Gasification technologies meeting the definition proposed by the GTC offer an alternative process for the recovery and recycling of low-value, secondary materials by producing a more valuable commodity – syngas. The multiple uses of syngas (power production, chemicals, methanol, etc.) and the availability of gas clean-up technologies common to the petroleum refining industry make gasification o...

A technology assessment of thermal treatment technologies was carried out in the form of scenarios of chains of technologies. The Swedish tool, ORWARE was used for the assessment. The scenarios of chains of thermal technologies assessed were gasification with catalytic combustion, gasification with flame combustion, incineration and landfilling. The landfilling scenario was used a reference for...

In this work, a model of gasification process that enables all, material and energy balance, calculation of gas composition, gas heating value and reactor temperature is presented. The model parameters were estimated by laboratory experiments. A fraction of MSW generally separated from inorganic materials and biodegradable components, so called Refuse-derived fuel (RDF), was studied by material...

The main goal of the study was the analysis of the parameters of wastewater generated during the ex situ underground coal gasification (UCG) experiments on lignite from Belchatow, and hard coal from Ziemowit and Bobrek coal mines, simulated in the ex situ reactor. The UCG wastewater may pose a potential threat to the groundwater since it contains high concentrations of inorganic (i.e., ammonia ...

Combustion and Gasification are commercial processes of coal utilization, and therefore continuous improvement is needed for these applications. The difference between these processes is the reaction mechanism, in the case of combustion the reaction products are CO2 and H2O, whereas in the case of gasification the products are CO, H2 and CH4. In order to investigate these processes further, a s...

Canonical fluid dynamic analysis is applied to account for the contributing physical mechanisms and the order of magnitude of the transient moving droplet gasification rate based on energy and species conservation equation as eigenvalues in the general aerothermochemical environment. The results show surprisingly well coordinated self-organized thermofluidchemical mechanisms of dynamic evolutio...

underground coal gasification (ucg) is a non-conventional method of extracting gas from coal. the primary advantage of ucg is that it recovers gas from uneconomical or unminable coal, potentially increasing the value of the world’s coal reserves by an estimated 70%; for this reason, ucg has been implemented at sites around the world. however, the gaseous, liquid and solid waste streams which ac...

A model for steam gasification of biomass was developed by applying thermodynamic equilibrium calculations. With this model, the simulation of a decentralized combined heat and power station based on a dual fluidized-bed steam gasifier was carried out. Fuel composition (ultimate analysis and moisture content) and the operating parameters, temperature and amount of gasification agent, were varie...

This article describes modelling and simulation advances for the gasification systems. The generalized approach pursued in developing the models allows to characterize the main phenomena involved in the gasification process of coal, biomass and organic wastes. Actually, multi-scale, multi-phase, and multicomponent systems are described by means of complex kinetic mechanisms for gas-solid phases...

Heightened concerns over the amount of carbon emitted from coal-related processes are generating shifts to the application of biomass. In co-gasification, where coal is gasified along with biomass, the biomass may be fed together with coal (cofeeding) or an independent biomass gasifier needs to be integrated with the coal gasifier. The main aim of this work is to evaluate the biomass introducti...