The present invention aims to provide a melting and casting cooling water system to reduce the consumption of pure water and lower operating costs.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The casting cooling water system includes a furnace front cooling water unit and a furnace rear cooling water unit for cooling the casting furnace. The furnace front cooling water unit includes a primary cooling water unit and a secondary cooling water unit. The primary cooling water unit includes a primary water tank, a primary water pump, and a plate heat exchanger connected in a closed loop. The furnace rear cooling water unit includes a furnace rear water tank, a furnace rear water pump, and a plate heat exchanger connected in a closed loop. The secondary cooling water unit includes a tap water tank. The tap water tank is connected to the cold fluid inlet and outlet of the plate heat exchanger. The hot fluid inlet and outlet of the plate heat exchanger are simultaneously connected to the primary water tank and the furnace rear water tank.

[0007] The principle and advantages of this scheme are: 1. It is divided into three relatively independent circulation units: the primary cooling water unit, the secondary cooling water unit, and the post-furnace cooling water unit. The primary cooling water unit uses pure water to cool the casting mold, the secondary cooling water unit uses tap water to cool the casting billet, and the post-furnace cooling water unit uses pure water to cool the furnace shell, inductors, water-cooled coils, etc. Each cooling unit can precisely cool different parts and different cooling needs during the casting process, which improves the cooling effect and avoids mutual interference between water flows with different cooling needs. This ensures that when one unit fails, other units can still operate normally, reducing the risk of a complete production stoppage and ensuring the quality of the cooling water and the stability of the cooling effect.

[0008] 2. Both the primary cooling water unit and the furnace cooling water unit adopt a closed-loop pure water design. The pure water has no evaporation loss during the entire circulation process, avoiding water waste caused by evaporation. Moreover, it will not be affected by environmental pollution, which could cause the pure water conductivity to exceed the standard. It does not require regular sewage discharge, saving the cost of pure water replenishment and wastewater treatment. It also reduces the water quality treatment cost and energy consumption caused by replenishing water.

[0009] 3. By replacing the water used in the secondary cooling water unit with tap water, the amount of pure water used is reduced. Furthermore, the tap water is evaporated and cooled in the cooling tower without consuming energy. The cooled tap water participates in the secondary cooling process and also cools the pure water through a plate heat exchanger, making full use of the cooling capacity of the tap water and achieving rational utilization of resources.

[0010] Preferably, as an improvement, the primary water tank, the primary water pump, and the plate heat exchanger are connected by a closed pipeline, the hot fluid outlet of the plate heat exchanger is connected to the primary water tank through a primary water return pipeline, the casting furnace is located on the primary water return pipeline, and the plate heat exchanger outputs cooled pure water to perform the first pre-furnace cooling of the casting furnace.

[0011] Technical effect: The above-mentioned setup in this solution connects the primary water tank, the primary water pump, and the plate heat exchanger through closed pipes, forming a closed-loop pure water circulation system. This ensures that the pure water cooled in the first cooling process is completely isolated from the outside world during circulation, preventing the entry of pollutants and the loss of pure water through evaporation, and maintaining stable water quality.

[0012] Preferably, as an improvement, the furnace water tank, the furnace water pump, and the plate heat exchanger are connected by a closed pipeline, the hot fluid outlet of the plate heat exchanger is connected to the furnace water tank through a furnace water return pipeline, the casting furnace is located on the furnace water return pipeline, and the plate heat exchanger outputs cooled pure water to cool the casting furnace.

[0013] Technical benefits: With the above setup, the furnace water tank, the furnace water pump, and the plate heat exchanger are connected by a closed pipeline. The closed-loop design ensures that the pure water in the furnace cooling water unit circulates in a closed loop throughout the entire process, preventing evaporation loss and guaranteeing the stability of the cooling water quality and the reliability of the cooling effect.

[0014] Preferably, as an improvement, a backup return water pipe is provided between the primary water return pipe and the furnace water return pipe, the backup return water pipe connecting the primary water return pipe and the furnace water return pipe, and a switching valve is provided on the backup return water pipe.

