System and method for drying a new centrifuge

Abstract

The present application relates to the field of energy saving, in particular to a system and method for drying new centrifuge. The system comprises: a new centrifuge, a hot water pump and a plate heat exchanger secondary side forming a circulation loop; a first evaporator outlet is connected to the inlet of a running centrifuge and a second evaporator outlet respectively, a refrigeration pump is arranged at the inlet of the first evaporator, the inlet of the refrigeration pump is connected to the outlet of the running centrifuge, and the outlet of the refrigeration pump is connected to the inlet of the second evaporator; a cooling tower outlet is connected to the inlet of a second condenser, a cooling pump is arranged on the pipeline connecting the cooling tower outlet and the second condenser inlet; the cooling tower inlet is connected to the outlet of a plate heat exchanger primary side and the outlet of a first condenser respectively; the first condenser, the plate heat exchanger primary side and a high temperature pump form a circulation loop; temperature sensors are arranged at the inlets of the new centrifuge and the running centrifuge respectively; an automatic control system collects the data of each pump and temperature sensor in real time and automatically adjusts the operation data of each pump. The present application improves the energy utilization efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy saving, in particular to a system and method for drying new centrifuges. BACKGROUND

[0002] The main equipment for uranium enrichment production is a centrifuge, which must be dried in batches after installation and cooled by a refrigerator after operation. Both drying and cooling are indirectly performed by using desalted and deoxygenated water through the outer sleeve of the centrifuge. The process requires that the water temperature be controlled within the range of 60-63 DEG C during drying of the centrifuge and within the range of 11-15 DEG C during cooling of the centrifuge. The water temperature control is entirely dependent on manual operation, which is not only inefficient but also requires a large amount of work from the workers.

[0003] Up to now, the heat source for drying is obtained from an electric boiler or a coal-fired boiler, and a separate boiler room is configured. During the entire life cycle after operation of the centrifuge, the drying equipment and facilities are no longer used. Based on the consideration of land occupation and investment cost control, the drying system can at most be configured to simultaneously heat 6-8 sections of the centrifuge group.

[0004] After the centrifuge is started, a separate cooling system is usually used to remove the heat generated during operation of the centrifuge. The cooling source is obtained from an evaporator of a refrigeration unit. The refrigeration unit is selected to be a dual-condition unit that can both refrigerate and heat. SUMMARY

[0005] The present application solves the technical problem of providing a system and method for drying new centrifuges, using a running centrifuge to replace an electric boiler, solving the problem of waste of equipment and land resources caused by long-term idling of the original drying system equipment and facilities after use, using the heat generated by the running centrifuge to dry the centrifuge before operation, improving the energy utilization efficiency, not limiting the number of heated centrifuge groups at one time, improving the drying capacity and ability, shortening the construction period, using the refrigeration unit in the refrigeration condition to adjust and control the refrigeration unit in the heating condition, ensuring that the cooling effect of the running centrifuge is not affected, and reducing the production cost.

[0006] The present application provides a system for drying new centrifuges, comprising:

[0007] A circulating loop is formed by the new centrifuge, the hot water pump and the secondary side of the plate heat exchanger.

[0008] The first evaporator outlet is connected to the inlet of the running centrifuge and the outlet of the second evaporator, respectively. A refrigeration pump is arranged at the inlet of the first evaporator. The inlet of the refrigeration pump is connected to the outlet of the running centrifuge. The outlet of the refrigeration pump is connected to the inlet of the second evaporator.

[0009] The outlet of the cooling tower is connected to the inlet of the second condenser. A cooling pump is arranged on the pipeline connecting the outlet of the cooling tower and the inlet of the second condenser.

[0010] The cooling tower inlet is connected with the plate exchanger primary side outlet and the first condenser outlet respectively;

[0011] The first condenser, the plate exchanger primary side and the high-temperature pump constitute a circulation loop;

[0012] A first temperature sensor is arranged at the inlet of the new centrifuge, and a second temperature sensor is arranged at the inlet of the running centrifuge;

[0013] The automatic control system collects data of each pump and temperature sensor in real time and automatically adjusts the operation data of each pump.

