Power generation auxiliary machine cooling system with isolated water outlet sides of large water pump and small water pump and control method thereof

Abstract

The invention belongs to the technical field of power generation auxiliary machine cooling systems, and provides a power generation auxiliary machine cooling system with isolated water outlet sides of a large water pump and a small water pump and a control method thereof. Comprising a first water pump subsystem, a second water pump subsystem, a cooling tower subsystem, a light condensation and heat collection system auxiliary machine cooling water subsystem, a heat exchange system auxiliary machine cooling water subsystem and a steam turbine power generation system auxiliary machine cooling water subsystem. By controlling opening and closing of the first shut-off valve, the second shut-off valve, the cooling tower bypass valve, the cooling tower water inlet valve and the cooling tower water outlet valve, alternate operation of the first water pump subsystem and the second water pump subsystem is achieved, and the requirements of operation modes of the photo-thermal power station in different time periods for the auxiliary machine cooling system can be met; and the energy of the closed water pump running in different running modes is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power generation auxiliary machine cooling system, and in particular relates to a power generation auxiliary machine cooling system with isolated water outlet sides of large and small water pumps and a control method thereof. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The conventional power generation auxiliary machine cooling system includes a set of closed water pumps, or a closed water booster pump is additionally provided due to insufficient lift of some pipelines, wherein the closed water pump and the closed water booster pump are connected in series.

[0004] However, a new problem encountered by CSP power stations is that the concentrated solar collector system generally operates during the day when the sunshine conditions are good, while the heat exchange system and steam turbine power generation system generally operate regardless of the sunshine conditions, and even mostly operate at night or during periods of poor sunshine conditions. The auxiliary equipment of the concentrated solar collector system requires less cooling water, while the auxiliary equipment of the heat exchange system and steam turbine power generation system requires more cooling water, and the cooling water volume of the two is not on the same order of magnitude, that is, the difference is about 10 times or more.

[0005] The traditional auxiliary cooling system for power generation uses a set of closed water pumps to supply cooling water for all auxiliary machines. When the auxiliary machines in the power station system are operated in different time periods, the closed water pumps only reflect the difference in load. If the above auxiliary cooling water system is applied to the CSP power station, when the power grid does not require the CSP power station to generate electricity (i.e., the power generation is 0) and the sunshine conditions are good during the day, there is a condition where only the concentrated solar collector system is running, while the heat exchange system and the steam turbine power generation system are not running. Under this condition, it is very easy to cause a large pump to drive cooling water with a small flow demand, and the normal operation of the large pump has a minimum flow requirement, so it is often necessary to open the minimum flow recirculation bypass of the large pump, resulting in a waste of closed water pump operation energy. Summary of the invention

[0006] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps and a control method thereof. By setting two water pump subsystems with different flow rates and isolating the outlet sides of the two water pump subsystems through multiple valves, the requirements of the auxiliary machine cooling system for the operation mode of the solar thermal power station in different time periods can be met through the control of the valves, thereby saving the energy of the closed water pump operating in different operation modes.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A first aspect of the present invention provides a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps.

[0009] The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps includes the first water pump subsystem, the second water pump subsystem, the auxiliary machine cooling water subsystem of the concentrated solar collector system, the auxiliary machine cooling water subsystem of the heat exchange system and the auxiliary machine cooling water subsystem of the steam turbine power generation system;

[0010] Wherein, the flow rate of the first water pump subsystem is less than the flow rate of the second water pump subsystem;

[0011] The water inlet and outlet sides of the auxiliary cooling water subsystem of the concentrated solar collector system, the auxiliary cooling water subsystem of the heat exchange system and the auxiliary cooling water subsystem of the steam turbine power generation system are respectively connected to the auxiliary cooling water inlet main pipe and the auxiliary cooling water outlet main pipe, and a second shut-off valve is provided on the connecting pipe between the outlet side of the auxiliary cooling water subsystem of the concentrated solar collector system and the auxiliary cooling water outlet main pipe;

[0012] The water outlet sides of the first water pump subsystem and the second water pump subsystem are both connected to the second water pump outlet main pipe, and a first shut-off valve is provided on the connecting pipeline between the first water pump subsystem and the second water pump outlet main pipe;

[0013] A cooling tower subsystem is arranged between the second water pump outlet main pipe and the auxiliary machine cooling water inlet main pipe, and the cooling tower subsystem includes a cooling tower bypass branch pipe and a cooling tower inlet and outlet water pipe in parallel; a cooling tower bypass valve and a cooling tower are respectively arranged on the cooling tower bypass branch pipe and the cooling tower inlet and outlet water pipes, and a cooling tower inlet valve and a cooling tower outlet valve are respectively arranged on the cooling tower inlet side and the cooling tower outlet side;

[0014] The alternating operation of the first water pump subsystem and the second water pump subsystem is achieved by controlling the opening and closing of the first shut-off valve, the second shut-off valve, the cooling tower bypass valve, the cooling tower water inlet valve and the cooling tower water outlet valve.

[0015] Further, the second water pump subsystem includes a second water pump branch pipe and a second water pump outlet recirculation branch pipe;

[0016] The water inlets of the second water pump branch pipe and the second water pump outlet recirculation branch pipe are both connected to the auxiliary machine cooling water outlet main pipe, and the water outlets of the second water pump branch pipe and the second water pump outlet recirculation branch pipe are both connected to the second water pump outlet main pipe;

[0017] The second water pump branch pipe is provided with a second water pump.

[0018] Furthermore, the second water pump branch pipe is provided with a second water pump water inlet side shut-off valve, a second water pump, a second water pump water outlet side check valve and a second water pump water outlet side shut-off valve;

[0019] The second water pump outlet recirculation branch pipe is provided with a second water pump outlet recirculation branch pipe valve.

[0020] Furthermore, it also includes a closed water tank constant pressure subsystem, which includes a closed expansion water tank and a constant pressure pipe before the second water pump; the auxiliary machine cooling water outlet main pipe is connected to the closed expansion water tank, and the connecting pipe between the auxiliary machine cooling water outlet main pipe and the closed expansion water tank is called the constant pressure pipe before the second water pump, and a second water pump constant pressure pipe shut-off valve is arranged on the second water pump constant pressure pipe.

[0021] As an embodiment, the first water pump subsystem is arranged on the connecting pipeline between the water inlet side of the auxiliary cooling water subsystem of the concentrating solar collector system and the auxiliary cooling water inlet main pipe, the auxiliary cooling water subsystem of the concentrating solar collector system is arranged on the connecting pipeline between the water outlet side of the first water pump subsystem and the second water pump outlet main pipe, and the first shut-off valve is arranged between the water outlet side of the auxiliary cooling water subsystem of the concentrating solar collector system and the second water pump outlet main pipe.

[0022] As an implementation manner, the water outlet side of the auxiliary cooling water subsystem of the concentrated solar collector system is connected to the water inlet side of the first water pump subsystem, and the water inlet side of the first water pump subsystem is also connected to a closed expansion water tank.

[0023] As an implementation mode, the water inlet side of the auxiliary cooling water subsystem of the concentrated solar collector system is connected to the water outlet side of the first water pump subsystem, and the water inlet branch of the auxiliary cooling water subsystem of the concentrated solar collector system is arranged in parallel with the first water pump branch.

[0024] As an implementation mode, the water inlet side of the auxiliary cooling water subsystem of the concentrated solar collector system is connected to the water outlet side of the first water pump subsystem, and the water inlet branch of the auxiliary cooling water subsystem of the concentrated solar collector system is arranged in parallel with the first water pump branch and the first water pump outlet recycling branch.

[0025] Furthermore, the first water pump subsystem includes a first water pump branch pipe and a first water pump outlet recirculation branch pipe; the first water pump branch pipe and the first water pump outlet recirculation branch pipe are arranged in parallel; the first water pump branch pipe is provided with a first water pump;

[0026] Furthermore, the first water pump branch pipe is sequentially provided with a first water pump inlet side shut-off valve, a first water pump, a first water pump outlet side check valve and a first water pump outlet side shut-off valve.

[0027] The first water pump outlet recirculation branch pipe is provided with a first water pump outlet recirculation branch pipe valve.

[0028] Furthermore, the cooling water subsystem of the auxiliary equipment of the concentrated solar collector system includes a plurality of parallel concentrated solar collector system auxiliary equipment, and a manual valve is provided on the water inlet side and the water outlet side of each concentrated solar collector system auxiliary equipment.

[0029] Furthermore, the heat exchange system auxiliary machine cooling water subsystem includes a plurality of parallel heat exchange system auxiliary machines, and a manual valve is provided on the water inlet side and the water outlet side of each heat exchange system auxiliary machine.

[0030] Furthermore, the auxiliary machine cooling water subsystem of the steam turbine generator system includes a plurality of parallel auxiliary machines of the steam turbine generator system, and a manual valve is provided on the water inlet side and the water outlet side of each auxiliary machine of the steam turbine generator system.

[0031] A second aspect of the present invention provides a control method for a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in the first aspect.

