Guide For Chemical Cleaning Of Boilers

Chemical cleaning can play an important role in boiler maintenance

. Boiler heat rate, reduction of tube failures and stability of boiler chemistry can be improved by chemical cleaning. Deposits from inside of boiler tubes can be removed. This would help in maintain boiler and upgrade the stability of the equipment chemistry.

One should know the time and the duration to clean it:

1. It is important, to use chemicals only when required. In fact, the need for chemical cleaning at many utilities has been reduced due to feedwater and usage of boilers this has resulted in their extension and has increased the time span.

2. When does it require cleaning? the best way to determine the need to clean is to take Two or three tube samples should be taken from high heat flux areas of the boiler and analyzed for deposit loading on the inside of the water wall tube. This can be practiced only under one assumption that there have been no major since the last chemical cleaning. Boiler tube removal becomes crucial when contamination incidents increase in period of time

3. Periodic Cleanings. Most important factors that consider cleaning are frequency of start-up and shutdown and water chemistry. Even the duration matters. For an instance Cleaning based on time either operating hours or number of years since the last chemical cleaning is probably the worst way to determine need.

4. A Major occurrence of Contamination: when there is a major contamination of boiler water a chemical cleaning should be performed at the next opportunity which is often overlooked. The best time is when the unit is restarted. A condenser tube leak is a common cause of contamination.

5. Evaluation of risk: Few things to be considered while deciding on chemical cleaning.

It can be Expensive

Can lead to dangers to employees and personnel of the company.

An environmental hazard

6. When can chemical cleaning be postponed: The main reason for introducing chemical cleaning is because of corrosion particles accumulating in the boiler walls? Instances of chemical cleaning increases with increase in number of corrosion products generating in feed water and boiled tubes. Time between cleaning can be reduced by depletion of such instances which would improve overall boiler chemistry

During start-up a large percentage of the corrosion products on boiler tube walls come in from the feedwater system.the difference between the need to clean with chemicals every three years and every 12 years can be meaned by improving lay-up and start-up practices. Better lay-up and start-up practices can be met by finding a knowledgeable consultant or chemical vendor that will help you develop and get out of the chemical cleaning cycle

Since the objective of a chemical cleaning is to safely remove all the deposits from the inside of the boiler tubes, chemical cleaning has been considered a necessary part of boiler maintenance for many years.

by: Michelvar Smith

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