JP4131518B2 - Cooling system for generator bearings for hydropower plants - Google Patents

Cooling system for generator bearings for hydropower plants Download PDF

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JP4131518B2
JP4131518B2 JP2006084715A JP2006084715A JP4131518B2 JP 4131518 B2 JP4131518 B2 JP 4131518B2 JP 2006084715 A JP2006084715 A JP 2006084715A JP 2006084715 A JP2006084715 A JP 2006084715A JP 4131518 B2 JP4131518 B2 JP 4131518B2
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浩二 伊藤
満 小松
昭治 菊地
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Description

本発明は水力発電所用発電機軸受の冷却システムに関する。   The present invention relates to a cooling system for a generator bearing for a hydropower plant.

従来の一般的な水力発電所用発電機軸受の冷却システムでは、水力発電所用発電機軸受の冷却に河川水を利用している。しかし、この冷却システムでは、台風、豪雨といった異常気象により河川水に多くの泥、砂を含んだ場合、その河川水の流路回路部品である水ポンプ、流量計等の機器の故障が生じ易く、面倒なメンテナンスを必要としていた。これらの故障による流路の詰まりが生ずると、冷却能力が低下してタービン軸受の冷却不足によるタービン軸受の信頼性が低下するおそれがあった。   Conventional cooling systems for general hydroelectric power plant bearings use river water for cooling hydrodynamic power plant generator bearings. However, in this cooling system, when the river water contains a lot of mud and sand due to abnormal weather such as typhoon and heavy rain, it is easy for the equipment such as water pumps and flow meters that are the flow circuit parts of the river to fail. Needed troublesome maintenance. When the clogging of the flow path due to these failures occurs, the cooling capacity is lowered, and there is a risk that the reliability of the turbine bearing is lowered due to insufficient cooling of the turbine bearing.

そこで、特開昭60−13448号公報(特許文献1)に示された水力発電装置が案出されている。この水力発電装置は、円錐状支持部とステーベーンに冷却水循環孔を設け、これに冷却水入口パイプ、冷却水出口パイプを接続し、冷却水入口パイプと冷却水出口パイプとの間に第1ポンプ及び二次冷却水で冷却される熱交換器を配設し、冷却水を筒状枠内と熱交換器に循環させるようになっている。これによって、筒状枠内の冷却水が発電機冷却により昇温しても、第1ポンプにより熱交換器を介して循環することにより、発電機の冷却を継続できるとしている。なお、この水力発電装置は、下流側ステーベーンから下流側円錐状支持部を通して、下流側の軸受の上流側部分に開口する冷却水補給孔を設け、これに冷却水補給パイプを接続し、第2ポンプにより清水タンクから冷却水を補給させ、筒状枠内に外部流水が混入しないようにしている。   In view of this, a hydraulic power generation apparatus disclosed in Japanese Patent Laid-Open No. 60-13448 (Patent Document 1) has been devised. In this hydroelectric power generation device, a cooling water circulation hole is provided in the conical support portion and the stay vane, and a cooling water inlet pipe and a cooling water outlet pipe are connected thereto, and the first pump is provided between the cooling water inlet pipe and the cooling water outlet pipe. And the heat exchanger cooled with secondary cooling water is arrange | positioned, and a cooling water is circulated in a cylindrical frame and a heat exchanger. Thereby, even if the cooling water in the cylindrical frame is heated by the generator cooling, the generator can be continuously cooled by being circulated through the heat exchanger by the first pump. The hydroelectric generator is provided with a cooling water supply hole that opens from the downstream stay vane through the downstream conical support portion to the upstream portion of the downstream bearing, and a cooling water supply pipe is connected to the cooling water supply pipe. Cooling water is replenished from the fresh water tank by a pump so that external flowing water does not enter the cylindrical frame.

