JP2010077856A - Emergency diesel generator facility and its operation method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an emergency diesel generator facility capable of shortening a starting period. <P>SOLUTION: This emergency diesel generator facility 1 includes a diesel engine 2 and a generator 13. When currents from a house power source and an external power source are cut off, compressed air in an air storage tank 19 is supplied into a cylinder 3 to start the diesel engine 2. A lubricating oil supply pump 39 is driven by supply of the compressed air and supplies lubricating oil in a lubricating oil tank 30 to bearings 11, 12, 16, 17. The bearings 11, 12 support a crankshaft 10 rotated by reciprocation of a piston 6 in the cylinder 3 of the diesel engine 2, and the bearings 16, 17 support a rotor 14 of the generator 13 connected to the crankshaft 10. An air-driven generator 48 is driven by the compressed air and generates electric power. This electric power is supplied to an electric heater 52 of a lubricating oil heater 40 and heats lubricating oil supplied to each of bearings 11, 12, 16, 17. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an emergency diesel power generation facility and an operation method of the emergency diesel power generation facility, and more particularly to an emergency diesel power generation facility suitable for application to a nuclear power plant and an operation method of the emergency diesel power generation facility.

  The nuclear power plant, which is a power plant, is equipped with an emergency diesel power generation facility that is used as an emergency power source in the event of a power outage when the power from this nuclear power plant (internal power source) and the power from other power plants (external power source) are interrupted. ing. This emergency diesel power generation facility generates power during the power outage and supplies the power to the nuclear power plant. An example of an emergency diesel power generation facility is described in Japanese Patent Application Laid-Open No. 2007-92640.

  An emergency diesel power generation facility described in Japanese Patent Application Laid-Open No. 2007-92640 has a diesel engine and a generator, and the diesel engine and the generator are connected by a crankshaft supported by a bearing. When the nuclear power plant is operating and generating electric power, the emergency diesel power generation facility is in a standby state because it does not need to generate electric power. Even in this standby state, the emergency diesel power generation facility drives the lubricating oil priming pump to supply the lubricating oil to the bearings in order to shorten the start-up period of the diesel engine during a power failure. The lubricating oil priming pump is driven by an on-site power source. When the operation of the nuclear power plant is stopped and the on-site power source cannot be used, the lubricating oil priming pump is driven by an external power source.

  The emergency diesel power generation facility is driven when the in-house power supply is interrupted, but includes an air storage tank that stores compressed air to assist in starting the diesel engine. When the in-house power supply fails, the compressed air in the air storage tank is supplied into the cylinder of the diesel engine, and the piston is operated by the expansion force of the compressed air. Fuel oil is supplied into the cylinder, ignition begins, and the diesel engine starts. At this time, if the external power supply also fails, the lubricating oil priming pump is not driven and the lubricating oil cannot be supplied to the bearing.

  In order to avoid stopping the supply of lubricating oil to the bearing, the emergency diesel power generation facility has a lubricating oil supply pump that is driven using compressed air in the air storage tank. When the on-site power supply fails to drive the emergency diesel power generation facility, when the external power supply is in a power outage state, the compressed oil in the air storage tank is supplied to the lubricating oil supply pump to drive the lubricating oil supply pump, Supply lubricating oil to the bearing. The structure of this lubricating oil supply pump is shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2007-92640.

JP 2007-92640 A

  The lubricating oil supplied to the bearing needs to heat the emergency diesel power generation facility even in the standby state in order to shorten the starting time of the diesel engine. For this reason, in the standby state, it has been proposed to install an electric heater connected to the in-house power supply (or external power supply) and to heat the lubricating oil by this electric heater.

