Abstract: A control device for a power generation system whereby power is generated by a first power source that operates by burning a fuel. The control device identifies, on the basis of a pressure difference in a prior-stage mechanism that supplies the fuel to the first power source, a fuel capacity that compensates for the pressure difference in the prior-stage mechanism. The pressure difference is the difference between a pressure set for the fuel before a load change in the prior-stage mechanism and a pressure set for the fuel after the load change in the prior-stage mechanism. The control device calculates a fuel supply command value, which is a command value for adjusting the amount of fuel supplied to a fuel supply device that supplies the fuel to the first power source, and is output to the fuel supply device using a fuel supply acceleration command value.

Abstract: This IGCC plant is provided with an ASU which separates oxygen gas and nitrogen gas from air, a coal gasification furnace which uses an oxidizing agent to gasify coal, and a gas turbine which is driven by the combustion gas resulting from burning a gas generated by means of the coal gasification furnace. This IGCC plant control device (50) is provided with an air separation amount determination unit (52) which determines the production amount of nitrogen gas produced by the ASU depending on the operating load of the IGCC plant, and supplies to the coal gasification furnace the entire amount of oxygen gas generated as a byproduct in response to the determined nitrogen gas production amount. By this means, the IGCC plant can minimize blow-off of oxygen gas produced from the air.

Abstract: An IGCC plant includes a coal gasifier that gasifies coal by using an oxidizer, a gas turbine that is driven by combustion gas generated by combustion of fuel gas obtained by purifying gas generated by the coal gasifier in gas clean-up equipment, and an oxidizer supply path for supplying air extracted from an air compressor of the gas turbine or oxygen separated from the air as an oxidizer for the coal gasifier. A control unit (50) for the gasification power generation plant controls the amount of the oxidizer that is supplied to the coal gasifier to be less than or equal to a predetermined upper-limit value, while allowing deviation of an air ratio from a predetermined set value, the air ratio representing the ratio of the amount of air that is supplied to the coal gasifier relative to a theoretical amount of air for combustion of carbon, in accordance with variations in an operating-state quantity of the coal gasifier or variations in a load of the IGCC plant.

Abstract: There is provided a control device of a coal pulverizer which enables estimation of a coal output with a precision suited for a purpose. In a control device of a coal pulverizer which pulverizes coal by the coal pulverizer and estimates coal output by which the pulverized coal is output to a boiler, the control device includes a main operation circuit which calculates a command signal associated with a coal feed rate on the basis of detection data from a boiler or a power generator connected to the boiler, and an additional control unit which calculates the deviation between a standard coal output pattern preset in the coal pulverizer, and a current coal output pattern, and adds a calculation result by the additional control unit to the main operation circuit as a correction signal.

Abstract: To provide a condensate flow rate control device and a control method for a power plant which improve responsiveness to frequency fluctuations or requested load changes and can suppress frequency fluctuations with precision or improve precision with which output power conforms to requested load instructions. A power plant to which a condensate flow rate control device is adapted includes a deaerator to which condensate generated by a condenser is supplied via a deaerator water level adjustment valve and into which bleed steam from a steam turbine is introduced. The condensate flow rate control device has a water level adjustment unit for executing condensate flow rate control, wherein the water level adjustment unit adjusts pressure in a condensate flow path extending from the deaerator water level adjustment valve to the deaerator so that inputted frequency fluctuations are suppressed or an output value of a generator conforms to inputted requested load changes.

Abstract: A control device for a power generation system whereby power is generated by a first power source that operates by burning a fuel. The control device identifies, on the basis of a pressure difference in a prior-stage mechanism that supplies the fuel to the first power source, a fuel capacity that compensates for the pressure difference in the prior-stage mechanism. The pressure difference is the difference between a pressure set for the fuel before a load change in the prior-stage mechanism and a pressure set for the fuel after the load change in the prior-stage mechanism. The control device calculates a fuel supply command value, which is a command value for adjusting the amount of fuel supplied to a fuel supply device that supplies the fuel to the first power source, and is output to the fuel supply device using a fuel supply acceleration command value.

Abstract: An IGCC plant includes a coal gasifier that gasifies coal by using an oxidizer, a gas turbine that is driven by combustion gas generated by combustion of fuel gas obtained by purifying gas generated by the coal gasifier in gas clean-up equipment, and an oxidizer supply path for supplying air extracted from an air compressor of the gas turbine or oxygen separated from the air as an oxidizer for the coal gasifier. A control unit (50) for the gasification power generation plant controls the amount of the oxidizer that is supplied to the coal gasifier to be less than or equal to a predetermined upper-limit value, while allowing deviation of an air ratio from a predetermined set value, the air ratio representing the ratio of the amount of air that is supplied to the coal gasifier relative to a theoretical amount of air for combustion of carbon, in accordance with variations in an operating-state quantity of the coal gasifier or variations in a load of the IGCC plant.

Abstract: This IGCC plant is provided with an ASU which separates oxygen gas and nitrogen gas from air, a coal gasification furnace which uses an oxidizing agent to gasify coal, and a gas turbine which is driven by the combustion gas resulting from burning a gas generated by means of the coal gasification furnace. This IGCC plant control device (50) is provided with an air separation amount determination unit (52) which determines the production amount of nitrogen gas produced by the ASU depending on the operating load of the IGCC plant, and supplies to the coal gasification furnace the entire amount of oxygen gas generated as a byproduct in response to the determined nitrogen gas production amount. By this means, the IGCC plant can minimize blow-off of oxygen gas produced from the air.

