A urea plant's natural gas requirement is a function of both the quality (heating value) of the gas being supplied as well as the energy efficiency of the unit.
A standard cubic metre (scm) of gas generates anywhere from 8,000 to 10,000 Kcal of energy, while being higher at the landfall or onshore entry point and lower as it is transported along pipelines to distant areas.
The energy consumption for producing one tonne of urea is 5.5-6 million Kcal for gas-based plants, whereas it is higher for units operating on naphtha (7-7.5 million Kcal) and fuel oil (7.5-8 million Kcal).
Taking an average calorific value of 8,200 Kcal/scm and a specific energy consumption of 6.2 million Kcal for every tonne of urea, the gas requirement for one million tonnes of urea comes to 756.1 million metric scm or 2.3 million metric scm/day (mmscmd) over 330 working days.
For 30 million tonnes of urea, the total requirement, then, works out to about 70 mmscmd.
Source: Hindu Business Line
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