Generator and open-close type cuttable cooling water system of auxiliary engine of generator

Abstract

The utility model relates to the technical field, and discloses a generator and an open-close type switchable cooling water system of a generator auxiliary machine, comprising a generator auxiliary machine cooling loop; an open circulation cooling circuit; the steam turbine condenser loop comprises a steam turbine condenser, a second cold water pipe and a second hot water pipe; the auxiliary machine cooling loop of the generator further comprises a third cold water pipe connected with the second cold water pipe, a third hot water pipe connected with the second hot water pipe, a second switching valve arranged on the third hot water pipe and a third cold water pipe connected with the third hot water pipe. A communicating pipe is arranged between the third hot water pipe and the third cold water pipe, and a third switching valve is arranged on the communicating pipe. The system can be automatically switched between an open-close type circulation mode and an open type circulation mode according to the water quality of an external water source or seasonal changes, the secondary heat exchange energy consumption is remarkably reduced, and meanwhile the cooling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator cooling technical field especially, it is a kind of open-close type cuttable cooling water system of generator and its generator auxiliary machine. BACKGROUND

[0002] The existing power plant generally adopts open-close type combined auxiliary machine circulating cooling water system, which couples heat by water-water heat exchanger between closed circulating cooling water (used for auxiliary equipment cooling) and open circulating cooling water (used for steam turbine condenser cooling). In such system, part of auxiliary equipment (such as condenser vacuum pump, generator air cooler, etc.) is directly connected to open circulating cooling water system, while most of the equipment still relies on closed circulating cooling water, forming a hybrid cooling architecture. However, this design has the following significant defects: such as insufficient energy efficiency and heat exchange efficiency: closed circulating cooling water system needs to rely on secondary heat exchange (exchange heat with open circulating cooling water through heat exchanger), resulting in heat loss in heat transfer process, and the overall heat exchange efficiency is low. In addition, the closed circulating system needs to be equipped with circulating water pump, water tank and other equipment to maintain stable pressure and flow, further increasing the system operation energy consumption. On the other hand, its water quality dynamic adaptability is also poor, such as the water source of open circulating cooling water (such as river water, seawater, etc.) is significantly affected by season and climate. For example, when the amount of rainwater increases in summer, the turbidity of the water source increases, and if it is directly used for cooling equipment, it may cause problems such as pipe blockage and scaling, so it needs to be switched to closed circulation to ensure system stability; when the turbidity of the water source decreases in winter, although open circulation can be directly used to improve the cooling efficiency, the existing system lacks a dynamic switching mechanism, and needs to rely on manual operation or fixed operation mode, which lacks flexibility. SUMMARY

[0003] The utility model aims at providing a kind of open-close type cuttable cooling water system of generator and its generator auxiliary machine, system can be switched between open-close type circulation mode and open type circulation mode according to external water source water quality or seasonal variation, significantly reduce secondary heat exchange energy consumption, while improve cooling efficiency.

[0004] To achieve the above purpose, the utility model provides an open-close type cuttable cooling water system of generator auxiliary machine, comprising:

[0005] Generator auxiliary machine cooling circuit, the generator auxiliary machine cooling circuit is provided with generator auxiliary machine and first heat exchanger;

[0006] Open circulating cooling circuit, the open circulating cooling circuit includes first cold water pipe and first hot water pipe connected with the first heat exchanger;

[0007] The steam turbine condenser loop comprises a steam turbine condenser, a second cold water pipe and a second hot water pipe, one end of the second cold water pipe and the second hot water pipe being connected to an external radiator away from the steam turbine condenser, and one end of the first cold water pipe and the first hot water pipe being connected to the second cold water pipe and the second hot water pipe away from the first heat exchanger respectively;

[0008] The generator auxiliary machine cooling loop further comprises a third cold water pipe connected to the second cold water pipe, the third cold water pipe being provided with a first switch valve, the generator auxiliary machine cooling loop further comprises a third hot water pipe connected to the second hot water pipe, the third hot water pipe being provided with a second switch valve, and a communication pipe is arranged between the third hot water pipe and the third cold water pipe, and the communication pipe is provided with a third switch valve.

