JP2007263084A - Cogeneration system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cogeneration system capable of varying a supply ratio of heat and electricity. <P>SOLUTION: Supply water 10 supplied by a water-supply pump 9 is made overheated steam with exhaust gas 7 from an outlet of a gas turbine 3 used as a heat source of an exhaust gas boiler 8, and a steam turbine 11 is driven to operate a steam compressor 12. The steam compressor 12 generates the overheated steam by compressing water cooling medium 17, which has been reduced in pressure at an expansion valve 14 and vaporized with a heat source of exhaust heat 18 or the like in an evaporator 13, mixes it with overheated steam at an outlet of the steam turbine 11 and supplies it to steam utilizing equipment. As a generator motor 15 is connected to the steam turbine 11, when a demand for electricity increases more than that for steam, the generator motor 15 can be operated as a power generator to increase electric output. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a thermoelectric supply system.

  In a thermoelectric supply system that compresses water vapor with a conventional compressor and obtains high-temperature water vapor, steam supply and electricity supply are performed in batch as described in Japanese Patent Publication No. 7-4212. . Also, in a thermoelectric supply system that recovers exhaust heat of a steam turbine condenser with a heat pump, the ratio between the amount of power generation and the amount of recovered heat is determined by the initial system configuration as described in Japanese Patent Laid-Open No. 2000-251125. It is configured to

Japanese Patent Publication No. 7-4212 JP 2000-251125 A

  In conventional thermoelectric supply systems, the supply ratio of electricity and heat is fixed, so if the demand for power increases in summer, the output of the prime mover that drives the generator increases, increasing the amount of exhaust heat and supplying heat When there is a surplus and the demand for the amount of heat supplied increases in winter, there is a problem that electricity becomes surplus and wastes resources.

  Also, depending on the manufacturing process, the demand ratio of electricity and heat may change during the manufacturing process. Conventionally, when power is insufficient, power sales are purchased, and when excess heat is generated, it is discarded. There was a problem that wasted economically.

  The objective of this invention is providing the thermoelectric supply system which can respond to the change of the demand of electric power and heat quantity.

  The purpose is to compress steam with a compressor driven by a steam turbine powered by steam generated by exhaust heat from a prime mover driving a generator, and use steam together with the outlet steam of the steam turbine as high-temperature steam. This is achieved by connecting a generator motor to the steam turbine in the thermoelectric supply system for supplying to the steam turbine.

  The above object is achieved by the fact that the generator motor and the compressor are driven by a steam turbine via a clutch.

  The above object is achieved by arranging a plurality of pinions that mesh with the large gears, and attaching a compressor impeller and a turbine impeller to the shaft of each pinion.

  In addition, the above object is to compress steam with a compressor driven by a steam turbine that uses steam generated by exhaust heat of a prime mover driving a generator as a power source, and use the steam together with the outlet steam of the steam turbine as high-temperature steam. In a thermoelectric supply system for supplying equipment, a rotating shaft of a generator motor is connected to a rotating shaft of a large gear, and a plurality of pinions meshing with the large gear are arranged, and a compressor impeller and a turbine are arranged on each pinion shaft. This is achieved by installing an impeller.

  ADVANTAGE OF THE INVENTION According to this invention, the thermoelectric supply system which can respond to the change of the demand of electric power and heat quantity can be provided.

  Examples of the present invention will be described below.

FIG. 1 is a configuration diagram of a thermoelectric supply system according to an embodiment of the present invention. As shown in FIG. 1, the outside air 6 compressed by the air compressor 1 is conveyed to the combustor 2 and burned with the fuel 5 such as city gas or kerosene to become high-temperature and high-pressure gas. The turbine 3 is driven to generate power with the generator 4. At this time, since the exhaust gas 7 at the outlet of the gas turbine 3 is about 640 ° C., as the heat source of the exhaust gas boiler 8, the supply water 10 of about 30 ° C. pressurized to about 7 MPa by the feed water pump 9 is superheated steam of about 500 ° C. It can be.

