An automated energy storage device and method for a uranium enrichment plant

Abstract

This invention relates to the field of energy conservation, and more particularly to an apparatus and method for automatic energy storage in uranium enrichment plants. The apparatus includes: a main process refrigeration system, a storage tank, a heat exchanger, a photovoltaic power station, and a detection and control system; the heat exchanger of the main process refrigeration system is connected to the storage tank and the heat exchanger via pipelines; the photovoltaic power station is connected to the compressor unit of the main process refrigeration system; the detection and control system collects real-time pump operating data, photovoltaic power station output current, and valve opening data, and automatically adjusts the pump operating data, the switching between the photovoltaic power station and the power grid, and the valve openings according to temperature and energy status to achieve heat storage, heat release, cold storage, and cold release.

Description

Technical Field

[0001] This invention relates to the field of energy conservation, and more particularly to an apparatus and method for automatic energy storage in uranium enrichment plants. Background Technology

[0002] With the ongoing global energy transition, the proportion of renewable energy in the power system is increasing, especially solar energy, which, as a highly promising new energy source, has been widely applied globally in recent years. However, solar power generation is affected by factors such as day and night and weather; it is almost impossible to generate electricity at night and on cloudy days, making it difficult for solar power to directly meet the demand for stable and continuous power supply from the power system. Energy storage technology, as a key support for the development of clean energy, plays a crucial role in peak and frequency regulation of the power system, responding to sudden faults, and ensuring the reliability of power supply. It is of great significance for solving the problems of energy intermittency and instability, effectively promoting the development and consumption of new energy sources, driving energy transition, achieving sustainable development, improving energy efficiency, and helping to achieve the "dual carbon" goals.

[0003] Common energy storage technologies such as lithium-ion batteries and lead-acid batteries have relatively low energy density and short cycle life, which cannot meet the high energy storage requirements of uranium enrichment plants.

[0004] During the operation of the main equipment in a uranium enrichment plant, a large amount of low-grade heat is generated, which is typically removed by electric cooling and released into the atmosphere. Electric cooling accounts for over 90% of the energy consumption of the uranium enrichment auxiliary process system.

[0005] Meanwhile, uranium enrichment production also requires heating. The temperature of the feedstock and feedhouses for uranium enrichment production must be no lower than 25°C year-round, and the operating environment temperature of the main processes must be controlled within the range of 14-20°C year-round. Uranium enrichment production is continuous and uninterrupted, and operators need to shower. In winter, especially in uranium enrichment plants in the north, there is also a need for heating in offices, workshops, duty rooms, and process areas.

[0006] With the increasing maturity of heat pump technology and the emergence of high-temperature heat pumps, the main process refrigeration system of uranium enrichment plants has begun to select dual-mode heat pump units for heating and cooling. The evaporation end of the heat pump unit produces cooling water to meet the operation of the centrifuge, and the condensation end produces hot water for heating, showering, preheating of the centrifuge, and vacuum drying.

[0007] The main process refrigeration system of existing uranium enrichment plants, such as Figure 1As shown, the system includes main equipment, a refrigeration unit, and a cooling tower. The main equipment 1 is both a cold user and a heat source for thermal storage. The heat users 5 include those for showers, offices, factory heating, uranium enrichment feedstock supply and extraction facilities, and cascade hall air conditioning and heating. The refrigeration unit includes an evaporator 3, a condenser 4, a compressor, and an expansion valve, with conventional connections. The inlet of the evaporator 3 is connected to the outlet of the main equipment 1, and a first valve 11, a first pipe end 8, and a refrigeration pump 2 are installed on the pipe connecting the inlet of the evaporator 3 and the outlet of the main equipment 1. The outlet of the evaporator 3 is connected to the inlet of the main equipment 1, and a second valve 12 is installed on the pipe connecting the outlet of the evaporator 3 and the inlet of the main equipment 1.

[0008] The condenser 4 inlet is connected to the cooling tower 7 outlet. A cooling pump 6 and a ninth valve 19 are installed on the pipe connecting the condenser 4 inlet and the cooling tower 7 outlet. The condenser 4 outlet is connected to the heat user 5 inlet. A third pipe end 10, a fourth valve 14, a second pipe end 9, and a third valve 13 are installed on the pipe connecting the heat user 4 outlet and the heat user 5 inlet. The heat user 5 outlet is connected to the third pipe end 10. A sixth valve 16 and a fifth valve 15 are installed on the pipe connecting the heat user 5 outlet and the third pipe end 10. The sixth valve 16 inlet is connected to the cooling pump 6 outlet, and the sixth valve 16 outlet is connected to the cooling pump 6 inlet. A seventh valve 17 is installed on the pipe connecting the sixth valve 16 inlet and the cooling pump 6 outlet, and an eighth valve 18 is installed on the pipe connecting the sixth valve 16 outlet and the cooling pump 6 inlet. The eighth valve 18 inlet is connected to the cooling tower 7 inlet, and a tenth valve 20 is installed on the pipe connecting the eighth valve 18 inlet and the cooling tower 7 inlet.

[0009] Because the process requires that the daily fluctuation of the cooling water temperature not exceed 1℃, when using a heat pump unit for both cooling and heating, the temperature fluctuation causes the heat load to fluctuate, which in turn affects the stability of the cooling supply. Summary of the Invention

[0010] The technical problem to be solved by this invention is to provide an automatic energy storage device and method for uranium enrichment plants, which utilizes solar energy for cooling to improve energy utilization efficiency, reduce carbon emissions, and lower production and operating costs; improves the operational stability of the process cooling system by storing waste heat from the uranium enrichment process; and automatically stores energy based on seasonal changes and big data analysis technology to improve energy storage efficiency and save labor costs.

