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.
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.
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 mist eliminators 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 mist eliminators 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.
Nozzles and mist eliminators 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 mist eliminators reduce the emission values from the stack. Here, mist eliminators for vertical inflow are used above all.
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 mist eliminator.
For cleaning the mist eliminators, full-cone nozzles of the 490 series are suggested.
Very uniform spray pattern.
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Uniform full cone atomization.
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Resistant to clogging due to very large free cross-sections. Stable spray angles. Uniform full cone atomization.
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Uniform full cone atomization, high flow rates.
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Tangentially arranged liquid supply. No swirl inserts. Non-clogging. Stable spray angle. Uniform atomization.
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Modular, compact, combinable and efficient. The different Lechler Mist Eliminator Systems can be combined with each other, depending on individual requirements in relation to efficiency and space.
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