It is now being considered for use in several bioenergy conversion processes, including cellulosic ethanol production, biogas, and direct combustion for thermal energy applications.

There are a number of other new and emerging technologies that are able to produce energy from waste and other fuels without direct combustion.

Many of these technologies have the potential to produce more electric power from the same amount of fuel than would be possible by direct combustion.

Unfortunately the direct combustion of rice hulls produces large quantities of smoke.

The resulting gas mixture, syngas, is more efficient than direct combustion of the original biofuel; more of the energy contained in the fuel is extracted.

Von Braun's engine used direct combustion and created fire, the Walter produced hot vapours from a chemical reaction, but both created thrust and provided high speed.

In addition to emissions from direct combustion, fires can lead to the release of large amounts of methane from soil, especially in high latitude regions.

Dried biomass has a direct combustion high heating value of 8000 BTUs/lb.

This is very similar to the reaction of those compounds by direct combustion in the air.

In the first sense, biomass is plant matter used either to generate electricity (via steam turbines or gasifiers), or to produce heat (via direct combustion).