特開昭60−13448号公報JP 60-13448 A

上述した特許文献1の水力発電装置では、熱交換器で冷却水を単に冷却するのみであるため、例えば発電機の負荷が増大するなどして発電機が異常に温度上昇した場合に、冷却水を循環するようにしたことにより、循環する冷却水の温度が徐々に上昇して発電機軸受の信頼性を確保することが難しくなるという課題があった。また、冷却水の水温は年間を通して大きく異なるため、冷却水の温度を年間を通して所定温度に維持する冷却システムが必要であった。   In the hydroelectric generator of Patent Document 1 described above, the cooling water is simply cooled by the heat exchanger. Therefore, when the temperature of the generator rises abnormally due to an increase in the load of the generator, for example, the cooling water As a result, the temperature of the circulating cooling water gradually rises and it is difficult to ensure the reliability of the generator bearing. Further, since the temperature of the cooling water varies greatly throughout the year, a cooling system that maintains the temperature of the cooling water at a predetermined temperature throughout the year is required.

本発明の目的は、保守が容易で、高い信頼性を確保できる水力発電所用発電機軸受の冷却システムを得ることにある。   An object of the present invention is to provide a cooling system for a generator bearing for a hydropower station that is easy to maintain and can ensure high reliability.

前述の目的を達成するために、本発明の水力発電所用発電機軸受の冷却システムは、タービン軸受冷却部に清水である冷却水を循環して供給する循環路と、前記循環路の中間部に設けた水熱交換器と、前記循環路の冷却水を循環させる水ポンプと、前記水熱交換器を冷却する冷媒熱交換器を有する冷却水冷却装置と、前記循環路を循環する冷却水の温度を検出する温度センサと、前記温度センサで検出した冷却水の温度に基づいて前記冷却水冷却装置及び前記水ポンプの運転を制御する制御装置と、前記水熱交換器と前記タービン軸受冷却部とを結ぶ前記循環路の往路管及び復路管の中間部に介在され、循環する冷却水の一部を貯留するクッションタンクを備え、前記冷却水冷却装置は、放熱用熱交換器、圧縮機、膨張弁などから構成される冷凍サイクル、前記放熱用熱交換器に通風する送風機を備え、前記水ポンプは、前記クッションタンクから前記水熱交換器に至る復路管に設けた第1水ポンプと、前記クッションタンクから前記タービン軸受冷却部に至る往路管に設けた第2水ポンプとを備え、前記温度センサは、前記水熱交換器の入口側の冷却水の温度を検出する第1温度センサと、前記水熱交換器の出口側の冷却水の温度を検出する第2温度センサとを備え、前記制御装置は、前記第1温度センサの検出温度に基づいて前記冷却水冷却装置の運転をオンオフ制御する機能と、前記第2温度センサの検出温度が所定温度以下の場合に前記冷却水冷却装置の運転をオフ制御する機能とを備えている構成としたものである。

In order to achieve the above-described object, a cooling system for a generator bearing for a hydroelectric power plant according to the present invention includes a circulation path that circulates and supplies cooling water that is fresh water to a turbine bearing cooling section, and an intermediate section of the circulation path. A provided water heat exchanger, a water pump for circulating cooling water in the circulation path, a cooling water cooling device having a refrigerant heat exchanger for cooling the water heat exchanger, and cooling water circulating in the circulation path A temperature sensor for detecting temperature, a control device for controlling the operation of the cooling water cooling device and the water pump based on the temperature of the cooling water detected by the temperature sensor, the water heat exchanger, and the turbine bearing cooling unit It is interposed in the middle of the outward pipe and return pipe of the circulation path connecting the door, and a cushion tank for storing a part of the cooling water circulating the cooling water cooling system, the heat dissipation heat exchanger, the compressor Consists of expansion valves, etc. Refrigeration cycle, comprising a blower for ventilating the heat radiating heat exchanger, the water pump, a first water pump provided in the return pipe leading to the water heat exchanger from the cushion tank, the turbine bearings from the cushion tank A second water pump provided in the forward pipe leading to the cooling unit, wherein the temperature sensor detects a temperature of the cooling water on the inlet side of the water heat exchanger, and the water heat exchanger A second temperature sensor that detects the temperature of the cooling water on the outlet side, and the control device performs on / off control of the operation of the cooling water cooling device based on the temperature detected by the first temperature sensor; the temperature detected by the second temperature sensor is obtained by the configuration and a function of off control the operation of the cooling water cooling system when less than a predetermined temperature.

