Abstract: A burner includes a generally cylindrical casing (1) and a burner head (2) mounted within the casing, the burner head including one or more vanes (9) rotatably mounted on the head and rotatable about the head to sweep through a region between the burner head (2) and the casing (1). The vanes (9) each include one or more gas outlets for introducing gas into an air flow through the region.

Abstract: A burner includes a generally cylindrical casing (1) and a burner head (2) mounted within the casing, the burner head including one or more vanes (9) rotatably mounted on the head and rotatable about the head to sweep through a region between the burner head (2) and the casing (1). The vanes (9) each include one or more gas outlets for introducing gas into an air flow through the region.

Abstract: A gas burner for use in a furnace and a method of burning gas in a furnace, especially but not exclusively a process furnace used in an oil cracking or refining process. The gas burner comprises two passageways with adjacent outlets. The first passage way is in fluid communication with a source of pressurized fuel gas and has an aperture through which recirculated flue gas can enter the first passageway and the second passageway is in fluid communication with a source of air. In operation, fuel gas is injected into the first passageway and recirculated flue gas is thereby drawn into the first passageway so that it mixes with the fuel gas. Fuel gas is partially combusted and a mixture of partially combusted fuel gas and recirculated flue gas flows up the first passageway and comes into contact with air from the second passageway and combusts.

Abstract: A flare stack comprises an upwardly extending gas discharge duct 10 and a pilot burner 16 operative at an burner location near the open top end of the duct 10 to ignite gas discharged by way of the duct. Atmospheric samples from the burner location are delivered to a monitoring station 20 remote from the duct 10 and at ground level 12. A sensor at the monitoring station 20 is responsive to a parameter of the sample indicative of combustion at the burner location such as increased CO2 or NOx or decreased O2. An igniter is operatively associated with the sensor and arranged to light the pilot burner 16 automatically if the sensor does not detect said parameter in the sample.

Abstract: A gas burner for use in a furnace and a method of burning gas in a furnace, especially but not exclusively a process furnace used in an oil cracking or refining process. The gas burner comprises two passageways with adjacent outlets. The first passage way is in fluid communication with a source of pressurised fuel gas and has an aperture through which recirculated flue gas can enter the first passageway and the second passageway is in fluid communication with a source of air. In operation, fuel gas is injected into the first passageway and recirculated flue gas is thereby drawn into the first passageway so that it mixes with the fuel gas. Fuel gas is partially combusted and a mixture of partially combusted fuel gas and recirculated flue gas flows up the first passageway and comes into contact with air from the second passageway and combusts.

Abstract: An incinerator 20 for disposing of boil-off gas on an LNG carrier comprises a combustion chamber 42 wherein the boil-off gas admitted at 40 is burned in the presence of combustion air admitted at 44, producing a flame 46 and combustion products C. Dilution air A is delivered into the combustion chamber 42 and mixed with the combustion products C to produce a diluted mixture M. The combustion chamber 42 has an inner wall 48 and an outer wall 50 together defining a first passage 52 through which the dilution air A is passed before being mixed with the combustion products C, whereby the dilution air A cools the incinerator 20. The dilution air A in the first passage 52 also provides a thermally insulting layer limiting radial heat transmission from the combustion chamber 42. A flue 58 is configured and arranged so that the flame 46 is enclosed.

Abstract: An apparatus for heating a multicomponent working fluid includes a circulating fluidized bed configured to combust a collection of solid particles producing flue gases carrying particulate matter. Heat from the flue gases is transferred to a multicomponent working fluid contained within a plurality of first fluid tubes forming an enclosure for containing and directing a flow of the flue gases. The enclosure may also contain additional tubes forming a superheater. A separator receives the flue gases from the enclosure and separates the particulate matter therefrom expelling a first portion of the flue gases substantially without the separated particulate matter and a second portion of the flue gases containing the particulate matter. A heat exchanger receives the second portion of the flue gases provided as an output from the separator. An adjustable flow controller regulates the flow from the separator of the second portion of the flue gases to the heat exchanger and to the enclosure.