[0011] This invention provides an automatic energy storage device for a uranium enrichment plant, comprising: a main process refrigeration system, a storage tank, a heat exchanger, a photovoltaic power station, and a detection and control system;

[0012] The plate heat exchanger includes a primary side and a secondary side;

[0013] The plate heat exchanger secondary side inlet is connected to the second pipe end, and the second pipe end is then connected to the refrigeration pump outlet; the plate heat exchanger secondary side outlet is respectively connected to the second valve inlet and the third valve outlet; a stop valve is installed on the pipe connecting the plate heat exchanger secondary side outlet and the second valve inlet, and the stop valve outlet is then connected to the third pipe end.

[0014] The primary outlet of the plate heat exchanger is connected to the inlet of the cooling pump; a shut-off valve is installed on the pipe connecting the primary outlet of the plate heat exchanger and the inlet of the cooling pump.

[0015] The bottom of the storage tank is connected to the secondary side outlet, the primary side inlet, and the primary side outlet of the plate heat exchanger, respectively. A shut-off valve is installed on the pipe connected to the outlet of the stop valve at the bottom of the storage tank.

[0016] An energy release pump is installed on the pipeline connecting the bottom of the storage tank to the primary inlet of the plate heat exchanger.

[0017] The upper end of the storage tank is connected to the outlet of the ninth valve, the first pipe end, and the inlet of the eighth valve, respectively.

[0018] The photovoltaic power station is connected to the compressor unit of the main process refrigeration system;

[0019] The motors of the energy release pump, the refrigeration pump, and the cooling pump are each equipped with a frequency converter;

[0020] The detection and control system collects real-time operating data of the energy release pump, refrigeration pump, cooling pump, photovoltaic power station output current, and valve opening data. Based on temperature and energy status, it automatically adjusts the operating data of the energy release pump, refrigeration pump, cooling pump, photovoltaic power station switching with the grid, and valve opening to achieve heat storage, heat release, cold storage, and cold release.

[0021] In one specific embodiment of the present invention, a check valve is provided on the pipe connecting the second pipe end to the outlet of the refrigeration pump.

[0022] A stop valve and a stop valve are installed on the pipeline connecting the outlet of the secondary side of the plate heat exchanger to the inlet of the second valve. A stop valve is installed on the pipeline connecting the outlet of the stop valve to the third pipe end.

[0023] A bypass valve is installed on the pipeline connecting the secondary outlet of the plate heat exchanger and the outlet of the third valve.

[0024] A stop valve and a stop valve are installed on the pipeline connecting the bottom of the storage tank to the outlet of the stop valve.

[0025] A shut-off valve is installed on the pipeline connecting the bottom of the storage tank to the primary outlet pipeline of the heat exchanger.

[0026] A stop valve is installed on the pipeline connecting the upper end of the storage tank to the outlet of the stop valve 9. The outlet of the stop valve 9 is also connected to the inlet of the energy release pump and a stop valve 7 is installed thereon. A stop valve 4 is installed on the pipeline connecting the upper end of the storage tank to the first pipe end. A stop valve 1 is installed on the pipeline connecting the upper end of the storage tank to the inlet of the stop valve 8.

[0027] In one specific embodiment of the present invention, the photovoltaic power station is equipped with a light intensity detection sensor to detect the output current of the photovoltaic power generation in real time, and the detection data is transmitted to the detection and control system.

[0028] In one specific embodiment of the present invention, the detection and control system includes a computer terminal and a process station;

[0029] The process station is used to collect data from monitoring points and upload it to a computer terminal, receive control commands from the computer terminal and execute adjustments to the monitoring points according to the control commands, and perform PID control on the monitoring points.

[0030] The computer terminal is used to receive data collected by the process station, determine whether to execute heat storage, heat release, cold storage or cold release programs based on the energy storage operation model and the actual external temperature, and issue adjustment commands to the process station.

[0031] In one specific embodiment of the present invention, the computer terminal includes an energy storage operation model, a display module, and an advanced control module;

[0032] The display module is used to display the collected data and control scheme of each monitoring point;

[0033] The advanced control module is used to determine whether to execute a heat storage, heat release, cold storage, or cold release procedure based on the energy storage operation model and the actual external temperature, and to issue adjustment commands and plans to the process station.

[0034] The energy storage operation model includes a summer operation model and a winter operation model;

[0035] The summer operation model is based on historical solar power generation data and weather forecasts. When daytime sunshine hours exceed 4 hours and the predicted sunshine hours for the next day are also expected to exceed 4 hours, the photovoltaic power station supplies power to the chiller units and related pumps, storing cold in storage tanks. At night, the chiller units are shut down, and the storage tanks supply cooling to the main equipment. When daytime sunshine hours are less than 4 hours and the predicted sunshine hours for the next day are also expected to be less than 4 hours, or on cloudy days, the photovoltaic power station supplies power to the chiller units and related water pumps, storing cold in the storage tanks without releasing cold. The winter operation model involves the municipal power grid supplying power to the chiller units and related water pumps. During the day, the chiller units' evaporators generate cold to supply cooling to the main equipment, while the condensers generate heat, storing heat in storage tanks. At night, the chiller units are shut down, and the cooling towers combined with plate heat exchangers supply cooling to the main equipment, while the storage tanks supply heat to heat users.

[0036] In one specific embodiment of the present invention, the low-temperature water in the storage tank is always in the lower layer and the high-temperature water is always in the upper layer, so as to achieve natural stratification of the energy storage water body and ensure that they do not disturb each other during the energy storage and release process.

[0037] This invention provides a method for automatic energy storage in a uranium enrichment plant based on the aforementioned energy storage device, comprising the following steps:

[0038] The energy storage and release are set according to a temperature-triggered scheduling algorithm. The period when the outdoor minimum temperature is consistently above 15°C after sunrise is designated as the cold storage period. When the temperature reaches 15°C after sunrise, the refrigeration unit automatically operates in cooling mode, the evaporator produces chilled water to supply the storage tank for cold storage, and the condenser dissipates heat through the cooling tower. The period after sunset is designated as the cold release period. The refrigeration unit stops operating, the cooling pump and energy release pump automatically start, and the storage tank begins to release cold water to supply cooling to the main equipment. The period when the outdoor maximum temperature is below 10°C is designated as the heat storage period. When the outdoor temperature is above 0°C, the refrigeration unit automatically operates in heating mode. The evaporator produces chilled water to supply the main equipment to remove the heat generated by the main equipment, and the condenser produces 65°C hot water to be stored in the storage tank. The period when the outdoor temperature is below 0°C is designated as the heat release period. The refrigeration unit stops operating, the cooling pump and energy release pump automatically start, and the storage tank releases heat.

