Ash deposition is a major considerations when modifying any combustion system. The links at left summarize and illustrate the issues associated with ash deposition, some experimental highlights from laboratory investigations, and conclusions regarding ash deposition trends. The general guideline for ash deposition is:
Fuels with low ash contents and, especially, minimal alkali or chlorine in the ash should present minimal ash deposition problems and represent the fuels of choice. Fuels with high alkali and chlorine contents can substantially increase deposition problems.