ENERGY EFFICIENT DEWATERING TECHNOLOGY FOR WET BIOMASS FRACTIONATION
Mechanical fractionation processes of the wet biomass can be intensified through heat supply. After separation, the residual solid fraction, which is usable in animal feedings, must be dried to guarantee a good conservation. The thermally assisted mechanical dewatering (TAMD) is a new process for energy-efficient liquid/solids separation, which has the special feature to operate at low temperature (around 50℃). Pinch analysis is used to assess the opportunity to recover the energy from the exhaust gas of the dryer to heat the coolant flowing in the jacketed wall of the TAMD process. Data are extracted from experiments performed at the lab scale for the mechanical dewatering experiments and from literature for the drying unit operation. Heat and mass balances are established on the basis of 12.18 ton/h of dry matter, with a dry solid contents of 16％ at the TAMD process inlet and 54％ at the dryer inlet. Energy targets, for a 10℃ minimum temperature difference, were set algebraically thanks to the Problem Table method and the Pinch point located. The Pinch design method is finally used to design the heat exchanger network. Results emphasizes that significant energy profits can easily be obtained by recovering the heat load in the exhaust gas of the dryer, leading to an energy saving of 60％ on the overall separation chain.
Pinch Analysis Process integration Alfalfa Compression Heat Transfer
N. CUSSO GRAU P. ARLABOSSE
Université de Toulouse; Mines Albi; CNRS ; Campus Jarlard, F-81013 Albi, France Ecole des Mines Albi, Centre RAPSODEE, Campus Jarlard, F-81013 Albi, France
国际会议
北京
英文
1044-1049
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）