[0015] Technical benefits: This solution, with the above-mentioned setup, allows for the switching of pure water to another working tank via a switching valve when either the primary cooling water tank or the post-furnace pure water tank malfunctions, ensuring uninterrupted cooling circulation. Furthermore, in emergencies, the primary cooling water unit and the post-furnace cooling water unit can be temporarily combined for mutual support, providing uninterrupted cooling to the casting furnace and preventing equipment burnout or production accidents due to cooling water interruption, thus ensuring production continuity and safety.

[0016] Preferably, as an improvement, the primary water pure water tank is provided with a first backup pipe, the first backup pipe connecting the primary water pure water tank and the furnace water pump, and the furnace water pure water tank is provided with a second backup pipe, the second backup pipe connecting the furnace water pure water tank and the primary water pump.

[0017] Technical benefits: This solution employs the above-mentioned setup, enabling the primary water pump and the boiler downstream water pump to serve as backups for each other. For example, if the primary water pump fails, the boiler downstream water pump can be activated, drawing water from the boiler downstream pure water tank through the second backup pipeline to supply water to the primary cooling water unit, and vice versa. By using the first and second backup pipelines, the impact of a single pump failure on the system is reduced, dependence on backup pumps is decreased, and the utilization rate of existing equipment and the flexibility of the system are improved.

[0018] Preferably, as an improvement, the second cooling water unit further includes a secondary water pump, a return water tank, and a cooling tower. The tap water tank, the secondary water pump, the return water tank, and the cooling tower are connected in a circulating manner through pipelines. The cooling tower and the tap water tank are connected through a secondary water return pipeline. The casting furnace is located between the secondary water pump and the return water tank.

[0019] Technical benefits: This solution adopts the above setup, where tap water is cooled by evaporation through a cooling tower, which is highly efficient and has low operating costs. It perfectly combines the high-cost closed-loop circulation of pure water with the low-cost open circulation of tap water, ensuring the safety of key equipment while controlling overall operating costs.

[0020] Preferably, as an improvement, the tap water tank is connected to the plate heat exchanger via a heat exchanger pump, and the outlet of the cold fluid of the plate heat exchanger is connected to the cooling tower via a pipe.

[0021] Technical benefits: This solution uses the above setup, which allows for heat exchange between tap water cooled by evaporation and pure water. No energy is introduced to cool the pure water, saving costs. Furthermore, the tap water after heat exchange is returned to the cooling tower for further cooling and recycling, thus fully conserving water resources. Attached Figure Description

[0022] Figure 1 This is a flowchart of the general water system of this utility model.

[0023] Figure 2 This is a flow chart of the pure water system of this utility model.

[0024] The reference numerals in the accompanying drawings include: 1. Tap water tank; 2. Secondary water pump; 3. Secondary water cooling; 4. Return water tank; 5. Cooling tower; 6. Heat exchanger pump; 7. Plate heat exchanger; 8. Primary water tank; 9. Primary water pump; 10. Boiler water tank; 11. Boiler water pump; 12. First backup pipe; 13. Second backup pipe; 14. Backup return water pipe. Detailed Implementation

[0025] The following detailed description illustrates the specific implementation method: Example The basics are as follows: Figure 1-2 As shown: The melting and casting cooling water system includes a furnace front cooling water unit and a furnace back cooling water unit for cooling the melting and casting furnace. The furnace front cooling water unit includes a primary cooling water unit and a secondary cooling water unit. The primary cooling water unit, the secondary cooling water unit, and the furnace back cooling water unit are relatively independent circulation units. The primary cooling water unit uses pure water to cool the casting mold, the secondary cooling water unit uses tap water to cool the melting and casting billet, and the furnace back cooling water unit uses pure water to cool the furnace shell, inductors, water-cooled coils, etc.

