What is fluidized bed gasification?
Operation. Fluidized-bed gasifiers suspend feedstock particles in an oxygen-rich gas so the resulting bed within the gasifier acts as a fluid. These gasifiers employ back-mixing, and efficiently mix feed coal particles with coal particles already undergoing gasification.
What are the steps involved in gasification?
Gasification is made up for five discrete thermal processes: Drying, Pyrolysis, Combustion, Cracking, and Reduction.
What are major steps main processes of biomass gasification?
Gasification occurs in a set of four steps: drying, pyrolysis, oxidation and reduction [12]. Drying process removes water in the biomass and converts it into steam. The steam produced by drying process can lead the thermal decomposition of biomass into bio-syngas.
What are the three types of fluidized bed gasifiers used?
Explanation: Circulating fluidized bed, dual fluidized bed and bubbling fluidized bed are the three main types of fluidized gasifiers used. They are mainly used to achieve a uniform temperature distribution.
What are the advantages of fluidized bed gasifier?
The major advantages of fluidized-bed gasifiers include their fuel flexibility resulting from good mixing of feedstock and oxidant to ensure efficient heat and mass transfer, and their ability to deal with small particles.
What is biomass gasification and explain various stages of biomass gasification process?
Biomass gasification is known as the process that is employed to convert solid biomass into gaseous combustible gas known as producer gas, over classification of thermochemical reactions. The producer gas is low-heating value fuel having a calorific value ranging from 1000 to 1200 kcal/Nm3.
What is the temperature range in a fluidized bed gasification?
between 900 and 1050 °C
Fluidized- bed gasifiers typically operate at temperatures between 900 and 1050 °C, which is below the softening point of ash (Higman and van der Burgt, 2003).