Energy-saving device of circulating cooling water system

Abstract

The utility model discloses an energy-saving device of a circulating cooling water system, and relates to the technical field of water treatment. Comprising a circulating water pool, a cooling tower is fixedly arranged at the upper end of the circulating water pool, a speed reducer is arranged in the cooling tower, a fan is fixedly arranged at the output end of the speed reducer, and a grating, a water suction pool, a circulating water pump, an outlet valve, a water supply pipeline, a heat exchanger, a water return pipeline and a water turbine are fixedly arranged on one side of the circulating water pool in sequence; the output end of the water turbine is fixedly provided with a double-extension shaft, one end of the double-extension shaft is fixedly provided with a coupling, the coupling is connected with a speed reducer, the coupling is matched with the speed reducer for use, the other end of the double-extension shaft is connected with a generator, and the other end of the speed reducer is connected with a fan. The cooling tower fan is driven by the water turbine, and the power generation technology is combined, so that the problems that a water return pipeline is subjected to pressure building through a tower return valve and the tower return valve is easy to damage due to scouring are solved, and the residual pressure and residual energy of circulating cooling water can be perfectly recycled.

Description

Technical Field

[0001] The present application relates to the technical field of water treatment, and in particular to an energy-saving device for a circulating cooling water system. Background Art

[0002] At present, open circulating cooling water systems are widely used in the domestic chemical industry. The open circulating cooling water system mainly cools the hot water returned from the chemical production system through the cooling tower, and then the cold water enters the circulating water pool, and then the circulating water pump boosts the pressure and sends it to the heat exchanger of each process device, and exchanges heat with the process medium inside the heat exchanger. The hot water after heat exchange enters the cooling tower through the return water pipe, and the motor drives the fan to cool the hot water in the cooling tower. This process is repeated continuously. During the circulation process, due to evaporative heat dissipation, sewage discharge, leakage and other reasons, the system's water volume will gradually decrease, so some fresh water needs to be added to keep the system water volume unchanged. This process has the characteristics of stable operation, low operating cost and low water consumption. During the circulation process, the cold water needs to be pressurized and sent to each heat exchanger in the production system, and returns to the cooling tower after heat exchange in the heat exchanger, so the feed water pressure and return water pressure need to be strictly controlled. The feed water pressure is mainly determined by the height of the highest heat exchanger in the system and the resistance of the feed water pipeline, and the return water pressure is mainly determined by the opening of the system return tower valve and the resistance of the return water pipeline. In normal production, the system heat exchanger height and pipeline resistance are basically constant, and the return water pressure is mainly adjusted by holding the pressure of the return tower valve.

[0003] However, the prior art still has the following problems:

[0004] Since the cooling tower fan needs to be driven by an electric motor, the required speed and power are greatly affected by temperature changes. When the temperature is low in winter, the cooling tower fan does not even need to operate, but when the temperature is high in summer, it needs to operate at full load. If only a turbine is used instead of a motor to drive the cooling tower, the circulating cooling water flow rate will be very large during operation, and the return valve will be easily eroded and damaged, and using the valve to hold the pressure will cause a large amount of residual pressure loss.

[0005] In view of the above problems, the inventors proposed an energy-saving device for a circulating cooling water system. Summary of the invention

[0006] In order to solve the problem that the residual pressure cannot be fully utilized, the utility model aims to provide an energy-saving device for a circulating cooling water system.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A circulating cooling water system energy-saving device comprises a circulating water pool, a cooling tower is fixedly provided at the upper end of the circulating water pool, a reducer is provided inside the cooling tower, a fan is fixedly provided at the output end of the reducer, a grille is fixedly provided at one side of the circulating water pool, a water suction tank is fixedly provided at one side of the grille, a circulating water pump is fixedly provided at one side of the water suction tank, an outlet valve is fixedly provided at one end of the circulating water pump for adjusting the flow rate and pipeline pressure of the circulating water pump, a water supply pipe is fixedly provided at one end of the outlet valve, a heat exchanger is fixedly provided at one end of the water supply pipe, a return water pipe is fixedly provided at one end of the heat exchanger, a water turbine is fixedly provided at one end of the return water pipe, a generator is fixedly provided at one side of the water turbine, a double-extension shaft is fixedly provided at the output end of the water turbine, a coupling is fixedly provided at one end of the double-extension shaft, and the coupling is used in conjunction with the reducer.

