FIELD: petroleum refining industry; recovery of heat of waste flue gases. SUBSTANCE: air preheater includes rotary housing with central insert with circulating intermediate heat-transfer agent in form of coarse sand, bypasses formed by rows of helical plates and intermediate shells, row of buckets articulated with bypasses and rods for regulation of amount of sand in zones, ports in having closed by grates, baffle in form of perforated truncated cone and condenser with vertical enameled Field tubes. EFFECT: reduced metal usage; low temperature of waste flue gases; reduced amount of emissions into surrounding medium. 4 dwg
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