The Gypsum obtained after the exhaust gas cleaning process can be sold for use in various industrial applications, Disadvantages
Ships can either carry fresh water in tanks or generate the required water from. To increase the contact time between the scrubbing material and gas, packed beds consisting of gas-pollutant removal reagents (such as limestone), are used inside the scrubbers. There are two primary methods of scrubbing exhaust: wet and dry scrubbing. MARPOL regulations require that the wash water used has to be monitored before being discharged to ensure that its PH value is not too low. As the system can run on lower costing fuels for longer periods of time and around the world, they can overcome their high initial costs in order to economically meet with the international regulations. Removing the sulfur oxides is fairly simple, the flue gases pass through a spray of water in a wet scrubber that contains a variety of chemicals. How will you do maintenance of a wet scrubber? 2. Disadvantages: It works on similar principals to an open loop system; it uses fresh water treated with a chemical (usually sodium hydroxide) instead of seawater as the scrubbing media.

The SOx from the exhaust gas stream is converted into harmless sodium sulphate. The volume and weight of the liquid are very great and are some of the main reasons that dry scrubbing was developed. Scrubbing, sometimes referred to as flue gas desulfurization is the most effect sulfur-removal technique that is in widespread use. In these types of scrubbers, water is not used as a scrubbing material, instead, pellets of hydrated lime are used to remove sulphur. Dry scrubbers employ solid lime as the alkaline scrubbing material which removes sulphur dioxide from exhaust gasses. 1. 3. 2. Cooling of exhaust gas is a problem with wet scrubbing systems. Since the vapor in these gasses is very low, they are typically dark or invisible when vented. The most commonly used additives used are caustic soda (NaOH) and Limestone (CaCO3). 4. Scrubbers may use sea water, fresh water with added calcium/sodium sorbents or pellets of hydrated lime as the scrubbing medium because of their alkaline nature. SO2 (gas) + H2O + ½O2 → SO42-  +  2H+ ; Requires large storage space for chemicals and additives. The system produces very little waste material, at least when compared to a wet scrubber. Scrubbing liquid is sprayed into the exhaust gas stream through nozzles to distribute it effectively.

This is both better for the environment and allows a company to recoup some of the expense of the wet scrubber system. Some contaminants, such as mercury, are extremely harmful and can only be removed by a wet compound. More structural modifications are needed to employ this system. 1. 3. The first air scrubber was designed to remove carbon dioxide from the air of an early submarine, the Ictineo I, a role for which they continue to be used today. The operation of the system depends upon the alkalinity of water available and is not suitable to 3. be employed in all conditions. [3] This calcium sulfite either falls out of the gas stream or is removed with other particulates. However, sea water which is at high ambient temperature, fresh water and even brackish water, is not effective and cannot be used. This system does not require storage for waste materials They require significant onboard storage to handle the dry bulk reactants and products associated with the process.

Since the alkalinity of seawater varies due to the number of reasons such as the distance from land, volcanic activity, marine life present in it etc, wet scrubbers are divided into two types; open loop and closed loop systems. However, they weigh much more than wet systems.
Although there are many positive side-effects of using scrubbers, there are still waste products from the scrubbing process whether wet or dry scrubbing is used. This reduces the cost of the system as well as removes the cost of transporting and storing the waste water. Related Read: Understanding Components and Design of Exhaust Gas System of Main Engine On Ship. 2. Ships can either carry fresh water in tanks or generate the required water from freshwater generators present on board. An open loop scrubber for these reasons is not considered as a suitable technology for areas such as the Baltic where salinity levels are not high. 3. Is the capacity of the capacity of the Holding tank in any document or drawing?


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