# US 2017/0284231 A1 · Binary power generation system and control apparatus

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- Number: US 2017/0284231 A1
- Document ID: US20170284231A1
- Status: Published application
- Kind: A1
- Application number: 15/628,594
- Filed: 2017-06-20
- Published: 2017-10-05
- Earliest claimed: 2015-03-05
- Assignees: Fuji Electric Co., Ltd.
- Applicants: Fuji Electric Co., Ltd.
- Inventors: Shinya UI; Tadashi KOMATSU; Kuniyuki TAKAHASHI
- Web page: https://patentgrep.com/patent/US20170284231A1

## CPC

- F01K 23/10: with exhaust fluid of one cycle heating the fluid in another cycle (F01K17/025 takes precedence)
- B63J 3/02: from propulsion power plant
- F01K 23/065: {the combustion taking place in an internal combustion piston engine, e.g. a diesel engine}
- F01K 23/101: {Regulating means specially adapted therefor (F01K23/105, F01K23/108 take precedence)}
- F01N 5/02: the devices using heat
- F02G 5/04: in combination with other waste heat from combustion engines
- F01K 27/02: Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
- Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells
- F01K: STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES (gas-turbine or jet-propulsion plants F02; nuclear power plants, engine arrangements therein G21D)
- B63J: AUXILIARIES ON VESSELS
- F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16)
- F02G: HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS (steam engine plants, special vapour plants, plants operating on either hot gas or combustion-product gases together with other fluid F01K; gas-turbine plants F02C; jet-propulsion plants F02K); USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

Provided is a new binary power generation system that, in the binary power generation system using exhaust gas as a heating source, maximizes the power generation amount while considering the sulfuric acid dew point temperature of the exhaust gas. In this binary power generation system, corrosion due to sulfuric acid is prevented. Provided is a binary power generation system including a binary power generation apparatus that generates power by vaporizing a power generation medium using heat of exhaust gas output from a drive apparatus, wherein the binary power generation apparatus includes a control section that controls a mass flow rate of the power generation medium based on at least a sulfur concentration of the exhaust gas.

## Claims

### Claim 1

A binary power generation system comprising:
a binary power generation apparatus that generates power by vaporizing a power generation medium using heat of exhaust gas output from a drive apparatus, wherein
the binary power generation apparatus includes a control section that controls a mass flow rate of the power generation medium based on at least a sulfur concentration of the exhaust gas.

### Claim 2 (depends on 1)

The binary power generation system according to claim 1, wherein
the binary power generation apparatus includes a power generating section having a vaporizer into which is introduced the power generation medium that exchanges heat with the exhaust gas and a power generator that generates power using the power generation medium vaporized by the vaporizer, and
the control section controls the mass flow rate of the power generation medium further based on a dew point temperature of the exhaust gas between the drive apparatus and the vaporizer.

### Claim 3 (depends on 2)

The binary power generation system according to claim 2, wherein
the control section controls the mass flow rate of the power generation medium further based on an exhaust temperature, which is a temperature of the exhaust gas expelled from the vaporizer to outside.

### Claim 4 (depends on 3)

The binary power generation system according to claim 3, wherein
the power generating section includes:
a condenser that liquefies the power generation medium vaporized in the vaporizer and expelled from the power generator; and
a power generation medium pump that causes the power generation medium liquefied by the condenser to flow into the vaporizer,
the binary power generation apparatus further comprises a cooling section for cooling the power generation medium in the condenser,
the cooling section includes a cooling medium pump that causes a cooling medium to flow into the condenser, and
the control section controls a volumetric flow rate of the cooling medium pump according to fluctuation of a supercooling degree of the power generation medium in the condenser that changes according to the mass flow rate of the power generation medium pump.

### Claim 5 (depends on 4)

The binary power generation system according to claim 4, wherein
the control section controls the mass flow rate of the power generation medium pump further based on the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas and the mass flow rate of the power generation medium pump determined based on an output instruction value of power generation set for the control section and current output of the power generator.

### Claim 6 (depends on 5)

The binary power generation system according to claim 5, wherein
the power generating section further includes a first detector that measures temperature and pressure of the power generation medium between the condenser and the power generation medium pump,
the control section calculates the mass flow rate of the power generation medium pump and the volumetric flow rate of the cooling medium pump based on the temperature and the pressure of the power generation medium measured by the first detector, and
the control section controls at least one of the mass flow rate of the power generation medium pump and the volumetric flow rate of the cooling medium pump based on the calculated mass flow rate and volumetric flow rate.

### Claim 7 (depends on 6)

The binary power generation system according to claim 6, wherein
the control section calculates the supercooling degree of the power generation medium based on the temperature and the pressure of the power generation medium measured by the first detector, and
the control section calculates the mass flow rate of the power generation medium pump and the volumetric flow rate of the cooling medium pump based on the supercooling degree and a supercooling degree instruction value of the cooling medium set for the control section.