[0039] In one specific embodiment of the present invention, during the cold storage period, when the minimum solar irradiance reaches the starting current of the cooling pump, the cooling pump automatically starts running. As the irradiance gradually increases to the starting current of the refrigeration pump, the refrigeration pump automatically starts running. When the irradiance further increases to the starting current of the refrigeration unit, the refrigeration unit automatically starts and gradually loads, and the evaporator produces chilled water which enters the storage tank to begin cold storage. As the irradiance begins to weaken, the refrigeration unit automatically reduces its load until the irradiance can no longer support the operation of the refrigeration unit, at which point the refrigeration unit automatically stops running. Subsequently, the cooling pump automatically stops, the power supply to the refrigeration pump automatically switches to the municipal power grid, the energy release pump automatically starts, and the storage tank begins to release cold.

[0040] In a specific embodiment of the present invention, the cold storage period is operated as follows: valves 1, 2, 2, 3, 1, 7, 6, 3, 2, and 1 are closed; valves 10, 9, 5, and 4 are open; the chilled water pump operates; and the water cooled by the evaporator enters the storage tank for storage. Valve 4, 7, and 8 are closed; valves 5, 6, 10, and 9 are open; the cooling pump operates; and the cooling tower dissipates heat from the condenser.

[0041] In a specific embodiment of the present invention, the cooling release period is specifically operated as follows: valves 2, 5, 7, 8, 4, and 6 are closed, valves 3 and 1 are open, the energy release pump is powered by the municipal power grid, and the primary side of the heat exchanger releases cooling through heat exchange with the secondary side of the heat exchanger; valves 4, 3, bypass valve, 9, and 3 are closed, valves 2, 1, 10, 2, and 1 are open, the refrigeration pump automatically switches to municipal power grid power supply, and the secondary side of the heat exchanger supplies cooling to the main operating equipment through heat exchange with the primary side of the heat exchanger.

[0042] In a specific embodiment of the present invention, during the heat storage period, the specific operating mode is as follows: stop valve 2, stop valve 10, and stop valve 4 are closed, valve 1 and valve 2 are open, the chilled pump is running, and the evaporator directly supplies cooling to the main equipment; valve 7, valve 5, valve 4, stop valve 1, stop valve 7, stop valve 5, stop valve 1, stop valve 3, valve 8, and valve 9 are closed, stop valve 3, stop valve 9, stop valve 6, stop valve 2, and stop valve 8 are open, the cooling pump is running, and the condenser produces 65°C hot water which enters the storage tank for storage.

[0043] In a specific embodiment of the present invention, the heat release period is specifically operated as follows: valves 1, 4, 5, 9, and 3 are closed, valves 6, 7, and 2 are open, the energy release pump operates, and heat is supplied to the secondary side of the plate heat exchanger through the primary side; valves 6, 3, 2, 3, 1, 10, 9, and 8 are closed, valves 7, 5, 4, bypass valve, and 8 are open, the cooling pump operates, and heat is supplied to heat users through the secondary side of the plate heat exchanger.

[0044] Compared with the prior art, the automatic energy storage device and method for uranium enrichment plants of the present invention have the following beneficial effects:

[0045] (1) Utilizing solar energy storage solves the problems of intermittency and instability of solar power supply, and ensures the reliability and economy of cooling for the main process; utilizing waste heat storage for heating not only meets the cooling needs of the main process, but also reduces production costs and carbon emissions.

[0046] (2) Regardless of whether it is heat storage and release or cold storage and release, the low temperature water is always in the lower layer and the high temperature water is always in the upper layer, realizing the natural stratification of the energy storage water body, avoiding disturbance in the energy storage and release process, and improving the energy storage and release efficiency.

[0047] (3) The heat source side of the heat pump unit is changed from facing the heat user directly to facing the energy storage device, so that the energy storage device faces the heat user, which alleviates the impact of temperature fluctuations on the main process cooling and makes the main process cooling more stable.

[0048] (4) The system automatically detects and transmits equipment and valve status and related data remotely, provides dual power supply from solar energy and mains power, links weather forecasts to light intensity, and realizes automated operation and intelligent control of the energy storage system through software programming, thereby improving the reliability and economy of the system operation. Attached Figure Description

[0049] Figure 1 Diagram of the main process refrigeration system;

[0050] Figure 2 Diagram of an automatic energy storage system;

[0051] In the diagram, 1. Main equipment; 2. Refrigeration pump; 3. Evaporator; 4. Condenser; 5. Heat user; 6. Cooling pump; 7. Cooling tower; 8. First pipe end; 9. Second pipe end; 10. Third pipe end; 11. First valve; 12. Second valve; 13. Third valve; 14. Fourth valve; 15. Fifth valve; 16. Sixth valve; 17. Seventh valve; 18. Eighth valve; 19. Ninth valve; 20. Tenth valve; 21. Cut-off valve 1; 22. Cut-off valve 2; 23. Cut-off valve 3; 24. Cut-off valve 4; 25. Cut-off valve 5; 26. Cut-off valve 6; 27. Cut-off valve 7; 28. Cut-off valve 8; 29. ​​Cut-off valve 9; 30. Cut-off valve 10; 31. Stop valve 1; 32. Stop valve 2; 33. Stop valve 3; 34. Secondary side of plate heat exchanger; 35. Primary side of plate heat exchanger; 36. Energy release pump; 37. Storage tank; 38. Bypass valve. Detailed Implementation

[0052] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0053] In this invention, a dual-condition unit is selected. In heating condition, the condenser outlet water temperature is 50℃~65℃ and the evaporator outlet water temperature is 11℃~13℃; in cooling condition, the evaporator outlet water temperature is 4℃~13℃ and the condenser outlet water temperature is 30℃~35℃.