  When this superheated steam is expanded to about 0.4 Mpa by the steam turbine 11, power of about 610 kW can be generated per 1 kg / s of the steam flow rate, so that the steam compressor 12 can be driven. This water vapor compressor 12 compresses water refrigerant 17 which is supplied by a pump 16 and decompressed by an expansion valve 14 to about 0.20 Mpa and about 60 ° C. and evaporated in the evaporator 13 using exhaust heat 18 and the like as a heat source to about 0.4 Mpa. To produce superheated steam. At this time, if the steam compressor 12 is an intermediate-cooled four-stage compressor, the superheated steam temperature is about 210 ° C., so it is mixed with superheated steam at about 170 ° C. at the outlet of the steam turbine 11 and used as steam at about 190 ° C. It can be supplied to equipment (not shown).

  Here, since the generator motor 15 is connected to the steam turbine 11, when the demand for electricity increases from steam, the generator motor 15 can be operated as a generator to increase the electrical output. At this time, it goes without saying that the capacity of the water vapor compressor 12 is controlled by a suction vane (not shown) or the like. When the demand for electricity decreases, the amount of fuel 5 that is normally charged into the combustor 2 is decreased, so that the amount of heat of the exhaust gas 7 is decreased and the output of the steam turbine 11 is also decreased. At this time, when the demand for steam does not decrease or increases, it is possible to operate the generator motor 15 as a motor and increase the driving power of the steam compressor 12 to maintain or increase the steam supply amount.

FIG. 2 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. A economizer 19 is installed at the outlet of the exhaust gas boiler 8 to preheat the feed water 10 and circulate a part of the preheated feed water 10 to the expander 21 connected to the steam turbine 11 and the steam compressor 12, and the others are high pressure The point which comprised so that it might supply to the exhaust gas boiler 8 with the supply pump 20 differs from the Example shown in FIG.

  With this configuration, heat can be further recovered from the exhaust gas of about 180 ° C. at the outlet of the exhaust gas boiler 8 to drive the steam turbine 11 and power can be recovered by the expander 21, so that the thermal efficiency of the system can be improved. At this time, the inlet of the expander 21 is about 0.2 Mpa and about 120 ° C.

FIG. 3 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. The steam turbine 11 and the generator motor 15 are connected via a clutch 22, the steam turbine 11 and the steam compressor 12 are connected via a clutch 23, and a valve 24 is provided at the outlet of the steam compressor 12. This is different from the embodiment shown in FIG.

  With this configuration, when the demand for electricity is extremely high, the clutch 22 is connected and the generator motor 15 is operated as a generator, the clutch 23 is disconnected, the valve 24 is closed, and the steam compressor 12 is operated. Since it can be stopped, the steam turbine 11 can be used only for power generation and can increase the amount of power generation. Further, when it is not necessary to use the generator motor 15 as a motor, the loss caused when the generator motor 15 is idled can be eliminated by disengaging the clutch 22.

FIG. 4 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. A economizer 19 is installed at the outlet of the exhaust gas boiler 8 to preheat the feed water 10 and circulate a part of the preheated feed water 10 to the expander 21 connected to the steam turbine 11 and the steam compressor 12, and the others are high pressure 3 is different from the embodiment shown in FIG. 3 in that the supply pump 20 supplies the exhaust gas boiler 8 with a valve 24 at the outlet of the steam compressor 12 and a valve 25 at the inlet of the expander 21.

  With this configuration, when the demand for electricity is extremely high, the clutch 22 is connected to operate the generator motor 15 as a generator, the clutch 23 is disconnected, the valve 24 and the valve 25 are closed, and the steam compressor 12 Since the operation can be stopped, the steam turbine 11 can be used only for power generation and the power generation amount can be increased. Further, heat is further recovered from the exhaust gas of about 180 ° C. at the outlet of the exhaust gas boiler 8 to drive the steam turbine 11, and when the steam compressor 12 is driven, power can be recovered by the expander 21, so that the thermal efficiency of the system can be improved. .

FIG. 5 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. Steam compressors 12a, 12b, 12c are installed in multiple stages, spray cooling nozzles 29a, 29b are provided between the stages, spray water is supplied by a pump 28, and pinions 27a, 27b meshing with the large gear 26 are provided.
3 is different from the embodiment of FIG. 3 in that the power of the steam turbine 11 is transmitted to the steam compressors 12a, 12b, and 12c through 27c.

