FOSTER WHEELER NORTH AMERICA CORP. Patent applications |
Patent application number | Title | Published |
20130014747 | Solar Heat Receiver SystemAANM Seltzer; RobertAACI HillboroughAAST NJAACO USAAGP Seltzer; Robert Hillborough NJ US - A solar heat receiver system includes multiple vertically extending solar heat receiving tubes for transferring solar heat to a heat transfer medium flowing through the solar heat receiving tubes, a rigid support structure, two first connectors to connect two spaced-apart portions of the solar heat receiving tubes to the rigid support structure so as to prevent horizontal movement of the two spaced-apart portions of the solar heat receiving tubes, and a second connector for connecting at least one intermediate portion of the solar heat receiving tubes to the rigid support structure, which intermediate portion is located between the spaced-apart portions. The second connector allows a limited amount of horizontal movement of the at least one intermediate portion of the solar heat receiving tubes due to a thermally induced bow of the solar heat receiving tubes. | 01-17-2013 |
20130008394 | Radiant Superheater - A radiant superheater arranged to hang at the upper portion of a furnace of a boiler. The radiant superheater is substantially planar and includes a first vertical pass, a first connection pass, a second vertical pass, a third vertical pass, a second connection pass, and a fourth vertical pass. Each vertical pass includes an upper end and a lower end. The vertical passes are connected in series, so that steam to be superheated enters at the upper end of the first vertical pass and flows through the first vertical pass and from the lower end of the first vertical pass via the first connection pass to the lower end of the second vertical pass and through the second vertical pass and from the upper end of the second vertical pass to the upper end of the third vertical pass and through the third vertical pass and from the lower end of the third vertical pass via the second connection pass to the lower end of the fourth vertical pass and through the fourth vertical pass, to be discharged from the upper end of the fourth vertical pass. The first connection pass is arranged below the second connection pass so as to shield the second connection pass from radiation from the lower portion of the furnace. | 01-10-2013 |
20120222591 | Method of and Apparatus for Selective Catalytic NOx Reduction in a Power Boiler - A method of selective catalytic NO | 09-06-2012 |
20120214017 | Weld Overlay Structure and a Method of Providing a Weld Overlay Structure - A method of providing a weld overlay structure on a heat transfer tube or a membrane surface. A first continuous bead portion of an overlay material is applied onto the heat transfer tube or membrane surface by using a weld head to melt the overlay material. A second continuous bead portion of the overlay material is applied onto the heat transfer tube or membrane surface by using a weld head to melt the overlay material, in which the second bead portion partially overlaps with the first bead portion, forming a groove between the first bead portion and the second bead portion. A third continuous bead portion of an overlay material is applied onto the heat transfer tube or membrane surface by using a weld head to melt the overlay material into the groove between the first bead portion and the second bead portion, so as to form a relatively smooth surface. | 08-23-2012 |
20120189522 | Method of Desulfurizing Flue Gas, an Arrangement for Desulfurizing Flue Gas, and a Method of Modernizing a Desulfurization Arrangement - A method of desulfurizing flue gas in connection with oxy-combustion. A sulfur containing gas flow is introduced to a flue gas desulfurization arrangement having a spray tower at its top part and a reaction tank at its bottom part, in which the reaction tank contains liquid slurry having a surface level L. Sorbent-containing liquid slurry is sprayed to the sulfur containing gas flow. Sulfur-containing molecules are allowed to be absorbed into liquid slurry droplets. The liquid slurry droplets are allowed to enter the liquid slurry in the reaction tank. Oxygen containing gas is bubbled in the liquid slurry from a gas inlet header and nozzles in the reaction tank, in which the nozzles are arranged at a certain level in the reaction tank. Sulfur-containing particulates settle in the reaction tank. The sulfur-containing particulates are removed as a slurry from the reaction tank, and the bubbled gas that has left the liquid slurry is discharged separately from the flue gas from the flue gas desulfurization arrangement. | 07-26-2012 |
