Nuclear energy steam multi-functional seawater desalination system

Abstract

The utility model belongs to nuclear energy steam application technical field, concretely relates to a kind of nuclear energy steam multifunctional seawater desalination system, the system includes lithium bromide absorption refrigerating plant, heat exchanger A, heat exchanger B and seawater desalination device, the lithium bromide absorption refrigerating plant is equipped with heat source inlet, heat source outlet, cooling water inlet and cooling water outlet, the lithium bromide absorption refrigerating plant heat source outlet is connected the heat exchanger A shell side entrance by pipeline, the lithium bromide absorption refrigerating plant cooling water outlet is connected the heat exchanger A pipe side entrance by pipeline;The pipe side outlet of the heat exchanger A is connected the pipe side entrance of the heat exchanger B by pipeline, the pipe side outlet of the heat exchanger B is connected the inlet of the seawater desalination device by pipeline, and the outlet of the seawater desalination device is connected the shell side entrance of the heat exchanger B by pipeline.This system is equipped with seawater desalination and air conditioning refrigeration multiple functions, by using heat exchanger to the thermal energy multiple use of nuclear energy steam, the energy of nuclear energy steam is fully utilized, and the application scene of nuclear energy steam is increased.

Description

Technical Field

[0001] This utility model belongs to the field of nuclear steam application technology, specifically relating to a multifunctional seawater desalination system using nuclear steam. Background Technology

[0002] Seawater desalination refers to the general term for water treatment technologies that remove most of the salt from seawater, making the treated water meet water use standards. There are many types of seawater desalination technologies, but the main ones suitable for industrialization are reverse osmosis and distillation. Distillation methods mainly include multi-stage flash distillation, low-temperature multi-effect distillation, and steam compression distillation. Among existing technologies, the most common application of nuclear power steam is driving turbines to generate electricity. In recent years, applications of nuclear steam for residential and industrial heating have also been developed. Currently, further applications of nuclear steam are relatively limited. Using steam from nuclear power plants as an energy source for seawater desalination can fully utilize the infrastructure of nuclear power plants and reduce the construction and operating costs of desalination plants. However, existing technologies lack relevant nuclear power plant steam application systems. Utility Model Content

[0003] This invention proposes a multifunctional seawater desalination system using nuclear steam, which addresses the lack of existing systems that utilize nuclear steam for seawater desalination.

[0004] The technical solution of this utility model: This invention proposes a multifunctional nuclear steam seawater desalination system. The system includes a lithium bromide absorption refrigeration device, heat exchanger A, heat exchanger B, and a seawater desalination device. The lithium bromide absorption refrigeration device has a heat source inlet, a heat source outlet, a cooling water inlet, and a cooling water outlet. The heat source outlet of the lithium bromide absorption refrigeration device is connected to the shell-side inlet of heat exchanger A via a pipe, and the cooling water outlet of the lithium bromide absorption refrigeration device is connected to the tube-side inlet of heat exchanger A via a pipe. The tube-side outlet of heat exchanger A is connected to the tube-side inlet of heat exchanger B via a pipe, the tube-side outlet of heat exchanger B is connected to the inlet of the seawater desalination device via a pipe, and the outlet of the seawater desalination device is connected to the shell-side inlet of heat exchanger B via a pipe.

[0005] In some embodiments, the cooling water inlet of the lithium bromide absorption refrigeration unit is connected to a feed water pump, which pumps seawater into the lithium bromide absorption refrigeration unit; the lithium bromide absorption refrigeration unit is provided with a heat source inlet for the introduction of nuclear steam.

[0006] In some embodiments, the seawater desalination device includes a circulating pump, a steam recompression distillation device, a gas-liquid separator, and a steam compressor assembly. The steam recompression distillation device is connected to the gas-liquid separator. The steam recompression distillation device has a water inlet and a steam inlet. The water inlet of the steam recompression distillation device is connected to the tube-side outlet of heat exchanger B through a pipe. The gas-liquid separator is connected to the steam compressor assembly and the circulating pump through pipes. The circulating pump is connected to the water inlet of the steam recompression distillation device through a pipe. The steam compressor assembly is connected to the steam inlet of the steam recompression distillation device through a pipe.

[0007] In some embodiments, the steam recompression distillation apparatus has a salt crystal and concentrated solution outlet at the bottom, and the steam recompression distillation apparatus also has a condensate outlet, the condensate outlet pipe being connected to the shell-side inlet of heat exchanger B.

[0008] In some embodiments, the steam recompression distillation apparatus is connected to a non-condensable gas discharge pipe, which is used to remove non-condensable gases generated during the seawater desalination process.

