Abstract: A heat recovery steam generator includes an exhaust-gas channel with an economizer heating surface and evaporator heating surface. The heating surfaces are connected to one another such that, on a feed water side, the economizer heating surface is upstream of the evaporator heating surface. A water/steam separator is arranged on the feed water side downstream of the evaporator heating surface. An excess pipe length system is outside the exhaust-gas channel and is designed in such a way that, after a complete filling of the economizer heating surface, feed water, in a riser of the excess pipe length system, reaches an overflow and thus passes into the evaporator heating surface via a down pipe. A vent line branches off the overflow of the excess pipe length system. A first filling line and a first valve are arranged between an economizer filling outlet and the evaporator outlet of the evaporator heating surface.

Abstract: An exhaust duct for a fossil fuel powered engine includes an exhaust gas passage, a cooling fluid passage, a mixing device for mixing cooling fluid with the hot exhaust gas and a selective catalytic reduction catalyst for removing nitrogen oxides arranged in the exhaust gas passage. The mixing device has a mixing chamber with a first wall and an opposed second wall, the first and second wall arranged upstream of the selective catalytic reduction catalyst in the exhaust gas passage and extending over the cross-sectional area of the exhaust gas passage, both walls perforated by through holes, wherein through holes of the first wall are connected with through holes of the second wall in pairs by pipes extending through the mixing chamber, the pipes perforated by at least one hole into the mixing chamber and the cooling fluid passage ending into the mixing chamber.

Abstract: A steam supply apparatus (1) for enhanced oil recovery from an oil field (10). The steam supply apparatus includes a water circulating portion (50) providing a continuous flow of water to a water heater (4) for the production of a mixture of steam and water, and a separator (5) for directing the steam to the oil field. Water returned from the oil field is purified in a water treatment apparatus (3) to provide make-up water to the water circulating portion. A buffer volume (3b) is provided in fluid communication between the water treatment apparatus and the water circulating portion. The buffer is sized to provide a time lag between a degradation of the quality of the purified water and an occurrence of an unacceptable scale production in the water heater, thereby allowing continued safe system operation until the water quality problem is corrected.

Abstract: A hybrid solar power plant includes a first circuit including a first flow medium and a second circuit including a second flow medium. The first circuit includes at least one solar collector to transfer collected solar heat to the first flow medium. The first circuit includes at least one first fluid/second fluid heat exchanger to exchange heat from the first flow medium in the first circuit to the second flow medium in the second circuit. The second circuit is preferably a water/steam circuit. The second circuit includes at least one steam turbine for generating electricity out of steam. The first circuit further includes a heat source for generating a flow of heating gas. The heat source serves as the auxiliary energy. A gas/first fluid heat exchanger is provided for transferring heat from the flow of heating gas to the first flow medium in the first circuit.

Abstract: A steam generator includes a substantially horizontal gas conduit (1) to guide a heating gas flow (2) and an evaporator unit positioned at least partially in the horizontal gas conduit for transferring heat from the heating gas to a flow medium which flows through the evaporator unit. The heat transfer section of the evaporator unit of the steam generator is bottom fed, which means that the inlet conduit is arranged at a lower region of the heat transfer section. The outlet conduit is arranged at an upper region. The inlet conduit allows an once through operation of the evaporator section which is necessary to enable operation under supercritical circumstances. The evaporator unit includes at least two evaporator stages (3, 4) which are arranged in a cascade. Each evaporator stage includes a heat transfer section (12, 21) and a separator (14, 23). The presence of the separators (14, 23) subdivides the evaporator unit into evaporator stages (3, 4).