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The reintroduction of part of the combustion gas at a point upstream of the removal point, in the lower furnace for the purpose of controlling steam temperature.

Related Terms

ADJUSTABLE DIFFERENTIAL

A means of changing the difference between the control cut-in and cut-out points.

BUBBLE POINT

The differential gas pressure at which the first steady stream of gas bubbles is emitted from a wetted filter element under specified test conditions.

ACTION

Refers to the action of a controller. It defines what is done to regulate the final control element to effect control.

SHED MODE

A method of demand control that reduces kW demand through shedding and restoring loads.

ARC

A flash, caused by an electric current ionizing a gas or vapor.

RETURN-STEAM CONDENSATE

That steam produced by a boiler which returns to the boiler after it has condensed.

ADIABATIC COMPRESSION

Compressing a gas without removing or adding heat.

FABRICATION INTEGRITY POINT

The differential gas pressure at which the first stream of gas bubbles are emitted from a wetted filter element under standard test conditions.

FLUID

A substance readily assuming the shape of the container in which it is placed; e.g. oil, gas, water or mixtures of these. A general classification including liquids and gases.

CATALYST

A substance which speeds a chemical action without undergoing a chemical change itself during the process. Now used in catalytic converters to control amount of unburned hydrocarbons and CO in automobile exhaust.
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