Efficient and energy-saving furnace-front water-cooling plate cooling system

Abstract

The invention discloses an efficient and energy-saving furnace front water cooling plate cooling system. The furnace-front water-cooling plate cooling system is characterized by comprising a circulating water tank, a plurality of groups of water-cooling plates, a water return tank and a concentrated brine tank which are connected through pipelines. Through the application of the system, the peripheral temperature of the iron notch can be reduced to 70-90 DEG C from 100-120 DEG C, and the temperature reduction amplitude reaches 30%. The damage to peripheral equipment of the iron notch caused by high temperature can be greatly avoided; meanwhile, the temperature above the iron notch is reduced to about 120 DEG C from 200-300 DEG C, a steel structure above the iron notch can be well protected, deformation caused by high temperature is avoided, and the bearing capacity of the steel structure meets the weight requirement of tuyere equipment for replacing a mechanical forklift and a sleeve replacing machine. By the adoption of the cooling system, water resources can be utilized to the maximum extent, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace cooling systems, and in particular relates to a high-efficiency and energy-saving furnace front water-cooling plate temperature reduction cooling system. Background Art

[0002] During blast furnace tapping, the molten iron reaches high temperatures, exceeding 1450°C. Due to the confined space around the taphole, the molten iron heat transfers through the taphole, causing temperatures on both sides to reach 100°C-120°C, and above the taphole to reach 200°C-300°C. These high temperatures can damage equipment in the taphole area, such as the tapping machine, mud gun, and its hydraulic hoses. Furthermore, the steel structure above the taphole supports the blast furnace tuyere platform. This load-bearing structure must also withstand the weight of mechanical forklifts and changers required for tuyere equipment replacement. Prolonged exposure to high temperatures can cause the steel structure to deform or even lose its original load-bearing capacity, posing a serious safety hazard or restricting the efficiency of the tuyere platform's mechanical operations. Therefore, developing a simple, efficient, and stable cooling system to protect the equipment around the taphole and the supporting structure of the tuyere platform above the taphole is crucial. Summary of the Invention

[0003] The object of the present invention is to provide a high-efficiency and energy-saving furnace front water-cooling plate cooling system.

[0004] The object of the present invention is achieved by providing a high-efficiency and energy-saving furnace front water-cooling plate cooling system, comprising a circulating water pool, multiple groups of water-cooling plates, a return water tank and a concentrated brine pool connected by pipelines; The water-cooling plate 7 is provided with a direct cooling pipe, an elbow, a water inlet, a water outlet and a diversion port. The direct cooling pipe is a DN40 20# steel pipe, and the elbow is a DN40 U-shaped 180° elbow. The water inlet of the water-cooled plate is connected to the circulating water pool through a soft water pipe. The soft water pipe is sequentially provided with a soft water front control butterfly valve, a soft water booster pump, a soft water rear control butterfly valve, and a water-cooled plate front control ball valve from the circulating water pool to the water-cooled plate 7. The water outlet of the water cooling plate is connected to the water inlet of the return water tank through a pipe, and the water outlet of the return water tank is connected to the water inlet of the circulating water pool through a pipe; the diversion port of the water cooling plate is connected to the water inlet of the slag treatment brine pool through a diversion pipe.

[0005] The beneficial effects of the present invention are: 1) Through the use of the system of the present invention, the temperature around the taphole can be reduced from 100-120°C to 70-90°C, a temperature reduction of 30%. This can significantly prevent damage to equipment around the taphole caused by high temperatures. At the same time, the temperature above the taphole is reduced from 200-300°C to approximately 120°C, effectively protecting the steel structure above the taphole from deformation due to high temperatures and ensuring that its load-bearing capacity meets the weight requirements of a mechanical forklift and a sleeve replacement machine for replacing the tuyere equipment.

[0006] 2) The cooling system of this invention maximizes water resource utilization, achieving energy conservation and emission reduction. Water discharged from the diversion port is discharged into a slag treatment brine pool. This brine is then pumped to the slag flushing ditch in front of the furnace for use as slag flushing water. The water discharged from the diversion port is reused, achieving energy conservation and emission reduction.

