CN116538759A - Closed water system and control method thereof - Google Patents

Abstract

The present disclosure relates to a closed water system and a control method thereof, wherein the closed water system is used for providing a cooling liquid for a first unit device and a second unit device, and the closed water system comprises: the first liquid supply loop comprises first water pipes connected to two ends of the first unit equipment; and the second liquid supply loop comprises a second water pipe connected to two ends of the second unit equipment, wherein a first connecting pipe and a second connecting pipe capable of circulating cooling liquid are connected between the first water pipe and the second water pipe, a first stop valve is arranged on the first connecting pipe, a second stop valve is arranged on the second connecting pipe, and the closed water system further comprises a control device, wherein the control device is electrically connected with the first stop valve and the second stop valve and used for controlling the opening and closing of the first stop valve and the second stop valve. When one of the first liquid supply loop and the second liquid supply loop fails, the other liquid supply loop can be utilized to simultaneously provide cooling liquid for the two unit set devices, so that the safe operation of the unit set devices is ensured.

Description

Closed water system and control method thereof

Technical Field

The disclosure relates to the technical field of closed water systems of thermal power plants, in particular to a closed water system and a control method thereof.

Background

The closed water system is a cooling system and has the function of providing a cooling water source for auxiliary equipment of the unit so as to ensure the normal operation of the auxiliary equipment and the system.

In the related art, a closed water system of a thermal power plant generally adopts a unit system unit to supply cooling liquid to each device of the unit system unit, for the unit system unit, the closed water system is independently operated, whether the closed water system is normal or not is related to the safety of the unit system unit device and whether the closed water system can transmit electric energy, which is an important condition for ensuring the safe operation of a main machine and an auxiliary machine of a thermal power plant, and once the closed water pump fails to cause the interruption of the supply of closed water (namely cooling liquid), the cooling liquid of the unit system unit device is possibly lost to damage the unit system unit device.

Disclosure of Invention

It is a first object of the present disclosure to provide a closed water system that at least partially solves the technical problems existing in the related art.

A second object of the present disclosure is to provide a control method for controlling a closed water system provided by the present disclosure.

In order to achieve the above object, the present disclosure provides a closed water system for providing a cooling liquid to a first unit equipment and a second unit equipment, the closed water system comprising:

the first liquid supply loop comprises first water pipes connected to two ends of the first unit equipment; and

a second liquid supply loop comprises a second water pipe connected with two ends of the second unit equipment,

wherein a first connecting pipe and a second connecting pipe capable of circulating cooling liquid are connected between the first water pipe and the second water pipe, a first stop valve is arranged on the first connecting pipe, a second stop valve is arranged on the second connecting pipe,

the closed water system further comprises a control device, wherein the control device is electrically connected with the first stop valve and the second stop valve and used for controlling the opening and closing of the first stop valve and the second stop valve.

Optionally, the first liquid supply loop comprises a first water tank connected with the first water pipe and a first water pump arranged on the first water pipe, and the first water pump is electrically connected with the control device.

Optionally, the connection positions of the first connection pipe and the second connection pipe with the first water pipe are located at two sides of the first water pump.

Optionally, a first control valve is disposed on the first water pipe, and the first control valve is electrically connected to the control device.

Optionally, the closed water system further comprises a first pressure detection device, wherein the first pressure detection device is arranged on the first water pipe and is close to the pumping outlet of the first water pump, and the first pressure detection device is respectively and electrically connected with the control device and the first control valve.

Optionally, the second liquid supply loop comprises a second water tank connected with the second water pipe and a second water pump arranged on the second water pipe, and the second water pump is electrically connected with the control device.

Optionally, the connection positions of the first connection pipe and the second water pipe are located at two sides of the second water pump.

Optionally, a second control valve is arranged on the second water pipe, and the second control valve is electrically connected to the control device.