[0014] As a further technical solution, the first evaporator outlet is connected with the inlet of the new centrifuge and the outlet of the plate exchanger secondary side through a main pipeline respectively;

[0015] An eighth valve is arranged on the main pipeline, and the inlet of the eighth valve is connected with the inlet of the running centrifuge again;

[0016] The second evaporator outlet is connected to the main pipeline;

[0017] The first evaporator inlet is connected with the outlet of the new centrifuge, and a fifth valve and a refrigeration pump are arranged on the pipeline connecting the first evaporator inlet with the outlet of the new centrifuge in sequence, and the inlet of the fifth valve is connected with the inlet of the hot water pump again.

[0018] As a further technical solution, the outlet of the plate exchanger secondary side is connected with the inlet of the new centrifuge, the inlet of the plate exchanger secondary side is connected with the outlet of the new centrifuge, and a hot water pump is arranged on the pipeline connecting the inlet of the plate exchanger secondary side with the outlet of the new centrifuge.

[0019] As a further technical solution, a ninth valve is arranged on the pipeline connecting the cooling tower inlet with the plate exchanger primary side outlet, the inlet of the ninth valve is connected with the outlet of the second condenser again, a fourth valve is arranged on the outlet pipeline of the second condenser, the inlet of the fourth valve is connected with the outlet of the sixth valve again, the outlet of the fourth valve is connected with the outlet of the cooling pump, a first valve and a high-temperature pump are arranged on the pipeline connecting the outlet of the fourth valve with the outlet of the cooling pump, the outlet of the first valve is connected with the inlet of the first condenser again, the inlet of the plate exchanger primary side is connected with the inlet of the sixth valve, and a seventh valve is arranged on the pipeline connecting the inlet of the plate exchanger primary side with the inlet of the sixth valve; a third valve is arranged on the pipeline connecting the outlet of the first valve with the inlet of the first condenser;

[0020] The automatic control system also collects data of each valve in real time and automatically adjusts the opening degree of each valve.

[0021] As a further technical solution, a third temperature sensor is arranged on the pipeline connecting the inlet of the ninth valve with the outlet of the fourth valve.

[0022] As a further technical solution, the automatic control system comprises a process station and a computer terminal:

[0023] 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; the monitoring points include various pumps, valves, cooling towers and temperature sensors.

[0024] The computer terminal is used to receive data collected by the process station and to issue adjustment commands to the process station based on the collected temperature data.

[0025] This invention provides a method for drying a newly assembled centrifuge based on the aforementioned device, comprising the following steps:

[0026] The refrigeration unit connected to the first evaporator is set to operate in heating mode, and the refrigeration unit connected to the second evaporator is set to operate in cooling mode. The cooling water produced by the first and second evaporators is used to cool the operating centrifuge. The heat generated by the second condenser is discharged into the atmosphere through the cooling tower. The heat generated by the first condenser is used to dry the newly installed centrifuge through the primary and secondary sides of the plate heat exchanger.

[0027] As a further technical solution, the outlet water temperature of the first condenser is set as the drying requirement temperature, and the outlet water temperature of the second evaporator is set as the cooling requirement temperature. The eighth and fifth valves are closed, the chilled water pump is running, and the cooling water passes through the first and second evaporators to cool the operating centrifuges. The first, fourth, sixth, and ninth valves are closed, the second valve is opened, the cooling pump is running, and the second condenser dissipates heat through the cooling tower. The third and seventh valves are opened, the high-temperature pump is running, and the high-temperature hot water produced by the first condenser is sent to the primary side of the plate heat exchanger through the high-temperature pump. The hot water pump is running, and the secondary side of the plate heat exchanger dries the newly installed centrifuges through heat exchange with the primary side of the plate heat exchanger.

[0028] As a further technical solution, during the drying process of the newly installed centrifuge, the water supply temperature of the centrifuge is controlled within the range of 11℃~15℃, the water supply temperature of the newly installed centrifuge is controlled within the range of 60℃~63℃, and the inlet water temperature of the first condenser is controlled within the range of 50℃~55℃. When controlling the inlet water temperature of the first condenser, the hot water circulation volume is kept constant. The hot water circulation refers to the hot water circulation that runs in the loop formed by the first condenser, the seventh valve, the primary side of the plate heat exchanger, the high-temperature pump, and the third valve.