[0009] In some embodiments, the steam compressor assembly includes a steam compressor and a turbine, with the steam compressor connected to the turbine and the steam compressor connected to the steam inlet of the gas-liquid separator and the steam recompression distillation unit via pipes, and the turbine driven by nuclear steam to perform work.

[0010] In some embodiments, the steam compressor assembly includes an electric steam compressor connected via pipes to the steam inlet of the gas-liquid separator and the steam recompression distillation unit, respectively.

[0011] In some embodiments, valve A is provided on the pipe connecting the heat source outlet of the lithium bromide absorption refrigeration device to the shell-side inlet of heat exchanger A, valve B is provided on the non-condensable gas discharge pipe, and valve C is provided on the pipe connecting the outlet of the seawater desalination device to the shell-side inlet of heat exchanger B.

[0012] In some embodiments, the shell-side outlet of heat exchanger B is connected to a desalination bed, which is used to purify the condensate produced by the seawater desalination unit and further improve the quality of the effluent.

[0013] In some embodiments, the cooling water inlet of the lithium bromide absorption refrigeration unit is connected to a wastewater treatment unit, which is connected to the reclaimed water discharged from the wastewater treatment plant, and the system can be used for wastewater purification.

[0014] The beneficial effects of this utility model are: This invention proposes a multifunctional seawater desalination system powered by nuclear steam. The system integrates seawater desalination and air conditioning functions. By employing a heat exchanger for the cascaded utilization of the thermal energy of nuclear steam, it fully utilizes the energy of the nuclear steam and expands its application scenarios. This system can provide various energy and raw material forms, including chilled water for air conditioning, domestic hot water, desalinated water, and demineralized water, using steam as a heat source and supplemented by electricity. Simultaneously, it can achieve the purification and reuse of industrial water and wastewater in industrial parks, providing a novel solution for achieving a circular economy and utilizing waste heat and pressure in industrial parks. Attached Figure Description

[0015] Figure 1 A schematic diagram of a multifunctional nuclear steam desalination system designed for this utility model; Figure 2 This is a schematic diagram of wastewater purification in a nuclear steam multifunctional seawater desalination system according to the present invention; Figure 3 This is a schematic diagram of an electric steam compressor system for a nuclear-powered steam multifunctional seawater desalination system according to the present invention; Figure descriptions: 1. Lithium bromide absorption refrigeration unit; 2. Feed water pump; 3. Valve A; 4. Heat exchanger A; 5. Heat exchanger B; 6. Circulation pump; 7. Steam recompression distillation unit; 8. Gas-liquid separator; 9. Valve B; 10. Steam compressor; 11. Turbine; 12. Valve C; 13. Electric steam compressor; 14. Desalination bed; 15. Wastewater treatment unit. Detailed Implementation

[0016] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, this utility model proposes a nuclear steam multifunctional seawater desalination system, which includes a lithium bromide absorption refrigeration device 1, a heat exchanger A4, a heat exchanger B5, a feed water pump 2, a valve A3, and a seawater desalination device.

[0018] The lithium bromide absorption refrigeration unit 1 drives a refrigeration cycle through a heat source. The unit heats lithium bromide using this heat source. It has a heat source inlet, a heat source outlet, a cooling water inlet, and a cooling water outlet. The unit cools both air conditioning and domestic hot water using the heat source and cooling water. The heat source inlet of the unit is connected to nuclear steam, and the cooling water inlet is connected to a feedwater pump 2, which pumps seawater into the unit.

[0019] The heat source outlet of the lithium bromide absorption refrigeration unit 1 is connected to the shell-side inlet of heat exchanger A4 via a pipe. A valve A3 is installed on this pipe. The cooling water outlet of the lithium bromide absorption refrigeration unit 1 is connected to the tube-side inlet of heat exchanger A4 via a pipe. Seawater absorbs heat from the steam inside the lithium bromide absorption refrigeration unit 1 and is heated. It then flows to the cooling water outlet. Part of the heated seawater is discharged from the unit and returned to the sea, while the remaining seawater continues to enter the tube-side inlet of heat exchanger A4 via a pipe. Nuclear steam, after passing through the lithium bromide absorption refrigeration unit 1, forms low-temperature water vapor or condensate, which enters the shell-side inlet of heat exchanger A4 via a pipe. Heat exchanger A4 transfers heat to the seawater, further raising its temperature. The nuclear steam, after heat exchange, becomes condensate and is discharged from the system through the shell-side outlet of heat exchanger A4.

