CONTINUOUS-FLOW STEAM GENERATOR WITH SPIRAL EVAPORATION TUBES

摘要

The invention concerns a continuous-flow steam generator (2) with a gas flue made up of evaporation tubes (10) welded together with fins (13) to form a gastight seal. The tubes (10) are connected in parallel to allow a fluid to flow through them, have on their inside surface a structure designed to produce strong turbulence in the fluid flowing through them and are wound in an essentially spiral coil in the firing area (V) of the flue. In order to be able to operate a steam generator (2) of this kind under low loads of for instance about 20 % of the design load without causing excessive thermal stresses, the invention calls for the evaporation tubes (10) to be designed so that the geodesic losses in pressure in the fluid flowing through the tubes are at least 0.5 times the losses in pressure due to friction.