The document discusses various topics related to steam boilers and power plants, including: 1. An ORSAT apparatus determines the levels of CO2, CO, O2, and N2 in flue gas from a steam boiler. 2. Pumped storage hydro-electric plants pump water to an elevated storage during off-peak periods to generate power from the stored water during peak periods. 3. Tangential burners are used in Philippine coal thermal plants and the Hardgrove apparatus determines coal grindability.