KSD nozzle lances
KSD0 nozzle
KSD0 nozzle, functional drawing
KSD1 nozzle
KSD2 nozzle
KSD3 nozzle
KSD1/KSD2/KSD3 nozzle, functional drawing

KSD nozzle lances

Emergency operation characteristics due to external mixing

KSD nozzles are twin-fluid nozzles that inject with a particularly uniform full-cone with a spray angle of up to 30°. The nozzles operate according the principle of external mixing, i.e. gas and liquid are mixed outside the nozzle body.

Technical data (pdf, 575 KB)
Lechler India Pvt. Ltd.
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Spray angle
Spray angle20° – 30°
Turn down ratio
Turn down ratioup to 5:1
Typical pressure range
Typical pressure rangeLiquid: 1.0 – 10.0 bar, g
Atomizing air: 1.0 – 15.0 bar, g
Flow rate range
Flow rate rangeLiquid: 0.06 – 141.0 l/min

The liquid is fed into the inner space of the KSD nozzle, swirls and emerges as a hollow cone. The atomizing medium is fed to the KSD nozzle and emerges through a defined ring gap. Immediately after leaving the KSD nozzle, the liquid is thoroughly mixed with the atomizing medium. The hollow cone is transformed into a full cone with a fine droplet spectrum.

The fineness of the droplet spectrum significantly depends on the atomizing medium/liquid ratio. The fineness of the droplet spectrum increases as the atomizing medium/liquid ratio increases.

Due to the principle of external mixing used in the KSD nozzle, liquid and atomizing medium do not influence each other when the upstream pressure changes. Since the media are mixed outside the KSD nozzle, this nozzle is also suitable for using steam as atomizing medium.

KSD nozzles have optimum emergency running properties in the event of failure of the atomizing medium, since the liquid is still atomized as a hollow cone in such cases. However, the droplet spectrum in this case is not as fine as when an atomizing medium is used.


  • Gas cooling in gas cooling towers
  • Gas cooling in gas-bearing pipes (ducts)
  • Injection of ammonia water and urea solution for DeNOx processes (SNCR/SCR)

Application areas

Evaporative and chlorine-bypass cooler

Gas cooling in evaporative cooler

Downcomer Duct

Gas cooling in downcomer duct

SNCR process

Denitrification DeNOx SNCR

SCR process

Denitrification DeNOx SCR

Functionality of KSD nozzle lances

For operating the KSD nozzles with steam, a special lance design was developed. To prevent cooling or heating of the media, the cold liquid tube is isolated from the steam tube.

Our nozzle lances are project-related customized designs and are made individually to suit the local and process engineering conditions. They enable optimum positioning and alignment of the spray in the flue gas duct.

The nozzle lances are made of high-quality stainless steel and can be manufactured from chemical-resistant and high-temperature-resistant materials according to the respective process-specific requirements.

Optional equipment for the nozzle lances include the following:

  • Protection tube to increase the service life in case of higher temperatures, high dust loads and aggressive gases
  • Expansion joint or stuffing box for expansion compensation at high temperatures
  • Wedge flange, DIN flange or special flange
  • Shifting device to change the insertion length
  • Pre-assembled accessory kits for media connections
  • Further special customizations such as wear protection, guide rail, insulation, water cooling or coating

Assembly KSD nozzle

Disassembly KSD nozzle