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In the previous work, the multi-scale chemical reaction model was developed by Wang et al. (2014) to consider the impact of the meso-scale structure on reaction performance. This paper incorporates multi-scale heat transfer to further improve the previous multi-scale chemical reaction model. The temperature field in the cluster phase and the dispersed phase is predicted. A cluster structure-dependent...
A pilot-scale 25kg/h fluidized bed, oxygen/steam blown gasifier and syngas cleaning system was developed to convert switchgrass into clean syngas. The system is rated for operation at gage pressures up to 1bar. The reactor vessel incorporated a novel guard heating system to simulate near-adiabatic operation of large commercial-scale gasifiers, and was effective for gasification temperatures up to...
In this study, fresh soybean oil (FSO) and waste soybean oil (WSO) were gasified with air in a bench-scale fluidized bed reactor equipped with a tar removal system. The objective of this work was to study the effect of the Equivalence Ratio (ER) on gas composition for producing producer gas and tar content. Furthermore, the gas compositions from the gasification of FSO and WSO were compared in order...
Gasification is a key process for the thermochemical conversion of coal for both energetic utilization and its application as a chemical feedstock. In this regard low grade coal with high-ash content gains in importance. Because of its high availability, production share is increasing. Therefore, adapted gasifiers of novel design are required to meet the demands associated with converting high-ash...
Co-firing biomass and coal under oxy-fuel combustion in a circulating fluidized bed combustor (CFBC) holds the potential for negative CO2 emission into the atmosphere and is a promising technology to realized atmospheric CO2 reduction. Experiments co-firing coal and three kinds of Chinese biomass, i.e. rice husk (RH), wood chips (WC) and dry wood flour (WF) under oxy-fuel condition were carried out...
This paper studies the adsorption process behavior of SO 2 removal in one fluidized bed reactor which is filled with aluminum oxide catalysts. The performance of catalytic bed is analyzed experimentally and theoretically in this work. Sulfur elimination from gas is the major purpose of the handled experiments. The influence of bed height, bed width, diameter of aluminum oxide particles which...
Fast pyrolysis is an effective means of converting solid low-energy density biomass to intermediate energy products, such as bio-oil. In this study, computational fluid dynamics (CFD) simulations of the biomass fast pyrolysis processes in both the fluidized-bed and the auger reactors were conducted. The numerical results were validated by experimental data. Materials of all phases were modeled as...
A novel method is presented for experimental study of gas-particle reactions, based on realizing a well-stirred reactor as a small scale fluidized bed. This reactor is evaluated against the drop tube reactor and the thermo-gravimetric analyser. It shows to enable high heat up rates (∼104K/s), long timescale observation (up to several hours), operation with small fuel particles (∼100μm) and accurate...
To improve the knowledge about pyrolysis behavior of reed black liquor (RBL), reed black liquor particles (RBLP) pyrolysis experiments were performed in nitrogen atmosphere at 530, 580, 630, 680, 730 and 780°C in fluidized bed at atmospheric pressure. The effects of bed temperature on yields of pyrolysis product, gaseous product characteristics, carbon and hydrogen conversions, NOx and SO2 emissions,...
Gas and particle emissions from co-firing coal and two types of biomass versus coal was evaluated in a circulating fluidized bed boiler operating with a constant energy input. Compared to coal, co-firing 50% oat hulls (by weight) significantly reduced the emission of particulate matter (PM) by 90%, polycyclic aromatic hydrocarbons (PAH) by 40%, metals by 65%, and fossil carbon dioxide by 40%. In contrast,...
The use of Ca-based sorbents in circulating fluidized beds (CFB) allows the in-situ desulfurization in oxy-fuel combustion processes. The sulfation process involves important changes in the sorbent morphology, which could vary depending on the operating conditions and be different to those observed in conventional air combustion. This work analyzes the morphological variations observed during limestone...
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