What is coal gasification chemistry?

Coal gasification is the process of producing syngas—a mixture consisting primarily of carbon monoxide (CO), hydrogen (H2), carbon dioxide (CO2), natural gas (CH4), and water vapour (H2O)—from coal and water, air and/or oxygen. Historically, coal was gasified to produce coal gas, also known as “town gas”.

Is produced from underground gasification of coal?

Underground coal gasification (UCG) is an industrial process which converts coal into product gas. The product gas is brought to the surface through production wells drilled from the surface. The predominant product gases are methane, hydrogen, carbon monoxide and carbon dioxide.

How does coal gasification work?

Gasification of coal is a process in which coal is partially oxidated by air, oxygen, steam or carbon dioxide under controlled conditions to produce a fuel gas. The hot fuel gas is cooled in heat exchangers, with the production of steam, and cleaned before combustion in a gas turbine.

What is coal gasification reaction Class 11?

Answer: Coal gasification is defined as the process of producing syngas from coal. Syngas (also called water gas) is a mixture of carbon monoxide gas and hydrogen gas, which is used in the synthesis of methanol and a number of hydrocarbons.

Is coal gasification viable?

Old and new. The main technology being used is coal gasification – instead of burning the fossil fuel, it is chemically transformed into synthetic natural gas (SNG). The process is decades old, but recent rises in the price of gas mean it is now more economically viable.

How can you prepare dihydrogen from coal?

The production of dihydrogen obtained from coal gasification can be increased by reacting carbon monoxide of syngas mixture with steam in presence of a catalyst iron-chromium.

Which is the best way to gasify coal?

Underground coal gasification (UCG) is a promising option for the future use of un-worked coal. UCG permits coal to be gasified in situ within the coal seam, via a matrix of wells.

What kind of chemistry is used in gasification?

Detailed Gasification Chemistry. Trace elements associated with both organic and inorganic components in the feed, such as mercury, arsenic and other heavy metals, appear in the various ash and slag fractions, as well as in gaseous emissions, and need to be removed from the syngas prior to further use.

How does the chemical reaction of gasification progress?

The chemical reactions of gasification can progress to different extents depending on the gasification conditions (like temperature and pressure) and the feedstock used.

What kind of trace elements are in coal feed?

Trace elements associated with both organic and inorganic components in the feed, such as mercury, arsenic and other heavy metals, appear in the various ash and slag fractions, as well as in gaseous emissions, and need to be removed from the syngas prior to further use.