Desuperheater

The primary function of a desuperheater is to lower the temperature (or attemperate) of a superheated steam line using a cooling water source (typically a boiler feedwater (BFW)). The superheated steam or gas is directly contacted with the cooling water or fluid to immediately begin the process of evaporation and absorption into the steam line. Typically, enough water is injected into the line to bring the steam temperature down to around Saturation (+/- 10°F), but the desuperheaters can be used to only slightly attemperate the steam to a specified final temperature if desired. Komax desuperheaters can also operate with a turndown range of up to 20:1 with proper pressure controlling.
The Komax Desuperheater utilizes a unique approach to desuperheating compared to conventional desuperheaters, using both a low pressure spray nozzle directed upstream of the steam flow and using a patented Equalizer® Mixing Module is incorporated into all of our desuperheater designs. This mixing module is specifically designed for gas/liquid mixing and can shear the water droplets (or cooling fluid droplets) to very fine sizes, which makes for quick and efficient absorption of water into the superheated steam line.

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Industries

  • Power Generation
  • Food & Beverage
  • Chemical
  • Pulp & Paper
  • Oil/Gas
  • Petrochemical
  • Plastics Industry
  • Oil Sands / Mining Material
  • LNG

TYPICAL APPLICATIONS

  • Saturated steam
  • Superheated steam
  • Water
  • Propane vapor
  • Propane liquid
  • Regenerant
  • Boiler feed water

End Connections & Available Custom Options

Flanged Ends: Flanged end connections allow for easy mounting of the desuperheater into the process pipeline. As a general standard, metal desuperheaters have raised face flanges per ASME B16.5 or ASME B16.47 (for sizes larger than 24”) standards. Komax can also fabricate mixers to contain DIN (metric) flanges as well.

Threaded Ends: Komax Systems offers male and female NPT end connections on desuperheaters as required.

Weld Prep Ends: For custom configuration Komax Systems offers weld prep end connections on Desuperheaters.

*All desuperheaters are made per customer specification; end connection type can be made per customer request.

Materials & Sizing

Diameter: 2” – 48” (for sizes above 16”, contact Komax Systems for more information)

Standard Metals: Stainless Steel, Carbon Steel, Teflon Lined, Carbon Steel, Chrome Moly (P11/P22/P91)

Exotic Metals: Hastelloy, Inconel, Monel, Alloy 20, Chromalloy, SA335-P11, A335-P22

Pipe Schedule: Schedule 10-40

LNG Desuperheater

The Komax Desuperheater is also being used in the LNG industries to cool Boil Off Gas (BOG) before ship loading/unloading. Instead of water, cold LNG is used as the cooling fluid to desuperheat or attemperate the BOG to the correct temperature for further processing. These desuperheaters are typically made out of Stainless Steel and are rated for cryogenic services.

The Komax Desuperheater Equalizer™ Mixing Module and Mixing Philosophy

The Komax Desuperheater, unlike conventional desuperheaters, uses a multiple stage mixing system using the patented Komax Equalizer® Mixing Module. The first stage of mixing occurs at the water injection point; the water is sprayed upstream of the flow using low pressure full cone spray nozzles to adequately distribute the water across the cross section. Small droplets are sheared to even smaller sizes using the velocity from the steam blowing the sprayed water downstream toward the Equalizer®. The second stage of mixing occurs at the Equalizer®. The equalizer consists of 6 mixing chambers with a helical mixing element in each chamber, which leads to 12 divisions and instances of increased turbulence between the steam and water, further shearing the water droplets to be effectively absorbed into the steam line. The third and last stage of mixing occurs at the Equalizer® outlet, where the 12 streams recombine to blend together and complete the mixing and water absorption to be carried downstream to the next part of your process.
Because of these mixing processes, we are able to reduce the downstream requirements from approximately 30 pipe diameters to 10 pipe diameters before the temperature probe. The quick absorption of the water into the steam also greatly reduces the risk of stress in the piping due to thermal cycling, as water will not pool on the bottom of the pipeline. This removes the need for expensive thermal liners in the Komax Desuperheater, however, liners can be included in the design if desired.

Desuperheater Sizing Table:

Line Size Port Size* Equalizer Size Overall Length Shipping Wt. in LBS
L1** L2** L3** 150# 300# 600#
2″ 1/2″ 2″ 12″ 4″ 4″ 15 17 21
3″ 1″ 3″ 12″ 5″ 5″ 19 20 26
4″ 1″ 4″ 14″ 6″ 7″ 35 33 49
6″ 1″ 6″ 18″ 8″ 8″ 53 60 94
8″ 1″ 8″ 20″ 8″ 9″ 96 109 187
10″ 1″ 10″ 24″ 10″ 10″ 174 187 293
12″ 1 12″ 29″ 10″ 13″ 298 352 482
14″ 1″ 14″ 33″ 12″ 14″ 400 440 610
16″ 1″ 16″ 36″ 15″ 16″ 650 884 1124
*Port size may change based on customer requirements.
**Lengths may change based on connection type or customer requirement

Downloadable Information:

Desuperheater Brochure