Coke Strength after Reaction (CSR) refers to
coke "hot" strength, generally a quality reference in a simulated reaction condition in an industrial
blast furnace. The test is based on a procedure developed by
Nippon Steel Corp in the 1970s as an attempt to get an indication of coke performance and is used widely throughout the world since then. It is one of the major considerations when blending
coking coal for export sale.
Test procedure
The coke sample is first tested for its reactivity (CRI), then the same sample is tested for strength (CSR).
Reactivity test
A 200 g sample of 19–21 mm particle range coke is heated at 1100°C under 1
atmosphere pressure of
carbon dioxide
Carbon dioxide is a chemical compound with the chemical formula . It is made up of molecules that each have one carbon atom covalent bond, covalently double bonded to two oxygen atoms. It is found in a gas state at room temperature and at norma ...
for 2 hours. Next, the coke is cooled under
nitrogen
Nitrogen is a chemical element; it has Symbol (chemistry), symbol N and atomic number 7. Nitrogen is a Nonmetal (chemistry), nonmetal and the lightest member of pnictogen, group 15 of the periodic table, often called the Pnictogen, pnictogens. ...
and the weight loss resulting from reaction is measured. The percentage weight loss is known as reactivity (CRI).
Strength test
The reacted coke is placed in an I-type drum (no lifters) and subjected to 600 revolutions in 30 minutes. The percent of
carbon
Carbon () is a chemical element; it has chemical symbol, symbol C and atomic number 6. It is nonmetallic and tetravalence, tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiting 4 ...
material removed from the drum that is ≥10 mm is known as the coke strength after reaction (CSR).
[Reifensteinin (2003) ACARP Report C12004 Coke Reactivity Test: Critical Parameters]
References
Solid fuels
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