A large temperature difference chilled water production system

Abstract

The present invention relates to the technical field of chilled water preparation, and in particular to a large temperature difference chilled water preparation system, comprising a closed cooling tower provided with a coil and a primary water-cooled chiller, a spray mechanism being arranged in the closed cooling tower, the spray mechanism being connected to the primary water-cooled chiller, a water accumulation pan being arranged at the bottom end of the closed cooling tower, the water accumulation pan being connected to the primary water-cooled chiller, and further comprising a plate heat exchanger and a secondary air-cooled chiller; a spray pump being arranged on a second water outlet pipe; the plate heat exchanger comprising a first fluid channel and a second fluid channel, the first fluid channel and the primary water-cooled chiller forming a water circulation; a water inlet of the second fluid channel being connected to a water outlet of the coil, the water outlet of the second fluid channel being connected to the secondary air-cooled chiller, the secondary air-cooled chiller being used to be connected to a water inlet of an external device, and through the above technical scheme, the present invention has the advantage of reducing the energy consumption of a cooling system.

Description

Technical Field

[0001] The invention relates to a chilled water production system, in particular to a large temperature difference chilled water production system. Background Art

[0002] In many industrial production situations, chilled water is required for temperature control. Chilled water refers to low-temperature water with a temperature below 10°C.

[0003] Although the normal industrial water temperature difference is between 5-10℃, large temperature differences can occur in specific industrial cycles, and the maximum temperature difference in such cycles can reach 40-50℃.

[0004] Due to the process limitations of the chiller, the water temperature entering the evaporator of the chiller cannot be too high, resulting in the system being unable to prepare the required chilled water through a single chiller cooling. Therefore, multi-stage refrigeration is required to prepare the required chilled water, and the smaller temperature difference system is more complicated. Summary of the Invention

[0005] In order to solve the problems in the related art, the present application provides a large temperature difference chilled water production system, which solves the problem of high energy consumption of existing cooling systems.

[0006] The technical solution is as follows:

[0007] A large temperature difference chilled water production system includes a closed cooling tower and a primary water-cooled chiller. A coil is provided in the closed cooling tower. The water inlet of the coil is used to communicate with the water outlet of an external device. The water outlet of the coil is connected to a first water outlet pipe. A spray mechanism is provided in the closed cooling tower above the coil. The spray mechanism is connected to the water outlet of the condenser in the primary water-cooled chiller through the first water inlet pipe. A water accumulation pan is provided at the bottom end of the closed cooling tower. The water accumulation pan is connected to the water inlet of the condenser in the primary water-cooled chiller through a second water outlet pipe. The system is characterized in that it further includes a plate heat exchanger and a secondary air-cooled chiller; the second water outlet pipe is provided with a spray pump;

[0008] The plate heat exchanger includes a first fluid channel and a second fluid channel, the water inlet of the first fluid channel is connected to the water outlet of the evaporator in the first-stage water-cooled chiller through a third water outlet pipe, and the water outlet of the first fluid channel is connected to the water inlet of the evaporator in the first-stage water-cooled chiller through a second water inlet pipe;

[0009] The water inlet of the second fluid channel is connected to the first water outlet pipe, the water outlet of the second fluid channel is connected to a fourth water outlet pipe, the other end of the fourth water outlet pipe is connected to the water inlet of the evaporator in the two-stage air-cooled chiller, the water outlet of the evaporator in the two-stage air-cooled chiller is connected to a fifth water outlet pipe, and the fifth water outlet pipe is used to communicate with the water inlet of an external device;

[0010] The high-temperature water output by the external equipment is cooled by the coil and then flows to the first fluid channel in the plate heat exchanger. During the process of the water flowing in the first fluid channel, the evaporator in the first-stage water-cooled chiller transports chilled water to the second fluid channel in the plate heat exchanger. During the process of the chilled water flowing along the second fluid channel, it will cool the water flowing in the first fluid channel. After the cooling is completed, the water in the second fluid channel flows back to the evaporator in the first-stage water-cooled chiller, and the water in the first fluid channel flows to the second-stage air-cooled chiller, and is transported to the external equipment after being cooled by the second-stage air-cooled chiller.

[0011] The water in the evaporator of the first-stage water-cooled chiller is cooled by the condenser in the first-stage water-cooled chiller. The condenser in the first-stage water-cooled chiller transports the higher temperature water to the spray mechanism, and then transports it to the condenser in the first-stage water-cooled chiller after cooling in the closed cooling tower.

