Boiler Feed Water - Impurities, Treatment, Blowdown And Cycles Of Concentration

Quite sometime back during my tenure in Saudi Arabia, I was involved in a project related to a large-capacity, gas-fired, D-type water tube boiler. The capacity of the boiler was 530,000 lb/h (240 TPH).

During that time I had been studying about the requirement and design calculations for boiler feed water (BFW) for the boiler since it was part of the overall design engineering. For my understanding and clarity I had prepared an excel workbook related to BFW wherein the various natural sources for make-up water, the impurities that need to be addressed for enabling it to be fed to the boiler, the treatments that were required to remove or reduce the impurities, the concept of water blowdown from the boiler and the definition and calculations related to cycles of concentration (CC) were addressed.

An organization called "American Boiler Manufacturer's Association" (ABMA) as well as ASME provides guidelines for the quality of BFW as a function of the steam drum pressure and readers can refer the links provided below for that as well as some some guidelines on water treatment. Refer he link below for ASME guidelines for water-tube boilers:

http://www.cip.ukcentre.com/steam.htm

ABMA provides the following guidelines for BFW quality:

http://www.banksengi...om/blrwater.htm

http://vganapathy.tr...om/dasteam.html

Today, I did some polishing work on the excel workbook and it is now ready to be shared with the readers and members of "Cheresources". Hope you will enjoy this workbook and I am looking forward to your comments on the same.

Reagrds,
Ankur.

The MS Excel spreadsheet can be downloaded here:

Boiler Feed Water Design Notes