Frequent question: Why is it important to remove sulfur from coal and natural gas before they are burned?

Unlike carbon, sulfur is actually an undesired contaminant in fuels. This means that if all of the sulfur could be removed from fossil fuels before they are burned, sulfur emissions would be slashed and pollution curbed.

Why should sulfur be removed from coal?

When coal is burned to produce energy, its chemical makeup is changed and sulfur is released. To avoid environmental problems with the sulfur, coal companies and power plants take measures to remove it before, during and after burning.

Why is sulfur removed from fuels like coal and oil before they are burned?

Coal and oil contain sulfur impurities. When these fuels burn, the sulfur burns too which releases sulfur dioxide (SO 2) gas.

Why is sulfur a problem in burning coal?

When coals are burned, leached and washed, sulfur will be released in the form of sulfide and H2S, which then react with O2, water and other substances to change into vitriol, and in some places it may form acid rain. And they will impact water environment, acidify the soil and do great harm to plants and human health.

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What happens when you remove sulfur from coal?

Instead the coal is gasified under pressure with a mixture of air and steam. The resulting gas is expanded through a gas turbine to produce electricity. … As the coal is converted to gas the sulphur present is converted into hydrogen sulphide which can be easily removed and sold for use within the chemical industry.

Does burning coal produce sulfur dioxide?

Sulfur dioxide, SO2, is a colorless gas or liquid with a strong, choking odor. It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores (aluminum, copper, zinc, lead, and iron) that contain sulfur. Sulfur dioxide dissolves easily in water to form sulfuric acid.

Does Sulphur occur in petroleum?

Sulphur compounds usually occur in all fractions of crude oil but, generally, the heavier the fraction the higher the sulphur content. Some crude oils contain considerable quantities of hydrogen sulphide (H2S) which is a gas under ambient conditions and extremely toxic.

Is Sulphur can be used as a non polluting fuel?

Whereas carbon dioxide is a necessary byproduct of fossil fuel combustion, sulfur dioxide is not. Unlike carbon, sulfur is actually an undesired contaminant in fuels. This means that if all of the sulfur could be removed from fossil fuels before they are burned, sulfur emissions would be slashed and pollution curbed.

Does burning coal release mercury?

Human activities, however, are responsible for much of the mercury that is released into the environment. The burning of coal, oil and wood as fuel can cause mercury to become airborne, as can burning wastes that contain mercury.

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What gas do all fuels need to burn?

When a fuel burns in plenty of air, it receives enough oxygen for complete combustion. Complete combustion needs a plentiful supply of air so that the elements in the fuel react fully with oxygen. Fuels such as natural gas and petrol contain hydrocarbons. These are compounds of hydrogen and carbon only.

How do you reduce sulphur?

One option is to use coal that contains less sulfur. Another option is to “wash” the coal to remove some of the sulfur. The power plant can also install equipment called scrubbers, which remove the sulfur dioxide from gases leaving the smokestack.

How do you get rid of sulphur?

There are four stages where sulphur can be removed: in the blast furnace (BF), during hot metal (HM) pretreatment, in the converter and during the secondary metallurgy (SM) treatment. For sulphur removal a low oxygen activity and a basic slag are required.

Is coal bad for Earth?

Coal contains sulfur and other elements, including dangerous metals such as mercury, lead, and arsenic, that escape into the air when coal is burned. Burning coal also produces particulates that increase air pollution and health dangers. Burning coal emits large amounts of carbon dioxide into the atmosphere.

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