[0029] As a further technical solution, the second evaporator automatically tracks the temperature change of the second temperature sensor and automatically adjusts its own temperature to keep the water supply temperature of the centrifuge within the range of 11℃ to 15℃.

[0030] As a further technical solution, the first condenser automatically tracks the temperature change of the first temperature sensor and automatically adjusts its own temperature to keep the water supply temperature of the newly installed centrifuge within the range of 60℃ to 63℃.

[0031] As a further technical solution, if the inlet water temperature of the first condenser exceeds 55°C, then the fourth and ninth valves are opened.

[0032] According to the formula The adjustment is performed, where t represents the inlet water temperature of the first condenser, m1 represents the flow rate at the corresponding opening degree of the fourth valve, t1 represents the outlet water temperature of the second condenser, m2 represents the flow rate at the operating frequency of the high-temperature pump, and t2 represents the temperature of the third temperature sensor.

[0033] As a further technical solution, a communication protocol is set between the fourth valve and the ninth valve, so that the fourth valve and the ninth valve open or close synchronously and keep the opening degree consistent to ensure that the hot water circulation volume remains unchanged.

[0034] Compared with the prior art, the system and method for drying a newly assembled centrifuge of the present invention have the following beneficial effects:

[0035] (1) The heat generated by the centrifuge itself is used to dry the centrifuge before operation, replacing the electric boiler drying system, saving initial investment and land resources, and improving energy utilization efficiency.

[0036] (2) The drying system equipment is no longer idle for a long time and can continue to serve the centrifuge cooling system, which reduces investment costs.

[0037] (3) Taking advantage of the fact that the heat generated by the centrifuge is much greater than that required by the drying centrifuge, the number of drying centrifuges is unlimited, thereby improving the drying capacity and volume of the drying system.

[0038] (4) The indirect drying method ensures the quality of the water used for drying, as well as the stability of the temperature, heating rate and pressure during the drying process.

[0039] (5) The drying temperature is controlled by adjusting the condenser outlet water temperature of the chiller unit in heating mode, and the centrifuge cooling temperature is controlled by adjusting the evaporator outlet water temperature of the chiller unit in cooling mode. This makes the operation simpler, more efficient, and more precise, while ensuring the stability and reliability of the centrifuge cooling system.

[0040] (6) The fully automatic control operation not only improves the adjustment accuracy and work efficiency, but also reduces the labor intensity of workers. Attached Figure Description

[0041] Figure 1 A schematic diagram showing the system for drying newly installed centrifuges;

[0042] In the diagram: 1. Newly installed centrifuge; 2. Running centrifuge; 3. Hot water pump; 4. Refrigeration pump; 5. First evaporator; 6. First condenser; 7. Second evaporator; 8. Second condenser; 9. Cooling pump; 10. High-temperature pump; 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. Cooling tower; 21. Primary side of plate heat exchanger; 22. Secondary side of plate heat exchanger; 23. First temperature sensor; 24. Second temperature sensor; 25. Third temperature sensor. Detailed Implementation

[0043] 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.

[0044] In this invention, the refrigeration unit is a dual-mode unit that can both cool and heat. In heating mode, the condenser outlet water temperature is controllable and adjustable within the range of 50℃ to 65℃, the temperature difference between the condenser inlet and outlet water is 10℃ to 15℃, and the evaporator outlet water temperature is uncontrolled within the range of 11℃ to 13℃. In cooling mode, the evaporator outlet water temperature is controllable and adjustable within the range of 11℃ to 13℃, the temperature difference between the evaporator inlet and outlet water is 2℃, and the condenser outlet water temperature is uncontrolled within the range of 30℃ to 35℃.

