Abstract:
A gas outlet monitoring system for a boiler system includes a gas probe(s) with a plurality of gas sensing locations wherein each location measures a plurality of parameters of the gas flow, such a oxygen concentration and temperature. The multi-sensor probe (10) includes a tubular lance (14) and a plurality of sensor pods (14) spaced along the lance. Each sensor pod has an oxygen sensor disposed in a first port, and a first temperature sensor disposed in a second port. An enclosure (20) is disposed at one end of the tubular lance. The enclosure (20) has a respective pressure sensor for each oxygen sensor port. A plurality of first tubes passes through the lance between the enclosure and the first port of a respective sensor pod to provide a gas to the respective first port for the purpose of providing cleaning air. A plurality of second tubes passes through the lance between the enclosure and the first port of a respective sensor pod to provide fluid communication between gas in the respective first port and the respective pressure sensor. One pressure sensor is provided for each oxygen sensor.
Abstract:
A method of measuring temperature and velocity of a fluid flow passing through a device (5, 7, 11) of a plant (1) includes the step of positioning at least two sensors (13) in the device. For each sensor (13), a traveling path (18a, 18b) for an acoustic signal (17) received from another sensor (13) is determined. Each sensor (13) emits an acoustic signal (17) at a frequency that differs from a frequency of an acoustic signal (17) to be emitted by the other sensor(s) (13) in the fluid flow. A velocity profile and temperature profile for the fluid flow based on the acoustic signals (17) received by the sensors is determined. A measurement system can include sensors (13) and a computer device (15) that can determine a velocity profile and temperature profile for a fluid flow passing through a device (5, 7, 11) based on the acoustic signals (17) received by the sensors (13). A plant (1) can be configured to implement the method or include an embodiment of the measurement system.
Abstract:
The invention relates to a high power electrical module (10) comprising at least a first and a second electrical sub-module (111, 112), at least a first bus bar (131) that electrically connects together the first and the second electrical sub-module (111, 112), and at least a first and a second heat sink (120, 125) on which are respectively mounted the first and the second electrical sub-module (111, 112). The first and the second heat sink (120, 125) are arranged independently movable from each other in such manner to compensate the expansion of the first bus bar (131). The invention also relates on a voltage-source converter.
Abstract:
The present invention includes systems and methods for providing cooling channels located within walls of a turbine airfoil. These cooling channels include micro-circuits that taper in various directions along the length and width of the airfoil. In addition, these cooling channels have a variety of shapes and areas to facilitate convective heat transfer between the surrounding air and the airfoil.
Abstract:
The present invention discloses a novel apparatus and way for sealing a portion of a gas turbine combustor in order to regulate the flow of compressed air into an annular passage adjacent to a combustion liner. A compressible seal is utilized having a first annular portion, a second annular portion, and a transition portion, the compressible seal regulates airflow passing through the compressible seal via a plurality of openings and/or axially extending slots.
Abstract:
A voltage source converter (10; 80; 90), for interconnecting first and second electrical networks, comprises a converter structure (12) which includes a first terminal (14) for connection to the first electrical network (16) and a second terminal (18) for connection to the second electrical network (20). The converter structure (12) also includes at least one module (38) that is connected between the first and second terminals (14, 18). The or each module (38) includes at least one energy storage device (40) and at least one switching element (46, 48). The or each energy storage element (40) and switching element (46,48) are operable to selectively provide a voltage source. The converter structure (12) still further includes an integrated passive fault current limiter (54) that is configured to present a first impedance to a normal current (I N ) flowing in the voltage source converter (10;80; 90) during normal operation of the voltage source converter (10; 80; 90), and is configured to present a second impedance to a fault current (I F ) flowing in the voltage source converter (10; 80; 90) during a fault condition. The first impedance is lower than the second impedance.
Abstract:
In the field of high voltage direct current (HVDC) power converters an electrical assembly (10; 100) for a voltage source sub-module (70; 150) comprises a first semiconductor device module (12) which includes a plurality of first semiconductor devices (14a, 14b, 4c). The electrical assembly (10; 100) also includes an energy storage device (34) which in turn includes a plurality of energy storage sections (36a, 36b, 36c) that are configured to control the magnitude of a current portion flowing through each first semiconductor device (14a, 14b, 14c). The energy storage sections (36a, 36b, 36c) are so configured by arranging each energy storage section (36a, 36b, 36c) in isolation from the or each other energy storage section (36a, 36b, 36c) to divide a current (l c ) flowing through the energy storage device (34) into a plurality of the said current portions (11, 12, 13) and thereby cause each current portion (11, 12, 13) to flow through a respective one of the plurality of energy storage sections (36a, 36b, 36c). The energy storage sections (36a, 36b, 36c) are still further so configured by connecting each energy storage section (36a, 36b, 36c) to a respective one of the plurality of first semiconductor devices (14a, 14b, 14c) whereby each first semiconductor device (14a, 14b, 14c) conducts the corresponding said current portion (I 1 , I 2 , I 3 ).
Abstract:
L'invention concerne une installation électrique haute tension comportant: - un premier appareillage électrique (12) comprenant un composant électrique; - au moins un deuxième appareillage électrique (22) raccordé au premier appareillage électrique (12) et qui comporte un composant électrique (38), - des moyens de raccordement électrique du composant électrique du premier appareillage électrique (12) avec le composant électrique (38) du deuxième appareillage électrique (22), caractérisée en ce que les moyens de raccordement électrique comportent une barre de raccordement (48) raccordée électriquement au composant électrique (38) de l'appareillage électrique et dont au moins une extrémité (52) de la barre de raccordement (48) est mobile et est apte à être raccordée ou à être séparée du composant électrique.
Abstract:
In the field of high voltage direct current (HVDC) power transmission networks, a voltage source converter (10) comprising a controller (36) configured to; receive an active power order comprising the desired amount of active power to be transferred by the convertor and receive an reactive power order comprising the desired amount of reactive power to be transferred by the convertor; receive a measurement of the instantaneous voltage of each phase of the multi- phase AC electrical network; determine an active and reactive phase current reference value for each single- phase limb which is independent of the or each other respective phase current reference and which defines the current each single-phase limb is required to draw from or pass to a corresponding phase of the AC electrical network to effect the active power and reactive power exchanges with the AC electrical network defined by the active and reactive power orders; the active phase current reference values determined based on the received active power order, the instantaneous voltage measurements and a determination of a resultant instantaneous reactive power using said active phase current reference values; and/or the reactive phase current reference values determined based on the received reactive power order, the instantaneous voltage measurements and a determination of a resultant instantaneous active power using said reactive phase current reference values.
Abstract:
A synthetic test circuit (30), for performing an electrical test on a device (52) under test, comprises: a terminal connectable to the device (52) under test; a current injection circuit (36) operably connected to the terminal, the current injection circuit (36) including a current source (42), the current source (42) including a chain-link converter, the chain-link converter including a plurality of modules, each module including at least one energy storage device; and a controller (50) configured to operate each module to selectively bypass the or each corresponding energy storage device and insert the or each corresponding energy storage device into the chain-link converter so as to generate a voltage across the chain- link converter and thereby operate the current injection circuit (36) to inject a current waveform (I) into the device (52) under test.