RU98114337A - DIRECT STEAM GENERATOR WITH SPIRAL LOCATED EVAPORATING PIPES - Google Patents

Claims (2)

1. A once-through steam generator with a gas duct (4) formed from steam generator pipes (10) hermetically welded to each other through fins (13), moreover, the steam generator pipes (10) for fluid flow are connected in parallel and have a surface structure on their inner side for obtaining high heat transfer from their inner wall to the fluid, and in the heating region (V) of the gas duct (4) are arranged approximately in the form of a spiral winding, and each pipe of the steam generator (10) is designed so that a pair of pipe lengths (L) in the region The parts of heating (V) and the external diameter of the pipe (d) points lie in the coordinate system on approximately one straight line (A, B, C), which is defined for the fin width 12 mm by points defined by pairs of values L = 59.7 m, d = 31.8 mm and L = 93.6 m, d = 44.5 mm, for a fin width of 16 mm by points defined by pairs of L = 64.7 m, d = 31.8 mm and L = 99.8 m, d = 44.5 mm, or for a fin width of 20 mm by points defined by pairs of values L = 70.6 m, L = 31.8 mm and L = 106.9 m, d = 44.5 mm.  2. A once-through steam generator according to claim 1, characterized in that the inner diameter of the pipes of the steam generator (10) in the upper region (21) of the heating region (V) is larger than in the lower region (22).