Sökning: "circulating fluidized beds"
Visar resultat 6 - 10 av 18 avhandlingar innehållade orden circulating fluidized beds.
6. Heat Transfer in Circulating Fluidized Bed Boilers
Sammanfattning : Heat transfer to single particles in the transport zone of circulating fluidized beds and heat transfer to membrane tube walls have been investigated. The heat transfer coefficient to spheres in the transport zone of a circulating fluidized bed boiler has been measured with dark and light calorimeters. LÄS MER
7. Solids flows in circulating fluidized beds: explorations of phenomena with applications to boilers
Sammanfattning : The circulating fluidized bed (CFB), which is a technology that is commonly used in the heat and power sector, efficiently converts renewable and/or and low-grade solid fuels, such as biomass and biogenic waste fractions. CFB units serve also as a technological platform for carbon capture processes (combustion by oxy-firing or chemical looping), which are foreseen to play a key role in the transition of the energy system towards decreased atmospheric CO2 emissions. LÄS MER
8. Heat and Mass Transfer to a Single Particle in Fluidized Bed
Sammanfattning : Heat and mass transfer to/from a single active particle in bubbling and circulating fluidized beds have been studied with application to fluidized bed combustion. A method of calculation of the heat and mass transfer coefficients in a bubbling fluidized bed (BFB) has been developed. LÄS MER
9. Macroscopic modeling of fluid dynamics in large-scale circultaing fluidized beds
Sammanfattning : Satisfactory knowledge of the fluid dynamics governing the gas-solid flow in large-scaleCirculating Fluidized Bed (CFB) units is still lacking, although the CFB technology is widelyused for power (and heat) generation. Due to the complex two-phase flow in large CFB unitsfluid dynamical modeling of practical use is so far limited to a macroscopic approach andavailable models generally focus in describing one of the following key-phenomena: maingas-solid flow pattern, mixing of fuel particles and gas mixing. LÄS MER
10. A Numerical Study of the Fluid Dynamics of Bubbling Fluidized Beds
Sammanfattning : The two-fluid model was evaluated as a tool for predicting local flow behaviour in bubbling fluidized beds. A review is given of the two-fluid model approach for simulation of the flow in bubbling fluidized beds. LÄS MER