Abstract: Provided is a solid oxide fuel cell having longitudinal and lateral channels in an electronic separator plate. A solid oxide fuel cell includes a unit cell formed by stacking a cathode, electrolyte, and an anode, a separator plate having channels in both surfaces thereof, wherein reaction gas flows through the channels, and the channels include longitudinal channels parallel to a flow direction of the reaction gas, and lateral channels crossing the flow direction of the reaction gas, and a collector disposed between the unit cell and the separator plate. The longitudinal channels increase in width from a reaction gas inflow hole to a reaction gas outflow hole.

Abstract: Discloses is a turbine power generation system having an emergency operation means and an emergency operation method therefor that are capable of controlling excess heat accumulated during emergency operation, and recycling the accumulated heat. A turbine power generation system includes: an inlet sensor part including a thermometer, a pressure gauge, and a flowmeter that are installed between the heater and the inlet valve and; an emergency discharge part including a branch pipe connected to the steam, and a heat control means installed on the branch pipe. Accordingly, the system and the method are capable of reducing a heat overload during an emergency operation by transferring a heat amount exchanged in the heat storage device to the heat consuming facility, minimizing thermal consumption by recycling the same, and preventing various problems caused by stopping an operation of the turbine power generation system.

Abstract: Disclosed is a reaction-type steam turbine, including: a housing provided at a first side thereof with a steam inlet tube and at a second side thereof with a steam outlet tube, the housing having a space formed therein; and a turbine shaft provided to pass through the space of the housing, with a plurality of disk blades fitted over the turbine shaft, wherein a guide blade assembly is coupled to the turbine shaft at a position between a duct of the steam inlet tube and the disk blades, the guide blade assembly guiding steam introduced through the steam inlet tube into the space of the housing toward the disk blades.

Abstract: Embodiments of the present invention relate to a steam turbine in which unnecessary axial force is reduced. The steam turbine is capable of preventing a working fluid discharged from each nozzle-equipped rotary body from acting as resistance to the nozzle-equipped rotary bodies. The steam turbine includes a housing, a turbine shaft supported pivotably in the housing, a nozzle-equipped rotary body, and a guide panel. The nozzle-equipped rotary body is in the shape of a plurality of disks stacked along the axial direction of the turbine shaft, is integrally coupled to the turbine shaft, and has at least one or more nozzle holes formed therein so as to rotate as the working fluid is ejected. The guide panel is positioned at the rear end in a flow direction of the working fluid of the nozzle-equipped rotary body and fixed to the housing to guide the flow of the working fluid.

Abstract: Discloses is a turbine power generation system having an emergency operation means and an emergency operation method therefor that are capable of controlling excess heat accumulated during emergency operation, and recycling the accumulated heat. A turbine power generation system includes: an inlet sensor part including a thermometer, a pressure gauge, and a flowmeter that are installed between the heater and the inlet valve and; an emergency discharge part including a branch pipe connected to the steam, and a heat control means installed on the branch pipe. Accordingly, the system and the method are capable of reducing a heat overload during an emergency operation by transferring a heat amount exchanged in the heat storage device to the heat consuming facility, minimizing thermal consumption by recycling the same, and preventing various problems caused by stopping an operation of the turbine power generation system.

Abstract: A system for producing a heat source for heating or electricity, using medium/low-temperature waste heat includes: an absorption-type heat pump (100) supplied with a driving heat source and heat source water to heat a low-temperature heat medium; a regenerator heat exchange unit (210) for supplying a regenerator (110) with a driving heat source using waste heat; an evaporator heat exchange unit (220) for supplying an evaporator with heat source water; a heat medium circulation line (310) for circulating a heat medium; a generation unit (400) branching off from the heat medium circulation line (310) and producing electricity; a heat production unit (500) branching off from the heat medium circulation line (310) and supplying a heat-demanding place with a heat source for heating; and a switching valve unit (600) for controlling the flow of heat medium supplied the generation unit (400) or the heat production unit (500).

Abstract: An apparatus for controlling overcurrent of a grid-connected inverter due to an abnormal grid voltage includes a grid voltage sensor configured to sense a grid voltage according to an output current of the grid-connected inverter, a voltage variation calculator configured to calculate a D-axis voltage and a Q-axis voltage of the grid voltage to obtain variation values of the D-axis voltage and the Q-axis voltage, and an output current controller configured to determine whether at least one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds a set value of the grid voltage variation, and decrease the output current by a predetermined value when one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds the set value of the grid voltage variation.

Abstract: Provided are a heat recovery apparatus based on a fuel cell and an operating method thereof. In the fuel cell-based heat recovery apparatus and the operating method thereof, hot water and steam may be generated by using heat generated while a molten carbonate fuel cell (MCFC) operates to supply the generated hot water or steam to buildings, thereby reducing a rate of operation in cooling/heating equipment using electricity so as to reduce air-conditioning costs.

