Laval-Flachstrahldüse (für DeNOx-Anwendungen)
Sprühbild Laval-Flachstrahldüse (für DeNOx-Anwendungen)

Laval Flat Fan Nozzle Lances

Special twin-fluid nozzles for DeNOx applications.

The Lechler Laval flat fan nozzle is a special nozzle designed to match the specific requirements of the SCR and SNCR processes. The air/liquid mixture exits via three outlet holes creating a wide and flat spray pattern with an even better area coverage. The droplet spectrum and the impulse of the droplets can be adjusted by changing the air/liquid ratio.

Technical data (pdf, 1 MB)
Lechler Process Technology
Fon +49 7123 962-0
Fax +49 7123 962-301


Wide and flat spray
Wide and flat spraySpray angle 60°
Turn-down ratio
Turn-down ratioof over 10:1
Typical pressure range
Typical pressure rangeLiquid 1-5 bar, g; Atomizing air 1-5 bar, g
Spray alignment possible
Spray alignment possible
Adjustment of the droplet spectrum
Adjustment of the droplet spectrumby changing the air/fluid ratio

For optimum process results in denitrification, the droplet size and velocity are of decisive importance. We help you to select the appropriate nozzle and a suitable control concept in order to achieve the best possible distribution of the reducing agent and the optimum penetration depth of the droplets into the flue gas stream.


  • „Gas cooling in gasbearing pipes (ducts) and medium-sized and small gas cooling towers
  • Injection of solids-laden water
  • Introduction of lime water in the desulfurisation process
  • Injection of aqueous ammonia or urea solution for the DeNOx process (SNCR/SCR)
  • Chemical process engineering (spray dryers etc.)

Application areas

SNCR process

Denitrification DeNOx SNCR

SCR process

Denitrification DeNOx SCR

Functionality of Laval Flat Fan Nozzle Lances

Our nozzle lances are project-related  designs and are manufactured taking into account the local and process-engineering conditions as well as the regulations for DeNOx applications. Furthermore, customer-specific versions with options such as protection tube and barrier air connection as well as shifting devices for adjusting the insertion length can be realized.