[0009] Compared with the prior art, the open-closed type switchable cooling water system of the generator auxiliary machine has the following beneficial effects: during the cooling process of the generator auxiliary machine, the cooling water absorbs heat through the generator auxiliary machine, and then releases the heat to the open cycle cooling loop through the first heat exchanger, and the heat of the first heat exchanger is transmitted to the external radiator through the first cold water pipe and the first hot water pipe, the external radiator is further connected to the steam turbine condenser loop, the steam turbine condenser releases heat through the second cold water pipe and the second hot water pipe connected to the external radiator, and the first cold water pipe and the first hot water pipe are connected to the second cold water pipe and the second hot water pipe. The third hot water pipe and the third cold water pipe are connected between the generator auxiliary machine cooling loop and the steam turbine condenser loop, and the first switch valve and the second switch valve on the third hot water pipe and the third cold water pipe control the opening and closing of the third hot water pipe and the third cold water pipe, so that the whole system can be switched between open-closed combined operation and open operation, and the third switch valve is opened during open-closed combined operation and closed during open operation. By arranging the third cold water pipe, the third hot water pipe and the communication pipe connected to the steam turbine condenser loop, and configuring the first switch valve, the second switch valve and the third switch valve, the heat of the generator auxiliary machine cooling loop and the steam turbine condenser loop is collaboratively managed. In the open cycle mode, the cooling water forms a short circuit circulation through the communication pipe, and directly utilizes the high-efficiency heat dissipation capacity of the external water source. On the other hand, the system can automatically switch between the open-closed cycle mode and the open cycle mode according to the water quality (such as turbidity and temperature) of the external water source or seasonal changes. For example, when the turbidity is high in summer, the third switch valve is opened, the first switch valve and the second switch valve are closed, and the open-closed combined cycle is enabled to avoid blockage and fouling; when the turbidity is low in winter, the third switch valve is closed, the first switch valve and the second switch valve are opened, and the generator auxiliary machine cooling loop is directly connected to the open cycle cooling loop, thereby significantly reducing the secondary heat exchange energy consumption and improving the cooling efficiency.

[0010] The open-close type switchable cooling water system of the generator auxiliary machine, the first circulating cooling water pump is further arranged in the generator auxiliary machine cooling circuit.

[0011] The open-close type switchable cooling water system of the generator auxiliary machine, the second circulating cooling water pump is arranged on the second cold water pipe.

[0012] The open-close type switchable cooling water system of the generator auxiliary machine, the open type circulating cooling circuit is further connected with a condenser vacuum pump, and two ends of the condenser vacuum pump are connected with the first hot water pipe and the first cold water pipe respectively.

[0013] The open-close type switchable cooling water system of the generator auxiliary machine, the open type circulating cooling circuit is further connected with a condenser vacuum pump, and two ends of the condenser vacuum pump are connected with the first hot water pipe and the first cold water pipe respectively.

[0014] The open-close type switchable cooling water system of the generator auxiliary machine, the external radiator comprises a ventilation cooling tower.

[0015] The open-close type switchable cooling water system of the generator auxiliary machine further comprises a controller, a transmission module and a control module are arranged on the controller, the first switch valve, the second switch valve and the third switch valve are connected to the controller through the transmission module, and the control module controls opening and closing of the first switch valve, the second switch valve and the third switch valve.

[0016] The utility model further provides a kind of generator, comprising: auxiliary machine system, the auxiliary machine system is cooled by the open-close type switchable cooling water system of the generator auxiliary machine of any one of above embodiment.

[0017] Compared with the prior art, the on-off switchable cooling water system of the generator auxiliary machine has the beneficial effects that: the third cold water pipe, the third hot water pipe and the communication pipe which are communicated with the steam turbine condenser loop are arranged in the on-off switchable cooling water system of the generator auxiliary machine, and the first switch valve, the second switch valve and the third switch valve are arranged, so that the heat collaborative management of the generator auxiliary machine cooling loop and the steam turbine condenser loop is realized. In the open cycle mode, the cooling water forms a short circuit circulation through the communication pipe, and directly utilizes the high heat dissipation capacity of the external water source. On the other hand, the system can automatically switch between the on-off switchable cycle mode and the open cycle mode according to the water quality (such as turbidity and temperature) of the external water source or seasonal changes. For example, when the turbidity is high in summer, the third switch valve is opened, the first switch valve and the second switch valve are closed, and the on-off switchable cycle is started to avoid blockage and fouling. When the turbidity is low in winter, the third switch valve is closed, the first switch valve and the second switch valve are opened, and the generator auxiliary machine cooling loop is directly connected to the open cycle cooling loop, so that the secondary heat exchange energy consumption is significantly reduced, and the cooling efficiency is improved.

