A reverse osmosis raw water preheating device for steam turbine water injection tank overflow waste heat recovery

Abstract

The present application relates to the technical field of steam turbine waste heat recovery and water treatment, and discloses a reverse osmosis raw water preheating device for overflow waste heat recovery of a steam turbine water injection tank, which comprises a water injection tank, a water injection air extractor, a cooling tower circulating pool, a reverse osmosis water making device, a raw water pool and a control unit, the water injection tank is a supporting water storage device of the water injection air extractor, the side wall of the water injection tank is provided with a low overflow port and a high overflow port for realizing overflow drainage under different working conditions, a temperature sensor is arranged on the water injection tank, and a water supplement pipeline is connected to the top of the water injection tank. The present application recovers the waste heat of the overflow hot water of the water injection tank to the raw water pool, preheats the reverse osmosis raw water, avoids waste of waste heat, reduces the preheating energy consumption of the reverse osmosis system due to low raw water temperature, increases the raw water temperature, improves the reverse osmosis membrane permeation efficiency, and significantly saves annual electricity or steam costs.

Description

Technical Field

[0001] This invention relates to the field of turbine waste heat recovery and water treatment technology, specifically to a reverse osmosis raw water preheating device for recovering waste heat from the overflow of a turbine jet tank. Background Technology

[0002] During the operation of the steam turbine, the working water of the water jet ejector will rise in temperature after the ejection is completed. In order to ensure the ejection efficiency, the water temperature in the water jet tank needs to be maintained within the optimal range of 26℃ (usually not exceeding 40℃). Therefore, the water jet tank needs to continuously overflow to discharge high-temperature water to achieve cooling.

[0003] In existing technologies, the overflow hot water from the injection tank is often directly discharged into a circulating cooling tower for cooling and recycling, or directly discharged. This results in a significant amount of waste heat carried by the hot water, which is not effectively recovered, leading to energy waste. Simultaneously, the raw water for reverse osmosis water treatment systems is typically sourced at room temperature. In winter or low-temperature environments, the raw water temperature is low, causing a decrease in the permeation efficiency of the reverse osmosis membrane. The feed water temperature of the reverse osmosis system is a key factor affecting the permeate production (typically operating at 20-35℃, with an optimal operating temperature of 25℃): for every 1℃ increase in temperature, the membrane flux increases by approximately 2%-3%. When the feed water temperature is below 20℃, the permeate production will decrease significantly, requiring additional electrical or thermal energy to preheat the raw water, increasing system operating costs.

[0004] In addition, existing raw water tank level control mostly adopts single manual adjustment or simple interlocking, which has problems such as low level control accuracy and manual adjustment. It is easy to cause the raw water tank to overflow when full or the level to be too low, which may lead to the reverse osmosis equipment running dry. At the same time, the overflow of the injection tank and the operation status of the reverse osmosis system are not linked, and the overflow path cannot be flexibly switched according to the equipment operation requirements, which further reduces the economy and safety of the system operation.

[0005] Therefore, we propose a reverse osmosis raw water preheating device for recovering waste heat from the overflow of the turbine jet tank. Summary of the Invention

[0006] The purpose of this invention is to provide a reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank, comprising a jet tank, a jet ejector, a cooling tower circulating water tank, a reverse osmosis water treatment device, a raw water tank, and a control unit. The jet tank is a supporting water storage device for the jet ejector. The side wall of the jet tank is provided with a low overflow port and a high overflow port to realize overflow drainage under different operating conditions. A temperature sensor is installed on the jet tank, and a water supply pipeline is connected to the top of the jet tank. It also includes a low-flow pipe and a high-flow pipe. One end of the low-flow pipe is connected to the low overflow port of the water jet tank, and the other end extends to the water inlet of the raw water tank. It is used to divert the overflow hot water from the water jet tank to the raw water tank to achieve raw water preheating. A manual butterfly valve and an electric regulating valve are installed on the low-flow pipe in sequence along the water flow direction. The manual butterfly valve is used for manual shut-off during system maintenance or failure. The electric regulating valve is used for automatic control of the on / off of the overflow hot water and flow regulation. One end of the high-flow pipe is connected to the high overflow port of the water jet tank, and the other end is connected to the water inlet of the cooling tower circulating water tank. It is used to divert excess hot water in the water jet tank to the cooling tower circulating water tank for cooling when the low-flow pipe is closed. The raw water tank is used to store the raw water for the reverse osmosis water treatment equipment. A liquid level sensor is installed in the raw water tank. The outlet of the raw water tank is connected to the inlet of the reverse osmosis water treatment equipment through a pipe to provide a stable water source for the reverse osmosis water treatment equipment. The reverse osmosis water purification equipment includes a reverse osmosis membrane module, a high-pressure pump, and an operating status sensor. The operating status sensor is used to collect the operating / shutdown status signals of the reverse osmosis water purification equipment.