Optionally, the closed water system further comprises a second pressure detection device, the second pressure detection device is arranged on the second water pipe and is close to the pumping outlet of the second water pump, and the second pressure detection device is electrically connected with the control device and the second control valve respectively.

A second object of the present disclosure is to provide a control method of a closed water system for controlling the closed water system according to the above, wherein the method comprises:

and controlling the first stop valve and the second stop valve to be opened when one of the first liquid supply circuit and the second liquid supply circuit is abnormal.

Through above-mentioned technical scheme, when the closed water system that this disclosure provided normally operates, first stop valve and second stop valve are closed, and first liquid supply circuit provides the coolant liquid to first unit equipment, and the second liquid supply circuit provides the coolant liquid to the second unit. When one of the first liquid supply loop or the second liquid supply loop breaks down to cause the interruption of the cooling liquid supply, the opening of the first stop valve and the second stop valve can be controlled by the control device so as to lead the cooling liquid of the other one of the first liquid supply loop or the second liquid supply loop to the first unit equipment and the second unit equipment by means of the first connecting pipe and the second connecting pipe, thereby ensuring that the first unit equipment and the second unit equipment can always and normally operate stably.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic illustration of a closed water system provided in an exemplary embodiment of the present disclosure;

fig. 2 is a flowchart of a control method provided by an exemplary embodiment of the present disclosure.

Description of the reference numerals

10-a first unit equipment; 11-a first end; 12-a second end; 20-a second unit equipment; 21-a third end; 22-fourth ends; 30-a first liquid supply circuit; 31-a first water pipe; 32-a first water tank; 33-a first water pump; 34-a first control valve; 40-a second liquid supply circuit; 41-a second water pipe; 42-a second water tank; 43-a second water pump; 44-a second control valve; 51-a first connection tube; 52-a second connecting tube; 53-a first shut-off valve; 54-second shut-off valve.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In this disclosure, unless otherwise indicated, terms of orientation such as "inner" and "outer" are used with respect to the outline of the corresponding component itself. The terms such as "first," "second," and the like, as used in this disclosure, are used for distinguishing one element from another and not necessarily for order or importance. Furthermore, the following description, when taken in conjunction with the accompanying drawings, like reference numerals designate the same or similar elements in different drawings.

Referring to fig. 1, the present disclosure provides a closed water system that may be used to provide cooling fluid to a first unit equipment 10 and a second unit equipment 20. In the embodiments provided by the present disclosure, the first and second unit pieces 10, 20 may be coolers in a closed water system. Specifically, the closed water system may include a first liquid supply circuit 30 and a second liquid supply circuit 40. Wherein, the first liquid supply circuit 30 may include a first water pipe 31 connected to both ends of the first unit equipment 10, that is, both ends of the first water pipe 31 may be connected to the first end 11 and the second end 12 of the first unit equipment 10, respectively, and the first end 11 and the second end 12 may be formed as a water inlet and a water outlet of the first unit equipment 10, respectively. The second liquid supply circuit 40 may include a second water pipe 41 connected to both ends of the second unit equipment 20, that is, both ends of the second water pipe 41 may be connected to the third end 21 and the fourth end 22 of the second unit equipment 20, respectively, and the third end 21 and the fourth end 22 may be formed as a water inlet and a water outlet of the second unit equipment 20, respectively. In the present disclosure, a first connection pipe 51 and a second connection pipe 52 capable of circulating a cooling liquid may be connected between the first water pipe 31 and the second water pipe 41, a first shut-off valve 53 may be provided on the first connection pipe 51 to control on-off of the first connection pipe 51, and a second shut-off valve 54 may be provided on the second connection pipe 52 to control on-off of the second connection pipe 52. The closed water system may further comprise a control device, which may be electrically connected to the first shut-off valve 53 and the second shut-off valve 54 for controlling the opening and closing of the first shut-off valve 53 and the second shut-off valve 54. In the embodiments provided by the present disclosure, the first shut-off valve 53 and the second shut-off valve 54 may be configured as electric valves or pneumatic valves.