[0007] 3) The cooling system of the present invention can extend the service life of the water-cooled plate to 3-5 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a structural diagram of a single water-cooled plate of the present invention, where S1 is the water inlet, S2 is the water outlet, S3 is the diversion port, S5 is the direct cooling pipe, and S6 is the elbow. Figure 2 This is the structural diagram of the water-cooled plate cooling system, where 1-electric water supply valve, 2-liquid level monitoring device, 3-soft water front control butterfly valve, 4-soft water booster pump, 5-soft water rear control butterfly valve, 6-water-cooled plate front control ball valve, 7-water-cooled plate, 8-diverter ball valve, 9-ball valve, 10-water-cooled plate rear control ball valve, 11-return water tank, 12-diverter front control gate valve, 13-electric flow meter, 14-diverter rear control gate valve DN200, 15-slag treatment brine pool, 16-butterfly valve, 17-brine pump, 18-butterfly valve, 19-PLC control cabinet, 20-monitor, 21-butterfly valve, 22-circulating water pool S1-water inlet, S2-water outlet, S3-diverter port, S4-diverter pipe. DETAILED DESCRIPTION

[0009] The present invention will be further described in detail below with reference to the embodiments, but the present invention is not limited in any way. Any changes or improvements made based on the teachings of the present invention fall within the scope of protection of the present invention.

[0010] An efficient and energy-saving furnace front water-cooling plate cooling system includes a circulating water pool, multiple groups of water-cooling plates, a return water tank and a concentrated brine pool connected by pipes; The water-cooling plate 7 is provided with an S5 direct cooling pipe, an elbow S6, a water inlet S1, a water outlet S2 and a diversion port S3. The direct cooling pipe S5 is a DN40 20# steel pipe, and the elbow S6 is a DN40 U-shaped 180° elbow. The water inlet S1 of the water-cooled plate 7 is connected to the circulating water pool 22 through a soft water pipe. The soft water pipe is provided with a soft water front control butterfly valve 3, a soft water booster pump 4, a soft water rear control butterfly valve 5, and a water-cooled plate front control ball valve 6 in sequence from the circulating water pool 22 to the water-cooled plate 7. The water outlet S2 of the water-cooled plate 7 is connected to the water inlet of the return water tank 11 through a pipe, and the water outlet of the return water tank 11 is connected to the water inlet of the circulating water pool 22 through a pipe; the diversion port S3 of the water-cooled plate 7 is connected to the water inlet of the slag treatment brine pool 15 through a diversion pipe S4.

[0011] The diversion pipeline S4 is provided with a diversion post-control gate valve 14, an electric flow meter 13 (DN200) and a diversion post-control gate valve 14. The electric flow meter 13 (DN200) can accurately monitor the water volume in the diversion pipeline, thereby adjusting the diversion pre-control gate valve 12 to increase or decrease the diverted water volume: the electric flow meter 13 is connected to the PLC control cabinet 19, and the PLC control cabinet 19 transmits the signal to the monitor 20 to realize dynamic monitoring of the water volume.

[0012] The water inlet S1, the water outlet S2 and the diversion port S3 of the water cooling plate 7 all have a diameter of DN40.

[0013] The pipe connecting the water inlet S1 of the water-cooling plate 7 and the circulating water pool 22 is a DN200 seamless pipe.

[0014] The diversion pipe S4 is a DN200 seamless pipe.

[0015] In the present invention, all ball valves are DN40 ball valves, all gate valves are DN200 gate valves, and all butterfly valves are DN200 butterfly valves.

[0016] The circulating water tank 22 is equipped with a liquid level monitoring device 2 and an electric water supply valve 1 (DN200) connected to the PLC control cabinet 19. The liquid level monitoring device transmits a liquid level signal to the PLC control cabinet 19, which automatically controls the opening and closing of the electric water supply valve 1, adjusting the amount of water replenished according to the desired liquid level. After the cooling water is partially diverted through the water-cooling plate diversion port S3, the water level in the circulating water tank drops. To achieve a balanced water level in the circulating water tank 22, the water diverted from diversion port S3 is monitored by the liquid level monitoring device 2 within the circulating water tank 22, and new water is automatically added to balance the water level. This new water is neutralized with the water in the original circulating water tank 22, lowering the overall temperature of the cooling water in the circulating water tank 22. When the neutralized water flows to the water-cooling plate 7, its temperature is even lower, thereby improving the cooling efficiency of the water-cooling plate.

[0017] The liquid level is set as follows: the water replenishment level is 2.8m and the water stop level is 3.5m; when the water pool liquid level is lower than 2.8m, the electric water replenishment valve 1 automatically opens, and when the water pool liquid level is replenished to 3.5m, the electric water replenishment valve 1 automatically stops.