[0054] An embodiment of the present invention discloses an automatic energy storage device for a uranium enrichment plant, such as... Figure 2 As shown, it includes: main process refrigeration system, storage tank 37, plate heat exchanger, photovoltaic power station and detection and control system;

[0055] The storage tank 37 can store heat or cold;

[0056] The plate heat exchanger is short for plate heat exchanger, which includes the primary side 35 and the secondary side 34 of the plate heat exchanger;

[0057] The motors of the energy release pump 36, the refrigeration pump 2, and the cooling pump 6 are each equipped with frequency converters;

[0058] The photovoltaic power station provides power to the compressor of the refrigeration unit;

[0059] The inlet of the secondary side 34 of the plate heat exchanger is connected to the second pipe end 9, and the second pipe end 9 is then connected to the outlet of the refrigeration pump 2. A check valve 32 is installed on the pipe connecting the second pipe end 9 and the outlet of the refrigeration pump 2.

[0060] The outlet of the secondary side of the plate heat exchanger 34 is connected to the inlet of the second valve 12 and the outlet of the third valve 13, respectively. A shut-off valve 30 and a stop valve 31 are installed on the pipeline connecting the outlet of the secondary side of the plate heat exchanger 34 and the inlet of the second valve 12. The outlet of the stop valve 31 is then connected to the third pipe end 10. A stop valve 33 is installed on the pipeline connecting the outlet of the stop valve 31 and the third pipe end 10. A bypass valve 38 is installed on the pipeline connecting the outlet of the secondary side of the plate heat exchanger 34 and the outlet of the third valve 13.

[0061] The outlet of the plate heat exchanger primary side 35 is connected to the inlet of the cooling pump 6, and a shut-off valve 28 is installed on the pipe connecting the outlet of the plate heat exchanger primary side 35 and the inlet of the cooling pump 6.

[0062] The bottom end of the storage tank 37 is connected to the outlet of the first stop valve 31, the inlet of the primary side of the plate heat exchanger 35, and the outlet of the primary side of the plate heat exchanger 35. A fifth stop valve 25 and a ninth stop valve 29 are installed on the pipe connected to the outlet of the first stop valve 31 at the bottom end of the storage tank 37. A third stop valve 23 and an energy release pump 36 are installed on the pipe connected to the inlet of the primary side of the plate heat exchanger 35 at the bottom end of the storage tank 37. A second stop valve 22 is installed on the pipe connected to the outlet of the primary side of the plate heat exchanger 35 at the bottom end of the storage tank 37.

[0063] The upper end of the storage tank 37 is connected to the outlet of the ninth valve 29, the first pipe end 8, and the inlet of the eighth valve 28. A sixth valve 26 is installed on the pipe connecting the upper end of the storage tank 37 to the outlet of the ninth valve 29. The outlet of the ninth valve 29 is also connected to the inlet of the energy release pump 36 and a seventh valve 27 is installed thereon. A fourth valve 24 is installed on the pipe connecting the upper end of the storage tank 37 to the first pipe end 8. A first valve 21 is installed on the pipe connecting the upper end of the storage tank 37 to the inlet of the eighth valve 28.

[0064] The compressor motor of the refrigeration unit is connected to the photovoltaic power station; the photovoltaic power station is equipped with a light intensity detection sensor to detect the output current of the photovoltaic power generation in real time, and the detection data is transmitted to the detection and control system.

[0065] When acquiring light intensity data, add a light intensity acquisition and detection module in the configuration control hardware tree, set the slot address, configure the channel parameters, set the signal type to photoresistor, set the light intensity detection sensor to a photodiode, and set the range to 380~780nm. When the light intensity increases, the resistance value of the photodiode decreases and the current increases. The corresponding channel acquires the resistance value of the photodiode, automatically performs linearization processing to convert it into a current value (A), and displays the current value through fiber optic cable and the monitoring interface of the process station on the computer terminal.

[0066] The detection and control system collects real-time operating data of the energy release pump 36, the refrigeration pump 2, the cooling pump 6, the output current of the photovoltaic power station, and the opening data of each valve. Based on the temperature and energy status, it automatically adjusts the operating data of the energy release pump 36, the refrigeration pump 2, the cooling pump 6, the switching between the photovoltaic power station and the power grid, and the opening of each valve to achieve heat storage, heat release, cold storage, and cold release.

[0067] The detection and control system includes a computer terminal and a process station;

[0068] The process station is used to collect data from monitoring points, including various pumps, valves, and the photovoltaic power station. The data from the monitoring points includes: the operating data of each pump, the output current of the photovoltaic power station, and the opening data of each valve. The operating data includes the pump's frequency, operating status, current, and voltage.

[0069] After data collection, the data signal is converted via RS485 using the MODBUS / RTU protocol and then transmitted to the process station in the control room via optical fiber. The process station is then connected to a computer terminal, where software programming is used to remotely control and operate each monitoring node on site, thereby achieving automated operation.

[0070] Meanwhile, the process station also has basic PID regulation and control functions. Specifically, the process station calculates the set value and the collected value, and controls each monitoring node to make the collected value infinitely close to the set value; the collected data is uploaded to the computer terminal in real time.

[0071] Each valve has a corresponding positioning slot address in the process station. A 4-20mA analog signal is input as the electric valve drive signal, where 4mA corresponds to 0% opening, representing the valve is fully closed, and 20mA corresponds to 100%, representing the valve is fully open. The valve status is transmitted to the process station via optical fiber, and the process station controls it.

[0072] The process station also receives advanced control commands from the computer terminal to control each monitoring node.

