11.1 DEFINITION

Aboiler is a vessel in which water is continuously vaporized into steam by the application of heat. The steam that the boiler produces can be used for power generating, water heating and manufacturing processes.

11.2 INTRODUCTION

Efficient and trouble-free operation of boilers is very important when industrial plants generate their own power or when steam is required for manufacturing operations. It is, therefore, very important for engineers to understand the factors which lead to the fouling and corrosion of various components of boilers, and also to understand the methods which lead to the smooth and risk-free operation of boilers.

11.3 REQUIREMENTS OF AN EFFICIENT BOILER

To meet the minimum requirement of an efficient boiler, the boiler should:

1. generate maximum amount of steam at required pressure and temperature with minimum fuel consumption

2. be light in weight and occupy minimum space

3. confirm to safety regulations

4. involve low initial installation capital and maintenance cost

5. exhibit easy accessibility for repair and replacements.

11.4 CLASSIFICATION OF BOILERS

Boilers are classified according to use, pressure, materials of construction, tube content, firing mode and heat source.