[0018] The concentrated brine in the slag treatment brine pool 15 flows to the slag flushing ditch through the concentrated brine pump 17 for use in slag flushing.

[0019] Example 1 To meet the high-temperature cooling requirements during blast furnace tapping (molten iron temperature reaches up to 1450°C), the water-cooled plates must withstand extreme heat loads. The cooling system of the present invention achieves efficient heat exchange and circulation control through the following process: 1. When the taphole is open, a soft water booster pump pressurizes soft water from the circulating water pool 22 and delivers it through a pipe via water inlet S1 to the six sets of water-cooled plates 7. (The flow rate at water inlet S1 is regulated by the soft water pre-control butterfly valve 3 and the soft water booster pump 4. The soft water pre-control butterfly valve 3 initially controls the water flow, while the soft water booster pump 4 increases the water pressure to ensure sufficient cooling water for the water-cooled plates.) The diverter ball valves 8 and diverter pre-control gate valves 12 for the six sets of water-cooled plates are fully opened. Part of the cooling water is discharged directly into the brine pool 15 through a diverter pipe (DN200), forming an open loop and not entering the circulating water pool. The remaining cooling water flows back through a pipe via outlet S2 to the return tank 11 and then back to the circulating water pool 22. The flow rate at outlet S2 is regulated by the water-cooled plate post-control ball valve 10, which is manually and dynamically adjusted based on the water level in the return tank 11 (visible to the naked eye). If the return water tank 11 is full, close the valve to 1 / 3-1 / 2 position.

[0020] 2. As part of the cooling water is discharged through the diversion pipe S4, the liquid level of the circulating water pool 22 drops due to the reduction of the return water volume.

[0021] When the liquid level drops to the interlocking threshold of 2.8m, the electric water supply valve 1 (DN200) automatically opens, and when the liquid level in the circulating water pool 22 is replenished to 3.5m, the electric water supply valve 1 automatically stops; new water with a low temperature of 20-25℃ is added, and after the new water is mixed with the high-temperature water of 80-90℃ flowing back through the return tank 11, the overall water temperature is effectively neutralized to 32-42℃, maintaining the thermal balance of the system.

[0022] 3. The mixed cooling water in the circulating water pool 22 is pressurized by the soft water booster pump 4 and re-delivered to the water cooling plate 7 in front of the furnace, forming This forms a closed-loop process of "cooling → diversion → water replenishment → mixed cooling → recirculation", ensuring the continuous and stable operation of the water-cooled plate 7.

[0023] 4. When the taphole is out of use, close the diversion front control gate valve DN200 12 to 1 / 3 of the opening, significantly reducing the diverted water volume, reducing the frequency of water replenishment in the circulating water pool 22, maintaining a stable liquid level and saving water resources.

[0024] The diversion pipe S4 connecting the diversion port S3 of the present invention and the slag treatment brine pool is DN200, the water velocity V=2m / s, and the calculation is 24 hours a day and 365 days a year. The annual water saving amount Q=3.14×0.1×0.1×2×3600×24×365=1980460.8 m³.

[0025] Table 1 shows the comparison of the iron mouth peripheral temperature and water cooling plate life data of a blast furnace before and after the cooling system of the present invention is adopted.

[0026] Table 1 Data on the periphery temperature of the iron mouth and the life of the water cooling plate of a blast furnace before and after the cooling system of the present invention is adopted Before use After use Improvement rate Taphole surrounding temperature 100-120℃ 70-90℃ 25-30% Temperature above taphole 200-300℃ 110-120℃ 45-60% Water cooling plate life 0.8-1 year 3-5 years 275-400% As shown in Table 1, after using the system of the present invention, the temperature around the taphole can be reduced from 100-120°C to 70-90°C, a temperature drop of 30%, and the service life of the water-cooled plate is extended to 3-5 years.

[0027] Experimental Example 1 1. Analyze the thermal resistance of the steel structure above the taphole and select the appropriate material for the water-cooled plate.

