Phosphogypsum drying energy-saving equipment with waste heat recovery function

Abstract

The utility model provides a kind of phosphogypsum drying energy-saving equipment with waste heat recovery function, including drying equipment ontology and water tank, the bend pipe is installed through at drying equipment ontology smoke outlet, the bend pipe one end is installed through with smoke pipe, the smoke pipe inside is fixed with serpentine heat exchange tube, the water tank top surface is equipped with circulating pump.The utility model this equipment is set bend pipe, smoke pipe and inside serpentine heat exchange tube at drying equipment ontology smoke outlet, and cooperate water tank and circulating pump form circulation system.200 ℃-300 ℃ high-temperature tail gas generated in drying process passes through smoke pipe, heat can be fully absorbed by circulating water in serpentine heat exchange tube, avoid the waste of a large amount of heat energy.Previously untreated direct discharge tail gas heat energy is recycled, reduce the fuel or electric energy consumption needed to maintain drying temperature, effectively reduce equipment operating cost, realize energy saving and efficiency increase.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, and in particular to an energy-saving phosphogypsum drying equipment with waste heat recovery function. Background Technology

[0002] In modern industrial production, phosphogypsum, as a major waste product of the phosphate fertilizer and phosphoric acid industries, is produced in enormous quantities annually. These mountains of phosphogypsum not only occupy vast amounts of valuable land resources but also, due to their content of various harmful substances, cause serious pollution to the soil, water bodies, and atmosphere through rainwater infiltration and dust dispersion, becoming a key challenge restricting the green development of the industry. Drying phosphogypsum is an important prerequisite for its comprehensive utilization in building materials, chemical raw materials, and other fields; however, existing drying equipment has many problems that urgently need to be solved. Existing phosphogypsum drying equipment has significant shortcomings in heat utilization. The high-temperature exhaust gases generated during the drying process typically reach 200℃-300℃, but these gases, containing a large amount of heat energy, are often directly released into the atmosphere without any treatment. This not only results in a substantial waste of heat—equivalent to hundreds of megajoules of energy being lost for every ton of phosphogypsum processed—but also forces the equipment to consume more fuel or electricity to maintain the required drying temperature, significantly increasing operating costs. For example, a medium-sized phosphate fertilizer enterprise incurs several million yuan in increased costs annually solely due to the waste of heat from exhaust gases.

[0003] Therefore, it is necessary to provide an energy-saving phosphogypsum drying equipment with waste heat recovery function to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides an energy-saving phosphogypsum drying device with waste heat recovery function, which solves the problems in the background technology.

