... infiltration. Reverse air should be heated to prevent condensation.b. Boilers. Electric utilities and industrial boilersprimarily use electrostatic precipitators for air pollution control, but some ... the formation of SO .x(1) 50 3 formation increases as flame temperatureincreases. Above 3, 150 degrees Fahrenheit, 50 3 formation no longer increases.(2) SO formation increases as the excess air ... of each on particulate and air heaters.emissions, boiler capacity and gas tem- h. Limestone injection. One of the earliest tech-peratures, boiler fouling and slagging, and niques used to reduce...