Emission regulations are becoming increasingly strict and for this reason, industrial manufacturers are required to find more effective ways at reducing emissions. NOx is detrimental to both human health and the environment because once it is emitted into the air it can become a component of smog and acid rain. These can cause pulmonary and respiratory issues, as well as destroying vegetation and plant growth.

For years, Lechler has specialized in nozzle lances and systems for DeNOx applications to help reduce emissions. In flue gas denitrification, reducing agents such as ammonia water or urea solution are sprayed into the gas stream. The most effective nozzles for selective non-catalytic reductions (SNCR) applications are the Laval twin fluid nozzles.

These nozzles atomize liquids as a fine full cone and work on the super-sonic principle.  By changing the air/liquid ratio, the droplet size and the droplet spectrum can be adapted within a wide range for special applications.


For the non-catalytic reaction, a reagent (mostly aqueous ammonia) is specifically injected in the area of the optimum temperature window of approx. 1,742 - 1,922°F. Exceeding or falling below the temperature window will lead to additional NOx formation or an increase in the NH3 slip. The efficiency is reduced in both cases. In addition to the optimum temperature, parameters such as droplet size and velocity are also of crucial importance. Only with the appropriate nozzle and the right control concept can the droplets penetrate deep enough into the flue gas flow to ensure optimum distribution of the reducing agent in the flue gas flow.        

SNCR applications in the cement industry at a glance

SNCR process for the reduction of nitrogen oxides and compliance with the legal limit values through powerful denitrification systems in various configurations.Controllable and multi-stage injection to ensure precise SNCR denitrification for plants with optimal temperature range in the rotating kiln.

Nozzle Lances & Systems for SNCR

Our nozzle lances are designed to ensure optimal spray placement and alignment in flue gas ducts.   The nozzles themselves have a low-maintenance design and can be quickly cleaned or exchanged with minimal effort.  

Lechler offers pump and control skid solutions tailored to your application and plant-specific conditions. We use only high-quality components from renowned manufacturers for our valve skid units. If you choose a system with a control, you will get a complete solution for your gas-conditioning requirement from a single source.


Want to learn more about Lechler nozzle lances and systems for SNCR processes?

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