Cooling return water recycling system

Abstract

The embodiment of the utility model discloses a cooling return water recycling system which comprises a cooling water pipeline, a first cooling water utilization device, a second cooling water utilization device and a water storage device. The cooling water pipeline, the first cooling water utilization device and the water storage device are sequentially connected, and a first valve is arranged on the pipeline for connecting the first cooling water utilization device and the water storage device; the cooling water pipeline, the second cooling water utilization device and the water storage device are connected in sequence; a second valve is arranged on a pipeline for connecting the cooling water pipeline with the second cooling water utilization device; the first cooling water utilization device is further connected with the second cooling water utilization device, and a third valve is arranged on a pipeline connecting the first cooling water utilization device and the second cooling water utilization device. Drainage water of the first cooling water utilization device can be reused in the second cooling water utilization device, it is guaranteed that the water level of the water storage device is still controllable when a large amount of water is used by the cooling water utilization devices, and the total water consumption of cooling water is reduced.

Description

Technical Field

[0001] The embodiments of this specification belong to the technical field of cold source utilization, and specifically relate to a water supply pump cooling return water reuse system. Background Art

[0002] In industrial production, a large amount of cooling water is often needed to cool machinery or working fluids, and the amount of cooling water used is usually not constant. If the water consumption suddenly reaches a peak, it will cause the cooling water in the water storage device to overflow. At this time, if the water consumption of some cooling water utilization devices is turned off or reduced, it will cause high-temperature wear or damage to the machine, high-temperature gas leakage, and more seriously endanger the safety and health of employees. If the water storage device is expanded according to the highest water demand during peak periods, the device will be idle most of the time, resulting in a waste of resources. Therefore, there is an urgent need for a cooling return water reuse system that can take into account the cooling water consumption during peak and off-peak periods. Summary of the invention

[0003] The embodiments of the present specification provide a cooling water return reuse system, which can take into account the different water consumption demands of cooling water during peak and off-peak periods while ensuring that the water level of the water storage device is within a normal range.

[0004] The embodiment of this specification provides a cooling return water reuse system, including: a cooling water pipeline, a first cooling water utilization device, a second cooling water utilization device, and a water storage device;

[0005] The cooling water pipeline, the first cooling water utilization device, and the water storage device are connected in sequence, and a first valve is provided on the pipeline connecting the first cooling water utilization device and the water storage device;

[0006] The cooling water pipeline, the second cooling water utilization device, and the water storage device are connected in sequence; a second valve is provided on the pipeline connecting the cooling water pipeline and the second cooling water utilization device;

[0007] The first cooling water utilization device is also connected to the second cooling water utilization device, and a third valve is provided on the pipeline connecting the first cooling water utilization device and the second cooling water utilization device.

[0008] As a preferred solution, a fourth valve is provided on the pipeline connecting the cooling water pipeline and the first cooling water utilization device.

[0009] As a preferred embodiment, the pipeline connecting the first cooling water utilization device and the second cooling water utilization device is a branch pipeline of the pipeline connecting the first cooling water utilization device and the water storage device, and the branch point of the branch pipeline is located at the upstream end of the first valve.

[0010] As a preferred solution, a fifth valve is further provided on the pipeline connecting the first cooling water utilization device and the water storage device, and the branch point of the branch pipeline is located at the downstream end of the fifth valve.

[0011] As a preferred embodiment, the branch pipe is connected to the pipe connecting the cooling water pipe and the second cooling water utilization device, and the connection point between the branch pipe and the pipe connecting the cooling water pipe and the second cooling water utilization device is located at the downstream end of the second valve.

[0012] As a preferred embodiment, a thermometer is provided in the second cooling water utilization device.

[0013] As a preferred solution, a first water level gauge is provided in the water storage device.

[0014] As a preferred solution, the second cooling water utilization device is connected to the water storage device through a buffer water tank.

[0015] As a preferred solution, a sixth valve is provided on the connecting pipe between the buffer water tank and the water storage and recovery device, and a second water level gauge is provided in the buffer water tank.