Abstract: Provided are a heat recovery apparatus based on a fuel cell and an operating method thereof. In the fuel cell-based heat recovery apparatus and the operating method thereof, hot water and steam may be generated by using heat generated while a molten carbonate fuel cell (MCFC) operates to supply the generated hot water or steam to buildings, thereby reducing a rate of operation in cooling/heating equipment using electricity so as to reduce air-conditioning costs.

Abstract: An apparatus and method for compensating for a ripple and offset of an inverter and an apparatus and method for compensating for a ripple and offset of an inverter which removes a ripple component by compensating for an offset component included in a signal input to the inverter from an inverter controller. A method that senses a direct current (DC) input to an inverter from an inverter controller and an alternating current (AC) output from the inverter and removes a ripple component included in the DC based on the sensed currents, a method that removes a ripple component included in a reference voltage that is output from an inverter controller and is input to an inverter, and a method that compensates for an offset component of an AC voltage/AC used for inverter control and reduces a ripple component corresponding to an output frequency of an inverter.

Abstract: An apparatus and method for compensating for a ripple and offset of an inverter and an apparatus and method for compensating for a ripple and offset of an inverter which removes a ripple component by compensating for an offset component included in a signal input to the inverter from an inverter controller. A method that senses a direct current (DC) input to an inverter from an inverter controller and an alternating current (AC) output from the inverter and removes a ripple component included in the DC based on the sensed currents, a method that removes a ripple component included in a reference voltage that is output from an inverter controller and is input to an inverter, and a method that compensates for an offset component of an AC voltage/AC used for inverter control and reduces a ripple component corresponding to an output frequency of an inverter.

Abstract: Provided is a fuel cell hybrid system. The fuel cell hybrid system includes a heat engine including a compression unit for compressing an oxidizer supply gas including air and an expansion unit for expanding the oxidizer supply gas to generate mechanical energy, a fuel cell including an anode for receiving a fuel gas, a cathode for receiving the oxidizer supply gas, and a catalytic combustor for burning a non-reaction fuel gas of an anode exhaust gas exhausted from the anode to heat the oxidizer supply gas, a first heat exchanger heat-exchanging the oxidizer supply gas discharged from the compression unit with a cathode exhaust gas exhausted from the cathode, and a second heat exchanger heat-exchanging the oxidizer supply gas discharged from the first heat exchanger with the oxidizer supply gas discharged from the catalytic combustor.

Abstract: Disclosed herein is a nozzle rotation body for a reaction-type steam turbine, the rotation body rotating by ejection of fluid from the nozzle. The rotation body includes: a disk-shaped body (210) having an shaft hole that is formed in the center thereof and coupled to a rotary shaft; a guide portion (220), projected in the vertical direction and integrally formed with the body (210) to have a guide side (GS) providing a plurality of exhaust flow paths (221) forming equal angles to each other in the helical direction around the shaft hole; a nozzle piece (230), positioned on each front end of the exhaust flow paths (221) and assembled with the body (210), to have a cross section of the same shape as the cross section of the exhaust flow paths (221) and have a narrow width section; and a fastening unit having at least one bolt (241) and at least one assembly pin (242) coupling the nozzle piece (230) and the body (210).

Abstract: A power generation system which generates electric power includes a fuel cell system in which supplied reactants react to generate electric power and a circulation system that circulates a product generated by the fuel cell system. The circulation system is configured to resupply at least some elements of the product generated by the fuel cell system as a reactant of the fuel cell system.

Abstract: A system for producing a heat source for heating or electricity, using medium/low-temperature waste heat includes: an absorption-type heat pump (100) supplied with a driving heat source and heat source water to heat a low-temperature heat medium; a regenerator heat exchange unit (210) for supplying a regenerator (110) with a driving heat source using waste heat; an evaporator heat exchange unit (220) for supplying an evaporator with heat source water; a heat medium circulation line (310) for circulating a heat medium; a generation unit (400) branching off from the heat medium circulation line (310) and producing electricity; a heat production unit (500) branching off from the heat medium circulation line (310) and supplying a heat-demanding place with a heat source for heating; and a switching valve unit (600) for controlling the flow of heat medium supplied the generation unit (400) or the heat production unit (500).

Abstract: Provided is a solid oxide fuel cell having longitudinal and lateral channels in an electronic separator plate. A solid oxide fuel cell includes a unit cell formed by stacking a cathode, electrolyte, and an anode, a separator plate having channels in both surfaces thereof, wherein reaction gas flows through the channels, and the channels include longitudinal channels parallel to a flow direction of the reaction gas, and lateral channels crossing the flow direction of the reaction gas, and a collector disposed between the unit cell and the separator plate. The longitudinal channels increase in width from a reaction gas inflow hole to a reaction gas outflow hole.

Abstract: A power generation system which is a fuel cell system including a preheating device that preheats a fuel, a preliminary reforming device that reforms the preheated fuel, a fuel cell stack module in which the reformed fuel reacts to generate electric power, and a circulating device that selectively supplies a product generated in the fuel cell stack module to the preheating device.