Abstract: A fiber filtering apparatus includes: an enclosure including an upper box and a lower box communicating with the upper box; a strainer installed in the upper box along a longitudinal direction; a plurality of fiber yarn media configured to be fixed to upper and lower fixing means each coupled to upper and lower parts of the strainer; a plurality of fiber ball media configured to be embedded in the lower box to form a second filtering layer; a first pipe configured to be formed on one side wall on the lower part of the upper box and introduced with raw water during filtration and drain backwashing water during backwashing; and a second pipe formed on one side wall on a lower part of the lower box and drain filtered water during the filtration and introduced with washing water during the backwashing.

Abstract: A locking spacer, which is fitted in a dovetail slot provided on an outer circumferential surface of a disk put on a rotor shaft, includes: a pair of first blocks each provided with a dovetail joint, and configured to have a size occupying a portion of an internal space of the dovetail slot; a pair of second blocks having a size occupying a portion of the internal space of the dovetail slot, the portion not being occupied by the pair of first blocks, and each being provided with a locking groove; and a locking block having a size occupying a portion of the internal space of the dovetail slot, the portion not being occupied by the first and second blocks, and being provided with a rotating locking arm configured such that opposite end portions thereof are inserted into the locking grooves.

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 processing apparatus for a stator bar of a generator according to an embodiment of the present disclosure may allow a worker to safely and easily perform welding on both ends of a plurality of stator bars to be installed in the generator, thereby improving workability.

Abstract: A nonpowered mixing and coagulation basin is provided, which generates turbulences of at least two kinds inside the mixing and coagulation basin to which the raw water flows so that foreign matters contained in the raw water come into contact with each other while circulating by a water flow to be coagulated into a predetermined size, and a dissolved air floatation device using the same. The nonpowered mixing and coagulation basin has multiple stages with different packing materials and packing densities to form turbulent flows inside the raw water and control a flow speed, thereby uniformly mixing raw water and coagulant to enhance coagulation efficiency. The nonpowered mixing and coagulation basin simultaneously carries out mixing and coagulation at the front end part of the water treatment system, reduces equipment expenses by having no electric motor and agitator, and reduces power consumption because it does not use any power unit.

Abstract: The present disclosure relates to a sewage/wastewater treatment system using granular activated sludge and a membrane bio-reactor and a sewage/wastewater treatment method using the same that are configured to effectively remove pollutants contained in raw water through a granulation tank in which the granular activated sludge is contained and to allow the raw water to be filtered through movable membranes located on the upper portion of the granulation tank. The system includes: an indirect aeration tank adapted to supply air thereto to allow dissolved oxygen contained in raw water to reach a saturation concentration; a granulation tank adapted to allow floating microorganisms contained in the treated water passing through the indirect aeration tank to be granulated and having a sludge blanket formed thereon; and movable membranes located on the upper portion of the granulation tank in such a manner as to be movable in the granulation tank.

Abstract: A digital protection system includes a process protection system having at least two channels and a reactor protection system having at least two trains. The process protection system includes, in one channel, first and second comparative logic controllers of different types that are mutually independent of each other and that respectively receive process variables as inputs and each outputting comparison logic results. The reactor protection system includes, in one train, first and second concurrent logic controllers of different types that are mutually independent from each other and that respectively receive the comparison logic results as inputs and each outputting concurrent logic results. The reactor protection system includes initiation circuits, each circuit including a plurality of relays connected in series and a plurality of relays connected in parallel.

Abstract: A bucket assembly for replacing an old bucket is provided with a turbine and a method for replacing the same. The bucket to be replaced is removed and then the bucket assembly configured of a blade part, first and second dovetail members, and a coupling member is simply assembled in a male dovetail, without sequentially disassembling the already installed buckets though a notch opening upon replacing the damaged bucket among the already installed buckets in a tangential entry type dovetail, thereby shortening replacement time and replacement costs of the bucket assembly and preventing a secondary damage occurring to the rotor or the rotor wheel during the disassembling process.

Abstract: A gas turbine disk includes a rotor and a tie-bolt. The rotor includes a plurality of blades and a plurality of disks. The plurality of blades are disposed on outer circumferential surfaces of the plurality of disks. The tie-bolt is disposed along a center axis of the rotor and through a bore defined through hollow portions of the plurality of disks, so as to couple the plurality of disks to each other. A diameter of the bore is larger than a diameter of the tie-bolt. The plurality of disks respectively include a groove spaced from the bore in the circumferential direction of the bore, the groove being elongated in the axial direction of the bore such that cooling air flows through an internal space thereof.

Abstract: A digital protection system is provided. The digital protection system may include: a process protection system including at least two channels, each channel including a first bistable logic controller and a second bistable logic controller which are independent and different from each other, the first bistable logic controller and the second bistable logic controller outputting bistable logic results; a reactor protection system including at least two trains, each train including a first coincidence logic controller and a second coincidence logic controller which are independent and different from each other, the first coincidence logic controller and the second coincidence logic controller outputting coincidence logic results by receiving the bistable logic results from the process protection system; and an initiation circuit normally operating or stopping a reactor according to the coincidence logic results received from the reactor protection system.

