Читать книгу Encyclopedia of Renewable Energy - James Speight G., James G. Speight - Страница 90

Solid fuels are those fuels that are solid under ambient conditions and remain solid under mild heating. Thus, examples of solid fuels from biofuel feedstocks include wood and wood-derived charcoal and dried dung, particularly cow dung.

Compared to gaseous fuels and liquid fuels, solid fuels are often cheaper, easier to extract, more stable to transport, and in many places are more readily available. Coal, in particular, is utilized in the generation of electricity because it is less expensive and more powerful than its gaseous or liquid fuel counterparts. However, solid fuels are also heavier to transport, require more destructive methods to extract/burn, and often have higher carbon, nitrate, and sulphate emissions. With the exception of sustainable wood/biomass, solid fuel (such as peat or coal) is typically considered to be non-renewable because it requires thousands of years to form.