EP3112621B1 - Système de génération d'énergie et procédé de génération d'énergie - Google Patents

Système de génération d'énergie et procédé de génération d'énergie Download PDF

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Publication number
EP3112621B1
EP3112621B1 EP16177137.3A EP16177137A EP3112621B1 EP 3112621 B1 EP3112621 B1 EP 3112621B1 EP 16177137 A EP16177137 A EP 16177137A EP 3112621 B1 EP3112621 B1 EP 3112621B1
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EP
European Patent Office
Prior art keywords
steam
displacement type
power generation
expanders
heat amount
Prior art date
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Application number
EP16177137.3A
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German (de)
English (en)
Other versions
EP3112621A1 (fr
Inventor
Tamotsu Fujioka
Atsushi Unami
Takaaki Izumi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anest Iwata Corp
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Anest Iwata Corp
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting

Definitions

  • the present invention relates to a power generation system and a power generation method.
  • a device which generates power by expanding steam in an expander.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2012-202262
  • an evaporator, an expander, and a condenser constitute one power generation cycle, and a plurality of such power generation cycles are provided.
  • a heating medium cutoff valve and a cooling medium cutoff valve are provided in the device.
  • a power generation amount is detected, and the heating medium cutoff valve and the cooling medium cutoff are opened and closed according to the detected value of the power generation amount and a heating medium discharge temperature.
  • US 2011/016863 A1 relates to a thermodynamic system for waste heat recovery, using an organic rankine cycle which employs a single organic heat transferring fluid to recover heat energy from two waste heat streams having differing waste heat temperatures.
  • US 2006/112693 A1 relates to a method and apparatus for generating power aboard a marine vessel using a Rankine Cycle device that includes at least one of each of an evaporator, a turbo-generator that includes a turbine coupled with an electrical generator, a condenser, and a refrigerant feed pump.
  • US 2014/102101 A1 relates to heat engine systems and methods for recovering energy, such as by generating electricity from thermal energy.
  • An object of the present invention is to provide a power generation system and a power generation method whereby sufficient power can be generated without reductions in the overall efficiency even when an input heat amount fluctuates.
  • An aspect of the present invention is a power generation system including a plurality of displacement type expanders and a plurality of power generators connected to each of the plurality of displacement type expanders, and generating power by expansion of steam at least at one of the displacement type expanders, the system including a suppression means that is capable of suppressing circulation of the steam for each of the displacement type expanders, and a control unit that controls a load ratio per the displacement type expander by controlling the suppression means based on information on a heat amount of the steam.
  • Another aspect of the present invention is a power generation method where power is generated, using a power generation system including a plurality of displacement type expanders, and a plurality of power generators connected to each of the plurality of displacement type expanders, by expansion of steam at least at one of the displacement type expanders, and the method includes adjusting a load ratio per the displacement type expander based on information on a heat amount of the steam.
  • a plurality of displacement type expanders to each of which a power generator is connected are provided.
  • a load ratio per one displacement type expander is adjusted based on information on the heat amount of steam. For example, in a case where an input heat amount decreases, it is possible to efficiently control power generation by increasing the load ratio per one displacement type expander. In addition, in a case where the input heat amount increases, it is possible to efficiently control power generation by decreasing the load ratio per one displacement type expander. Therefore, even when the input heat amount fluctuates, sufficient power can be generated by as many displacement type expanders as necessary without reduces in the overall efficiency.
  • the numbers of the displacement type expanders are N units.
  • the control unit stores at least (N - 1) different thresholds for the information on the heat amount of steam, and may put (a + 1) units of the displacement type expanders into operation when detecting the information on the heat amount of steam and evaluating that the detected information has exceeded an a-th (a is any integer from 1 to (N - 1)) smallest threshold of the (N - 1) thresholds.
  • FIG. 1 solid lines indicate electric circuits.
  • Two-dot chain lines indicate steam circuits.
  • the broken lines illustrated so as to be connected to a control unit 30 indicate control circuits.