[0045] The refrigeration unit in heating mode includes a first evaporator 5 and a first condenser 6, as well as a compressor and an expansion valve; the connection method of the first evaporator 5, the first condenser 6, the compressor and the expansion valve is a conventional setting;

[0046] The refrigeration unit in refrigeration mode includes a second evaporator 7 and a second condenser 8, as well as a compressor and an expansion valve; the connection method of the second evaporator 7, the second condenser 8, the compressor and the expansion valve is a conventional setting;

[0047] Embodiments of the present invention disclose a system for drying a newly assembled centrifuge, such as... Figure 1 As shown, it includes:

[0048] The newly installed centrifuge 1 and the plate heat exchanger secondary side 22 form a circulation loop, and a hot water pump 3 is installed on the circulation loop; specifically, the outlet of the plate heat exchanger secondary side 22 is connected to the inlet of the newly installed centrifuge 1, the inlet of the plate heat exchanger secondary side 22 is connected to the outlet of the newly installed centrifuge 1, and a hot water pump 3 is installed on the pipe connecting the inlet of the plate heat exchanger secondary side 22 and the outlet of the newly installed centrifuge 1.

[0049] The outlet of the first evaporator 5 is connected to the inlet of the newly installed centrifuge 1, the outlet of the secondary side of the plate heat exchanger 22, and the outlet of the second evaporator 7. An eighth valve 18 is installed on the main pipeline at the outlet of the first evaporator 5, and the inlet of the eighth valve 18 is connected to the inlet of the operating centrifuge 2. The inlet of the first evaporator 5 is connected to the outlet of the newly installed centrifuge 1. A fifth valve 15 and a chilled water pump 4 are installed sequentially on the pipeline connecting the inlet of the first evaporator 5 and the outlet of the newly installed centrifuge 1. The inlet of the chilled water pump 4 is connected to the outlet of the operating centrifuge 2, the outlet of the chilled water pump 4 is connected to the inlet of the second evaporator 7, and the inlet of the fifth valve 15 is connected to the inlet of the hot water pump 3.

[0050] The outlet of cooling tower 20 is connected to the inlet of the second condenser 8. A cooling pump 9 and a second valve 12 are installed on the pipe connecting the outlet of cooling tower 20 and the inlet of the second condenser 8. The inlet of cooling tower 20 is connected to the outlet of the plate heat exchanger primary side 21 and the outlet of the first condenser 6. A ninth valve 19 is installed on the pipe connecting the inlet of cooling tower 20 and the outlet of the plate heat exchanger primary side 21. A sixth valve 16 is installed on the pipe connecting the inlet of cooling tower 20 and the outlet of the first condenser 6. The inlet of the ninth valve 19 is then connected to the outlet of the second condenser 8. A fourth valve 14 is installed on the upper part of the system. The inlet of the fourth valve 14 is connected to the outlet of the sixth valve 16. The outlet of the fourth valve 14 is connected to the outlet of the cooling pump 9. A first valve 11 and a high-temperature pump 10 are installed on the pipe connecting the outlet of the fourth valve 14 and the outlet of the cooling pump 9. The outlet of the first valve 11 is connected to the inlet of the first condenser 6. The inlet of the plate heat exchanger primary side 21 is connected to the inlet of the sixth valve 16. A seventh valve 17 is installed on the pipe connecting the inlet of the plate heat exchanger primary side 21 and the inlet of the sixth valve 16. A third valve 13 is installed on the pipe connecting the outlet of the first valve 11 and the inlet of the first condenser 6.

[0051] A first temperature sensor 23 is installed at the inlet of the newly installed centrifuge 1, a second temperature sensor 24 is installed at the inlet of the running centrifuge 2, and a third temperature sensor 25 is installed on the pipeline connecting the inlet of the ninth valve 19 and the outlet of the fourth valve 14.

[0052] An automatic control system can collect and monitor on-site operating data to achieve automatic operation;

[0053] The automatic controller includes a computer terminal and a process station;

[0054] The process station adopts a modular approach for data acquisition and monitoring of monitoring points, which include various pumps, valves, and temperature sensors.

[0055] The data from the monitoring points includes: the operating data of each pump, the temperature data of each temperature sensor, and the opening data of each valve; the operating data includes the pump motor frequency, operating status, current, and voltage.

[0056] 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 point on site, thereby realizing automated operation.