[0008] Preferably, the control unit is a PLC controller, which is connected to the control terminal signals of the electric regulating valve, liquid level sensor, temperature sensor and reverse osmosis water treatment equipment, respectively, to receive the collected signals of each component and output control commands according to preset logic.

[0009] Preferably, the low overflow port is close to the upper limit of the normal liquid level in the water jet tank, and the high overflow port is 50-100mm higher than the low overflow port.

[0010] Preferably, the liquid level sensor is used to collect the liquid level signal in the raw water tank in real time. The liquid level sensor is set with three thresholds: low liquid level (L), medium liquid level (M), and high liquid level (H), which correspond to 20%, 50%, and 80% of the volume of the raw water tank, respectively.

[0011] Preferably, the top of the raw water tank is provided with a water circulation mechanism, the bottom of the raw water tank is provided with a drainage mechanism, an insulation layer is fixedly connected to the outer wall of the raw water tank, and a protective layer is fixedly connected to the outer wall of the insulation layer.

[0012] Preferably, the water activation mechanism includes a raised seat, which is fixedly installed on the top of the raw water tank. A drive motor is fixedly installed on the top of the raised seat, and a rotating shaft is fixedly connected to the output shaft of the drive motor. An agitator is fixedly installed on the outer wall of the rotating shaft.

[0013] Preferably, the drainage mechanism includes a water-blocking frame, which is fixedly connected to the bottom of the raw water tank. A drainage frame is fixedly connected to the bottom of the water-blocking frame, and a drainage connector is fixedly connected to the side of the drainage frame. A base plate is threaded to the bottom of the drainage frame, and an inner partition is fixedly installed on the inner wall of the drainage frame. An inclined groove is formed on the inner partition.

[0014] Preferably, a partition plate is fixedly installed on the inner wall of the water-proof frame, a through groove is opened at the bottom of the partition plate, a gear is rotatably connected at the center of the top of the partition plate, a cover plate is fixedly installed on the outer wall of the gear, a raised frame is fixedly installed on the outer wall of the water-proof frame, a handle is slidably connected to the inner wall of the raised frame, a rack is fixedly installed at the end of the handle, and the side of the rack meshes with the outer wall of the gear.

[0015] Preferably, a circular cover is movably inserted into the side of the drainage frame, a vibration motor is detachably connected to the outer wall of the circular cover, a filter cylinder located in the inner cavity of the drainage frame is fixedly connected to the inner side of the circular cover, a first rubber ring is fixedly connected to the end of the filter cylinder, and a second rubber ring is fixedly sleeved on the outer wall of the circular cover.

[0016] Preferably, a limiting arm is rotatably connected to the side of the drainage frame, a support block is fixedly installed on the side of the drainage frame, and an elastic element is fixedly installed between the limiting arm and the support block.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. Energy recovery and utilization, reducing operating costs: The waste heat of the overflow hot water in the injection tank is recovered to the raw water tank to preheat the reverse osmosis raw water, avoiding waste of waste heat, reducing the extra preheating energy consumption of the reverse osmosis system due to the low temperature of the raw water, increasing the temperature of the raw water, improving the permeation efficiency of the reverse osmosis membrane, and significantly saving annual electricity or steam costs.

