Abstract: A method for predicting consumer power demand uses power consumption data measured over a long term and a power usage pattern immediately before a target time and for controlling ESS charge/discharge of an ESS based on the predicted power demand. A power demand prediction apparatus using the method includes respective components for collecting weather data and data on power used by the consumer; selecting data points according to a preset condition from among data collected by the data collector based on a specific time span; generating long term prediction data for the power demand in the specific time span based on the selected data points; analyzing a power usage pattern immediately before the specific time span and comparing the power usage pattern with the long-term prediction data, to determine whether prediction data correction is required; and correcting the prediction data based on the power usage pattern when correction is required.

Abstract: A gas turbine system, and a control apparatus and method thereof, can control the amount of compressed air supplied to each of a combustor and an anti-icing unit in order to improve the droop control performance of the gas turbine system. The control apparatus of the gas turbine system may include a sensing unit to measure a rotor speed of the turbine; and a compressed air distribution unit to adjust a distribution ratio of the compressed air supplied to the combustor to the compressed air supplied to the anti-icing unit, based on the measured rotor speed. The control apparatus can increase the amount of compressed air supplied to the combustor even though the revolution number of the turbine connected with a system frequency may be significantly lowered.

Abstract: Disclosed herein are a real-time gas turbine simulation system and an execution method thereof, capable of verifying input and output signals of an actual gas turbine control system (GTCS) by simulating a gas turbine in real time to reduce trial and error in power plant operation in a gas turbine power generation system. The real-time gas turbine simulation system simulates a gas turbine to verify a GTCS for controlling a gas fuel through an actuator/sensor module and a safety integrity level (SIL) protection function through a protection module for the gas turbine, and includes a hardwire-in-the-loop (HIL) simulator connected to the actuator/sensor module and the protection module through one or more hardwires to simulate a time critical portion of the gas turbine in real time, and a network simulator connected to the GTCS through a network to simulate a non-time critical portion of the gas turbine in real time.

Abstract: Disclosed is a turbine blade including a blade part having an airfoil in a cross section having a leading edge, a trailing edge, and a pressure surface and a suction surface connecting the leading edge and the trailing edge, the blade part extending radially from a platform part to a tip portion as a free end in the turbine blade, wherein a cavity through which cooling air flows is formed inside the turbine blade, wherein a squealer tip having a predetermined thickness protrudes along an edge of the tip portion so that a squealer pocket is formed on an inner side of the tip portion by the squealer tip, wherein the squealer tip is provided with a cooling hole communicating with the cavity along a radial direction of the turbine blade, and wherein an undercut is formed around the cooling hole of the squealer tip by cutting a part of the squealer tip in a circumferential direction.

Abstract: A transition piece can include: an inner transition piece including an inlet and an outlet; an outer transition piece surrounding the inner transition piece with a flow passage; an outlet fin-pin flow guide disposed on the inner transition piece and located closer to the outlet than the inlet; a first bottom fin disposed at a bottom portion of the inner transition piece; and a second bottom fin disposed at the bottom portion of the inner transition piece, wherein the first bottom fin and the second bottom fin are arranged to be inclined to each other at an acute angle.

Abstract: A method of predicting plant data in a system generates prediction data based on a plant prediction model and for detecting anomalies of the plant by comparing the prediction data with measurement data. The method can provide precise prediction data in a normal state even though the measurement data contains data in an anomalous state. Anomaly/fault prediction accuracy is enhanced by providing precise prediction data in the normal state. An apparatus using the method includes a plant modeling unit for generating a plant prediction model based on k-nearest neighbors (k-NN) by modeling a plant based on measurement data of multiple tags; and a prediction data generating unit for measuring similarity between the plant prediction model and the measurement data, determining a parameter k value based on the similarity, and generating plant normal state prediction data based on the determined parameter k value and the measured similarity.

Abstract: The present disclosure relates to a redox flow battery using an electrolyte concentration gradient, capable of increasing the efficiency of the redox flow battery, and to an operation method thereof. The redox flow battery includes a catholyte tank having an electrolyte inlet at the top thereof and an electrolyte outlet at the bottom thereof and having a partition plate for forming a concentration gradient of a catholyte received therein, an anolyte tank having an electrolyte inlet at the top thereof and an electrolyte outlet at the bottom thereof and having a partition plate for forming a concentration gradient of an anolyte received therein, and a stack for charging and discharging power by receiving the catholyte and the anolyte supplied from the catholyte tank and the anolyte tank.