[0009] Preferably, a water supply pressure gauge is fixedly provided on the outer surface of the water supply pipe, and the water supply pressure gauge is used in conjunction with the water supply pipe, a return water pressure gauge is fixedly provided on the outer surface of the return water pipe, and the return water pressure gauge is used in conjunction with the return water pipe, a balancing valve is fixedly provided on the outer surface of the return water pipe, and the balancing valve is used in conjunction with the return water pipe, one end of the return water pipe is connected to the inner wall of the cooling tower, a power generating cabinet is fixedly provided on one side of the generator, and the power generating cabinet is used in conjunction with the generator, a water supply pipe is fixedly provided on one side of the circulating water pool, and the water supply pipe is used in conjunction with the circulating water pool, due to evaporative heat dissipation, sewage discharge, leakage and other reasons, the water volume retained in the system will gradually decrease, so it is necessary to use a water supply pipe to supplement a small amount of fresh water to the circulating water pool to maintain the water volume in the system unchanged to ensure that the entire system is repeated, and the two ends of the heat exchanger are respectively connected to one end of the water supply pipe and the return water pipe by flanges.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] This application uses a circulating water pump to pressurize the cold water in the suction pool and send it to the water supply pipe. The cold water enters the heat exchanger through the water supply pipe to exchange heat with the process medium, and becomes hot water to enter the return water pipe. The hot water enters the turbine through the return water pipe, driving the turbine to rotate and do work. After the hot water has done work, it enters the cooling tower, and becomes cold water after evaporation and cooling in the cooling tower. It enters the circulating water pool under the action of gravity, and this process is repeated continuously. At the same time, the turbine uses a double-extended shaft, one end of which is connected to the cooling tower fan reducer and the other end is connected to the generator. Therefore, when the power of the turbine is greater than the power required by the cooling tower fan, the excess energy generated by the turbine can be converted into electrical energy by using the generator. The cooling tower fan is driven by the turbine and combined with power generation technology, which not only solves the problem that the return water pipeline is easily damaged by the pressure buildup and flushing of the return tower valve, but also can perfectly recycle the excess pressure and energy of the circulating cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings are used to provide a further understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation to the present application.

[0013] Figure 1 It is a schematic diagram of the structure of the utility model.

[0014] Figure 2 It is a partial structural schematic diagram of the utility model.

[0015] Figure 3 It is a partial structural schematic diagram of the utility model.

[0016] In the figure:

[0017] 1. Circulating water pool; 2. Screen; 3. Suction pool; 4. Circulating water pump; 5. Outlet valve; 6. Water supply pipe; 7. Water supply pressure gauge; 8. Heat exchanger; 9. Return water pipe; 10. Return water pressure gauge; 11. Balancing valve; 12. Turbine; 13. Double extension shaft; 14. Coupling; 15. Reducer; 16. Fan; 17. Generator; 18. Generator cabinet; 19. Water supply pipe; 20. Cooling tower. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of this application, unless otherwise specified, "plurality" means two or more.