  The emergency diesel power generation facility described in Japanese Patent Application Laid-Open No. 2007-92640 does not include a heating device for lubricating oil supplied to the bearing. It is conceivable to install the electric heater in the lubricating oil supply pipe. However, even in this case, when the on-site power supply is interrupted and the emergency diesel power generation equipment is driven, and the external power supply is in a power failure state, the lubrication supplied to the bearing by the lubricating oil supply pump driven by compressed air The oil temperature falls below the set temperature. For this reason, the time required for starting the diesel engine becomes longer.

  An object of the present invention is to provide an emergency diesel power generation facility and an operation method of the emergency diesel power generation facility that can further shorten the start-up period.

  A feature of the present invention that achieves the above-described object is that a diesel engine, a first generator having a rotor coupled to a rotating shaft of the diesel engine, a starting device that starts the diesel engine using compressed air, and its rotation A lubricating oil supply device having a first lubricating oil supply pump that supplies a lubricating oil to a first bearing that supports a shaft and a second bearing that supports a rotor, and that is driven by rotation of the rotating shaft to boost the lubricating oil; When starting a diesel engine, it is driven by compressed air, and is driven by compressed air when starting the diesel engine, and a second lubricating oil supply pump that pressurizes the lubricating oil supplied to the first and second bearings. And a heating device that supplies the electric power generated by the second generator and heats the lubricating oil supplied to the first and second bearings by the second lubricating oil supply pump. A.

  Since the 2nd generator driven by compressed air is provided, when an in-house power supply and an external power supply fail, it can generate electric power with this 2nd generator. The electric power generated by this power generation is supplied to the heating device, and the lubricating oil supplied to the first and second bearings is heated by the heating device. Since the second lubricating oil supply pump driven by the compressed air is installed, the lubricating oil heated by the heating device at the time of a power failure of the in-house power supply and the external power supply is The second bearing can be supplied. For this reason, the diesel engine can be started earlier, and the start-up period of the emergency diesel power generation facility can be further shortened.

  According to the present invention, the start-up period of the emergency diesel power generation facility can be further shortened.

  An emergency diesel power generation facility according to a preferred embodiment of the present invention will be described with reference to FIG. The emergency diesel power generation facility 1 of the present embodiment includes a diesel engine 2, a generator (first generator) 13, a starting air system (starting device) 18, a fuel oil system (fuel oil supply device) 21, and a cooling water system (cooling). A water supply device) 24, a lubricating oil system (lubricating oil supply device) 29, and a start assist device 37 are provided, and are provided in a boiling water nuclear power plant that is a nuclear power plant.

  The diesel engine 2 includes a cylinder 3, a piston 6, a piston rod 7 and a crankshaft 10. The cylinder 3 has a cylinder cooling chamber 4 on the inlet side and a cylinder cooling chamber 5 on the outlet side. A piston 6 disposed in the cylinder 3 is connected to a piston rod 7, and the piston rod 7 is connected to a crankshaft 10 supported by bearings 11 and 12. An intake pipe 8 and an exhaust pipe 9 are further connected to the cylinder 3.

  The generator 13 includes a rotor 14 and a stator 15. The rotor 14 is supported by bearings 16 and 17 and is connected to the crankshaft 10. The starting air system 18 has an air storage tank 19 in which compressed air is stored. The air storage tank 19 is connected to the cylinder 3 by an air pipe 20 provided with an on-off valve 63. The fuel oil system 21 has a fuel tank 22 that stores fuel oil. The fuel tank 22 is connected to the cylinder 3 by a fuel pipe 23 provided with an on-off valve 62. The fuel tank 22 is arranged at a position higher than the cylinder 3 so that the fuel oil in the fuel tank 22 can be supplied into the cylinder 3 by gravity.

  The cooling water system 24 has a fresh water tank 25 and a fresh water pump 26 filled with fresh water. The fresh water tank 25 is provided with a cooler 60 that is a heat transfer tube through which cold water flows. A fresh water supply pipe 27 connected to the fresh water tank 25 is connected to the cylinder cooling chamber 4. A fresh water pump 26 is provided in the fresh water supply pipe 27. A fresh water return pipe 28 connected to the cylinder cooling chamber 5 connected to the cylinder cooling chamber 4 is connected to the fresh water tank 25. The fresh water pump 26 is connected to the crankshaft 10 and is rotated by the rotation of the crankshaft 10.

