A generic input-output approach in developing and optimizing an Aspen plus steam-gasification model for biomass

Area of Science:

• Chemical Engineering
• Renewable Energy
• Biomass Conversion

Background:

• Steam-gasification is a key process for producing hydrogen-rich syngas.
• Optimizing steam-gasification is crucial for maximizing energy recovery and efficiency from biomass.

Purpose of the Study:

• To develop and present an equilibrium steam-gasification model in Aspen Plus.
• To investigate the effects of input variables on cold gas efficiency (CGE) and lower heating value (LHV).
• To optimize the steam-gasification process for various biomass types using Response Surface Methodology (RSM).

Main Methods:

• Development of an equilibrium steam-gasification model using Aspen Plus.
• Application of Response Surface Methodology (RSM) for process optimization.
• Analysis of synchronized effects of input variables on CGE and LHV.

Main Results:

• Identified optimal operating conditions for steam-gasification: steam to biomass ratio of 0.7 and gasification temperature between 780-790°C.
• Achieved nearly 100% desirability (D) for the optimized process.
• Framed generic relations to estimate CGE and LHV for different biomass feeds at optimum conditions.

Conclusions:

• The developed model and optimization strategy effectively enhance steam-gasification performance.
• Optimal conditions significantly improve cold gas efficiency and lower heating value.
• The study provides a framework for efficient biomass-to-syngas conversion.