Waste Heat Recovery Boilers ( WHRB ) - ASKPOWERPLANT

Waste Heat Recovery Boilers ( WHRB )

Waste Heat Recovery Boilers
BOILER OPERATION

Waste Heat Recovery Boilers ( WHRB )

Waste heat boilers are generally water tube boilers in which the hot exhaust gases from gas turbines, incinerators, etc., pass over a number of parallel tubes containing water. The water is vaporized in the tubes and collected in a steam drum from which it is drawn off for use as heating or processing steam

In waste heat recovery boiler the exhaust gases are usually in the medium temperature range and in order to conserve space, a more compact boiler can be produced if the water tubes are finned in order to increase the effective heat transfer area on the gas side. Mud drum consists a set of tubes over which the hot gases make a double pass, and a steam drum which collects the steam generated above the water surface. The pressure at which the steam is generated and the rate of steam production depends on the temperature of  waste heat. The pressure of a pure vapor in the presence of its liquid is a

function of the temperature of the liquid from which it is evaporated. The steam tables tabulate this relationship between saturation pressure and temperature. Whenever the waste heat in the exhaust gases is not sufficient for generating the required amount of process steam, auxiliary burners which burn fuel in the waste heat boiler or an after-burner in the exhaust gases flue are added. Waste heat boilers are built in capacities from 25 m3almost 30,000 m3 / min. of exhaust gas. Most of waste heat boilers are used to recover energy from the exhausts of gas turbines, reciprocating engines, incinerators, and furnaces.

 

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