Scrubbers with Lechler nozzles and mist eliminators improve air quality

From January 1st 2020, the IMO (International Maritime Organization) regulation requires all ships on the high seas to use marine fuel with a maximum sulphur content of 0.5% (currently permitted: 3.5%). This is intended to further reduce air pollutant emissions.

For better air: Scrubber with Lechler nozzles and droplet separators

This measurment is necessary in order to achieve a highly improved level of environmental protection, as heavy fuel oil (HFO) is usually used on the high seas. With the use of heavy oil, approximately 50,000 ocean-going vessels of the international merchant fleet are responsible for 13% of global emissions of sulphur oxides (SOx) and 15% of nitrogen oxides (NOx). The so-called Global Sulphur Limit, also known as Sulphur Cap, must now be regulated worldwide from 2020.

Scrubbers with nozzles and droplet separators reduce emissions

The installation of an exhaust gas purification system (scrubber) during the construction of a new ship or as a retrofit is one way of reducing emissions. Scrubbers are equipped with droplet separators and nozzles. In essence, the exhaust gases go through a chemical process (gas scrubbing) in which a gas stream is brought into contact with a liquid stream and the pollutants are washed out as far as possible. For the products in the scrubber, this process means maximum material stress, since salty seawater is used as the medium. According to the manufacturer's specifications, sulphur oxides are separated almost 100%. The purified exhaust gases produced by the scrubber produce approximately the same exhaust gas values as low-sulphur marine diesel, which, has a considerably higher price.

In a relatively young market of exhaust gas purification by scrubbers in the marine environment, Lechler has the special position that droplet separators and the corresponding nozzles for gas scrubbing come from one nozzle manufacturer and from one source. Lechler is making a major contribution today and in the future to ensure that the IMO regulations can be complied with.

Application examples

Applications in commercial shipping

Applications in commercial shipping

Nozzles and droplet separators for wet scrubbers

Exhaust gases are desulphurized using full-cone nozzles and the media salt and fresh water. Suggested, nozzles for these applications include: 403, 405 and 421 series.

Highly efficient droplet separators reduce the emission values from the stack. Here, droplet separators for vertical inflow are used above all.

Applications for cruise ships

Applications for cruise ships

Nozzles for exhaust gas cleaning (scrubber) and for cleaning mist eliminators

Exhaust gases are desulphurised using full-cone nozzles and the media salt and fresh water. Suggested nozzles for these applications include: 403, 405 and 421 series.

During the absorption process, droplets can be carried along in the gas stream. These droplets are optimally removed from the gas stream by Lechler's vertically approached droplet separators.
For cleaning the droplet separators, full-cone nozzles of the 490 series are suggested.

Nozzles for scrubbers and mist eliminators

Axial Flow Full Cone Nozzle for Scrubber, Series 403

Axial flow full cone nozzle for scrubbers, series 403

Very uniform spray pattern.

Applications:

  • Cleaning and washing processes in exhaust gas cleaning systems (SOx reduction)
  • Cooling of gaseous fluids and solids
  • Spraying over packings
fileadmin/media-usa/Literature/Catalog/Full_cone/Series_403_FullCone.pdf
Axial flow full cone nozzle for scrubbers, series 405

Axial flow full cone nozzle for scrubbers, series 405

Uniform full cone atomization.

Applications:

  • Cleaning and washing processes in exhaust gas cleaning systems (SOx reduction)
  • Cooling of gaseous fluids and solids
fileadmin/media-usa/Literature/Catalog/Full_cone/Series_405_FullCone.pdf
Axial flow full cone nozzle for scrubbers, series 419 "FreeFlow"

Axial flow full cone nozzle for scrubbers, series 419 "FreeFlow"

Resistant to clogging due to very large free cross-sections. Stable spray angles. Uniform full cone atomization.

Applications:

  • Cleaning and washing processes in exhaust gas cleaning systems (SOx reduction)
  • Gas washing
  • Spraying over packings
  • Dust control
  • Absorption
fileadmin/media-usa/Literature/Catalog/Full_cone/Series_419.pdf
Axial flow full cone nozzle for scrubbers, series 421

Axial flow full cone nozzle for scrubbers, series 421

Uniform full cone atomization, high flow rates.

Applications:

  • Cleaning and washing processes in exhaust gas cleaning systems (SOx reduction)
  • Surface sprinkler system
  • Cooling and purification of gases
  • Water recooling
  • Column sprinkling and improvement of chemical reactions by surface enlargement
fileadmin/media-usa/Literature/Catalog/Environmental/Series_421.pdf
Tangential flow full cone nozzle, series 422/423

Tangential flow full cone nozzle, series 422/423

Tangentially arranged liquid supply. No swirl inserts. Non-clogging. Stable spray angle. Uniform atomization.

Applications:

  • Cleaning and washing processes such as windscreen washing, ABC protection, droplet separator washing
  • Foam control
  • Cooling of gaseous fluids and solids
fileadmin/media-usa/Literature/Catalog/Full_cone/422_series_ship.pdf
Lechler Mist Eliminator System

Lechler Mist Eliminator System

Modular, compact, combinable and efficient. The different Lechler Droplet Separator Systems can be combined with each other, depending on individual requirements in relation to efficiency and space.

Applications:

  • Exhaust gas cleaning in wet scrubbers
  • Protection of downstream systems
  • Operating cost reduction
Mist Eliminator Systems