摘要:
The invention relates to a fossil-energy heated continuous steam generator, whereby the at least one combustion chamber, viewed in the flow direction of the hot gases, is divided into at least two throughflow segments, formed by evaporator heating surfaces, whereby the evaporator heating surfaces each comprise steam generation tubes welded to each other in a gastight manner and pressurized in parallel with a flow medium. According to the invention, said generator is suitable for operation with high fresh steam parameters, such as for example, steam temperatures of approximately 700° C., with a simple construction and particularly simple assembly, whereby a throughflow segment, arranged after the first through flow segment, viewed in the direction of flow of the hot gases, forms the first evaporator stage for the flow medium, such that the injection of particularly cold flow medium can occur in the region of maximum heating.
摘要:
The invention relates to a continuous steam generator provided, in a duct for hot gas circulating in a substantially horizontal direction, with a continuous heating surface of an evaporator comprising a plurality of steam generator tubes which are mounted in parallel for circulating a fluid flow. The inventive device requires exceptionally low construction expenditures and ensures a high degree of safety and a high efficiency. For this purpose, the continuous heating surface of the evaporator is characterized in that it comprises a segment of the heating surface through which a moving fluid flows in an opposite direction with respect to the heated gas direction is positioned in such a way that a saturated steam temperature which is adjusted during operation at the exit from the continuous heating surface deviates from the predetermined maximum value of the temperature of the gas prevailing during operation at the outlet of the segment of the heating surface. In addition, one or several entry collectors are disposed at a close distance from the outlet of the heating surface on the gas side in such a way that the moving fluid has a flow speed in the downpipe which is higher than the minimum speed required for pulling nascent steam bubbles.
摘要:
The invention relates to a steam generator comprising a heating gas channel, which can be traversed in an approximately horizontal heating gas direction and in which at least one continuous heating surface is located, configured from a number of approximately vertical evaporator tubes, connected in parallel to allow the passage of a flow medium. The aim of the invention is to provide a method for starting a generator, which guarantees a high degree of operational safety, even for a steam generator with a particularly simple construction. According to the invention, to achieve this, at least several evaporator tubes are partially filled to a predeterminable desired level with unevaporated flow medium, prior to the impingement of the heating gas channel by a heating gas.
摘要:
The aim of the invention is a device for coolant cooling in a gas turbine which, with a relatively simple construction and low plant complexity permits a particularly high degree of efficiency in using the heat produced on cooling the coolant from a gas turbine. Said aim is achieved, whereby a number of interconnected evaporator tubes for a flow medium, are arranged in a coolant channel, connected to a gas turbine, to form forced throughflow steam generator. Said device is preferably used in a gas and steam unit with a waste heat steam generator on the exhaust gas side of a gas turbine, the heating surfaces of which are connected into the water-steam circuit of a steam turbine. The evaporator tubes of the device are thus connected on the inlet side by means of supply line to the feed water train of the water-steam circuit of the steam turbine.
摘要:
A steam generator has a combustion chamber which is configured for an approximately horizontal main direction of flow of the fuel gas and which is followed on the fuel-gas side, via a horizontal gas flue, by a vertical gas flue. The containment walls of the combustion chamber are formed from evaporator tubes. Temperature differences between adjacent evaporator tubes of the combustion chamber are to be kept particularly low in all the load states of the steam generator. For this purpose, a first group and a second group of evaporator tubes can be acted upon in each case in parallel by a flow medium. The first group of evaporator tubes is connected in series with the second group.
摘要:
The fossil fuel fired continuous-flow steam generator has a gas turbine combustion chamber for fossil combustibles. On the heating gas side a vertical gas extractor is mounted downstream of a horizontal gas extractor. The walls surrounding the combustion chamber are composed of vertical evaporator tubes that are welded together. During operation the temperature differences between adjacent evaporator tubes of the combustion chamber are kept as low as possible. The burners are arranged at the level of the horizontal gas extractor. For a number of evaporator tubes which can be simultaneously impinged by the flow medium the ratio of the steam generating capacity M (in kg/s) at full load and of the sum A (in m2) of the inner cross-sectional surfaces of the same evaporator tubes is less than 1350 (in kg/sm2).
摘要:
The present invention directed to an at least substantially pore-free polyurethane prepared by reacting at least one polyisocyanate and a component containing a partial carboxylic acid ester which is the reaction product of a carboxylic acid and an at least trihydric alcohol in quantities such that at least one of the hydroxyl groups of said alcohol is not esterified.
摘要:
It is now possible to provide reaction resin mixtures based on organic polyisocyanates and organic polyepoxides that can be hot-cured to high-quality plastics having isocyanurate and oxazolidinone groups that are largely storage-stable at room temperature, without their curing having to be stopped at any time, so that the systems exist in an intermediate "B-stage" (i.e., in a state that is solid at ambient or moderately elevated temperature but still fusible), so that at any later time, for example after pulverizing or dissolving in a suitable solvent, they can be converted by shaping and further thermal action to their ultimate, crosslinked and no longer fusible final state.
摘要:
The invention relates to blends of polyarylene sulfides, epoxides, anhydrides, glass fibers and optionally other fillers. The blends are distinguished by good mechanical properties.
摘要:
The present invention relates to a reaction resin composition comprising a mixture of polyisocyanates, epoxides, and amine catalysts of the formula ##STR1## wherein A is independently alkylene, alkenylene, alkynylene, alkylidene, cycloalkylene, or aralkenylene; m is an integer of from 0 to 30; R.sup.1, R.sup.2 and R.sup.3 are independently optionally substituted aralkyl or polyaralkyl; and R.sup.4 is alkyl, alkenyl, alkynyl, cycloalkyl, or optionally substituted aralkyl or polyaryalkyl.
摘要翻译:本发明涉及一种反应树脂组合物,其包含下式的多异氰酸酯,环氧化物和胺催化剂的混合物,其中A独立地为亚烷基,亚烯基,亚炔基,亚烷基,亚环烷基或芳亚烯基; m为0〜30的整数; R 1,R 2和R 3独立地是任选取代的芳烷基或聚芳烷基; 且R 4为烷基,烯基,炔基,环烷基或任选取代的芳烷基或多芳基烷基。