Energy Saving in Boilers

Explore how a boiler produces steam for processing and external applications, examine boiler types and specifications, and discuss safety standards and energy-saving considerations.

Identify boiler classification and the four main systems—water, fuel, gas, and steam—and compare fire-tube, water-tube, pulverized coal, and solid fuel fired designs, with efficiency and blowdown notes.

Explore methods to evaluate boiler performance, comparing direct and indirect approaches, calculating steam output, fuel input, and boiler efficiency from enthalpy and calorific values, while identifying key loss factors.

This lecture outlines indirect boiler efficiency method, showing how to quantify losses from flue gas heat, moisture, and incomplete combustion using flue gas analysis and fuel analysis to estimate efficiency.

Analyze boiler losses using the indirect method to quantify heat losses from flue gas, moisture, and unburned fly ash. Identify efficiency-improving targets by evaluating radiation, convection, and excess air.

Know how to treat boiler water to prevent scale and corrosion by internal and external treatment, deaeration, mineralization, and softening, with monitoring of dissolved gases and scale buildup.

Blowdown removes impurities from boiler water to control hardness and prevent scaling. Choose intermittent or continuous blowdown, with heat recovery possible via a flash tank.

Boost boiler availability through water treatment, removal of external carbon deposits, and maintenance of startup and shutdown procedures, including dry and wet preservation, to prevent fouling and corrosion.

Explore energy conservation in boilers through closed-cycle fluid heaters, waste heat recovery, and six efficiency measures - combustion, process efficiency, heat transport, losses, water quality, and boiler replacement.