Circulating fluidized bed of biomass gasification: Product compound prediction by application of a constrained equilibrium model

Biomass as a renewable energy resource and a carbon neutral feedstock has a big potential to replace fossil fuel. Gasification as one of thermochemical process routes in biomass utilization draws attention with regards to its broad product range. The circulating fluidized bed with the advantages of higher and rapid conversion performs as the...

Artificial neural networks for determining the optimal process conditions of a gasification process

System modeling of supercritical water gasification processes: Thermo-fluid one-dimensional modeling in Modelica language

Supercritical water gasi?cation (SCWG) is a conversion process for wet biomass feedstock into synthetic natural gas at conditions above the critical point of water (220.9 bar and 374.15 °C). A high energy and conversion ef?ciency of the process is achieved by using supercritical water as a reaction medium which avoids the necessity of an energy...

Effect of mechanical fractionation and torrefaction on the biomass composition

In the Netherlands, green residues such as verge grass are a possible alternative to (partially) replace traditional fossil fuels. A feasible way of doing this, without large modification costs on existing power plants, is biomass co-firing. However, grass has high moisture content, poor grindability properties and high ash content, which have...

Modeling of waste to energy processes in an engineering environment

MSW is non hazardous and constitutes of biomass and plastics. Thermal conversion methods produce energy by utilizing the calorific value of these fuels, thus presenting opportunities to reduce the twin problems of waste disposal and energy shortage. However, the transition from coal to MSW causes several operational issues due to the difference...

Implementation of an organic rankine cycle in a biorefinery concept

A bio-refinery concept was defined with the Aspen software. This bio-refinery concept turns water hyacinth into furfural and syngas. Biomass undergoes a hydrolysis at 180ºC and 10 bars. The residues are processed in supercritical gasifier to produced syngas. This thesis aims at improving the energy efficiency of this concept by implementing an...

Wet torrefaction of verge grass - a pretreatment to enable co-firing in a coal power plant

Current energy production is done in a way that cannot be sustained ultimately. Biomass is ideal as a sustainable alternative because it can be used in the existing energy infrastructure. For coal power plants verge grass is one of the products being considered for co-firing. The moisture content and its bioactivity currently prevent direct co...

Modeling of the fate of alkali species in pulverized fuel (co-)combustion.

Simulations were performed concerning pf-combustion of biomass, coal and blends. The focus was on the fated alkali species; a novel reaction scheme was inplemented in the software package chemkin. Trends in the flue gas cooling path were predicted.