How is calcium oxide used in flue gas desulfurization?
How is calcium oxide used in flue gas desulfurization?
Calcium oxide (CaO – quicklime) or calcium hydroxide (Ca(OH)2 – hydrated lime), and calcium carbonate (CaCO3 – limestone or chalk) can each be used to neutralise the acidic gases and remove sulfur dioxide from flue gases.
What chemicals are in flue gas?
Typical flue gases from natural gas-fired power plants may contain 8-10% CO2, 18-20% H2O, 2-3% O2, and 67-72% N2; typical flue gases from coal-fired boilers may contain 12-14 vol% CO2, 8-10 vol% H2O, 3-5 vol % O2 and 72-77% N2.
What compound is used in the flue gas desulfurization?
Most FGD technologies use an alkali sorbent, such as limestone (calcium carbonate), quicklime (calcium oxide), hydrated lime (calcium hydroxide), or sometimes sodium and magnesium carbonate and ammonia, to capture the acidic sulfur compounds from the flue gas.
What is the process of flue gas desulphurisation?
In a flue gas desulphurisation system (FGD), sulphur compounds are removed from the exhaust emissions of fossil-fuelled power stations. This is done by means of an industrial process through the addition of absorbents. In this method, the flue gases are steam-saturated with the absorbent in aqueous solution.
How does flue gas desulfurization work?
How does it work? The FGD technology is based on a chemical reaction that occurs when the warm exhaust gases from the coal-fired boiler come into contact with limestone. This reaction removes 92% of the sulphur dioxide from the flue gas and converts the limestone into Calcium Sulphite.
How do you calculate flue gas composition?
Composition of the dry flue gas from the stoichiometric combustion of 1 kg of biomass: N2 from theoretical air = 4.94 × 0.79 = 3.90 m3. N2 from biomass = 0.001 × 0.224 = 0.0002 m3. CO2 from biomass = 4.33 × 0.224 = 0.97 m3.
What is calculated by flue gas analysis?
3. Which of the following is calculated by flue gas analysis? Explanation: The only practical way for determining the amount of air used in furnace is to analyse the flue gas for the constituents CO2, CO an O2.
What is the chemical formula of Sulphur dioxide?
SO₂Sulfur dioxide / Formula
How does flue gas desulphurisation work?
What is the wet flue gas desulfurization process?
Several wet flue gas desulfurization (FGD) processes are based on the absorption of sulfur dioxide in caustic suspension or absorption liquor. The dissolved sulfur dioxide, which we will refer to as S (IV), is neutralized by the additive, commonly lime or limestone [1].
Where does sulfur dioxide come from when it is desulfurized?
Before flue gas desulfurization was installed, the emissions from the Four Corners Generating Station in New Mexico contained a significant amount of sulfur dioxide. 2) from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes such as waste incineration .
Can “flue gas” desulfurization be used on board ships?
Different methods for “flue gas” desulfurization are used on conventional coal and oil-fired power plants, but, due to cost and space requirements, the methods have not been used on board ships.
What is the formula for calcium sulfite-sulfate hemihydrate?
Approximately the first 15 mole percent of the sulfate ions co-precipitate with sulfite to form calcium sulfite-sulfate hemihydrate [ (CaSO 3 ·CaSO 4) ·½ H 2 O]. Any sulfate above the 15% mole ratio precipitates with calcium as gypsum. Scrubber technology has advanced considerably over the past three decades.
