Abstract:
A method of synchronizing an equipment unit (200) connected to a communications network (110), the equipment unit being connected to an electrical power supply network (120) providing at least one alternating current power supply voltage (121), the method including the steps of measuring a time difference between the power supply voltage and a synchronization voltage (131), computing a synchronization value, communicating the synchronization value to the equipment unit, the equipment unit detecting the power supply voltage passing through the given state, and synchronizing the equipment unit substantially simultaneously with detecting the supply voltage passing through the given state from the synchronization value. The invention also relates to a synchronization device (300) and a synchronization module (400) used in the synchronization method.
Abstract:
The invention relates to a pulverized coal burner for a steam generator. The pulverized coal burner has a fuel duct, through which pulverized coal is conveyed with the aid of a carrier gas. The pulverized coal emerges together with the carrier gas at a fuel duct outlet. The pulverized coal burner furthermore has at least one core duct and at least one secondary duct. Air or oxygen flows through the core duct and the secondary duct, emerging at the core duct outlet and at the secondary duct outlet. The core duct outlet, the secondary duct outlet and the fuel duct outlet together form a burner outlet. The pulverized coal burner has at least one plasma ignition torch embodied integrally with the pulverized coal burner. The outlet of the at least one plasma ignition torch is arranged in the plane of the burner outlet or offset downstream in relation to the direction of flow of the pulverized coal. The plasma flame produced by the plasma ignition torch is thus located outside the fuel duct.
Abstract:
A method of cleaning at least one collecting electrode of an electrostatic precipitator includes applying, in a first mode of operation, a first average current between at least one discharge electrode and at least one collecting electrode, and switching from the first mode of operation to a second mode of operation in which a second average current is applied between the at least one discharge electrode and the at least one collecting electrode, the second average current being a factor of at least 3 higher than the first average current, to achieve a forced cleaning of the at least one collecting electrode.
Abstract:
Method for operating a combined-cycle power plant is provided. The plant includes at least a gas turbine and at least a steam power generation system. The plant activates at least one electric generator connectable to an electric grid, wherein the gas turbine includes a compressor. The steam power generation system includes a steam turbine, a heat recovery steam generator and a bypass line. The method is such that the gas turbine de-loads to a condition, where the compressor operates at its nominal speed. The method is such that the steam turbine de-loads in coordination with the de-load of the gas turbine, to a condition where the total load exported by the plant to the grid is substantially equal to zero, being both the gas turbine and the steam power generation system connected.
Abstract:
A method for starting-up a steam turbine of a combined-cycle power plant is provided. The combined-cycle power plant includes a gas turbine and a steam power generation system having a steam turbine. The combined-cycle power plant activates at least one electric generator connectable to an electric grid. The gas turbine includes a compressor, such that, during starting-up of the steam turbine, both the gas turbine and the steam turbine are in operation. The steam turbine adjusts its load as a function of the load of the gas turbine in such a way that the sum of the load provided by the gas turbine and of the load provided by the steam turbine is equal to the auxiliary power demand of the plant. The load exported to the grid is equal to zero.
Abstract:
A method for reducing mercury emission and/or re-emission in cleaned flue gas through control of sulfite concentration within a wet flue gas desulfurization (WFGD) system is disclosed. One method for reducing mercury emission and/or re-emission through control of sulfite concentration is to measure the sulfite concentration of an aqueous alkaline slurry used in a WFGD system and comparing the same to a predetermined sulfite concentration value. If the comparison reveals the measured sulfite concentration is above the predetermined values, the amount of oxidation air supplied to the system is increased. If the comparison reveals the measured sulfite concentration is below the predetermined values, the amount of oxidation air supplied to the system is decreased.
Abstract:
The invention relates to a modular blade or vane for a gas turbine, which includes the modular components of a platform element with a planar or contoured surface defining a platform level and a through-opening therein, and an airfoil, extending through the platform element. The airfoil includes a load carrying structure extending along a longitudinal axis of the airfoil, having a root portion for fastening on a blade or vane carrier of the gas turbine, having a tip portion, and having at least one interior passage, extending from the root portion to the tip portion of the airfoil. An aerodynamically shaped shell extends in a distance over the carrying structure and defining the outer contour of the airfoil. A longitudinally extending gap, is disposed between the carrying structure and the shell. A number of through-holes in the carrying structure direct a cooling medium from the interior passage into the gap. The shell is integrally joined to said carrying structure by a first joint in a region below the platform level of the platform element. The shell is joined to the carrying structure by at least one additional joint, wherein said at least one additional joint is a form-fit joint, allowing relative movement in longitudinal direction between shell and carrying structure.
Abstract:
A power generating unit includes a gas turbine with an air intake section, a compressor and at least one combustor and at least one turbine The power generating unit further includes a gas-cooled generator, being driven by the gas turbine and having a generator cooling system including at least one cooler, through which cooling water flows, and which removes heat from the generator. A more flexible operation of the unit can be achieved by connecting the generator cooling system to an air intake heat exchanger arranged within the air intake section of the gas turbine in order to transfer heat from the cooling water flowing through the generator cooling system, to the air flowing through the air intake section.
Abstract:
The present invention relates to a gas turbine power generation system, that includes a hydrogen-cooled generator having hydrogen as coolant, a plant hydrogen storage, generator auxiliaries and an emergency power supply system. The power generation system includes a fuel cell using hydrogen as fuel. The fuel cell is supplied via a line with hydrogen fuel from the hydrogen filling of the hydrogen-cooled generator in case of failure or disruption of the power supply from the gas turbine power generation system. In a preferred embodiment the fuel cell is supplied with additional hydrogen via a line from the plant hydrogen storage and/or with additional hydrogen via a line from generator auxiliaries in case of failure or disruption of the power supply from the gas turbine power generation system.
Abstract:
A carbon dioxide removal system includes a chilled ammonia carbon capture system; an absorber refrigeration system in fluid communication with the chilled ammonia system; and a heat recovery steam generator (HSRG) in fluid communication with the chilled ammonia system and the absorber refrigeration system.