[0018] Additional aspects and advantages of the present application will be described in the following description, some of which will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structure schematic view of the on-off switchable cooling water system of the generator auxiliary machine of the embodiment of the present application;

[0020] In the figure, 1, generator auxiliary machine cooling loop; 11, generator auxiliary machine; 12, first heat exchanger; 13, third cold water pipe; 131, first switch valve; 14, third hot water pipe; 141, second switch valve; 15, communication pipe; 151, third switch valve; 16, first circulating cooling water pump; 2, open cycle cooling loop; 21, first cold water pipe; 22, first hot water pipe; 23, condenser vacuum pump; 24, generator air cooler; 3, steam turbine condenser loop; 31, steam turbine condenser; 32, second cold water pipe; 33, second hot water pipe; 34, external radiator; 35, second circulating cooling water pump. DETAILED DESCRIPTION

[0021] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0022] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] like Figure 1 As shown in the preferred embodiment of this utility model, an openable and closable switchable cooling water system for a generator auxiliary machine includes a generator auxiliary machine cooling circuit 1, an open-loop cooling circuit 2, and a turbine condenser circuit 3. The generator auxiliary machine cooling circuit 1 is equipped with a generator auxiliary machine 11 and a first heat exchanger 12. The open-loop cooling circuit 2 includes a first cold water pipe 21 and a first hot water pipe 22 connected to the first heat exchanger 12. The turbine condenser circuit 3 includes a turbine condenser 31, a second cold water pipe 32, and a second hot water pipe 33. The ends of the second cold water pipe 32 and the second hot water pipe 33 away from the turbine condenser 31 are connected to an external radiator 34. The ends of the first cold water pipe 21 and the first hot water pipe 22 away from the first heat exchanger 12 are respectively connected to the second cold water pipe 32 and the second hot water pipe 33.

[0026] The generator auxiliary machine 11 cooling circuit 1 also includes a third cold water pipe 13 connected to the second cold water pipe 32, and a first switching valve 131 is provided on the third cold water pipe 13. The generator auxiliary machine 11 cooling circuit 1 also includes a third hot water pipe 14 connected to the second hot water pipe 33, and a second switching valve 141 is provided on the third hot water pipe 14. A connecting pipe 15 is provided between the third hot water pipe 14 and the third cold water pipe 13, and a third switching valve 151 is provided on the connecting pipe 15.

[0027] During the cooling process of the generator auxiliary machine 11, the cooling water absorbs heat through the generator auxiliary machine 11, and then releases the heat to the open circulation cooling loop 2 through the first heat exchanger 12; the heat of the first heat exchanger 12 is transmitted to the external radiator 34 through the first cold water pipe 21 and the first hot water pipe 22; the external radiator 34 is also connected with the turbine condenser 31 loop 3; the turbine condenser 31 is connected with the external radiator 34 through the second cold water pipe 32 and the second hot water pipe 33 to release heat; the first cold water pipe 21 and the first hot water pipe 22 are connected with the second cold water pipe 32 and the second hot water pipe 33. The third hot water pipe 14 and the third cold water pipe 13 are connected between the generator auxiliary machine 11 cooling loop 1 and the turbine condenser 31 loop 3; the first switch valve 131 and the second switch valve 141 on the third cold water pipe 13 and the third hot water pipe 14 control the opening and closing of the third hot water pipe 14 and the third cold water pipe 13, so that the whole system can be switched between the open-closed combined operation and the open operation; the third switch valve 151 is opened when the open-closed combined operation is performed, and the first switch valve 131 and the second switch valve 141 are closed at this time; the third switch valve 151 is closed when the open operation is performed, and the first switch valve 131 and the second switch valve 141 are closed at this time. By arranging the third cold water pipe 13, the third hot water pipe 14 and the communication pipe 15 in communication with the turbine condenser 31 loop 3, and arranging the first switch valve 131, the second switch valve 141 and the third switch valve 151, the heat of the generator auxiliary machine 11 cooling loop 1 and the turbine condenser 31 loop 3 is cooperatively managed. In the open circulation mode, the cooling water forms a short circuit circulation through the communication pipe 15, and directly utilizes the high-efficiency heat dissipation capacity of the external water source; on the other hand, the system can automatically switch between the open-closed circulation mode and the open circulation mode according to the water quality (such as turbidity and temperature) of the external water source or seasonal changes. For example, when the turbidity is high in summer, the third switch valve 151 is opened, the first switch valve 131 and the second switch valve 141 are closed, and the open-closed combined circulation is enabled to avoid blockage and fouling; when the turbidity is low in winter, the third switch valve 151 is closed, the first switch valve 131 and the second switch valve 141 are opened, and the generator auxiliary machine 11 cooling loop 1 is directly connected to the open circulation cooling loop 2, which significantly reduces the secondary heat exchange energy consumption and improves the cooling efficiency.