[0012] Through the above technical solution, by setting up a closed cooling tower, the coil in the closed cooling tower can cool the circulating water in the system. Through the setting of the spray mechanism in the closed cooling tower, the water flowing out of the water accumulation tray can also cool the condenser in the first-stage water-cooled chiller, thereby making the closed cooling tower realize multiple uses, thereby reducing equipment investment and lowering energy consumption;

[0013] Because the spray mechanism is directly connected to the condenser in the first-stage water-cooled chiller, the end of the spray mechanism can spray by the residual pressure of the condenser. The spray water evaporates and cools the tube bundle. After the temperature drops, it falls into the water accumulation pan and enters the condenser for use, thereby greatly improving the working efficiency of the condenser cooling pump. In addition, through residual pressure spraying, the cooling tower spray pump required for the spray mechanism in the closed cooling tower can be omitted, thereby reducing the power consumption of this system.

[0014] By setting up a plate heat exchanger with a first fluid channel and a second fluid channel, external equipment delivers water above 45°C to the closed cooling tower. After cooling in the closed cooling tower, the water temperature is generally below 35°C. In addition, the closed cooling tower at the front end of the cooling system performs a temperature reduction on the water body, which can make the high-temperature water body approach the wet-bulb temperature of the environment, thereby reducing the heat load of the rear-end primary water-cooled chiller and the secondary air-cooled chiller. The maximum use of natural cooling source can effectively reduce the power consumption of the compressor, thereby improving the energy saving effect of the system.

[0015] Because the water cooled by the closed cooling tower cannot directly enter the water-cooled chiller for cooling, the water below 35°C is transported to the first fluid channel in the plate heat exchanger. At this time, a water circulation is formed through the water-cooled chiller and the second fluid channel in the plate heat exchanger, which realizes the cooling of the water in the first fluid channel, thereby solving the problem of requiring multi-stage refrigeration before it can be input into the water-cooled chiller for cooling, so that the water temperature output from the first fluid channel is below 15°C. At this time, the water body enters the air-cooled chiller for cooling. The cooled water temperature is below 5°C and can be used by external equipment. The energy consumption of the fan-type chiller is lower than that of the water-cooled chiller. Therefore, only one water-cooled chiller and one water-cooled chiller are used in this system to complete the large temperature difference cooling, thereby reducing the energy consumption of this system and achieving energy saving effect.

[0016] Preferably, the water inlet and the water outlet of the first fluid channel are connected via a connecting pipe, and a first flow regulating valve is provided on the connecting pipe;

[0017] When the closed cooling tower is in a relatively cold environment, the outlet temperature of the first water outlet pipe is relatively low, and the flow rate entering the first fluid channel is reduced by adjusting the first flow regulating valve;

[0018] When the closed cooling tower is in a warm or relatively hot environment, the outlet liquid temperature of the first outlet pipe is relatively high. By adjusting or closing the first flow regulating valve, the flow entering the first fluid channel is increased or all the fluid enters the first fluid channel.

[0019] Through the above technical solution, through the setting of the first flow regulating valve, the temperature of the water after cooling by the coil in the closed cooling tower will change with the change of the ambient temperature around the closed cooling tower. When the outlet water temperature of the first outlet pipe decreases, the first flow regulating valve is adjusted to reduce the amount of water entering the first fluid channel, which will reduce the cooling workload of the second fluid channel, and then reduce the load of the first-stage water-cooled chiller, thereby achieving energy-saving effects.

[0020] Preferably, the water inlet and outlet ends of the coil both extend out of the closed cooling tower; the first water outlet pipe includes a first water outlet section pipe and a second water outlet section pipe, one end of the first water outlet section pipe is flange-connected to the water outlet of the coil, the other end of the first water outlet section pipe is connected to a first buffer water tank, the water outlet of the first buffer water tank is connected to the sixth water outlet pipe, and the other end of the sixth water outlet pipe is connected to the water inlet of the first fluid channel.

[0021] Preferably, a first water pump is provided at one end of the second water outlet section pipe close to the first buffer water tank, a second flow regulating valve is provided at one end of the second water outlet section pipe close to the plate heat exchanger, and a third flow regulating valve is provided at one end of the fourth water outlet pipe close to the plate heat exchanger; both ends of the connecting pipe are respectively connected to the second water outlet section pipe and the fourth water outlet pipe.

