Practical Process Engineering

Annular Venturi Orifice Desuperheater

Annular Venturi Orifice Desuperheater

#ATTEMPERATOR *APPLICATION Attemperator Desuperheaters reduce steam temperature by bringing superheated steam into direct contact with water. The steam is cooled through the evaporation of the water. Attemperators can be mounted either horizontally or vertically and are normally used for relatively steady load conditions where pressure losses must be minimized. These desuperheaters are a modification of the venturi-type unit, without the venturi tail, and offer increased turndown when mounted vertically up. *OPERATION Water enters the attemperator and is preheated in the circulatory chamber around the water diffuser tube. It is then introduced in many small jets to assist final atomization by the steam flow through the center of the throat. After leaving the throat, the mixture of steam and water enters the main steam flow in a fog-like condition where final heat transfer is achieved without contacting the sidewalls - providing maximum desuperheating effectiveness with minimum of pipe wear. Water pressure into the attemperator should equal steam line pressure. *PERFORMANCE While it is less costly and has negligible pressure losses, it normally does not have the rangeability of the venturi- type unit. Actual turndown ratio is dependent upon a wide variety of factors, such as installation, amount of residual superheat downstream, piping, etc. Normal flow variation is 75% to 15% of flow.

Attemperator

Different Kinds of desuperheaters👇🏼👇🏼👇🏼👇🏼

INTERNAL COIL

HALF PIPE COIL JACKET

DIMPLE JACKET

CONVENTIONAL JACKET

Different kinds of JACKETS👇🏼👇🏼👇🏼👇🏼

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