[0020] Example 1

[0021] like Figure 1-3As shown, the utility model provides an energy-saving device for a circulating cooling water system, comprising a circulating water pool 1, a cooling tower 20 is fixedly arranged at the upper end of the circulating water pool 1, a reducer 15 is arranged inside the cooling tower 20, a fan 16 is fixedly arranged at the output end of the reducer 15, a grille 2 is fixedly arranged at one side of the circulating water pool 1, a water suction pool 3 is fixedly arranged at one side of the grille 2, a circulating water pump 4 is fixedly arranged at one end of the circulating water pump 4, an outlet valve 5 is fixedly arranged at one end of the outlet valve 5, a water supply pipe 6 is fixedly arranged at one end of the water supply pipe 6, a heat exchanger 8 is fixedly arranged at one end of the heat exchanger 8, a return water pipe 9 is fixedly arranged at one end of the return water pipe 9, a turbine 12 is fixedly arranged at one end of the return water pipe 9, a double-extended shaft 13 is fixedly arranged at the output end of the turbine 12, a coupling 14 is fixedly arranged at one end of the double-extended shaft 13, the coupling 14 is connected to the reducer 15, and the coupling 14 and the reducer 15 are used in combination, the other end of the double-extended shaft 13 is connected to a generator 17, and the reducer 15 is connected to the fan 16.

[0022] The circulating water pump 4 is connected to the suction tank 3 by a pipeline, the outlet pipeline of the circulating water pump 4 is equipped with an outlet valve 5, the outlet valve 5 is connected to the water supply pipeline 6 by a flange, the water supply pipeline 6 is equipped with a water supply pressure gauge 7, the return water pipeline 9 is connected to the turbine 12 by a flange, and the return water pipeline 9 is connected to the balancing valve 11 in parallel with the outlet pipeline of the turbine 12.

[0023] The grid 2 is set to 5 cm in width.

[0024] A water supply pressure gauge 7 is fixedly provided on the outer surface of the water supply pipe 6 , and the water supply pressure gauge 7 is used in conjunction with the water supply pipe 6 .

[0025] By adopting the above technical solution, the water pressure in the water supply pipe 6 can be observed through the water supply pressure gauge 7 .

[0026] A return water pressure gauge 10 is fixedly provided on the outer surface of the return water pipe 9 , and the return water pressure gauge 10 is used in conjunction with the return water pipe 9 .

[0027] By adopting the above technical solution, the water pressure in the return water pipe 9 can be observed through the return water pressure gauge 10 .

[0028] A balancing valve 11 is fixedly provided on the outer surface of the return water pipe 9 , and the balancing valve 11 is used in conjunction with the return water pipe 9 .

[0029] By adopting the above technical solution, the balance of the water pressure in the return water pipe 9 can be controlled by the balance valve 11 .

[0030] One end of the return water pipe 9 leads into the cooling tower 20 , and the outer wall of the return water pipe 9 is connected to the inner wall of the cooling tower 20 .

[0031] By adopting the above technical solution, the return water pipe 9 can transport water to the cooling tower 20 .

[0032] A power generation cabinet 18 is fixedly provided on one side of the generator 17 , and the power generation cabinet 18 is used in conjunction with the generator 17 .

[0033] By adopting the above technical solution, the generator 17 can be connected to the power generation cabinet 18 after generating electricity, so as to facilitate the operation of the staff.

[0034] A water supply pipe 19 is connected to one side of the circulating water pool 1 , and the water supply pipe 19 is used in conjunction with the circulating water pool 1 .

[0035] By adopting the above technical solution, the amount of water retained in the system will gradually decrease due to evaporative heat dissipation, sewage discharge, leakage, etc., so it is necessary to use the water supply pipe 19 to add a small amount of fresh water to the circulating water pool 1 to maintain the water volume in the system unchanged to ensure that the entire system is repeated.

[0036] Both ends of the heat exchanger 8 are connected to one end of the water supply pipe 6 and one end of the water return pipe 9 by flanges.

[0037] By adopting the above technical solution, the heat exchanger 8, the water supply pipe 6 and the return water pipe 9 can be connected more firmly.