本発明の水力発電所用発電機軸受の冷却システムによれば、保守が容易で、高い信頼性を確保できる。   According to the cooling system for a generator bearing for a hydroelectric power plant of the present invention, maintenance is easy and high reliability can be ensured.

以下、本発明の一実施形態の水力発電所用発電機軸受の冷却システムについて図1及び図2を用いて説明する。図1は本発明の一実施形態の水力発電所用発電機軸受の冷却システム20の構成図、図2は図1の冷却システム20の制御構成図である。   Hereinafter, a cooling system for a generator bearing for a hydropower station according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a configuration diagram of a cooling system 20 for a hydroelectric power plant generator bearing according to an embodiment of the present invention, and FIG. 2 is a control configuration diagram of the cooling system 20 of FIG.

本実施形態の水力発電所用発電機軸受の冷却システム20は、タービン軸受冷却部3に清水である冷却水を循環して供給する循環路11と、循環路の中間部に設けた水熱交換器12と、循環路11の冷却水を循環させる水ポンプ5、6と、循環路11の中間部に介在するクッションタンク2と、水熱交換器12を冷却する冷媒熱交換器を有する冷却水冷却装置1と、循環路11を循環する冷却水の温度を検出する温度センサ7〜10と、温度センサ7〜10で検出した冷却水の温度に基づいて水ポンプ5〜6及び冷却水冷却装置1の運転を制御する制御装置13とを備えて構成されている。   A cooling system 20 for a hydroelectric power plant generator bearing according to this embodiment includes a circulation path 11 that circulates and supplies cooling water, which is fresh water, to the turbine bearing cooling section 3, and a water heat exchanger provided at an intermediate portion of the circulation path. 12, water pumps 5 and 6 for circulating cooling water in the circulation path 11, a cushion tank 2 interposed in the middle of the circulation path 11, and cooling water cooling having a refrigerant heat exchanger for cooling the water heat exchanger 12 The water pump 5-6 and the cooling water cooling device 1 based on the temperature of the cooling water detected by the apparatus 1, the temperature sensors 7-10 which detect the temperature of the cooling water circulating through the circulation path 11, and the temperature sensors 7-10. And a control device 13 for controlling the operation.

タービン軸受冷却部3は、タービン軸4を軸支する軸受を冷却する部分で構成され、冷却水を供給して軸受を水潤滑するようになっている。循環路11は、水熱交換器12からタービン軸受冷却部3に冷却水を供給する往路管11aと、タービン軸受冷却部3から水熱交換器12に冷却水を戻す復路管11bとから構成されている。   The turbine bearing cooling unit 3 is configured by a portion that cools the bearing that supports the turbine shaft 4, and supplies cooling water to water-lubricate the bearing. The circulation path 11 includes an outward pipe 11 a that supplies cooling water from the water heat exchanger 12 to the turbine bearing cooling section 3, and a return pipe 11 b that returns cooling water from the turbine bearing cooling section 3 to the water heat exchanger 12. ing.

