A high-energy-efficient process for empty fruit bunch drying with integration to gasification and
combined cycle processes is proposed. The enhancement is due to greater exergy recovery and more efficient
process integration. Basically, the energy/heat involved in a single process is recovered as much as
possible, leading to minimization of exergy destruction. In addition, the unrecoverable energy/heat is utilized
for other processes through process integration. During drying, a fluidized bed dryer with superheated
steam is used as the main evaporator. Exergy recovery is performed through exergy elevation
via compression and effective heat coupling in a dryer and heat exchangers. The dried empty fruit
bunches are gasified in a fluidized bed gasifier using air as the fluidizing gas. Furthermore, the produced
syngas is utilized as fuel in the combined cycle module. From process analysis, the proposed integrated
processes can achieve a relatively high energy efficiency. Compared to a standalone drying process
employing exergy recovery, the proposed integrated drying can reduce consumed energy by about 1/3.
In addition, the overall integrated processes can reach a total power generation efficiency of about 44%.
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