[0005] To address the aforementioned technical problems, this utility model provides an energy-saving phosphogypsum drying device with waste heat recovery function, the core of which consists of a drying equipment body and a water tank. A bent pipe is installed through the exhaust port of the drying equipment body, and an exhaust pipe is installed at one end of the bent pipe, forming a tail gas conveying channel to allow the high-temperature tail gas generated during drying to be discharged in an orderly manner. A serpentine heat exchange tube is fixedly installed inside the exhaust pipe, serving as a key component for heat exchange, and fully contacts the tail gas to absorb heat. A circulation pump is installed on the top surface of the water tank. The input end of the circulation pump is connected to the water tank through a water pipe to draw water from the tank; the output end is connected to one end of the serpentine heat exchange tube through an outlet pipe, allowing water to flow into the serpentine heat exchange tube; the other end of the serpentine heat exchange tube is connected to the water tank through an inlet pipe, forming a complete water circulation loop. During operation, the circulating pump drives water to flow in the loop. The water exchanges heat with the high-temperature exhaust gas in the serpentine heat exchange tube. After absorbing the heat from the exhaust gas, the water temperature rises and then flows back to the water tank for storage, thus realizing the recovery and utilization of the waste heat of the exhaust gas. Preferably, a drain outlet is installed through the bottom surface of the bend, and a sealing cap is fitted onto the drain outlet. During equipment operation, impurities and particulate matter in the exhaust gas may accumulate at the bend. When the sealing cap is closed, exhaust gas leakage can be prevented. When it is necessary to clean impurities inside the bend and ensure smooth airflow, the sealing cap can be opened to perform the draining operation, ensuring stable equipment operation. Preferably, the serpentine heat exchange tube runs through the entire interior of the exhaust pipe. This layout design increases the contact area and contact time between the serpentine heat exchange tube and the high-temperature exhaust gas, enabling the circulating water to absorb the heat from the exhaust gas more fully, improving the waste heat recovery efficiency, and further enhancing the energy-saving effect of the equipment. Preferably, a thermometer is installed inside the water tank to monitor the temperature of the circulating water in the tank in real time. By reading the thermometer reading, operators can intuitively understand the effect of waste heat recovery, adjust the equipment operating parameters in a timely manner, and ensure that the equipment is in optimal working condition. Preferably, the water tank is provided with an inlet and a drain pipe, and a valve is installed on the drain pipe. The inlet is used to replenish the water lost due to evaporation, use, etc., and to maintain a stable water level in the tank; when hot water is needed, the drain pipe can be opened to discharge hot water, realizing the rational use of hot water, and also facilitating maintenance operations such as cleaning the water tank. Preferably, a controller is installed on the outer surface of the drying equipment body, which serves as the control center of the equipment and enables intelligent control and management of equipment components such as the circulating pump. Through the controller, the operating status of the circulating pump can be adjusted, the water tank temperature range can be set, etc., ensuring the coordinated and stable operation of the entire waste heat recovery system and the drying equipment, thereby improving the automation level and reliability of the equipment operation.

[0006] Compared with related technologies, the energy-saving phosphogypsum drying equipment with waste heat recovery function provided by this utility model has the following beneficial effects: Compared to existing technologies, this equipment utilizes a curved pipe, an exhaust pipe, and an internal serpentine heat exchanger tube at the exhaust port of the drying unit, forming a circulation system with a water tank and a circulating pump. During the drying process, the 200℃-300℃ high-temperature exhaust gas passes through the exhaust pipe, and the heat is fully absorbed by the circulating water within the serpentine heat exchanger tube, preventing significant waste of thermal energy. The thermal energy of the exhaust gas, previously emitted directly without treatment, is now recovered and utilized, reducing the fuel or electricity consumption required to maintain the drying temperature, effectively lowering equipment operating costs, and achieving energy conservation and efficiency.

[0007] Compared to existing technologies, the drain outlet and its matching sealing cap installed through the bottom surface of the bend provide a convenient way for the equipment to drain and clean. During the drying process of phosphogypsum, some impurities and particulate matter that may be carried in the exhaust gas will accumulate at the bend. By opening the sealing cap, the deposits at the drain outlet can be cleaned in time, preventing impurities from clogging the pipes, ensuring smooth airflow inside the equipment, and thus ensuring the stable operation of the drying equipment and waste heat recovery system, extending the service life of the equipment.

[0008] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0009] Figure 1 A schematic diagram of the structure of an energy-saving phosphogypsum drying device with waste heat recovery function provided by this utility model; Figure 2 A schematic diagram of the bent pipe structure of a phosphogypsum drying energy-saving device with waste heat recovery function provided by this utility model; Figure 3 A schematic diagram of the exhaust pipe structure of an energy-saving phosphogypsum drying device with waste heat recovery function provided by this utility model; Figure 4 A schematic diagram of a serpentine heat exchanger structure for a phosphogypsum drying energy-saving device with waste heat recovery function provided by this utility model.