冷却水冷却装置1は、圧縮機14(図2参照)、放熱用熱交換器、膨張弁、水冷却装置などからなる冷凍サイクル、放熱用熱交換器に通風する送風機15(図2参照)とを備えて構成されている。この冷却水冷却装置1は、水熱交換器12と、これを冷却する冷媒熱交換器とからなっている。ここで、水冷却装置をステンレス製プレート式熱交換器で構成することにより、循環路11に赤水が発生することを防止できる。   The cooling water cooling device 1 includes a compressor 14 (see FIG. 2), a refrigeration cycle including a heat radiating heat exchanger, an expansion valve, a water cooling device, etc., and a blower 15 (see FIG. 2) that ventilates the heat radiating heat exchanger. It is configured with. The cooling water cooling device 1 includes a water heat exchanger 12 and a refrigerant heat exchanger that cools the water heat exchanger 12. Here, it can prevent that red water generate | occur | produces in the circulation path 11 by comprising a water-cooling apparatus with a stainless steel plate type heat exchanger.

クッションタンク2は、循環する冷却水の一部を所定量だけ貯留して冷却水の循環量の増減に対応するためのもの、換言すれば、最低保有水量を確保し安定した水温制御をするためのものである。クッションタンク2は、水熱交換器12とタービン軸受冷却部3とを結ぶ循環路11の往路管11a及び復路管11bの中間部に介在するように設置されている。   The cushion tank 2 is for storing a predetermined amount of circulating cooling water to cope with an increase / decrease in the circulating amount of cooling water, in other words, for securing a minimum retained water amount and performing stable water temperature control. belongs to. The cushion tank 2 is installed so as to be interposed between the forward pipe 11a and the return pipe 11b of the circulation path 11 connecting the water heat exchanger 12 and the turbine bearing cooling section 3.

水ポンプ5〜6は、クッションタンク2から水熱交換器12に至る復路管11bに設けた第1水ポンプ5と、クッションタンク2からタービン軸受冷却部3に至る往路管11aに設けた第2水ポンプ6とを備えて構成されている。   The water pumps 5 to 6 are a first water pump 5 provided in the return pipe 11 b extending from the cushion tank 2 to the water heat exchanger 12, and a second water pump provided in the outgoing pipe 11 a extending from the cushion tank 2 to the turbine bearing cooling unit 3. A water pump 6 is provided.

温度センサ7〜10は、水熱交換器12の入口側の冷却水の温度を検出する第1温度センサ7と、水熱交換器12の出口側の冷却水の温度を検出する第2温度センサ8と、クッションタンク2の入口側の温度を検出する第3温度センサ9と、クッションタンク2の出口側の温度を検出する第4温度センサ10とを備えて構成されている。   The temperature sensors 7 to 10 are a first temperature sensor 7 that detects the temperature of the cooling water on the inlet side of the water heat exchanger 12 and a second temperature sensor that detects the temperature of the cooling water on the outlet side of the water heat exchanger 12. 8, a third temperature sensor 9 that detects the temperature on the inlet side of the cushion tank 2, and a fourth temperature sensor 10 that detects the temperature on the outlet side of the cushion tank 2.

制御装置13は、第1温度センサ7の検出温度に基づいて冷却水冷却装置1の運転をオンオフ制御する機能と、第2温度センサ8の検出温度が所定温度以下の場合に冷却水冷却装置1の運転をオフ制御する機能と、第3温度センサ9の検出温度に基づいて冷却水冷却装置1の運転をオンオフ制御する機能と、第温度センサ10の検出温度が所定温度以下の場合に第2水ポンプ6の運転をオフ制御する機能とを備えている。
The control device 13 controls the operation of the cooling water cooling device 1 on and off based on the temperature detected by the first temperature sensor 7, and the cooling water cooling device 1 when the temperature detected by the second temperature sensor 8 is equal to or lower than a predetermined temperature. A function to turn off the operation of the cooling water, a function to turn on and off the operation of the cooling water cooling device 1 based on the temperature detected by the third temperature sensor 9, and a case where the temperature detected by the fourth temperature sensor 10 is equal to or lower than a predetermined temperature. And a function of turning off the operation of the two-water pump 6.