[0073] The computer terminal includes an energy storage operation model, a display module, and an advanced control module;

[0074] The computer terminal is equipped with a wireless network card, which is linked to historical data of solar power generation and weather forecasts; software control programs are written in the computer terminal to establish an energy storage operation model;

[0075] The energy storage operation model includes a summer operation model and a winter operation model;

[0076] The summer operation model is based on historical solar power generation data and weather forecasts. When the daytime sunshine duration exceeds 4 hours and the predicted sunshine duration for the next day is also expected to exceed 4 hours, the photovoltaic power station supplies power to the chiller and related pumps, storing cold in storage tank 37. At night, the chiller is shut down, and storage tank 37 supplies cooling to the main equipment 1. When the daytime sunshine duration is less than 4 hours and the predicted sunshine duration for the next day is also expected to be less than 4 hours, or on a cloudy day, the photovoltaic power station supplies power to the chiller and related water pumps, storing cold in storage tank 37 without releasing cold. The winter operation model is based on the municipal power grid supplying power to the chiller and related water pumps. During the day, the chiller's evaporator 3 generates cold to supply cooling to the main equipment 1, while the condenser 4 generates heat, storing heat in storage tank 37. At night, the chiller is shut down, and cooling to the main equipment 1 is provided through cooling tower 7 combined with plate heat exchangers, while storage tank 37 provides heat to heat users.

[0077] A communication protocol is established between the power supply of the refrigeration unit and related pumps and the solar power intensity. When the solar intensity is insufficient to support the cold and heat storage of the refrigeration unit, the power supply of the refrigeration unit is switched to the municipal power grid.

[0078] The advanced control module is used to determine whether to execute heat storage, heat release, cold storage, or cold release programs based on the energy storage operation model and the actual external temperature. It issues adjustment commands and schemes to the process station and realizes heat storage, heat release, cold storage, and cold release by automatically adjusting the operating data of the energy release pump 36, the refrigeration pump 2, the cooling pump 6, the switching between the photovoltaic power station and the grid, and the opening of each valve.

[0079] The display module is used to display the collected data and control scheme of each monitoring point.

[0080] An embodiment of the present invention discloses an automatic energy storage method for a uranium enrichment plant. By using the energy storage device described in the above technical solution, the refrigeration unit can store cold in the summer when there is sufficient solar energy, and store heat in the winter when there is insufficient solar energy by utilizing the municipal power grid and the waste heat from the operation of the main equipment.

[0081] The energy storage and release are set according to the temperature-triggered scheduling algorithm. The period when the outdoor minimum temperature is consistently above 15°C after sunrise is set as the cold storage period. When the temperature reaches 15°C after sunrise, the refrigeration unit automatically operates in cooling mode. Evaporator 3 produces chilled water to supply storage tank 37 for cold storage, and condenser 4 dissipates heat through cooling tower 7. The period after sunset is set as the cold release period. The refrigeration unit stops operating, and cooling pump 6 and energy release pump 36 automatically start. Storage tank 37 begins to release cold, supplying cooling to main equipment 1. The period when the outdoor maximum temperature is below 10°C is set as the heat storage period. When the outdoor temperature is above 0°C, the refrigeration unit automatically operates in heating mode. Evaporator 3 produces chilled water to supply main equipment 1 to remove the heat generated by the main equipment. Condenser 4 produces 65°C hot water and stores it in storage tank 37. The period when the outdoor temperature is below 0°C is set as the heat release period. The refrigeration unit stops operating, and cooling pump 6 and energy release pump 36 automatically start. Storage tank 37 releases heat.

[0082] During the cold storage period, when the minimum solar irradiance reaches the starting current of cooling pump 6, cooling pump 6 automatically starts running. As the irradiance gradually increases and reaches the starting current of chilled water pump 2, chilled water pump 2 automatically starts running. When the irradiance further increases and reaches the starting current of the chiller unit, the chiller unit automatically starts and gradually loads, and chilled water produced by evaporator 3 enters storage tank 37 to begin cold storage. As the irradiance begins to weaken, the chiller unit automatically reduces its load until the irradiance can no longer support the operation of the chiller unit, at which point the chiller unit automatically stops running. Subsequently, cooling pump 6 automatically stops, the power supply of chilled water pump 2 automatically switches to the municipal power grid, energy release pump 36 automatically starts, and storage tank 37 begins to release cold.

[0083] During the cold storage period, the specific operation mode is as follows: valves 11, 12, 32, 33, 31, 27, 26, 23, 22, and 21 are closed; valves 30, 29, 25, and 24 are open; the chilled water pump 2 is running; and the water cooled by the evaporator 3 enters the storage tank 37 for storage. Valve 14, 17, and 18 are closed; valves 15, 16, 20, and 19 are open; the cooling pump 6 is running; and the cooling tower 7 dissipates heat from the condenser 4.

[0084] The chilled water pump 2 provides power to the water passing through the storage tank 37 and the evaporator 3. The water passes sequentially through the interface at the upper end of the storage tank 37, the fourth valve 24, the chilled water pump 2, the evaporator 3, the tenth valve 30, the ninth valve 29, and the fifth valve 25 into the bottom end of the storage tank 37. The cooling pump 6 provides power to the water inlet and outlet of the condenser 4. The water passes sequentially through the cooling tower 7, the ninth valve 19, the cooling pump 6, the inlet of the condenser 4, the fifth valve 15, the sixth valve 16, and the tenth valve 20, and returns to the cooling tower 7.

[0085] During the cooling release period, the specific operating mode is as follows: valves 22, 25, 27, 28, 24, and 26 are closed, while valves 23 and 21 are open. The energy release pump 36 is powered by the municipal power grid, and the primary side of the heat exchanger 35 releases cooling through heat exchange with the secondary side of the heat exchanger 34. Valve 14, 13, 38, 29, and 33 are closed, while valves 32, 31, 30, 12, and 11 are open. The chilled pump 2 automatically switches to power supply from the municipal power grid, and the secondary side of the heat exchanger 34 supplies cooling to the main operating equipment 1 through heat exchange with the primary side of the heat exchanger 35.

