Flue gas desulphurization systems

Merrick, 1989. David Merrick and Jan Vernon, "Review of Flue Gas Desulphurization Systems," Chemistry and Industry, February 6, 1989. 

In flue gas desulphurization systems, equipment such as absorber towers, demister supports, gas outlets, recycle and process pipings, process tanks, and agitators are highly exposed to corrosive and abrasive environments. Chlorobutyl rubber of 60 Shore A... 

Rubber Compound Development for FGD (Flue Gas Desulphurizing) Systems [8]... 

However, to take into account similar levels of environmental protection for both nuclear and coal-fuelled plants, it is more useful to take as reference the coal-fuelled plant equipped with a flue gas desulphurization system. Figure 4.3 shows that in the competition with coal-fired plants equipped with desulphurization the nuclear power plant may be well competitive with coal-fired plants which show the given coal prices and fore costs. 

Bottom ash from power stations is less of a problem compared with fly ash for the contamination of natural waters firstly because the proportions of fly ash to bottom ash are approximately three to one and a greater proportion of the bottom ash is used (ECOBA 2003). Secondly, the volatile elements are depleted compared with fly ash (Clarke Sloss 1992). Other combustion residues include fluidized-bed boiler ashes and the products from flue gas desulphurization (FGD). The non-regenerable FGD systems commonly use limestone, slaked lime, or a mixture of slaked lime and alkaline fly ash that are sprayed into the flue gases to remove SO2 (Clarke Sloss 1992). Although 90 wt% of the product is used to replace natural gypsum in plasters and wallboards, there is currently a small excess production in Europe of that is disposed of in landfill and equivalent sites (ECOBA 2003). Because the FGD plant treats the cooled flue gases volatile elements are concentrated and there will be similarities with fly ash. 

The SVZ plant produces synthetic gas or fuel gas at atmospheric or elevated pressure, with the recovery of minerals in slag. There is a partial gas conditioning (CO shifting), a gas pnrification system with flue gas desulphurization. This plant is characterized by a high thermal efficiency and a flexible feedstock. A 120 000 t/a methanol plant is associated with it. 

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