[0010] Numbering on the map: 1. Drying equipment body; 2. Controller; 3. Bend; 4. Exhaust pipe; 5. Water outlet pipe; 6. Circulation pump; 7. Thermometer; 8. Water tank; 9. Drain pipe; 10. Water inlet pipe; 11. Sewage outlet; 12. Sealing cover; 13. Serpentine heat exchange tube. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Example 1 Please refer to the following: Figure 1-4An energy-saving phosphogypsum drying device with waste heat recovery function is constructed with the drying device body 1 and water tank 8 as the core components. For physical connection, a bend 3 is installed at the exhaust port of the drying device body 1 using welding or flange connection to ensure a tight connection, prevent exhaust gas leakage, and provide an initial channel for exhaust gas discharge. One end of the bend 3 is also connected to an exhaust pipe 4 via welding or flange connection, forming a stable and sealed exhaust gas transport channel. Inside the exhaust pipe 4, the serpentine heat exchange tube 13 is fixed by welding, bolting, or clamping, running through the entire exhaust pipe 4. This installation logic is to maximize the contact area and contact time between the serpentine heat exchange tube 13 and the high-temperature exhaust gas, thereby improving heat exchange efficiency. The circulation pump 6 is installed on the top surface of the water tank 8 using bolts or welding. The input end of the circulation pump 6 is connected to the water tank 8 via a water pipe. The connection between the water pipe and the water tank 8 and the circulation pump 6 can be achieved using threaded connections, compression fittings, or quick-connect fittings to ensure a sealed water circuit. The output end is connected to one end of the serpentine heat exchange tube 13 via an outlet pipe 5, with the connection method also ensuring a tight seal. The other end of the serpentine heat exchange tube 13 is connected to the water tank 8 via an inlet pipe 10, thus forming a complete and sealed water circulation loop. Each component has a clearly defined function in the overall structure. The drying equipment body 1 is used for drying phosphogypsum, generating high-temperature exhaust gas; the bend pipe 3 and the exhaust pipe 4 are responsible for transporting the exhaust gas; the serpentine heat exchange tube 13, as the core component for heat exchange, exchanges heat with the exhaust gas under the drive of the circulating pump 6, transferring the heat from the exhaust gas to the circulating water; the water tank 8 is used to store the circulating water and provide a water source for the entire circulation system. During operation, the circulating pump 6 drives the water to circulate in the loop. After absorbing heat from the exhaust gas in the serpentine heat exchange tube 13, the water temperature rises and then flows back to the water tank 8 for storage, realizing the recovery and utilization of waste heat from the exhaust gas, effectively reducing the energy consumption of the drying equipment, and achieving energy-saving technical effects.

[0013] Example 2 Please refer to the following: Figure 1-4 The bottom surface of the bend 3 is connected by welding or threaded connection to install a drain port 11. A sealing cap 12 is fitted onto the drain port 11, and the sealing cap 12 and the drain port 11 can be fitted by threaded engagement, snap-fit, or flange sealing. During equipment operation, impurities and particulate matter carried in the exhaust gas tend to deposit at the bottom of the bend 3 under gravity. When the sealing cap 12 is closed, the sealing structure prevents exhaust gas leakage. When it is necessary to clean impurities inside the bend 3 and ensure smooth airflow, the sealing cap 12 can be opened for draining. This structural fit ensures that impurities can be cleaned in a timely manner during equipment operation, maintaining the smooth flow of exhaust gas, ensuring stable equipment operation, extending equipment service life, and thus ensuring the efficient operation of the waste heat recovery system.

[0014] Example 3 Please refer to the following: Figure 1-4 The serpentine heat exchange tube 13 is designed to penetrate the entire interior of the exhaust pipe, allowing it to form a large-area and long-term contact with the high-temperature exhaust gas. The installation angle and curvature of the serpentine heat exchange tube 13 are optimized to ensure that the exhaust gas can fully wash the surface of the serpentine heat exchange tube 13 as it flows within the exhaust pipe 4, improving heat transfer efficiency. Mechanically, an appropriate gap is maintained between the serpentine heat exchange tube 13 and the inner wall of the exhaust pipe 4, ensuring both smooth exhaust gas flow and the stability of the heat exchange tube. Through this installation method and fit, the circulating water can more fully absorb the heat from the exhaust gas, significantly improving waste heat recovery efficiency compared to ordinary heat exchange tube layouts, further enhancing the energy-saving effect of the equipment, reducing energy waste, and lowering enterprise operating costs.