Abstract: A turbine blade retention system includes a turbine blade including a blade section and a blade platform on which the blade section is attached, the blade platform including a forward angel wing and an aft angel wing, the forward angel wing including a front blade seal groove, a disk configured to receive a plurality of the turbine blades, the disk including a front disk seal groove and an aft disk seal groove, a front seal plate, and an aft seal plate, wherein the front seal plate is slidably connectable to the turbine blade and the disk via the front blade seal groove and the front disk seal groove, and the aft seal plate is removably connectable to the turbine blade and the disk via the aft disk seal groove and a lower wall formed on the aft angel wing.

Abstract: A conjunction assembly provides a seal, in a connected state, between a conjunction ring constituting an outlet of a combustor and a turbine inlet cylinder constituting an inlet of the turbine. The conjunction assembly includes a connecting member that protrudes from the conjunction ring; a connecting groove for receiving the connecting member, the connecting groove formed in the turbine inlet cylinder; and a connection sealing member disposed between the connecting member and an inner surface of the turbine inlet cylinder to provide a seal between the connecting member and the inner surface of the turbine inlet cylinder. The connecting member is a ring-like structure formed on a rear-side surface of the conjunction ring, the rear-side surface facing the turbine inlet cylinder, and the connecting groove is formed in a front-side surface of the turbine inlet cylinder in correspondence to the connecting member, the front-side surface facing the conjunction ring.

Abstract: A rotating unit of a steam turbine includes a rotor; a bucket coupled to the rotor to convert fluid energy into mechanical work, the coupled bucket being pre-twisted at a predetermined angle, the bucket having a base surface facing a point of coupling between the rotor and the bucket; and bucket support means, provided at the point of coupling between the rotor and the bucket, for supporting a twisted state of the bucket based on the coupling between the rotor and the bucket, thereby enabling the twisting of the bucket to be maintained during operation. In a steam turbine including the rotating unit, it is possible to reduce vibration occurring during operation and to increase the contact force between a cover formed at the blade tip of the bucket and a cover of another bucket to prevent a leakage of steam between adjacent covers.

Abstract: A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a first barrier partitioning the space into first and second chamber regions, a flue gas inlet to introduce raw flue gas into the first chamber region, and a flue gas outlet to discharge desulfurized flue gas from the second chamber region; a second barrier partitioning a slurry reservoir into a first reservoir part to store a first pH alkaline slurry and a second reservoir part to store a second pH alkaline slurry; a first sprayer to spray the alkaline slurry from the first reservoir part into the first chamber region to remove sulfur from the flue gas in the first chamber region; and a second sprayer to spray the alkaline slurry from the second reservoir part into the second chamber region to remove sulfur from the flue gas in the second chamber region.

Abstract: A wet desulfurization apparatus includes a chamber enclosing a space for passing flue gas and including a tubular barrier partitioning the space into an inner chamber region having a first volume and an outer chamber region surrounding the inner chamber region and having a second volume, a flue gas inlet to introduce raw flue gas into the outer chamber region, and a flue gas outlet to discharge desulfurized flue gas from the inner chamber region; a slurry reservoir disposed under the chamber to receive and store an alkaline slurry; first and second sprayers to spray the alkaline slurry into the outer and inner chamber regions, respectively, in order to remove sulfur from the flue gas in the corresponding chamber region; and a demister disposed in the inner chamber region between the second sprayer and the flue gas outlet to remove mist from the flue gas in the inner chamber region.

Abstract: A turbine blade is provided with a rotatable leading edge to reduce pressure loss as a flow direction of combustion gas varies. The turbine blade includes an airfoil including as separate bodies a trailing-edge portion and a leading-edge portion being linked to the trailing-edge portion and disposed upstream of the trailing-edge portion, the leading-edge portion including a front surface arranged on an upstream side of the leading-edge portion; and a rotary unit connected to the leading-edge portion and configured to rotate the leading-edge portion according to an inflow angle of the combustion gas such that the front surface faces a flow of the combustion gas. A barrier wall extends from a side surface of the leading-edge portion toward an open end of the trailing edge portion, and when the leading-edge portion is rotated, the barrier wall portion prevents formation of a gap between the side surface and the open end.