[0028] In some embodiments of the utility model, the first circulating cooling water pump 16 is further arranged in the generator auxiliary machine cooling loop 1, and the first circulating cooling water pump 16 drives the closed circulation cooling water to circulate in the loop through active pressurization, so that the cooling medium has sufficient flow rate and pressure when flowing through the generator auxiliary machine 11 and the first heat exchanger 12, thereby improving the heat exchange efficiency.

[0029] In some embodiments of the utility model, second circulating cooling water pump 35 is arranged on second cold water pipe 32, second circulating cooling water pump 35 is used as the main drive unit of steam turbine condenser 31 loop 3, and through active pressurization, it ensures that open cycle cooling water (such as river water, seawater and other natural water sources) is efficiently circulated between external radiator 34 and steam turbine condenser 31, provides sufficient flow rate and pressure, and guarantees the heat dissipation requirement of the condenser.

[0030] In some embodiments of the utility model, the open cycle cooling circuit 2 is also connected with a condenser vacuum pump 23, the two ends of the condenser vacuum pump 23 are connected with the first cold water pipe 21 and the first hot water pipe 22 respectively, after the first cold water pipe 21 and the first hot water pipe 22 are connected, the vacuum pump can utilize the natural temperature difference of the open cycle cooling water, assist the condenser vacuum pump 23 to dissipate heat, reduce the heat load when the vacuum pump works, and reduce the additional cooling requirement caused by gas compression and temperature rise.

[0031] In some embodiments of the utility model, the open cycle cooling circuit 2 is also connected with a condenser vacuum pump 23, the two ends of the condenser vacuum pump 23 are connected with the first cold water pipe 21 and the first hot water pipe 22 respectively, after the first cold water pipe 21 and the first hot water pipe 22 are connected, the vacuum pump can utilize the natural temperature difference of the open cycle cooling water, assist the condenser vacuum pump 23 to dissipate heat, reduce the heat load when the vacuum pump works, and reduce the additional cooling requirement caused by gas compression and temperature rise.

[0032] In some embodiments of the utility model, the external radiator 34 includes a ventilation cooling tower, the ventilation cooling tower directly contacts water and air, utilizes the double mechanisms of evaporative heat dissipation and contact heat transfer to quickly reduce the circulating water temperature, cools the high-temperature return water to close to the ambient wet-bulb temperature, and meets the repeated utilization requirement of the open cycle cooling system for low-temperature water.

[0033] In some embodiments of the utility model, a controller is further included, a transmission module and a control module are arranged on the controller, the first switching valve 131, the second switching valve 141 and the third switching valve 151 are all connected to the controller through the transmission module, the control module controls the opening and closing of the first switching valve 131, the second switching valve 141 and the third switching valve 151, the transmission module serves as a communication hub, receives external instructions (such as remote operation commands or sensor feedback signals) through wired or wireless protocols (such as RS485 and CAN bus), and synchronously distributes control signals to the first, second and third switching valves 151, to ensure the timing consistency of multiple valve actions; the transmission module collects the state information (such as opening degree and pressure data) of the switching valve in real time, and provides a dynamic adjustment basis for the control module.

[0034] The utility model discloses a preferred embodiment still includes a generator, including auxiliary machine system, and auxiliary machine system carries out heat dissipation through the open and close type of the cooling water system of any one generator auxiliary machine 11 of above embodiment. Through setting up the third cold water pipe 13, third hot water pipe 14 and the communicating pipe 15 of the loop 3 intercommunication of steam turbine condenser 31 with the open and close type of the cooling water system of generator auxiliary machine 11, and the configuration first switching valve 131, second switching valve 141 and third switching valve 151, the heat collaborative management of generator auxiliary machine 11 cooling loop 1 and steam turbine condenser 31 loop 3 has been realized. In open cycle mode, cooling water forms short circuit circulation through the communicating pipe 15, directly utilizes the high efficient heat dissipation capacity of external water source, on the other hand, the system can according to external water source water quality (such as turbidity, temperature) or seasonal variation, in closed cycle mode (secondary cooling through first heat exchanger 12) and open cycle mode (directly utilizes external water source primary cooling) between automatic switching. For example, when high turbidity in summer, close third switching valve 151, enable closed cycle to avoid blockage and fouling, when low turbidity in winter, open third switching valve 151, directly connect generator auxiliary machine 11 cooling loop 1 into open cycle cooling loop 2, significantly reduce secondary heat exchange energy consumption, improve cooling efficiency at the same time.

