2017.10.13 19:27
Boiler Stoker Training in Questions and Answers, Excerpt
Here is an excerpt from the manual "Boiler Stoker Training in Questions and Answers":
Chapter: Heat Losses in the Boiler
When is the furnace operated economically?
When the boiler's heat losses are minimized.
Which heat losses of the boiler can the stoker influence?
The loss from incomplete combustion of fuel, the loss from partial combustion, and the chimney loss.
What do we mean by the loss from incomplete combustion?
The loss from incomplete combustion is unburned coal delivered to the grate, such as coal that falls into the ash pit, small pieces of coal embedded in slag, partially burned pieces of coal on the chain grate, and coal carried away as fine particles into the flue channels or outside the boiler room (through the chimney).
How can the loss from incomplete combustion be reduced?
By using the appropriate grade of fuel for the grate, wetting the fine coal, re-burning the coal that falls under the grate, and managing the chain grate in such a way that the coal burns completely before reaching the slag removers.
What do we mean by the loss from partial combustion?
The loss from partial combustion is mainly caused by coal not completely burning to carbon dioxide, but partially to carbon monoxide (the losses this causes and how to avoid them were discussed in previous chapters).
What do we mean by the chimney loss?
The chimney loss is the heat carried away in the flue gases escaping to the chimney. It is higher, the higher the temperature of the flue gases escaping to the chimney and the greater the amount of these gases.
How can the chimney loss be reduced?
This can be achieved by maintaining the lowest possible excess air coefficient, so that carbon monoxide does not appear in the flue gases, and by ensuring the proper cleanliness of the heating surface.
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