[0028] According to the thermal resistance of single-layer structure R=δ / λ(m2.K / w), Where: δ—material layer thickness (m); λ—material thermal conductivity [W / (mk)]; The bearing structure of the tuyere platform above the taphole is H-shaped steel with a thickness of 0.4m. The thermal conductivity is 48.85KW / (mc) at 100 degrees Celsius; 44.19KW / (mc) at 200 degrees Celsius; and 41.87KW / (mc) at 300 degrees Celsius. The thermal resistance of the steel structure at no temperature can be calculated: R = 0.4 / 48.85 = 0.00819m at 100 degrees Celsius. 2 C / kW, at 200℃, R=0.4 / 44.19=0.009m 2 C / kW; at 300 degrees Celsius, R=0.4 / 41.87=0.0095m 2 C / kW, 20# steel pipe is selected as the channel of the direct cooling pipe of the water-cooled plate based on economic and performance requirements. The thermal conductivity of 20# steel pipe is 401.163W / (m*c). 20# steel pipe is high-quality low-carbon carbon steel, and its thermal resistance R=0.4 / 0.401=0.997m 2 C / kW, combined with the background technology that the surrounding temperature of the taphole is 70-100℃ and the upper temperature can reach 200-300℃, it is reasonable to choose 20# steel pipe as the channel of the direct cooling pipe of the water-cooled plate.

[0029] 2. Production of water cooling plate Step 1: Measure the area S (length a × width b) above the taphole where the water cooling plate needs to be placed. Design and manufacture the water cooling plate based on the area above the taphole.

[0030] Step 2: If Figure 1 As shown, six groups of direct cooling pipes S5 and 180-degree elbows S6 are welded to form a single group of water cooling plates.

[0031] 3. System Installation 1) Hoisting and positioning: Use hoisting equipment to lift the 6 groups of water-cooled plates 7 one by one to the designated position just above the iron trough of the blast furnace taphole to ensure the accurate alignment of the water-cooled plates.

[0032] 2) Fixed welding: The six groups of water-cooling plates 7 are firmly fixed to the steel structure above the taphole through welding technology to ensure their stability and safety in high-temperature working environment.

[0033] 3) Pipeline connection: weld the water inlet S1, water outlet S2 and diversion port S2 of each group of water-cooling plates 7 to the system pipeline in sequence to form a complete water-cooling circulation loop to ensure the normal operation of the cooling system.

Claims

1. A high-efficiency and energy-saving furnace front water-cooling plate cooling system, characterized in that: It includes a circulating water pool, multiple groups of water cooling plates, a return water tank and a concentrated brine pool connected by pipes; The water-cooling plate is provided with a direct cooling pipe, an elbow, a water inlet, a water outlet and a diversion port. The direct cooling pipe is a DN40 20# steel pipe, and the elbow is a DN40 U-shaped 180° elbow. The water inlet of the water-cooled plate is connected to the circulating water pool through a soft water pipe. The soft water pipe is provided with a soft water front control butterfly valve, a soft water booster pump, a soft water rear control butterfly valve, and a water-cooled plate front control ball valve in sequence from the circulating water pool to the water-cooled plate. The water outlet of the water cooling plate is connected to the water inlet of the return water tank through a pipe, and the water outlet of the return water tank is connected to the water inlet of the circulating water pool through a pipe; the diversion port of the water cooling plate is connected to the water inlet of the slag treatment brine pool through a diversion pipe.

2. The furnace front water cooling plate cooling system according to claim 1 is characterized in that: The diversion pipeline is provided with a gate valve and a flow meter, and the flow meter is connected to a PLC control cabinet. The PLC control cabinet transmits the signal to the monitor to realize dynamic monitoring of the water volume.

3. The furnace front water cooling plate cooling system according to claim 1 is characterized in that: The diameters of the water inlet, water outlet and diversion port of the water cooling plate are all DN40.

4. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The pipe connecting the water inlet of the water-cooling plate and the circulating water pool is a DN200 seamless pipe.

5. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The diversion pipe is a DN200 seamless pipe.

6. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The water in the circulating water pool is soft water.

7. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The circulating water pool is provided with a liquid level monitoring device and an electric water supply valve connected to the PLC control cabinet. After the liquid level monitoring device transmits the liquid level signal to the PLC control cabinet, the PLC control cabinet automatically controls the switch of the electric water supply valve and automatically adjusts the amount of water to be supplied according to the required liquid level.

8. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The liquid level is set as follows: the water replenishment level is 2.8m and the water stop level is 3.5m.

9. The furnace front water cooling plate cooling system according to claim 1, characterized in that: The brine in the slag treatment brine pool flows to the slag flushing ditch through the brine pump for use in slag flushing.

Images