Waste residue and waste heat recycling equipment in yellow phosphorus production

Abstract

The utility model discloses waste residue waste heat recycling equipment in yellow phosphorus production, which comprises a control panel, a residue pool, a steam suction pump, a first heat exchange device and a second heat exchange device, the residue pool is arranged on one side of an electric furnace, the first heat exchange device comprises a heat exchange tank, an air blowing pump and a first heat exchange group, the heat exchange tank is arranged on one side of the residue pool, and the air blowing pump is arranged on the other side of the residue pool. The second heat exchange device is located on one side of the first heat exchange device and comprises a heat exchange pool and a second heat exchange set. According to the device, the control panel, the slag pool, the steam suction pump, the first heat exchange device and the second heat exchange device are combined for use, so that heat generated by quenching the yellow phosphorus waste slag can be recycled, and energy waste is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of yellow phosphorus production and processing technology, specifically to a waste heat recovery and utilization device for yellow phosphorus production. Background Technology

[0002] The yellow phosphorus industry suffers from high energy consumption, high emissions of waste gas, wastewater, and solid waste, and poor economic efficiency. Among the three wastes from yellow phosphorus, the largest solid waste is yellow phosphorus slag. On average, 10 tons of slag are generated for every ton of yellow phosphorus produced, and the slag discharge temperature is extremely high, reaching an average temperature of 1400℃ after exiting the furnace.

[0003] Currently, there are generally two methods for treating yellow phosphorus waste residue. One method involves quenching the molten phosphorus waste residue (temperatures as high as 1350–1550℃) with a large amount of cold water, then transporting it away by truck for secondary processing. However, during cooling, the waste residue generates a mixture of water vapor and acidic gases, as well as wastewater, which can have a significant impact on the environment when discharged. The other method involves companies directly discharging dry residue, allowing the high-temperature molten waste residue to flow directly into a dry residue yard. After the temperature drops, workers shovel and transport the dry residue away. This method does not consume water or cause secondary pollution or corrosive vapors. However, the high-temperature molten waste residue (around 1300℃) flowing in the production workshop is extremely dangerous, and a large amount of heat is also lost and wasted. Summary of the Invention

[0004] To address the aforementioned issues, this utility model provides a waste heat recovery and utilization device for yellow phosphorus production that has minimal environmental impact, poses no safety hazards, and effectively utilizes the heat from waste residue.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a waste heat recovery and utilization device for yellow phosphorus production, comprising a control panel, a slag pool, a steam suction pump, a first heat exchange device, and a second heat exchange device. The slag pool is located on one side of the electric furnace and is connected to the slag discharge pipe of the electric furnace through a pipeline. A sealing cover is installed above the top surface of the slag pool. The steam suction pump is located on one side of the slag pool, and its suction end is connected to the sealing cover on the slag pool through a suction pipe and a demister. A discharge pipe is installed on the discharge end.

[0006] The first heat exchange device includes a heat exchange tank, an air pump, and a first heat exchange group. The heat exchange tank is located on one side of the slag pool. An air inlet is installed in the middle of the heat exchange tank, and an exhaust port is installed at the top. A hot air pipe is installed on the exhaust port, and the two are connected by a pressure valve. An insulation layer is installed on the body of the hot air pipe, and its opening extends into the corresponding equipment for drying and preheating treatment. The air pump is installed on the tank body of the heat exchange tank by a mounting bracket. The air port of the air pump is connected to the air inlet of the heat exchange tank through an air pipe. The first heat exchange group is set inside the heat exchange tank and connected to its inner wall. The first heat exchange group is composed of multiple spiral heat exchange tubes connected together to form a whole. The inlet and outlet of the first heat exchange group extend outside the heat exchange tank, and the inlet is connected to the drain outlet of the slag pool through a pipe.

