What is meant by desulphurization?

What is meant by desulphurization?

Definition of desulfurization : the removal of sulfur or sulfur compounds (as from coal or flue gas)

Why is desulphurization needed?

Sulphur is a desirable element in steel when good machinability is needed from the steel product. Hence, it is important, from a process and economical point of view, to remove most of the sulphur from hot metal before it enters the BOF. …

What is desulphurization of coal?

Some methods have been applied to coal to remove its inorganic materials from the organic part. Most of the effective coal desulfurization techniques are based on chemical methods. Main desulfurization methods are chemical desulfurization, leaching, extraction, flotation, oxydesulfuriza- tion and biodesulfurization.

What is petroleum desulphurization?

Desulfurization is the process of removing sulfur from crude oil (or its fractions). It prevents contamination and also improves the efficiency of petroleum. Desulfurization removes elemental sulfur and its compounds from solids, liquids and gases.

How do you remove sulfur from fuel oil?

The current industrial method for removal of sulfur from fuels is hydrodesulfurization (HDS), which is a high temperature, high pressure catalytic process. This makes HDS a very costly option for deep desulfurization.

How do you remove sulphur from steel?

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.

What is desulphurization in steel?

The principle of desulphurization is to transfer the sulfur dissolved in the liquid steel to a CaO-rich slag phase. This process is typically carried out in a ladle furnace (LF). The slag must be fully liquid (liquid fraction > 0.9). This is required for kinetic reasons.

What are the favorable conditions for desulphurization?

For better desulphurisation1,11,23 the following conditions should be fulfilled: Oxygen activity in the HM (a[O]) should be as low as possible (Equation 2). Carbon should be high (it reacts with oxygen and thus reduces a[O]). Silicon should be high (it reacts with oxygen as well and thus reduces a[O]).

How do you remove so2 from flue gas?

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 is the drawback of sulphur in 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.

Is obtained by refining of crude oil?

Petroleum refining processes are the chemical engineering processes and other facilities used in petroleum refineries (also referred to as oil refineries) to transform crude oil into useful products such as liquefied petroleum gas (LPG), gasoline or petrol, kerosene, jet fuel, diesel oil and fuel oils.

What is desulfurization and how is it done?

Desulfurization is the removal of sulfur or sulfur compounds (as from coal or flue gas), mostly from fuels.

What is desulphurization of crude oil?

Corrosionpedia explains Desulphurization. Crude oil with a higher concentration of hydrogen sulfide is referred to as sour, while crude oil with a lower concentration of hydrogen sulfide is referred to as sweet.

What is dry desulfurization in biomethane?

Zhao Youcai, Wei Ran, in Biomethane Production from Vegetable and Water Hyacinth Waste, 2021 Dry desulfurization is precision desulfurization. The equipment’s fundamental principle of dry desulfurization is oxidizing the H2 S to sulfur or sulfur oxides, which can be described as a dry oxidation process.

What is the difference between wet and dry desulfurization of H2S?

After the concentration of H 2 S is desulfurized to <150 mg/m 3 by wet desulfurization, the precision desulfurization by ferric oxide is carried out to 15 mg/m 3. The dry desulfurization adopts a vertical dry desulfurization mode.