[0016] As a preferred solution, a sprayer is provided on the top of the second cooling water utilization device, the cooling water pipeline and the first cooling water utilization device are connected to the sprayer inside the second cooling water utilization device, and a spray flow rate regulating valve is provided in the sprayer.

[0017] The beneficial effects brought by the technical solutions provided by some embodiments of this specification include at least:

[0018] By introducing cooling water from the first cooling water utilization device to the second cooling water utilization device, the water use of each cooling water utilization device is guaranteed, and the storage problem of different cooling water discharge volumes during peak and off-peak periods of cooling water use is effectively solved. At the same time, due to the reuse of cooling water, the total cooling water consumption is reduced, achieving good results of energy saving, emission reduction and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this specification, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the structure of a cooling return water reuse system provided in an embodiment of this specification.

[0021] In the figure: 1. first valve; 2. second valve; 3. third valve; 4. fourth valve; 5. fifth valve; 6. sixth valve; 7. cooling water pipeline; 8. first cooling water utilization device; 9. water storage device; 10. second cooling water utilization device; 11. buffer water tank. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of this specification will be described clearly and completely below in conjunction with the drawings in the embodiments of this specification.

[0023] The terms "first", "second", "third", etc. in the description and claims of this specification and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0024] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Changes may be made to the functions and arrangements of the elements described without departing from the scope of the present specification. Various processes or components may be appropriately omitted, substituted or added to each example. For example, the described method may be performed in an order different from the order described, and various steps may be added, omitted or combined. In addition, features described with respect to some examples may be combined in other examples.

[0025] See also Figure 1 , Figure 1 A schematic diagram of the structure of a cooling return water reuse system provided in an embodiment of this specification is shown.

[0026] like Figure 1 As shown, the system may at least include a cooling water pipeline 7, a first cooling water utilization device 8, a second cooling water utilization device 10, and a water storage device 9;

[0027] The cooling water pipeline 7, the first cooling water utilization device 8, and the water storage device 9 are connected in sequence, and a first valve 1 is provided on the pipeline connecting the first cooling water utilization device 8 and the water storage device 9;

[0028] The cooling water pipeline 7, the second cooling water utilization device 10, and the water storage device 9 are connected in sequence; a second valve 2 is provided on the pipeline connecting the cooling water pipeline 7 and the second cooling water utilization device 10;

[0029] The first cooling water utilization device 8 is also connected to the second cooling water utilization device 10 , and a third valve 3 is provided on the pipeline connecting the first cooling water utilization device 8 and the second cooling water utilization device 10 .

[0030] It can be seen that in the cooling return water reuse system provided by the present invention, cooling water can flow from the cooling water pipe 7 into the first cooling water utilization device 8, and cooling water can also flow from the cooling water pipe 7 into the second cooling water utilization device 10. During non-peak water use periods, the first cooling water utilization device 8 and the second cooling water utilization device 10 will directly discharge water into the water storage device 9 after using water; when encountering a peak cooling water use period, the third valve 3 can be opened to discharge the cooling water used by the first cooling water utilization device 8 into the second cooling water utilization device 10, so that the cooling water can be reused. In this way, the water consumption of the device can be guaranteed and the total cooling water usage can be reduced.

[0031] See also Figure 1 As shown, in one embodiment of the present specification, a fourth valve 4 is provided on the pipeline connecting the cooling water pipeline 7 and the first cooling water utilization device 8 .

[0032] It is understandable that the first cooling water utilization device 8 is not always in a water-using state, and the cooling water flowing into the first cooling water utilization device 8 can be conveniently opened or closed by the fourth valve 4 .

[0033] See also Figure 1 As shown, in one embodiment of the present specification, the pipe connecting the first cooling water utilization device 8 and the second cooling water utilization device 10 is a branch pipe of the pipe connecting the first cooling water utilization device 8 and the water storage device 9, and the branch point of the branch pipe is located at the upstream end of the first valve 1.

[0034] It can be understood that opening the third valve 3 can connect the first cooling water utilization device 8 with the second cooling water utilization device 10. The branch point of the branch pipe is located at the upstream end of the first valve 1. The first valve 1 can then cut off the discharge of cooling water from the first cooling water utilization device 8 into the water storage device 9 without affecting the flow of cooling water from the first cooling water utilization device 8 into the second cooling water utilization device 10.