[0086] The energy release pump 36 provides power for the water passing through the storage tank 37 and the primary side of the plate heat exchanger 35. The water passes sequentially through the interface at the bottom of the storage tank 37, the third shut-off valve 23, the energy release pump 36, the primary side of the plate heat exchanger 35, the first shut-off valve 21, and returns to the interface at the top of the storage tank 37. The chilled water pump 2 provides power for the water entering the main equipment 1 and the secondary side of the plate heat exchanger 34. The water passes sequentially through the outlet of the main equipment 1, the first valve 11, the chilled water pump 2, the second shut-off valve 32, the secondary side of the plate heat exchanger 34, the first shut-off valve 31, the tenth shut-off valve 30, the second valve 12, and returns to the inlet of the main equipment 1.

[0087] During the heat storage period, the specific operating mode is as follows: stop valve 2 32, stop valve 10 30, and stop valve 4 24 are closed, valve 11 and valve 2 12 are open, the chilled pump 2 is running, and the evaporator 3 directly supplies cooling to the main equipment 1; valve 7 17, valve 5 15, valve 4 14, stop valve 1 31, stop valve 7 27, stop valve 5 25, stop valve 1 21, stop valve 3 23, valve 8 18, and valve 9 19 are closed, stop valve 3 33, stop valve 9 29, stop valve 6 26, stop valve 2 22, and stop valve 8 28 are open, the cooling pump 6 is running, and the condenser 4 produces 65°C hot water which enters the storage tank 37 for storage.

[0088] The chilled water pump 2 provides power for the water circulating in the main equipment 1 and the evaporator 3. The water passes through the outlet of the main equipment 1, the first valve 11, the chilled water pump 2, the evaporator 3, the second valve 12, and returns to the inlet of the main equipment 1. The cooling pump 6 provides power for the water circulating in the storage tank 37 and the condenser 4. The water passes through the interface at the bottom of the storage tank 37, the second shut-off valve 22, the eighth shut-off valve 28, the cooling pump 6, the condenser 4, the third shut-off valve 33, the ninth shut-off valve 29, the sixth shut-off valve 26, and returns to the interface at the top of the storage tank 37.

[0089] During the heat release period, the specific operating mode is as follows: valves 21 (stop 1), 24 (stop 4), 25 (stop 5), 29 (stop 9), and 23 (stop 3) are closed; valves 26 (stop 6), 27 (stop 7), and 22 (stop 2) are open; the energy release pump 36 operates, supplying heat to the secondary side 34 of the plate heat exchanger through the primary side 35; valves 16 (stop 3), 33 (stop 2), 32 (stop 3), 13 (stop 1), 31 (stop 1), 20 (stop 10), 19 (stop 9), and 28 (stop 8) are closed; valves 17 (stop 7), 15 (stop 5), 14 (stop 4), 38 (bypass valve), and 18 (stop 8) are open; the cooling pump 6 operates, supplying heat to the heat user 5 through the secondary side 34 of the plate heat exchanger.

[0090] The energy release pump 36 provides power for the water circulating in the storage tank 37 and the primary side of the heat exchanger 35. The water passes sequentially through the upper end interface of the storage tank 37, the sixth shut-off valve 26, the seventh shut-off valve 27, the energy release pump 36, the primary side of the heat exchanger 35, the second shut-off valve 22, and returns to the bottom end interface of the storage tank 37. The cooling pump 6 provides power for the water circulating in the secondary side of the heat exchanger 34 and the heat user. The water passes through the outlet of the heat user 5, sequentially through the eighth valve 18, the cooling pump 6, the seventh valve 17, the fifth valve 15, the fourth valve 14, the secondary side of the heat exchanger 34, the bypass valve 38, and returns to the heat user 5.

[0091] Using the energy storage device described in the above technical solution, it is possible to ensure that low-temperature water is always in the lower layer and high-temperature water is always in the upper layer, regardless of whether it is storing or releasing heat or storing or releasing cold. This achieves natural stratification of the energy storage water body, avoids disturbances in the energy storage and release process, and improves the energy storage and release efficiency. Specifically, by connecting the bottom end of storage tank 37 to the outlet of stop valve 31 and the top end of storage tank 37 to the first pipe end 8, low-temperature water can enter at a low temperature and high-temperature water can exit at a high temperature during cold storage; by connecting the bottom end of storage tank 37 to the inlet of plate changer 35 and the outlet of plate changer 35, and the top end of storage tank 37 to the inlet of stop valve 22, low-temperature water can exit at a low temperature and high-temperature water can enter at a high temperature during cold release; by connecting the top end of storage tank 37 to the outlet of stop valve 29 and the inlet of stop valve 22, and the inlet of stop valve 21, and the inlet of cooling pump 6, high-temperature water can enter at a high temperature and low-temperature water can exit at a low temperature during heat storage; by connecting the top end of storage tank 37 to the outlet of stop valve 29 and the outlet of stop valve 26, and the inlet of energy release pump 36, and the bottom end of storage tank 37 to the outlet of plate changer 35, high-temperature water can exit at a high temperature and low-temperature water can enter at a low temperature during heat release.

[0092] Using the energy storage device described in the above technical solution, it is also possible to store heat and supply heat simultaneously. Specifically, stop valve 2 32, stop valve 10 30, and stop valve 4 24 are closed, and valves 11 and 2 are open. The chilled pump 2 is running, and the evaporator 3 directly supplies cooling to the main equipment 1. Valve 7 17, valve 5 15, stop valve 1 31, bypass valve 38, stop valve 7 27, stop valve 5 25, stop valve 3 23, stop valve 1 21, and valve 9 19 are closed, and valves 4 14, 3 valve 13, stop valve 3 33, stop valve 9 29, stop valve 6 26, stop valve 2 22, stop valve 8 28, and valve 8 18 are open. The cooling pump 6 is running, and the condenser 4 produces hot water at 65°C, which is supplied to the storage tank 37 and the heat user 5 respectively, thus realizing heat storage and heat supply simultaneously.

