A part-load analysis and control strategies for the Graz Cycle

Carbon capture and storage (CCS) plays a uniquely important role in the future clean dispatchable power generation portfolio to achieve ambitious goals set at COP21. The Graz Cycle, zero emission oxy-combustion plant, is one of most promising representatives CCS plants. present work introduces different control strategies for Cycle corresponding part-load performances. process simulation composed design-point (full-load) off-design (part-load) cycle. In order do this, tool IPSEpro was used. Individual cycle components were modelled both investigations, full load part load, developed optimum performances operating efficiencies by means assumptions given. This distinguishes from previous studies development comparison simulation, nominal design conditions achieved net plant efficiency 53.1%. generated results down 40% applying three strategies. These operation modes differ each other two basic parameters, boiler pressure turbine inlet temperature. Optimum strategy, where heat recovery steam generator allowed vary. However, e.g. costs, did not appear be favourable this mode. with readily available technology, such as natural gas combined cycle, showed that more efficient loads are reduced below 50%.