  The lubricating oil system 29 includes a lubricating oil tank 30, a lubricating oil pump (first lubricating oil supply pump) 31, a cooler 32, and a check valve 33. A lubricating oil supply pipe 34 connects the lubricating oil tank 30 and the cooler 32. A lubricating oil pump 31 is provided in the lubricating oil supply pipe 34. A lubricating oil supply pipe 35 connected to the cooler 32 is connected to bearings 11 and 12 that support the crankshaft 10 and bearings 16 and 17 that support the rotor 14. A check valve 33 is provided in the lubricating oil supply pipe 35. A lubricating oil return pipe 36 connected to the bearings 11, 12, 16, and 17 is connected to the lubricating oil tank 30. The lubricating oil pump 31 is also connected to the crankshaft 10 and is rotated by the rotation of the crankshaft 10.

  The start assist device 37 includes a lubricant assist device 38 and an air-driven generator (second generator) 48. The lubricating oil auxiliary device 38 includes a lubricating oil heater 40 in which an electric heater 52 is installed, a lubricating oil supply pump (second lubricating oil supply pump) 39, and a check valve 41. The lubricating oil supply pump 39 has the configuration shown in FIG. 2 of Japanese Patent Application Laid-Open No. 2007-92640. A lubricating oil supply pipe 43 connected to the lubricating oil heater 40 is connected to the lubricating oil tank 30. The lubricating oil heater 40 is connected to a lubricating oil supply pump 39 by a lubricating oil supply pipe 44. A lubricating oil supply pipe 45 provided with a check valve 41 connects the lubricating oil supply pump 39 and the lubricating oil supply pipe 35. An air supply pipe 46 provided with an on-off valve 42 connects the air storage tank 19 and the lubricating oil supply pump 39. An electric heater (heating device) 52 is installed in the lubricating oil heater 40.

  The air driven generator 48 will be described with reference to FIG. The air-driven generator 48 includes a casing 49, an air turbine 50, a rotating shaft 51, a rotor 52, and a stator 53. The air turbine 50, the rotating shaft 51, the rotor 52, and the stator 53 are disposed in the casing 49. The rotating shaft 51 is supported by a bearing 54 installed in the casing 49. An air turbine 50 and a rotor 52 are attached to the rotating shaft 51. An annular stator 53 installed in the casing 49 surrounds the rotor 52. Since a permanent magnet is used for the field of the rotor 52, an excitation power source for the rotor 52 is not required.

  The seal member 55 installed in the casing 49 seals the space in the casing 49 in which the air turbine 50 is disposed and the space in which the rotor 52 and the stator 53 are disposed. An air supply pipe 57 connected to the air storage tank 19 is connected to the air inlet side of the air turbine 50 of the casing 49. An on-off valve 56 is installed in the air supply pipe 57. An air exhaust pipe 58 is connected to the air exhaust side of the air turbine 50 of the casing 49. The air-driven generator 48 is installed on the gantry 61 by a support member 59.

  The on / off valves 42, 56, 62 and 63 are controlled to be opened and closed by the control device 64. A battery is connected to the control device 64.

  When the emergency diesel power generation facility 1 is in a standby state, the diesel engine 2 is not operating, so the crankshaft 10 is not rotating and the fresh water pump 26 and the lubricating oil tank 30 are also stopped. For this reason, the lubricating oil is not supplied to the bearings 11, 12, 16, and 17 when the emergency diesel power generation facility 1 is on standby.

  When the operation of the boiling water nuclear power plant is stopped, the on-site power supply is cut off, and the external power supply is also turned off, the emergency diesel power generation facility 1 is activated. The starting of the emergency diesel power generation facility 1 will be described.

