Abstract
Results are presented of a theoretical study to assess the viability of using water-in-oil emulsions for power-station boilers to reduce pollutant emissions, deposit buildup on heat-transfer surfaces and excess-air requirements while improving boiler efficiency. The variables studied include the water concentration (0–10%) and percentage of maximum output (40–100%). SO x and NO x emissions are reduced by 20 and 5.5 kg/h, respectively. The dirt factor of the water-wall tubes drops by 27% without a significant change in the tube temperature. The excess-air coefficient is reduced by 13% and the boiler efficiency is increased by 0.75%. The maximum gas-temperature rise and decrease along the boiler pass are ∼ +50 and ∼ −5K, respectively, as the water concentration is increased from 0 to 10%.
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