  With this configuration, the driving power of the steam compressor can be reduced, and the gear ratio between the large gear 26 and the pinions 27a and 27b can be arbitrarily set, so that the steam compressor in each stage can be operated at an optimum rotational speed and further thermal efficiency can be achieved. Can be improved. Needless to say, the number of compressor stages can be set arbitrarily according to the operating conditions.

FIG. 6 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. Steam compressors 12a, 12b, 12c are installed in multiple stages, spray cooling nozzles 29a, 29b are provided between the stages, spray water is supplied by a pump 28, and pinions 27a, 27b meshing with the large gear 26 are provided.
4 differs from the embodiment shown in FIG. 4 in that the power of the steam turbine 11 is transmitted to the steam compressors 12a, 12b, and 12c through 27c.

  With this configuration, the driving power of the steam compressor can be reduced, and the gear ratio between the large gear 26 and the pinions 27a and 27b can be arbitrarily set, so that the steam compressor in each stage can be operated at an optimum rotational speed and further thermal efficiency can be achieved. Can be improved.

  FIG. 7 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. Steam compressors 12a, 12b, and 12c are installed in multiple stages, spray cooling nozzles 29a and 29b are provided between the stages, spray water is supplied by a pump 28, and the generator motor 15 is connected to the rotating shaft of the large gear 26. 1 is different from the embodiment of FIG. 1 in that the steam turbine 11 is attached to the pinion 27a meshing with the large gear 26, the steam compressor 12a is attached to the pinion 27b, and the steam compressors 12b and 12c are attached to the pinion 27c. .

With this configuration, the driving power of the water vapor compressor can be reduced, and the gear ratio between the large gear 26 and the pinions 27a and 27b can be arbitrarily set. Therefore, the water vapor compressor in each stage can be operated at the optimum rotational speed, and the low speed can be reduced. Since the generator motor 15 can be used, reliability can be improved.

  FIG. 8 is a configuration diagram of a thermoelectric supply system according to another embodiment of the present invention. 7 differs from the embodiment shown in FIG. 7 in that the large gear 26 and the generator motor 15 are coupled via the clutch 22, and the steam turbine 11 and the pinion 27a are coupled via the clutch 23.

  With this configuration, when it is not necessary to use the generator motor 15 as a motor, it is possible to eliminate the loss caused when the generator motor 15 is idled by disengaging the clutch 22 and to maintain the gas turbine. Sometimes the steam 23 can be generated by disengaging the clutch 23 and connecting the clutch 22 to operate the generator motor 15 as a motor.

It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention. It is a lineblock diagram of the thermoelectric supply system concerning one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air compressor, 2 ... Combustor, 3 ... Gas turbine, 4 ... Generator, 8 ... Exhaust gas boiler,
DESCRIPTION OF SYMBOLS 11 ... Steam turbine, 12 ... Steam compressor, 13 ... Evaporator, 14 ... Expansion valve, 15 ... Generator motor, 17 ... Water refrigerant.

Claims (4)

  Thermoelectric power is compressed by a compressor driven by a steam turbine powered by steam generated by the exhaust heat of the prime mover that drives the generator, and supplied to the steam utilization equipment together with the steam exiting the steam turbine as high-temperature steam. A thermoelectric supply system characterized in that a generator motor is connected to a steam turbine in the supply system. The thermoelectric supply system according to claim 1, wherein
A thermoelectric supply system in which a generator motor and a compressor are driven by a steam turbine via a clutch. In the thermoelectric supply system according to claim 1 or 2,
A thermoelectric supply system comprising a plurality of pinions engaging with a large gear, and a compressor impeller and a turbine impeller attached to each pinion shaft. Thermoelectric power is compressed by a compressor driven by a steam turbine powered by steam generated by the exhaust heat of the prime mover that drives the generator, and supplied to the steam utilization equipment together with the steam exiting the steam turbine as high-temperature steam. In the supply system, the rotation shaft of the generator motor is connected to the rotation shaft of the large gear, a plurality of pinions that mesh with the large gear are arranged, and the compressor impeller and the turbine impeller are attached to the shaft of each pinion. A thermoelectric supply system characterized by that.

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