  When the in-house power supply and the external power supply are in a power failure state, a power failure signal is input to the control device 64. When the power failure signal is input, the control device 64 outputs an open signal to the on-off valves 42, 56, 62, and 63, and opens these on-off valves. The control device 64 outputs an open signal simultaneously to the on-off valves 42 and 56, and then outputs an open signal in the order of the on-off valve 62 and the on-off valve 63.

  When the on-off valve 56 is opened, the compressed air in the air storage tank 19 is supplied into the air-driven generator 48 through the air supply pipe 57. The air turbine 50 is rotated by the compressed air and rotates the rotor 52. The compressed air that has rotated the air turbine 50 is discharged to the air discharge pipe 58. Electric power is generated by the rotation of the rotor 52 and the generated electric power is taken out from the stator 53. This electric power is supplied to the electric heater 52. For this reason, when the in-house power supply and the external power supply are out of power, the lubricating oil supply pump 39 is driven and the lubricating oil in the lubricating oil tank 30 is guided to the lubricating oil heater 40 as will be described later. This lubricating oil is heated to a set temperature in the lubricating oil heater 40 by an electric heater 52 to which electric power generated by the air-driven generator 48 is supplied. The seal member 55 installed in the air driven generator 48 prevents the compressed air supplied to the air turbine 50 from leaking into the space in the casing 47 where the rotor 52 and the stator 53 are disposed. Yes.

  Since the on-off valve 42 is opened, the compressed air in the air storage tank 19 is supplied to the lubricating oil supply pump 39 through the air supply pipe 46 and the lubricating oil supply pump 39 is driven. Thereby, the lubricating oil in the lubricating oil tank 30 is guided to the lubricating oil heater 40 and heated to the set temperature as described above. The lubricating oil heated to the set temperature by the electric heater 52 is supplied from the lubricating oil heater 40 to the lubricating oil supply pump 39 by the lubricating oil supply pipe 44, and the pressure is increased by the lubricating oil supply pump 39. The lubricating oil is supplied to the bearings 11, 12, 16, and 17 through the lubricating oil supply pipes 45 and 35, respectively. The lubricating oil discharged from the bearings 11, 12, 16, and 17 is returned to the lubricating oil tank 30 through the lubricating oil return pipe 36. The lubricating oil in the lubricating oil tank 30 is guided to the lubricating oil heater 40 through the lubricating oil supply pipe 43 and heated by the electric heater 52. The circulating flow of the lubricating oil flowing through the lubricating oil tank 30, the lubricating oil heater 40, the lubricating oil supply pump 39, the bearings 11, 12, 16, 17 and the lubricating oil tank 30 is while the lubricating oil supply pump 39 is driven. ,appear. Since the lubricating oil is supplied to the bearings 11, 12, 16, and 17 by driving the lubricating oil supply pump 39, before starting the diesel engine 2, between the crankshaft 10 and the bearings 11 and 12, and between the rotor 14 and the bearings. A film of lubricating oil heated by the electric heater 52 can be formed between 16 and 17.

  The on-off valve 63 is opened based on the open signal output from the control device 64 after the lubricating oil supply pump 39 is driven. When the on-off valve 63 is opened, the compressed air in the air storage tank 19 is supplied into the cylinder 3 through the air pipe 20. The compressed air supplied into the cylinder 3 expands in the cylinder 3 and operates the piston 6. The reciprocating motion of the piston 6 is transmitted to the crankshaft 10 by the piston rod 7, and the crankshaft 10 rotates.

  After the crankshaft 10 is rotated, an open signal is output from the control device 64 to the on-off valve 62. Since the open / close valve 62 is opened by this open signal, the fuel oil in the fuel tank 22 is supplied into the cylinder 3 through the fuel pipe 23 by the action of gravity. Combustion air is supplied into the cylinder 3 through the intake pipe 8. Fuel oil is ignited in the cylinder 3 and the diesel engine 2 is started. Thereafter, the diesel engine 2 is driven by the supply of fuel oil. The exhaust gas generated in the cylinder 3 is discharged to the outside through the exhaust pipe 9.

