SYSTEMATIC DESIGN ALGORITHM FOR ENERGY EFFICIENT AND COST EFFECTIVE HYDROGEN PRODUCTION FROM PALM WASTE
The energy crisis and environmental issues caused by fossil fuels usage have brought new light on hydrogen as a potentially significant form of energy in the future. The idea of producing hydrogen from oil palm biomass in Malaysia seems attractive due to the resource abundance. Biomass steam g...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://utpedia.utp.edu.my/21330/1/2012%20-CHEMICAL%20-%20SYSTEMATIC%20DESIGN%20ALGORITHAM%20FOR%20ENERGY%20EFFICIENT%20%26%20COST%20EFFECTIVE%20HYDROGEN%20PRODUCTION%20FROM%20PALM%20WASTE%20-%20ABRAR%20INAYAT.pdf http://utpedia.utp.edu.my/21330/ |
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| Summary: | The energy crisis and environmental issues caused by fossil fuels usage have brought
new light on hydrogen as a potentially significant form of energy in the future. The
idea of producing hydrogen from oil palm biomass in Malaysia seems attractive due
to the resource abundance. Biomass steam gasification with in-situ carbon dioxide
capture in the presence of catalyst has good prospects for the enhanced production of
hydrogen rich gas. Despite these potentials, its application at industrial scale is limited
due to the energy intensiveness, costs and hazards of gasification process at high
temperatures (>823K). Modelling and optimization become an increasingly attractive
design approach to investigate the gasification performance within an extensive range
of operating parameters. However, the existing design methods are limited to allow
simultaneous and integrated assessment of process performance, heat efficiency and
costs.
In the current study, a systematic autonomous algorithm incorporating reaction
kinetics model, flowsheet calculations, heat integration analysis and economic
evaluation, has been developed to calculate optimum parameters giving minimum
hydrogen production cost using optimization strategies. A simplified flowsheet has
been developed for hydrogen production from biomass via catalytic steam gasification
with in-situ carbon dioxide capture. A first order reaction kinetics model was next
developed to represent the reactions occurring in the gasification system. The heat
integration model based on mixed integer non-linear programming was also
developed to minimize the utility cost and heat exchanger area cost for the
gasification system to incorporate energy efficiency evaluation. A cost minimization
work on the ±1owsheet subject to the reaction kinetics behaviour, mass and energy
balances and minimum utility cost, to obtain the optimal parameters, has been
conducted. In addition, experimental work has been performed using a gasification
unit to obtain the reaction kinetics parameters. |
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