[0018] 2. Closed-loop control, stable and reliable operation: Through the linkage between the liquid level sensor and the electric regulating valve, the liquid level of the raw water tank is accurately controlled, avoiding the problems of overflow when the raw water tank is full or the liquid level is too low; at the same time, a low liquid level prohibition interlock is set to effectively protect the reverse osmosis water treatment equipment, prevent damage from dry running, and improve the safety of system operation.

[0019] 3. Dual-flow design with strong adaptability to operating conditions: The low-flow pipe is used for waste heat recovery and water replenishment, while the high-flow pipe is used for overflow diversion. The two paths automatically switch according to the equipment operating status and liquid level, which not only ensures the efficiency of waste heat recovery, but also avoids the risk of the water tank being full, making it suitable for the needs of different operating conditions.

[0020] 4. Simple structure and low modification difficulty: This device only requires the addition of double diversion pipes, electric regulating valves and sensors at the original overflow port of the water jet tank. There is no need to modify the main structure of the steam turbine and reverse osmosis water treatment unit. The modification cycle is short and the cost is low. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection structure of the water jet tank of the present invention; Figure 2 This is a schematic diagram of the raw water tank of the present invention; Figure 3 This is a schematic diagram of the outer wall structure of the raw water tank of the present invention; Figure 4 This is a schematic diagram of the internal structure of the raw water tank of the present invention; Figure 5 This is a schematic diagram of the drainage mechanism of the present invention; Figure 6 This is a schematic diagram of the internal structure of the water-proof frame of the present invention; Figure 7 This is a schematic diagram of the internal structure of the drainage frame of the present invention; Figure 8 for Figure 7 Enlarged structural diagram at point A; Figure 9 This is a schematic diagram of the structure of the filter cylinder of the present invention; Figure 10 This is a partial cross-sectional structural diagram of the inner partition of the present invention.

[0022] In the diagram: 1. Water jet tank; 2. Water jet air ejector; 3. Cooling tower circulating water tank; 4. Reverse osmosis water treatment equipment; 5. Raw water tank; 51. Insulation layer; 52. Protective layer; 6. Activated water mechanism; 61. Elevating seat; 62. Drive motor; 63. Rotating shaft; 64. Agitator; 7. Drainage mechanism; 71. Water-proof frame; 711. Divider plate; 712. Through groove; 713. Gear; 714. Cover plate; 715. Protruding frame; 716. Handle; 717. Rack; 72. Drainage frame; 73. Drainage connector; 74. Base plate; 75. Inner partition plate; 751. Inclined groove; 76. Circular cover; 761. Vibration motor; 762. Filter cylinder; 763. Rubber ring No. 1; 764. Rubber ring No. 2; 77. Limiting arm; 771. Support block; 772. Elastic element. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-10 The present invention provides a technical solution: a reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank, comprising a jet tank 1, a jet ejector 2, a cooling tower circulating water tank 3, a reverse osmosis water treatment device 4, a raw water tank 5, and a control unit. The jet tank 1 is a supporting water storage device for the jet ejector 2. The side wall of the jet tank 1 is provided with a low overflow port and a high overflow port to realize overflow drainage under different operating conditions. A temperature sensor is installed on the jet tank 1, and a water supply pipeline is connected to the top of the jet tank 1. It also includes a low-flow pipe and a high-flow pipe. One end of the low-flow pipe is connected to the low overflow port of the water jet tank 1, and the other end extends to the water inlet of the raw water tank 5. It is used to divert the overflow hot water of the water jet tank 1 to the raw water tank 5 to achieve raw water preheating. A manual butterfly valve and an electric regulating valve are installed on the low-flow pipe in sequence along the water flow direction. The manual butterfly valve is used for manual shut-off during system maintenance or failure. The electric regulating valve is used for automatic control of the on / off of the overflow hot water and flow regulation. One end of the high-flow pipe is connected to the high overflow port of the water jet tank 1, and the other end is connected to the water inlet of the cooling tower circulating water tank 3. It is used to divert the excess hot water in the water jet tank 1 to the cooling tower circulating water tank 3 for cooling when the low-flow pipe is closed. The raw water tank 5 is used to store the raw water of the reverse osmosis water treatment equipment 4. A liquid level sensor is installed in the raw water tank 5. The outlet of the raw water tank 5 is connected to the inlet of the reverse osmosis water treatment equipment 4 through a pipe to provide a stable water source for the reverse osmosis water treatment equipment 4. The reverse osmosis water treatment equipment 4 includes a reverse osmosis membrane module, a high-pressure pump, and an operating status sensor. The operating status sensor is used to collect the operating / shutdown status signals of the reverse osmosis water treatment equipment 4.