  The rotation of the crankshaft 10 causes the rotor 14 connected to the crankshaft 10 to rotate, and the electric power generated from the stator 15 is taken out. This electric power is supplied to a necessary part of the boiling water nuclear power plant.

  When the diesel engine 2 is started and the crankshaft 10 is rotated, the on-off valves 42, 56, and 63 are closed. For this reason, the supply of compressed air from the air storage tank 19 to the cylinder 3 is stopped. The supply of compressed air from the air storage tank 19 to the lubricating oil supply pump 39 is stopped, and the driving of the lubricating oil supply pump 39 is stopped. Further, the supply of compressed air from the air storage tank 19 to the air driven generator 48 is stopped, and the drive of the air driven generator 48 is stopped. Thereby, the supply of current from the air-driven generator 48 to the electric heater 52 is stopped.

  The lubricant oil 31 is supplied to the bearings 11, 12, 16, and 17 after the lubricant oil supply pump 39 is stopped. The lubricating oil pump 31 connected to the crankshaft 10 is driven by the rotation of the crankshaft 10. The lubricating oil in the lubricating oil tank 30 is boosted by the lubricating oil pump 31 and guided to the cooler 32 by the lubricating oil supply pipe 34. The lubricating oil cooled to a predetermined temperature by the cooler 32 is supplied to the bearings 11, 12, 16, and 17 through the lubricating oil supply pipe 35. The lubricating oil discharged from the bearings 11, 12, 16, and 17 is returned to the lubricating oil tank 30 through the lubricating oil return pipe 36. Since the temperature of the bearings 11, 12, 16, and 17 is increased by the rotation of the crankshaft 10 and the rotor 14, it is necessary to supply the bearings 11, 12, 16, and 17 with lubricating oil whose temperature has been decreased by cooling by the cooler 32. There is.

  When the diesel engine 2 is started and the crankshaft 10 is rotated, the cylinder 3 needs to be cooled. The cylinder 3 is cooled by a cooling water system 24. The fresh water pump 26 connected to the crankshaft 10 is driven by the rotation of the crankshaft 10. The fresh water in the fresh water tank 25 cooled by the cooler 60 is boosted by the fresh water pump 26 and supplied to the cylinder cooling chamber 4. This fresh water flows out from the cylinder cooling chamber 4 to the cylinder cooling chamber 5 and is returned to the fresh water tank 25 by the fresh water return pipe 28. The cylinder 3 is cooled by fresh water supplied to the cylinder cooling chamber 4 and the cylinder cooling chamber 5.

  In this embodiment, the lubricating oil is not supplied to the bearings 11, 12, 16, and 17 in the standby state of the emergency diesel power generation facility, and the lubricating oil supply pump is supplied by compressed air when the in-house power supply and the external power supply are interrupted. 39 is driven to supply lubricating oil to the bearings 11, 12, 16, and 17, and an oil film can be formed on the bearings 11, 12, 16, and 17 before the diesel engine 2 is started. This eliminates the need for a lubricating oil priming pump that is provided in the prior art and supplies lubricating oil to the bearings 11, 12, 16, and 17 in a standby state, and the emergency diesel power generation facility can be made compact.

  In this embodiment, when the supply of current from the in-house power supply and the external power supply is stopped, compressed air is supplied to the air-driven generator 48, and electric power is generated by the air-driven generator 48. Since this electric power is supplied to the electric heater 52, the lubricating oil supplied to the bearings 11, 12, 16, and 17 can be heated to a set temperature. For this reason, the temperature of the bearings 11, 12, 16, and 17 rises, and the starting time of the diesel engine 2 can be further shortened.