20120160142 | Method of and Apparatus for Selective Catalytic NOx Reduction in a Power Boiler - A method of selective catalytic NO | 06-28-2012 |
20120129112 | Method Of And A System For Combusting Fuel In An Oxyfuel Combustion Boiler - A method of and a system for combusting fuel in an oxyfuel combustion boiler. Fuel is fed to a furnace of the boiler. Oxidant gas that includes a mixture of substantially pure oxygen and recycled flue gas is fed to the furnace, prior to the feeding of the oxidant gas. At least a portion of the oxidant gas is preheated to generate preheated oxidant gas. The fuel is combusted with the oxidant gas in the furnace so as to generate steam and to produce the flue gas, and at least a portion of the steam is superheated to generate superheated steam. The preheating of the at least a portion of the oxidant gas is performed by using a heat exchanger that transfers heat from a portion of the superheated steam to the oxidant gas. | 05-24-2012 |
20110294077 | Method of Controlling a Boiler Plant During Switchover From Air-Combustion to Oxygen-Combustion - A method of controlling a boiler plant during a switchover period from an air-combustion mode to an oxygen-combustion mode. The method includes steps of feeding fuel into a furnace of the boiler plant at a rate determined by a fuel feeding scheme, feeding air into the furnace at a rate determined by a descending air feeding scheme, feeding substantially pure oxygen into the furnace at a rate determined by an ascending oxygen feeding scheme, and recirculating flue gas into the furnace at a rate determined by an ascending flue gas recirculating scheme. The fuel feeding scheme, the air feeding scheme and the oxygen feeding scheme are such that the fuel is combusted and the flue gas containing residual oxygen is produced. Also, the fuel feeding scheme, the air feeding scheme and the oxygen feeding scheme are such that the content of residual oxygen in the flue gas is, during at least a portion of the switchover period, greater than during any of the air-combustion mode and the oxygen-combustion mode. The method makes it possible to reduce CO | 12-01-2011 |
20110265697 | Circulating Fluidized Bed Combustor and a Method of Operating a Circulating Fluidized Bed Combustor - A circulating fluidized bed combustor arrangement includes (a) a circulating fluidized bed reactor in which (i) a combustion chamber combusts a fuel material in a suspension of solid particles of a circulating fluidized bed, (ii) a first cyclone separator arrangement receives a mixture of gases and solid particles from the combustion chamber for separating a first fraction of the solid particles from the exhaust gases, and (iii) a solid particle return system connected to the first cyclone separator returns separated solid particles to the combustion chamber, (b) a heat transfer section including a water/steam heat exchanger section arranged after the first cyclone separator arrangement in the exhaust gas flow path, (c) a heat recovery device provided in connection with the combustion chamber, the first cyclone separator arrangement and the heat transfer section being arranged for recovering heat resulting from the combustion process in the combustion chamber, (d) a selective catalytic reduction system arranged in the exhaust gas flow path, after the heat transfer section, for removing NOx from the exhaust gas, (e) a device for injecting NOx reducing agent into the exhaust gases upstream of the selective catalytic reduction system, and (f) a second cyclone separator arrangement provided downstream of the first cyclone separator arrangement and upstream of the heat transfer section, in which a second fraction of the solid particles is separated form the exhaust gases. | 11-03-2011 |
20110226195 | Wall Construction for a Boiler Arrangement - A wall construction for a boiler arrangement. The boiler arrangement is formed of at least a furnace and a separator. The furnace has a grid, a bottom part, and an upper part. The separator is arranged by conduits in flow communication with both the upper part and the bottom part of the furnace. The conduits, together with the separator, form an external circulation of bed material. The upper part of the furnace has four vertical walls, and the bottom part of the furnace has a height and four walls extending from the grid up to the vertical walls. The wall construction includes at least one hollow beam being attached to a wall of the bottom part of the furnace and extending substantially over the entire height of the bottom part, and the at least one hollow beam being in flow communication with the external circulation for returning bed material into the furnace. | 09-22-2011 |