Abstract: A method of combustion and a combustion plant in which absorbent is regenerated is described herein. During the combustion of a fuel in a combustion chamber enclosing a fluidized bed, a fuel and an absorbent are supplied to the fluidized bed. The combustion gases generated during the combustion are collected and purified in a separating member by separation of solid material from the combustion gases. The separated solid material is recirculated to the fluidized bed through a channel, and a gaseous medium is supplied in a controlled manner to the separated solid material present in the channel in order to displace the combustion gases and provide a chemical reaction.

Abstract: A method of combustion in a pressurized, fluidized bed and in the freeboard thereof. The combustion method is further characterized by the recirculation of solid sulfur absorbing materials. A gas channel, designed so as to prevent fluidizing gas from entering the channel from below, is provided such that it opens to the freeboard and to a separating member which separates particulate matter from the combustion gasses.

Abstract: A method of combusting a fuel, and a combustion plant are proposed. The combustion plant comprises a first circuit (1) with a gasifying reactor (3) to produce a combustible gas and a degassed, combustible rest product from the fuel. The combustible gas is supplied to a first combustion chamber (6) and there it is combusted while forming combustion gases. First means (8, 9) are arranged to take advantage of the energy in these gases. The plant further comprises a second circuit (2) with a second combustion chamber (15) which is supplied with the combustible rest product from the gasifying reactor (3). The rest product is combusted in the second combustion chamber (15) while forming combustion gases. The second circuit (2) further comprises second means (23, 24) for taking advantage of the energy of the combustion gases produced in the second circuit (2).

Abstract: A power plant is disclosed having a combustion chamber (1) in which the combustion of a combustible material is performed, while forming hot combustion gases to drive a gas turbine device (14, 20, 27). A topping combustion device (8, 23) is arranged to receive the combustion gas and raise its temperature to a level suitable for the gas turbine device. A gasifying reactor (1) is arranged to produce a combustible gas for combustion in the topping combustion device (8, 23). A first conduit member (18) is arranged to supply an oxygen-containing gas, necessary for gasification, to the gasifying reactor (10) and a second conduit member (9) is arranged to supply the combustible gas from the gasifying reactor (10) to the topping combustion device (8, 23). A member (35) is arranged at the second conduit member (9) and adapted to cool down the combustible gas supplied to the topping combustion device (8, 23).

Abstract: A shaft device for a valve, comprises a shaft supported in a bearing and extending into a relatively warm space, a sleeve provided between the shaft and the bearing, and cooling channels arranged in the border area between the shaft and the sleeve for cooling of the bearing, and wherein the axial length of the sleeve is longer than the axial length of the bearing.

Abstract: To a fluidized combustor bed there is passed particulate fuel via a fuel flow distributor which comprises a vessel for receiving a particular fuel from a fuel storage. The fuel is fed into the vessel of the fuel flow distributor from the fuel storage, whereupon the fuel is fluidized in a bed above a bed bottom in the vessel of the fuel flow distributor. The fuel flow distributor comprises at least two feed pipes with associated inlets located adjacent the surface of the bed in the fuel flow distributor, where fluidization gas which leaves the vessel via a feed pipe feeds out fuel to at least one nozzle is in the bed of the combustor. Additional gas is supplied to the feel pipes at the inlets thereof, such that the flow of fuel through an individual feel pipe can be controlled by controlling the gas flow supplied to the inlets of the respective feed pipes.

Abstract: In a power plant with combustion of particulate fuel in a fluidized bed, unburnt particles are after-burnt in a burner which is based on the principle of vortex collapse and coarser particles are separated in connection with the after-burning. Such a burner may be designed as a double-cone burner, wherein unburnt fuel particles are burnt. Larger particles move around in a helical movement inside the extension of the burner cone. A coarse particles separator integrated with the burner, is arranged and comprises a circular gap which is located near the extension of the burner cone and which collects coarser particles rotating at the side of the combustion zone of the burner. These separated particles, collected by the circular gap, are forwarded to a space which surrounds the burner and from where the separated coarser particles are returned to the primary combustion space, for example, to the fluidized bed in the plant.

Abstract: A method of discharging particulate material from a first container to a lower positioned storage area being under a lower pressure than the first container. Particulate material is discharged via an upper tube section of a discharge tube communicating with the first container and permanently containing a column of the particulate material. The discharged material is directed into a pressurized stabilizer. The discharged material is directed via a lower tube section to a material feeder for forming columns of the particulate material in the upper and lower tube sections thereby reducing the pressure of the material to a predetermined normal pressure level at the input of the feeder. The material is fed to the storage area. The quantity of discharged material is controlled by the feeder.

Abstract: A method of adjusting capacity of air flow to a pressurized combustor in a gas turbine plant having a first compressor driven by a gas turbine, which is in turn driven by gases generated during combustion of a fuel in the combustor is disclosed comprising providing a second compressor located downstream of the first compressor, connecting the second compressor downstream of the first compressor, supplying air to the combustor, in addition to that provided by the first compressor, from the second compressor into an air path downstream of the first compressor, the additional air from the second compressor compensating for an insufficient air flow from the first compressor to achieve optimal air flow at full load operation of the gas turbine plant.

