Economics Evaluation of Electricity Generation from Rice Residues and Study of Gold Catalysts for Selective Oxidation of CO in H2-rich Stream
Date Issued
2004
Date
2004
Author(s)
Yang, Chien-Pang
DOI
zh-TW
Abstract
Crop residues after harvest are treated as one kind of biomass. Biomass energy, one of circulating renewable energy resources, is utilized as electricity power or thermal energy converted from chemical energy stored in organism bodies and its net emission of carbon dioxide is zero. Gasification of rice residues generates electricity and remains rice ash as byproduct. The capacity of a rice straw power plant depends on its overall efficiency and is between 10.83 and 64.98 MW. This work scales up and takes economic estimation for building a large-scale rice straw power plant based on an available small-scale 100 kW rice husk power plant. The results reveal that a rice straw power plant has net profit while the cost of rice ash is over 4,594 NTD/ton besides the profit of electricity.
In 2000, all the rice husk and straw with yield of 318,312 and 1,334,240 tons respectively in Taiwan were utilized for power generation. The potential of electricity generation was 367,233,649 kWh, which is 0.22% of total electricity generation. And the potential of reduction of emission of carbon dioxide was 313,985 ton, which is 0.14% of total emission.
Fuel cell fed hydrogen provides clean energy with high efficiency and no pollution. In order to remove carbon monoxide in H2-rich gas stream to prevent electrode from poisoning, we introduces a selective catalytic oxidation system. Simulation of thermodynamic equilibrium in H2-rich gas composition shows that it is preferred for CO oxidation in equilibrium at fuel cell operating temperature and water vapor suppresses H2 oxidation. Selective CO oxidation reactions are carried out with four gold supported catalysts prepared by the same processes, including Au/Y, Au/γ-Al2O3, Au/AlPO4-5 and Au/MgO. Under the same reaction conditions, Au/γ-Al2O3 exhibits high CO conversion of 90% with good stability and Au/MgO exhibits high selectivity of 100%.
Subjects
生質能
稻作殘體
氫
稻殼
氣化
經濟評估
催化燃燒
發電
燃料電池
一氧化碳氧化
金觸媒
fuel cell
CO
biomass energy
gold catalyst
H2
economics evaluation
gasification
hydrogen
residue
catalytic combustion
monoxide
rice husk
power generation
Type
thesis
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