[0026] The primary cooling water unit comprises a closed-loop primary water tank 8, a primary water pump 9, and a plate heat exchanger 7. These components are connected via a closed pipeline, ensuring a completely closed-loop circulation of pure water within the unit and preventing evaporation losses. The hot fluid outlet of the plate heat exchanger 7 is connected to the primary water tank 8 via a primary water return pipeline. The casting furnace is located on this return pipeline. The plate heat exchanger 7 outputs cooled pure water to cool the billet crystallizer, and the heated pure water returns directly to the primary water tank 8 through the return pipeline.

[0027] The second cooling water unit includes a circulating water tank 1, a secondary water pump 2, a return water tank 4, and a cooling tower 5. The water tank 1, the secondary water pump 2, the return water tank 4, and the cooling tower 5 are connected by pipes. The cooling tower 5 and the water tank 1 are connected by a secondary water return pipe. The casting furnace is located between the secondary water pump 2 and the return water tank 4. The tap water in the water tank 1 is pressurized by the secondary water pump 2 and transported to the casting furnace to cool the casting billet. The heated tap water flows by gravity into the return water tank 4 and is then pumped to the cooling tower 5 for evaporation and heat dissipation. The cooled tap water returns to the water tank 1 through the secondary water return pipe.

[0028] The furnace cooling water unit includes a closed-loop pure water tank 10, a furnace water pump 11, and a plate heat exchanger 7. The furnace water tank 10, the furnace water pump 11, and the plate heat exchanger 7 are connected by a closed pipeline, meaning that the pure water in the furnace cooling water unit circulates in a closed loop throughout the entire process, preventing evaporation losses. The hot fluid outlet of the plate heat exchanger 7 is connected to the furnace water tank 10 via a furnace water return pipeline. The casting furnace is located on the furnace water return pipeline. The plate heat exchanger 7 outputs cooled pure water to cool the furnace shell, inductors, water-cooled coils, etc. The heated pure water returns directly to the furnace water tank 10 through the furnace water return pipeline.

[0029] Plate heat exchanger 7 cools pure water using cooled tap water. The cold fluid inlet and outlet of plate heat exchanger 7 are connected to tap water tank 1. The hot fluid inlet and outlet of plate heat exchanger 7 are simultaneously connected to primary water pure water tank 8 and furnace water pure water tank 10. That is, tap water tank 1 is connected to the cold fluid inlet of plate heat exchanger 7 through heat exchanger pump 6. The cold fluid outlet of plate heat exchanger 7 is connected to cooling tower 5. Primary water pump 9 and furnace water pump 11 are both connected to the hot fluid inlet of plate heat exchanger 7. The hot fluid outlet of plate heat exchanger 7 leads to the melting furnace. The cooled tap water in the tap water tank 1 is pumped by the heat exchanger pump 6 to the plate heat exchanger 7 to cool the pure water flowing through the plate heat exchanger 7. The heated tap water flows through the pipe to the cooling tower 5 for evaporation and cooling, and then returns to the tap water tank 1 to wait for the next cycle. Meanwhile, the high-temperature pure water in the primary water tank 8 is pumped by the primary water pump 9 to the plate heat exchanger 7 for cooling. The cooled pure water flows through the pipe to the casting furnace to cool the billet crystallizer. The high-temperature pure water in the furnace water tank 10 is pumped by the furnace water pump 11 to the plate heat exchanger 7 for cooling. The cooled pure water flows through the pipe to the casting furnace to cool the furnace shell, inductors, water-cooled coils, etc.

[0030] like Figure 2 As shown, a backup return water pipe 14 is provided between the primary water return pipe and the furnace water return pipe. The backup return water pipe 14 connects the primary water return pipe and the furnace water return pipe. A switching valve is provided on the backup return water pipe 14 so that when the pure water in the primary cooling water unit returns, it can enter the furnace water pure water tank 10 through the backup return water pipe 14, and when the pure water in the furnace cooling water unit returns, it can enter the primary water pure water tank 8 through the backup return water pipe 14.