  In the present embodiment, no current is supplied to the electric heater 52 and the lubricating oil is not heated during standby of the emergency diesel power generation facility. For this reason, the power consumption in the emergency diesel power generation facility during standby of the emergency diesel power generation facility becomes zero.

  The emergency diesel power generation facility 1 of the present embodiment can be applied to other nuclear power plants such as a pressurized water nuclear power plant. Furthermore, the emergency diesel power generation facility 1 of the present embodiment can be applied to a thermal power plant and a chemical plant.

It is a block diagram of the emergency diesel power generation equipment which is one suitable Example of this invention. It is a block diagram of the air drive generator shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Emergency diesel power generation equipment, 2 ... Diesel engine, 3 ... Cylinder, 6 ... Piston, 10 ... Crankshaft, 11, 12, 16, 17 ... Bearing, 13 ... Generator, 14 ... Rotor, 15 ... Stator, 18 ... start air system, 19 ... air storage tank, 21 ... fuel oil system, 22 ... fuel tank, 24 ... cooling water system, 25 ... fresh water tank, 26 ... fresh water pump, 29 ... lubricating oil system, 30 ... lubricating oil tank, 31 ... Lubricating oil pump, 37 ... starting auxiliary device, 38 ... lubricating oil auxiliary device, 39 ... lubricating oil supply pump, 40 ... lubricating oil heater, 48 ... air driven generator, 49 ... casing, 50 ... air turbine, 52 ... rotation Child, 53 ... Stator.

Claims (5)

  A diesel engine; a first generator having a rotor coupled to a rotating shaft of the diesel engine; a starting device for starting the diesel engine using compressed air; a first bearing that supports the rotating shaft; and the rotor A lubricating oil supply device having a first lubricating oil supply pump that is driven by the rotation of the rotary shaft to increase the pressure of the lubricating oil, and when starting the diesel engine. A second lubricating oil supply pump that is driven by compressed air and pressurizes the lubricating oil supplied to the first and second bearings, and a second power generator that is driven by compressed air when starting the diesel engine. And a heating device that is supplied with electric power generated by the second generator and that heats the lubricating oil supplied to the first and second bearings by the second lubricating oil supply pump. Emergency diesel power generation equipment which is characterized in that there was example.   The emergency according to claim 1, further comprising a storage tank for storing the compressed air for starting the diesel engine, the compressed air for driving the second lubricating oil supply pump, and the compressed air for driving the second generator. Diesel power generation equipment.   A first valve provided in a first pipe for supplying the compressed air to the diesel engine, a second valve provided in a second pipe for supplying the compressed air to the second lubricating oil supply pump, and the compressed air The emergency diesel power generation facility according to claim 1 or 2, further comprising a control device that controls a third valve provided in a third pipe that supplies the second generator to the second pipe. A diesel engine; a first generator having a rotor coupled to a rotating shaft of the diesel engine; a starting device for starting the diesel engine using compressed air; a first bearing that supports the rotating shaft; and the rotor An emergency diesel power generation facility comprising a lubricating oil supply device having a first lubricating oil supply pump that supplies a lubricating oil to a second bearing that supports the first bearing and that is driven by rotation of the rotary shaft to boost the lubricating oil. In driving method,
When starting the diesel engine, the second lubricating oil supply pump is driven by compressed air, and the lubricating oil boosted by the second lubricating oil supply pump is supplied to the first and second bearings,
When starting the diesel engine, the second generator is driven by compressed air to generate electric power,
Supplying power from the second generator to a heating device that heats the lubricating oil supplied to the first and second bearings by the second lubricating oil supply pump;
An operation method of an emergency diesel power generation facility, wherein the diesel engine is started after the heated lubricating oil is supplied to the first and second bearings.   The compressed air for starting the diesel engine, the compressed air for driving the second lubricating oil supply pump, and the compressed air for driving the second generator are supplied from one storage tank. How to operate an emergency diesel generator.

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