STABILITY ANALYSIS OF MHD DISK GENERATORS AND APPLICATION TO POWER-SYSTEMS WITH CO2 RECOVERY

Preliminary design and stability analyses of magnetohydrodynamic (MHD) disk generators have been carried out. These are used in electric pow er-generation systems with CO2 recovery. Inflow disk channels show bet ter performance than outflow disk channels. An inflow channel with sup ersonic flow shows an enthalpy extraction ratio of 20.2% when the ther mal input is 1100 MW and the magnetic field is 8T. The calculated enth alpy extraction is 23.5% with 2000 MW and 10 T. A stability analysis h as shown that it is possible to stabilize the open-cycle disk channels , although the channels tend to become unstable at the exit region whe n they are operated with 10 T. Cycle analyses have been carried out fo r an electric power system in which coal is burnt with 95% oxygen and CO2 is recovered as liquid. A high cycle efficiency of 43% (higher hea ting value, HHV) can be obtained for a thermal input of about 1000 MW and magnetic field of 8 T while 46% HHV results from the system with a bout 2000 MW and 10 T, even when the power required for CO2 liquefacti on is considered. Copyright (C) 1996 Elsevier Science Ltd.