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In this study, a downdraft gasifier model is coupled with a single-particle model to analyze the effects of particle geometries such as slab, cylindrical, and spherical on different parameters. Simulations were performed using particles in a thermally thick regime with larger particle sizes of 0.003–0.05 m, which are generally used in commercial gasifiers. This combination of the downdraft gasifier...
The solar/autothermal hybrid gasifier (SAHG) is an attractive approach to provide continuous production of the syngas via coupling autothermal and solar gasification together, where the SAHG mainly includes fully solar, hybrid, and fully autothermal modes. An ICE CCHP system driven by the SAHG with an indirectly irradiative two-cavity reactor introduced conceptually and investigated thermodynamically...
The production of gas via bio-oil gasification, which would act as a bridge between bio-oil and transportation fuels, has been increasingly concerned. Bio-oil gasification was performed by using air - steam as gasifying agents. The effects of two important influential factors (steam to bio-oil ratio and gasifier temperature) on the quality of the product gas (gas composition, H2: CO, CO: CO2, tar...
The purpose of this study was to investigate the gasification properties of biomass chars obtained under different conditions by using non-isotherm thermogravimetric method. The physical and chemical structure features were also systematically studied. It shows that the gasification reactivities decrease with increasing pyrolysis temperature, and the gasification reactivities for the chars obtained...
The technical and economic prospects for synthesis gas production via an integrated biomass pyrolysis and gasification (IBPG) process are evaluated for the case where rice straw is a considered feedstock. Modeling of the integrated process is performed by using the Aspen Custom Modeler program. The simulation results show that the production rates of synthesis gas and bio-oil derived from an IBPG...
In a biomass gasification process, condensation of inorganic species can cause problems such as corrosion and deposition on the downstream equipment. In this work, in order to investigate the condensation of inorganics during the gas cooling step of the biomass gasification system, both experimental and modelling studies were conducted. Experiments were performed on a pilot-scale steam/oxygen blown...
The economic assessment of an integrated anaerobic digestion and gasification system for the exploitation of the residues from an urban sewage treatment plant is carried out. The obtained bio-fuels are used in a cogeneration unit to produce both electric and thermal energy.The analysis focuses on the water treatment plant of a touristic town, characterized by a highly variable number of inhabitants...
Recovery of waste heat in large industrial plants is nowadays an important topic of thermal optimization. In the present study, energy, exergy, and exergoeconomic analysis of an integrated system, Tehran's waste-to-energy power plant coupled with an organic Rankine cycle (ORC), is analyzed. Parametric study of essential parameters (moisture content, pinch point temperature differences of the HROG,...
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