[0020] The tube-side outlet of heat exchanger A4 is connected to the tube-side inlet of heat exchanger B5 via a pipe. The tube-side outlet of heat exchanger B5 is connected to the inlet of the seawater desalination unit. The condensate outlet of the seawater desalination unit is connected to the shell-side inlet of heat exchanger B5 via a pipe, which is equipped with valve C12. Heat exchanger B5 exchanges heat with the heated seawater flow and the condensate discharged from the outlet of the steam recompression distillation unit 7 of the seawater desalination unit, utilizing the waste heat of the condensate to heat the seawater and reduce energy loss. If cleaner water is required, the shell-side outlet of heat exchanger B5 can be connected to a desalination bed 14, which is used to purify the condensate produced by the seawater desalination unit. The desalination bed 14 can further remove the salt contained in the secondary steam condensate to obtain deionized water or demineralized water, meeting the water requirements of nuclear power plants or industrial applications and realizing the cascade utilization of heat.

[0021] The seawater desalination unit includes a circulating pump 6, a steam recompression distillation unit 7, a gas-liquid separator 8, a valve B9, a steam compressor 10, and a turbine 11. The top of the steam recompression distillation unit 7 is provided with a water inlet, which is connected to the tube side of the steam recompression distillation unit 7. The water inlet is connected to the tube side outlet of the heat exchanger B5 through a pipe. The steam recompression distillation unit 7 is also provided with a condensate outlet, which is connected to the shell side inlet of the heat exchanger B5 through a pipe.

[0022] The steam recompression distillation unit 7 is connected to the gas-liquid separator 8. The gas distilled by the steam recompression distillation unit 7 enters the gas-liquid separator 8 for vapor-liquid separation, forming a concentrated liquid and water vapor. The gas-liquid separator 8 is connected to the circulation pump 6 and the steam compressor 10 through pipelines. The circulation pump 6 is connected to the water inlet of the steam recompression distillation unit 7 through a pipeline. The concentrated liquid from the steam recompression distillation unit 7 is then driven by the circulating pump 6 in the gas-liquid separator 8 and re-enters the upper water inlet of the steam recompression distillation unit 7 for repeated evaporation and concentration. This process purifies seawater and wastewater, yielding fresh water, corresponding salt crystals, and concentrated liquid. The steam compressor 10 is connected to the turbine 11 and, through a pipeline, to the steam inlet of the steam recompression distillation unit 7. The steam is compressed by the compressor to increase its parameters and then condenses on the shell side of the steam recompression distillation unit 7, releasing energy. The turbine 11 is powered by nuclear steam to perform work. This work by the turbine 11 compresses the steam separated from the gas-liquid separator 8 through the steam compressor 10, increasing the steam pressure. The compressed steam is then input into the steam recompression distillation unit 7, where it condenses on the shell side, releasing its latent heat of vaporization. This secondary steam pressurization and condensation method utilizes the latent heat of steam, reducing the energy required for the distillation process. The heat released during this process can further heat the seawater to be treated on the heat exchanger side of the steam recompression distillation unit 7, causing it to boil at a lower pressure, achieving low-pressure distillation, further reducing the temperature required for evaporation and reducing heat source requirements. The bottom of the steam recompression distillation unit 7 is equipped with salt crystal and concentrated solution outlets. These outlets recover salt by discharging the crystals or concentrate, and maintain the normal operation of the distillation unit. The steam recompression distillation unit 7 is connected to a non-condensable gas emission pipe, which is equipped with valve B9. This non-condensable gas emission pipe is used to remove non-condensable gases released during seawater desalination.

[0023] In some embodiments, such as Figure 2 As shown, the cooling water inlet of the lithium bromide absorption refrigeration unit 1 is connected to the wastewater treatment unit 15, which in turn receives reclaimed water discharged from the wastewater treatment plant. This system utilizes this water source as cooling water to both utilize the industrial park's wastewater and, after treatment by the steam recompression distillation unit 7, obtain high-purity purified water and deionized water. Furthermore, an electric steam compressor 13 can replace the combination of steam compressor 10 and turbine 11, reducing the consumption of medium and low-pressure steam and allowing the use of clean electricity from the park's wind / solar power sources for power generation, making operation more flexible.

[0024] In some embodiments, such as Figure 3 As shown, this solution can also replace the steam recompressor and turbine 11 with an electric steam compressor 13, thereby reducing the amount of medium and low pressure steam used by using electricity and reducing the amount of steam used by utilizing green electricity such as wind power or photovoltaic power.

[0025] This system can utilize steam as a heat source, supplemented by electricity, to provide various energy and raw material forms, including chilled water for air conditioning, domestic hot water, desalinated water, and demineralized water. Furthermore, the heat source used in lithium bromide absorption refrigeration can be waste heat steam from the end of a factory or industrial park's steam pipeline network. The steam temperature and pressure requirements are not high, allowing for the cascade utilization of steam and reducing energy loss within the park. Simultaneously, it enables the purification and reuse of industrial water and wastewater within the park, providing a novel solution for achieving a circular economy and utilizing waste heat and pressure.

