FIELD: heating system.
SUBSTANCE: inner part of the furnace chamber pipe has the supercritical pipe pressure and contains the grooves (36) on the inner peripheral surface with spiral shape to the pipe axis direction; and ribs (37), protruding inwards radially through the grooves (36), while in cross-section along the pipe axis direction, when the width (mm) of grooves (36) in the direction of the pipe axis is specified as Wg, height (mm) of ribs (37) in the radial direction is specified as Hr and the external pipe diameter (mm) is specified as D, the width Wg (mm) of grooves (36), Hr height (mm) of ribs (37) and the external pipe diameter D (mm) meet the ratio "Wg/(Hr*D)>0.40".
EFFECT: increased heat transfer at supercritical pressure.
18 cl, 15 dwg
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