[0007] The second heat exchange device is located on one side of the first heat exchange device. The second heat exchange device includes a heat exchange pool and a second heat exchange group. A temperature sensor is installed inside the heat exchange pool, and a cover plate is provided on the top surface. The cover plate has an inspection port and an air port. The water inlet pipe of the heat exchange pool is connected to an external water supply pipe. A drain pipe is installed on the side opposite to the water inlet pipe to transport water to the corresponding workshop. An electric valve is installed on the drain pipe. The second heat exchange group is installed inside the heat exchange pool. The second heat exchange group consists of multiple equidistantly arranged disc heat exchange tubes. Each adjacent heat exchange disc tube is connected to form a whole. The inlet and outlet of the second heat exchange group extend outside the heat exchange pool. The inlet is connected to the outlet of the first heat exchange group through a pipe. A drain pipe is installed on the outlet.

[0008] The control panel is located on one side of the slag pool in an easily accessible position. The electrical control components in this equipment are connected to the control panel via wires.

[0009] As an optimization solution for this case, in order to improve the utilization rate of quenching slag water and reduce water waste, a circulation device is provided on one side of the heat exchange pool.

[0010] Furthermore, the circulation device includes a sedimentation tank and a cooling tower. The sedimentation tank is divided into three equal-sized chambers by two partitions: a primary sedimentation chamber, a secondary sedimentation chamber, and a tertiary sedimentation chamber. The inlet of the primary sedimentation chamber is connected to the sewage pipe of the second heat exchange unit. A downward-sloping guide plate is installed on the tank wall below the outlet. Multiple overflow holes are equidistantly opened on the upper part of the end face of the partition between the primary and secondary sedimentation chambers. A primary filter screen is installed in the overflow hole. The partition between the secondary and tertiary sedimentation chambers also has multiple overflow holes, and a secondary filter screen is installed in the hole. The size of the secondary filter screen is smaller than that of the primary filter screen. The cooling tower is located on one side of the sedimentation tank. The upper part of the tower body has a water inlet and is connected to the middle of the tertiary sedimentation chamber through a water pump and a water suction pipe. The bottom of the tower body has a drain pipe, and the outlet of the drain pipe is connected to the water inlet of the sludge tank.

[0011] Furthermore, a cold air blower is installed on the top surface of the cooling tower, and the air blowing pipe of the cold air blower extends vertically from the upper part of the cooling tower into the middle and lower part of the tower, and a horn-shaped nozzle is installed on the air outlet of the air blowing pipe.

[0012] As an optimization of the case handling process, in order to further improve the utilization rate of waste heat, a third heat exchange group is also provided in the heat exchange area. The third heat exchange group is a U-shaped finned heat exchange tube. Its inlet is connected to the discharge pipe of the steam suction pump through an insulation pipe, and its outlet is connected to the water inlet pipe of the first-stage settling chamber.

[0013] Beneficial effects: This utility model, by combining a control panel, slag pool, steam suction pump, first heat exchange device, and second heat exchange device, can recover and utilize the heat generated by quenching yellow phosphorus waste slag, effectively reducing energy waste. Furthermore, this utility model uses two media for waste heat recovery. The first heat exchange device uses air and wastewater for heat exchange, turning the cooling gas into high-temperature air before it is delivered to the corresponding equipment for drying and preheating treatment. The second heat exchange device uses cold water and wastewater for secondary heat exchange, turning the cold water into heated water before it is delivered to the living area or workshops with hot water needs, greatly improving the utilization efficiency of waste slag heat. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention in Embodiment 1.

[0015] Figure 2 for Figure 1 A schematic diagram of the structure of the first and second heat exchangers.

[0016] Figure 3 This is a schematic diagram of the structure of the present invention in Embodiment 2.

[0017] Figure 4 for Figure 3 A schematic diagram of the structure of the second heat exchanger.

[0018] Figure 5 for Figure 3 A schematic diagram of the intermediate circulation device.