[0031] A first backup pipe 12 is provided on the primary water pure water tank 8, which connects the primary water pure water tank 8 to the furnace water pump 11, so that the furnace water pump 11 can transport the pure water in the primary water pure water tank 8 to the plate heat exchanger 7 to participate in the furnace cooling process; a second backup pipe 13 is provided on the furnace water pure water tank 10, which connects the furnace water pure water tank 10 to the primary water pump 9, so that the primary water pump 9 can transport the pure water in the furnace water pure water tank 10 to the plate heat exchanger 7 to participate in the furnace first cooling process.

[0032] In actual use, firstly, the primary water pump 9 pressurizes the pure water in the primary pure water tank 8 and delivers it to the plate heat exchanger 7 for cooling. The cooled pure water then flows into the casting furnace to cool the billet crystallizer. The heated pure water returns to the primary pure water tank 8 through the primary water return pipe, awaiting the next cycle. Then, the secondary water pump 2 pressurizes the tap water in the tap water tank 1 and delivers it directly to the casting furnace to cool the cast billet. The heated tap water flows into the return water tank 4. Then, the water is pressurized by a water pump and transported to the cooling tower 5 for evaporation and cooling. The cooled tap water returns to the tap water tank 1 through the secondary water return pipe, waiting for the next cycle. Finally, the furnace water pump 11 pressurizes the pure water in the furnace water pure water tank 10 and transports it to the plate heat exchanger 7 for cooling. The cooled pure water is then passed into the melting furnace to cool the furnace shell, inductor, water-cooled coil, etc. The heated pure water returns to the furnace water pure water tank 10 through the furnace water return pipe, waiting for the next cycle.

[0033] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A casting cooling water system, characterized in that: The system includes a furnace front cooling water unit and a furnace rear cooling water unit for cooling a casting furnace. The furnace front cooling water unit includes a primary cooling water unit and a secondary cooling water unit. The primary cooling water unit includes a primary water tank, a primary water pump, and a plate heat exchanger connected in a closed loop. The furnace rear cooling water unit includes a furnace rear water tank, a furnace rear water pump, and a plate heat exchanger connected in a closed loop. The secondary cooling water unit includes a tap water tank, which is connected to the cold fluid inlet and outlet of the plate heat exchanger. The hot fluid inlet and outlet of the plate heat exchanger are simultaneously connected to both the primary water tank and the furnace rear water tank.

2. The casting cooling water system according to claim 1, characterized in that: The primary water tank, primary water pump, and plate heat exchanger are connected by a closed pipeline. The hot fluid outlet of the plate heat exchanger is connected to the primary water tank through a primary water return pipeline. The casting furnace is located on the primary water return pipeline. The plate heat exchanger outputs cooled pure water to perform the first cooling of the casting furnace.

3. The casting cooling water system according to claim 2, characterized in that: The furnace water tank, the furnace water pump, and the plate heat exchanger are connected by a closed pipeline. The hot fluid outlet of the plate heat exchanger is connected to the furnace water tank through a furnace water return pipeline. The casting furnace is located on the furnace water return pipeline. The plate heat exchanger outputs cooled pure water to cool the casting furnace.

4. The casting cooling water system according to claim 3, characterized in that: A backup return water pipe is provided between the primary water return pipe and the furnace water return pipe. The backup return water pipe connects the primary water return pipe and the furnace water return pipe, and a switching valve is provided on the backup return water pipe.

5. The casting cooling water system according to claim 1, characterized in that: The primary water tank is equipped with a first backup pipe, which connects the primary water tank to the furnace water pump. The furnace water tank is also equipped with a second backup pipe, which connects the furnace water tank to the primary water pump.

6. The casting cooling water system according to claim 1, characterized in that: The second cooling water unit also includes a secondary water pump, a return water tank, and a cooling tower. The tap water tank, the secondary water pump, the return water tank, and the cooling tower are connected in a circulating manner through pipelines. The cooling tower and the tap water tank are connected through a secondary water return pipeline. The casting furnace is located between the secondary water pump and the return water tank.

7. The casting cooling water system according to claim 6, characterized in that: The tap water tank is connected to the plate heat exchanger via a heat exchanger pump, and the outlet of the cold fluid of the plate heat exchanger is connected to the cooling tower via a pipe.

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