Turbo-compound reheat combined cycle power generation
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02B-063/00
F02B-073/00
F02C-006/12
F02B-077/13
F02B-063/04
F02B-075/16
출원번호
US-0304089
(2014-06-13)
등록번호
US-9249723
(2016-02-02)
발명자
/ 주소
Gülen, Seyfettin C.
출원인 / 주소
Bechtel Power Corporation
대리인 / 주소
Duane Morris LLP
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
A power generation plant has two internal combustion engines (ICE) coupled in a compound configuration to operate electrical generators. A first ICE is a piston/cylinder engine producing high temperature and high pressure exhaust. The exhaust is coupled to the combustion air inlet of the second ICE,
A power generation plant has two internal combustion engines (ICE) coupled in a compound configuration to operate electrical generators. A first ICE is a piston/cylinder engine producing high temperature and high pressure exhaust. The exhaust is coupled to the combustion air inlet of the second ICE, which is a gas turbine engine. A heat exchanger transfers heat from the exhaust of the first ICE to a bottoming cycle for additional power generation, also reducing the temperature at the turbine engine combustor. The second ICE (the gas turbine) is operated without an intake compressor, relying instead on the high pressure of the first ICE exhaust. The drive shaft of the gas turbine (or an associated generator/motor or a common shaft) operates a multi-stage turbo-compressor at the combustion air intake of the first ICE for improving engine power output without sapping exhaust energy as with a turbocharger.
대표청구항▼
1. A power generation plant, comprising: a first internal combustion engine (ICE) coupled to a combustion air intake and operable to combust fuel in a discontinuous flow configuration within a confined volume, wherein the first ICE produces shaft torque and exhaust gas from combustion of the fuel;a
1. A power generation plant, comprising: a first internal combustion engine (ICE) coupled to a combustion air intake and operable to combust fuel in a discontinuous flow configuration within a confined volume, wherein the first ICE produces shaft torque and exhaust gas from combustion of the fuel;a second internal combustion engine (ICE) operable to combust fuel in a steady-flow configuration, wherein an intake to the second ICE is coupled to the exhaust gas from the first ICE such that combustion gases at an intake to the second ICE are pressurized by the exhaust gas from the first ICE, wherein the second ICE produces shaft torque from expansion of the combustion gases, and exhaust gas from the second ICE has a temperature and a pressure that are reduced by said expansion of the combustion gases;a bottoming cycle coupled to at least one of the first and second ICEs, the bottoming cycle producing shaft torque by extracting heat energy from at least one of the exhaust gas from the first ICE and the exhaust gas from the second ICE;wherein at least one heat exchanger is coupled to transfer to the bottoming cycle heat energy from the exhaust gas from the first ICE;wherein the second ICE comprises a gas turbine configuration consisting essentially of a combustor and expander without an intake compressor, and wherein said expansion of the combustion gases in the second ICE produces an exhaust pressure and temperature that are lower than a temperature and pressure of the exhaust of the first ICE; and,wherein the shaft torques produced by the first and second ICE and by the bottoming cycle, respectively, are coupled to at least one electric power generator. 2. The power generation plant of claim 1, further comprising a turbo-compressor coupled to the combustion air intake of the first ICE, wherein the turbo-compressor is driven at least indirectly from the shaft torque from at least one of the first ICE and the second ICE. 3. The power generation plant of claim 2, wherein the turbo-compressor is coupled to a common shaft with the second ICE for applying the shaft torque from the second ICE to compression of the combustion air intake of the first ICE. 4. The power generation plant of claim 1, wherein the electric generator is coupled to a motor for driving the turbo-compressor. 5. The power generation plant of claim 1, wherein the first ICE comprises a piston/cylinder engine and the second ICE comprise a gas turbine. 