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WorksheetsBiomass Combustion
Total questions: 15
Worksheet time: 11mins
In the combustion process, the fuel/biomass react with (a) to form the combustion products
Normally, for a chemical process, raw materials or reactants react to form reaction products consisting of the desired product (a new chemical) and the undesired/by-products. In the case of combustion, what is the main output desired?
(a)
For a complete combustion process, the fuel/biomass (containing carbon, hydrogen and oxygen atoms) react completely with the oxygen to produce?
Carbon dioxide
Water vapour
Sulphur dioxide
Hydrochroric acid
Identify which one of these is the correct order of the phases in a combustion process
Drying, degasification, gasification, combustion
Drying, gasification, degasification, combustion
Combustion, drying, degasification, gasification
Degasification, gasification, combustion, drying
One of the most important criteria for a combustion process is to have a fuel/biomass with low moisture content. What are the drawbacks of having a fuel with high moisture content?
Can cause incomplete combustion
Low overall thermal efficiencies of the boiler
Formation of tars
Less energy needed for the drying stage
Comparing between biomass and fossil fuels, which one have higher oxygen (O) content?
(a)
What are the functions needed for a combustion equipment?
To proportion and mix fuel and air
To initiate and maintain ignition
To volatilize the fuel
Combustion and emission control
Comparing different combustion technologies, which part of the system does not differ much from each other?
Steam turbines
Pre-treament
Flue-gas cleaning
Biomass power plants
What are the common category of boilers available in the market?
Fixed bed
Fluidized bed
Dust combustion
Transforming grate
Which type of boiler can be used to produce a thermal capacity of up to 500 MW?
Moving grate fixed bed
Underfeed stoker fixed bed
Bubbling fluidized bed
Circulating fluidized bed
Identify the available types of moving grates.
Chain grate
Reciprocating grate
Vibrating grate
Transforming grate
In terms of better flexibility, stability and efficiency, which technology is the best?
Fixed bed
Fluidized bed
Dust combustion
Suspension combustion
Constituent of ash formed, react with flue gases forming a variety of compounds which form deposits on the surface of cooled furnace wall leading to slagging and fouling. Where does slagging specifically occurs?
Surfaces exposed to radiant heat
In the heat recovery section
At the blower fan
In the flue gas stack
What causes the erosion and corrosion of a metal surface in the boiler?
(a)
The high alkali metal content in biomass can cause a problem. One way to reduce the problem is by co-firing it with coal. What is the specified problem?
(a)
