Abstract: A plant evaluation apparatus includes: a first computation unit configured to compute a first estimated value of a plant state quantity by using a steady-state model; a first determination unit configured to compute a second estimated value of the plant state quantity by assigning an equipment parameter in a normal state to an equipment parameter of a non-steady-state model; a second computation unit configured to compute a third estimated value of the plant state quantity by using the steady-state model in a case where the first determination unit determines that an error between the second estimated value and an actually measured value is equal to or more than a threshold value; and a second determination unit configured to determine whether or not a difference between the equipment parameter in the normal state and the equipment parameter in an abnormal state is equal to or more than a predetermined value.

Abstract: In order to reduce the calculation cost of industrial plant evaluation, an industrial plant evaluation device 5 comprises: a reception unit 51 configured to receive an actual machine manipulated variable in process control of an industrial plant and an actual machine process variable to be controlled by the process control; an estimation unit 52 configured to determine a process variable as an estimated process variable by using a process model defining a mathematical relationship between a manipulated variable and a process variable in the process control, the process variable as the estimated process variable being obtained by substituting the actual machine manipulated variable for the manipulated variable in the process model; and a comparison unit 53 configured to compare the estimated process variable and the actual machine process variable with each other.

Abstract: A plant-monitoring system includes: at least three detection elements, the detection elements being at least one type of detection element for monitoring a subject being monitored; a detection network configured by disposing the at least three detection elements in a plant; a storage unit that receives detection data from each of the detection elements to record the detection data as recorded data; and a processing computing unit. The processing computing unit receives the detection data from each of the detection elements, determines presence or absence of a fault by comparing the detection data with the recorded data, and in a case where occurrence of a fault is recognized, identifies a place of occurrence of the fault based on the detection data, and transmits the result of the place of occurrence of the fault to a predetermined incident response team.

Abstract: A plant-monitoring system includes: at least three detection elements, the detection elements being at least one type of detection element for monitoring a subject being monitored; a detection network configured by disposing the at least three detection elements in a plant; a storage unit that receives detection data from each of the detection elements to record the detection data as recorded data; and a processing computing unit. The processing computing unit receives the detection data from each of the detection elements, determines presence or absence of a fault by comparing the detection data with the recorded data, and in a case where occurrence of a fault is recognized, identifies a place of occurrence of the fault based on the detection data, and transmits the result of the place of occurrence of the fault to a predetermined incident response team.

Abstract: A plant evaluation apparatus includes: a first computation unit configured to compute a first estimated value of a plant state quantity by using a steady-state model; a first determination unit configured to compute a second estimated value of the plant state quantity by assigning an equipment parameter in a normal state to an equipment parameter of a non-steady-state model; a second computation unit configured to compute a third estimated value of the plant state quantity by using the steady-state model in a case where the first determination unit determines that an error between the second estimated value and an actually measured value is equal to or more than a threshold value; and a second determination unit configured to determine whether or not a difference between the equipment parameter in the normal state and the equipment parameter in an abnormal state is equal to or more than a predetermined value.

Abstract: A plant-monitoring system includes: at least three detection elements, the detection elements being at least one type of detection element for monitoring a subject being monitored; a detection network configured by disposing the at least three detection elements in a plant; a storage unit that receives detection data from each of the detection elements to record the detection data as recorded data; and a processing computing unit. The processing computing unit receives the detection data from each of the detection elements, determines presence or absence of a fault by comparing the detection data with the recorded data, and in a case where occurrence of a fault is recognized, identifies a place of occurrence of the fault based on the detection data, and transmits the result of the place of occurrence of the fault to a predetermined incident response team.

Abstract: In order to reduce the calculation cost of industrial plant evaluation, an industrial plant evaluation device 5 comprises: a reception unit 51 configured to receive an actual machine manipulated variable in process control of an industrial plant and an actual machine process variable to be controlled by the process control; an estimation unit 52 configured to determine a process variable as an estimated process variable by using a process model defining a mathematical relationship between a manipulated variable and a process variable in the process control, the process variable as the estimated process variable being obtained by substituting the actual machine manipulated variable for the manipulated variable in the process model; and a comparison unit 53 configured to compare the estimated process variable and the actual machine process variable with each other.

