Total capital costs vary from $60 to $100/kw and $94 to $145/kw, respectively, for the limestone and sodium solution scrubbing systems for this model plant. Higher capital costs are often required for application of FGD systems to existing plants than for application to sim- ilar new plants.
What is the key chemistry principle behind flue gas desulfurization?
2 INTRODUCTION. Several wet flue gas desulfurization (FGD) processes are based on the absorption of sulfur dioxide in caustic suspension or absorption liquor. The dissolved sulfur dioxide, which we will refer to as S(IV), is neutralized by the additive, commonly lime or limestone [1].
What does the FGD system Remove from the flue gas?
The Flue-Gas Desulfurization (FGD) process utilizes a set of technologies to remove sulfur dioxide (SO2) from the flue gas emissions of coal-fired power plants. For a typical coal-fired power plant, FGD systems will remove ~95% of the SO2 in the flue gases.
How does flue gas desulfurization FGD work?
How does it work? The FGD technology is based on a chemical reaction that occurs when the warm exhaust gases from the coal-fired boiler come into contact with limestone. This reaction removes 92% of the sulphur dioxide from the flue gas and converts the limestone into Calcium Sulphite.
What is the cost of FGD?
Summary Statistics: Benchmark Operations
| Average | Maximum | |
|---|---|---|
| FGD unit capital costs (US$, millions) | 133 | 462 |
| Operating costs, fixed (US$, millions) | 3.3 | 11.5 |
| Operating costs, variable (US$, millions) | 6.7 | 23.2 |
| Total annual FGD unit cost (US$, millions) | 23.5 | 81.7 |
What is the disadvantage of wet limestone scrubbing?
Other drawbacks of wet-limestone scrubbing are large up-front capital costs, large equipment size and substantial predictive and corrective maintenance requirements. Substituting hydrated lime as the reagent reduces equipment size and costs, but increases reagent costs and material handling issues.
How do you remove sulfur dioxide?
It is possible to scrub sulfur dioxide by using a cold solution of sodium sulfite; this forms a sodium hydrogen sulfite solution. By heating this solution it is possible to reverse the reaction to form sulfur dioxide and the sodium sulfite solution.
What does a flue gas desulphurisation plant do?
Desulphurization is the removal of Sulphur Dioxide . The flue gas desulphurisation plants remove sulphur dioxides from the flue gas which is produced by boilers, furnaces, and other sources. Let us read in detail about the flue gas desuplhurisation.
How does flue gas desulfuristion work?
Flue-gas desulfurization is an absorption process by which sulfur dioxide in flue gas from fossil-fuel power plants and from the emissions of other sulfur-oxide-emitting processes can be controlled. SO 2 is removed from flue gases by a variety of methods, common ones being:
Is flue gas harmful?
The impurities in the flue gas are harmful if they are emitted to the atmosphere. Flue gas cleaning must be installed to eliminate or at least reduce this problem.
What are flue gases?
Flue gas—the emitted material produced when fossil fuels such as coal, oil, natural gas, or wood are burned for heat or power—may contain pollutants such as particulates, sulfur dioxide, mercury, and carbon dioxide. Most flue gas, however, consists of nitrogen oxides.
