Thermal gasification or direct combustion? Comparison of advanced cogeneration systems in the sugarcane industry

摘要: Abstract We compare different cogeneration system scenarios for efficient energy production from bagasse fuel in an Indonesian sugar and ethanol factory. These include the use of condensing-extraction steam turbines, variable speed electric drives process equipment, measures to reduce low pressure demand needs, two advanced systems. One includes 80 bar high direct combustion Rankine cycle (advanced SRC), while other uses a biomass integrated gasifier combined (BIGCC); both utilize dryers. Using steady-state thermodynamic models, we estimate that net electricity generation potentials BIGCC SRC systems are approximately seven five times potential existing factory, respectively. The maximum respective 170 kWh/tc (BIGCC) 140 kWh/tc SRC). However, needs feed rate is 50 percent higher than satisfy factory processing, which may affect its ability provide during off-season. For annual revenue US$14 million per year, (electricity sale rate: US$45/MsWh; carbon credit price: US$13.60). technology still early stage development there no commercial factories, so be more suitable option near future.