かかる構成の冷却システム20において、冷却水は、冷却水冷却装置1により供給され、クッションタンク2内に所定温度で貯留される。その貯留されたクッションタンク2内の冷却水は、タービン軸受冷却部3に供給されてその冷却を行う。タービン軸受冷却部3を冷却後の冷却水はクッションタンク2内に戻される。クッションタンク2内の温度が上昇すれば、冷却水冷却装置1によりクッションタンク2内の冷却水が所定温度になるよう運転される。冷却水は、第1ポンプ5及び第2ポンプ6により、冷却水冷却装置1とクッションタンク2とタービン軸受冷却部3と閉循環するシステム構成とされ、この循環路11は閉じた構成とされているので、不純物が入りにくく、水質管理も容易となり、保守が容易になることから費用の削減も図れる。   In the cooling system 20 having such a configuration, the cooling water is supplied by the cooling water cooling device 1 and stored in the cushion tank 2 at a predetermined temperature. The stored cooling water in the cushion tank 2 is supplied to the turbine bearing cooling unit 3 for cooling. The cooling water after cooling the turbine bearing cooling unit 3 is returned to the cushion tank 2. When the temperature in the cushion tank 2 rises, the cooling water cooling device 1 is operated so that the cooling water in the cushion tank 2 reaches a predetermined temperature. The cooling water has a system configuration in which the cooling water cooling device 1, the cushion tank 2, and the turbine bearing cooling unit 3 are closed and circulated by the first pump 5 and the second pump 6, and the circulation path 11 is closed. Therefore, it is difficult for impurities to enter, water quality management becomes easy, and maintenance becomes easy, so the cost can be reduced.

本実施形態によれば、冷却水が清水であり、ポンプ、流量計等の水回路部品の故障が無く、信頼性が高い。これによって、保守が容易で、費用削減を図ることができる。また、循環路が閉回路であり、不純物が入りにくく、水質管理が容易である。これによって、保守が容易で、費用の削減を図ることができる。さらには、タービン軸受冷却部3への冷却水温度を安定して供給できるため、年間を通じて安定したタービン軸受冷却部の冷却が可能となる。   According to this embodiment, the cooling water is fresh water, and there is no failure of water circuit components such as a pump and a flow meter, and the reliability is high. As a result, maintenance is easy and cost reduction can be achieved. Moreover, the circulation path is a closed circuit, impurities are difficult to enter, and water quality management is easy. As a result, maintenance is easy and costs can be reduced. Furthermore, since the cooling water temperature to the turbine bearing cooling unit 3 can be stably supplied, the turbine bearing cooling unit can be stably cooled throughout the year.

なお、上記冷却システムにおいて、冷凍サイクルの圧縮機としてインバータを使用して回転数制御するなど、冷却能力の容量制御を有する構成にすることにより、冷却水冷却装置1の出口の冷却水温度を一定水温に制御するようにすれば、クッションタンク2を廃止することも可能となり、システムの簡素化を図れる。   In the above cooling system, the cooling water temperature at the outlet of the cooling water cooling device 1 is kept constant by adopting a configuration having capacity control of cooling capacity, such as controlling the number of revolutions using an inverter as a compressor of the refrigeration cycle. If the water temperature is controlled, the cushion tank 2 can be eliminated, and the system can be simplified.

本発明の一実施形態の水力発電所用発電機軸受の冷却システムの構成図である。It is a block diagram of the cooling system of the generator bearing for hydropower stations of one Embodiment of this invention. 図1の冷却システムの制御構成図である。It is a control block diagram of the cooling system of FIG.

符号の説明Explanation of symbols

1…冷却水冷却装置、2…クッションタンク、3…タービン軸受冷却部、4…タービン軸、5…第1ポンプ(冷却装置用水ポンプ)、6…第2ポンプ(タービン軸受冷却用水ポンプ)、7…第1温度センサ、8…第2温度センサ、9…第3温度センサ、10…第4温度センサ、11…循環路、12…水熱交換器、20…水力発電所用発電機軸受の冷却システム。   DESCRIPTION OF SYMBOLS 1 ... Cooling water cooling device, 2 ... Cushion tank, 3 ... Turbine bearing cooling part, 4 ... Turbine shaft, 5 ... 1st pump (water pump for cooling devices), 6 ... 2nd pump (water pump for turbine bearing cooling), 7 DESCRIPTION OF SYMBOLS 1st temperature sensor, 8 ... 2nd temperature sensor, 9 ... 3rd temperature sensor, 10 ... 4th temperature sensor, 11 ... Circulation path, 12 ... Hydrothermal exchanger, 20 ... Cooling system of generator bearing for hydroelectric power plant .