[0032] The control method of the power generation auxiliary machine cooling system with the outlet sides of the large and small water pumps isolated as described in the first aspect comprises:

[0033] The opening and closing of the first shut-off valve, the second shut-off valve, the cooling tower bypass valve, the cooling tower water inlet valve and the cooling tower water outlet valve are controlled to realize the alternating operation of the first water pump subsystem and the second water pump subsystem.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] The present invention provides two water pump subsystems with different flow rates, and isolates the water outlet sides of the two water pump subsystems through multiple valves. By controlling the valves, the requirements of the auxiliary machine cooling system of the solar thermal power station in different operating modes at different time periods can be met, thereby saving energy for the closed water pump in different operating modes.

[0036] The present invention does not require additional automatic shut-off valves for the outlet pipe of the auxiliary cooling water subsystem of the heat exchange system and the outlet pipe of the auxiliary cooling water subsystem of the steam turbine power generation system. Furthermore, when arranging the pipelines, it is not necessary to reserve operation and maintenance space for the automatic shut-off valves for the outlet pipe of the auxiliary cooling water subsystem of the heat exchange system and the outlet pipe of the auxiliary cooling water subsystem of the steam turbine power generation system. This facilitates the use of underground pipes for the outlet pipe of the auxiliary cooling water subsystem of the heat exchange system and the outlet pipe of the auxiliary cooling water subsystem of the steam turbine power generation system, thereby reducing overhead pipes in the factory building and making the factory building layout more concise and beautiful.

[0037] The present invention places the auxiliary equipment of the concentrated solar collector system on the water outlet side of the first water pump subsystem, which can ensure that under any working conditions, there is sufficient water pressure to reach the auxiliary equipment of the concentrated solar collector system arranged at a high position. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0039] Figure 1This is a structural diagram of a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to a first embodiment of the present invention;

[0040] Figure 2 This is a structural diagram of a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to a third embodiment of the present invention;

[0041] Figure 3 This is a structural diagram of a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to a fifth embodiment of the present invention. DETAILED DESCRIPTION

[0042] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0043] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] It should be noted that the flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the methods and systems according to various embodiments of the present invention. It should be noted that each box in the flowchart or block diagram can represent a module, a program segment, or a part of a code, and the module, program segment, or a part of a code may include one or more executable instructions for implementing the logical functions specified in each embodiment. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the flowchart and / or block diagram, and the combination of boxes in the flowchart and / or block diagram can be implemented using a dedicated hardware-based system that performs a specified function or operation, or can be implemented using a combination of dedicated hardware and computer instructions.

[0046] Embodiment 1

[0047] This embodiment provides a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps.

[0048] The cooling system for auxiliary power generation equipment with isolated outlet sides of large and small water pumps provided in this embodiment is as follows: Figure 1 As shown, it includes a small-flow closed-loop cooling water pump (i.e., the first water pump) subsystem, a large-flow closed-loop cooling water pump (i.e., the second water pump) subsystem, a cooling tower subsystem, a concentrated solar collector system auxiliary cooling water subsystem, a heat exchange system auxiliary cooling water subsystem, a steam turbine generator system auxiliary cooling water subsystem, and a closed water tank constant pressure subsystem.

[0049] Among them, the small flow closed-loop cooling water pump subsystem includes a small flow closed-loop cooling water pump (abbreviated as small pump) 1, a small flow closed-loop cooling water pump branch pipe 16, a small flow closed-loop cooling water pump outlet recirculation branch pipe 18-2, and a small flow closed-loop cooling water pump outlet to large pump outlet main pipe 30-2.

[0050] Among them, the first end of the small-flow closed-circulation cooling water pump branch pipe 16 is connected to the outlet of the small-flow closed-circulation cooling water pump front constant pressure pipe 29-2, and the second end is connected to the outlet of the small-flow closed-circulation cooling water pump to the large pump outlet mother pipe 30-2. The small-flow closed-circulation cooling water pump branch pipe 16 is provided with a small-flow closed-circulation cooling water pump inlet side shut-off valve 19-1, a small-flow closed-circulation cooling water pump 1 (i.e., the first water pump), a small-flow closed-circulation cooling water pump outlet side check valve 19-2, and a small-flow closed-circulation cooling water pump outlet side shut-off valve 19-3 in sequence according to the direction of water flow.

[0051] Among them, the outlet of the constant pressure pipeline 29-2 in front of the small-flow closed-loop cooling water pump is also connected to the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe 30-1.

[0052] Among them, the first end of the small-flow closed-loop cooling water pump outlet recirculation branch 18-2 is connected to the first end of the small-flow closed-loop cooling water pump branch 16, and the second end of the small-flow closed-loop cooling water pump outlet recirculation branch 18-2 is connected to the second end of the small-flow closed-loop cooling water pump branch 16.

[0053] Among them, a small-flow closed-cycle cooling water pump outlet recirculation branch pipe valve 21 - 2 is provided on the small-flow closed-cycle cooling water pump outlet recirculation branch pipe 18 - 2.

[0054] Among them, an automatic shut-off valve (also called the first shut-off valve) 7-1 from the outlet of the small-flow closed-cycle cooling water pump to the outlet of the large pump is provided on the main pipe 30-2 from the outlet of the small-flow closed-cycle cooling water pump to the outlet of the large pump.

[0055] The large-flow closed-loop cooling water pump subsystem includes a large-flow closed-loop cooling water pump (referred to as large pump) 2, a large-flow closed-loop cooling water pump branch pipe 17, a large-flow closed-loop cooling water pump outlet recirculation branch pipe 18-1, a large-flow closed-loop cooling water pump outlet mother pipe (referred to as large pump outlet pipe) 22-1, and an auxiliary machine cooling water outlet mother pipe (also known as large pump inlet pipe) 26.

[0056] Among them, the outlet of the constant pressure pipe 29-1 in front of the large-flow closed-circulation cooling water pump is connected to the inlet of the auxiliary machine cooling water outlet main pipe 26, the outlet of the auxiliary machine cooling water outlet main pipe 26 is connected to the first end of the large-flow closed-circulation cooling water pump branch pipe 17, and the second end of the large-flow closed-circulation cooling water pump branch pipe 17 is connected to the large-flow closed-circulation cooling water pump outlet main pipe 22-1. The large-flow closed-circulation cooling water pump branch pipe 17 is provided with a large-flow closed-circulation cooling water pump inlet side shut-off valve 20-1, a large-flow closed-circulation cooling water pump (i.e., the second water pump. The flow rate of the second water pump is greater than that of the first water pump) 2, a large-flow closed-circulation cooling water pump outlet side check valve 20-2, and a large-flow closed-circulation cooling water pump outlet side shut-off valve 20-3 in sequence according to the water flow direction.

[0057] The first end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1 is connected to the first end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 17, and the second end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1 is connected to the second end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 17. A large-flow closed-cycle cooling water pump outlet recirculation branch pipe valve 21-1 is provided on the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1.

[0058] The outlet of the small-flow closed-loop cooling water pump is connected to the large-flow closed-loop cooling water pump outlet main pipe 30-2 and is connected to the large-flow closed-loop cooling water pump outlet main pipe 22-1, and converges into the closed-loop cooling water pump outlet main pipe 22-2.

[0059] The cooling tower subsystem includes a cooling tower 3, a closed-loop cooling water pump outlet main pipe 22-2, a cooling tower bypass branch pipe 23, a cooling tower inlet and outlet water pipe 24, and an auxiliary machine cooling water inlet main pipe 25. The hot auxiliary machine cooling water is further cooled into cold auxiliary machine cooling water by the cooling tower 3. The types of cooling tower 3 include but are not limited to dry cooling towers, wet cooling towers, dry-wet combined cooling towers, and the like.

[0060] Among them, the cooling tower bypass branch pipe 23 and the cooling tower inlet and outlet pipe 24 are respectively connected to the closed-loop cooling water pump outlet main pipe 22-2, and the cooling tower inlet and outlet pipe 24 is provided with a cooling tower water inlet valve 5. The water outlets of the cooling tower bypass branch pipe 23 and the cooling tower inlet and outlet pipe 24 are both connected to the water inlet of the auxiliary machine cooling water inlet main pipe 25, and the cooling tower inlet and outlet pipe 24 is provided with a cooling tower water outlet valve 6. The cooling tower bypass branch pipe 23 is provided with a cooling tower bypass valve 4, and the cooling tower inlet and outlet pipe 24 is provided with a cooling tower 3.

[0061] The auxiliary cooling water subsystem of the concentrated solar collector system includes the auxiliary cooling water subsystem water inlet main pipe 27-1, the auxiliary cooling water subsystem water outlet main pipe 28-1, the auxiliary cooling water subsystem water outlet to the large pump inlet branch pipe 30-1, the automatic shut-off valve (also known as the second shut-off valve) 7-2 from the auxiliary cooling water subsystem water outlet to the large pump inlet branch pipe of the concentrated solar collector system, a number of auxiliary machines of the concentrated solar collector system, a number of manual valves on the water inlet side of the auxiliary machines of the concentrated solar collector system, and a number of manual valves on the water outlet side of the auxiliary machines of the concentrated solar collector system.

