Abstract:
Herein a boiler tube (2) having a longitudinal extension (L) and comprising radially inner and outer tubular portions (4, 6) extending along at least a first part (5) of the longitudinal extension (L). The radially outer tubular portion (6) is metallurgically bonded to the radially inner tubular portion (4). A sensor space (8) is arranged between the radially inner tubular portion (4) and the radially outer tubular portion (6), wherein the sensor space (8) is configured to accommodate a sensor arranged to detect a physical property of the radially outer tubular portion (6). A duct (10) is connected to the sensor space (8) and extends through the radially outer tubular portion (6) to an exit portion (12) of a surface of the radially outer tubular portion (6). The radially inner and outer tubular portions comprise materials of different chemical composition. Also, a boiler tube unit and a furnace are disclosed herein.
Abstract:
A steam generator is described in which a combustion chamber has at least one combustion chamber wall formed by a plurality of longitudinal furnace tubes for passage of an evaporatable flow medium, connected together in gas-tight manner by tube webs. As will be familiar different tubes are likely to be subjected to a heat input in use that varies when the combustion chamber is fired. The tube bores of the furnace tubes are larger where subject to higher heat input than where subject to lower heat input. In particular the tube bores of the furnace tubes are generally larger in the middle region of the combustion chamber wall than at the transversely peripheral regions of the combustion chamber wall.
Abstract:
Ein zur Herstellung eines bei hohen Dampfdrücken betreibbaren Durchlaufdampferzeugers (1) geeignetes Verfahren soll nicht unverhältnismäßig teuer oder technisch aufwendig sein. Dazu wird erfindungsgemäß eine Anzahl von zur Bildung der Dampferzeugerrohre (12) vorgesehenen, aus einem Material einer ersten Materialkategorie gefertigten Rohrsegmenten (18) zu einer Anzahl von Modulen (17) zusammengefasst, wobei jedes Modul (17) an einer Anzahl von für eine Zusammenschaltung mit einem weiteren Modul (17) vorgesehenen Verbindungsstellen mit je-weils einem aus einem Material einer zweiten Materialkategorie gefertigten Übergangsstück (19) versehen wird.
Abstract:
The invention relates to a method for utilizing heat, in which a working medium inside a rapidly rotating rotor (5) is brought into thermal contact with an inner heat transfer surface (6a) of an annular gas chamber (6) in order to dissipate heat at a low temperature and in which a working medium is brought into contact with an outer heat transfer surface (6b) of the annular gas chamber (6) in order to absorb heat at a higher temperature. An improved efficiency is achieved in that the heat transfer in the area of the inner heat transfer surface (6a) is performed through thermal radiation preferably by way of radial lamellae (9, 10) which are in thermal connection with the gas chamber (6) on one side and with the working medium on the other. The invention further relates to a device for carrying out the method.