Claims (1)

タービン軸受冷却部に清水である冷却水を循環して供給する循環路と、
前記循環路の中間部に設けた水熱交換器と、
前記循環路の冷却水を循環させる水ポンプと、
前記水熱交換器を冷却する冷媒熱交換器を有する冷却水冷却装置と、
前記循環路を循環する冷却水の温度を検出する温度センサと、
前記温度センサで検出した冷却水の温度に基づいて前記冷却水冷却装置及び前記水ポンプの運転を制御する制御装置と、
前記水熱交換器と前記タービン軸受冷却部とを結ぶ前記循環路の往路管及び復路管の中間部に介在され、循環する冷却水の一部を貯留するクッションタンクを備え、
前記冷却水冷却装置は、放熱用熱交換器、圧縮機、膨張弁などから構成される冷凍サイクル、前記放熱用熱交換器に通風する送風機を備え、
前記水ポンプは、前記クッションタンクから前記水熱交換器に至る復路管に設けた第1水ポンプと、前記クッションタンクから前記タービン軸受冷却部に至る往路管に設けた第2水ポンプとを備え、
前記温度センサは、前記水熱交換器の入口側の冷却水の温度を検出する第1温度センサと、前記水熱交換器の出口側の冷却水の温度を検出する第2温度センサとを備え、
前記制御装置は、前記第1温度センサの検出温度に基づいて前記冷却水冷却装置の運転をオンオフ制御する機能と、前記第2温度センサの検出温度が所定温度以下の場合に前記冷却水冷却装置の運転をオフ制御する機能とを備えている水力発電所用発電機軸受の冷却システム。
A circulation path for circulating and supplying cooling water, which is fresh water, to the turbine bearing cooling section;
A water heat exchanger provided in an intermediate portion of the circulation path;
A water pump for circulating cooling water in the circulation path;
A cooling water cooling device having a refrigerant heat exchanger for cooling the water heat exchanger;
A temperature sensor for detecting the temperature of cooling water circulating in the circulation path;
A control device for controlling the operation of the cooling water cooling device and the water pump based on the temperature of the cooling water detected by the temperature sensor;
Is interposed in the middle of the outward pipe and return pipe of the circulation path connecting the said water heat exchanger wherein the turbine bearing cooling section, and a cushion tank for storing a part of the cooling water circulating,
The cooling water cooling device includes a refrigeration cycle including a heat exchanger for heat dissipation, a compressor, an expansion valve, and the like, a blower that ventilates the heat exchanger for heat dissipation,
The water pump includes a first water pump provided in a return pipe extending from the cushion tank to the water heat exchanger, and a second water pump provided in an outgoing pipe extending from the cushion tank to the turbine bearing cooling unit. ,
The temperature sensor comprises a first temperature sensor for detecting the temperature of the cooling water inlet side of the water heat exchanger, a second temperature sensor for detecting the temperature of the cooling water outlet side of the water heat exchanger ,
The control device has a function of on / off controlling the operation of the cooling water cooling device based on the temperature detected by the first temperature sensor, and the cooling water cooling device when the temperature detected by the second temperature sensor is equal to or lower than a predetermined temperature. hydroelectric power plant generator bearing cooling system that has a function of controlling off operation.
JP2006084715A 2006-03-27 2006-03-27 Cooling system for generator bearings for hydropower plants Expired - Fee Related JP4131518B2 (en)

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