System for steam generation according to the natural circulation principle, and method for reasons of the water circulation in such a unit

摘要

In order to ensure stable circulation conditions even during the start-up of a steam generation plant (1) on the natural circulation principle with an evaporator (8) in a steam generator (6) and with a steam drum (10) connected thereto on both the water and steam sides, on which there are a water supply line (12) and an operative steam outlet (14), the invention provides for a closable injector connection (24) between the water supply line (12) of the steam drum (10) and the evaporator (8), preferably on the water-side inlet (8a) of the evaporator (8), by-passing the steam drum (10). Thus the use of a cost-intensive starting circulation system is not necessary to ensure stable circulation even during the start-up phase.