[0093] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0094] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for automatic energy storage in a uranium enrichment plant, characterized in that, The utility model relates to a kind of energy storage and release system, including: Main process refrigeration system, storage tank (37), plate exchanger, photovoltaic power station and detection control system; The plate exchanger includes plate exchanger primary side (35) and plate exchanger secondary side (34); The plate exchanger secondary side (34) import is connected with second pipe end (9), and the second pipe end (9) is connected with the outlet of refrigeration pump (2) again;The outlet of plate exchanger secondary side (34) is connected with the import of second valve (12) and the outlet of third valve (13) respectively;Stop one valve (31) is arranged on the pipeline connected with the import of second valve (12) of the outlet of plate exchanger secondary side (34), and the outlet of stop one valve (31) is connected with third pipe end (10) again; The outlet of plate exchanger primary side (35) is connected with the import of cooling pump (6);Stop eight valve (28) is arranged on the pipeline connected with the import of cooling pump (6) of the outlet of plate exchanger primary side (35). The bottom of storage tank (37) is connected with the outlet of plate exchanger secondary side (34), the import of plate exchanger primary side (35) and the pipeline of the outlet of plate exchanger primary side (35) respectively, and stop nine valve (29) is arranged on the pipeline connected with the outlet of stop one valve (31) of the bottom of storage tank (37); Energy release pump (36) is arranged on the pipeline connected with the import of plate exchanger primary side (35) of the bottom of storage tank (37); The upper end of storage tank (37) is connected with the outlet of stop nine valve (29), first pipe end (8) and the import of stop eight valve (28) respectively; The compressor set of main process refrigeration system is connected with photovoltaic power station; The motor of energy release pump (36), refrigeration pump (2) and cooling pump (6) is respectively configured frequency converter; The detection control system collects the running data of energy release pump (36), refrigeration pump (2) and cooling pump (6), the output current of photovoltaic power station and the opening data of each valve in real time, and according to temperature and energy state, automatically adjusts the running data of energy release pump (36), refrigeration pump (2) and cooling pump (6), the switching of photovoltaic power station and power grid and the opening of each valve, realizes heat storage, heat release, cold storage and cold release.

2. The device for automatic energy storage of a uranium enrichment plant according to claim 1, characterized in that Stop two valve (32) is arranged on the pipeline connected with the outlet of refrigeration pump (2) of second pipe end (9); Stop ten valve (30) and stop one valve (31) are arranged on the pipeline connected with the import of second valve (12) of the outlet of plate exchanger secondary side (34), and stop three valve (33) is arranged on the pipeline connected with third pipe end (10) of the outlet of stop one valve (31); Bypass valve (38) is arranged on the pipeline connected with the outlet of third valve (13) of the outlet of plate exchanger secondary side (34). Stop five valve (25) and stop nine valve (29) are arranged on the pipeline connected with the outlet of stop one valve (31) of the bottom of storage tank (37); Stop two valve (22) is arranged on the pipeline connected with the outlet of plate exchanger primary side (35) of the bottom of storage tank (37). Stop six valve (26) is arranged on the pipeline connected with the outlet of stop nine valve (29) of the upper end of storage tank (37), and stop nine valve (29) outlet is connected with the import of energy release pump (36) again, and stop seven valve (27) is arranged;Stop four valve (24) is arranged on the pipeline connected with first pipe end (8) of the upper end of storage tank (37);Stop one valve (21) is arranged on the pipeline connected with the import of stop eight valve (28) of the upper end of storage tank (37).

3. The device for automatic energy storage in a uranium enrichment plant according to claim 1, characterized in that, The photovoltaic power station is provided with an illumination intensity detection sensor, which detects photovoltaic power generation output current in real time, and the detection data is transmitted to the detection control system.

4. The device for automatic energy storage of a uranium enrichment plant according to claim 3, characterized in that The detection control system comprises a computer terminal and a process station; The process station is used for collecting data of monitoring points and uploading the data to the computer terminal, receiving control commands of the computer terminal and executing adjustment of the monitoring points according to the control commands, and performing PID adjustment control on the monitoring points; The computer terminal is used for receiving data collected by the process station, judging to execute heat storage, heat release, cold storage or cold release program according to an energy storage operation model and actual temperature of the outside world, and issuing adjustment commands to the process station.

5. The device for automatic energy storage of a uranium enrichment plant according to claim 4, characterized in that The computer terminal comprises an energy storage operation model, a display module and a high-level control module; The display module is used for displaying collected data of each monitoring point and a control scheme; The high-level control module is used for judging to execute heat storage, heat release, cold storage or cold release program according to an energy storage operation model and actual temperature of the outside world, and issuing adjustment commands and a scheme to the process station; The energy storage operation model comprises a summer operation model and a winter operation model; The summer operation model is based on historical data of solar power generation and weather forecast, when the daytime illumination time is more than 4 hours and the predicted next-day illumination time is still more than 4 hours, the photovoltaic power station supplies power to a refrigerating unit and related pumps, and stores cold in a storage tank (37), at night, the refrigerating unit is stopped, and the storage tank (37) supplies cold to main equipment; when the daytime illumination time is less than 4 hours and the predicted next-day illumination time is still less than 4 hours or it is cloudy, the photovoltaic power station supplies power to the refrigerating unit and related pumps, and the storage tank (37) stores cold without releasing cold; the winter operation model is that a municipal power grid supplies power to the refrigerating unit and related pumps, at daytime, the refrigerating unit evaporator (3) produces cold to supply cold to main equipment, and the condenser (4) produces heat, the storage tank (37) stores heat, at night, the refrigerating unit is stopped, main equipment is supplied with cold through a cooling tower (7) and a plate heat exchanger, and the storage tank (37) supplies heat to hot users.

