Process for increasing the effectiveness of slag and/or corrosion control chemicals for combustion units

A process for reducing the buildup of at least one of slag and corrosion in a combustion unit, comprising:

• determining at least one of slagging and corrosion locations within a combustion unit where such will occur in the absence of treatment;
• determining the temperature and gas flow conditions within the combustion unit;
• locating introduction points on a combustion unit wall where introduction of chemicals could be accomplished;
• based on the temperature and gas flow conditions existing between introduction points and the at least one of slagging and corrosion locations, determining the droplet size, amount of treatment chemical, amount of water as a carrier, and droplet momentum necessary to direct the chemical in active form to the slagging and/or corrosion locations;
• and,
• based on the determinations of the previous step, introducing chemical to reduce at least one of and slagging and corrosion.