In a boiler,
the device in which the waste heat of flue gases is utilised for heating feed
water is called a/an:
बॉयलर में, वह उपकरण जिसमें फ़्लू गैसों की अपशिष्ट ऊष्मा का उपयोग फीड जल को गर्म करने के लिए किया जाता है, उसे क्या कहा जाता है:
super-heater
injector
air preheater
economiser
economiser
The common
application of economizers in steam power plants is to capture the waste heat
from boiler stack gases (flue gas) and transfer it to the boiler feed water.
Hence, the
correct option is (D).
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