[0015] Example 4 Please refer to the following: Figure 1-4 The thermometer 7 installed inside the water tank 8 is fixed to the wall of the water tank 8 by means of threaded connection, compression fitting, or embedded installation. Its temperature sensing probe is inserted into the water inside the water tank 8 to ensure accurate water temperature measurement. The thermometer 7 is connected to an external display device or controller 2 via wires to transmit the real-time monitored circulating water temperature data in the water tank 8 to the operator or control system. By reading the thermometer 7, the operator can intuitively understand the effect of waste heat recovery. If the water temperature does not reach the expected level or abnormal fluctuations occur, the operator can adjust the operating power of the circulating pump 6, the temperature of the drying equipment, and other operating parameters in a timely manner to ensure that the equipment is in the optimal working state, achieve precise control of the waste heat recovery process, and improve the stability and reliability of equipment operation.

[0016] Example 5 Please refer to the following: Figure 1-4 The water tank 8 has an inlet and a drain pipe 9 connected to its main body via welding, threaded connection, or flange connection. The valve installed on the drain pipe 9 can be a ball valve, gate valve, or butterfly valve, and is fixed to the drain pipe 9 via threaded connection, flange connection, or welding. The inlet replenishes water lost due to evaporation and usage, maintaining a stable water level in the water tank 8 and ensuring a sufficient water source for the circulation system. When hot water is needed, the valve on the drain pipe 9 is opened to discharge the hot water that has absorbed heat from the water tank 8, allowing for the efficient use of hot water, such as for other heating processes in the factory or for domestic hot water supply. Simultaneously, the drain pipe 9 facilitates cleaning and maintenance of the water tank 8, removing impurities and scale, ensuring the cleanliness of the water tank 8 and the circulation system, and improving the equipment's lifespan and operating efficiency.

[0017] Example 6 Please refer to the following: Figure 1-4The controller 2 is installed on the outer surface of the drying equipment body 1 using bolts, clips, or adhesive. The controller 2 is connected to components such as the circulating pump 6 and thermometer 7 via wires, achieving electrical connection and signal transmission. As the control center of the equipment, the controller 2 integrates a control chip and related circuits, enabling intelligent control and management of components such as the circulating pump 6. Through the controller 2, operators can preset parameters such as the temperature range of the water tank 8, the working mode of the circulating pump 6, and the running time. During equipment operation, the controller 2 automatically adjusts the working state of the circulating pump 6 based on the water temperature data fed back by the thermometer 7, such as adjusting the speed of the circulating pump 6 to control the water circulation flow rate, thereby adjusting the efficiency of waste heat recovery. Simultaneously, the controller 2 can coordinate the working rhythm of the drying equipment and the waste heat recovery system, ensuring the coordinated and stable operation of the entire system, improving the automation and reliability of equipment operation, reducing manual intervention, and increasing production efficiency.

[0018] It should be noted that the control circuit of controller 2 can be implemented by those skilled in the art through simple programming, and is common knowledge in the field. It is only used and not modified, so the control method and circuit connection will not be described in detail.

[0019] The working principle of the energy-saving phosphogypsum drying equipment with waste heat recovery function provided by this utility model is as follows: When phosphogypsum is dried inside the drying equipment body 1, the high-temperature exhaust gas (approximately 200℃ - 300℃) generated during the drying process is discharged from the exhaust port of the drying equipment body 1 and enters the bend pipe 3, which is connected to it. After flowing inside the bend pipe 3, the exhaust gas enters the exhaust pipe 4 through the other end of the bend pipe 3. Inside the exhaust pipe 4, the serpentine heat exchange tube 13, which runs through the entire exhaust pipe 4, plays a key role.

