Chemical Engineering Basics
The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.

Pulverised fuel
Travelling grate stoker firing
Circulating fluidised bed
Fluidised bed

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Chemical Engineering Basics
What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

Scale formation rate on economiser tubes increases
Economiser tube life increases due to handling of low temperature water
Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water

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