What is the process of flue gas desulphurisation?

What is the process of flue gas desulphurisation?

Flue gas desulfurization is the process of removing sulphur compounds from the exhaust emissions of fossil-fueled power stations. This is done through the addition of absorbents, which can remove up to 95% of the sulphur dioxide from the flue gas.

How are flue gases cleaned?

Sulfur dioxide is removed by one of a number of processes, most of which involve scrubbers in one form or another. Most U.S. facilities rely on wet scrubbers, which use a slurry of alkaline sorbent (usually comprising limestone or lime) or seawater to clean the gases.

What is flue gas scrubbing?

Flue-gas scrubbing refers to the removal of pollutants from industrial exhaust systems. In general, a scrubber system uses liquids to remove pollutants, but, recently, scrubbers using dry reagents or slurries have been used successfully to limit particulate pollution, sulphur dioxide and other harmful emissions.

What is meant by flue gas desulphurisation FGD?

Flue gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO2) from flue gases produced from industrial combustion at petrol refineries, chemical manufacturing industries, mineral ore processing plants, and power stations to name a few.

Why do flue gases desulfurize?

Flue Gas Desulfurization (FGD) Processes. In many plants it is necessary to remove sulfur from the flue gases after the combustion process to meet environmental requirements.

Why is desulfurization important?

The desulfurization of natural gas is necessary for two very important reasons. The H2S that is present is not only toxic to workers and consumers but it is also detrimental to the very pipeline networks that deliver the fuel. At its worst, it can induce respiratory failure, coma and even death to those exposed.

How do scrubbers work?

A scrubber works by spraying a wet slurry of limestone into a large chamber where the calcium in the limestone reacts with the SO2 in the flue gas. There are some variations in design of scrubbers. For example, some scrubbers may use other chemicals such as lime or magnesium oxide to react with the SO2 in the flue gas.

Why is it called flue gas?

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 is meant by flue gas desulphurisation what is its importance?

Flue-gas desulfurization (FGD) is a set of technologies used to remove sulfur dioxide (SO. 2. ) from exhaust flue gases of fossil-fuel power plants, and from the emissions of other sulfur oxide emitting processes such as waste incineration.

What are the different methods used to control SO2 in flue gases?

The two major emissions control methods are sorbent injection and flue gas desulfurization: Sorbent injection involves adding an alkali com- pound to the coal combustion gases for reac- tion with the sulfur dioxide. Typical calcium sorbents include lime and variants of lime. Sodium-based compounds are also used.

What is the function of FGD?

The flue gas desulfurization (FGD) plant removes sulfur dioxides (SO2) from flue gas produced by boilers, furnaces, and other sources.

How do sulfur dioxide scrubbers work?

How does a scrubber work? Once sulfur is burned and produces SO2, the exhaust gas passes through the scrubber where a spray mixture of limestone (or other chemical reagent) and water reacts with the SO2. The reaction enables the SO2 to be removed before it’s released into the atmosphere.

What is desulphurization of flue gas?

In the process of desulphurization the gas is scrubbed with a recirculating limestone slurry, which removes almost 95% of the SO 2 from the flue gas. The process also removes almost all the HCl contained in the flue gas.

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 are the specific issues with the desulfurization process?

Specific issues include the degree of desulfurization that the process can offer as well as its flexibility.

What is the target of desulphurization of thermal power plant?

The target should be to maintain uniform ambient air quality across the country and not uniform emission norms for thermal power plants. What is flue gas desulphurisation? Removal of Sulfur Dioxide is called as Flue-gas Desulphurization (FGD).