6. The device for automatic energy storage of a uranium enrichment plant according to claim 1, characterized in that, The low-temperature water of the storage tank (37) is always in the lower layer, and the high-temperature water is always in the upper layer, so that the energy storage water body is naturally stratified and does not disturb each other in the process of energy storage and release.

7. A method for automatic energy storage in an enrichment plant based on the energy storage device according to any one of claims 1 to 6, characterized in that The method comprises the following steps: According to the temperature trigger scheduling algorithm, the energy storage and release is set. The period when the outdoor minimum temperature is higher than 15℃ after sunrise is set as the cold storage period. When the temperature reaches 15℃ after sunrise, the refrigeration unit automatically runs in the refrigeration mode, the evaporator (3) produces chilled water to supply the storage tank (37) for cold storage, and the condenser (4) dissipates heat through the cooling tower (7). The period after sunset is set as the cold release period, the refrigeration unit stops running, the cooling pump (6) and the energy release pump (36) automatically start, the storage tank (37) starts to release cold to supply the main equipment (1); the period when the outdoor maximum temperature is lower than 10℃ is set as the heat storage period. When the outdoor temperature is higher than 0℃, the refrigeration unit automatically runs in the heating mode, the evaporator (3) produces chilled water to supply the main equipment (1) to take away the heat generated by the main equipment, and the condenser (4) produces 65℃ hot water stored in the storage tank (37). When the outdoor temperature is lower than 0℃, it is set as the heat release period, the refrigeration unit stops running, the cooling pump (6) and the energy release pump (36) automatically start, and the storage tank (37) releases heat.

8. The method of automatic energy storage for a uranium enrichment plant according to claim 7, characterized in that, In the cold storage period, when the minimum solar illumination intensity reaches the starting current of the cooling pump (6), the cooling pump (6) automatically starts running. As the illumination intensity gradually increases to the starting current of the refrigeration pump (2), the refrigeration pump (2) automatically runs. When the illumination intensity further increases to the starting current of the refrigeration unit, the refrigeration unit automatically starts and gradually loads to run. The evaporator (3) produces chilled water to enter the storage tank (37) to start cold storage. As the illumination intensity begins to weaken, the refrigeration unit automatically reduces the load to run until the illumination intensity cannot support the operation of the refrigeration unit, and the refrigeration unit automatically stops running. Then the cooling pump (6) automatically stops running, the power supply of the refrigeration pump (2) is automatically switched to the municipal power grid, and the energy release pump (36) automatically starts, and the storage tank (37) starts to release cold.

9. The method of automatic energy storage for a uranium enrichment plant of claim 7, wherein, In the cold storage period, the specific operation mode is: the first valve (11), the second valve (12), the third valve (32), the fourth valve (33), the fifth valve (31), the sixth valve (27), the seventh valve (26), the eighth valve (23), the ninth valve (22), and the tenth valve (21) are closed, the eleventh valve (30), the twelfth valve (29), the thirteenth valve (25), and the fourteenth valve (24) are opened, the refrigeration pump (2) runs, and the water cooled by the evaporator (3) enters the storage tank (37) for storage; the fifteenth valve (14), the sixteenth valve (17), and the seventeenth valve (18) are closed, the eighteenth valve (15), the nineteenth valve (16), the twentieth valve (20), and the twenty-first valve (19) are opened, and the cooling pump (6) runs. The cooling tower (7) dissipates heat for the condenser (4).

10. The method of automatic energy storage for a uranium enrichment plant of claim 7, wherein, The cold releasing period, the specific operation mode is: intercepts two valves (22), intercepts five valves (25), intercepts seven valves (27), intercepts eight valves (28), intercepts four valves (24), intercepts six valves (26) are closed, intercepts three valves (23), intercepts one valve (21) is opened, and the release energy pump (36) is powered by the municipal power grid and operates, and the plate exchange primary side (35) releases cold by heat exchange with the plate exchange secondary side (34);Fourth valve (14), third valve (13), bypass valve (38), intercept nine valves (29), stop three valves (33) are closed, stop two valves (32), stop one valve (31), intercept ten valves (30), second valve (12), first valve (11) are opened, and the refrigeration pump (2) is automatically switched to the municipal power grid and operates, and the plate exchange secondary side (34) is cooled to the running main equipment (1) by heat exchange with the plate exchange primary side (35).

11. The method of automatic energy storage for a uranium enrichment plant of claim 7, wherein, The heat storage period, the specific operation mode is: stop two valves (32), intercept ten valves (30), intercept four valves (24) are closed, first valve (11), second valve (12) are opened, refrigeration pump (2) operates, and the evaporator (3) directly supplies cold to the main equipment (1);Seventh valve (17), fifth valve (15), fourth valve (14), stop one valve (31), intercept seven valves (27), intercept five valves (25), intercept one valve (21), intercept three valves (23), eighth valve (18), ninth valve (19) are closed, stop three valves (33), intercept nine valves (29), intercept six valves (26), intercept two valves (22), intercept eight valves (28) are opened, and the cooling pump (6) operates, and the condenser (4) produces 65 DEG C hot water into the storage tank (37) and stores.

12. The method of automatic energy storage for a uranium enrichment plant of claim 7, wherein, The heat releasing period, the specific operation mode is: intercept one valve (21), intercept four valves (24), intercept five valves (25), intercept nine valves (29), intercept three valves (23) are closed, intercept six valves (26), intercept seven valves (27), intercept two valves (22) are opened, and the release energy pump (36) operates, and the plate exchange primary side (35) is heated to the plate exchange secondary side (34);Sixth valve (16), stop three valves (33), stop two valves (32), third valve (13), stop one valve (31), tenth valve (20), ninth valve (19), intercept eight valves (28) are closed, seventh valve (17), fifth valve (15), fourth valve (14), bypass valve (38), eighth valve (18) are opened, and the cooling pump (6) operates, and the plate exchange secondary side (34) is heated to the hot user (5).

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