Cracking furnaces are among some of the most complex operations in chemical process industries (CPI) plants. Consider, for example, the cracking furnaces in ethylene plants. In the past, an ethylene plant may have had 16—20 furnaces that produced about 30 million lb/yr of ethylene each. Today, plants are built with only 6-8 furnaces with capacities of over 200 million lb/yr each.
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