[0025] The electric regulating valve is a DN100 electric ball valve with a nominal pressure of 1.6MPa and an applicable temperature of 0-100℃, equipped with a 4-20mA regulating signal. The level sensor is an immersion level transmitter with a measurement range of 0-5m and an output signal of 4-20mA. The temperature sensor is a PT100 platinum resistance temperature sensor with a measurement range of 0-100℃ and an accuracy of ±0.2℃. The control unit is a Siemens PLC with reverse osmosis control, equipped with analog input modules and digital output modules.

[0026] In the preferred embodiment, the control unit is a PLC controller. The control unit is connected to the control terminal signals of the electric regulating valve, liquid level sensor, temperature sensor and reverse osmosis water purification equipment 4, respectively, to receive the collected signals of each component and output control commands according to preset logic.

[0027] Among them, the instruction output of the control unit follows the following priorities (from high to low): 1. The reverse osmosis water production equipment 4 stops operating → the electric control valve closes; 2. The raw water tank 5 has a low liquid level (L) → the reverse osmosis water production equipment 4 is prohibited from starting; 3. The raw water tank 5 has a high liquid level (H) → the electric control valve closes; 4. The raw water tank 5 has a liquid level below the middle level (<M) → the electric control valve opens.

[0028] In a preferred technical solution of this embodiment, the low overflow port is close to the upper limit of the normal liquid level of the injection water tank 1, and the high overflow port is 50-100 mm higher than the low overflow port.

[0029] In a preferred technical solution of this embodiment, the liquid level sensor is used to collect the liquid level signal in the raw water tank 5 in real time. The liquid level sensor sets three thresholds: low liquid level (L), middle liquid level (M), and high liquid level (H), which respectively correspond to 20%, 50%, and 80% of the volume of the raw water tank 5.

[0030] In a preferred technical solution of this embodiment, a live water mechanism 6 is provided at the top of the raw water tank 5, a drainage mechanism 7 is provided at the bottom of the raw water tank 5, a heat preservation layer 51 is fixedly connected to the outer wall of the raw water tank 5, and a protective layer 52 is fixedly connected to the outer wall of the heat preservation layer 51. The heat preservation layer 51 is made of closed-cell polyurethane foam material, and the protective layer 52 is a FRP composite board. Through the cooperation of the heat preservation layer 51 and the protective layer 52, the heat preservation performance of the outer wall of the raw water tank 5 is improved, and the heat loss in low-temperature weather is effectively reduced.

[0031] In a preferred technical solution of this embodiment, the live water mechanism 6 includes a lifting seat 61. The lifting seat 61 is fixedly installed on the top of the raw water tank 5. A driving motor 62 is fixedly installed on the top of the lifting seat 61. A rotating shaft 63 is fixedly connected to the output shaft of the driving motor 62. A stirring paddle 64 is fixedly installed on the outer wall of the rotating shaft 63. During use, the driving motor 62 can be intermittently controlled to work. When the driving motor 62 works, it can drive the rotating shaft 63 to rotate, and then带动 the stirring paddle 64 to rotate, so as to stir the raw water inside the raw water tank 5, improve the uniformity of the internal temperature of the raw water, and avoid the problem that the large fluctuation of the raw water temperature is likely to interfere with the operation of the reverse osmosis water production equipment 4.

