초록 ▼

An integrated steam-ammonia power cycle is disclosed which achieves a close match to a glide heat source such as exhaust from a gas turbine, and which also eliminates sub-atmospheric pressure operation. With reference to FIG. 1, the exhaust heats in sequence steam superheater 107; steam boiler 105;

An integrated steam-ammonia power cycle is disclosed which achieves a close match to a glide heat source such as exhaust from a gas turbine, and which also eliminates sub-atmospheric pressure operation. With reference to FIG. 1, the exhaust heats in sequence steam superheater 107; steam boiler 105; feedwater preheater 104 plus ammonia superheater 103; and ammonia preheater 102. Steam is expanded to at least 17 psia in turbine 108, then condensed to boil ammonia in boiler 110. Superheated ammonia is expanded in turbine 112, and condensed in condenser 114. Feed ammonia is preheated in at least two parallel preheaters.

대표청구항 ▼

1. An integrated steam-ammonia power cycle for a gas turbine combined cycle plant, said plant comprised of a gas turbine, an exhaust heated steam boiler, a steam superheater and a steam turbine, said power cycle additionally comprised of:a) a steam condenser/ammonia boiler; b) an ammonia superheater

1. An integrated steam-ammonia power cycle for a gas turbine combined cycle plant, said plant comprised of a gas turbine, an exhaust heated steam boiler, a steam superheater and a steam turbine, said power cycle additionally comprised of:a) a steam condenser/ammonia boiler; b) an ammonia superheater, and a feedwater preheater which are heated by said exhaust after said steam boiler; c) an ammonia turbine, condenser, and feed pump; and d) an ammonia feed preheater which is heated by said exhaust after said feedwater preheater and ammonia superheater. 2. The cycle according to claim 1 additionally comprised of a parallel ammonia feed preheater which is heated by exhaust vapor from said ammonia turbine, plus a feed splitter which proportions feed between said ammonia preheaters.3. The cycle according to claim 1 additionally comprised of a parallel feedwater preheater which is heated by exhaust vapor from said steam turbine, plus a feedwater splitter which proportions feedwater between said preheaters.4. The cycle according to claim 1 additionally comprised of a second ammonia superheater which is heated by exhaust vapor from said steam turbine.5. The cycle according to claim 1 additionally comprised of a steam reheater which reheats the exit steam from said steam turbine by said exhaust before said boiler, and a second steam turbine which work expands said reheat steam and discharges it to said steam condenser/ammonia boiler.6. The cycle according to claim 1 additionally comprised of parallel feed preheaters heated by different sources plus a splitter for both the feedwater and the ammonia feed.7. The cycle according to claim 1 additionally comprised of a second ammonia turbine which is supplied with the same pressure and a lower superheat temperature than said ammonia turbine.8. The cycle according to claim 1 wherein said ammonia condenser is air-cooled.9. The cycle according to claim 1 wherein said ammonia condenser is evaporatively-cooled.10. A power plant comprised of:a) a gas turbine; b) a heat recovery unit for the exhaust gas from said gas turbine, said heat recovery unit (HRU) comprised of in order from hot end to cold end: i. a steam superheater; ii. a steam boiler; and iii. an ammonia superheater and feedwater heater; c) a steam turbine which is supplied said superheated steam; d) a steam condenser/ammonia boiler for the exhaust from a steam turbine; e) an ammonia turbine which is supplied said superheated ammonia; and f) an ammonia condenser. 11. The power plant according to claim 10 additionally comprised of an ammonia feed pump plus an ammonia feed heater at the cold end of said HRU.12. The power plant according to claim 10 additionally comprised of an ammonia feed heater for at least part of said ammonia feed, which exchanges heat with the exhaust from said ammonia turbine.13. The power plant according to claim 10 additionally comprised of a second feedwater heater for heating part of said feedwater by heat exchange with exhaust from said steam turbine, before said condensing.14. The power plant according to claim 10 additionally comprised of a steam reheater in said HRU in a hotter section than said steam boiler, and a second steam turbine for said reheated steam, said steam reheater being supplied from said first steam turbine exhaust.15. The power plant according to claim 14 additionally comprised of a second feedwater heater for heating part of said feedwater by heat exchange with exhaust from said second steam turbine, before condensing said exhaust in said condenser/evaporator.16. The power plant according to claim 10 additionally comprised of a second ammonia superheater in said HRU in a hotter section than said steam boiler, and a second ammonia turbine.17. The power plant according to claim 10 additionally comprised of a second ammonia turbine which is supplied with superheated ammonia from heat exchange with the exhaust of said first ammonia turbine.18. A process for producing power from a hot combustion gaseous exhaust comprising:a) heating in sequence a steam superheater, a steam boiler, an ammonia vapor superheater, and an ammonia economizer by said exhaust; b) expanding said steam in a power producing turbine to a super-atmospheric pressure between 17 and 35 psia; c) condensing said expanded steam by boiling ammonia at a pressure between 600 and 1500 psia; d) superheating said boiled ammonia in said heating step; and e) expanding said superheated ammonia in a power producing ammonia turbine to a pressure between 100 and 280 psia. 19. The process according to claim 18 wherein said steam expanding step is in at least two stages, and comprising at least one steam reheating step between the expanding stages.20. The process according to claim 18 additionally comprising heating feedwater in parallel with said ammonia superheating step.21. The process according to claim 18 additionally comprising maintaining at least about 20 ppm to 5000 ppm steam in said ammonia vapor.22. An integrated steam-ammonia power cycle for a gas turbine combined cycle plant, said plant comprised of a gas turbine, an exhaust heated steam boiler, a steam superheater and a steam turbine, said power cycle additionally comprised of;a) a steam condenser/ammonia boiler: b) an ammonia superheater, and a feedwater preheater which are heated by said exhaust after said steam boiler; c) an ammonia turbine, condenser, and feed pump; d) an ammonia feed preheater which is heated by said exhaust after said feedwater preheater and ammonia superheater; and e) a second ammonia turbine which is supplied the same pressure and a lower superheat temperature than said ammonia turbine.