Subject :- engineering chemistry

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Subject - engineering chemistry

• PRESENTED BY

• Dolly vyas
• Branch EC 8TH SEM
• Adina institute of science technology

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Question

• What do understand by HTC and LTC of a coal ?
  Write down the usefulness of each process .

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estANSWER

• HTC and LTC are the two type of carbonization
  process of coal.
• Carbonization process used for producing
  fuels-solid, liquid, and
• gaseous from coal and other carbonaceous
  material.

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HTC PROCESS

• The HTC process is define as the high temperature
  carbonization process.
• It is carried out 900-1200c with the object of
  producing coke.
• The advantage of this process is that the coke
  obtained in it is of the right porosity, hardness
  ,purity , strength, etc.
• So that it can be used in metallurgy.

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• In this process all the volatile matter of coal
  is driven off and the yield of coke is about
  65-75.
• It containing only 1-3 volatile matter.
• The by product gas produced is high in volume
  (about 300-390 m3/ tonne).
• But there is a drawback is that its calorific
  value is very low about 5400-6000 kcal/m3).

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LTC PROCESS

• The LTC process is define as the low temperature
  carbonization process.
• In this process the heating of coal is carried
  out at 500-700c.
• The yield of coke is about 75-80 and it contains
  about 5-15 volatile matter.
• Drawback is in this process is that it is not
  mechanically strong , so it can not be used as a
  metallurigical coke.

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• But advantage is that it burns easily giving
  practically a smokeless, hot and radiant fire .
• Hence it is suitable for domestic purpose.
• The by product gas produced in this process is
  about 135-150 m3/ tonne.
• The best thing is that in this process we get
  more valuable gaseous fuel.