[0032] In a preferred embodiment, the drainage mechanism 7 includes a water-separating frame 71, which is fixedly connected to the bottom of the raw water tank 5. A drainage frame 72 is fixedly connected to the bottom of the water-separating frame 71, and a drainage connector 73 is fixedly connected to the side of the drainage frame 72. A base plate 74 is threadedly connected to the bottom of the drainage frame 72, and an inner partition plate 75 is fixedly installed on the inner wall of the drainage frame 72. An inclined groove 751 is provided on the inner partition plate 75. The inlet end of the reverse osmosis water treatment equipment 4 can be connected to the drainage connector 73, and water is then drawn from the inside of the raw water tank 5. Impurities will accumulate at the bottom of the inner cavity of the drainage frame 72. During maintenance, the base plate 74 can be rotated off from the bottom of the drainage frame 72 to clean the impurities. Impurities in the upper part of the drainage frame 72 cavity will pass through the inner partition plate 75 and enter the bottom of the inner cavity. The design of the inclined groove 751 can hinder the upward movement of the sediment below, avoiding the problem that the sediment at the bottom is easily pumped away.

[0033] In a preferred embodiment, a partition plate 711 is fixedly installed on the inner wall of the water-stop frame 71. A through groove 712 is provided at the bottom of the partition plate 711. A gear 713 is rotatably connected to the center of the top of the partition plate 711. A cover plate 714 is fixedly installed on the outer wall of the gear 713. A protruding frame 715 is fixedly installed on the outer wall of the water-stop frame 71. A handle 716 is slidably connected to the inner wall of the protruding frame 715. A rack 717 is fixedly installed at the end of the handle 716. The side of the rack 717 meshes with the outer wall of the gear 713. Initially... In this state, the cover plate 714 and the through groove 712 do not overlap in the vertical direction. The inner cavity of the original water tank 5 and the drainage frame 72 are connected through the through groove 712. If the drainage frame 72 needs to be maintained as a whole, loosen the bolts on the outer wall of the protruding frame 715, and then push the handle 716 to cause the rack 717 to move horizontally. Since the rack 717 meshes with the gear 713, it can drive the gear 713 to rotate, causing the cover plate 714 to rotate to the position overlapping with the through groove 712. At this time, the through groove 712 is closed, and then the drainage frame 72 can be maintained as a whole.

[0034] In a preferred embodiment, a circular cover 76 is movably inserted into the side of the drainage frame 72. A vibration motor 761 is detachably connected to the outer wall of the circular cover 76. A filter cylinder 762 located inside the drainage frame 72 is fixedly connected to the inner side of the circular cover 76. A first rubber ring 763 is fixedly connected to the end of the filter cylinder 762. A second rubber ring 764 is fixedly fitted onto the outer wall of the circular cover 76. The design of the first rubber ring 763 can seal the space between the end of the filter cylinder 762 and the inner wall of the drainage frame 72. The design of the second rubber ring 764 can seal the openings on the side of the circular cover 76 and the drainage frame 72. Water inside the drain frame 72 passes through the filter cylinder 762 into its inner cavity, and then enters the drain connector 73 for use by the reverse osmosis water treatment equipment 4. During this process, the filter cylinder 762 can intercept larger impurities, reducing the water treatment load of the reverse osmosis water treatment equipment 4. The vibration motor 761 is mounted on the circular cover 76 with screws. The vibration motor 761 is an optional installation component. During installation and use, the vibration motor 761 is controlled to work for a period of time periodically. The circular cover 76 can drive the filter cylinder 762 to vibrate, causing the impurities filtered on the filter cylinder 762 to fall off, increasing the unobstructed flow of the filter cylinder 762, and at the same time reducing the frequency of manual cleaning.

[0035] In a preferred embodiment, a limiting arm 77 is rotatably connected to the side of the drainage frame 72, and a support block 771 is fixedly installed on the side of the drainage frame 72. An elastic element 772 is fixedly installed between the limiting arm 77 and the support block 771. In the initial state, the limiting arm 77 can be pushed by the elastic force of the elastic element 772, causing the side of the limiting arm 77 to partially overlap with the side of the circular cover 76, thus limiting the circular cover 76 on the drainage frame 72. If the circular cover 76 needs to be disassembled and maintained as a whole, the limiting arm 77 can be pushed. This design improves the ease of disassembly and assembly of the circular cover 76 and facilitates the rapid implementation of maintenance work.