Abstract: An electrostatic precipitator module and a desulfurization system are capable of easily discharging wash water from a wet electrostatic precipitator module. The electrostatic precipitator module includes an arrangement of discharge electrodes and collecting electrodes alternately disposed and spaced apart from each other, the discharge electrodes configured to be charged to a predetermined voltage for generating a corona discharge between the discharge electrodes and the collecting electrodes; and tie rods for fixing the discharge electrodes and the collecting electrodes. Each collecting electrode has a lower edge inclined downward with respect to the ground. The lower edge of each collecting electrode includes separate lower edge portions respectively inclined downward from opposite side ends of the collecting electrode and a lowermost point at which wash water is concentrated and discharged to a discharge guide installed directly under the lowermost points.

Abstract: The present invention relates to a method and system for recovering carbonate from steel slag, in which it is possible to extract carbonate from steel slag and reuse the extracted carbonate, and to recycle steel slag and make use of CO2 gas without emission to the atmosphere. Since unreacted metal ions and an acidic solvent are reused in the method and system, it is possible to increase carbonate extraction efficiency and reduce an amount of waste.

Abstract: The present invention relates to a supercritical CO2 power generation system of a series recuperative type. According to an embodiment of the present invention, an inlet temperature of a turbine can be increased to increase a work of the turbine, thereby realizing a cycle design having improved turbine efficiency. Further, the number and diameter of pipes connected to a heat exchanger using an external heat source can be reduced to reduce the plumbing related costs, thereby improving economical efficiency.

Abstract: An air flow guide cap for inducing an air flow into a through hole of the floor includes: an upper surface upwardly inclined relative to a horizontal plane; and a wall surface downwardly extending along edges of the upper surface except the edge adjacent to an air inlet.

Abstract: A locking spacer, which is fitted in a dovetail slot provided on an outer circumferential surface of a disk put on a rotor shaft, includes: a pair of first blocks each provided with a dovetail joint and a stepped seating surface with a first bolt hole, and configured to have a size occupying a portion of an internal space of the dovetail slot; a second block having a size to be inserted into a remaining portion of the internal space of the dovetail slot, and having a height corresponding to the seating surfaces; a fixing plate seated on both the seating surfaces of the first blocks and an upper surface of the second block, and provided with second bolt holes corresponding to the first bolt holes; and a bolt screwed into the first bolt hole through an associated second bolt hole.

Abstract: A compressor blade locking device can include: a first support including a first locking groove; a second support including a left groove and a first protrusion corresponding to the first locking groove; a third support including a second locking groove; a fourth support including a right groove and a second protrusion corresponding to the second locking groove; a center support disposed between the second support and the fourth support; and a tab disposed in the center support, wherein the tab is configured to be turned such that the tab is disposed in the left groove and the right groove.

Abstract: Disclosed herein is a flocculation basin inclusion ion type water treatment apparatus using dissolved air floatation which includes: a flocculation basin which forms flocs by mixing a coagulant inserted into feed water and grows up the flocs; a contact zone to which fine bubbles are induced through a nozzle disposed at a lower part; and a separation zone which removes the flocs when the fine bubbles are attached to the flocs and the flocs float on the surface of water, the flocculation basin inclusion type water treatment apparatus including: a fine bubble forming part.

Abstract: A gas turbine includes protrusions provided on perimeters of front and rear surfaces of the turbine disk, a first retainer unit having openings at positions corresponding to the respective protrusions provided on the front surface of the turbine disk, and a second retainer unit having a first end thereof disposed in a first insert slot of the turbine disk and a second end thereof disposed in the second insert slot of turbine blades to fix the plurality of turbine blades to the turbine disk.

Abstract: A control valve includes a main body encasing a vapor channel configured to supply pressurized vapor from an evaporator to a turbine; an control unit, disposed in the vapor channel of the main body, for controlling an amount of vapor supplied to the turbine; and a load distributor, disposed between the control unit and the main body, for sealing the main body and for distributing to the main body a load applied to the control unit by the pressurized vapor in the vapor channel. The load distributor being fitted between the control unit and the main body enables the main body to be sealed, while distributing a load that has conventionally been concentrated on the cover and the cover studs. Since a load is distributed to the main body, a control valve for power generation systems can be designed with a smaller cover and smaller cover studs.

Abstract: A gas turbine includes a bearing housing surrounding an outside of a tie rod provided on the turbine. One end of a power strut is connected to an outside of the bearing housing, and the other end is radially arranged outwards. A cooling-air supply unit supplies cooling air to the power strut. A heat exchange unit is disposed in the power strut to perform a heat exchange process with cooling air supplied through the cooling-air supply unit. A ring-shaped support frame is connected to the other end of the power strut.