Through the above technical solution, when the closed water system provided by the present disclosure is operating normally, the first stop valve 53 and the second stop valve 54 are closed, the first liquid supply circuit 30 provides the cooling liquid to the first unit equipment 10, and the second liquid supply circuit 40 provides the cooling liquid to the second unit 20. When one of the first liquid supply loop 30 or the second liquid supply loop 40 fails to cause interruption of the supply of the cooling liquid, the opening of the first stop valve 53 and the second stop valve 54 may be controlled by the control device to introduce the cooling liquid of the other one of the first liquid supply loop 30 or the second liquid supply loop 40 into the first unit equipment 10 and the second unit equipment 20 by means of the first connection pipe 51 and the second connection pipe 52, thereby ensuring that the first unit equipment 10 and the second unit equipment 20 can always operate normally and stably.

Referring to fig. 1, the first liquid supply circuit 30 may include a first water tank 32 and a first water pump 33. The first water tank 32 may be connected to the first water pipe 31 for introducing a cooling liquid into the first water pipe 31, the first water pump 33 may be disposed on the first water pipe 31, and the first water pump 33 may be electrically connected to the control device to control the start and stop of the first water pump 33 by the control device. The first water tank 32 may be configured as a closed water tank, the first water pump 33 may be configured as a closed water pump, the cooling liquid may be condensed water when the first water tank 32 is a desalination water tank, and the first water pump 33 may be configured as a condensed water delivery pump. In the present disclosure, when the first liquid supply circuit 30 is operating normally, the first water pump 33 may deliver water in the first water tank 32 to the first end 11 through the first water pipe 31, then, the cooling liquid is introduced into the first unit equipment 10, and then, the cooling liquid is discharged into the first water tank 32 through the first water pipe 31 through the second end 12. When the first liquid supply circuit 30 (for example, the first water pump 33) fails, the control device controls the first stop valve 53 and the second stop valve 54 to open, and controls the cooling liquid of the second liquid supply circuit 40 to be delivered to the first end 11 through the second connection pipe 52 so as to be introduced into the first unit equipment 10, and then the cooling liquid is discharged to the first water pipe 31 through the second end 12 and flows back to the second liquid supply circuit 40 through the first connection pipe 52, wherein, when the second liquid supply circuit 40 supplies the cooling liquid to the first unit equipment 10, the second liquid supply circuit 40 is not interrupted to supply the cooling liquid to the second unit equipment 20.

Referring to fig. 1, the connection of the first connection pipe 51 and the second connection pipe 52 with the first water pipe 31 may be located at both sides of the first water pump 33. That is, one end of the second connection pipe 52 may be connected to a pumping outlet side of the first water pump 33 mentioned below, and one end of the first connection pipe 51 may be connected to a pumping inlet side of the first water pump 33, thereby extending a distance between the first connection pipe 51 and the second connection pipe 52, so that the cooling liquids respectively flowing through the first connection pipe 51 and the second connection pipe 52 do not interfere with each other, thereby ensuring smooth water flow.

Referring to fig. 1, a first control valve 34 may be provided on the first water pipe 31, and the first control valve 34 may be electrically connected to the control device. In the embodiments provided by the present disclosure, the first control valve 34 may be configured as an electrically or pneumatically operated valve. When the first liquid supply circuit 30 works normally, the control device can control the first control valve 34 to be opened, and at this time, the first control valve 34 can be used as a check valve to prevent the cooling liquid flowing through the first water pump 33 from flowing backwards, so as to influence the stability of the cooling liquid flowing process. When the first liquid supply circuit 30 (for example, the first water pump 33) fails, the control device may control the first control valve 34 to be closed, and at this time, the first control valve 34 may be used as a shut-off valve to prevent the coolant led to the first unit equipment 10 from flowing through the first water pump 33.