Abstract: A transition piece support structure for a gas turbine combustor, and a method of installing same, reliably prevent leakage at the flange of a lower-side combustor, which is greatly influenced by gravity. The structure supports a rear end portion of a transition piece when fixed to a turbine end and includes a flange provided at a rear end of the transition piece, to be coupled to the end of the turbine, the flange having a shape to fit a periphery of a turbine inlet; a support bracket integrated with an upper surface of a flow sleeve surrounding an outer surface of the transition piece, to face the end of the turbine coupled to the flange; and a connection piece fixed to the end of the turbine and configured to be coupled to the support bracket in a hinged manner allowing the flange to pivotally approach the turbine inlet.

Abstract: A plate for supporting a plurality of nozzle tubes in a combustion casing of a combustor stably supports the nozzle tubes and adsorbs displacement due to thermal expansion or natural vibrations, thereby reducing combustor maintenance and extending the lifetime of the combustor. The plate includes an inner frame having a plurality of through holes for respectively receiving the plurality of nozzle tubes; a fixing frame fixed on an inner circumferential surface of the combustion casing and configured to support the inner frame; and a mechanical buffer disposed between the fixing frame and the inner frame. The fixing frame has an inner circumferential surface in which a fixing recess having a U-shaped cross-section is formed to receive the mechanical buffer and an outer edge of the inner frame and to receive the mechanical buffer. A method of assembly the nozzle tube support plate facilitates its initial installation and subsequent maintenance.

Abstract: A turbine blade ring segment includes an inner panel mounted to an inner surface of a turbine casing, the inner panel including a plurality of flow holes for supplying cooling air from an outside of the turbine casing; and an outer panel disposed on one surface of the inner panel, the outer panel including a plurality of air passages communicating with the flow holes formed in the inner panel. The passages include a first flow passage formed in a central portion of the outer panel to guide the supplied cooling air in a flow direction of the combustion gas, a second flow passage formed in the outer panel separately from the first flow passage to guide the supplied cooling air in the flow direction of the combustion gas, and a third flow passage communicating with the second flow passage to feed the supplied cooling air to the second flow passage.

Abstract: A combustion apparatus can avoid instability in combustion by controlling a pressure ratio of fuel mixed with air. The combustion apparatus includes a casing; a pilot nozzle disposed at the center of the casing and supplied with fuel by a pilot fuel supply pipe; and a plurality of main nozzles arranged around the pilot nozzle and supplied with fuel by a main fuel supply pipe, each main nozzle including a pair of parallel fuel channels each extending to a respective fuel spray position within the main nozzle. A gas turbine adopting the combustion apparatus includes a plurality of combustors, each combustor including the casing, pilot nozzle, and plurality of main nozzles, with each main nozzle having first and second fuel channels respectively extending to a fuel spray position of the corresponding fuel channel. A pilot manifold connects the respective pilot nozzles, and a main manifold connects the respective main nozzles.

Abstract: A system for coating a heat transfer tube for a condenser is disclosed. The system simplifies a process of coating the heat transfer tube, and is able to uniformly coat a plurality of heat transfer tubes. In addition, the system is economically feasible in that coating solution can be reused by collecting and circulating it. Due to super-hydrophobic coating, the size of a droplet condensed on the surfaces of the heat transfer tubes coated by the system can be reduced, and a condensation heat transfer coefficient can be increased.

Abstract: A method for manufacturing a capacitive deionization electrode exhibits enhanced ionic material adsorption efficiency. The method includes (a) kneading an electrode active material while adding a solvent to the electrode active material; (b) adding a solvent to the mixture obtained after (a) and stirring the result; and (c) preparing an electrode slurry by adding a binder to the mixture obtained after (b) and stirring the result. According to the method, a problem of a binder blocking electrode pores, which used to occur when using existing methods, is resolved by increasing mixing efficiency of the binder while using an electrode active material having a high specific surface area. A capacitive deionization electrode having very superior ionic material adsorption efficiency may be manufactured using the method.

Abstract: A stacked type falling film evaporator includes a first evaporator, a second evaporator, a first vapor recovering device, a second vapor recovering device and a vapor recompressor. The first evaporator and the second evaporator respectively have evaporation tubes of a length of 5 m to 10 m, and are stacked in such a manner that wastewater passes through the first evaporator and the second evaporator in order. The first vapor recovering device collects vapor generated from the wastewater in the first evaporator and supplies the collected vapor to the second evaporator. The second vapor recovering device collects vapor generated from the wastewater in the second evaporator and supplies the collected vapor to the first evaporator. The vapor recompressor compresses the vapor collected in the second vapor recovering device before the vapor is supplied to the first evaporator.