[0062] The water inlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system is connected to the water outlet of the auxiliary cooling water inlet main pipe 25. The auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system has several water outlets, and each water outlet is connected to an auxiliary of the concentrating solar collector system, and each auxiliary of the concentrating solar collector system is provided with a manual valve on the water inlet side of the auxiliary of the concentrating solar collector system, and each auxiliary of the concentrating solar collector system is provided with a manual valve on the water outlet side of the auxiliary of the concentrating solar collector system. The water outlets of all auxiliary machines of the concentrated solar collector system are connected to the auxiliary machine cooling water subsystem water outlet mother pipe 28-1 of the concentrated solar collector system, the auxiliary machine cooling water subsystem water outlet mother pipe 28-1 of the concentrated solar collector system is connected to the water inlet of the auxiliary machine cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe 30-1, and the water outlet of the auxiliary machine cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe 30-1 is connected to the auxiliary machine cooling water outlet mother pipe 26.

[0063] An automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrating solar collector system to the inlet branch pipe 30-1 of the large pump is provided.

[0064] Among them, the plurality of concentrating solar collector system auxiliary machines include a first concentrating solar collector system auxiliary machine 8-1, a second concentrating solar collector system auxiliary machine 8-2, and a third concentrating solar collector system auxiliary machine 8-3.

[0065] Among them, several manual valves on the water inlet side of auxiliary equipment of the concentrated solar collector system include a first manual valve 11-1 on the water inlet side of auxiliary equipment of the concentrated solar collector system, a second manual valve 11-2 on the water inlet side of auxiliary equipment of the concentrated solar collector system, and a third manual valve 11-3 on the water inlet side of auxiliary equipment of the concentrated solar collector system.

[0066] Among them, several manual valves on the water outlet side of auxiliary equipment of the concentrated solar collector system include a first manual valve 11-4 on the water outlet side of auxiliary equipment of the concentrated solar collector system, a second manual valve 11-5 on the water outlet side of auxiliary equipment of the concentrated solar collector system, and a third manual valve 11-6 on the water outlet side of auxiliary equipment of the concentrated solar collector system.

[0067] The cold auxiliary cooling water enters the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrated solar collector system to cool the auxiliary equipment of the concentrated solar collector system. After being heated to become hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-1 of the concentrated solar collector system.

[0068] Among them, the auxiliary equipment of the concentrated solar collector system includes but is not limited to the cold molten salt pump.

[0069] The heat exchange system auxiliary machine cooling water subsystem includes the heat exchange system auxiliary machine cooling water subsystem water inlet main pipe 27-2, the heat exchange system auxiliary machine cooling water subsystem water outlet main pipe 28-2, several heat exchange system auxiliary machines, several heat exchange system auxiliary machine water inlet side manual valves, and several heat exchange system auxiliary machine water outlet side manual valves.

[0070] Among them, the water inlet of the auxiliary cooling water subsystem water inlet mother pipe 27-2 of the heat exchange system is connected to the water outlet of the auxiliary cooling water inlet mother pipe 25, and the water inlet mother pipe 27-2 of the auxiliary cooling water subsystem of the heat exchange system has several water outlets, each of which is connected to an auxiliary heat exchange system; a manual valve on the water inlet side of the auxiliary heat exchange system is set at the water inlet of each auxiliary heat exchange system, and a manual valve on the water outlet side of the auxiliary heat exchange system is set at the water outlet of each auxiliary heat exchange system. The water outlets of all auxiliary heat exchange system are connected to the auxiliary cooling water subsystem water outlet mother pipe 28-2 of the heat exchange system, and the water outlet of the auxiliary cooling water subsystem water outlet mother pipe 28-2 of the heat exchange system is connected to the auxiliary cooling water outlet mother pipe 26.

[0071] Among them, the plurality of heat exchange system auxiliary machines include a first heat exchange system auxiliary machine 9-1, a second heat exchange system auxiliary machine 9-2, and a third heat exchange system auxiliary machine 9-3.

[0072] Among them, the plurality of manual valves on the water inlet side of the auxiliary equipment of the heat exchange system include a first manual valve 12-1 on the water inlet side of the auxiliary equipment of the heat exchange system, a second manual valve 12-2 on the water inlet side of the auxiliary equipment of the heat exchange system, and a third manual valve 12-3 on the water inlet side of the auxiliary equipment of the heat exchange system.

[0073] Among them, several manual valves on the water outlet side of the auxiliary equipment of the heat exchange system include a first manual valve 12-4 on the water outlet side of the auxiliary equipment of the heat exchange system, a second manual valve 12-5 on the water outlet side of the auxiliary equipment of the heat exchange system, and a third manual valve 12-6 on the water outlet side of the auxiliary equipment of the heat exchange system.

[0074] The cold auxiliary cooling water enters the auxiliary cooling water subsystem water inlet main pipe 27-2 of the heat exchange system to cool the auxiliary equipment of the heat exchange system. After being heated to become hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-2 of the heat exchange system.

[0075] Among them, the auxiliary equipment of the heat exchange system includes but is not limited to the steam generation system starting circulation pump.

[0076] The auxiliary equipment cooling water subsystem of the steam turbine generator system includes the auxiliary equipment cooling water subsystem inlet main pipe 27-3, the auxiliary equipment cooling water subsystem outlet main pipe 28-3, several auxiliary equipment of the steam turbine generator system, several manual valves on the auxiliary equipment inlet side of the steam turbine generator system, and several manual valves on the auxiliary equipment outlet side of the steam turbine generator system.

[0077] Among them, the water inlet of the auxiliary machine cooling water subsystem water inlet mother pipe 27-3 of the steam turbine generator system is connected to the water outlet of the auxiliary machine cooling water inlet mother pipe 25, the steam turbine generator system auxiliary machine cooling water subsystem water inlet mother pipe 27-3 has several water outlets, each of which is connected to an auxiliary machine of the steam turbine generator system, and the water inlet of each auxiliary machine of the steam turbine generator system is provided with a manual valve on the auxiliary machine inlet side of the steam turbine generator system, and the water outlet of each auxiliary machine of the steam turbine generator system is provided with a manual valve on the auxiliary machine outlet side of the steam turbine generator system; the water outlets of all auxiliary machines of the steam turbine generator system are connected to the auxiliary machine cooling water subsystem water outlet mother pipe 28-3 of the steam turbine generator system. The water outlet of the auxiliary machine cooling water subsystem water outlet mother pipe 28-3 of the steam turbine generator system is connected to the auxiliary machine cooling water outlet mother pipe 26.

[0078] Among them, the plurality of steam turbine power generation system auxiliary machines include a first steam turbine power generation system auxiliary machine 10 - 1 , a second steam turbine power generation system auxiliary machine 10 - 2 , and a third steam turbine power generation system auxiliary machine 10 - 3 .

[0079] Among them, several manual valves on the auxiliary water inlet side of the steam turbine generator system include a first manual valve 13-1 on the auxiliary water inlet side of the steam turbine generator system, a second manual valve 13-2 on the auxiliary water inlet side of the steam turbine generator system, and a third manual valve 13-3 on the auxiliary water inlet side of the steam turbine generator system.

[0080] Among them, several manual valves on the auxiliary water outlet side of the steam turbine generator system include a first manual valve 13-4 on the auxiliary water outlet side of the steam turbine generator system, a second manual valve 13-5 on the auxiliary water outlet side of the steam turbine generator system, and a third manual valve 13-6 on the auxiliary water outlet side of the steam turbine generator system.

[0081] The cold auxiliary cooling water enters the auxiliary cooling water subsystem water inlet main pipe 27-3 of the steam turbine generator system to cool the auxiliary machines of the steam turbine generator system. After being heated to become hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-3 of the steam turbine generator system.

[0082] Among them, the auxiliary equipment of the steam turbine generator system includes but is not limited to the oil tank cooler of the steam turbine generator set.

[0083] The closed water tank constant pressure subsystem includes a closed expansion water tank 14, a shut-off valve 15-1 for the constant pressure pipe in front of a large-flow closed-circulation cooling water pump, and a constant pressure pipe 29-1 in front of a large-flow closed-circulation cooling water pump. Furthermore, it also includes an automatic shut-off valve 15-2 for the constant pressure pipe in front of a small-flow closed-circulation cooling water pump, and a constant pressure pipe 29-2 in front of a small-flow closed-circulation cooling water pump.

[0084] The large-flow closed-loop cooling water pump subsystem is connected to the cooling tower subsystem successively through the large-flow closed-loop cooling water pump outlet mother pipe 22-1 and the closed-loop cooling water pump outlet mother pipe 22-2; the cooling tower subsystem is connected to the auxiliary cooling water subsystem of the concentrated solar collector system, the auxiliary cooling water subsystem of the heat exchange system, and the auxiliary cooling water subsystem of the steam turbine generator system through the auxiliary cooling water inlet mother pipe 25; the auxiliary cooling water subsystem of the heat exchange system and the auxiliary cooling water subsystem of the steam turbine generator system are connected to the large-flow closed-loop cooling water pump group subsystem through the auxiliary cooling water outlet mother pipe 26.