[0019] In the diagram: 1. Control panel; 2. Slag tank; 3. Steam suction pump; 4. Sealing cover; 5. Demister; 6. Heat exchange tank; 7. Air pump; 8. Heat exchange group 1; 9. Heat exchange pool; 10. Heat exchange group 2; 11. Temperature sensor; 12. Settling tank; 13. Cooling tower; 14. Primary settling chamber; 15. Secondary settling chamber; 16. Tertiary settling chamber; 17. Baffle plate; 18. Air cooler; 19. Heat exchange group 3. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the accompanying drawings are all in a very simplified form, using non-precise ratios, and are only used to facilitate and clearly illustrate the purpose of the embodiments of this utility model. Example 1

[0022] like Figure 1-2 As shown in the figure, this embodiment discloses a waste heat recovery and utilization device for yellow phosphorus production, which is used to recover and utilize the heat generated by quenching yellow phosphorus waste slag. Specifically, it includes a control panel 1, a slag pool 2, a steam suction pump 3, a first heat exchange device, and a second heat exchange device.

[0023] See Figure 1 The slag pool 2 is located on one side of the electric furnace and is connected to the slag discharge pipe of the electric furnace through a pipe. A sealing cover 4 is installed above the top surface of the slag pool 2. The steam suction pump 3 is located on one side of the slag pool 2. Its suction end is connected to the sealing cover 4 on the slag pool 2 through a suction pipe and a demister 5. A discharge pipe is installed on the discharge end.

[0024] See Figure 1 and Figure 2 The first heat exchange device includes a heat exchange tank 6, an air pump 7, and a first heat exchange group 8. The heat exchange tank 6 is located on one side of the slag pool 2. An air inlet is installed in the middle of the heat exchange tank 6, and an exhaust port is installed at the top. A hot air pipe is installed on the exhaust port, and the two are connected by a pressure valve. An insulation layer is installed on the pipe body, and its pipe end extends to the corresponding equipment or workshop for drying and preheating treatment. The air pump 7 is installed on the tank body of the heat exchange tank 6 by a mounting bracket. The air port of the air pump 7 is connected to the air inlet of the heat exchange tank 6 through an air pipe. The first heat exchange group 8 is set inside the heat exchange tank 6 and connected to its inner wall. The first heat exchange group 8 is composed of multiple spiral heat exchange tubes connected to form a whole. The inlet and outlet of the first heat exchange group 8 extend outside the heat exchange tank 6, and the inlet is connected to the drain outlet of the slag pool 2 through a pipe.

[0025] The second heat exchange device is located on one side of the first heat exchange device. The second heat exchange device includes a heat exchange pool 9 and a second heat exchange group 10. A temperature sensor 11 is installed inside the heat exchange pool 9. A cover plate is provided on the top surface. The cover plate is provided with an inspection port and an air port. The water inlet pipe of the heat exchange pool 9 is connected to an external water supply pipe. A drain pipe is installed on the side opposite to the water inlet pipe to transport water to the corresponding workshop. An electric valve is installed on the drain pipe. The second heat exchange group 10 is installed inside the heat exchange pool 9. The second heat exchange group 10 consists of multiple disc heat exchange tubes arranged at equal intervals. Each adjacent heat exchange disc tube is connected to form a whole. The inlet and outlet of the second heat exchange group 10 extend outside the heat exchange pool 9. The inlet is connected to the outlet of the first heat exchange group 8 through a pipe. A drain pipe is installed on the outlet.

[0026] The control panel 1 is located on one side of the slag tank 2 in a convenient position for operation. The electrical control components in this equipment are connected to the control panel 1 via wires. Example 2

[0027] like Figure 3-5 As shown, the specific structure and implementation method are as illustrated in Example 1, with the difference being that, see [link to example]. Figure 3 A circulation device is provided on one side of the heat exchange pool 9.

