Large-temperature-difference chilled water preparation system

Abstract

The invention relates to the technical field of chilled water preparation, in particular to a large-temperature-difference chilled water preparation system which comprises a closed cooling tower provided with a coil pipe and a first-stage water-cooled water chilling unit, a spraying mechanism is arranged in the closed cooling tower and communicated with the first-stage water-cooled water chilling unit, and a water collecting disc is arranged at the bottom end in the closed cooling tower and communicated with the first-stage water-cooled water chilling unit. The water collecting disc is communicated with the first-stage water-cooled water chilling unit, and the system further comprises a plate heat exchanger and a second-stage air-cooled water chilling unit; a spraying pump is arranged on the second water outlet pipe; the plate heat exchanger comprises a first fluid channel and a second fluid channel, and the first fluid channel and the first-stage water-cooled water chilling unit form water circulation; a water inlet of the second fluid channel is communicated with a water outlet of the coil pipe, a water outlet of the second fluid channel is communicated with the second-stage air-cooled water chilling unit, and the second-stage air-cooled water chilling unit is used for being communicated with a water inlet of external equipment.

Description

Technical Field

[0001] The invention relates to a chilled water preparation system, in particular to a chilled water preparation system with a large temperature difference. 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℃, there will be a large temperature difference in certain 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 comprises a closed cooling tower and a primary water-cooled chiller, wherein a coil is arranged 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 with a first water outlet pipe, a spray mechanism is arranged in the closed cooling tower above the coil, the spray mechanism is connected with the water outlet of a condenser in the primary water-cooled chiller through the first water inlet pipe, a water accumulation pan is arranged at the bottom end of the closed cooling tower, the water accumulation pan is connected with the water inlet of the condenser in the primary water-cooled chiller through a second water outlet pipe, and the closed cooling tower is characterized in that it also comprises a plate heat exchanger and a secondary air-cooled chiller; a spray pump is arranged on the second water outlet pipe;

[0008] The plate heat exchanger comprises 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 primary 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 primary 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 device is cooled by the coil and then flows to the first fluid channel in the plate heat exchanger. During the flow of the water in the first fluid channel, the evaporator in the primary water-cooled chiller delivers chilled water to the second fluid channel in the plate heat exchanger. During the flow of the chilled water along the second fluid channel, the water flowing in the first fluid channel is cooled. After the cooling is completed, the water in the second fluid channel flows back to the evaporator in the primary water-cooled chiller, and the water in the first fluid channel flows to the secondary air-cooled chiller, and is delivered to the external device after being cooled by the secondary air-cooled chiller.

[0011] The cooling of water in the evaporator of the primary water-cooled chiller is achieved through the condenser of the primary water-cooled chiller. The condenser of the primary water-cooled chiller transports the water with a higher temperature to the spray mechanism, and then transports the water to the condenser of the primary water-cooled chiller after being cooled by the closed cooling tower.

[0012] Through the above technical scheme, through the setting of the closed cooling tower, the coil in the closed cooling tower can cool the circulating water in the system, and 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 primary water-cooled chiller, so that the closed cooling tower can achieve multiple uses, thereby reducing equipment investment and energy consumption;

[0013] Because the spray mechanism is directly connected to the condenser in the primary water-cooled chiller, the end of the spray mechanism can spray through the residual pressure of the condenser. The spray water evaporates and cools the tube bundle. At the same time, after the temperature drops, it falls into the water accumulation tray 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 by 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, an external device delivers water above 45°C to a closed cooling tower. The water temperature after cooling by the closed cooling tower is generally below 35°C. The water body is cooled once by the closed cooling tower at the front end of the cooling system, so that the high-temperature water body can 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 cold sources 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 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 water temperature after cooling 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 the system, thereby 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, and the flow rate entering the first fluid channel is increased or all flows into the first fluid channel by adjusting or closing the first flow regulating valve.