[0085] The small flow closed-loop cooling water pump subsystem is connected to the large flow closed-loop cooling water pump outlet main pipe 22-1 through the small flow closed-loop cooling water pump outlet to the large pump outlet main pipe 30-2. The small flow closed-loop cooling water pump outlet to the large pump outlet main pipe 30-2 and the large flow closed-loop cooling water pump outlet main pipe 22-1 are called the closed-loop cooling water pump outlet main pipe 22-2 after being converged. One end (water inlet) of the small flow closed-loop cooling water pump front constant pressure pipe 29-2 is connected to the closed expansion water tank 14, and the other end (water outlet) is connected to the auxiliary cooling water subsystem outlet main pipe 28-1 of the concentrated solar collector system, and is connected to the small flow closed-loop cooling water pump branch pipe 16. That is, the water inlet of the small-flow closed-loop cooling water pump branch pipe 16, the water outlet of the auxiliary cooling water subsystem water outlet main pipe 28-1 of the concentrated solar collector system, and the water outlet of the small-flow closed-loop cooling water pump front constant pressure pipe 29-2 are connected.

[0086] The water inlet of the closed expansion water tank 14 is connected to the desalted water supply pipeline.

[0087] The rated flow rate of the small flow closed-loop cooling water pump is less than 1 / 10 of the rated flow rate of the large flow closed-loop cooling water pump. Specific embodiment: The design flow rate of the large flow closed-loop cooling water pump of a certain project is 800t / h, and the design flow rate of the small flow closed-loop cooling water pump is 10t / h.

[0088] The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps provided in this embodiment meets the requirements of the auxiliary machine cooling system for the operation modes of the solar thermal power station in different time periods, and saves energy for the closed water pumps operating in different operation modes.

[0089] The cooling system for auxiliary power generation equipment with isolated outlet sides of large and small water pumps provided in this embodiment does not need to additionally set up the automatic shut-off valve of the outlet main pipe 28-2 of the auxiliary cooling water subsystem of the heat exchange system and the automatic shut-off valve of the outlet main pipe 28-3 of the auxiliary cooling water subsystem of the steam turbine power generation system. Since it is generally believed that the maintenance of valves located on buried pipelines is relatively cumbersome and requires additional special valve wells, the automatic shut-off valve of the outlet main pipe 28-2 of the auxiliary cooling water subsystem of the heat exchange system and the automatic shut-off valve of the outlet main pipe 28-3 of the auxiliary cooling water subsystem of the steam turbine power generation system are cancelled in this embodiment, so that the outlet main pipe 28-2 of the auxiliary cooling water subsystem of the heat exchange system and the outlet main pipe 28-3 of the auxiliary cooling water subsystem of the steam turbine power generation system are conveniently arranged in the buried pipeline, thereby reducing the overhead pipelines in the factory building, making the factory building layout more concise and beautiful.

[0090] Since the conventional manual valves 11-1 to 11-6 on the auxiliary water inlet side of the concentrated solar collector system, the manual valves 12-1 to 12-6 on the auxiliary water inlet side of the heat exchange system, the manual valves 13-1 to 13-6 on the auxiliary water outlet side of the steam turbine generator system, and the manual valves 13-1 to 13-6 on the auxiliary water inlet side of the steam turbine generator system are all manual valves and cannot be automatically switched, the present embodiment provides an automatic shut-off valve 7-1 from the outlet of the small-flow closed-circulation cooling water pump to the outlet main pipe of the large pump and an automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump, and the small-flow closed-circulation cooling water pump to the outlet main pipe of the large pump and the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump are provided respectively. The automatic shut-off valve 7-1 from the outlet of the closed-circuit cooling water pump to the outlet main pipe of the large pump and the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump have an automatic switching function, which is specifically realized by remotely controlling the electric actuator, the pneumatic actuator or the hydraulic actuator. Then, by switching the automatic shut-off valve 7-1 from the outlet of the small-flow closed-circuit cooling water pump to the outlet main pipe of the large pump, the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump and the shut-off valve 20-3 on the outlet side of the large-flow closed-circuit cooling water pump, the isolation and merging of the outlet sides of the large-flow closed-circuit cooling water pumps are realized, thereby meeting the requirements of the auxiliary cooling system for the operation mode of the solar thermal power station in different time periods.

[0091] Embodiment 2

[0092] This embodiment provides a control method for the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in the first embodiment.

[0093] The control method of the power generation auxiliary machine cooling system with the outlet sides of the large and small water pumps isolated as described in the first embodiment provided in this embodiment includes:

[0094] (1) When the solar collector system, heat exchange system and steam turbine generator system are all in operation, close the cooling tower bypass valve 4, the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the automatic shut-off valve 7-1 from the outlet of the small-flow closed-circulation cooling water pump to the outlet of the large pump; open the cooling tower inlet valve 5, the cooling tower outlet valve 6, the shut-off valve 20-1 on the water inlet side of the large-flow closed-circulation cooling water pump, and the shut-off valve 20-3 on the water outlet side of the large-flow closed-circulation cooling water pump. The shut-off valve 20-3 on the outlet side of the closed-loop cooling water pump, the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe, and the shut-off valve 15-1 of the constant pressure pipeline in front of the large-flow closed-loop cooling water pump; turn off the small-flow closed-loop cooling water pump 1, and turn on the large-flow closed-loop cooling water pump 2; that is: only run the large-flow closed-loop cooling water pump 2, and the large-flow cooling water is cooled through the cooling tower and then returns to the auxiliary cooling water inlet main pipe 25.

[0095] (2) When the power grid does not require the CSP power station to generate electricity (i.e., the power generation is 0) and the sunshine conditions during the day are good, there is a condition where only the CSP system is running, while the heat exchange system and the steam turbine power generation system are not running. In this condition, the cooling tower inlet valve 5, the cooling tower outlet valve 6, the large-flow closed-loop cooling water pump inlet side shut-off valve 20-1, the large-flow closed-loop cooling water pump outlet side shut-off valve 20-3, and the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the CSP system to the large pump inlet branch pipe are closed; the cooling tower bypass valve 4, the small-flow closed-loop cooling water pump inlet side shut-off valve 19-1, and the small-flow closed-loop cooling water pump outlet side shut-off valve 20-3 are opened. Shut-off valve 19-3 on the outlet side of the water pump, automatic shut-off valve 15-2 on the constant pressure pipeline in front of the small-flow closed-loop cooling water pump, and automatic shut-off valve 7-1 on the outlet of the small-flow closed-loop cooling water pump to the outlet main pipe of the large pump; turn off the large-flow closed-loop cooling water pump 2, and turn on the small-flow closed-loop cooling water pump 1; that is, only the small-flow closed-loop cooling water pump 1 is operated, and the small-flow cooling water is not cooled by the cooling tower, but is dissipated along the way through the bypass branch of the cooling tower and then returns to the auxiliary machine cooling water inlet main pipe 25. The shut-off valve 20-1 on the inlet side of the large-flow closed-loop cooling water pump and the automatic shut-off valve 7-2 of the large pump branch pipe are all closed, and this part of the water does not flow.

[0096] Among them, the method of switching from a large-flow closed-circulation cooling water pump to a small-flow closed-circulation cooling water pump is as follows:

[0097] 1) When the automatic shut-off valve 7-1 for the outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump is closed and the automatic shut-off valve 7-2 for the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump is opened, the large-flow closed-cycle cooling water pump 2 is opened to connect the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet pipe 26 of the large pump, and then enter the cooling tower subsystem after passing through the large-flow closed-cycle cooling water pump 2;

[0098] 2) Open the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the valve 21-2 on the outlet recirculation branch pipe of the small-flow closed-circulation cooling water pump, open the small-flow closed-circulation cooling water pump 1, and establish the minimum flow circulation of the small-flow closed-circulation cooling water pump 1;

[0099] 3) After the minimum flow cycle of the small-flow closed-loop cooling water pump 1 is established and the operation of the small-flow closed-loop cooling water pump tends to be stable, open the automatic shut-off valve 7-1 of the outlet of the small-flow closed-loop cooling water pump to the outlet main pipe of the large pump, and close the automatic shut-off valve 7-2 of the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump, so as to connect the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the outlet pipe 22-1 of the large pump, and then enter the cooling tower subsystem;

[0100] 4) After the small-flow closed-loop cooling water pump 1 is established to supply water to the concentrating and collecting subsystem, the large-flow closed-loop cooling water pump 2 is closed to complete the switch from the large-flow closed-loop cooling water pump to the small-flow closed-loop cooling water pump.

[0101] Embodiment 3

[0102] This embodiment provides a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps.

[0103] The cooling system for auxiliary power generation equipment with isolated outlet sides of large and small water pumps provided in this embodiment is as follows: Figure 2 As shown, it includes a small-flow closed-loop cooling water pump subsystem, a large-flow closed-loop cooling water pump subsystem, a cooling tower subsystem, a concentrated solar collector system auxiliary cooling water subsystem, a heat exchange system auxiliary cooling water subsystem, a steam turbine generator system auxiliary cooling water subsystem, and a closed water tank constant pressure subsystem.

[0104] Among them, the small-flow closed-loop cooling water pump subsystem includes a small-flow closed-loop cooling water pump (referred to as small pump) 1, a small-flow closed-loop cooling water pump branch pipe 16, a small-flow closed-loop cooling water pump outlet recirculation branch pipe 18-2, a small-flow closed-loop cooling water pump outlet to large pump outlet main pipe 30-2, and a concentrated solar collector system auxiliary machine cooling water subsystem water inlet branch pipe 18-3.

