Abstract:
A safety grade protection system for monitoring parameters indicative of the status of a core of a nuclear reactor, and reducing the criticality of the nuclear reaction when the onset of unsafe conditions are detected. The invention directly detects, in real time, the power at a plurality of axial and radial locations within or about the core and provides a three-dimensional real-time core power output. The system processes those outputs together with a measure of core coolant inlet temperature, pressure and flow rate to calculate, in real time, the fuel centerline temperature, the heat transfer condition at the fuel elements' boundary and the rate of power change within the core.
Abstract:
A flexible, gas tight electrical coupling (32) for a gas cooled electrodynamic system such as an electrical generator includes a first connector element (38) that is in communication with a first combined coolant and electrical path (36) and has a first passage defined therein for a coolant, a second connector element (40) that is in communication with a second combined coolant and electrical path (34) and has a second passage defined therein for the coolant, a flexible tube (42) for communicating the first passage in the first connector element (38) with the second passage in the second connector element (40), and an electrical connection (54) for electrically connecting the first connector element (38) to the second connector element (40). According to one aspect of the invention, the electrical connection is external to the flexible tube, resulting in cost savings and other advantages when compared to an internal electrical connection. According to a second aspect of the invention, an outside of the flexible tube is sealed to the first and second connector elements to effectively guard against leakage of the coolant.
Abstract:
A mono-container fuel cell generator (10) contains a layer of interior insulation (14), a layer of exterior insulation (16) and a single housing (20) between the insulation layers, where fuel cells, containing electrodes and electrolyte, are surrounded by the interior insulation (14) in the interior (12) of the generator, and the generator is capable of operating at temperatures over about 650 DEG C, where the combination of interior and exterior insulation layers have the ability to control the temperature in the housing (20) below the degradation temperature of the housing material. The housing can also contain integral cooling ducts, and a plurality of these generators can be positioned next to each other to provide a power block array with interior cooling.
Abstract:
Simple and efficient methods and combustor systems for diverting a portion of main fuel to a pilot combustion air stream through a pilot premix nozzle is provided. This increase in premixed air-fuel to the pilot stage and simultaneous reduction in the amount of diffusion fuel flow to the pilot nozzle result in a reduction of nitrogen oxides emission.
Abstract:
A process is disclosed for repairing leaks in turbine generators that have water-cooled stator coils with hollow conductor strands, wherein the lead ends of the conductor strands are joined to a header (30). First a vacuum enclosure is provided around a portion of one of the stator coils in proximity to the header. Then a vacuum is applied to the portion. Finally, a resin (24) is injected into voids (40) in the portion. In a second embodiment, the header first is cut into an outboard section, and into an inboard section that remains attached to the conductor strands. Then the exposed lead ends of the conductor strands and the attached inboard section are cleaned to remove oxidation. Next, a water-tight braze seal (90) is applied over the lead ends of the conductor strands. Then the stator coil and the inboard section are joined to a new outboard section and a vacuum is subsequently applied to the inboard section. The resin (24) is then injected into voids (40) in the inboard section.
Abstract:
A preload system for preloading end winding coils of a stator includes a coil support platform coupled to a periphery of one of the coils, a clamping apparatus compressing the end winding coils and the coil support platform and a preload apparatus between the clamping apparatus and the coil support platform and not running circumferentially around the clamping apparatus.
Abstract:
An electrochemical fuel cell generator configuration (10) is made having a generator section (16) which contains a plurality of axially elongated fuel cells (26), each cell containing a fuel electrode (28), air electrode (30), and solid oxide electrolyte (32) between the electrodes, in which axially elongated dividers (58) separate portions of the fuel cells from each other, and where at least one divider (60) also reforms a reformable fuel gas mixture prior to electricity generation reactions, the at least one reformer-divider (62) is hollow (64) having a closed end (70) and an open end (68) entrance for a reformable fuel mixture to pass to the closed end of the divider and then reverse flow and pass back along the hollowed walls to be reformed, and then finally to pass as reformed fuel out of the open end of the divider to contact the fuel cells, and further where the reformer-divider is a composite structure having a gas diffusion barrier (76) of metallic foil surrounding the external walls of the reformer-divider except at the entrance to prevent diffusion of the reformable gas mixture through the divider, and further housed in an outer insulating jacket (78) except at the entrance to prevent short-circuiting of the fuel cells by the gas diffusion barrier.
Abstract:
A multi-swirl combustor plate (100) is disclosed. The multi-swirl combustor plate contains a plurality of swirlers (104) arranged around an interior section of the combustor plate, and a plurality of non-swirled holes (106) arranged around an exterior section of the plate (102) that had been cast as a solid section. The swirlers are preferably arranged in concentric circles, and the non-swirled holes are also preferably created in concentric circles disposed outside of the swirlers. In accordance with the present invention, each of the swirlers also preferably comprises an outer wall (210) having a thickness greater than that of the multi-swirl plate and is an extension of the multi-swirl plate disposed in the downstream direction. Similarly, the swirler hub (212) also has a thickness greater than that of the plate and is an extension disposed in the downstream direction. Methods of making a swirler plate are also disclosed that include the step of first casting a plate comprising a center section having a number of swirlers and a solid outer section. The solid outer section is then subsequently machined to create a plurality of non-swirled holes. Preferably, two concentric rings of swirlers are cast and/or concentric rings of non-swirled holes are created. The present invention thus permits the patterns of swirlers and non-swirled holes to be varied depending upon the demands of a particular turbine.
Abstract:
A laser welding apparatus (30) and method are used to weld the inner surface of small diameter tubes (15) such as nuclear heat exchanger tubes. A weld filler metal (74) carried by a rotatable laser weld head is fed into the weld zone to produce deeply penetrating weldments of low profile. The apparatus and method can effectively be used to repair cracks in heat exchanger tubes to thereby provide extended service life.
Abstract:
A flashback arrestor for a combustion turbine is disclosed. In accordance with the present invention, an area between the combustion zone of the turbine and fuel pre-mixing passages is provided with a structure comprised of a plurality of tubes. The flashback arrestor can thus be described as a "honeycomb" structure, and each individual tube or element of the honeycomb has a diameter that is less than the critical diameter below which flames will not propagate for a particular fuel-air mixture.