[0035] See also Figure 1 As shown, in one embodiment of the present specification, a fifth valve 5 is further provided on the pipeline connecting the first cooling water utilization device 8 and the water storage device 9 , and the branch point of the branch pipeline is located at the downstream end of the fifth valve 5 .

[0036] It can be seen that the fifth valve 5 is located upstream of the third valve 3 and the first valve 1. After closing the fifth valve 5, the cooling water of the first cooling water utilization device 8 will not be discharged to other devices; when cooling water contamination occurs in the first cooling water utilization device 8, the fifth valve 5 can be directly cut off to prevent the cooling water from flowing into other devices.

[0037] See also Figure 1 As shown, in one embodiment of the present specification, the branch pipe is connected to the pipe connecting the cooling water pipe 7 and the second cooling water utilization device 10, and the connection point between the branch pipe and the pipe connecting the cooling water pipe 7 and the second cooling water utilization device 10 is located at the downstream end of the second valve 2.

[0038] It can be seen that the second valve 2 only controls the connection between the cooling water pipeline 7 and the second cooling water utilization device 10, and does not control the connection between the first cooling water utilization device 8 and the second cooling water utilization device 10; that is, when the cooling water of the first cooling water utilization device 8 flows into the second cooling water utilization device 10, the second valve 2 can be closed, so that the second cooling water utilization device 10 will no longer use the cooling water in the cooling water pipeline 7.

[0039] See also Figure 1 As shown, in one embodiment of the present specification, a thermometer is provided in the second cooling water utilization device 10 .

[0040] It is understandable that the cooling water utilization device has certain requirements on the temperature of the cooling water. Providing a thermometer in the second cooling water utilization device 10 can better control the temperature of the cooling water in the second cooling water utilization device 10.

[0041] See also Figure 1 As shown, in one embodiment of the present specification, a first water level gauge is provided in the water storage device 9 .

[0042] It is understandable that during the peak period of cooling water usage, the cooling water in the water storage device 9 is likely to be too high and overflow. Installing a water level meter in the water storage device 9 can predict risks in advance and make interventions.

[0043] See also Figure 1 As shown, in one embodiment of the present specification, the second cooling water utilization device 10 is connected to the water storage device 9 through a buffer water tank 11 .

[0044] It is understandable that during the peak period of cooling water usage, if the water level in the water storage device 9 is already too high, but in order not to affect normal production, a buffer water tank 11 can be set downstream of the second cooling water utilization device 10. After the cooling water in the water storage device 9 is cleaned, the cooling water in the buffer water tank 11 can be discharged into the water storage device 9.

[0045] See also Figure 1 As shown, in one embodiment of the present specification, a sixth valve 6 is provided on the connecting pipe between the buffer water tank 11 and the water storage device 9 , and a second water level gauge is provided in the buffer water tank 11 .

[0046] It is understandable that when the water level in the water storage device 9 is too high, the sixth valve 6 can be closed to temporarily store the cooling water discharged from the cooling water utilization device in the buffer water tank 11 to reduce the water storage pressure of the water storage device 9.

[0047] Especially for situations where a large amount of water is used, such as when equipment is started or stopped, the water storage pressure of the water storage device 9 can be reduced on the basis of ensuring sufficient water consumption of the second cooling water utilization device 10 .

[0048] In order to prevent the water level in the buffer water tank 11 from being too high, a water level gauge may also be provided in the buffer water tank 11 .

[0049] See also Figure 1 As shown, in one embodiment of the present specification, a sprinkler is provided on the top of the second cooling water utilization device 10, the cooling water pipeline 7 and the first cooling water utilization device 8 are both connected to the sprinkler inside the second cooling water utilization device 10, and a sprinkler flow rate regulating valve is provided in the sprinkler.