[0105] Among them, the first end of the small-flow closed-loop cooling water pump branch pipe 16 is connected to the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and is close to the water inlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and the second end is also connected to the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and is close to the water outlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system. The small-flow closed-loop cooling water pump branch pipe 16 is provided with a small-flow closed-loop cooling water pump inlet side shut-off valve 19-1, a small-flow closed-loop cooling water pump 1, a small-flow closed-loop cooling water pump outlet side check valve 19-2, and a small-flow closed-loop cooling water pump outlet side shut-off valve 19-3 in sequence according to the direction of water flow.

[0106] Among them, the first end of the small-flow closed-loop cooling water pump outlet recirculation branch 18-2 is connected to the first end of the small-flow closed-loop cooling water pump branch 16, and the second end of the small-flow closed-loop cooling water pump outlet recirculation branch 18-2 is connected to the second end of the small-flow closed-loop cooling water pump branch 16.

[0107] Among them, a small-flow closed-cycle cooling water pump outlet recirculation branch pipe valve 21 - 2 is provided on the small-flow closed-cycle cooling water pump outlet recirculation branch pipe 18 - 2.

[0108] Among them, the section of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrated solar collector system between the first end and the second end of the small flow closed cycle cooling water pump branch pipe 16 can be called the auxiliary cooling water subsystem water inlet branch pipe 18-3 of the concentrated solar collector system (set between the water inlet and the water outlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrated solar collector system), and the auxiliary cooling water subsystem water inlet branch pipe valve 21-3 of the concentrated solar collector system is set on the auxiliary cooling water subsystem water inlet branch pipe 18-3 of the concentrated solar collector system. The auxiliary cooling water subsystem water inlet branch pipe 18-3 of the concentrated solar collector system is set in parallel with the small flow closed cycle cooling water pump branch pipe 16 (i.e., the first water pump branch pipe) and the small flow closed cycle cooling water pump outlet recirculation branch pipe 18-2 (i.e., the first water pump outlet recirculation branch pipe).

[0109] Among them, a small-flow closed-loop cooling water pump outlet to the auxiliary machine cooling water subsystem water inlet main pipe shut-off valve 21-4 is provided on the pipeline connecting the second end of the small-flow closed-loop cooling water pump branch pipe 16 and the auxiliary machine cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system.

[0110] Among them, an automatic shut-off valve 7-1 from the outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump is provided on the outlet main pipe 30-2 from the outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump.

[0111] The large-flow closed-loop cooling water pump subsystem includes a large-flow closed-loop cooling water pump (referred to as large pump) 2, a large-flow closed-loop cooling water pump branch pipe 17, a large-flow closed-loop cooling water pump outlet recirculation branch pipe 18-1, a large-flow closed-loop cooling water pump outlet mother pipe (referred to as large pump outlet pipe) 22-1, a closed-loop cooling water pump outlet mother pipe 22-2, and an auxiliary machine cooling water outlet mother pipe (also known as large pump inlet pipe) 26.

[0112] Among them, the outlet of the constant pressure pipe 29-1 in front of the large-flow closed-circulation cooling water pump is connected to the inlet of the auxiliary machine cooling water outlet main pipe 26, the outlet of the auxiliary machine cooling water outlet main pipe 26 is connected to the first end of the large-flow closed-circulation cooling water pump branch pipe 17, and the second end of the large-flow closed-circulation cooling water pump branch pipe 17 is connected to the large-flow closed-circulation cooling water pump outlet main pipe 22-1. The large-flow closed-circulation cooling water pump branch pipe 17 is provided with a large-flow closed-circulation cooling water pump inlet side shut-off valve 20-1, a large-flow closed-circulation cooling water pump (abbreviated as, large pump) 2, a large-flow closed-circulation cooling water pump outlet side check valve 20-2, and a large-flow closed-circulation cooling water pump outlet side shut-off valve 20-3 in sequence according to the water flow direction.

[0113] The first end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1 is connected to the first end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 17, and the second end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1 is connected to the second end of the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 17. A large-flow closed-cycle cooling water pump outlet recirculation branch pipe valve 21-1 is provided on the large-flow closed-cycle cooling water pump outlet recirculation branch pipe 18-1.

[0114] The cooling tower subsystem includes a cooling tower 3, a cooling tower bypass branch pipe 23, a cooling tower inlet and outlet pipe 24, and an auxiliary machine cooling water inlet main pipe 25. The hot auxiliary machine cooling water is further cooled into cold auxiliary machine cooling water by the cooling tower 3. The types of the cooling tower 3 include, but are not limited to, a dry cooling tower, a wet cooling tower, a dry-wet combined cooling tower, and the like.

[0115] Among them, the cooling tower bypass branch pipe 23 and the cooling tower inlet and outlet pipe 24 are respectively connected to the outlet main pipe 22-1 of the large-flow closed-cycle cooling water pump, and the cooling tower water inlet valve 5 is arranged on the outlet main pipe 22-2 of the closed-cycle cooling water pump, and the cooling tower water inlet valve 5 is arranged in the cooling tower inlet and outlet pipe 24. The water outlets of the cooling tower bypass branch pipe 23 and the cooling tower inlet and outlet pipe 24 are both connected to the water inlet of the auxiliary machine cooling water inlet main pipe 25. The cooling tower bypass branch pipe 23 is provided with a cooling tower bypass valve 4, and the cooling tower inlet and outlet pipe 24 is provided with a cooling tower 3. According to the direction of water flow, the cooling tower inlet valve 5, the cooling tower 3 and the cooling tower outlet valve 6 are arranged on the cooling tower inlet and outlet pipe 24 in sequence.

[0116] The auxiliary cooling water subsystem of the concentrated solar collector system includes the auxiliary cooling water subsystem water inlet main pipe 27-1, the auxiliary cooling water subsystem water outlet main pipe 28-1, the auxiliary cooling water subsystem water outlet to the large pump inlet branch pipe 30-1, the auxiliary cooling water subsystem water outlet to the large pump inlet branch pipe automatic shut-off valve 7-2, several auxiliary machines of the concentrated solar collector system, several manual valves on the water inlet side of the auxiliary machines of the concentrated solar collector system, and several manual valves on the water outlet side of the auxiliary machines of the concentrated solar collector system.

[0117] The water inlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system is connected to the water outlet of the auxiliary cooling water inlet main pipe 25. The auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system has several water outlets, and each water outlet is connected to an auxiliary of the concentrating solar collector system, and each auxiliary of the concentrating solar collector system is provided with a manual valve on the water inlet side of the auxiliary of the concentrating solar collector system, and each auxiliary of the concentrating solar collector system is provided with a manual valve on the water outlet side of the auxiliary of the concentrating solar collector system. The water outlets of all auxiliary machines of the concentrated solar collector system are connected to the auxiliary machine cooling water subsystem outlet main pipe 28-1 of the concentrated solar collector system. The auxiliary machine cooling water subsystem outlet main pipe 28-1 of the concentrated solar collector system is connected to the water inlet of the auxiliary machine cooling water subsystem outlet to the large pump inlet branch pipe 30-1 of the concentrated solar collector system and the water inlet of the small flow closed-loop cooling water pump outlet to the large pump outlet main pipe 30-2. The outlet of the auxiliary machine cooling water subsystem outlet to the large pump inlet branch pipe 30-1 of the concentrated solar collector system is connected to the auxiliary machine cooling water outlet main pipe 26. The outlet of the small flow closed-loop cooling water pump outlet to the large pump outlet main pipe 30-2 is connected to the large flow closed-loop cooling water pump outlet main pipe 22-1. The small flow closed-loop cooling water pump outlet to the large pump outlet main pipe 30-2 merges with the large flow closed-loop cooling water pump outlet main pipe 22-1 to form the closed-loop cooling water pump outlet main pipe 22-2.

[0118] An automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrating solar collector system to the inlet branch pipe 30-1 of the large pump is provided.

[0119] Among them, the plurality of concentrating solar collector system auxiliary machines include a first concentrating solar collector system auxiliary machine 8-1, a second concentrating solar collector system auxiliary machine 8-2, and a third concentrating solar collector system auxiliary machine 8-3.

[0120] Among them, several manual valves on the water inlet side of auxiliary equipment of the concentrated solar collector system include a first manual valve 11-1 on the water inlet side of auxiliary equipment of the concentrated solar collector system, a second manual valve 11-2 on the water inlet side of auxiliary equipment of the concentrated solar collector system, and a third manual valve 11-3 on the water inlet side of auxiliary equipment of the concentrated solar collector system.

[0121] Among them, several manual valves on the water outlet side of auxiliary equipment of the concentrated solar collector system include a first manual valve 11-4 on the water outlet side of auxiliary equipment of the concentrated solar collector system, a second manual valve 11-5 on the water outlet side of auxiliary equipment of the concentrated solar collector system, and a third manual valve 11-6 on the water outlet side of auxiliary equipment of the concentrated solar collector system.

[0122] The cold auxiliary cooling water passes through a small-flow closed-loop cooling water pump subsystem and enters the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrated solar collector system to cool the auxiliary equipment of the concentrated solar collector system. After being heated and converted into hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-1 of the concentrated solar collector system.