In the embodiment provided by the present disclosure, the closed water system may further include a first pressure detecting device, which may be disposed on the first water pipe 31 near the pumping outlet of the first water pump 33, and which may be electrically connected with the control device and the first control valve 34, respectively, and which may be used to detect the pressure at the pumping outlet of the first water pump 33 and transmit a pressure signal to the control device. For example, when the pressure at the pumping outlet of the first water pump 33 is abnormal, for example, lower than a preset value, the first pressure detecting device may transmit a pressure signal to the control device, and after receiving the pressure signal, the control device closes the first control valve 34, blocks the first liquid supply circuit 30 from introducing the cooling liquid into the first unit equipment 10, and then controls the first stop valve 53 and the second stop valve 54 to open, so as to introduce a part of the cooling liquid in the second liquid supply circuit 40 into the first unit equipment 10.

Referring to fig. 1, the second liquid supply circuit 40 may include a second water tank 42 and a second water pump 43. The second water tank 42 may be connected to the second water pipe 41 to introduce the cooling liquid into the second water pipe 41, the second water pump 43 may be disposed on the second water pipe 41, and the second water pump 43 may be electrically connected to the control device to control the start and stop of the second water pump 43 through the control device. The second water tank 42 may be configured as a closed water tank, the second water pump 43 may be configured as a closed water pump, the cooling liquid may be condensed water when the second water tank 42 is a desalination water tank, and the second water pump 43 may be configured as a condensed water delivery pump. In the present disclosure, when both the first and second liquid supply circuits 30 and 40 are operating normally, the first and second shut-off valves 53 and 54 are closed, respectively, and when the first liquid supply circuit 30 has the first water tank 32, the first water tank 32 may supply the cooling liquid to the first unit equipment 10, and the second water tank 42 may supply the cooling liquid to the second unit equipment 20. Specifically, when the second liquid supply circuit 40 is operating normally, the second water pump 43 may convey water in the second water tank 42 to the third end 21 through the second water pipe 41, then, the cooling liquid is introduced into the second unit equipment 20, and then, the cooling liquid is discharged to the second water tank 42 through the second water pipe 41 via the fourth end 22. In case of a malfunction of the second liquid supply circuit 40 (e.g. the second water pump 43), the control device may control the first shut-off valve 53 and the second shut-off valve 54 to be opened, and the first liquid supply circuit 30, i.e. the cooling liquid in the first water tank 32, may be fed to the third end 21 via the second connection pipe 52 to feed the cooling liquid into the second unit equipment 20, and then the cooling liquid is discharged to the second water tank 42 via the fourth end 22 and flows back to the first liquid supply circuit 30 via the first connection pipe 51 and into the first water tank 32, it should be noted that the first liquid supply circuit 30 does not interrupt the supply of the cooling liquid to the first unit equipment 10 when the first liquid supply circuit 30 supplies the cooling liquid to the second unit equipment 20.

Referring to fig. 1, the connection positions of the first and second connection pipes 51 and 52 and the second water pipe 41 are located at both sides of the second water pump 43. One end of the second connection pipe 52 may be connected to one side of a pumping outlet of the second water pump 43 described below, and one end of the first connection pipe 51 may be connected to one side of a pumping inlet of the second water pump 43, thereby extending a distance between the first connection pipe 51 and the second connection pipe 52, so that the cooling liquids flowing through the first connection pipe 51 and the second connection pipe 52, respectively, do not interfere with each other, thereby ensuring smooth water flow. When the first liquid supply circuit 30 has the first water pump 33, the other end of the second connection pipe 52 may be connected to the pumping outlet side of the first water pump 33, and the other end of the first connection pipe 51 may be disposed to the pumping inlet side of the first water pump 33 to further ensure the smoothness of the water flow.