[0022] An air inlet is provided in the closed cooling tower above the water accumulation tray, an air inlet grille is provided on the closed cooling tower corresponding to the air inlet, a packing layer is provided in the closed cooling tower above the air inlet grille, and a cooling fan is provided at the top of the closed cooling tower.

[0023] Preferably, the third water outlet pipe includes a third water outlet section pipe and a fourth water outlet section pipe, one end of the third water outlet section pipe is connected to the water outlet of the evaporator in the first-stage water-cooled chiller, the other end of the third water outlet section pipe is connected to the second buffer water tank, the water outlet of the second buffer water tank is connected to one end of the fourth water outlet section pipe, and the other end of the fourth water outlet section pipe is connected to the water inlet of the second fluid channel.

[0024] Preferably, a freezing pump is provided on the fourth water outlet pipe.

[0025] In summary, the beneficial effects of a large temperature difference chilled water production system are:

[0026] 1. Through the setting of closed cooling tower, the coil inside the closed cooling tower can cool the circulating water in the system. Through the setting of the spray mechanism in the closed cooling tower, the water flowing out from the water accumulation tray can also cool the condenser in the first-stage water-cooled chiller, thereby making the closed cooling tower realize multiple uses, thereby reducing equipment investment and energy consumption;

[0027] Because the spray mechanism is directly connected to the condenser in the first-stage water-cooled chiller, the end of the spray mechanism can spray by the residual pressure of the condenser. The spray water evaporates and cools the tube bundle. After the temperature drops, it falls into the water accumulation pan and enters the condenser for use, thereby greatly improving the working efficiency of the condenser cooling pump. In addition, through residual pressure spraying, the cooling tower spray pump required for the spray mechanism in the closed cooling tower can be omitted, thereby reducing the power consumption of this system.

[0028] By setting up a plate heat exchanger with a first fluid channel and a second fluid channel, external equipment delivers water above 45°C to the closed cooling tower. After cooling in the closed cooling tower, the water temperature is generally below 35°C. In addition, the closed cooling tower at the front end of the cooling system performs a temperature reduction on the water body, which can make the high-temperature water body approach the wet-bulb temperature of the environment, thereby reducing the heat load of the rear-end primary water-cooled chiller and the secondary air-cooled chiller. The maximum use of natural cooling source can effectively reduce the power consumption of the compressor, thereby improving the energy saving effect of the system.

[0029] Because the water cooled by the closed cooling tower cannot directly enter the water-cooled chiller for cooling, the water below 35°C is transported to the first fluid channel in the plate heat exchanger. At this time, a water circulation is formed through the water-cooled chiller and the second fluid channel in the plate heat exchanger, which realizes the cooling of the water in the first fluid channel, thereby solving the problem of needing multi-stage refrigeration before being input into the water-cooled chiller for cooling, so that the water temperature output from the first fluid channel is below 15°C. At this time, the water body enters the air-cooled chiller for cooling. The cooled water temperature is below 5°C and can be used by external equipment. In addition, the energy consumption of the fan-type chiller is lower than that of the water-cooled chiller. Therefore, only one water-cooled chiller and one water-cooled chiller are used in this system to complete the large temperature difference cooling, thereby reducing the energy consumption of this system, thereby achieving energy saving effect.

[0030] 2. Through the setting of the first flow regulating valve, the temperature of the water after cooling by the coil in the closed cooling tower will change with the change of the ambient temperature around the closed cooling tower. When the outlet water temperature of the first outlet pipe decreases, the first flow regulating valve is adjusted to reduce the amount of water entering the first fluid channel, which will reduce the cooling workload of the second fluid channel, and then reduce the load of the first-stage water-cooled chiller, thereby achieving energy saving effect.