  • an example of steam is water vapor.
  • the steam power generation system 1 is a power generation system which generates power using high-temperature steam (for example, about 170 to 180°C at a pressure of 0.7 to 0.8 MPa) as a heat source.
  • the steam power generation system 1 includes a first scroll expander 6A, a second scroll expander 6B, and a third scroll expander 6C.
  • expansion of steam at the first scroll expander 6A rotates an output shaft thereof, and power is generated by the first power generator 7A.
  • expansion of steam at the second scroll expander 6B rotates an output shaft thereof, and power is generated by the second power generator 7B.
  • expansion of steam at the third scroll expander 6C rotates an output shaft thereof, and power is generated by the third power generator 7C.
  • a steam line L1 is provided in the steam power generation system 1, and steam at a predetermined pressure is supplied through the steam line L1.
  • the steam line L1 is provided with an inlet detector 11 for detecting information on the heat amount of steam.
  • the information on the heat amount of steam means any one, or two or more pieces of information on flow rates, temperatures, and pressures of the steam.
  • the inlet detector 11 detects the information on steam supplied to the first to third scroll expanders 6A to 6C.
  • the "line” means a pipe through which a fluid flows.
  • the steam line L1 is branched into three lines.
  • a first steam supply line L1A is connected to the first scroll expander 6A
  • a second steam supply line LIB is connected to the second scroll expander 6B
  • a third steam supply line L1C is connected to the third scroll expander 6C.
  • These first to third steam supply lines L1A to L1C are provided with a first to third electromagnetic valves 16A to 16C for stopping (blocking) or suppressing circulation of steam in each line. That is, each of the first to third electromagnetic valves 16A to 16C can suppress circulation of steam by adjustment of the opening therof. In addition, each of the first to third electromagnetic valves 16A to 16C can stop circulation of steam by fully closing.
  • the first to third electromagnetic valves 16A to 16C correspond to suppression means capable of suppressing circulation of steam into the first to third scroll expanders 6A to 6C, respectively.
  • a first steam emission line L2A connected to a steam outlet of the first scroll expander 6A, a second steam emission line L2B connected to a steam outlet of the second scroll expander 6B, and a third steam emission line L2C connected to a steam outlet of the third scroll expander 6C are joined into one line, and steam is released to the atmosphere.
  • Each of the first to third power generators 7A to 7C is connected to an inverter 17 via a ground detector, an electromagnetic contactor, and the like.
  • the inverter 17 is connected to a three-phase alternate current (for example, 200 V) commercial power source 21.
  • a load 18 such as an electric motor is connected to the inverter 17.
  • the steam power generation system 1 includes a control unit 30 that adjusts a load ratio for each of the first to third scroll expanders 6A to 6C by controlling the above suppression means based on the information on the heat amount of steam.
  • the control unit 30 is a computer including hardware such as a central processing unit (CPU), a read only memory (ROM), and a random access memory (RAM) and software such as programs stored in the ROM.
  • CPU central processing unit
  • ROM read only memory
  • RAM random access memory
  • the above-described inlet detector 11 sequentially transmits the detected information to the control unit 30.
  • the control unit 30 acquires the information on the heat amount of steam and controls, based on the acquired information, opening and closing of the first to third electromagnetic valves 16A to 16C.
  • the load ratio for each of the first to third scroll expanders 6A to 6C can be adjusted.
  • the full opening and full closing control of the first to third electromagnetic valves 16A to 16C the number of first to third scroll expanders 6A to 6C to be operated can be controlled. As described, in the steam power generation system 1, it is possible to narrow down the number of displacement type expanders to be operated.
  • the control unit 30 stores at least two (N-1) different thresholds for the information on the heat amount of steam.
  • the control unit 30 stores two thresholds (here, for example, a first threshold of 40%, and a second threshold of 70%) for the input heat amount (%) calculated based on the detection results at the inlet detector 11.
  • the input heat amount (%) means a ratio of the actual heat amount of steam to a rated heat amount of three series as a whole.
  • the control unit 30 uses these thresholds for adjusting and controlling the load ratios of the first to third scroll expanders 6A to 6C or the numbers of first to third scroll expanders 6A to 6C to be operated.