[0050] It is understandable that the cooling water pipe 7 and the first cooling water utilization device 8 are connected to the sprinkler inside the second cooling water utilization device 10, which may cause excessive water volume inside the second cooling water utilization device 10. By providing a flow rate regulating valve in the sprinkler, the water spraying speed can be better controlled to ensure the necessary water consumption for spraying water while preventing excessive spraying from wasting cooling water.

[0051] The following is a further detailed description of the use of the above cooling return water recycling device in a scenario where the unit uses desalted water for cooling.

[0052] Figure 1 The middle cooling water pipe 7 is the desalted water pipe in this scene; the first cooling water utilization device 8 is the water supply pump shaft end cooling system in this scene; the water storage device 9 is the low-level water tank in this scene; the second cooling water utilization device 10 is the hydrophobic expansion tank in this scene; the buffer water tank 11 is the buffer water tank in this scene.

[0053] The desalted water pipeline is provided by chemical water production and is used for deaerator water replenishment. The normal pressure is 1.0MPa, and the temperature is generally 10℃-20℃ in winter and 20℃-30℃ in summer. Part of it is led out by branch pipes and used for cooling the shaft end of the electric feed water pump and spray cooling water for the exhaust steam of the steam turbine body drain expansion tank.

[0054] The feed water pump is used to deliver the water in the deaerator to the boiler. The fourth valve 4 and the fifth valve 5 are cooling water inlet and outlet valves at the shaft ends of the feed water pump.

[0055] The drain expansion tank is used to cool the high-temperature drain and reduce the steam pressure in the drain. The drain expansion tank contains a spray water inlet valve.

[0056] The low-level water tank is used to store drain condensate and cooling water from the shaft end of the feed pump, which is then pumped to the deaerator through a low-level water pump to recover the working fluid.

[0057] The buffer water tank 11 is used for temporarily storing the drainage of the hydrophobic expansion tank when the water level of the low-level water tank is too high. Both the low-level water tank and the buffer water tank 11 are provided with water level gauges.

[0058] During the start-up and shutdown process of the unit, due to the long drain time and high temperature of the system, the drain expansion tank needs a large amount of cooling water to spray and cool down, and the cooling water of the feed pump is put into use at the same time, which makes the water level of the low-level water tank difficult to adjust and control. If there is no spraying or less spraying, the water in the U-shaped water seal at the bottom of the drain expansion tank evaporates, and the high-temperature drain and exhaust steam enter the low-level water tank, causing over-temperature cavitation of the water tank and water pump, endangering the safe operation of the low-level water pump.

[0059] In addition, after passing through the cooling system of the water pump shaft end, the desalted water directly enters the low-level water tank and is then sent to the deaerator. Since the bearing temperature of the water pump is not high, the temperature rise of these cooling waters is relatively low and they can be reused in the hydrophobic expansion tank as spray water.

[0060] This system connects the cooling water at the shaft end of the feed pump to the sprayer of the drain expansion tank (dashed line part) through a tee. When the unit needs to drain during startup and shutdown, the third valve 3 is opened, and the first valve 1 and the second valve 2 are closed, so that the cooling return water at the shaft end of the feed pump enters the drain expansion tank to cool down and reduce the pressure of the high-temperature and high-pressure drain.

[0061] The above improvements can effectively solve the problems of high drain temperature and wasteful exhaust steam discharge during the start-up and shutdown process of the unit, reduce the water consumption of desalted water, control the liquid level of the low-level water tank, and heat the working fluid sent to the deaerator at the same time, effectively improve the efficiency of the deaerator, thereby achieving energy conservation and emission reduction, protecting the environment, reducing noise, and ensuring the occupational health of employees.

[0062] It is understandable that there are situations in the factory where the water pump stops working for a long time and cooling water is no longer needed. Therefore, a fourth valve 4 is installed on the pipe between the desalted water pipe and the cooling water system at the shaft end of the water pump to facilitate and quickly open or cut off the water source.

[0063] In addition, a fifth valve 5 is installed upstream of the first valve 1 and the third valve 3. When there is a safety hazard in the water pump shaft end cooling system, which causes the cooling water to be contaminated and cannot be reused or discharged into the low-level water tank, the drainage of the water pump shaft end cooling system can be conveniently cut off.