[0057] For temperature acquisition, a temperature monitoring module is added to the configuration control hardware tree of the process station. The slot address is set, the channel parameters are configured, the signal type is set to RTD, the temperature sensor is set to PT100, and the range is set to 0℃~100℃. The corresponding channel acquires the PT100 resistance value, automatically performs linearization processing and converts it into a temperature value (℃). The temperature value (℃) is transmitted to the database of the computer terminal through the optical fiber and the process station, and displayed on the monitoring interface of the computer terminal.

[0058] For valve status acquisition, an electric valve control module is added to the configuration hardware tree of the process station, the slot address is set, the channel parameters are configured, and a 4-20mA analog signal is input as the electric valve drive signal. 4mA corresponds to 0% opening, which means the valve is fully closed, and 20mA corresponds to 100%, which means the valve is fully open. The valve status is transmitted to the database of the computer terminal through optical fiber and the process station, and is displayed on the monitoring interface of the computer terminal and used for valve opening and closing control.

[0059] For pump motor data acquisition, the pump motor is equipped with a frequency converter. The frequency converter monitors the current output frequency in real time and feeds it back to the process station through the communication interface. After receiving the signal, the process station stores the value in its internal memory and transmits the real-time frequency value to the database of the computer terminal through the fiber optic network for storage and dynamic display on the monitoring interface of the computer terminal.

[0060] For pump flow data acquisition, according to the similarity law, flow rate is directly proportional to speed. The motor speed is equal to the power supply frequency multiplied by 60 and then divided by the number of magnetic pole pairs. The number of magnetic pole pairs of the motor is usually 2. The motor speed is controlled by detecting and adjusting the motor frequency. The pump flow rate is calculated from the speed. The flow signal is transmitted to the computer terminal database through the frequency converter and optical fiber and displayed on the computer terminal monitoring interface.

[0061] 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 point to make the collected value infinitely close to the set value; the collected data is uploaded to the computer terminal in real time.

[0062] The process station also receives advanced control commands from the computer terminal to control each monitoring point.

[0063] The computer terminal is used to receive real-time data transmitted from the process station, issue control commands to the process station through the established control program, and also to display real-time data, valve control, frequency converter control, and temperature control.

[0064] The computer terminal includes a display module and an advanced control module;

[0065] The display module is used to display the collected data and control scheme of each monitoring point.

[0066] The advanced control module is used to determine the drying and operation stages of the centrifuge, issue adjustment commands and schemes to the process station, and automatically adjust the operating data of each pump and the opening degree of each valve.

[0067] An embodiment of the present invention discloses a method for drying a newly assembled centrifuge, comprising the following steps:

[0068] The refrigeration unit connected to the first evaporator 5 is set to operate in heating mode, and the refrigeration unit connected to the second evaporator 7 is set to operate in cooling mode. The cooling water produced by the first evaporator 5 and the second evaporator 7 is used to cool the centrifuge 2. The heat generated by the second condenser 8 is discharged into the atmosphere through the cooling tower 20. The heat generated by the first condenser 6 is used to dry the newly installed centrifuge 1 through the primary side 21 and the secondary side 22 of the plate heat exchanger.

[0069] Specifically, the outlet water temperature of the first condenser 6 is set to the drying requirement temperature, and the outlet water temperature of the second evaporator 7 is set to the cooling requirement temperature. The eighth valve 18 and the fifth valve 15 are closed, the chilled water pump 4 is running, and the cooling water passes through the first evaporator 5 and the second evaporator 7 to cool the centrifuge 2. The first valve 11, the fourth valve 14, the sixth valve 16, and the ninth valve 19 are closed, the second valve 12 is opened, the cooling pump 9 is running, and the second condenser 8 dissipates heat through the cooling tower 20. The third valve 13 and the seventh valve 17 are opened, the high-temperature pump 10 is running, and the high-temperature hot water produced by the first condenser 6 is sent to the primary side 21 of the plate heat exchanger through the high-temperature pump 10. The hot water pump 3 is running, and the secondary side 22 of the plate heat exchanger dries the newly installed centrifuge 1 by exchanging heat with the primary side 21 of the plate heat exchanger.