### Claim 8 (depends on 7)

The binary power generation system according to claim 7, wherein
the control section again calculates the mass flow rate of the power generation medium pump and the volumetric flow rate of the cooling medium pump further based on the supercooling degree instruction value of the cooling medium set for the control section and the supercooling degree of the power generation medium changed as a result of at least one of the mass flow rate of the power generation medium pump and the volumetric flow rate of the cooling medium pump being controlled based on the calculated mass flow rate and volumetric flow rate.

### Claim 9 (depends on 7)

The binary power generation system according to claim 7, wherein
the power generating section includes, between the vaporizer and the power generator, a buffer tank that temporarily stores the power generation medium that was vaporized by the vaporizer and the power generation medium that was not vaporized by the vaporizer, and
the control section controls the mass flow rate of the power generation medium pump further based on a level instruction value indicating an upper limit of an amount of liquid in the buffer tank set for the control section and a current amount of liquid in the buffer tank.

### Claim 10 (depends on 9)

The binary power generation system according to claim 9, wherein
the power generating section further includes a second detector that measures the temperature and the pressure of the power generation medium between the buffer tank and the power generator,
the control section calculates a superheating degree of the power generation medium based on the temperature and the pressure of the power generation medium measured by the second detector, and
the control section controls the mass flow rate of the power generation medium pump further based on the calculated superheating degree of the power generation medium and a superheating degree instruction value indicating a lower limit of the superheating degree set for the control section.

### Claim 11 (depends on 10)

The binary power generation system according to claim 10, wherein
the binary power generation apparatus further includes a display apparatus, and
the control section displays, in the display apparatus, which one of the dew point temperature of the exhaust gas, the supercooling degree instruction value of the cooling medium, the superheating degree instruction value indicating the lower limit of the superheating degree, and the level instruction value indicating the upper limit of the amount of liquid in the buffer tank is limiting a power generation amount, when the power generation amount requested by the control section is being limited to be lower than the output instruction value.

### Claim 12 (depends on 5)

The binary power generation system according to claim 5, wherein
the control section controls the mass flow rate of the power generation medium pump based on only one of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas and the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output.

### Claim 13 (depends on 12)

The binary power generation system according to claim 12, wherein
the control section compares a change amount of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas and a change amount of the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output, and controls the mass flow rate of the power generation medium pump based on a smallest change amount among the change amounts.

### Claim 14 (depends on 7)

The binary power generation system according to claim 7, wherein
the control section controls the mass flow rate of the power generation medium pump based on only one of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas, the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output, and the mass flow rate of the power generation medium pump determined based on the supercooling degree instruction value and the supercooling degree.

### Claim 15 (depends on 14)

The binary power generation system according to claim 14, wherein
the control section controls the cooling medium pump based on the supercooling degree instruction value and the supercooling degree, compares a change amount of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas, a change amount of the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output, and a change amount of the mass flow rate of the power generation medium pump determined based on the supercooling degree instruction value and the supercooling degree, and adjusts the mass flow rate of the power generation medium pump based on a smallest change amount among the change amounts.

### Claim 16 (depends on 10)

The binary power generation system according to claim 10, wherein
the control section controls the mass flow rate of the power generation medium pump based on only one of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas, the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output, the mass flow rate of the power generation medium pump determined based on the supercooling degree instruction value and the supercooling degree, the mass flow rate of the power generation medium pump determined based on the level instruction value and the current amount of liquid, and the mass flow rate of the power generation medium pump determined based on the superheating degree instruction value and the superheating degree.

### Claim 17 (depends on 16)

The binary power generation system according to claim 16, wherein
the control section controls the cooling medium pump based on the supercooling degree instruction value and the supercooling degree, compares a change amount of the mass flow rate of the power generation medium pump determined based on the dew point temperature and the exhaust temperature of the exhaust gas, a change amount of the mass flow rate of the power generation medium pump determined based on the output instruction value and the current output, a change amount of the mass flow rate of the power generation medium pump determined based on the supercooling degree instruction value and the supercooling degree, a change amount of the mass flow rate of the power generation medium pump determined based on the level instruction value and the current amount of liquid, and a change amount of the mass flow rate of the power generation medium pump determined based on the superheating degree instruction value and the superheating degree, and adjusts the mass flow rate of the power generation medium pump based on a smallest change amount among the change amounts.

### Claim 18 (depends on 1)

The binary power generation system according to claim 1, wherein
the binary power generation system is a power generation system for a ship and is provided in the ship.

### Claim 19

A control apparatus that controls a binary power generation apparatus generating power by vaporizing a power generation medium using heat of exhaust gas output from a drive apparatus, wherein
the control apparatus controls a mass flow rate of the power generation medium based on at least a sulfur concentration of the exhaust gas.

### Claim 20 (depends on 19)

A non-transitory computer-readable storage medium storing thereon a program that causes a computer to function as the control apparatus according to claim 19.