[0123] The heat exchange system auxiliary machine cooling water subsystem includes the heat exchange system auxiliary machine cooling water subsystem water inlet main pipe 27-2, the heat exchange system auxiliary machine cooling water subsystem water outlet main pipe 28-2, several heat exchange system auxiliary machines, several heat exchange system auxiliary machine water inlet side manual valves, and several heat exchange system auxiliary machine water outlet side manual valves.

[0124] Among them, the water inlet of the auxiliary cooling water subsystem water inlet mother pipe 27-2 of the heat exchange system is connected to the water outlet of the auxiliary cooling water inlet mother pipe 25, and the water inlet mother pipe 27-2 of the auxiliary cooling water subsystem of the heat exchange system has several water outlets, each of which is connected to an auxiliary heat exchange system; a manual valve on the water inlet side of the auxiliary heat exchange system is set at the water inlet of each auxiliary heat exchange system, and a manual valve on the water outlet side of the auxiliary heat exchange system is set at the water outlet of each auxiliary heat exchange system. The water outlets of all auxiliary heat exchange system are connected to the auxiliary cooling water subsystem water outlet mother pipe 28-2 of the heat exchange system, and the water outlet of the auxiliary cooling water subsystem water outlet mother pipe 28-2 of the heat exchange system is connected to the auxiliary cooling water outlet mother pipe 26.

[0125] Among them, the plurality of heat exchange system auxiliary machines include a first heat exchange system auxiliary machine 9-1, a second heat exchange system auxiliary machine 9-2, and a third heat exchange system auxiliary machine 9-3.

[0126] Among them, the plurality of manual valves on the water inlet side of the auxiliary equipment of the heat exchange system include a first manual valve 12-1 on the water inlet side of the auxiliary equipment of the heat exchange system, a second manual valve 12-2 on the water inlet side of the auxiliary equipment of the heat exchange system, and a third manual valve 12-3 on the water inlet side of the auxiliary equipment of the heat exchange system.

[0127] Among them, several manual valves on the water outlet side of the auxiliary equipment of the heat exchange system include a first manual valve 12-4 on the water outlet side of the auxiliary equipment of the heat exchange system, a second manual valve 12-5 on the water outlet side of the auxiliary equipment of the heat exchange system, and a third manual valve 12-6 on the water outlet side of the auxiliary equipment of the heat exchange system.

[0128] The cold auxiliary cooling water enters the auxiliary cooling water subsystem water inlet main pipe 27-2 of the heat exchange system to cool the auxiliary equipment of the heat exchange system. After being heated to become hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-2 of the heat exchange system.

[0129] Among them, the auxiliary equipment of the heat exchange system includes but is not limited to the steam generation system starting circulation pump.

[0130] The auxiliary equipment cooling water subsystem of the steam turbine generator system includes the auxiliary equipment cooling water subsystem inlet main pipe 27-3, the auxiliary equipment cooling water subsystem outlet main pipe 28-3, several auxiliary equipment of the steam turbine generator system, several manual valves on the auxiliary equipment inlet side of the steam turbine generator system, and several manual valves on the auxiliary equipment outlet side of the steam turbine generator system.

[0131] Among them, the water inlet of the auxiliary machine cooling water subsystem water inlet mother pipe 27-3 of the steam turbine generator system is connected to the water outlet of the auxiliary machine cooling water inlet mother pipe 25, the steam turbine generator system auxiliary machine cooling water subsystem water inlet mother pipe 27-3 has several water outlets, each of which is connected to an auxiliary machine of the steam turbine generator system, and the water inlet of each auxiliary machine of the steam turbine generator system is provided with a manual valve on the auxiliary machine inlet side of the steam turbine generator system, and the water outlet of each auxiliary machine of the steam turbine generator system is provided with a manual valve on the auxiliary machine outlet side of the steam turbine generator system; the water outlets of all auxiliary machines of the steam turbine generator system are connected to the auxiliary machine cooling water subsystem water outlet mother pipe 28-3 of the steam turbine generator system. The water outlet of the auxiliary machine cooling water subsystem water outlet mother pipe 28-3 of the steam turbine generator system is connected to the auxiliary machine cooling water outlet mother pipe 26.

[0132] Among them, the plurality of steam turbine power generation system auxiliary machines include a first steam turbine power generation system auxiliary machine 10 - 1 , a second steam turbine power generation system auxiliary machine 10 - 2 , and a third steam turbine power generation system auxiliary machine 10 - 3 .

[0133] Among them, several manual valves on the auxiliary water inlet side of the steam turbine generator system include a first manual valve 13-1 on the auxiliary water inlet side of the steam turbine generator system, a second manual valve 13-2 on the auxiliary water inlet side of the steam turbine generator system, and a third manual valve 13-3 on the auxiliary water inlet side of the steam turbine generator system.

[0134] Among them, several manual valves on the auxiliary water outlet side of the steam turbine generator system include a first manual valve 13-4 on the auxiliary water outlet side of the steam turbine generator system, a second manual valve 13-5 on the auxiliary water outlet side of the steam turbine generator system, and a third manual valve 13-6 on the auxiliary water outlet side of the steam turbine generator system.

[0135] The cold auxiliary cooling water enters the auxiliary cooling water subsystem water inlet main pipe 27-3 of the steam turbine generator system to cool the auxiliary machines of the steam turbine generator system. After being heated to become hot auxiliary cooling water, the cold auxiliary cooling water enters the auxiliary cooling water subsystem water outlet main pipe 28-3 of the steam turbine generator system.

[0136] Among them, the auxiliary equipment of the steam turbine generator system includes but is not limited to the oil tank cooler of the steam turbine generator set.

[0137] The closed water tank constant pressure subsystem includes a closed expansion water tank 14 and a large-flow closed-circulation cooling water pump front constant pressure pipeline 29-1. One end of the large-flow closed-circulation cooling water pump front constant pressure pipeline 29-1 is connected to the water outlet of the closed expansion water tank 14, and the other end is connected to the auxiliary machine cooling water outlet main pipe 26. A large-flow closed-circulation cooling water pump front constant pressure pipeline shut-off valve 15-1 is provided on the large-flow closed-circulation cooling water pump front constant pressure pipeline 29-1.

[0138] The large-flow closed-loop cooling water pump subsystem is connected to the cooling tower subsystem through the large-flow closed-loop cooling water pump outlet mother pipe 22-1 and the closed-loop cooling water pump outlet mother pipe 22-2; the cooling tower subsystem is connected to the auxiliary cooling water subsystem of the concentrated solar collector system, the auxiliary cooling water subsystem of the heat exchange system, and the auxiliary cooling water subsystem of the steam turbine generator system through the auxiliary cooling water inlet mother pipe 25; the auxiliary cooling water subsystem of the heat exchange system and the auxiliary cooling water subsystem of the steam turbine generator system are connected to the large-flow closed-loop cooling water pump group subsystem through the auxiliary cooling water outlet mother pipe 26.

[0139] The water inlet of the closed expansion water tank 14 is connected to the desalted water supply pipeline.

[0140] The cooling system for auxiliary power generation equipment with isolated outlet sides of large and small water pumps provided in this embodiment is, compared with the first embodiment, the auxiliary equipment of the concentrated solar collector system is located on the outlet side of the small pump, that is, the small pump is located on the inlet side of the auxiliary equipment of the concentrated solar collector system, thereby reducing one constant pressure pipeline, that is, canceling 15-2 and 29-2, and adding 18-3, 21-3, and 21-4.

[0141] Compared with the first embodiment, it has the following advantages: the cold molten salt pump is one of the auxiliary machines in the concentrated solar collector subsystem, and the cold molten salt pump is arranged above the cold molten salt tank, at a higher position, and requires a higher pressure head of cooling water. Therefore, when the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps provided in this embodiment is adopted, the auxiliary machine of the concentrated solar collector system is located on the outlet side of the small pump, which can ensure that under any working conditions, the cooling water has sufficient pressure head to reach the auxiliary machine of the concentrated solar collector system arranged at a high position.

[0142] Embodiment 4

[0143] This embodiment provides a control method for the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in the third embodiment.

[0144] The control method of the power generation auxiliary machine cooling system with the outlet sides of the large and small water pumps isolated as described in the third embodiment provided in this embodiment includes:

[0145] (1) When the solar collector system, heat exchange system and steam turbine generator system are all in operation, close the cooling tower bypass valve 4, the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the automatic shut-off valve 7-1 from the outlet of the small-flow closed-circulation cooling water pump to the outlet of the large pump; open the cooling tower inlet valve 5, the cooling tower outlet valve 6, the shut-off valve 20-1 on the water inlet side of the large-flow closed-circulation cooling water pump, and the shut-off valve 20-3 on the water outlet side of the large-flow closed-circulation cooling water pump. The shut-off valve 20-3 on the outlet side of the closed-loop cooling water pump, the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe, and the shut-off valve 15-1 of the constant pressure pipeline in front of the large-flow closed-loop cooling water pump; turn off the small-flow closed-loop cooling water pump 1, and turn on the large-flow closed-loop cooling water pump 2; that is: only run the large-flow closed-loop cooling water pump 2, and the large-flow cooling water is cooled through the cooling tower and then returns to the auxiliary cooling water inlet main pipe 25.