[0028] from Figure 3 and Figure 5 As can be seen, the circulation device includes a settling tank 12 and a cooling tower 13. The settling tank 12 is divided into three equal-sized chambers by two baffles: a primary settling chamber 14, a secondary settling chamber 15, and a tertiary settling chamber 16. The inlet of the water inlet pipe of the primary settling chamber 14 is connected to the sewage pipe of the second heat exchange group 10. A downwardly inclined guide plate 17 is installed on the tank wall below the outlet. The upper part of the end face of the baffle between the primary settling chamber 14 and the secondary settling chamber 15, etc. Multiple overflow holes are provided in the settling tank 12, and a primary filter screen is installed in each overflow hole. The partition between the secondary settling chamber 15 and the tertiary settling chamber 16 is also provided with multiple overflow holes, and a secondary filter screen is installed in each hole. The size of the mesh of the secondary filter screen is smaller than that of the primary filter screen. The cooling tower 13 is located on one side of the settling tank 12. The upper part of the tower body has a water inlet and is connected to the middle of the tertiary settling chamber 16 through a water pump and a water pipe. The bottom of the tower body is connected to a drain pipe, and the outlet of the drain pipe is connected to the water inlet of the slag tank 2.

[0029] See Figure 3 and Figure 5 A cooling fan 18 is installed on the top surface of the cooling tower 13. The air blowing pipe of the cooling fan 18 extends vertically from the upper part of the cooling tower 13 into the middle and lower part of the tower, and a horn-shaped air nozzle is installed on the air outlet of the air blowing pipe.

[0030] See Figure 3 and Figure 4The heat exchange area is also equipped with a third heat exchange group 19, which is a U-shaped finned heat exchange tube. Its inlet is connected to the discharge pipe of the steam suction pump 3 through an insulation pipe, and its outlet is connected to the water inlet pipe of the first-stage settling chamber 14.

[0031] During operation, the waste residue is transported from the electric furnace to the slag pool 2 to come into contact with cooling water for cooling, and the cooling water is heated to high temperature. After the waste residue is quenched, the high temperature water is discharged into the No. 1 heat exchange group 8, and the air pump 7 is turned on to blow air to cool the coil of the No. 1 heat exchange group 8. The air absorbs heat from the surface of the No. 1 heat exchange group 8 and becomes high temperature gas. After the gas is heated in the heat exchange tank 6 for a certain period of time, it begins to expand into hot air. At this time, the hot air floating in the air pushes open the pressure valve at the top of the heat exchange tank 6 and is transported to the corresponding equipment or workshop for drying and preheating treatment. After the heated air reaches the standard, it is discharged, the pressure valve is reset and closed, and the air continues to be heated in the heat exchange tank 6.

[0032] After releasing partial heat in heat exchange tank 6, the high-temperature wastewater enters the second heat exchange group 10 of heat exchange pool 9 to dissipate heat and heat the water source in heat exchange pool 9. At the same time, steam suction pump 3 draws the high-temperature steam generated by quenching water into the third heat exchange group 19 to heat the cold water in heat exchange pool 9 together. Temperature sensor monitors the water temperature in heat exchange pool 9 in real time. After reaching the preset value, the solenoid valve is opened and the water is delivered to the living area or workshops with hot water demand.

[0033] The water droplets formed by the condensation of the high-temperature steam heat after absorption, along with the wastewater after most of the heat has been absorbed, enter the sedimentation chambers of the sedimentation tank 12 for residue sedimentation. After sedimentation, the wastewater is pumped into the cooling tower 13 and cooled by the air cooler 18 before flowing back to the slag tank 2 for the next quenching.