[0019] Through the above technical scheme, 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 arranged in the closed cooling tower above the water accumulation tray, an air inlet grille is arranged on the closed cooling tower corresponding to the air inlet, a packing layer is arranged in the closed cooling tower above the air inlet grille, and a cooling fan is arranged 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 primary 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 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 primary water-cooled chiller, so that the closed cooling tower can achieve multiple uses, thereby reducing equipment investment and energy consumption;

[0027] Because the spray mechanism is directly connected to the condenser in the primary water-cooled chiller, the end of the spray mechanism can spray through the residual pressure of the condenser. The spray water evaporates and cools the tube bundle. At the same time, after the temperature drops, it falls into the water accumulation tray 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 by 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, an external device delivers water above 45°C to a closed cooling tower. The water temperature after cooling by the closed cooling tower is generally below 35°C. The water body is cooled once by the closed cooling tower at the front end of the cooling system, so that the high-temperature water body can 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 cold sources 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, but the water below 35°C is transported to the first fluid channel in the plate heat exchanger. At this time, a water cycle 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 water temperature after cooling 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, 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 effects.

[0031] It is to 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 It is a connection diagram of a large temperature difference chilled water production system;

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

[0035] Figure 3It 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 It is a schematic diagram of water flow direction when the first flow regulating valve is in a closed state in a large temperature difference chilled water production system;

[0037] In the figure, 1, closed cooling tower; 2, primary water-cooled chiller; 3, coil; 4, first water outlet pipe; 401, first water outlet section pipe; 402, second water outlet section pipe; 5, spray mechanism; 6, first water inlet pipe; 7, water accumulation tray; 8, second water outlet pipe; 9, plate heat exchanger; 10, secondary air-cooled chiller; 11, first fluid channel; 12, second fluid channel; 13, third water outlet pipe; 1301, third water outlet 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 shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0039] In a 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 arranged in the closed cooling tower 1, a water inlet of the coil 3 is used to communicate with a water outlet of an external device, and a first water outlet pipe 4 is connected to the water outlet of the coil 3, a spray mechanism 5 is arranged in the closed cooling tower 1 above the coil 3, and the spray mechanism 5 is connected to the water outlet of the condenser in the primary water-cooled chiller 2 through the first water inlet pipe 6, a water accumulation pan 7 is arranged at the bottom end of the closed cooling tower 1, and the water accumulation pan 7 is connected to the water inlet of the condenser in the primary water-cooled chiller 2 through the second water outlet pipe 8, and a spray pump 28 is arranged 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, 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, and the fifth water outlet pipe 16 is used to communicate with the water inlet of the external device;

[0042] The high-temperature water outputted 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 flow of the water in the first fluid channel 11, the evaporator in the primary water-cooled chiller 2 delivers chilled water to the second fluid channel 12 in the plate heat exchanger 9. During the flow of the chilled water 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, and is delivered to the external device after being cooled by the secondary air-cooled chiller 10.

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

[0044] The coil 3 of the closed cooling tower 1 can cool the circulating water in the system. Through the arrangement of the spray mechanism 5 in the closed cooling tower 1, the water flowing out of 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 in the primary water-cooled chiller 2, the end of the spray mechanism 5 can be sprayed by the residual pressure of the condenser in the primary water-cooled chiller 2, and the spray water evaporates and cools the tube bundle. At the same time, the temperature drops and falls into the water accumulation tray 7 to enter the condenser in the primary water-cooled chiller 2 for use, thereby greatly improving the working efficiency of the cooling pump of the condenser in the primary water-cooled chiller 2; in addition, through the residual pressure spraying, the cooling tower spray pump required by the spray mechanism in the closed cooling tower 1 can be omitted, thereby reducing the power consumption of the system;

[0046] The external equipment delivers water above 45°C to the closed cooling tower 1. The water temperature after cooling by the closed cooling tower 1 is generally below 35°C. The closed cooling tower 1 at the front end of the cooling system cools the water 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 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 11 is below 15°C. At this time, the water body can enter the air-cooled chiller for cooling. The water temperature after cooling 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 the system to complete the large temperature difference cooling, thereby reducing the energy consumption of the system, thereby achieving energy saving effect.

