A steam boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure (7–2,000 kPa or 1–290 psi) but, at pressures above this, it is more usual to speak of a steam generator.
Combined-cycle power plants ( Fig. 2.3) are compound gas turbine–steam turbine systems wherein the extreme hot exhaust from a gas turbine is employed to run a boiler, and the steam thus produced is fed into a steam turbine to generate power. These plants can deliver high power output at efficiencies as high as 50%–60% with low emissions and
The waste heat boiler market by end-use industry is bifurcated by applications of waste heat boilers in power generation, oil & gas, chemical & fertilizer, steel, petroleum refinery, and cement industry, among others. Waste heat boilers are popular in the chemical and fertilizer industries owing to their addition in saving energy costs.