REP Bioenergy and Waste-to-Energy 2

Question 1

Which gasification agent produces the highest heating value syngas but is too costly for most commercial waste-to-energy applications?

Accepted Answer

Pure oxygen

Answer

Steam

Answer

Air

Answer

Carbon dioxide

Question 2

The Fischer-Tropsch process converts syngas into liquid fuels primarily through which reaction type?

Accepted Answer

Catalytic hydrogenation of CO and H2

Answer

Fermentation

Answer

Pyrolytic cracking

Answer

Anaerobic oxidation

Question 3

In a biomass integrated gasification combined cycle (BIGCC) plant, what is the primary efficiency advantage over conventional steam-only biomass power?

Accepted Answer

Use of gas turbine topping cycle before steam recovery

Answer

Lower feedstock moisture tolerance

Answer

Elimination of all emissions

Answer

Direct methane injection to grid

Question 4

Which municipal solid waste fraction typically has the highest energy content on a dry weight basis?

Accepted Answer

Plastics

Answer

Food waste

Answer

Glass and ceramics

Answer

Ferrous metals

Question 5

What does the term 'refuse-derived fuel (RDF)' specifically refer to?

Accepted Answer

Processed and shredded MSW with non-combustibles removed for fuel use

Answer

Raw unprocessed municipal solid waste burned directly

Answer

Landfill gas captured after waste decomposition

Answer

Sewage sludge pellets used in boilers

Question 6

Hydrothermal liquefaction (HTL) is particularly advantageous for which feedstock characteristic compared to conventional pyrolysis?

Accepted Answer

High-moisture content algae and wet biomass

Answer

Very dry lignocellulosic wood chips

Answer

Pre-dried agricultural residues

Answer

Low-ash coal blends

Question 7

Which metric is used to quantify how much electrical energy a waste-to-energy plant generates per tonne of waste processed?

Accepted Answer

Specific electricity output (kWh/tonne)

Answer

Capacity factor

Answer

Net heating value ratio

Answer

Combustion efficiency index