[0031] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0033] Figure 1 This is a connection diagram of a large temperature difference chilled water production system;

[0034] Figure 2 This is a schematic diagram of the connection between a plate heat exchanger and a primary water-cooled chiller in a large temperature difference chilled water production system;

[0035] Figure 3This is a schematic diagram of the connection between a plate heat exchanger and a closed cooling tower in a large temperature difference chilled water production system;

[0036] Figure 4 This is a schematic diagram of water flow direction when the first flow regulating valve in a large temperature difference chilled water production system is in a closed state;

[0037] In the figure, 1, closed cooling tower; 2, first-stage water-cooled chiller; 3, coil; 4, first outlet pipe; 401, first outlet pipe; 402, second outlet pipe; 5, spray mechanism; 6, first water inlet pipe; 7, water accumulation tray; 8, second outlet pipe; 9, plate heat exchanger; 10, second-stage air-cooled chiller; 11, first fluid channel; 12, second fluid channel; 13, third outlet pipe; 1301, third outlet pipe Section pipe; 1302, fourth water outlet section pipe; 14, second water inlet pipe; 15, fourth water outlet pipe; 16, fifth water outlet pipe; 17, connecting pipe; 18, first flow regulating valve; 19, first buffer water tank; 20, first water pump; 21, second flow regulating valve; 22, third flow regulating valve; 23, air inlet grille; 24, packing layer; 25, cooling fan; 26, second buffer water tank; 27, refrigeration pump; 28, spray pump. DETAILED DESCRIPTION

[0038] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0039] In one possible embodiment, as shown in the attached Figure 1-4 As shown, a large temperature difference chilled water production system includes a closed cooling tower 1 and a primary water-cooled chiller 2. A coil 3 is provided in the closed cooling tower 1. The water inlet of the coil 3 is used to communicate with the water outlet of an external device. The water outlet of the coil 3 is connected to a first water outlet pipe 4. A spray mechanism 5 is provided in the closed cooling tower 1 above the coil 3. The spray mechanism 5 is connected to the water outlet of the condenser in the primary water-cooled chiller 2 through a first water inlet pipe 6. A water collection pan 7 is provided at the bottom end of the closed cooling tower 1. The water collection pan 7 is connected to the water inlet of the condenser in the primary water-cooled chiller 2 through a second water outlet pipe 8. A spray pump 28 is provided on the second water outlet pipe 8.

[0040] It also includes a plate heat exchanger 9 and a two-stage air-cooled chiller 10; the plate heat exchanger 9 includes a first fluid channel 11 and a second fluid channel 12, the water inlet of the first fluid channel 11 is connected to the water outlet of the evaporator in the first-stage water-cooled chiller 2 through a third water outlet pipe 13, and the water outlet of the first fluid channel 11 is connected to the water inlet of the evaporator in the first-stage water-cooled chiller 2 through a second water inlet pipe 14;

[0041] The water inlet of the second fluid channel 12 is connected to the first water outlet pipe 4, and the water outlet of the second fluid channel 12 is connected to the fourth water outlet pipe 15. The other end of the fourth water outlet pipe 15 is connected to the water inlet of the evaporator in the two-stage air-cooled chiller 10. The water outlet of the evaporator in the two-stage air-cooled chiller 10 is connected to the fifth water outlet pipe 16. The fifth water outlet pipe 16 is used to communicate with the water inlet of an external device;

[0042] The high-temperature water output by the external device is cooled by the coil 3 and then flows to the first fluid channel 11 in the plate heat exchanger 9. During the process of the water flowing in the first fluid channel 11, the evaporator in the primary water-cooled chiller 2 transports chilled water to the second fluid channel 12 in the plate heat exchanger 9. During the process of the chilled water flowing along the second fluid channel 12, the water flowing in the first fluid channel 11 is cooled. After the cooling is completed, the water in the second fluid channel 12 flows back to the evaporator in the primary water-cooled chiller 2, and the water in the first fluid channel 11 flows to the secondary air-cooled chiller 10. After being cooled by the secondary air-cooled chiller 10, it is transported to the external device.

[0043] The water in the evaporator of the first-stage water-cooled chiller 2 is cooled by the condenser of the first-stage water-cooled chiller 2. The condenser of the first-stage water-cooled chiller 2 transports the water with a higher temperature to the spray mechanism 5, and after being cooled by the closed cooling tower 1, it is transported to the condenser of the first-stage water-cooled chiller 2.

