Abstract:
A probe inspects steam generator tubing for defects. The probe includes a transducer which generates a localized ultrasonic Lamb wave. The ultrasonic wave is transferred to the tubing by a coupling medium, such as water, that physically couples the transducer and the tubing. Defects in the tubing reflect the ultrasonic wave to the probe which detects the reflections. The results are thenused to determine the length and depth of such defects as cracks, pitting, and thinning. The localized ultrasonic wave performs and inspection sensitive enough to detect ligaments between crack segments. This allows highly accurate predictions of tubing integrity and rupture strength.
Abstract:
A steam generating system (10) includes a nozzle for pulverized coal and air which includes an elongated generally cylindrical body (30) having a nozzle at one axial portion thereof. The apparatus also includes a nozzle tip (34) that is generally sleeve shaped and dimensioned to overlap an extremity of the body (30). The tip (34) is mounted for pivotal movement about the extremity of the body (30) and the nozzle tip (34) includes first and second surfaces (58, 59) dimensioned and configured for receiving therebetween all flow from the nozzle body (30). The apparatus also includes a seal plate (50) that is also generally sleeve shaped and dimensioned and configured to provide sealing between the extremity and the nozzle tip (34). The seal plate (50) is mounted for pivotal movement about the extremity of the body (30) and is dimensioned and configured to have third and fourth surfaces (52, 54) disposed respectively in closely spaced relationship to the first and second surfaces (58, 59) throughout all possible pivotal positions of the seal plate (50) and the nozzle tip (34). This closely spaced relationship defines an elongated slot for passage of air. The seal plate (50) includes a stop (56) to limit relative pivotal motion between the nozzle tip (34) and the seal plate (50). In some forms of the invention the first and second surfaces (58, 59) are planar surfaces. The third and fourth surfaces (52, 54) may be cylindrical sections. The stop (56) may include at least one upstanding member carried on the seal plate (50). The seal plate (50) may include first and second planar opposed sides joined by the third and fourth surfaces (52, 54). In some forms of the invention the third and fourth surfaces (52, 54) have concave parts and the concave parts are disposed in opposed relationship. The stop (56) may be a part of the first and second planar opposed sides and may include at least one ear on each of the first and second sides and in some cases also include a second ear on each of the first and second sides. All of the ears may be generally planar and each of the ears may be coplanar with one of the sides.
Abstract:
The apparatus includes a hot air chamber (46) for receiving hot air from an associated air preheater, and a recirculation gas chamber (60) for receiving recirculation gas from a recirculation fan (22). The apparatus also includes a duct (54) from the associated air preheater communicating with the hot air chamber (46) and a duct (62) from the associated recirculation fan (22) communicating with the recirculation gas chamber (60). A valve (66) is provided that is movable between a first position wherein flow through the duct (62) from the associated recirculation fan (22) is blocked and flow through a passageway (64) between the hot air chamber (46) and the recirculation gas chamber (60) is open to allow flow therebetween and a second position wherein flow through the duct (62) from the associated recirculation fan (22) is not blocked and flow through the passageway (64) between the hot air chamber (46) and the recirculation gas chamber (60) is closed to prevent flow therebetween.
Abstract:
A package boiler (10) of unitary construction embodying based on the particular pressure and temperature conditions required thereof a predetermined standard profile selected from a plurality of standard profiles collectively capable of providing within a range of design pressures up to 1050 psig and a range of design superheater outlet temperatures up to 750 degrees F steam production within a range of 20,000 to 180,000 pounds per hour, and embodying based on the nature of the fuel to be burned therewithin a front wall (14, 14') of predetermined construction selected from front walls (14) of rigidized ceramic fiber for use when the fuel being burned therewithin is light oil and natural gas, front walls (14) of heavy castable refractory for use when the fuel being burned therewithin is heavy oil and other special fuels, and front walls (14') that are fully water-cooled.
Abstract:
A coal fired power plant includes the catalytic reduction of NOx in the flue gas and the catalytic oxidation of SO2 to SO3 followed by the hydration of the SO3 to H2SO4 vapor and then the condensation to H2SO4 liquid. The condensation takes place in a wet sulfuric acid condenser (36) by heat exchange with incoming combustion air. A portion of the heat picked up by that combustion air is used to provide a portion of the heat for the condensate from the steam turbine (48). The combustion air is then fed to an air preheater (34) and to the steam generator (10) as primary and secondary combustion air.
