30 September 2023

Basic Boiler Principles | Boiler Principles

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Basic Boiler Principles

Basic Boiler Principles

Water and solids enter the boiler
Water leaves the boiler as steam
Solids concentrate in the boiler
Therefore the boiler water will contain more solids than the feedwater
This Concentrating effect is called The Cycles of Concentration or The Cycles

A boiler can only tolerate a specific number of cycles of concentration, This will vary depending on:-
1.) Type and pressure of the boiler
2.) Type of external treatment
3.) Percentage condensate return

The chemical factors which limit the boiler water cycles of concentration are

1.) Suspended solids (Total Hardness)

2.) Dissolved solids

3.) Total alkalinity (M Alkalinity)

4.) Silica

How do we determine the chemical control limits that we apply to an operating boiler ?
• British Standard BS2486:1997
• ASME Guidelines* 1994
Consensus on operating practices for the control of feedwater and boiler water chemistry in modern industrial boilers.

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