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Boiler- & Burner-Related Glossary Terms

Trying to learn your way around your boiler? These terms are a great place to start.

# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
There are currently 41 names in this directory beginning with the letter C.
Small water particles and impurities carried out of the boiler into the steam lines.
caustic embrittlement
A type of corrosion in which boiler metal becomes brittle because alkaline materials accumulate in cracks and crevices.
centrifugal blower
A blower that has a rotating impeller in a housing that throws the air to its outer edge, increasing the air's velocity and pressure.
centrifugal feed water pump
A pump that uses the centrifugal force of a rotating element to pressurize water so it can be added to a boiler.
chain grate stoker
A stoker that feeds the coal into the boiler on a traveling grate. Also known as a traveling grate coal stoker.
chemical precipitation
A process in which a chemical is added to raw makeup water to react with dissolved minerals, creating heavier particles that settle out of the solution.
closed feedwater heater
A feedwater heater used to capture heat from continuous blowdown water from a boiler or flash steam from a process.
A process in which the chemicals added to raw water cause suspended solids to adhere to each other, making them larger and heavier and causing them to settle out of the solution.
A solid black fossil fuel formed when organic material is hardened in the earth over millions of years.
coal grade
The size, heating value, and ash content of the coal.
coal rank
The hardness of the coal.
cofiring furnace
A furnace that mixes burnable material, such as biomass, with a fossil fuel for combustion.
The process of generating electricity and then using the waste heat from the generating process for heating buildings, providing process heat, or for further electrical generation.
combustible material
Any material that burns when it is exposed to oxygen and heat.
The rapid reaction of oxygen with a fuel that results in the release of heat.
combustion chamber
See furnace.
combustion control system
An automatic boiler control system that regulates fuel supply, air supply, air-fuel ratio, and draft in a boiler in order to deliver the required amount of steam to a load.
combustion efficiency
The ability of the burners to burn fuel efficiently.
complete combustion
Combustion that occurs when all the fuel is burned using a minimum amount of excess air.
compressive stress
Stress that occurs when two forces of equal intensity act from opposite directions and push toward the center of an object.
condensate polisher
An ion-exchange conditioner that removes impurities from condensate.
condensate return tank
An accessory that collects condensate returned from heating units.
condensing steam turbine
A steam turbine that allows condensate to be reclaimed for use in the system.
The ability of a material to allow the flow of electricity.
conductivity meter
An instrument that measures the electrical conductivity of a water sample to determine total dissolved solids present.
confined space
A space large enough and so configured that an employee can physically enter and perform as­ signed work, has limited or restricted means for entry and exit, and is not designed for continuous employee occupancy.
continuous blowdown
The process of continuously draining a small, controlled amount of water from a boiler to control the quantity of impurities in the remaining water.
continuous emissions monitoring system (CEMS)
An emissions system used for continuous measurement of pollutants emitted into the atmosphere in exhaust gasses from combustion or industrial processes.
control device
See final element.
control element
A device that takes an input signal, compares the signal to a setpoint, performs a computation, and sends an output signal to a final element. Also known as a controller.
control loop
A system that consists of a primary element and transmitter, a control element, and a final element.
control system
A system of measuring instruments and controllers that work together to control a process.
control valve
A final element that is used to modulate fluid flow in response to signals from a control element.
See control element.
convection air heater
An air heater that uses convection to transfer heat from the gasses of combustion to the combustion air.
convection superheater
A superheater that receives heat from convection currents in the gasses of combustion.
Coriolis flow meter
A meter that measures the mass flow rate of a fluid.
The deterioration of the boiler metal caused by a chemical reaction with oxygen and carbon dioxide in the water.
critical pressure
The pressure at which the density of water and steam are the same.
cross-limited control
A control strategy in which increases in airflow lead increases in fuel flow, and decreases in air flow lag decreases in fuel flow.
cyclone separator
A cylindrical device that separates water droplets from steam using centrifugal force.
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