What are fixed bed gasifiers?

Fixed bed gasifiers, which consist of a fixed bed of biomass through which the oxidation medium flows in updraft or downdraft configuration, are simple and reliable designs and can be used to gasify wet biomass economically on a small scale for CHP applications (Wang et al., 2008).

What does fluidized bed gasifier produce?

Conventional fluidized bed gasifier involves air and steam in a single reactor, which normally yields product gas consisting of nitrogen at a high concentration.

What are fluidised beds used for?

Fluidized beds are used for several purposes, such as fluidized bed reactors (types of chemical reactors), solids separation, fluid catalytic cracking, fluidized bed combustion, heat or mass transfer or interface modification, such as applying a coating onto solid items.

What is a fixed bed bioreactor?

Fixed-bed bioreactors, or FBBRs, are advanced biological wastewater treatment technologies used for efficiently treating wastewaters with high to extremely high organic contamination levels.

What are gasifiers?

Gasification is a technological process that can convert any carbonaceous (carbon-based) raw material such as coal into fuel gas, also known as synthesis gas (syngas for short). Composed primarily of the colorless, odorless, highly flammable gases carbon monoxide (CO) and hydrogen (H2), syngas has a variety of uses.

What is entrained flow gasifier?

In entrained-flow gasifiers, fine coal feed and the oxidant (air or oxygen) and/or steam are fed co-currently to the gasifier. This results in the oxidant and steam surrounding or entraining the coal particles as they flow through the gasifier in a dense cloud.

Where are fluidised beds used in industry?

Fluidized beds have been used in technological processes such as: cracking and reforming of hydrocarbons (oil), carbonization and gasification of coal, ore roasting, Fischer-Tropsch synthesis, polyethylene manufacturing, limestone calcining, aluminum anhydride production, granulation, vinil-chloride production.

What are the three types of fluidized 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.