[0035] The working process of the utility model is as follows: during the cooling process of the generator auxiliary machine 11, the cooling water releases heat through the generator auxiliary machine 11, and then releases the heat to the open cycle cooling loop 2 through the first heat exchanger 12. The heat of the first heat exchanger 12 is transmitted to the external radiator 34 through the first cold water pipe 21 and the first hot water pipe 22. The external radiator 34 is also connected to the loop 3 of the steam turbine condenser 31. The steam turbine condenser 31 is connected to the external radiator 34 through the second cold water pipe 32 and the second hot water pipe 33 for heat dissipation. The first cold water pipe 21 and the first hot water pipe 22 are connected to the second cold water pipe 32 and the second hot water pipe 33. The loop 1 of the generator auxiliary machine 11 and the loop 3 of the steam turbine condenser 31 are connected through the third hot water pipe 14 and the third cold water pipe 13. The first switching valve 131 and the second switching valve 141 on the third hot water pipe 14 and the third cold water pipe 13 control the opening and closing of the third hot water pipe 14 and the third cold water pipe 13, so that the whole system can be switched between open and close combined operation and open operation. The third switching valve 151 is opened during open and close combined operation, and the first switching valve 131 and the second switching valve 141 are closed at this time. The third switching valve 151 is closed during open operation, and the first switching valve 131 and the second switching valve 141 are closed at this time.

[0036] In summary, the utility model embodiment provides a kind of generator and the opening-closing type cooling water system of generator auxiliary machine thereof, it can be switched between open-closed type circulation mode and open type circulation mode according to external water source water quality (such as turbidity, temperature) or seasonal variation.Automatic switching is carried out.The first switch valve 131 and the second switch valve 141 are closed, and open-closed type combined circulation is enabled to avoid blockage and fouling.The third switch valve 151 is closed when turbidity is low, and the first switch valve 131 and the second switch valve 141 are opened.The generator auxiliary machine 11 cooling circuit 1 is directly connected to the open type circulation cooling circuit 2, which significantly reduces the energy consumption of secondary heat exchange, while improving the cooling efficiency.

[0037] The above is only the preferred embodiment of the utility model, and it should be pointed out that, for ordinary skilled person in the art, without departing from the technical principles of the utility model, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the utility model.

Claims

1. A switchable cooling water system for a generator auxiliary machine, characterized in that, include: A generator auxiliary cooling circuit is provided, wherein a generator auxiliary machine and a first heat exchanger are installed on the generator auxiliary cooling circuit; An open-loop cooling circuit, comprising a first cold water pipe and a first hot water pipe connected to the first heat exchanger; A steam turbine condenser circuit, comprising a steam turbine condenser, a second cold water pipe and a second hot water pipe, wherein the ends of the second cold water pipe and the second hot water pipe away from the steam turbine condenser are connected to an external radiator, and the ends of the first cold water pipe and the first hot water pipe away from the first heat exchanger are respectively connected to the second cold water pipe and the second hot water pipe. The generator auxiliary cooling circuit also includes a third cold water pipe connected to the second cold water pipe, and a first switching valve is provided on the third cold water pipe. The generator auxiliary cooling circuit also includes a third hot water pipe connected to the second hot water pipe, and a second switching valve is provided on the third hot water pipe. A connecting pipe is provided between the third hot water pipe and the third cold water pipe, and a third switching valve is provided on the connecting pipe.

2. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: The generator auxiliary cooling circuit is also equipped with a first circulating cooling water pump.

3. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: A second circulating cooling water pump is installed on the second cold water pipe.

4. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: The open-loop cooling circuit is also connected to a condenser vacuum pump, and the two ends of the condenser vacuum pump are respectively connected to the first hot water pipe and the first cold water pipe.

5. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: The open-loop cooling circuit is also connected to a generator air cooler, and the two ends of the generator air cooler are respectively connected to the first hot water pipe and the first cold water pipe.

6. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: The external radiator includes a ventilation cooling tower.

7. The switchable cooling water system for generator auxiliary equipment according to claim 1, characterized in that: It also includes a controller, which is equipped with a transmission module and a control module. The first switching valve, the second switching valve and the third switching valve are all connected to the controller through the transmission module. The control module controls the opening and closing of the first switching valve, the second switching valve and the third switching valve.

8. A generator, characterized in that, include: An auxiliary system, wherein the auxiliary system dissipates heat through an openable and switchable cooling water system of the generator auxiliary as described in any one of claims 1-7.

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