Referring to fig. 1, a second control valve 44 may be provided on the second water pipe 41, and the second control valve 44 may be electrically connected to the control device. In the embodiments provided by the present disclosure, the second control valve 44 may be configured as a pneumatic valve or an electric valve. When the second liquid supply circuit 40 works normally, the control device can control the second control valve 44 to be opened, and at this time, the second control valve 44 can be used as a check valve to prevent the coolant flowing through the second water pump 43 from flowing backwards, so as to influence the stability of the coolant flowing process. When the second liquid supply circuit 40 (e.g., the second water pump 43) fails, the control device may control the second control valve 44 to close, and at this time, the second control valve 44 may function as a shut-off valve, preventing the coolant to the second unit equipment 20 from flowing through the second water pump 43.

In the embodiment provided by the present disclosure, the closed water system may further include a second pressure detection device disposed on the second water pipe 41 near the pumping outlet of the second water pump 43, and electrically connected to the control device and the second control valve 44, respectively. The second pressure detecting means may be provided on the second water pipe 41 near the pumping outlet of the second water pump 43, and the second pressure detecting means may be electrically connected with the control means and the second control valve 44, respectively, and the second pressure detecting means may be used to detect the pressure at the pumping outlet of the second water pump 43 and transmit a pressure signal to the control means. For example, when the pressure at the pumping outlet of the second water pump 43 is abnormal, for example, lower than a preset value, the second pressure detecting device may transmit a pressure signal to the control device, and after receiving the pressure signal, the control device closes the second control valve 44, blocks the second liquid supply circuit 40 from supplying the cooling liquid to the second unit equipment 20, and then controls the first stop valve 53 and the second stop valve 54 to open, so as to supply part of the cooling liquid in the first liquid supply circuit 30 to the second unit equipment 20.

According to a second aspect of the present disclosure, there is also provided a control method of a closed water system, which can be used to control the closed water system described above, wherein the method includes controlling the first stop valve 53 and the second stop valve 54 to open when one of the first liquid supply circuit 30 and the second liquid supply circuit 40 is abnormal, for example, when the flow rate of the cooling liquid in the first liquid supply circuit 30 and the second liquid supply circuit 40 becomes low, the circulation of the cooling liquid is poor, or the liquid supply apparatus is abnormal. The control method has all the beneficial effects of the closed water system provided by the present disclosure, and is not described herein.

The control method of the closed water system provided by the present disclosure is further described below with reference to fig. 1 and 2:

when the first liquid supply circuit 30 and the second liquid supply circuit 40 are both operating normally, the control device controls the first stop valve 53 and the second stop valve 54 to be closed, and the first control valve 34 and the second control valve 44 to be opened. In the first liquid supply circuit 30, the first water tank 32 supplies the first unit equipment 10 with the cooling liquid through the first water pipe 31, specifically, the cooling liquid sequentially flows through the first water tank 32, the pumping inlet of the first water pump 33, the pumping outlet of the first water pump 33, the first pressure detection device and the first control valve 34, then is introduced into the first unit equipment 10 through the first end 11, and then flows back to the first water tank 32 through the second end 12, so that the circulation of the cooling liquid in the first water tank 32 in the first liquid supply circuit 30 is completed; in the second liquid supply circuit 40, the second water tank 42 supplies the cooling liquid to the second unit equipment 20 through the second water pipe 41, specifically, the cooling liquid flows through the second water tank 42, the pumping inlet of the second water pump 43, the pumping outlet of the second water pump 43, the second pressure detection device and the second control valve 44 in sequence, then is introduced into the second unit equipment 20 through the third end 21, and then flows back to the second water tank 42 through the fourth end 22; this completes the circulation of the coolant in the second tank 42 in the second supply circuit 30 once.