Abstract: Compliance with administrative limits on cumulative exposure of control rod groups in the reactor core, is monitored by computing the incremental effective exposure for each group commensurate with core power, for each time increment at which each group is within the position range where an administrative limit is imposed. The increments of effective exposures for each group are accumulated, and the accumulated effective exposure for each group is compared with the administrative limit to each group. This comparison is then displayed to the reactor operator, preferably using either a “rolling wheel” or “sliding bar” format.

Abstract: A technique for cooling furnace walls in a multi-component working fluid power generation system is disclosed. In a first embodiment, the technique involves removing process heat from a furnace having an inner tubular wall and an outer tubular wall. In a second embodiment, the technique involves removing process heat from a furnace system utilizing a fluid combiner. In a third embodiment, the technique involves removing process heat from a furnace having tubular walls formed of a plurality of fluid tubes.

Abstract: A system for changing the temperature of a working fluid, including amonia, includes a working fluid source and a steel tube. The working fluid source is configured to direct a flow of the working fluid. The working fluid from the source is at a temperature. The steel tube has a treated inner surface layer defining a flow passage. The surface may comprise a mill finish surface, an oxidizing surface and/or a chromized surface. The tube is configured to receive the working fluid from the source and to direct the flow of the received working fluid along a path to change the temperature of the received working fluid.

Abstract: A system (10) and method (42,44,46,48,52,54) for generating an index (38,132,40,134) commensurate with the degree to which a tube array degrades over a period of time due to corrosion in a particular operating environment. A data array (62,114) is created defining the number of tubes in the tube array, a plurality of time points defining time intervals during which the degradation is to be assessed, and operating conditions that induce corrosion during each time interval. The expected degradation value of the array is computed over each of a plurality of time points using a deterministic failure model (88) having at least one parameter (102,104,106) that is assumed constant at each time point. For each time point and at least one parameter, a plurality of values of the parameter (108,110) that deviate from the assumed constant value, are generated.

Abstract: A combined cycle system has a gas turbine for generating an exhaust gas stream and a heat recovery steam generator with a housing for defining a horizontal exhaust gas flow path for the exhaust gas stream. Positioned within the housing is a heat recovery assembly having vertical rows of horizontally oriented heat transfer tubes transverse to the direction of gas flow and spaced apart in the direction of the gas flow path. The heat transfer tubes are supported by a plurality of vertical support plate assemblies oriented parallel to the exhaust flow path. Each support plate assembly has a plurality of coplanar support plate segments, each support plate segment supporting less than three rows of heat transfer tubes.

Abstract: A top mount canopy seal mechanical clamp assembly 20 for repair of a leaking canopy seal weld 16 between a nuclear reactor head penetration nozzle 12 and a mating part 14 has an annular housing 24 with insert support halves 28 and 30 for surrounding the nozzle. A top plate 34 is urged toward the support halves and housing by Belleville washers mounted on cap screws 42 threaded in bores 44 of the housing. A flexible graphite seal annulus 22 is compressed by the clamping action against the canopy seal weld 16 to create a flexible graphite leak stopping seal at the weld.

Abstract: A deposit removal high pressure spray apparatus for removing heat conduction inhibiting deposits on U-tubes at the top of a shell and tube type of nuclear steam generator (10) tube bundle (16) by crawling along flanged outboard support beams (18) above the U-tubes bundle. The apparatus includes: a crawler (66) with motive means 68 for "inch worm" movement; a rotationally driven base 62 provides movement of the sprayhead to either side of the outboard support beam; a rotationally driven extension arm 60 on rotating base 62 has an elongated reciprocally driven elevator 58 thereon; and, a wrist 52 reversibly and rotatably driven by motor 54a sweeps sprayhead 52 with nozzles 56 to clean the top of the bundle 16 tube lanes of 90.degree., 45.degree. and 135.degree. efficiently.