Abstract: A gas turbine includes: a compressor configured to compress air; a combustor configured to combust fuel in the air compressed by the compressor so as to generate combustion gas; and a turbine configured to be driven using the combustion gas. Air coolers are configured to bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places so as to generate cooling air. A waste heat recovery device is configured to recover waste heat from at least two of the air coolers.

Abstract: A heat exchange system includes: a gas line through which a gas to be cooled flows; a first heat exchanger disposed in the gas line and configured to cool the gas through heat exchange with a refrigerant; a refrigerant introduction line for introducing the refrigerant into the first heat exchanger; a refrigerant discharge line for discharging the refrigerant after cooling the gas from the first heat exchanger; a recirculation line for recirculating at least a part of the refrigerant flowing through the refrigerant discharge line into the refrigerant introduction line; and a flow-rate adjustment unit for adjusting a flow rate of the refrigerant flowing through the recirculation line so that a temperature of the refrigerant introduced into the first heat exchanger from the refrigerant introduction line is not lower than a threshold.

Abstract: A boiler including one or more evaporators, an economizer, and a low-temperature heat exchanger. The economizer is located on a downstream side of the most downstream evaporator which is an evaporator at the most downstream side among the one or more evaporators. The low-temperature heat exchanger is located on the downstream side of the economizer, has an inlet for receiving water from the outside, and is configured to heat the water introduced from the inlet and sent to the economizer with the combustion gas.

Abstract: A gas turbine includes: a compressor configured to compress air; a combustor configured to combust fuel in the air compressed by the compressor so as to generate combustion gas; and a turbine configured to be driven using the combustion gas. Air coolers are configured to bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places so as to generate cooling air. A waste heat recovery device is configured to recover waste heat from at least two of the air coolers.

Abstract: Provided are: a power generation system that can generate electric power efficiently with a fuel cell; and a method for operating said power generation system. This power generation system comprises: a fuel cell including a plurality of unit fuel cell modules; a gas turbine; various lines for circulating fuel gas, air, discharged fuel gas, and discharged air between the fuel cell and the gas turbine; and a control device. The control device determines the number of said unit fuel cell modules to be operated on the basis of the required power generation amount, and operates the determined number of said unit fuel cell modules.

Abstract: This power generation system is provided with: a gas turbine having a compressor, a combustor and a turbine; a first compressed air supply line that supplies compressed air, which has been compressed by the compressor, to the combustor; a solid oxide fuel cell (SOFC) having an air electrode and a fuel electrode; a compressed air supply device capable of generating compressed air; and a second compressed air supply line that supplies compressed air, which has been compressed by the compressed air supply device to the SOFC. The fuel cell can thus be stably operated regardless of the operating state of the gas turbine.

Abstract: A power generation system includes a gas turbine having a compressor, a combustor, and a turbine, an inlet guide vane in an air intake port in the compressor, a first compressed air supply line for supplying compressed air compressed by the compressor to the combustor, a solid oxide fuel cell (SOFC) having an air electrode and a fuel electrode, a second compressed air supply line for supplying at least part of the compressed air compressed by the compressor to the air electrode, a control valve in the second compressed air supply line, and a control device for opening the control valve when the SOFC is activated and changing a degree of opening of the inlet guide vane from a preset reference degree of opening.

Abstract: A waste heat recovery device includes: a low-boiling-point medium Rankine cycle in which a low-boiling-point medium circulates while the low-boiling-point medium is repeatedly condensed and evaporated; a heated water line that guides liquid water, which is heated here, to the low-boiling-point medium Rankine cycle from a waste heat recovery boiler; and a water recovery line that returns the water, which has passed through the low-boiling-point medium Rankine cycle, to the waste heat recovery boiler. The low-boiling-point medium Rankine cycle includes a heater that heats the low-boiling-point medium by exchanging heat between the low-boiling-point medium, which is a liquid, and liquid water, which has passed through the heated water line.

Abstract: A heat exchange system includes: a gas line through which a gas to be cooled flows; a first heat exchanger disposed in the gas line and configured to cool the gas through heat exchange with a refrigerant; a refrigerant introduction line for introducing the refrigerant into the first heat exchanger; a refrigerant discharge line for discharging the refrigerant after cooling the gas from the first heat exchanger; a recirculation line for recirculating at least a part of the refrigerant flowing through the refrigerant discharge line into the refrigerant introduction line; and a flow-rate adjustment unit for adjusting a flow rate of the refrigerant flowing through the recirculation line so that a temperature of the refrigerant introduced into the first heat exchanger from the refrigerant introduction line is not lower than a threshold.

Abstract: A power generation system includes a gas turbine having a compressor, a combustor, and a turbine, an inlet guide vane in an air intake port in the compressor, a first compressed air supply line for supplying compressed air compressed by the compressor to the combustor, a solid oxide fuel cell (SOFC) having an air electrode and a fuel electrode, a second compressed air supply line for supplying at least part of the compressed air compressed by the compressor to the air electrode, a control valve in the second compressed air supply line, and a control device for opening the control valve when the SOFC is activated and changing a degree of opening of the inlet guide vane from a preset reference degree of opening.

