In this paper computational analysis of circulating fluidized bed combustion using the fluent software is analysed. This work is concerned about gas–solid two-phase mixtures flowing upwards through the fast beds. The procedures studied are applicable to all types of fluidized-bed boilers. The type of information resulting from various ways of analyzing the pressure and temperature in fluidized ...

The goal of this research is to determine how spectral analysis of pressure fluctuations can be used as a diagnostic and design tool for both bubbling fluidized beds (BFB) and circulating fluidized beds (CFB). Static pressure fluctuations are measured from two BFB models, two CFB models, and two Pyropower CFB boilers located at the ISU power plant/cogeneration facility. Analyzing the fluctuatio...

In this work, the techno-economic and exergy analyses of two gasification technologies with integration into heat power combined cycles are presented: i). Circulating fluidized bed (CFB) ii). Dual (DFB) systems. As feedstock, lignocellulosic biomass (sugarcane bagasse, SCB) was considered . The process fluidized-bed systems (circulating dual bed) syngas conversion were performed using Aspen Plu...

The fluidization in the furnace of circulating fluidized bed (CFB) boilers is described. Data have been obtained from a 12 MWth CFB boiler and literature. bottom bubbling rather than fast or turbulently as often assumed. There an extended splash zone above this bed, which particles are thrown up by bubbles fall back onto bed. Other carried further into transport zone, initially saturated gas fl...

Fuel feeding and inhomogeneity of fuel typically cause process fluctuations in the circulating fluidized bed (CFB) process. If control systems fail to compensate for the fluctuations, the whole plant will suffer from fluctuations that are reinforced by the closed-loop controls. This phenomenon causes a reduction of efficiency and lifetime of process components. Therefore, domain experts are int...

To make full use of the circulating fluidized bed fly (CFB-FA), rich-water carbide slag was used as alkali-activator to promote hydration CFB-FA and prepare fly-based geopolymer (CFB-FAG). The fundamental properties, mechanical acid alkali-resistance CFB-FAG were investigated. optimum content is 25%. it indicates that can excellent properties without high-temperature heat treatment. alkali resi...

One of the major advantages of circulating fluidized bed (CFB) combustors is their efficiency for the combustion of wide variety of solid fuels. From this point of view, in this study, the combustor efficiency has been defined and investigated for CFB biomass combustor based on the losses using a dynamic 2D model. The model is shown to agree well with the published data. The combustion efficien...

Comparative tests in air and oxy-fuel combustion were conducted a 30 kWth circulating fluidized bed (CFB) pilot plant for waste sludge combustion. General characteristics of the CFB, such as pressure profiles, temperatures along bed, flue gas composition, different under conditions. At bottom fly ash, alkali heavy metals had distributions The particle size distribution ash from was dominated by...

This paper focuses on the determination of the solid circulation of a CFB gasification system with a dual fluidized bed concept and the distribution of the solid hold up at different fluidization conditions. A mathematical model of the riser was designed and implemented in a model of a dual fluidized bed system. This model contains routines for calculation of each section of the dual fluidized ...

Chemical looping gasification (CLG) is a novel dual-fluidized bed technology that allows for the production of high-calorific syngas from various solid feedstocks (e.g., biomass). Solid circulation between two coupled fluidized reactors, serving purpose heat and oxygen transport, key parameter CLG technology, making system hydrodynamics backbone process. This study serves to provide holistic in...