[0146] (2) When the power grid does not require the CSP power station to generate electricity (i.e., the power generation is 0) and the sunshine conditions during the day are good, there is a condition where only the CSP system is running, while the heat exchange system and the steam turbine power generation system are not running. In this condition, the cooling tower inlet valve 5, the cooling tower outlet valve 6, the large-flow closed-loop cooling water pump inlet side shut-off valve 20-1, the large-flow closed-loop cooling water pump outlet side shut-off valve 20-3, and the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the CSP system to the large pump inlet branch pipe are closed; the cooling tower bypass valve 4, the small-flow closed-loop cooling water pump inlet valve 6, the large-flow closed-loop cooling water pump outlet valve 6, and the large-flow closed-loop cooling water pump outlet valve 6 are opened. Water side shut-off valve 19-1, small flow closed-circuit cooling water pump outlet side shut-off valve 19-3, small flow closed-circuit cooling water pump outlet to large pump outlet main pipe automatic shut-off valve 7-1; close large flow closed-circuit cooling water pump 2, open small flow closed-circuit cooling water pump 1; that is: only small flow closed-circuit cooling water pump 1 is operated, small flow cooling water is not cooled by cooling tower, but passes through closed-circuit cooling water pump outlet main pipe 22-2, cooling tower bypass branch pipe 23, and auxiliary machine cooling water inlet main pipe 25, and then returns to small flow closed-circuit cooling water pump branch pipe 16 after heat dissipation along the way. At this time, the heat exchange system is not in operation.

[0147] Among them, the method of switching from a large-flow closed-circulation cooling water pump to a small-flow closed-circulation cooling water pump is as follows:

[0148] 1) When the shut-off valve 21-4 of the water inlet main pipe of the auxiliary cooling water subsystem of the concentrated solar collector system and the automatic shut-off valve 7-1 of the water outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump are closed, and the valve 21-3 of the water inlet branch pipe of the auxiliary cooling water subsystem of the concentrated solar collector system and the automatic shut-off valve 7-2 of the water outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump are opened, the large-flow closed-cycle cooling water pump 2 is opened to connect the outlet water of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet pipe 26 of the large pump, and then enter the cooling tower subsystem after passing through the large-flow closed-cycle cooling water pump 2;

[0149] 2) Open the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the valve 21-2 on the outlet recirculation branch pipe of the small-flow closed-circulation cooling water pump, open the small-flow closed-circulation cooling water pump 1, and establish the minimum flow circulation of the small-flow closed-circulation cooling water pump 1;

[0150] 3) After the minimum flow cycle of the small-flow closed-loop cooling water pump 1 is established and the operation of the small-flow closed-loop cooling water pump tends to be stable, open the shut-off valve 21-4 of the water inlet main pipe of the auxiliary cooling water subsystem of the concentrated solar collector system, close the valve 21-3 of the water inlet branch pipe of the auxiliary cooling water subsystem of the concentrated solar collector system, open the automatic shut-off valve 7-1 of the outlet of the small-flow closed-loop cooling water pump to the outlet main pipe of the large pump, close the automatic shut-off valve 7-2 of the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump, and realize connecting the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the outlet pipe 22-1 of the large pump, and then entering the cooling tower subsystem;

[0151] 4) After the small-flow closed-loop cooling water pump 1 is established to supply water to the concentrating and collecting subsystem, the large-flow closed-loop cooling water pump 2 is closed to complete the switch from the large-flow closed-loop cooling water pump to the small-flow closed-loop cooling water pump.

[0152] Embodiment 5

[0153] This embodiment provides a power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps.

[0154] The cooling system for auxiliary power generation equipment with isolated outlet sides of large and small water pumps provided in this embodiment is as follows: Figure 3 As shown, it includes a small-flow closed-loop cooling water pump subsystem, a large-flow closed-loop cooling water pump subsystem, a cooling tower subsystem, a concentrated solar collector system auxiliary cooling water subsystem, a heat exchange system auxiliary cooling water subsystem, a steam turbine generator system auxiliary cooling water subsystem, and a closed water tank constant pressure subsystem.

[0155] The power generation auxiliary equipment cooling system with isolated large and small water pumps on the outlet side provided in this embodiment is compared with the third embodiment. Considering that the power of the small pump is smaller, the minimum flow circulation of the small-flow closed-loop cooling water pump is easier to establish. Therefore, the water inlet branch pipe 18-3 of the auxiliary equipment cooling water subsystem of the concentrating solar collector system, the water inlet branch pipe valve 21-3 of the auxiliary equipment cooling water subsystem of the concentrating solar collector system, and the water inlet main pipe shut-off valve 21-4 of the auxiliary equipment cooling water subsystem of the concentrating solar collector system are further cancelled.

[0156] Among them, the small flow closed-loop cooling water pump subsystem includes a small flow closed-loop cooling water pump (abbreviated as small pump) 1, a small flow closed-loop cooling water pump branch pipe 16, a small flow closed-loop cooling water pump outlet recirculation branch pipe 18-2, and a small flow closed-loop cooling water pump outlet to large pump outlet main pipe 30-2.

[0157] Among them, the first end of the small-flow closed-loop cooling water pump branch pipe 16 is connected to the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and is close to the water inlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and the second end is also connected to the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system, and is close to the water outlet of the auxiliary cooling water subsystem water inlet main pipe 27-1 of the concentrating solar collector system. The small-flow closed-loop cooling water pump branch pipe 16 is provided with a small-flow closed-loop cooling water pump inlet side shut-off valve 19-1, a small-flow closed-loop cooling water pump 1, a small-flow closed-loop cooling water pump outlet side check valve 19-2, and a small-flow closed-loop cooling water pump outlet side shut-off valve 19-3 in sequence according to the direction of water flow.

[0158] Among them, the section of the water inlet main pipe 27-1 of the auxiliary cooling water subsystem of the concentrated solar collector system between the first end and the second end of the small-flow closed-loop cooling water pump branch pipe 16 can be called the small-flow closed-loop cooling water pump outlet recirculation branch pipe 18-2 (arranged between the water inlet and outlet of the water inlet main pipe 27-1 of the auxiliary cooling water subsystem of the concentrated solar collector system), and the small-flow closed-loop cooling water pump outlet recirculation branch pipe 18-2 is provided with a small-flow closed-loop cooling water pump outlet recirculation branch pipe valve 21-2.

[0159] Among them, the large-flow closed-loop cooling water pump subsystem, cooling tower subsystem, auxiliary cooling water subsystem of the concentrated solar collector system, auxiliary cooling water subsystem of the heat exchange system, auxiliary cooling water subsystem of the steam turbine generator system, and closed water tank constant pressure subsystem are all consistent with Example 3.

[0160] Compared with the third embodiment, the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps provided in this embodiment has a temporary instability in the water supply system, but since three valves are eliminated, it saves investment on the one hand and simplifies the operation logic on the other hand.

[0161] Embodiment 6

[0162] This embodiment provides a control method for the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in the fifth embodiment.

[0163] The control method of the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in the fifth embodiment provided in this embodiment includes:

[0164] (1) When the solar collector system, heat exchange system and steam turbine generator system are all in operation, close the cooling tower bypass valve 4, the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the automatic shut-off valve 7-1 from the outlet of the small-flow closed-circulation cooling water pump to the outlet of the large pump; open the cooling tower inlet valve 5, the cooling tower outlet valve 6, the shut-off valve 20-1 on the water inlet side of the large-flow closed-circulation cooling water pump, and the shut-off valve 20-3 on the water outlet side of the large-flow closed-circulation cooling water pump. The shut-off valve 20-3 on the outlet side of the closed-loop cooling water pump, the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the large pump inlet branch pipe, and the shut-off valve 15-1 of the constant pressure pipeline in front of the large-flow closed-loop cooling water pump; turn off the small-flow closed-loop cooling water pump 1, and turn on the large-flow closed-loop cooling water pump 2; that is: only run the large-flow closed-loop cooling water pump 2, and the large-flow cooling water is cooled through the cooling tower and then returns to the auxiliary cooling water inlet main pipe 25.

[0165] (2) When the sunshine conditions are good during the day, and only the solar collector system is running, while the heat exchange system and the steam turbine generator system are not running, close the cooling tower inlet valve 5, cooling tower outlet valve 6, large-flow closed-loop cooling water pump inlet side shut-off valve 20-1, large-flow closed-loop cooling water pump outlet side shut-off valve 20-3, and the automatic shut-off valve 7-2 from the outlet of the auxiliary cooling water subsystem of the solar collector system to the large pump inlet branch pipe; open the cooling tower bypass valve 4, the small-flow closed-loop cooling water pump inlet side shut-off valve 19-1, and the small-flow closed-loop cooling water pump outlet side shut-off valve 19-3. The shut-off valve 19-3 on the outlet side of the cooling water pump and the automatic shut-off valve 7-1 from the outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump are turned off; the large-flow closed-cycle cooling water pump 2 is turned off, and the small-flow closed-cycle cooling water pump 1 is turned on; that is, only the small-flow closed-cycle cooling water pump 1 is operated, and the small-flow cooling water is not cooled by the cooling tower, but passes through the outlet main pipe 22-2 of the closed-cycle cooling water pump, the bypass branch pipe 23 of the cooling tower, and the auxiliary machine cooling water inlet main pipe 25 to dissipate heat along the way and then return to the small-flow closed-cycle cooling water pump branch pipe 16. At this time, the heat exchange system is not running and the water does not flow.

