摘要:
A vapor generator in which a plurality of tubes are connected together and arranged to form at least a portion of the boundary walls of a gas-tight enclosure. Portions of the tubes are bent to form a plurality of openings extending through at least one of the boundary walls. Some of the bent tube portions extend around the openings in the plane of the wall, and others of the bent tube portions extend out of the plane of the wall. The tubes, including the bent portions, extend at an angle with respect to a horizontal plane for their entire lengths to enable the tubes to drain. A burner is associated with each opening to apply heat to the enclosure, and fluid is passed through the tubes to apply heat to the fluid.
摘要:
The vapor generator is provided with a vapor separator which is connected to an outlet of the partition and which has a water outlet connected to the inlet of the enclosing walls of the combustion chambers. The vapor outlet of the vapor separator connects to a superheater within the generator via platen superheaters disposed within their respective combustion chambers. The vapor separator permits the partition to always be operated with a considerable surplus of water so that no stability problems occur. A water separator is also connected to an outlet of the enclosing walls and has a vapor outlet connected with the vapor outlet from the vapor separator. Various control circuits can be used to regulate the flow of vapor from the vapor separator to the superheater. A branch conduit for the feed water is also connected in parallel with the partition to permit mixing of some of the feed water with the water separated out of the vapor separator prior to passage into the enclosing walls of the generator.
摘要:
A once-through vapor generator in which the roof and heat recovery area rear wall comprise a single continuous downflow pass feeding the generator primary superheater. An outlet header for the pass, at the lower end of the pass, also serves as the inlet header for the primary superheater, flow from the header being upwardly in the superheater. A plurality of diaphragms at spaced intervals along the axis of this common header divide the header into a plurality of separate sections which in turn form in the downflow pass and superheater a plurality of narrow-width parallel down-up flow circuits. The invention prevents the occurrence of recirculation of flow at low loads within the roof and heat recovery area rear wall. A plurality of mix headers may be employed in each down-up flow circuit, at a midpoint in elevation in the heat recovery area rear wall. This reduces the possibility of recirculation within a particular down-up flow circuit in large sized units having a large difference in elevation between the roof inlet header and the lower common header.
摘要:
A vapor generator including an upright furnace section the boundary walls of which are formed by a plurality of tubes, a portion of which extend at an angle with respect to a horizontal plane. A plurality of divisional walls are provided which extend from an area externally of the boundary walls and which penetrate a boundary wall and terminate within the furnace section. The latter boundary wall is provided with a seal assembly extending over the area of penetration of the boundary wall. Fluid is passed sequentially through the tubes forming the boundary walls and the division walls to heat the fluid and convert it to vapor.