Abstract translation:一个燃煤电厂包括催化还原烟气中的NOx和将SO2催化氧化成SO3,随后将SO 3水合成H 2 SO 4蒸气,然后与H 2 SO 4液体冷凝。 冷凝通过与进入的燃烧空气进行热交换在湿硫酸冷凝器(36)中进行。 由该燃烧空气拾取的一部分热量用于为来自蒸汽轮机(48)的冷凝物提供一部分热量。 然后将燃烧空气作为主燃烧空气和二次燃烧空气送入空气预热器(34)和蒸汽发生器(10)。
Abstract:
A fluidized bed system (10) which includes a housing (12) and a floor (14) comprising a plurality of generally parallel tubes (32) joined by fins (34) intermediate adjacent tubes (32). A plurality of nozzle assemblies (30, 50) extend generally vertically in mutually parallel relationship from the floor (14). Each of the nozzle assemblies (30, 50) includes a generally cylindrical body (36) having a centerline disposed in generally perpendicular relationship to the floor (14) and each of the bodies (36) includes a plurality of heads (38) extending generally radially therefrom at an axial extremity thereof remote from the floor (14). In some embodiments of the invention each of the heads (38) are uniformly spaced around the circumferential extent of each of the bodies (36) and each of the heads (38) is generally cylindrical and has a centerline. Each of the centerlines of the heads (38) may be disposed at an angle with respect to a horizontal plan and the angle may be approximately twenty degrees. In some forms of the invention some of the nozzle assemblies (30, 50) each have four heads (38) and some of the nozzle assemblies (30, 50) have two heads (38). In other embodiments all of the nozzle assemblies (30, 50) have two heads (38). In other embodiments all of the nozzle assemblies (30, 50) have four heads (38).
Abstract:
A method and apparatus for simultaneously inspecting the inner wall of two tubes, such as in a heat exchanger, including a base member which supports first and second guide tubes for guiding inspection probes of a testing system. The guide tubes are held by the base member a predetermined distance apart to align with a pair of tubes of the heat exchanger. The guide tubes may be fixed with respect to the base member by clamping collars and spacer bushings, or may be mounted for longitudinal movement with respect to the base member against the bias of a coil spring. A robotic tool delivery system is used to automatically move the dual guide tube assembly through a predetermined sequence to optimize testing positions where two testing probes may be used simultaneously.
Abstract:
A data acquisition system (1) by which environmental parameters proximate to plant installed valves (2) may be monitored, recorded and correlated with other valve operating data. The system includes sensors (8) for sensing environmental parameters such as gas/vapor concentration, temperature or humidity. The system also includes sensors for sensing changes in the actuating variable (34) and sensors for sensing valve stem displacement (58). The sensors (8, 34, 6) generate electrical signals proportional to the value of the sensed parameter. First data interface equipment (32, 42, 43) is provided for digitizing the sensed actuating variable as the actuating variable is changed to displace the stem, preferably a full stroke from the open-to-close-to-open positions or vice versa. Second data interface equipment (7, 45) is provided for digitizing the sensed environmental parameter as the stem is displaced. Third data interface equipment (6, 45) is provided for digitizing the sensed stem displacement. The digitized data are stored, preferably with a computer (45) and associated random access memory, and can later be uploaded for use in, for example, a plant database system or correlated to evaluate valve operability.
Abstract:
A non-intrusive method for timing the full operational motion of a valve plug (26) in an electrically actuated, pneumatically operated valve (10). An actuation signal is sent to the valve actuator (54). A coil of wire (68) around the valve actuator solenoid (56), an accelerometer (70) on the solenoid slug (64), or a connection to a permanent pressure sensor (72), non-intrusively senses arrival of the actuation signal at the valve. The time measuring equipment (12) begins timing when the actuation signal is sensed. A laser valve motion sensor (74) then non-intrusively senses when the valve plug reaches a limit of motion. The time measuring equipment ends timing when the valve plug reaches a limit of motion. The time measuring equipment then records the elapsed time from the sensing of the arrival of actuation signal to the final limit of motion of the valve plug.
Abstract:
A visual inspection tool (24), attached to a manipulator (20), is disclosed for inspecting a tube end (26) of a tube sheet of a steam generator (12). A fuse light (40) is mounted inside the housing adjacent to a light guide (46). An outer mirror (58) surrounds the light guide and has a cutaway portion (60) adjacent to the fuse light to allow light into the light guide. An inner mirror (64) is located at the top of the light guide and is supported on the housing axis. The outer and inner mirrors are designed such that light directed by the light guide to the top of the housing simultaneously reflects from the outer and inner mirrors onto the outer (120) and inner (118) portions of the tube end, respectively. A camera (78) receives the light reflected by the tube end and generates tube image data. At a remote location, a technician can see a panoramic view of the tube without repositioning the manipulator (20).