Question

Differentiate between high temperature and low temperature carbonization of coal

Answer 1

Explanation:

Low temperature carbonization : It is done at a temperature off about 500-700 C. It produces semi coke due to incomplete carbonization of coal. ... High Temperature Carbonization : Done at a temperature range of 900-1100 C. It produces metallurgical coke.

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Answer 2

Answer:

The term "carbonization" refers to the heating of coal without the presence of air. The removal of volatile matter (VM) takes place in these conditions. Since the volatile coal contains more hydrogen than the base coal does, the volatile coal becomes more carbonized.

              In a kiln or retort (pyrolysis), the biomass feedstock is typically heated to temperatures around 400°C (often between 300 and 900°C) without the presence of air [10,11]. The resultant biochar is a porous, carbon-rich, grayish-black material also known as charcoal.

The difference between the high temperature and low temperature carbonization of coal are as follows-

• Low-Temperature Carbonization is the term used to describe the process of heating coal to temperatures between 400 and 700°C. when the coal is heated to a temperature between, let's say, 900° and 1300°C. This process is known as high-temperature carbonization, and it is used in India.

• By heating solid fuels to 500–650 °C without the use of air, low-temperature carbonization produces low-temperature coke and volatile compounds, which are then captured and processed.

• At temperatures above 900 degrees Celsius, high-temperature carbonization takes place. The yield of gaseous products from this carbonization is higher than the yield of liquid products.
• Hard coke is produced by this carbonization, which is typically used to create metallurgical coke from coking coals.

• Utilizing wet feedstock or treating dry feedstock with water in its sub-critical state, i.e., at temperatures between 180 and 250 °C and pressures between 2 and 6 MPa, is a need for the HTC process.

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