[0070] During the drying process, the water supply temperature of the centrifuge 2 is controlled within the range of 11℃ to 15℃, the water supply temperature of the newly installed centrifuge 1 is controlled within the range of 60℃ to 63℃, and the inlet water temperature of the first condenser 6 is controlled within the range of 50℃ to 55℃. When controlling the inlet water temperature of the first condenser 6, the hot water circulation volume is kept constant.

[0071] The method for controlling the water supply temperature of centrifuge 2 within the range of 11℃ to 15℃ is as follows: the second evaporator 7 automatically tracks the temperature change of the second temperature sensor 24 and automatically adjusts its own temperature to keep the water supply temperature of centrifuge 2 within the range of 11℃ to 15℃; specifically, a communication protocol is set between the second temperature sensor 24 and the outlet water temperature sensor of the second evaporator 7. The control logic relationship between the temperature of the second temperature sensor 24 and the outlet water temperature of the second evaporator 7 is a reverse one-to-one correspondence. For example, if the temperature of the second temperature sensor 24 is 1℃ higher than the upper limit, the outlet water temperature of the second evaporator 7 will automatically decrease by 1℃; if the temperature of the second temperature sensor 24 is 1℃ lower than the lower limit, the outlet water temperature of the second evaporator 7 will automatically increase by 1℃. The monitoring and control of the outlet water temperature of the second evaporator 7 is determined by the communication protocol of the refrigeration unit itself.

[0072] The method for controlling the water supply temperature of the newly installed centrifuge 1 within the range of 60℃ to 63℃ is as follows: the first condenser 6 automatically tracks the temperature change of the first temperature sensor 23 and automatically adjusts its own temperature to keep the water supply temperature of the newly installed centrifuge 1 within the range of 60℃ to 63℃; specifically, a communication protocol is set between the first temperature sensor 23 and the outlet water temperature sensor of the first condenser 6. The control logic relationship between the temperature of the first temperature sensor 23 and the outlet water temperature sensor of the first condenser 6 is a reverse one-to-one correspondence. For example, if the temperature of the first temperature sensor 23 is 1℃ higher than the upper limit, the outlet water temperature of the first condenser 6 will automatically decrease by 1℃; if the temperature of the first temperature sensor 23 is 1℃ lower than the lower limit, the outlet water temperature of the first condenser 6 will automatically increase by 1℃. The monitoring and control of the outlet water temperature of the first condenser 6 is determined by the communication protocol of the refrigeration unit itself.

[0073] The inlet water temperature of the first condenser 6 is controlled within the range of 50℃ to 55℃;

[0074] If the inlet water temperature of the first condenser 6 exceeds 55°C, then open the fourth valve 14 and the ninth valve 19.

[0075] The hot water circulation system refers to the hot water circulation that operates in the loop formed by the first condenser 6, the seventh valve 17, the primary side of the plate heat exchanger 21, the high-temperature pump 10, and the third valve 13. After the fourth valve 14 and the ninth valve 19 are opened, under the action of the high-temperature pump 10, part of the water from the outlet of the second condenser 8 enters the hot water circulation system through the fourth valve 14 and is discharged into the cooling tower 20 at the outlet of the primary side of the plate heat exchanger 21. Since water enters the hot water circulation system, it is discharged through the ninth valve 19 in order to maintain the hydraulic balance of the hot water circulation system.

[0076] Specifically, the inlet water temperature of the first condenser 6 is determined according to the formula... Adjustments are made. Here, t represents the inlet water temperature of the first condenser 6, and m1 represents the flow rate at the corresponding opening degree of the fourth valve 14. Setting the opening degree of the fourth valve 14 to 10% corresponds to 5% of the flow rate at the operating frequency of the cooling pump 9. For example, the flow rate of the cooling pump 9 at 50Hz is 1800 m³ / s. 3 / h, the flow rate when the fourth valve 14 is opened 10% is 90 m³ / h. 3 / h, t1 represents the outlet water temperature of the second condenser 8, m2 represents the flow rate of the high-temperature pump 10 at its operating frequency, and t2 represents the temperature of the third temperature sensor 25; for example, if the opening degree of the fourth valve 14 is set to 20%, then m1 equals 180 m 3 / h, the outlet water temperature t1 of the second condenser 8 is generally 35℃, the temperature detected by the third temperature sensor 25 is 63℃, and the flow rate of the high-temperature pump 10 is adjusted to 300 m³ / h. 3 If the water temperature at the inlet of the first condenser 6 is controlled at 52.5℃, the refrigeration unit connected to the first condenser 6 will operate stably under heating conditions within the required range of 50℃~55℃.