When the first liquid supply circuit 30 fails, and the second liquid supply circuit 40 operates normally: the control device controls the first stop valve 53, the second stop valve 54 and the second control valve 44 to be opened, and the first control valve 34 to be closed; after flowing through the second water pipe 41, the cooling liquid in the second water tank 42 sequentially passes through the second water pump 43 and the second control valve 44, part of the cooling liquid flows to the second water pipe 41, flows into the second unit equipment 20 through the third end 21, flows back to the second water tank 42 through the fourth end 22, flows to the second connecting pipe 52, flows into the first unit equipment 10 through the second stop valve 54 and the first end 11, flows through the first stop valve 53 sequentially through the first water pipe 31 and the first connecting pipe 51, flows back to the second water tank 42 through the second water pipe 41, and finally flows back to the second water tank 42 after flowing into the first unit equipment 10 and the second unit equipment 20 respectively, so that the circulation of the cooling liquid in the second water tank 42 is completed.

When the second liquid supply circuit 40 fails, and the first liquid supply circuit 30 operates normally: the control device controls the first stop valve 53, the second stop valve 54 and the first control valve 34 to be opened, and the second control valve 44 to be closed; after flowing through the first water pipe 31, the cooling liquid in the first water tank 32 sequentially passes through the first water pump 33 and the first control valve 34, part of the cooling liquid flows to the first water pipe 31, flows into the first unit equipment 10 through the first end 11, flows back to the first water tank 32 through the second end 12, flows to the second connecting pipe 52, flows into the second unit equipment 20 through the second stop valve 54, the second water pipe 41 and the third end 21, flows through the first stop valve 53 sequentially through the second water pipe 41 and the first connecting pipe 51, flows back to the first water tank 32 through the first water pipe 31, and finally flows back to the first water tank 32 after flowing into the first unit equipment 10 and the second unit equipment 20 respectively, so that the circulation of the cooling liquid in the first water tank 32 is completed.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A closed water system for providing a cooling fluid to a first unit plant and a second unit plant, the closed water system comprising:

the first liquid supply loop comprises first water pipes connected to two ends of the first unit equipment; and

a second liquid supply loop comprises a second water pipe connected with two ends of the second unit equipment,

wherein a first connecting pipe and a second connecting pipe capable of circulating cooling liquid are connected between the first water pipe and the second water pipe, a first stop valve is arranged on the first connecting pipe, a second stop valve is arranged on the second connecting pipe,

the closed water system further comprises a control device, wherein the control device is electrically connected with the first stop valve and the second stop valve and used for controlling the opening and closing of the first stop valve and the second stop valve.

2. The closed water system according to claim 1, wherein the first liquid supply circuit comprises a first water tank connected to the first water pipe, and a first water pump disposed on the first water pipe, the first water pump being electrically connected to the control device.

3. The closed water system according to claim 2, wherein the connection positions of the first connection pipe and the second connection pipe with the first water pipe are located at both sides of the first water pump.

4. A closed water system according to claim 3, wherein a first control valve is provided on the first water pipe, the first control valve being electrically connected to the control device.

5. The closed water system according to claim 4, further comprising a first pressure detection device disposed on the first water pipe proximate to the pumping outlet of the first water pump, the first pressure detection device being electrically connected to the control device and the first control valve, respectively.

6. The closed water system according to any one of claims 1-5, wherein the second liquid supply circuit comprises a second water tank connected to the second water pipe, and a second water pump disposed on the second water pipe, the second water pump being electrically connected to the control device.

7. The closed water system according to claim 6, wherein the connection locations of the first connection pipe and the second connection pipe with the second water pipe are located at both sides of the second water pump.

8. The closed water system according to claim 7, wherein a second control valve is provided on the second water pipe, the second control valve being electrically connected to the control device.

9. The closed water system according to claim 8, further comprising a second pressure detection device disposed on the second water pipe proximate to the pumping outlet of the second water pump, the second pressure detection device being electrically connected to the control device and the second control valve, respectively.

10. A control method of a closed water system, characterized in that the control method is for controlling a closed water system according to any one of claims 1-9, wherein the method comprises:

and controlling the first stop valve and the second stop valve to be opened when one of the first liquid supply circuit and the second liquid supply circuit is abnormal.