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.
What is the purpose of flue gas desulfurization?
SNOX Flue gas desulfurization removes sulfur dioxide, nitrogen oxides and particulates from flue gases; Dry sorbent injection systems that introduce powdered hydrated lime (or other sorbent material) into exhaust ducts to eliminate SO2 and SO3 from process emissions.
What is flue gas desulfurization technology?
Flue gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from exhaust flue gases of fossil-fuel power plants, as well as from the emissions of other sulfur oxide emitting processes. When using a wet FGD scrubbing process, wastewater is generated, which must be treated before disposal.
Where is flue gas desulfurization used?
Flue Gas Desulfurization Systems: Scrubbers They are used in coal-and-oil fired combustion units including utility and industrial boilers, municipal and medical waste incinerators, petroleum refineries, cement and lime kilns, metal smelters, and sulphuric acid plants.
How is SO2 removed from flue?
The FDG or SO2 scrubbing process typically uses a calcium or sodium based alkaline reagent. The reagent is injected in the flue gas in a spray tower or directly into the duct. The SO2 is absorbed, neutralized and/or oxidized by the alkaline reagent into a solid compound, either calcium or sodium sulfate.
Is flue gas desulfurization a neutralization reaction?
Coal-based power stations are retrofitted with flue gas desulphurization units where sulphur dioxide is transformed into gypsum. The flue gases from smelting furnaces contain fluoride, which interact with lime particles through the process of dry-neutralization. Micronized fluorided lime (MFL) is the result.
What is the meaning of flue gases?
: the mixture of gases resulting from combustion and other reactions in a furnace, passing off through the smoke flue, composed largely of nitrogen, carbon dioxide, carbon monoxide, water vapor, and often sulfur dioxide, and sometimes serving as a source from which carbon dioxide or other compounds are recovered.
Which of the following is are wet method to control SOx from the flue gases?
In wet FGD processes, flue gases are scrubbed in a liquid or liquid/solid slurry of lime or lime- stone. Wet processes are highly efficient and can achieve SOx removal of 90% or more. With dry scrubbing, solid sorbents capture the sulfur ox- ides.
How are NOx and SOx formed?
SOx or sulphur oxides are formed during combustion process in the engine because of presence of sulphur content in the fuel. Read More about it here. Following are the methods and technologies used to reduce sulphur emission from marine engines. 8.
What is flue gas in boiler?
Flue gas is the gas exiting to the atmosphere via a flue, which is a pipe or channel for conveying exhaust gases from a fireplace, oven, furnace, boiler or steam generator. Quite often, the flue gas refers to the combustion exhaust gas produced at power plants.
What are the types of flue gas?
What is in the flue gas? Flue gases are a mixture of combustion products and include water vapour, carbon dioxide, particulates, heavy metals and acidic gases.
Why do we get flue gas?
Flue gas treatment, a process designed to reduce the amount of pollutants emitted from the burning of fossil fuels at an industrial facility, a power plant, or another source.