[0166] Among them, the method of switching from a large-flow closed-circulation cooling water pump to a small-flow closed-circulation cooling water pump is as follows:

[0167] 1) When the automatic shut-off valve 7-1 for the outlet of the small-flow closed-cycle cooling water pump to the outlet main pipe of the large pump is closed, and the automatic shut-off valve 7-2 for the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump is opened, the large-flow closed-cycle cooling water pump 2 is opened to connect the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet pipe 26 of the large pump, and then enter the cooling tower subsystem after passing through the large-flow closed-cycle cooling water pump 2;

[0168] 2) Open the shut-off valve 19-1 on the water inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve 19-3 on the water outlet side of the small-flow closed-circulation cooling water pump, and the valve 21-2 on the outlet recirculation branch pipe of the small-flow closed-circulation cooling water pump, open the small-flow closed-circulation cooling water pump 1, and establish the minimum flow circulation of the small-flow closed-circulation cooling water pump 1;

[0169] 3) After the minimum flow cycle of the small-flow closed-loop cooling water pump 1 is established and the operation of the small-flow closed-loop cooling water pump tends to be stable, open the automatic shut-off valve 7-1 of the outlet of the small-flow closed-loop cooling water pump to the outlet main pipe of the large pump, and close the automatic shut-off valve 7-2 of the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the inlet branch pipe of the large pump, so as to connect the outlet of the auxiliary cooling water subsystem of the concentrated solar collector system to the outlet pipe 22-1 of the large pump, and then enter the cooling tower subsystem;

[0170] 4) After the small-flow closed-loop cooling water pump 1 is established to supply water to the concentrating and collecting subsystem, the large-flow closed-loop cooling water pump 2 is closed to complete the switch from the large-flow closed-loop cooling water pump to the small-flow closed-loop cooling water pump.

[0171] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps, characterized in that: It includes a first water pump subsystem, a second water pump subsystem, an auxiliary cooling water subsystem of a concentrated solar collector system, an auxiliary cooling water subsystem of a heat exchange system and an auxiliary cooling water subsystem of a steam turbine generator system. The flow rate of the first water pump subsystem is smaller than the flow rate of the second water pump subsystem. The outlet sides of the auxiliary cooling water subsystem of the concentrated solar collector system, the auxiliary cooling water subsystem of the heat exchange system and the auxiliary cooling water subsystem of the steam turbine generator system are respectively connected to the auxiliary cooling water outlet mother pipe, and a second shut-off valve is arranged on the connecting pipe between the outlet side of the auxiliary cooling water subsystem of the concentrated solar collector system and the auxiliary cooling water outlet mother pipe. The outlet sides of the first water pump subsystem and the second water pump subsystem are both connected to the second water pump outlet mother pipe, and a first shut-off valve is arranged on the connecting pipe between the first water pump subsystem and the second water pump outlet mother pipe.

2. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The water inlet sides of the auxiliary cooling water subsystem of the concentrated solar collector system, the auxiliary cooling water subsystem of the heat exchange system and the auxiliary cooling water subsystem of the steam turbine generator system are respectively connected to the auxiliary cooling water inlet main pipe; Or, the cooling water subsystem of the auxiliary machine of the concentrated solar collector system includes a plurality of parallel auxiliary machines of the concentrated solar collector system, and a manual valve is provided on the water inlet side and the water outlet side of each auxiliary machine of the concentrated solar collector system; Or, the water outlet side of the auxiliary cooling water subsystem of the concentrated solar collector system is connected to the water inlet side of the first water pump subsystem, and the water inlet side of the first water pump subsystem is also connected to a closed expansion water tank; Alternatively, the water inlet side of the auxiliary cooling water subsystem of the concentrated solar collector system is connected to the water outlet side of the first water pump subsystem, and the water inlet branch of the auxiliary cooling water subsystem of the concentrated solar collector system is arranged in parallel with the first water pump branch.

3. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The first water pump subsystem comprises a first water pump branch pipe and a first water pump outlet recirculation branch pipe; the first water pump branch pipe and the first water pump outlet recirculation branch pipe are arranged in parallel; the first water pump branch pipe is provided with a first water pump; the first water pump outlet recirculation branch pipe is provided with a first water pump outlet recirculation branch pipe valve; Or, the first water pump subsystem is arranged on the connecting pipeline between the water inlet side of the auxiliary cooling water subsystem of the concentrating solar collector system and the auxiliary cooling water inlet main pipe, the auxiliary cooling water subsystem of the concentrating solar collector system is arranged on the connecting pipeline between the water outlet side of the first water pump subsystem and the second water pump outlet main pipe, and the first shut-off valve is arranged between the water outlet side of the auxiliary cooling water subsystem of the concentrating solar collector system and the second water pump outlet main pipe.

4. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The second water pump subsystem comprises a second water pump branch pipe and a second water pump outlet recirculation branch pipe; the water inlets of the second water pump branch pipe and the second water pump outlet recirculation branch pipe are both connected to the auxiliary machine cooling water outlet main pipe, and the water outlets of the second water pump branch pipe and the second water pump outlet recirculation branch pipe are both connected to the second water pump outlet main pipe; the second water pump branch pipe is provided with a second water pump; the second water pump outlet recirculation branch pipe is provided with a second water pump outlet recirculation branch pipe valve; Alternatively, a cooling tower subsystem is arranged between the second water pump outlet main pipe and the auxiliary machine cooling water inlet main pipe; the cooling tower subsystem includes parallel cooling tower bypass branch pipes and cooling tower inlet and outlet water pipes; a cooling tower bypass valve and a cooling tower are respectively arranged on the cooling tower bypass branch pipe and the cooling tower inlet and outlet water pipes, and a cooling tower inlet valve and a cooling tower outlet valve are respectively arranged on the inlet side and outlet side of the cooling tower.

5. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The heat exchange system auxiliary machine cooling water subsystem comprises a plurality of parallel heat exchange system auxiliary machines, and a manual valve is arranged on the water inlet side and the water outlet side of each heat exchange system auxiliary machine.

6. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The auxiliary machine cooling water subsystem of the steam turbine power generation system comprises a plurality of parallel auxiliary machines of the steam turbine power generation system, and a manual valve is arranged on the water inlet side and the water outlet side of each auxiliary machine of the steam turbine power generation system.

7. The power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps according to claim 1 is characterized in that: The auxiliary machine cooling water outlet main pipe is connected to a closed expansion water tank, and a second water pump front constant pressure pipeline shut-off valve is provided on the connecting pipeline between the auxiliary machine cooling water outlet main pipe and the closed expansion water tank.

8. The control method of the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as described in any one of claims 1 to 7, characterized in that: include: Control the opening and closing of the first shut-off valve, the second shut-off valve, the cooling tower bypass valve, the cooling tower water inlet valve and the cooling tower water outlet valve, and the alternating operation of the first water pump subsystem and the second water pump subsystem.

9. The control method of the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as claimed in claim 8, characterized in that: include: When the solar collector system, heat exchange system and steam turbine power generation system are all in operation, close the cooling tower bypass valve, the shut-off valve on the inlet side of the small-flow closed-circulation cooling water pump, the shut-off valve on the outlet side of the small-flow closed-circulation cooling water pump, and the automatic shut-off valve from the outlet of the small-flow closed-circulation cooling water pump to the outlet main pipe of the large pump; open the cooling tower inlet valve, the cooling tower outlet valve, the shut-off valve on the inlet side of the large-flow closed-circulation cooling water pump, the shut-off valve on the outlet side of the large-flow closed-circulation cooling water pump, the automatic shut-off valve from the outlet of the auxiliary cooling water subsystem of the solar collector system to the inlet branch of the large pump, and the shut-off valve of the constant pressure pipeline in front of the large-flow closed-circulation cooling water pump; close the small-flow closed-circulation cooling water pump and open the large-flow closed-circulation cooling water pump.

10. The control method of the power generation auxiliary machine cooling system with isolated outlet sides of large and small water pumps as claimed in claim 8, characterized in that: include: When only the solar collector system is running, and the heat exchange system and the steam turbine power generation system are not running, close the cooling tower inlet valve, cooling tower outlet valve, large-flow closed-loop cooling water pump inlet side shut-off valve, large-flow closed-loop cooling water pump outlet side shut-off valve, and the automatic shut-off valve from the cooling water subsystem of the auxiliary equipment of the solar collector system to the inlet branch of the large pump; open the cooling tower bypass valve, the small-flow closed-loop cooling water pump inlet side shut-off valve, the small-flow closed-loop cooling water pump outlet side shut-off valve, and the small-flow closed-loop cooling water pump outlet to the large pump outlet main pipe automatic shut-off valve; close the large-flow closed-loop cooling water pump, and open the small-flow closed-loop cooling water pump.

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