[0044] The coil 3 of the closed cooling tower 1 can cool the circulating water in the system. Through the setting of the spray mechanism 5 in the closed cooling tower 1, the water flowing out from the water accumulation tray 7 can also cool the condenser in the primary water-cooled chiller 2, thereby making the closed cooling tower 1 realize multiple uses, thereby reducing equipment investment and energy consumption;

[0045] Because the spray mechanism 5 is directly connected to the condenser of the first-stage water-cooled chiller 2, the end of the spray mechanism 5 can spray by the residual pressure of the condenser of the first-stage water-cooled chiller 2. The spray water evaporates and cools the tube bundle. At the same time, after the temperature drops, it falls into the water accumulation tray 7 and enters the condenser of the first-stage water-cooled chiller 2 for use, thereby greatly improving the working efficiency of the cooling pump of the condenser of the first-stage water-cooled chiller 2. In addition, through the residual pressure spraying, the cooling tower spray pump required for the spray mechanism in the closed cooling tower 1 can be omitted, thereby reducing the power consumption of the system.

[0046] External equipment delivers water above 45°C to the closed cooling tower 1. After cooling by the closed cooling tower 1, the water temperature is generally below 35°C. The closed cooling tower 1 at the front end of the cooling system lowers the water temperature once, which can make the high-temperature water close to the wet-bulb temperature of the environment, thereby reducing the heat load of the rear-end primary water-cooled chiller 2 and the secondary air-cooled chiller 10. The maximum use of natural cooling sources can effectively reduce the power consumption of the compressor, thereby improving the energy-saving effect of the system.

[0047] Because the water cooled by the closed cooling tower 1 cannot directly enter the water-cooled chiller for cooling, the water below 35°C is transported to the first fluid channel 11 in the plate heat exchanger 9. At this time, a water circulation is formed through the water-cooled chiller and the second fluid channel 12 in the plate heat exchanger 9, which realizes the cooling of the water in the first fluid channel 11, thereby solving the problem of requiring multi-stage refrigeration before being input into the water-cooled chiller for cooling, so that the water temperature output from the first fluid channel 11 is below 15°C. At this time, the water body can enter the air-cooled chiller for cooling. The cooled water temperature is below 5°C and can be used by external equipment, and the energy consumption of the fan-type chiller is lower than that of the water-cooled chiller. Therefore, only one water-cooled chiller and one water-cooled chiller are used in this system to complete large temperature difference cooling, thereby reducing the energy consumption of this system and achieving energy-saving effects.

[0048] The water inlet and outlet of the first fluid channel 11 are connected by a connecting pipe 17, and a first flow regulating valve 18 is provided on the connecting pipe. When the closed cooling tower 1 is in a relatively cold environment, the outlet temperature of the first water outlet pipe 4 is low, and the first flow regulating valve 18 is adjusted to reduce the flow rate entering the first fluid channel 11. When the closed cooling tower 1 is in a warm or relatively hot environment, the outlet temperature of the first water outlet pipe 4 is high, and the first flow regulating valve 18 is adjusted or closed to increase the flow rate entering the first fluid channel 11 or to allow the entire flow rate to enter the first fluid channel 11. The temperature of the water cooled by the coil 3 in the closed cooling tower 1 will change with the change of the ambient temperature of the closed cooling tower 1. When the outlet temperature of the water from the first water outlet pipe 4 decreases, the first flow regulating valve 18 is adjusted to reduce the amount of water entering the first fluid channel 11. This will reduce the cooling workload of the second fluid channel 12, thereby reducing the load of the primary water-cooled chiller 2, thereby achieving energy saving.

[0049] The water inlet and outlet ends of the coil 3 both extend outside the closed cooling tower 1; the first water outlet pipe 4 includes a first water outlet section pipe 401 and a second water outlet section pipe 402, one end of the first water outlet section pipe 401 is flange-connected to the water outlet of the coil 3, the other end of the first water outlet section pipe 401 is connected to the first buffer water tank 19, the water outlet of the first buffer water tank 19 is connected to the sixth water outlet pipe, and the other end of the sixth water outlet pipe is connected to the water inlet of the first fluid channel 11.

[0050] A first water pump 20 is provided at the end of the second water outlet section pipe 402 close to the first buffer water tank 19, a second flow regulating valve 21 is provided at the end of the second water outlet section pipe 402 close to the plate heat exchanger 9, and a third flow regulating valve 22 is provided at the end of the fourth water outlet pipe 15 close to the plate heat exchanger 9; the two ends of the connecting pipe are respectively connected to the second water outlet section pipe 402 and the fourth water outlet pipe 15.

