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Coal Washing/Mini Coke Oven/CDQ
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Mini Coke Oven
Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coall. Cokes made from coal are grey, hard, andporous. While coke can be formed naturally, the commonly used form is man-made. The form known as Petroleum coke, or pet coke, is derived from oil refinery coker units or other cracking processes.
Coke is used in preparation of producer gas which is a mixture of carbon monoxide and nitrogen. Producer gas is produced by passing air over red hot coke.
The bulkspecific Gravity of coke is typically around 0.77. It is highly porous.
The most important properties of coke are ash and sulfur content, which are linearly dependent on the coal used for production. Coke with less ash and sulfur content is highly priced on the market. Other important characteristics are the M10, M25, and M40 test crush indexes, which convey the strength of coke during transportation into the blast furnaces; depending on blast furnaces size, finely crushed coke pieces must not be allowed into the blast furnaces because they would impede the flow of gas through the charge of iron and coke. A related characteristic is the Coke Strength After Reaction (CSR) index; it represents coke's ability to withstand the violent conditions inside the blast furnace before turning into fine particles.
The water content in coke is practically zero at the end of the coking process, but it is often water quenched so that it can be transported to the blast furnaces. The porous structure of coke absorbs some water, usually 3-6% of its mass. In more modern coke plants an advanced method of coke cooling uses air quenching.
Bituminous coal must meet a set of criteria for use as coking coal, determined by particular coal assay techniques.
Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coall. Cokes made from coal are grey, hard, andporous. While coke can be formed naturally, the commonly used form is man-made. The form known as Petroleum coke, or pet coke, is derived from oil refinery coker units or other cracking processes.
Coke is used in preparation of producer gas which is a mixture of carbon monoxide and nitrogen. Producer gas is produced by passing air over red hot coke.
The bulkspecific Gravity of coke is typically around 0.77. It is highly porous.
The most important properties of coke are ash and sulfur content, which are linearly dependent on the coal used for production. Coke with less ash and sulfur content is highly priced on the market. Other important characteristics are the M10, M25, and M40 test crush indexes, which convey the strength of coke during transportation into the blast furnaces; depending on blast furnaces size, finely crushed coke pieces must not be allowed into the blast furnaces because they would impede the flow of gas through the charge of iron and coke. A related characteristic is the Coke Strength After Reaction (CSR) index; it represents coke's ability to withstand the violent conditions inside the blast furnace before turning into fine particles.
The water content in coke is practically zero at the end of the coking process, but it is often water quenched so that it can be transported to the blast furnaces. The porous structure of coke absorbs some water, usually 3-6% of its mass. In more modern coke plants an advanced method of coke cooling uses air quenching.
Bituminous coal must meet a set of criteria for use as coking coal, determined by particular coal assay techniques.