[0036] Working principle: Normal operating conditions (reverse osmosis water treatment unit 4 in operation): When the liquid level in the raw water tank 5 is lower than the middle liquid level (M), the liquid level sensor transmits a signal to the control unit. The control unit outputs an opening command, the electric regulating valve opens, and the high-temperature overflow hot water in the water jet tank 1 flows into the raw water tank 5 through the low drainage pipe to preheat the raw water and replenish the water volume of the raw water tank 5 to ensure the continuity of the raw water supply. When the liquid level in the raw water tank 5 rises to the high level (H), the liquid level sensor sends a signal, the control unit outputs a shut-off command, the electric regulating valve closes, and the low drain pipe stops supplying water; at this time, the liquid level in the water jet tank 1 continues to rise, and when it reaches the height of the high overflow port, hot water flows into the cooling tower circulating water tank 3 through the high drain pipe to complete the circulation. The temperature sensor monitors the water temperature in the water jet tank 1 in real time. If the water temperature exceeds the set value (the efficiency threshold of the water jet air pump 2), the control unit can issue a warning signal to remind the operator to check the system operation status and increase the water inlet of the water jet tank 1 to cool it down. Reverse osmosis water purification equipment 4 shutdown conditions: When the reverse osmosis water treatment equipment 4 needs to be shut down, the operation status sensor will transmit the shutdown signal to the control unit. The control unit will immediately output a shutdown command, the electric regulating valve will close, the low drainage pipe will stop supplying water to the raw water tank 5, and the excess hot water in the injection tank 1 will flow into the cooling tower circulating water tank 3 through the high drainage pipe for cooling. Protection conditions: When the liquid level in the raw water tank 5 is lower than the low liquid level (L), the liquid level sensor sends a signal and the control unit outputs a command to prohibit starting. The water pump of the reverse osmosis water treatment equipment 4 cannot start, so as to prevent the equipment from being damaged due to insufficient raw water. Only when the liquid level in the raw water tank 5 rises back to the middle level (M) or above, the control unit releases the prohibition command for starting, and the reverse osmosis water purification equipment 4 can start normally; Manual control mode: When the system needs maintenance or the electric regulating valve malfunctions, the operator can close the manual butterfly valve and cut off the low-level drain pipe. At this time, the overflow hot water from the water jet tank 1 will be discharged separately to the cooling tower circulating water pool 3 through the high-level drain pipe, without affecting the normal operation of the water jet tank 1 and the cooling tower circulating water pool 3.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank, characterized in that: It includes a water jet tank (1), a water jet air pump (2), a cooling tower circulating water pool (3), a reverse osmosis water treatment equipment (4), a raw water pool (5), and a control unit. The water jet tank (1) is a supporting water storage device for the water jet air pump (2). The side wall of the water jet tank (1) is provided with a low overflow port and a high overflow port to realize overflow drainage under different working conditions. A temperature sensor is installed on the water jet tank (1), and a water supply pipe is connected to the top of the water jet tank (1). It also includes a low-flow pipe and a high-flow pipe. One end of the low-flow pipe is connected to the low overflow port of the water jet tank (1), and the other end extends to the water inlet of the raw water tank (5). It is used to divert the overflow hot water of the water jet tank (1) to the raw water tank (5) to achieve raw water preheating. A manual butterfly valve and an electric regulating valve are installed on the low-flow pipe in sequence along the water flow direction. The manual butterfly valve is used for manual shut-off during system maintenance or failure. The electric regulating valve is used for automatic control of the on / off of the overflow hot water and flow regulation. One end of the high-flow pipe is connected to the high overflow port of the water jet tank (1), and the other end is connected to the water inlet of the cooling tower circulating water tank (3). It is used to divert the excess hot water in the water jet tank (1) to the cooling tower circulating water tank (3) for cooling when the low-flow pipe is closed. The raw water tank (5) is used to store the raw water of the reverse osmosis water treatment equipment (4). A liquid level sensor is installed in the raw water tank (5). The outlet of the raw water tank (5) is connected to the inlet of the reverse osmosis water treatment equipment (4) through a pipe to provide a stable water source for the reverse osmosis water treatment equipment (4). The reverse osmosis water treatment equipment (4) includes a reverse osmosis membrane module, a high-pressure pump and an operating status sensor. The operating status sensor is used to collect the operating / shutdown status signal of the reverse osmosis water treatment equipment (4).