[0051] An air inlet is provided in the closed cooling tower 1 above the water accumulation tray 7, an air inlet grille 23 is provided on the closed cooling tower 1 corresponding to the air inlet, a packing layer 24 is provided in the closed cooling tower 1 above the air inlet grille 23, and a cooling fan 25 is provided at the top of the closed cooling tower 1.

[0052] The third water outlet pipe 13 includes a third water outlet section pipe 1301 and a fourth water outlet section pipe 1302. One end of the third water outlet section pipe 1301 is connected to the water outlet of the evaporator in the first-stage water-cooled chiller 2, and the other end of the third water outlet section pipe 1301 is connected to the second buffer water tank 26. The water outlet of the second buffer water tank 26 is connected to one end of the fourth water outlet section pipe 1302, and the other end of the fourth water outlet section pipe 1302 is connected to the water inlet of the second fluid channel 12; a freezing pump 27 is provided on the fourth water outlet section pipe 1302.

[0053] Operation principle: When the ambient temperature around the closed cooling tower 1 is in a warm or hot environment, close the first flow regulating valve 18, open the second flow regulating valve 21 and the third flow regulating valve 22, and the external equipment will deliver water ≥45℃ to the water inlet of the coil 3. After cooling by the closed cooling tower 1, the water temperature at the water outlet of the coil 3 is ≤35℃. The water ≤35℃ can be stored in the first buffer water tank 19, and the water flow to the water inlet of the first fluid channel 11 is controlled by the first water pump 20. At this time, because the first flow regulating valve 18 is in the closed state, all the water delivered from the first outlet pipe 4 enters the first fluid channel 11. When the water enters the first fluid channel 11, the first-stage water-cooled chiller 2 Chilled water of ≤7°C is transported to the second fluid channel 12. During the process of the chilled water of ≤7°C flowing along the second fluid channel 12, the water in the first flow channel is cooled. After the cooling is completed, the water temperature of the evaporator in the first-stage water-cooled chiller 2 returned by the second fluid channel 12 is ≤17°C. At this time, cooling water of ≤32°C is transported to the condenser in the first-stage water-cooled chiller through the water accumulation tray 7 of the closed cooling tower 1. The water in the evaporator is cooled by the condenser. After cooling, the water temperature output by the condenser is ≤37°C and transported to the spray mechanism 5. After the water is sprayed by the spray mechanism 5, it is cooled to ≤32°C by the packing layer 24 and the wind body for use by the condenser in the first-stage water-cooled chiller 2;

[0054] The water in the first flow channel is cooled and outputted at a temperature of ≤15°C. The water ≤15°C is transported to the secondary air-cooled chiller 10 through the fourth outlet pipe 15 for air cooling. After cooling, the water temperature is ≤5°C and is transported to the external equipment through the fifth outlet pipe 16 for use by the external equipment.

[0055] As the temperature of the surrounding environment of the closed cooling tower 1 decreases, the first flow regulating valve 18 is opened. At this time, the water in the first water outlet pipe 4 enters the first fluid channel 11 for cooling. The other part of the water is directly mixed with the water at the outlet of the first fluid channel 11 through the connecting pipe 17. The mixed water enters the secondary air-cooled chiller 10 through the fourth water outlet pipe 15 for air cooling. After cooling, it is transported to the external equipment through the fifth water outlet pipe 16 for use by the external equipment.

[0056] When the water temperature in the first water outlet pipe 4 is lower, the first flow regulating valve 18 can be adjusted to reduce the amount of water entering the first fluid channel 11, thereby reducing the power consumption of the first-stage water-cooled chiller 2.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention upon consideration of the specification and practice of the invention herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not invented herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the appended claims.

