FIELD: power engineering; recovery of stack gases of natural-gas burning plants. SUBSTANCE: chimney stack accommodates following components mounted above outlet bore of its chimney shaft and joined together: economizer with overflow device and cold-water carrying pipe, droplet trap, and blast-air chamber with induced-draft fan; such arrangement forms multifunctional vertical economizer column provided with heat insulation. EFFECT: improved effectiveness of utilizing heat of stack gases; reduced space requirement. 2 dwg
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