Desuperheaters : Shail Vac Engineers, Next Generation Vacuum Systems :: Surat :: Gujarat

Desuperheating, sometimes called attemperation or steam conditioning, is the reduction of gas temperature. Its most common application is the reduction of temperature in a steam line through the direct contact and evaporation of water. NCI desuperheaters use uniquely effective methods to inject the water and maximize the surface contact area between the steam and water to increase the rate of water evaporation. Most of our desuperheaters inject water through several small holes into the path of the high velocity steam where the water is atomized Into small water droplets and quickly evaporated into the steam. Thermal pipe liners are not normally required.

Desuperheaters are used in power boiler heat recovery systems, for super heater Inter stage temperature control, paper dryer drum temperature control, steam kettle or cooker temperature control, and aircraft catapult machines.

Most desuperheaters can be installed horizontally or vertically. Desuperheaters are often supplied with steam and water control valves and controllers to provide an automatically controlled system. The controllers can be either pneumatic or electronic.

The construction material is normally carbon steel for the outer pipe or wall with 316 stainless steel for the wear parts. Other weldable machinable metals may also be used. In some applications, fiberglass, Teflon, or other plastic may be a suitable fabrication material.

Desuperheaters reduce the temperature of superheated steam to produce lower temperatures (normally 10° F above saturation, although Type 6910 is capable of producing saturated steam). The majority of our units (except Types 6905 and 6910) require water at line pressure. Water is syphoned into the water box/combining tube assembly, where it is heated, and then mixed with a percentage of steam through the throat region and introduced into the steam line as a finely atomized mist. Water entrainment, shearing and mixture, all within S & K internal construction, produces extremely small water particles and alleviates requirements of thermal liners and impingement shields. For Type 6905, where water is injected at high pressure and internal construction consists of a water nozzle, we supply or recommend thermal liners.

Advantages
Efficient, evaporated cooling water adds to steam load Various types, configurations and sizes No moving parts No special supports No thermal liner required (except for emergency dump application)