Countercurrent systems are effective on petroleum products with molecular weights lower than No . 2 fuel oil.
2.
Urey suggested that a more efficient but technically more complicated countercurrent system be used instead of the previous flow-through method.
3.
Because of the higher temperature and volume of the purge gas, the baghouse and all other downstream processing equipment must be larger than in a countercurrent system.
4.
Cocurrent systems do have several advantages over countercurrent systems : The afterburner is located upstream of the baghouse ensuring that fine particles are decontaminated; and because the heated purge gas is introduced at the same end of the drum as the feed soil, the soil is heated faster, resulting in a longer residence time.
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