[0034] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. Waste heat recovery and utilization equipment for yellow phosphorus production, comprising a control panel (1), a slag pool (2), a steam suction pump (3), a first heat exchange device, and a second heat exchange device, characterized in that: The slag pool (2) is located on one side of the electric furnace and is connected to the slag discharge pipe of the electric furnace through a pipe. A sealing cover (4) is installed above the top surface of the slag pool (2). The steam suction pump (3) is located on one side of the slag pool (2). Its suction end is connected to the sealing cover (4) on the slag pool (2) through a suction pipe and a demister (5). A discharge pipe is installed on the discharge end. The first heat exchange device includes a heat exchange tank (6), an air pump (7), and a first heat exchange group (8). The heat exchange tank (6) is located on one side of the slag pool (2). An air inlet is installed in the middle of the heat exchange tank (6), and an exhaust port is installed at the top. A hot air pipe is installed on the exhaust port. The two are connected by a pressure valve. An insulation layer is installed on the pipe body of the hot air pipe. Its pipe opening extends to the corresponding equipment or workshop for drying and preheating treatment. The air pump (7) is installed on the tank body of the heat exchange tank (6) by a mounting bracket. The air port of the air pump (7) is connected to the air inlet of the heat exchange tank (6) through an air pipe. The first heat exchange group (8) is set inside the heat exchange tank (6) and connected to its inner wall. The first heat exchange group (8) is composed of multiple spiral heat exchange pipes connected to form a whole. The inlet and outlet of the first heat exchange group (8) extend out of the heat exchange tank (6). The inlet is connected to the drain outlet of the slag pool (2) through a pipe. The second heat exchange device is located on one side of the first heat exchange device. The second heat exchange device includes a heat exchange pool (9) and a second heat exchange group (10). A temperature sensor (11) is installed in the heat exchange pool (9). A cover plate is provided on the top surface. An inspection port and an air port are provided on the cover plate. The water inlet pipe of the heat exchange pool (9) is connected to an external water supply pipe. A drain pipe is installed on the side opposite to the water inlet pipe to transport water to the corresponding workshop. An electric valve is installed on the drain pipe. The second heat exchange group (10) is installed in the heat exchange pool (9). The second heat exchange group (10) consists of multiple disc heat exchange tubes arranged at equal intervals. Each adjacent heat exchange disc tube is connected to form a whole. The inlet and outlet of the second heat exchange group (10) extend out of the heat exchange pool (9). The inlet is connected through the outlet of the first heat exchange group (8). A sewage pipe is installed on the outlet. The control panel (1) is located on one side of the slag tank (2) in a convenient position for operation. The electrical control components in this device are connected to the control panel (1) via wires.

2. The waste heat recovery and utilization equipment for yellow phosphorus production according to claim 1, characterized in that: A circulation device is provided on one side of the heat exchange pool (9).

3. The waste heat recovery and utilization equipment for yellow phosphorus production according to claim 2, characterized in that: The circulation device includes a settling tank (12) and a cooling tower (13). The settling tank (12) is divided into three equal-sized chambers by two partitions: a primary settling chamber (14), a secondary settling chamber (15), and a tertiary settling chamber (16). The inlet of the primary settling chamber (14) is connected to the drain pipe of the second heat exchange group (10). A downwardly inclined guide plate (17) is installed on the tank wall below the outlet. The partition between the primary settling chamber (14) and the secondary settling chamber (15) is connected to the tertiary settling chamber (16). Multiple overflow holes are equidistantly arranged in the part, and a primary filter screen is installed in the overflow hole. The partition between the secondary settling chamber (15) and the tertiary settling chamber (16) is also provided with multiple overflow holes, and a secondary filter screen is installed in the hole. The size of the mesh is smaller than that of the primary filter screen. The cooling tower (13) is located on one side of the settling tank (12). The upper part of the tower body is provided with a water inlet and is connected to the middle of the tertiary settling chamber (16) through a water pump and a water pipe. The bottom of the tower body is connected by a drain pipe, and the outlet of the drain pipe is connected to the water inlet of the slag tank (2).

4. The waste heat recovery and utilization equipment for yellow phosphorus production according to claim 3, characterized in that: A cooling fan (18) is installed on the top surface of the cooling tower (13). The air blowing pipe of the cooling fan (18) is vertically inserted from the upper part of the cooling tower (13) into the middle and lower part of the tower. A horn-shaped air nozzle is installed on the air outlet of the air blowing pipe.

5. The waste heat recovery and utilization equipment for yellow phosphorus production according to claim 2, characterized in that: The heat exchange pool (9) is also equipped with a third heat exchange group (19), which is a U-shaped finned heat exchange tube. Its inlet is connected to the discharge pipe of the steam suction pump (3) through an insulation pipe, and its outlet is connected to the water inlet pipe of the first-stage settling chamber (14).

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