[0058] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A large temperature difference chilled water production system, characterized in that: The method comprises a closed cooling tower and a first-stage water-cooled chiller, wherein a coil is provided in the closed cooling tower, a water inlet of the coil is used to communicate with a water outlet of an external device, the water outlet of the coil is connected with a first water outlet pipe, a spray mechanism is provided in the closed cooling tower above the coil, the spray mechanism is connected with the water outlet of the condenser in the first-stage water-cooled chiller through the first water inlet pipe, a water accumulation pan is provided at the bottom end of the closed cooling tower, the water accumulation pan is connected with the water inlet of the condenser in the first-stage water-cooled chiller through a second water outlet pipe, and the method further comprises a plate heat exchanger and a second-stage air-cooled chiller; a spray pump is provided on the second water outlet pipe; The plate heat exchanger is provided with a first fluid channel and a second fluid channel, the water inlet of the first fluid channel is connected to the water outlet of the evaporator in the first-stage water-cooled chiller through a third water outlet pipe, and the water outlet of the first fluid channel is connected to the water inlet of the evaporator in the first-stage water-cooled chiller through a second water inlet pipe; The water inlet of the second fluid channel is connected to the first water outlet pipe, the water outlet of the second fluid channel is connected to a fourth water outlet pipe, the other end of the fourth water outlet pipe is connected to the water inlet of the evaporator in the two-stage air-cooled chiller, the water outlet of the evaporator in the two-stage air-cooled chiller is connected to a fifth water outlet pipe, and the fifth water outlet pipe is used to communicate with the water inlet of an external device; The high-temperature water output by the external equipment is cooled by the coil and then flows to the first fluid channel in the plate heat exchanger. During the process of the water flowing in the first fluid channel, the evaporator in the first-stage water-cooled chiller transports chilled water to the second fluid channel in the plate heat exchanger. During the process of the chilled water flowing along the second fluid channel, it will cool the water flowing in the first fluid channel. After the cooling is completed, the water in the second fluid channel flows back to the evaporator in the first-stage water-cooled chiller, and the water in the first fluid channel flows to the second-stage air-cooled chiller, and is transported to the external equipment after being cooled by the second-stage air-cooled chiller. The water in the evaporator of the first-stage water-cooled chiller is cooled by the condenser in the first-stage water-cooled chiller. The condenser in the first-stage water-cooled chiller transports the higher temperature water to the spray mechanism, and then transports it to the condenser in the first-stage water-cooled chiller after cooling in the closed cooling tower.

2. A large temperature difference chilled water production system according to claim 1, characterized in that: The water inlet and the water outlet of the first fluid channel are connected via a connecting pipe, and a first flow regulating valve is provided on the connecting pipe; When the closed cooling tower is in a relatively cold environment, the outlet temperature of the first water outlet pipe is relatively low, and the flow rate entering the first fluid channel is reduced by adjusting the first flow regulating valve; When the closed cooling tower is in a warm or relatively hot environment, the outlet liquid temperature of the first outlet pipe is relatively high. By adjusting or closing the first flow regulating valve, the flow entering the first fluid channel is increased or all the fluid enters the first fluid channel.

3. A large temperature difference chilled water production system according to claim 2, characterized in that: The water inlet and outlet ends of the coil both extend out of the closed cooling tower; The first water outlet pipe includes a first water outlet section pipe and a second water outlet section pipe, one end of the first water outlet section pipe is flange-connected to the water outlet of the coil, the other end of the first water outlet section pipe is connected to the first buffer water tank, the water outlet of the first buffer water tank is connected to the sixth water outlet pipe, and the other end of the sixth water outlet pipe is connected to the water inlet of the first fluid channel.

4. A large temperature difference chilled water production system according to claim 3, characterized in that: A first water pump is provided at one end of the second water outlet pipe close to the first buffer water tank, a second flow regulating valve is provided at one end of the second water outlet pipe close to the plate heat exchanger, and a third flow regulating valve is provided at one end of the fourth water outlet pipe close to the plate heat exchanger; Both ends of the connecting pipe are connected to the second water outlet pipe and the fourth water outlet pipe respectively.

5. A large temperature difference chilled water production system according to claim 1, characterized in that: An air inlet is provided in the closed cooling tower above the water accumulation tray, an air inlet grille is provided on the closed cooling tower corresponding to the air inlet, a packing layer is provided in the closed cooling tower above the air inlet grille, and a cooling fan is provided at the top of the closed cooling tower.

6. A large temperature difference chilled water production system according to claim 1, characterized in that: The third water outlet pipe includes a third water outlet section pipe and a fourth water outlet section pipe. One end of the third water outlet section pipe is connected to the water outlet of the evaporator in the first-stage water-cooled chiller. The other end of the third water outlet section pipe is connected to the second buffer water tank. The water outlet of the second buffer water tank is connected to one end of the fourth water outlet section pipe. The other end of the fourth water outlet section pipe is connected to the water inlet of the second fluid channel.

7. A large temperature difference chilled water production system according to claim 6, characterized in that: The fourth water outlet pipe is provided with a freezing pump.

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