[0077] The specific operation to ensure a constant hot water circulation volume is as follows: a communication protocol is set between the fourth valve 14 and the ninth valve 19. When the fourth valve 14 is open, the ninth valve 19 opens synchronously; when the fourth valve 14 is closed, the ninth valve 19 closes synchronously. The opening degree of the fourth valve 14 and the ninth valve 19 are kept consistent. For example, if the fourth valve 14 is opened by 10%, the ninth valve 19 is opened by 10% synchronously to ensure that the hot water circulation volume of the closed hot water circulation system remains constant.

[0078] Set the automatic / manual switching button on the computer monitoring interface, click the automatic drying operation control program, and the system will automatically dry the newly installed centrifuge 1.

[0079] The system for drying newly installed centrifuges, as described in the above technical solution, allows for the simultaneous heating of more than 6-8 sections of centrifuge units. Since this system primarily utilizes the heat generated by the operating centrifuge 2 itself to dry the newly installed centrifuge 1, and the installation, drying, and commissioning of centrifuges during uranium enrichment project construction are carried out in stages and batches, the number of operating centrifuges 2 is always greater than the number of newly installed centrifuges 1 requiring drying. Furthermore, according to thermodynamic principles, when the refrigeration unit cools the operating centrifuge 2, the heat released by the condenser equals the heat generated by the operating centrifuge 2 during operation plus the power consumption of the compressor. Therefore, the heat generated by the operating centrifuge 2 is far greater than the heat required to dry the newly installed centrifuges 1, making the number of newly installed centrifuges 1 that can be dried at one time unlimited and significantly shortening the uranium enrichment project construction cycle.

[0080] 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.

[0081] 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. A system for drying a newly assembled centrifuge, characterized in that, include: The newly installed centrifuge, hot water pump, and plate heat exchanger secondary side form a circulation loop; The outlet of the first evaporator is connected to the inlet of the operating centrifuge and the outlet of the second evaporator. A chilled pump is installed at the inlet of the first evaporator. The inlet of the chilled pump is then connected to the outlet of the operating centrifuge, and the outlet of the chilled pump is then connected to the inlet of the second evaporator. The outlet of the first evaporator is connected to the inlet of the newly installed centrifuge and the secondary outlet of the plate heat exchanger via a main pipeline. An eighth valve is installed on the main pipeline, and the inlet of the eighth valve is then connected to the inlet of the operating centrifuge. The outlet of the second evaporator is connected to the main pipeline; The inlet of the first evaporator is connected to the outlet of the newly installed centrifuge. A fifth valve and a chilled pump are sequentially installed on the pipe connecting the inlet of the first evaporator and the outlet of the newly installed centrifuge. The inlet of the fifth valve is then connected to the inlet of the hot water pump. The outlet of the plate heat exchanger secondary side is connected to the inlet of the newly installed centrifuge. The inlet of the plate heat exchanger secondary side is connected to the outlet of the newly installed centrifuge. A hot water pump is installed on the pipe connecting the inlet of the plate heat exchanger secondary side and the outlet of the newly installed centrifuge. The cooling tower outlet is connected to the second condenser inlet, and a cooling pump is installed on the pipe connecting the cooling tower outlet and the second condenser inlet; The cooling tower inlet is connected to the plate heat exchanger primary side outlet and the first condenser outlet, respectively. The first condenser, the primary side of the plate heat exchanger, and the high-temperature pump constitute a circulation loop; A first temperature sensor is installed at the inlet of the newly installed centrifuge, and a second temperature sensor is installed at the inlet of the running centrifuge. A ninth valve is installed on the pipe connecting the cooling tower inlet and the primary side outlet of the plate heat exchanger. The inlet of the ninth valve is then connected to the outlet of the second condenser. A fourth valve is installed on the pipe connecting the outlet of the second condenser. The inlet of the fourth valve is then connected to the outlet of the sixth valve. The outlet of the fourth valve is then connected to the outlet of the cooling pump. A first valve and a high-temperature pump are installed on the pipe connecting the outlet of the fourth valve and the outlet of the cooling pump. The outlet of the first valve is then connected to the inlet of the first condenser. The primary side inlet of the plate heat exchanger is connected to the inlet of the sixth valve. A seventh valve is installed on the pipe connecting the primary side inlet of the plate heat exchanger and the inlet of the sixth valve. A third valve is installed on the pipe connecting the outlet of the first valve and the inlet of the first condenser. The automatic control system collects data from each pump, temperature sensor, and valve in real time, and automatically adjusts the operating data of each pump and the opening degree of each valve.

