POWER GENERATION SYSTEM AND METHOD TO OPERATE

摘要

A method to operate a power generation system and the device itself includes an oxy-fuel burner, a first heat exchanger assembly, and a rankine-cycle. The oxy-fuel burner generates an exhaust fluid submitted to an exhaust fluid line and the rankine-cycle is operated with the working media which is circulating separately from the exhaust fluid. The exhaust fluid line is provided with a recirculation line downstream the first heat exchanger assembly and upstream the working media heat exchanger extracting exhaust fluid from the exhaust fluid line, conducting extracted exhaust fluid to a compression unit to increase pressure and injecting downstream the extracted exhaust fluid into the oxy-fuel burner.

主权项

1. A power generation system (PGS) comprising
an oxy-fuel burner (OXB), a first heat exchanger assembly (HEA1), a rankine-cycle (RC), wherein said rankine-cycle (RC) comprises at least one turbine (ST) for expansion of a working media (PF), downstream said turbine (ST) at least one condenser (CON) for condensing of said working media (PF), wherein said rankine-cycle (RC) comprises downstream said condenser (CON) at least one first working media pump (FWP1) delivering said working media (PF) to a higher pressure level, wherein said rankine-cycle (RC) comprises downstream said first working media pump (FWP1) at least one first working media pre-heater (PH1) heating said working media (PF) by extracted working media (XPF2) from said turbine (ST), wherein downstream said first working media pre-heater (PH1) said working media (PF) passes said first heat exchanger assembly (HEA1) to be boiled and superheated, wherein said oxy-fuel burner (OXB) generates an exhaust fluid (EXH) by combustion of fuel (F) and oxygen enriched gas (O2), wherein a first part (EXH1) of said exhaust fluid (EXH) is provided to an exhaust fluid line branch (EXLB) and a second part (EXH2) of said exhaust fluid (EXH) is provided for recirculation to said oxy-fuel burner (OXB), wherein said rankine-cycle (RC) is operated with said working media (PF) which is circulating separately from said exhaust fluid (EXH), wherein said first part (EXH1) of said exhaust fluid (EXH) is provided to at least one working media heat exchanger (FWE) that is provided to heat up said working media (PF) of said rankine-cycle (RC) downstream said first working media pump (FWP1) and upstream said first working media pre-heater (PH1) by said first part (EXH1) of said exhaust fluid (EXH), wherein said second part (EXH2) of said exhaust fluid (EXH) is provided downstream of heat exchangers of said first heat exchanger assembly (HEA1) to a compression unit (PU) to increase pressure of said second part (EXH2) in order to re-inject said second part (EXH2) into said oxy-fuel burner (OXB).