Packaged Boiler
The packaged boiler is so
called because it comes as a complete package. Once delivered to site,
it requires only the steam, water pipe work, fuel supply and electrical
connections to be made for it to become operational. Package boilers are
generally of shell type with fire tube design so as to achieve high
heat transfer rates by both radiation and convection.
The features of package boilers are:
- Small combustion space and high heat release rate resulting in faster evaporation.
- Large number of small diameter tubes leading to good convective heat transfer.
- Forced or induced draft systems resulting in good combustion efficiency.
- Number of passes resulting in better overall heat transfer.
- Higher thermal efficiency levels compared with other boilers.
These boilers are
classified based on the number of passes - the number of times the hot
combustion gases pass through the boiler. The combustion chamber is
taken, as the first pass after which there may be one, two or three sets
of fire-tubes. The most common boiler of this class is a three-pass
unit with two sets of fire-tubes and with the exhaust gases exiting
through the rear of the boiler.
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