6. A power generation plant, comprising: a first internal combustion engine (ICE) comprising a piston/cylinder engine, and a second internal combustion engine (ICE) comprising a gas turbine, wherein the first ICE and second ICE are coupled in a compound configuration wherein exhaust from the first ICE is coupled directly into an intake of the second ICE and provides gas flow to the second ICE;a bottoming cycle coupled to convert heat energy from at least an exhaust from the first ICE into shaft torque;wherein the first ICE and second ICE provide shaft torque from combustion of fuel; and,wherein the shaft torque from the first ICE, the second ICE and the bottoming cycle are coupled to at least one electric generator for generation of electric power. 7. The power generation plant of claim 6, further comprising a heat exchanger coupled between the first ICE and the combustor of the second ICE, the heat exchanger being configured to extract heat energy from the exhaust gas from the first ICE while maintaining a pressure thereof, and wherein the heat exchanger is coupled to supply said heat energy to the bottoming cycle. 8. The power generation plant of claim 2, wherein the turbo-compressor comprises plural compression stages and at least one of an inter-cooler between the stages and an after-cooler between the turbo-compressor and the first ICE. 9. The power generation plant of claim 6, wherein the bottoming cycle is coupled to convert heat energy from both the exhaust from the first ICE, and the exhaust from the second ICE, into said shaft torque. 10. A method for power generation, comprising: providing a piston/cylinder first internal combustion engine (ICE) operable to produce an exhaust flow at elevated temperature and elevated pressure by combustion of air and fuel in a quasi-constant volume space, while generating mechanical torque on a first drive shaft;coupling a gas turbine second internal combustion engine (ICE) to the first ICE in a compound configuration wherein a combustor of the second ICE is supplied with the exhaust flow from the first ICE in lieu of combustion air at said elevated pressure in which the second ICE combusts fuel, wherein the second ICE has a gas expansion section coupled to the combustor for generating mechanical torque on a second drive shaft from combustion in the second ICE, said expansion section reducing the temperature and pressure of combustion gas leading to an exhaust from the second ICE;providing the exhaust flow from the first ICE to an inlet of the combustor of the second ICE, through a heat exchanger that extracts heat energy from the exhaust flow from the first ICE, thereby conserving the elevated pressure of the exhaust flow from the first ICE while limiting the elevated temperature of the exhaust flow at the inlet to the combustor;driving a turbo-compressor from at least one of the first and second drive shafts for elevating a pressure of the combustion air at an intake to the first ICE;transferring heat energy to a bottoming cycle, via the heat exchanger that extracts heat energy from the exhaust flow of the first ICE, and from the exhaust of the second ICE;generating mechanical torque on a third drive shaft from said heat energy transferred to the bottoming cycle; and,generating electrical power from the first, second and third drive shafts. 11. The method of claim 10, wherein said coupling of the gas turbine second ICE and the piston/cylinder first ICE in the compound configuration comprises connecting a combustion air intake of the combustor of the second ICE to an exhaust flow path of the first ICE without an intervening compressor, whereby the exhaust flow at the elevated pressure replaces compressed combustion air at an intake to the combustor. 12. The method of claim 10, wherein said coupling of the gas turbine second ICE and the piston/cylinder first ICE in the compound configuration comprises coupling the turbo-compressor to the first ICE without use of a turbocharger powered by the first ICE and powering the turbo-compressor by the second ICE for compressing a combustion gas intake of the first ICE. 13. The method of claim 10, wherein at least two of the first, second and third drive shafts are commonly coupled by at least one of a direct connection and a transmission. 14. The method of claim 10, wherein the temperature of the exhaust flow gas from the first ICE is above an ignition temperature of the fuel provided to the second ICE, and the heat exchanger is configured to reduce the temperature of the exhaust to below the ignition temperature, at the combustion gas inlet of the combustor of the second ICE. 15. The method of claim 14, comprising use of natural gas as the fuel in both the first ICE and the combustor of the second ICE. 16. The method of claim 10, further comprising extracting heat energy from the turbo-compressor using at least one cooler, and applying a portion of air compressed by the turbo-compressor to component cooling at the second ICE.
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