  • the control unit 30 calculates values corresponding to the above thresholds (values at the same level as the thresholds) based on the information on the heat amount of steam sent from the inlet detector 11 while the steam power generation system 1 is in operation. At the stage above, the control unit 30 calculates a present input heat amount based on the information from the inlet detector 11.
  • the control unit 30 evaluates whether the calculated input heat amount has exceeded the first and second thresholds described above. Once evaluating that the input heat amount has been less than or equal to the first threshold, the control unit 30 opens only the first electromagnetic valve 16A and closes the other electromagnetic valves. This puts only the first scroll expander 6A that forms a first series into operation. Once evaluating that the input heat amount has exceeded the first threshold, the control unit 30 opens the second electromagnetic valve 16B. This puts the second scroll expander 6B that forms a second series into operation, resulting in a total of two series put into operation. Once evaluating that the input heat amount has exceeded even the second threshold, the control unit 30 further opens the third electromagnetic valve 16C. This puts the third scroll expander 6C that forms a third series into operation, resulting in a total of three series put into operation.
  • the number of units to be operated is switched with the first threshold of 40% and the second threshold of 70% as boundaries.
  • the heat amounts of the steam distributed to a plurality of scroll expanders simultaneously in operation are set equal. Therefore, rotation speeds at the scroll expanders are equal. (The figure shows that the rotation speeds at the scroll expanders are equal (lines are overlapped) by differentiating line types.)
  • the rotation speed at each scroll expander is changed gradually with each change by 10% in input heat amount.
  • control unit 30 puts two units of displacement type expanders into operation when detecting the information on the heat amount of steam and evaluating that the detected information has exceeded the first threshold (the smallest threshold) of two (N-1) thresholds.
  • the control unit 30 puts three units of displacement type expanders into operation when evaluating that the information on the detected heat amount has exceeded the second threshold (the second smallest threshold) of two (N-1) thresholds.
  • the plurality of displacement type expanders 6A to 6C to which the first to third power generators 7A to 7C are connected, respectively, is provided. Opening and closing of the first to third electromagnetic valves 16A to 16C are controlled by the control unit 30 based on the information on the heat amount of steam. This adjusts the load ratio for each of the displacement type expanders 6A to 6C. For example, in a case where an input heat amount decreases, it is possible to efficiently control power generation by increasing the load ratio per one displacement type expander. In addition, in a case where the input heat amount increases, it is possible to efficiently control power generation by decreasing the load ratio per one displacement type expander. Therefore, even when the input heat amount fluctuates, sufficient power can be generated by as many displacement type expanders 6A to 6C as necessary without reductions in the overall efficiency.
  • the steam power generation system 1 can deal with a wide range of heat amounts, from a small heat amount to a great heat amount, and is especially advantageous in a fluctuation where a fluctuation in heat amount is large.
  • the control unit 30 puts (a + 1) units of displacement type expanders into operation when detecting the information on the heat amount of steam, which is a heat source medium, and evaluating that the detected information has exceeded an a-th (a is any integer between 1 and 2) smallest threshold of two thresholds.
  • a-th any integer between 1 and 2 smallest threshold of two thresholds.
  • the present invention has been described above; however, the present invention is not limited to the above embodiments.
  • the number of series (number of units) of displacement type expanders may be 4 or more. Even when a number of series are provided, the control of the present invention can generate power simply and efficiently with the most appropriate number of units to be operated in accordance with the heat amount of steam as a heat source medium.
  • the number of thresholds stored by the control unit 30 is not limited to that less than the number of series by 1.
  • the number of thresholds may be more or less than that.
  • a suppression means is not limited to the electromagnetic valve.
  • a pump may be independently provided to each series, and circulation may be suppressed/stopped by flow rate adjustment and on-off operation of the pump.
  • a three-way valve may be used at a branch point.
  • the displacement type expanders are not limited to the scroll expanders. Instead of the first to third scroll expanders 6A to 6C, other displacement type expanders may be used. For example, various types of expanders such as screw expanders, claw expanders, reciprocating expanders, and root expanders may be used. Steam other than water vapor may be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Eletrric Generators (AREA)
  • Control Of Turbines (AREA)

