Abstract
Abstract The present study aims at studying the supercritical water gasification (SCWG) of leftover Brazilian ginseng roots after phytochemicals extraction for synthetic natural gas (SNG) production, envisioning the development of a promising Brazilian ginseng roots valorization using sub/supercritical fluids in different steps. A multi-objective energetic-economic-environmental optimization of the proposed SCWG process was assessed through the use of computational simulation tools. The results showed that, for a given leftover biomass input of 20MW, a specific cost of 62-66 USD/MWh of SNG is obtained, which is higher than the average price on the Brazilian market. On the other hand, the production process of SNG from this residue showed to be a promising option, being energetically self-sufficient and environmentally friendly. In order for this alternative process to become more economically attractive we proposed the construction of the SCWG and the sub/supercritical extraction units in the same location, sharing part of the same high-pressure equipment.
Highlights
During recent years, the interest on biomass utilization for power generation has increased since it has significant environmental benefits
Different types of liquid fuels can be synthesized from the produced synthetic natural gas (SNG), such as Fischer-Tropsch crude fuel, dimethyl ether and methanol, to generate renewable fuels to substitute fossil fuels, especially in the transportation sector which is responsible for a large part of the global CO2 emissions
The present study aims at evaluating the supercritical water gasification (SCWG) of leftover Brazilian ginseng roots after phytochemicals recovery for SNG production by computational simulation through the use of a multiobjective energetic-economic-environmental optimization for the SCWG process, envisioning the development of a novel Brazilian ginseng roots valorization using sub/ supercritical fluids during all the plant material processing
Summary
The interest on biomass utilization for power generation has increased since it has significant environmental benefits. It is an abundant resource that could provide renewable energy with low SO2 and CO2 emissions, contributing positively to limit the greenhouse effect. Gasification combined with a gas engine or gas turbine has the advantage of having a higher electric efficiency and lower electricity production costs than direct combustion (Bridgewater, 1995). Different types of liquid fuels can be synthesized from the produced synthetic natural gas (SNG), such as Fischer-Tropsch crude fuel, dimethyl ether and methanol, to generate renewable fuels to substitute fossil fuels, especially in the transportation sector which is responsible for a large part of the global CO2 emissions.
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