FIELD: heat and power engineering, possibly manufacture of heat exchange units of apparatuses for recovering exhaust gas heat of aggregates, particularly for heating air by means of exhaust combustion products from compressor of gas turbine plant of gas pumping aggregate in compressor stations of main gas conduits.
SUBSTANCE: method comprises steps of making in manufacturing stations blanks of shells of housings manifolds for supplying and discharging heated air, tubes and tube walls, members of unit carcass; bending tubes for forming four-way bent in horizontal plane tubes having successively changed along length two outer and two inner branches and three elbows joining said branches; in each, mainly in odd row forming two tubes with bent portions having length πR where R - radius of tube; forming bent portions of one tube in its inner elbow and forming bent portions of other tube in two outer elbows; forming other tubes of odd and even rows with bent portions having length πR/2 and joining them by means of rectilinear inserts with successively changed length values. In each row two inner branches of each next tube of row with joining elbow are formed in such a way that they are inscribed from outside into bending formed by respective branches and by joining them elbow of previous tube of said row. Minimum-length tube of each row has development length lmin consisting at least 0.75 of development length lmax of maximum -length tube of row. After making bent tubes, said tubes are pressurized; manifolds for supplying and discharging air are assembled and tube walls are welded-in to them. Unit carcass and manifolds for supplying and discharging air are mounted; tubes are packed and they are again pressurized together with manifolds.
EFFECT: enhanced effectiveness of manufacturing process.
10 cl, 14 dwg