[0020] The water stored in water tank 8 begins to circulate under the action of circulating pump 6. The input end of circulating pump 6 is connected to water tank 8 through a water pipe, drawing water from water tank 8. After being pressurized by circulating pump 6, the water is transported to one end of serpentine heat exchange tube 13 through outlet pipe 5. During the flow of water in serpentine heat exchange tube 13, it fully exchanges heat with the high-temperature exhaust gas in flue pipe 4, absorbing a large amount of heat energy from the exhaust gas, causing the water temperature to rise continuously. The hot water that has absorbed heat flows out from the other end of serpentine heat exchange tube 13 and returns to water tank 8 for storage through inlet pipe 10. The inlet on water tank 8 can be used to replenish water lost due to evaporation or other reasons, ensuring a stable water level in water tank 8. The thermometer 7 installed inside water tank 8 can monitor the water temperature in real time, allowing operators to easily monitor the effectiveness of waste heat recovery and the water temperature within water tank 8. When hot water is needed, it can be discharged through drain pipe 9, and the valve installed on drain pipe 9 is used to control the discharge of hot water. Furthermore, during equipment operation, impurities and particulate matter that may be carried in the exhaust gas may accumulate at the bend 3. At this time, the sealing cover 12 of the drain port 11 at the bottom of the bend 3 can be opened to clean the drain port 11 and prevent impurities from affecting the normal operation of the equipment. The controller 2 installed on the outer surface of the drying equipment body 1 can intelligently control and manage equipment components such as the circulating pump 6, ensuring that the entire waste heat recovery system and the drying equipment operate in a coordinated and stable manner, achieving high efficiency, energy saving and stable operation in the phosphogypsum drying process.

[0021] It should be noted that all components used in this application are standard parts that can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets and welding that are mature in the prior art. The mechanical parts and electrical equipment adopt conventional models in the prior art. The circuit connection adopts conventional connection methods in the prior art. The electrical equipment is connected to an external safe power source. These will not be described in detail here.

[0022] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An energy-saving drying device for phosphogypsum with waste heat recovery function, comprising a drying device body (1) and a water tank (8), characterized in that, A bent pipe (3) is installed through the exhaust port of the drying equipment body (1). An exhaust pipe (4) is installed through one end of the bent pipe (3). A serpentine heat exchange tube (13) is fixed inside the exhaust pipe (4). A circulation pump (6) is installed on the top surface of the water tank (8). The input end of the circulation pump (6) is connected to the water tank (8) through a water pipe. The output end of the circulation pump (6) is connected to one end of the serpentine heat exchange tube (13) through a water outlet pipe (5). The other end of the serpentine heat exchange tube (13) is connected to the water tank (8) through a water inlet pipe (10).

2. The energy-saving phosphogypsum drying equipment with waste heat recovery function according to claim 1, characterized in that, The bottom surface of the bend (3) is provided with a drain outlet (11), and a sealing cap (12) is fitted on the drain outlet (11).

3. The energy-saving phosphogypsum drying equipment with waste heat recovery function according to claim 1, characterized in that, The serpentine heat exchange tube (13) runs through the entire interior of the exhaust pipe.

4. The energy-saving phosphogypsum drying equipment with waste heat recovery function according to claim 1, characterized in that, A thermometer (7) is installed inside the water tank (8).

5. The energy-saving phosphogypsum drying equipment with waste heat recovery function according to claim 1, characterized in that, The water tank (8) is provided with an inlet and a drain pipe (9), and a valve is installed on the drain pipe (9).

6. The energy-saving phosphogypsum drying equipment with waste heat recovery function according to claim 1, characterized in that, A controller (2) is installed on the outer surface of the drying equipment body (1).

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