Abstract: It is intended to provide a fuel gasification system, a control method and a control program for the fuel gasification system, and a fuel gasification combined power generation system provided with the fuel gasification system, whereby even when types and properties of the fuel changes, a calorific value of combustible gas produced by gasification of the fuel is stable while increase or decrease in the amount of char generation is suppressed. A control device (26) of a fuel gasification system (12) controls, depending on an indicator corresponding to the calorific value (SG calorific value) of the combustible gas, the supply of the fuel to a gasification furnace (16) and the supply of the oxygen gas to the gasification furnace (16) so as to change a ratio of the supply of the oxygen gas to the supply of the air supplied to the gasification furnace (16).

Abstract: A hydrogen production apparatus which includes: a humidifier (2), which is supplied with a process fluid containing carbon monoxide and mixes the process fluid with steam; a reactor (3), which reacts the humidified process fluid output from the humidifier in the presence of a catalyst, thereby converting the carbon monoxide within the process fluid into carbon dioxide; a first pipe (A) through which high-temperature process fluid flows following reaction in the reactor; a second pipe (B) that supplies makeup water; at least one first heat exchanger (51a, 51b) disposed at one of one or more locations where the first pipe and the second pipe cross each other; and a third pipe (C) that supplies steam generated by heat exchange in the first heat exchanger to other apparatus.

Abstract: The amount of high-temperature steam supplied from external equipment is reduced. Provided is a hydrogen production system (1) including a reactor (3) that allows a humidified process fluid output from a humidifier (2) to react in the presence of a catalyst to transform carbon monoxide in the process fluid into carbon dioxide; a second channel (B) through which the high-temperature process fluid that has reacted in the reactor (3) flows; a circulation channel (C) through which excess water in the humidifier (2) is circulated; and a first heat exchanger (7), disposed at an intersection of the circulation channel (C) and the second channel (B), for heat exchange between the high-temperature process fluid that has reacted in the reactor (3) and the fluid circulated through the circulation channel (C).

Abstract: To provide a condensate flow rate control device and a control method for a power plant which improve responsiveness to frequency fluctuations or requested load changes and can suppress frequency fluctuations with precision or improve precision with which output power conforms to requested load instructions. A power plant to which a condensate flow rate control device is adapted includes a deaerator to which condensate generated by a condenser is supplied via a deaerator water level adjustment valve and into which bleed steam from a steam turbine is introduced. The condensate flow rate control device has a water level adjustment unit for executing condensate flow rate control, wherein the water level adjustment unit adjusts pressure in a condensate flow path extending from the deaerator water level adjustment valve to the deaerator so that inputted frequency fluctuations are suppressed or an output value of a generator conforms to inputted requested load changes.

Abstract: A hydrogen production apparatus (1) which, in order to improve power generation efficiency, comprises: a humidifier (2), which is supplied with a process fluid containing carbon monoxide and mixes the process fluid with steam; a reactor (3), which reacts the humidified process fluid output from the humidifier (2) in the presence of a catalyst, thereby converting the carbon monoxide within the process fluid into carbon dioxide; a first pipe (A) through which the high-temperature process fluid flows following reaction in the reactor (3); a second pipe (B) that supplies makeup water; at least one first heat exchanger (51a, 51b), each of which is disposed at one of one or more locations where the first pipe (A) and the second pipe (B) cross each other; and a third pipe (C) that supplies the steam generated by heat exchange in the first heat exchanger (51a, 51b) to other apparatus.

Abstract: The amount of high-temperature steam supplied from external equipment is reduced. Provided is a hydrogen production system (1) including a reactor (3) that allows a humidified process fluid output from a humidifier (2) to react in the presence of a catalyst to transform carbon monoxide in the process fluid into carbon dioxide; a second channel (B) through which the high-temperature process fluid that has reacted in the reactor (3) flows; a circulation channel (C) through which excess water in the humidifier (2) is circulated; and a first heat exchanger (7), disposed at an intersection of the circulation channel (C) and the second channel (B), for heat exchange between the high-temperature process fluid that has reacted in the reactor (3) and the fluid circulated through the circulation channel (C).

Abstract: There is provided a control device of a coal pulverizer which enables estimation of a coal output with a precision suited for a purpose. In a control device of a coal pulverizer which pulverizes coal by the coal pulverizer and estimates coal output by which the pulverized coal is output to a boiler, the control device includes a main operation circuit which calculates a command signal associated with a coal feed rate on the basis of detection data from a boiler or a power generator connected to the boiler, and an additional control unit which calculates the deviation between a standard coal output pattern preset in the coal pulverizer, and a current coal output pattern, and adds a calculation result by the additional control unit to the main operation circuit as a correction signal.

Abstract: An axis seal device is provided between a vessel filled with a first gas of a first gas pressure and a rotation axis passing through the vessel. The axis seal device includes first to third dry gas seal sections. The first dry gas seal section is provided such that the rotation axis is rotatable, and has a first space section with a second gas pressure. The second dry gas seal section is provided subsequently to the first dry gas seal section such that the rotation axis is rotatable, and has a second space section with a third gas pressure. The third dry gas seal section is provided subsequently to the second dry gas seal section such that the rotation axis is rotatable, and has a third space section with a fourth gas pressure. The first gas pressure is lower than the second gas pressure, the second gas pressure is higher than the third gas pressure, the third gas pressure is higher than the fourth gas pressure and an atmospheric pressure, and the fourth gas pressure is lower than the atmospheric pressure.