Claims (2)

  1. Système de génération d'énergie (1) comprenant une pluralité de détendeurs de type à déplacement (6A-6C) et une pluralité de générateurs électriques (7A-7C) reliés chacun à un des détendeurs de la pluralité de détendeurs de type à déplacement (6A-6C), et générant de l'énergie par détente de vapeur au moins sur un des détendeurs de type à déplacement (6A-6C), ledit système comprenant :
    une pluralité de lignes dérivées (L1A-L1C) d'une ligne (L1) où circule la vapeur, chaque ligne dérivée (L1A-L1C) étant reliée à un détendeur de type à déplacement (6A-6C) correspondant ;
    un moyen de suppression (16A-16C) apte à supprimer la circulation de vapeur de chaque détendeur de type à déplacement (6A-6C) dans les lignes dérivées (L1A-L1C) ;
    caractérisé en ce que ledit système comprend
    une unité de commande (30) réglant un rapport de charge par détendeur de type à déplacement (6A-6C), par commande du moyen de suppression (16A-16C) sur la base d'une information sur une quantité de chaleur de la vapeur ;
    le nombre de détendeurs de type à déplacement (6A-6C) étant de N unités ;
    l'unité de commande (30) mémorisant au moins N - 1 seuils différents pour l'information sur la quantité de chaleur de la vapeur ; et
    où l'unité de commande (30) met en service a + 1 unités des détendeurs de type à déplacement (6A-6C) une fois détectée l'information sur la quantité de chaleur de la vapeur et en évaluant que l'information détectée a dépassé un aème, a étant un entier quelconque compris entre 1 et N - 1, le seuil inférieur des N - 1 seuils.
  2. Procédé de génération d'énergie où de l'énergie est générée au moyen d'un système de génération d'énergie (1) comprenant une pluralité de détendeurs de type à déplacement (6A-6C), une pluralité de générateurs électriques (7A-7C) reliés chacun à un des détendeurs de la pluralité de détendeurs de type à déplacement (6A-6C), une pluralité de lignes dérivées (L1A-L1C) d'une ligne (L1) où circule la vapeur, chaque ligne dérivée (L1A-L1C) étant reliée à un détendeur de type à déplacement (6A-6C) correspondant, par détente de vapeur au moins sur un des détendeurs de type à déplacement (6A-6C), ledit procédé comprenant
    le réglage d'un rapport de charge par détendeur de type à déplacement (6A-6C) sur la base d'une information sur une quantité de chaleur de la vapeur ;
    le nombre de détendeurs de type à déplacement (6A-6C) étant de N unités,
    le système de génération d'énergie (1) comprenant en outre une unité de commande (30) mémorisant au moins N - 1 seuils différents pour l'information sur la quantité de chaleur de la vapeur ; et
    ledit procédé comprenant en outre la mise en service de a + 1 unités des détendeurs de type à déplacement (6A-6C) une fois détectée l'information sur la quantité de chaleur de la vapeur et en évaluant que l'information détectée a dépassé un aème, a étant un entier quelconque compris entre 1 et N - 1, le seuil inférieur des N - 1 seuils.
EP16177137.3A 2015-07-01 2016-06-30 Système de génération d'énergie et procédé de génération d'énergie Active EP3112621B1 (fr)

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JP2015132993A JP6778475B2 (ja) 2015-07-01 2015-07-01 発電システムおよび発電方法

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EP3112621B1 true EP3112621B1 (fr) 2019-08-07

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JP6778475B2 (ja) * 2015-07-01 2020-11-04 アネスト岩田株式会社 発電システムおよび発電方法

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Publication number Publication date
CN111058912A (zh) 2020-04-24
CN106321176B (zh) 2020-01-21
EP3112621A1 (fr) 2017-01-04
JP6778475B2 (ja) 2020-11-04
JP2017015016A (ja) 2017-01-19
CN106321176A (zh) 2017-01-11

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