A switching relay in which a small heater warms a bimetal element which bends to provide the switching force.
Related Terms |
EXTRACTION TURBINE
In an extraction turbine, steam is withdrawn from one or more stages, at one or more pressures, for heating, plant process, or feedwater heater needs. They are often called 'bleeder turbines'.
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RADIANT SECTION
The part of a process heater into which the burners fire. Tubes mounted in this area of the furnace receive heat principally via direct radiation from both burner flames and furnace refractory. Physical volume arrangement of the radiant section has a great effect on burner choice and required flame patterns.
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REHEATER
A device using highly superheated steam or high-temperature flue gases as a medium serving to restore superheat to partly expanded steam; used often between high- and low-pressure turbines.
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DEAERATOR
A type of feedwater heater operating with water and steam in direct contact. It is designed to heat the water and drive off oxygen.
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UNIT HEATER
A heater with electric resistance, steam, or hot water heating elements to heat the air. Natural or forced draft units are designed for wall mounting.
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BLED STEAM AIR HEATER
In this type of heater a steam used to heat the air flow. The heater consists of set of heating banks. Each bank contains has multiple of U-tubes with extended surface fins for passing a steam.
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SCREEN TUBES
In a water tube marine boiler, tubes that protect the super heater tubes from the fire of combustion.
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BLAST HEATER
A heater that has a set of heat-transfer coils through which air is forced by a fan operating at a relatively high velocity.
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BURNING-QUALITY INDEX
Prediction of burning performance of furnace and heater oils; derived from ASTM (American Society for Testing and Materials) distillation, API (American Petroleum Institute) gravity, paraffinicity, and volatility.
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CASCADING DRAIN
A flow of water into the closed shell of a feedwater heater from a water source maintained at a higher pressure.
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