An optimized droplet size is very important for the design of gas cooling systems such as those used in cement plants. The smaller the injected droplets, the shorter evaporation distances can be realized.
Especially in large evaporative coolers, where large quantities of water are required for operation, spillback nozzles are often used. In this case, twin-fluid nozzles would increase the operating costs noticeably due to the additional compressed air consumption.
In the past, however, twin-fluid nozzles were often the only possible choice when short evaporation distances or system upgrades after increasing capacity were required.
This is no longer the case with the new RS II-3 series spillback nozzles. With their considerably finer droplet spectrum, the new generation of spillback nozzles can be used as an alternative to twin-fluid nozzles.
Successful increase in efficiency through Lechler spillback nozzles
Lechler has carried out the replacement of nozzle lances in an existing system at a cement plant in Northern Europe (Norway). Up to now, cooling to 160 °C was achieved at best in the evaporative cooler of the Norwegian cement plant. In addition, the problems of incomplete evaporation and wet bottom occurred.
By replacing the existing 16 nozzle lances with nozzle lances with RS II-3 it is now possible to cool down to 130 °C, which means an enormous increase in efficiency. The finer droplets also allow complete evaporation, thus eliminating the problem of wet soil.
Mounting and dismounting of the spillback nozzle on the lance is quick and easy, so that no cost-intensive maintenance times are required in the future.