It all started when a group of engineers from Gdańsk, Częstochowa and Silesian Technical University as well as the representatives of PRS and Maritime Office, Gdynia assembled to analyse a few technical solutions, the institutions were currently working on, and to apply them in the desulphurization of flue gases technology.
The assembly was held on the 3rd of June 2013 in the Department of Ship Power Plants, GdańskTechnicalUniversity.
A working prototype of the unit was built in a couple months. Soon, on the 3rd of September in the laboratory of the Department of Ship Power Plants, GdańskTechnicalUniversity the unit tests were carried out. The engineers of DNV were invited to the tests.
Tests were conducted in three stages. An exhaust analyser was installed to an exhaust manifold of a ship engine. At the first stage, the fuel widely available at petrol stations was used in the test. Sulphur content in this kind of fuel should fluctuate in the region 0,001%.
At the second stage the higher sulphur content fuel (around 1%) was used. The fuel with appropriate certificate was delivered by Gdańsk Rafinery.
At the third stage, the designed desulphurization of flue gases unit was mounted to the exhaust manifold of a ship engine working on higher sulphur content fuel. The experiment results were as expected. The chemical filter was distinguished by the high ability of absorption of SOX compounds.
Scrubbers is the informal name for flue gas desulfurization (FGD) technology which removes SOX emissions from the exhaust gas. A ship scrubber works by absorbing SOX and rinsing it with water. The water mixture is channeled out of a ship into the sea.
This system seems to be environment-friendly as it enables the SOX gases to be removed before it’s released into the atmosphere. However, the water that comes out of a ship is a chemical mixture which pollutes the sea environment.
Our solution prevents the air and sea environment from the pollution. The final product obtained in the process is captured in a tank and it is an important product for the trade.
It can be named “dry scrubber.” The base of the technology is a cheap chemical sorbent. Its ability to SOX absorption is distinguished by proportion one to one.
At first, the desulphurization of flue gases system mixes sorbent with exhaust fumes.
The chemical reaction undergoes at the temperature higher then 200 degrees Celsius that is why the system is fixed near the exhaust manifold. The reaction of exhaust fumes lasts between ten and twenty seconds. After that fumes are separated by cyclone filter and then channelled through a flexible hose to a tank.
Currently, the sorbent price is a bit higher then 50 euro per tonne. The amount of sorbent and the tank size are determined by the autonomy of the system. The figures are easily to estimate.
For example, 3% sulphur content fuel requires 30 kg of sorbent per tonne. This figure must be multiplied by the amount of daily used fuel and also by the number of working days.
The tank size must be twice bigger. The compound obtained in the reaction is environment-friendly and in addition it is a valuable product for the trade.