2. The reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 1, characterized in that: The control unit is a PLC controller. The control unit is connected to the control terminal signal of the electric regulating valve, liquid level sensor, temperature sensor and reverse osmosis water treatment equipment (4) respectively. It is used to receive the collected signals of each component and output control commands according to the preset logic.

3. The reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 1, characterized in that: The low overflow port is close to the upper limit of the normal liquid level of the water jet tank (1), and the high overflow port is 50-100mm higher than the low overflow port.

4. The reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 1, characterized in that: The liquid level sensor is used to collect the liquid level signal in the raw water tank (5) in real time. The liquid level sensor is set with three thresholds: low liquid level (L), medium liquid level (M), and high liquid level (H), which correspond to 20%, 50%, and 80% of the volume of the raw water tank (5), respectively.

5. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 1, characterized in that: The top of the raw water tank (5) is provided with a water-activating mechanism (6), the bottom of the raw water tank (5) is provided with a drainage mechanism (7), the outer wall of the raw water tank (5) is fixedly connected with an insulation layer (51), and the outer wall of the insulation layer (51) is fixedly connected with a protective layer (52).

6. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 5, characterized in that: The water-activating mechanism (6) includes a raised seat (61), which is fixedly installed on the top of the raw water tank (5). A drive motor (62) is fixedly installed on the top of the raised seat (61). A rotating shaft (63) is fixedly connected to the output shaft of the drive motor (62). A stirring paddle (64) is fixedly installed on the outer wall of the rotating shaft (63).

7. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 5, characterized in that: The drainage mechanism (7) includes a water-blocking frame (71), which is fixedly connected to the bottom of the original water tank (5). A drainage frame (72) is fixedly connected to the bottom of the water-blocking frame (71). A drainage connector (73) is fixedly connected to the side of the drainage frame (72). A base plate (74) is threadedly connected to the bottom of the drainage frame (72). An inner partition plate (75) is fixedly installed on the inner wall of the drainage frame (72). An inclined groove (751) is provided on the inner partition plate (75).

8. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 7, characterized in that: A partition plate (711) is fixedly installed on the inner wall of the water-proof frame (71). A through groove (712) is opened at the bottom of the partition plate (711). A gear (713) is rotatably connected at the center of the top of the partition plate (711). A cover plate (714) is fixedly installed on the outer wall of the gear (713). A protruding frame (715) is fixedly installed on the outer wall of the water-proof frame (71). A handle (716) is slidably connected on the inner wall of the protruding frame (715). A rack (717) is fixedly installed at the end of the handle (716). The side of the rack (717) meshes with the outer wall of the gear (713).

9. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 7, characterized in that: A circular cover (76) is movably inserted into the side of the drainage frame (72). A vibration motor (761) is detachably connected to the outer wall of the circular cover (76). A filter cylinder (762) located in the inner cavity of the drainage frame (72) is fixedly connected to the inner side of the circular cover (76). A first rubber ring (763) is fixedly connected to the end of the filter cylinder (762). A second rubber ring (764) is fixedly fitted onto the outer wall of the circular cover (76).

10. A reverse osmosis raw water preheating device for recovering waste heat from the overflow of a steam turbine jet tank according to claim 9, characterized in that: The side of the drainage frame (72) is rotatably connected to a limiting arm (77), and a support block (771) is fixedly installed on the side of the drainage frame (72). An elastic element (772) is fixedly installed between the limiting arm (77) and the support block (771).

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