[0048] The water inlet and the water outlet of the first fluid channel 11 are connected through 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 relatively low, and the flow rate entering the first fluid channel 11 is reduced by adjusting the first flow regulating valve 18; when the closed cooling tower 1 is in a warm or hot environment, the outlet temperature of the first water outlet pipe 4 is relatively high, and the flow rate entering the first fluid channel 11 is increased or all enters the first fluid channel 11 by adjusting or closing the first flow regulating valve 18; the temperature of the water after cooling 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 first water outlet pipe 4 is reduced, the first flow regulating valve 18 is adjusted to reduce the amount of water entering the first fluid channel 11, which 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 effect.

[0049] The water inlet and outlet ends of the coil 3 both extend out of 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 one 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 one 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 one end of the fourth water outlet pipe 15 close to the plate heat exchanger 9; both 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 arranged in the closed cooling tower 1 above the water accumulation tray 7, an air inlet grille 23 is arranged on the closed cooling tower 1 corresponding to the air inlet, a packing layer 24 is arranged in the closed cooling tower 1 above the air inlet grille 23, and a cooling fan 25 is arranged 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 arranged 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 device will transport 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 a closed state, all the water transported from the first outlet pipe 4 enters the first fluid channel 11. When the water enters the first fluid channel 11, the primary 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 through the condenser. After the cooling, the water temperature output by the condenser is ≤37°C and transported to the spray mechanism 5. After the water of ≤37°C is sprayed by the spray mechanism 5, it is cooled to ≤32°C through 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 has an output temperature of ≤15°C after being cooled. The water with a temperature of ≤15°C is transported to the two-stage air-cooled chiller 10 through the fourth water outlet pipe 15 for air cooling. The water temperature after cooling is ≤5°C and is transported to the external equipment through the fifth water outlet pipe 16 for use by the external equipment.

[0055] As the environment around 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, and 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 two-stage 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 primary water-cooled chiller 2.

[0057] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing 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 present invention and include common knowledge or customary techniques in the art that the present invention did not invent. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0058] It should be understood that the present invention is not limited to the exact construction that has been 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, It is characterized in that It comprises a closed cooling tower and a primary water-cooled chiller, wherein a coil is arranged in the closed cooling tower, wherein a water inlet of the coil is used to communicate with a water outlet of an external device, wherein a water outlet of the coil is communicated with a first water outlet pipe, wherein a spray mechanism is arranged in the closed cooling tower above the coil, wherein the spray mechanism is communicated with a water outlet of a condenser in the primary water-cooled chiller through the first water inlet pipe, wherein a water accumulation pan is arranged at the bottom end of the closed cooling tower, wherein the water accumulation pan is communicated with a water inlet of the condenser in the primary water-cooled chiller through a second water outlet pipe, wherein the closed cooling tower further comprises a plate heat exchanger and a secondary air-cooled chiller; wherein a spray pump is arranged 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 primary 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 primary 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 device is cooled by the coil and then flows to the first fluid channel in the plate heat exchanger. During the flow of the water in the first fluid channel, the evaporator in the primary water-cooled chiller delivers chilled water to the second fluid channel in the plate heat exchanger. During the flow of the chilled water along the second fluid channel, the water flowing in the first fluid channel is cooled. After the cooling is completed, the water in the second fluid channel flows back to the evaporator in the primary water-cooled chiller, and the water in the first fluid channel flows to the secondary air-cooled chiller, and is delivered to the external device after being cooled by the secondary air-cooled chiller. The cooling of water in the evaporator of the primary water-cooled chiller is achieved through the condenser of the primary water-cooled chiller. The condenser of the primary water-cooled chiller transports the water with a higher temperature to the spray mechanism, and then transports the water to the condenser of the primary water-cooled chiller after being cooled by the closed cooling tower.

2. A large temperature difference chilled water production system according to claim 1, It is 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, and the flow rate entering the first fluid channel is increased or all flows into the first fluid channel by adjusting or closing the first flow regulating valve.

3. A large temperature difference chilled water production system according to claim 2, It is 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, It is 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; Two ends of the connecting pipe are respectively connected to the second water outlet pipe and the fourth water outlet pipe.

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

6. A large temperature difference chilled water production system according to claim 1, It is 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 primary 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.

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

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