[0064] Because the hydrophobic expansion tank has temperature requirements for the spray cooling water, a temperature detection device is set in the hydrophobic expansion tank. When the spray water temperature in the hydrophobic expansion tank is too high, it may be that the cooling water temperature at the shaft end of the water feed pump is too high. In this case, the third valve 3 is closed and the first valve 1 is opened to directly discharge the cooling water at the shaft end of the water feed pump to the low-level water tank; or the second valve 2 is opened at the same time to introduce cooling water in the desalted water pipeline to adjust the water temperature.

[0065] A spray flow rate regulating valve is provided in the sprayer of the hydrophobic expansion tank, which is convenient for adjusting the cooling water in the hydrophobic expansion tank, thereby saving water and ensuring sufficient contact and cooling of the cooling water and gas.

[0066] It should also be noted that in this system, the first cooling water utilization device 8 is not limited to the water supply pump shaft end cooling system, and the second cooling water utilization device 10 is not limited to the hydrophobic expansion tank. It is only necessary that the drainage of one module meets the use standard of the other module, and both modules have cooling water utilization requirements. There can be multiple first cooling water utilization devices 8 and second cooling water utilization devices 10. For example, the drainage of multiple first cooling water utilization devices 8 can be used in one or more second cooling water utilization devices 10.

[0067] The embodiments described above are merely preferred embodiments of this specification and are not intended to limit the scope of this specification. Without departing from the design spirit of this specification, various modifications and improvements made to the technical solutions of this specification by ordinary technicians in this field should fall within the scope of protection determined by the claims of this specification.

Claims

1. A cooling water recycling system, characterized in that: It includes a cooling water pipeline, a first cooling water utilization device, a second cooling water utilization device, and a water storage device; The cooling water pipeline, the first cooling water utilization device, and the water storage device are connected in sequence, and a first valve is provided on the pipeline connecting the first cooling water utilization device and the water storage device; The cooling water pipeline, the second cooling water utilization device, and the water storage device are connected in sequence; a second valve is provided on the pipeline connecting the cooling water pipeline and the second cooling water utilization device; The first cooling water utilization device is also connected to the second cooling water utilization device, and a third valve is provided on the pipeline connecting the first cooling water utilization device and the second cooling water utilization device.

2. The cooling water recycling system according to claim 1, characterized in that: A fourth valve is provided on the pipeline connecting the cooling water pipeline and the first cooling water utilization device.

3. The cooling water recycling system according to claim 1, characterized in that: The pipeline connecting the first cooling water utilization device and the second cooling water utilization device is a branch pipeline of the pipeline connecting the first cooling water utilization device and the water storage device, and the branch point of the branch pipeline is located at the upstream end of the first valve.

4. The cooling water recycling system according to claim 3, characterized in that: A fifth valve is also provided on the pipeline connecting the first cooling water utilization device and the water storage device, and the branch point of the branch pipeline is located at the downstream end of the fifth valve.

5. The cooling water recycling system according to claim 4, characterized in that: The branch pipe is connected to the pipe connecting the cooling water pipe and the second cooling water utilization device, and the connection point between the branch pipe and the pipe connecting the cooling water pipe and the second cooling water utilization device is located at the downstream end of the second valve.

6. The cooling water recycling system according to claim 1, characterized in that: The second cooling water utilization device is provided with a thermometer.

7. The cooling water recycling system according to claim 6, characterized in that: The water storage device is provided with a first water level gauge.

8. The cooling water recycling system according to claim 1, characterized in that: The second cooling water utilization device is connected to the water storage device through a buffer water tank.

9. The cooling water recycling system according to claim 8, characterized in that: A sixth valve is provided on the connecting pipe between the buffer water tank and the water storage recovery device, and a second water level gauge is provided in the buffer water tank.

10. The cooling return water recycling system according to claim 1, characterized in that: A sprinkler is provided on the top of the second cooling water utilization device, the cooling water pipeline and the first cooling water utilization device are connected to the sprinkler inside the second cooling water utilization device, and a sprinkler flow rate regulating valve is provided inside the sprinkler.

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