[0026] The embodiments of this utility model have been described in detail above. This utility model is not limited to the above examples. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this utility model.

Claims

1. A multifunctional seawater desalination system powered by nuclear steam, characterized in that, The system includes a lithium bromide absorption refrigeration device (1), a heat exchanger A (4), a heat exchanger B (5), and a seawater desalination device. The lithium bromide absorption refrigeration device (1) is provided with a heat source inlet, a heat source outlet, a cooling water inlet, and a cooling water outlet. The heat source outlet of the lithium bromide absorption refrigeration device (1) is connected to the shell-side inlet of the heat exchanger A (4) through a pipe. The cooling water outlet of the lithium bromide absorption refrigeration device (1) is connected to the tube-side inlet of the heat exchanger A (4) through a pipe. The tube-side outlet of the heat exchanger A (4) is connected to the tube-side inlet of the heat exchanger B (5) through a pipe. The tube-side outlet of the heat exchanger B (5) is connected to the inlet of the seawater desalination device through a pipe. The outlet of the seawater desalination device is connected to the shell-side inlet of the heat exchanger B (5) through a pipe.

2. The nuclear steam multifunctional seawater desalination system according to claim 1, characterized in that, The lithium bromide absorption refrigeration device (1) has a cooling water inlet connected to a water supply pump (2), which pumps seawater into the lithium bromide absorption refrigeration device (1); the lithium bromide absorption refrigeration device (1) has a heat source inlet through which nuclear steam is introduced.

3. The nuclear steam multifunctional seawater desalination system according to claim 1, characterized in that, The seawater desalination device includes a circulating pump (6), a steam recompression distillation device (7), a gas-liquid separator (8), and a steam compressor assembly. The steam recompression distillation device (7) is connected to the gas-liquid separator (8). The steam recompression distillation device (7) is provided with a water inlet and a steam inlet. The water inlet is connected to the tube-side outlet of the heat exchanger B (5) through a pipe. The gas-liquid separator (8) is connected to the steam compressor assembly and the circulating pump (6) through pipes. The circulating pump (6) is connected to the water inlet of the steam recompression distillation device (7) through a pipe. The steam compressor assembly is connected to the steam inlet of the steam recompression distillation device (7) through a pipe.

4. The nuclear steam multifunctional seawater desalination system according to claim 3, characterized in that, The bottom of the steam recompression distillation apparatus (7) is provided with salt crystal and concentrated solution outlets. The steam recompression distillation apparatus (7) is also provided with condensate outlet, and the condensate outlet pipe is connected to the shell-side inlet of the heat exchanger B (5).

5. A multifunctional seawater desalination system using nuclear steam according to claim 4, characterized in that, The steam recompression distillation device (7) is connected to a non-condensable gas discharge pipe, which is used to remove non-condensable gases generated during seawater desalination.

6. The nuclear steam multifunctional seawater desalination system according to claim 3, characterized in that, The steam compressor assembly includes a steam compressor (10) and a turbine (11). The steam compressor (10) is connected to the turbine (11). The steam compressor (10) is connected to the steam inlet of the gas-liquid separator (8) and the steam recompression distillation device (7) through pipes. The turbine (11) is driven by nuclear steam to do work.

7. A multifunctional seawater desalination system using nuclear steam according to claim 6, characterized in that, The steam compressor assembly includes an electric steam compressor (13), which is connected via pipes to the steam inlet of the gas-liquid separator (8) and the steam recompression distillation unit (7).

8. A nuclear steam multifunctional seawater desalination system according to claim 5, characterized in that, The lithium bromide absorption refrigeration device (1) has a valve A (3) on the pipe connecting the heat source outlet to the shell-side inlet of heat exchanger A (4), a valve B (9) on the non-condensable gas discharge pipe, and a valve C (12) on the pipe connecting the outlet of the seawater desalination device to the shell-side inlet of heat exchanger B (5).

9. A multifunctional seawater desalination system using nuclear steam according to claim 1, characterized in that, The shell-side outlet of the heat exchanger B (5) is connected to a desalination bed (14), which is used to purify the condensate produced by the seawater desalination device.

10. A multifunctional nuclear steam desalination system according to claim 1, characterized in that, The lithium bromide absorption refrigeration device (1) has its cooling water inlet connected to a sewage treatment device (15), which is connected to the greywater discharged from the sewage treatment plant. The system is used for sewage purification.

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