2. The system for drying a newly assembled centrifuge according to claim 1, characterized in that, A third temperature sensor is installed on the pipe connecting the inlet of the ninth valve and the outlet of the fourth valve.

3. The system for drying a newly assembled centrifuge according to claim 2, characterized in that, The automatic control system includes a process station and a computer terminal: 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; the monitoring points include various pumps, valves, cooling towers and temperature sensors. The computer terminal is used to receive data collected by the process station and to issue adjustment commands to the process station based on the collected temperature data.

4. A method for drying a newly assembled centrifuge based on the system described in claim 3, characterized in that, Includes the following steps: The refrigeration unit connected to the first evaporator is set to operate in heating mode, and the refrigeration unit connected to the second evaporator is set to operate in cooling mode. The cooling water produced by the first and second evaporators is used to cool the operating centrifuge. The heat generated by the second condenser is discharged into the atmosphere through the cooling tower. The heat generated by the first condenser is used to dry the newly installed centrifuge through the primary and secondary sides of the plate heat exchanger.

5. The method for drying a newly assembled centrifuge according to claim 4, characterized in that, The outlet water temperature of the first condenser is set to the drying requirement temperature, and the outlet water temperature of the second evaporator is set to the cooling requirement temperature. The eighth and fifth valves are closed, the chilled water pump runs, and the cooling water passes through the first and second evaporators to cool the operating centrifuge. The first, fourth, sixth, and ninth valves are closed, the second valve is opened, the cooling pump runs, and the second condenser dissipates heat through the cooling tower. The third and seventh valves are opened, the high-temperature pump runs, and the high-temperature hot water produced by the first condenser is sent to the primary side of the plate heat exchanger via the high-temperature pump. When the hot water pump is running, the secondary side of the plate heat exchanger dries the newly installed centrifuge by exchanging heat with the primary side of the plate heat exchanger.

6. The method for drying a newly assembled centrifuge according to claim 5, characterized in that, During the drying process of the newly installed centrifuge, the water supply temperature of the centrifuge is controlled within the range of 11℃ to 15℃, the water supply temperature of the newly installed centrifuge is controlled within the range of 60℃ to 63℃, and the inlet water temperature of the first condenser is controlled within the range of 50℃ to 55℃. When controlling the inlet water temperature of the first condenser, the hot water circulation volume is kept constant. The hot water circulation refers to the hot water circulation that runs in the loop formed by the first condenser, the seventh valve, the primary side of the plate heat exchanger, the high-temperature pump, and the third valve.

7. The method for drying a newly assembled centrifuge according to claim 6, characterized in that, The second evaporator automatically tracks the temperature changes of the second temperature sensor and automatically adjusts its own temperature to keep the water supply temperature of the centrifuge within the range of 11℃ to 15℃.

8. The method for drying a newly assembled centrifuge according to claim 6, characterized in that, The first condenser automatically tracks the temperature change of the first temperature sensor and automatically adjusts its own temperature to keep the water supply temperature of the newly installed centrifuge within the range of 60℃ to 63℃.

9. The method for drying a newly assembled centrifuge according to claim 6, characterized in that, If the inlet water temperature of the first condenser exceeds 55°C, then open the fourth and ninth valves.

10. The method for drying a newly assembled centrifuge according to claim 9, characterized in that, A communication protocol is set between the fourth and ninth valves, which open or close synchronously and keep their opening degrees consistent to ensure that the hot water circulation volume remains constant.

Images