[0038] Working principle:

[0039] When the energy-saving device of the circulating cooling water system is in operation, the circulating water pool 1 is used to collect the cold water after the cooling tower 20 cools down. The grille 2 connects the circulating water pool 1 and the water absorption pool 3, and can filter mechanical impurities. The circulating water pump 4 is connected to the water absorption pool 3 with a pipe of model DN1000. The outlet pipe of the circulating water pump 4 is equipped with an outlet valve 5, which can adjust the flow rate and pipeline pressure of the circulating water pump 4. The circulating water pump 4 pressurizes the cold water in the water absorption pool 3 to 0.4-0.45MPa, and adjusts the flow rate through the outlet valve 5. At this time, the flow rate can be adjusted to 180000-20000m3 / h. The pressurized cold water is discharged from the water supply pipe. The cold water is converted into hot water through the return pipe 9. At this time, under the residual pressure of the hot water in the return pipe 9, the hot water drives the turbine 12 to rotate and do work. The power generated by the turbine 12 drives the reducer 15 first to ensure the required speed of the fan 16. When the power generated by the turbine 12 is greater than the power required by the fan 16, the residual energy can be connected to the generator cabinet 18 after being generated by the generator 17. The hot water that has done work enters the cooling tower 20, and becomes cold water after evaporation and cooling in the cooling tower 20. The cold water enters the circulating water pool 1 under the action of gravity, and this process is repeated.

[0040] The above embodiments are only used to illustrate the technical solution of the present application, but not to limit it. The present application is not limited to the exact structure described above and illustrated in the accompanying drawings, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, various changes and modifications made without departing from the concept of the present application should be deemed to belong to the protection scope of the present application.

Claims

1. A circulating cooling water system energy-saving device, comprising a circulating water pool (1), characterized in that: A cooling tower (20) is fixedly provided at the upper end of the circulating water pool (1), a reducer (15) is provided inside the cooling tower (20), a fan (16) is fixedly provided at the output end of the reducer (15), a grille (2) is fixedly provided at one side of the circulating water pool (1), a water suction pool (3) is fixedly provided at one side of the grille (2), a circulating water pump (4) is fixedly provided at one side of the water suction pool (3), an outlet valve (5) is fixedly provided at one end of the circulating water pump (4), a water supply pipe (6) is fixedly provided at one end of the outlet valve (5), and a water supply pipe (6) is fixedly provided at one end of the water supply pipe (6). A heat exchanger (8) is fixedly provided, a return water pipe (9) is fixedly provided at one end of the heat exchanger (8), a water turbine (12) is fixedly provided at one end of the return water pipe (9), a double-extension shaft (13) is fixedly provided at the output end of the water turbine (12), a coupling (14) is fixedly provided at one end of the double-extension shaft (13), the coupling (14) is connected to a reducer (15), and the coupling (14) and the reducer (15) are used in combination, the other end of the double-extension shaft (13) is connected to a generator (17), and the other end of the reducer (15) is connected to a fan (16).

2. The energy-saving device according to claim 1, characterized in that: The outlet valve (5) and the water supply pipe (6) are connected by a flange.

3. The energy-saving device according to claim 1, characterized in that: A water supply pressure gauge (7) is fixedly provided on the outer surface of the water supply pipe (6).

4. The energy-saving device according to claim 1, characterized in that: A return water pressure gauge (10) is fixedly provided on the outer surface of the return water pipe (9).

5. The energy-saving device according to claim 1, characterized in that: A balancing valve (11) is fixedly provided on the outer surface of the return water pipe (9).

6. The energy-saving device according to claim 1, characterized in that: One end of the return water pipe (9) leads into the cooling tower (20), and the outer wall of the return water pipe (9) is connected to the inner wall of the cooling tower (20).

7. The energy-saving device according to claim 1, characterized in that: A power generation cabinet (18) is fixedly provided on one side of the generator (17), and the power generation cabinet (18) is used in conjunction with the generator (17).

8. The energy-saving device according to claim 1, characterized in that: A water supply pipe (19) is fixedly provided on one side of the circulating water pool (1).

9. The energy-saving device according to claim 1, characterized in that: Both ends of the heat exchanger (8) are connected to one end of a water supply pipe (6) and a water return pipe (9) respectively by flanges.

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