Abstract: A power generation system includes a gas turbine having a compressor, a combustor, and a turbine, an inlet guide vane in an air intake port in the compressor, a first compressed air supply line for supplying compressed air compressed by the compressor to the combustor, a solid oxide fuel cell (SOFC) having an air electrode and a fuel electrode, a second compressed air supply line for supplying at least part of the compressed air compressed by the compressor to the air electrode, a control valve in the second compressed air supply line, and a control device for opening the control valve when the SOFC is activated and changing a degree of opening of the inlet guide vane from a preset reference degree of opening.

Abstract: A power generation system having a gas turbine, a fuel cell, an exhaust air circulation line, an exhaust fuel gas supply line, a turbine, an exhaust heat recovery boiler, and at least one exhaust air heat exchanger. The turbine is equipped with a high-pressure turbine, a medium-pressure turbine, and a low-pressure turbine. The exhaust heat recovery boiler is equipped with a high-pressure steam circulation mechanism, a medium-pressure steam circulation mechanism, and a low-pressure steam circulation mechanism. The exhaust air heat exchanger exchanges heat between the steam exchanging heat with the exhaust gas in the high-pressure steam circulation mechanism or the medium-pressure steam circulation mechanism and flowing toward the turbine and the exhaust gas flowing through the exhaust air circulation line, thereby increasing the temperature of the steam and decreasing the temperature of the exhaust gas.

Abstract: A boiler including one or more evaporators, an economizer, and a low-temperature heat exchanger. The economizer is located on a downstream side of the most downstream evaporator which is an evaporator at the most downstream side among the one or more evaporators. The low-temperature heat exchanger is located on the downstream side of the economizer, has an inlet for receiving water from the outside, and is configured to heat the water introduced from the inlet and sent to the economizer with the combustion gas.

Abstract: In order to protect the temperature of an exhaust stream in an exhaust line, even if the temperature of the exhaust stream discharged from a fuel cell exceeds a temperature during rated operation, a power generation system has: an SOFC; an exhaust air line or an exhaust fuel line, wherein the exhaust air line and exhaust fuel line carry exhaust air and exhaust fuel gas discharged from the SOFC, respectively; a temperature detector for detecting the temperature of the exhaust air or the exhaust fuel gas discharged from the SOFC or the temperature of the exhaust air line or the exhaust fuel line; an exhaust cooling device for cooling the exhaust air in the exhaust air line or the exhaust fuel gas in the exhaust fuel line; and a control device for activating the exhaust cooling device when the temperature detected by the temperature detector exceeds a predetermined temperature.

Abstract: The present invention enables a fuel cell to be stably started by minimizing a lack of air in a gas turbine when starting the fuel cell.

Abstract: This power generation system is provided with: a gas turbine (11) having a compressor (21), a combustor (22) and a turbine (23); a first compressed air supply line (26) that supplies compressed air, which has been compressed by the compressor (21), to the combustor (22); a solid oxide fuel cell (SOFC) (13) having an air electrode and a fuel electrode; a compressed air supply device (61) capable of generating compressed air; and a second compressed air supply line (31) that supplies compressed air, which has been compressed by the compressed air supply device (61) to the SOFC (13). The fuel cell can thus be stably operated regardless of the operating state of the gas turbine.

Abstract: This power generation system is provided with: a gas turbine having a compressor, a combustor and a turbine; a first compressed air supply line that supplies compressed air, which has been compressed by the compressor, to the combustor; a solid oxide fuel cell (SOFC) having an air electrode and a fuel electrode; a compressed air supply device capable of generating compressed air; and a second compressed air supply line that supplies compressed air, which has been compressed by the compressed air supply device to the SOFC. The fuel cell can thus be stably operated regardless of the operating state of the gas turbine.

Abstract: A gas turbine including: a compressor that compresses air; a combustor that combusts fuel in the compressed air so as to generate combustion gas; and a turbine that is driven using the combustion gas. A plurality of cooling air coolers bleed the air from a plurality of places having different pressures in the compressor and cool the air bled from the respective places, thereby generating cooling air is provided. A waste heat recovery device that recovers waste heat from the at least two cooling air coolers among the plurality of cooling air coolers is provided.

Abstract: A waste heat recovery device includes: a low-boiling-point medium Rankine cycle in which a low-boiling-point medium circulates while the low-boiling-point medium is repeatedly condensed and evaporated; a heated water line that guides liquid water, which is heated here, to the low-boiling-point medium Rankine cycle from a waste heat recovery boiler; and a water recovery line that returns the water, which has passed through the low-boiling-point medium Rankine cycle, to the waste heat recovery boiler. The low-boiling-point medium Rankine cycle includes a heater that heats the low-boiling-point medium by exchanging heat between the low-boiling-point medium, which is a liquid, and liquid water, which has passed through the heated water line.

Abstract: The invention provides a gas-turbine fuel nozzle that includes a plurality of fuel supply channels to which fuel is supplied, a plurality of fuel/sweep-fluid supply channels to which fuel or a sweep fluid for sweeping the fuel is supplied, and a plurality of injection holes that are provided at downstream ends of the fuel supply channels or the fuel/sweep-fluid supply channels and that inject the fuel guided from the fuel supply channels or the fuel/sweep-fluid supply channels; a sweep-fluid supply channel that is connected to the fuel/sweep-fluid supply channels to guide the sweeping; and sweep-fluid cooling means for cooling the sweep-fluid to a temperature lower than a self-ignition temperature of the fuel.