Abstract: A method for maintaining a nominal working temperature of flue gases during operation of a PFBC power plant having a pressure vessel with a combustor enclosed therein for combustion of a fuel in a fluidized bed, a gas turbine for receiving flue gases formed during the combustion in the combustor, a compressor driven by the gas turbine for compression of air which is utilized as combustion air during the combustion in the combustor, and a steam turbine driven by steam generated in tube bundles in the bed, includes the steps of burning a complementary fuel in the flue gases generated during the combustion in the fluidized bed downstream of the tube bundle for increasing the flue gas temperature to a nominal level for the process and using oxygen residues in the flue gas as oxidizing agents during combustion of the complementary fuel.

Abstract: An inner liner for a tubular casing, with the casing having a support means for coaxially supporting the liner within the casing. The liner has an axis and is made of material having a different coefficient of linear expansion than the casing, and comprises at least one tubular section having an outer surface which defines at least one conical support section for resting against the support means at contact points with the support means. The contact points are located on generatrices of a conceived cone or pyramid, with the generatrices radiating from a fixed point on the axis of the liner coinciding with the tip of the cone or pyramid.

Abstract: A method of feeding out dust in a dust discharge system in a power plant including feeding out dust pneumatically from a separator via a suction nozzle by using transport gas with a pressure exceeding atmospheric pressure, supplying diluting gas into the transport gas at a location close to the suction nozzle of the dust discharge system, and selecting the flow of diluting gas into the transport gas so that part of the pressure drop (.DELTA.Pgas) of the transport gas across the dust discharge system (.DELTA.p) is maintained.

Abstract: The nozzle contains a conduit for supply of paste fuel. A tapering end of the conduit is located towards an outlet for the nozzle. A spout for supplying splitting air is directed towards the outlet for the nozzle. The jet of splitting air is imparted by the spout in the shape of a cone which has an outer edge tangent to an inner edge of the outlet for the nozzle.

Abstract: A method and a device are provided for cutting off a gas flow through a filter element in a ceramic filter of high-temperature type upon breakage of the filter element, wherein a pulling member which is fixed to the lowermost part of the filter element causes a valve to be closed upon breakage of the filter element, whereby the outlet of the filter element for normally cleaned gases is closed.

Abstract: A method of heating of bed material in a PFBC plant including a combustor and wherein bed level adjustment due to a load change is accomplished by injecting bed material into or discharging it from the combustor through feeding devices, the method including the steps of arranging two storage vessels, each adapted for injecting the bed material therefrom into the combustor and for storing bed material discharged from the combustor, and heating and maintaining the bed material in the storage vessels at the temperature corresponding to the bed temperature while maintaining the bed level of the combustor constant, by discharging bed material with the temperature of the bed from the combustor via the feeding device adapted for discharge of bed material, into one of the storage vessels with a predetermined feed speed and at the same time and at the same feed speed injecting bed material from the second storage vessel into the combustor via the feeding device adapted for injection of bed material.

Abstract: A method for use during starting and/or low-load operation of a once-through boiler. The method includes the steps of generating steam in a steam generator; separating water from the steam in a moisture separator; heating the steam in a superheater and feeding the steam to a high-pressure turbine; returning expanded steam from the high-pressure turbine to a reheater for heating before supplying the steam to an intermediate-pressure turbine; supplying the separated water from the moisture separator to a reheater flashbox; and feeding stream separated in the reheater flashbox to the reheater.

Abstract: Air flow is controlled in a PFBC plant comprising a combustor and a pressure vessel, a two-shaft gas turbine consisting of a low-pressure compressor LC and a low-pressure turbine LT interconnected by a shaft and a high-pressure compressor HC and a high-pressure turbine interconnected by a shaft. Air is sucked into LC, is passed on to HC and via an intercept valve into the pressure vessel and the combustor, whereafter the return flow is passed via the intercept valve to HT and further to LT, from where the return flow is released into the free environment. To control the air flow the set value (G.sub.set) of the air flow control is calculated on the basis of the of the bed level and the actual value (G.sub.

Abstract: A method for temperature control of an air supply in PFBC plants which comprise a low-pressure unit including a low-pressure compressor and a low-pressure turbine, a high-pressure unit including a high-pressure compressor and a high-pressure turbine, wherein air is sucked into the low-pressure compressor whereupon the air is passed via an intermediate cooler, which is traversed by water, into the high-pressure compressor and then into a boiler of the plant. The method includes measuring in a temperature control system a temperature of the air both upstream and downstream of the high-pressure compressor, comparing the two measured temperature values and corresponding set values for the respective upstream and downstream temperature, and activating, based only on one of the comparisons, a shunt valve of an intermediate cooler. The control signal of the shunt valve consists of the output signal from the temperature control system.