What are the functions of the economizer and drum recirculation line in a waste heat boiler? How do I set it up?
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I’d like to ask what it’s used for and how to use it specifically Thank you
So, by your words, there is a path from the drum that leads back to the economizer? If that is the case, there are likely two purposes: first, to raise the water temperature in the economizer and thereby increase the heat recovery rate from the flue gases. Secondly, to better prevent dew point corrosion. Following this approach, I think it should be put into use only when there is an excess of heat in the boiler system.
The answer above makes some sense, but it seems a bit forced! Generally, when starting up or shutting down a furnace, the steam system needs to be disconnected from the pipeline network and vented locally. Appropriate water supply is used for replenishment, gradually removing heat to achieve cooling. Of course, my answer was also just a hasty idea and is open to discussion.