摘要:
The invention relates to an (O) RC-method for utilising the waste heat from biomass combustion for generating electricity as well as to a corresponding system, according to the preamble of patent claims 1 and 6. In order to achieve an improvement of the overall energy efficiency such that the overall efficiency of the biomass utilisation is enhanced, it is proposed, according to the invention, to design the evaporator so as to correspond exactly to the targeted difference in enthalpy on the boiling curve pre and post evaporation, by means of connecting to this end a controllable heat exchanger upstream of the evaporator, which heat exchanger is regulated to the difference in enthalpy between the pump and the entrance into the boiling curve of the evaporator.
摘要:
A feedwater heater for a steam generator (A) or heat recovery boiler or waste heat boiler through which hot gases pass includes two sections (26, 28) which are located side by side so that the temperature of the hot gases at the upstream face (30) of each section is essentially the same. The feedwater flows through a heat exchanger (34) before entering the first section, and here it is heated by water flowing from the upstream face of the first section to the downstream face (32) of the second section. The arrangement is such that all tubes in the two sections remain above the dew point of the hot gases, so that water does not condense on the tubes and unite with oxides of sulfur to form sulfuric acid which will corrode the tubes, yet substantial temperature differentials exist between the water in the sections and the hot gases as the gases pass through the sections.
摘要:
In a duct leading to a chimney (10) which discharges exhaust gas to the atmosphere, an exhaust gas residual heat recovery device (1) is provided with a dry economizer (2) which uses the sensible heat of exhaust gas to heat water-to-be-heated; and a condensation economizer (4) which is provided on the downstream side of the dry economizer (2), and uses the condensation latent heat of exhaust gas to heat the water-to-be-heated. The duct comprises a first stage duct (6) wherein the dry economizer (2) is provided, and a latter stage duct (8) which is connected to the first stage duct (6), and changes exhaust gas flow into rising flow. The condensation economizer (4) is installed in the latter stage duct (8). The configuration of the duct is such that the exhaust gas reaches the condensation temperature in the vicinity of an upper section (5) of the condensation economizer (4).
摘要:
Dampferzeuger, vorzugsweise Abhitzedampferzeuger einer kombinierten Gas-Dampf-Kraftwerksanlage mit einem Gasturbinenkreislauf und einem Dampfturbinenkreislauf, bei welcher Anlage die Abgase einer Gasturbine (4) ihre Restwärme über das im Dampferzeuger (7) strömende Arbeitsmittel, welches über eine Speisepumpe (14, 20) gefördert wird, an eine Dampfturbine (9, 10) abgeben, und wobei der Dampferzeuger (7) mindestens einen Economiser (15, 21) und einen Verdampfer (16, 22) aufweist. Zur Verhinderung der Dampfbildung im Economiser (15, 21) wird der Druck im Economiser oberhalb des Sättigungsdruckes erhöht. Der Druck im Economiser (21) kann mittels eines wasserseitig vor dem Verdampfer angeordneten Speisewasserregelventils (53) und einer drehzahlgeregelten Speisepumpe (20) eingestellt.werden. Er kann auch aufgelastet werden durch Absperren der wasserseitigen Zuströmleitung (49) und durch Einleiten des Speisewassers in den Economiser über dessen Austrittssammler (15b).
摘要:
The preheating system (100) for preheating fluid medium to be fed into the HRSG (200) includes a feed line (110) and a recirculation line (120). The feed line (110) is adapted to feed the fluid medium to a Low Pressure Economizer LPE (210) of the HRSG (200). The feed line (110) is adapted to be adjoined to an inlet (210a) of the LPE (210), and an outlet (210b) of the LPE (210) enables therefrom the flow of the fluid medium in further portion of the HRSG (200). The recirculation line (120) is adapted to be connected between the outlet (210a) and the inlet (210b) of the LPE (210), in parallel to LPE (210) to recirculate the fluid medium to the LPE (210).