Abstract: A target treatment volume for exhaust gas to be treated is specified based on the product of an actual flow rate of exhaust gas discharged toward a CO2 recovery device, and an exhaust gas treatment rate RG1, and a target recovery volume for CO2 to be recovered by the recovery device is specified based on the product of an actual volume of CO2 contained in the exhaust gas discharged from the generation source of the exhaust gas, the exhaust gas treatment rate RG1, and a CO2 recovery rate RCO2. RG1=TCO2/VG1 VG1: Flow rate of exhaust gas discharged from generation source of exhaust gas TCO2: Volume of exhaust gas to be treated by recovery device RCO2=CCO2/VCO2 VCO2: Volume of CO2 contained in exhaust gas to be treated by recovery device CCO2: Volume of CO2 to be recovered by recovery device.

Abstract: In a steam system having a turbine driven by steam supplied from a high-pressure header to a low-pressure header, when the pressure in the low-pressure header drops, a turbine bypass valve is opened and the high-pressure side steam is supplied to the low-pressure side header in a normal control. When the turbine is tripped, steam is rapidly flow into the low-pressure side header and its pressure temporally increases. the steam in the low-pressure header is discharged through a discharge valve. After that, if a steam supply from the low-pressure header to another process increases, the discharge valve is closed. After the discharge valve is fully closed, an after-trip control is performed in which the opening of the turbine bypass valve is increased at an earlier timing than the normal control for preventing the steam amount in the low-pressure header to be too small. The control stability of the steam system when the turbine is tripped can be enhanced.

Abstract: A steam system control method applied to a steam system including: a low-pressure header storing low-pressure steam; a high-pressure header storing high-pressure header; a steam turbine connected between them; and a turbine bypass line introducing controlled amount of steam from the high-pressure header to the low-pressure header by bypassing the steam turbine. The low-pressure header has a blow-off valve for discharging excessive steam to the outside. The steam system control method includes: a normal time blow-off valve control step of PI controlling the opening of the blow-off valve; and a trip time blow-off control step of controlling the opening of the blow-off valve by changing the MV value to a predetermined trip time opening set value when the turbine is tripped.

Abstract: A turbine bypass control method includes: a high-pressure side pressure controller configured to output a first operation amount signal corresponding to a valve opening; a low-pressure side pressure controller configured to output a second operation amount signal corresponding to a valve opening; a high value selector configured to output as a high value operation amount signal, one of the first operation amount signal and the second operation amount signal which indicates a larger opening; a first signal switching unit configured to receive the high value operation amount signal and the second operation amount signal and output a first bypass valve operation amount signal; a second signal switching unit configured to receive the high value operation amount signal and the first operation amount signal and output a second bypass valve operation amount signal; and a rapid opening controller.

Abstract: A steam system control method applied to a steam system including: a low-pressure header storing low-pressure steam; a high-pressure header storing high-pressure header; a steam turbine connected between them; and a turbine bypass line introducing controlled amount of steam from the high-pressure header to the low-pressure header by bypassing the steam turbine. The low-pressure header has a blow-off valve for discharging excessive steam to the outside. The steam system control method includes: a normal time blow-off valve control step of PI controlling the opening of the blow-off valve; and a trip time blow-off control step of controlling the opening of the blow-off valve by changing the MV value to a predetermined trip time opening set value when the turbine is tripped.

Abstract: In a steam system having a turbine driven by steam supplied from a high-pressure header to a low-pressure header, when the pressure in the low-pressure header drops, a turbine bypass valve is opened and the high-pressure side steam is supplied to the low-pressure side header in a normal control. When the turbine is tripped, steam is rapidly flow into the low-pressure side header and its pressure temporally increases. the steam in the low-pressure header is discharged through a discharge valve. After that, if a steam supply from the low-pressure header to another process increases, the discharge valve is closed. After the discharge valve is fully closed, an after-trip control is performed in which the opening of the turbine bypass valve is increased at an earlier timing than the normal control for preventing the steam amount in the low-pressure header to be too small. The control stability of the steam system when the turbine is tripped can be enhanced.

Abstract: A turbine bypass control method includes: a high-pressure side pressure controller configured to output a first operation amount signal corresponding to a valve opening; a low-pressure side pressure controller configured to output a second operation amount signal corresponding to a valve opening; a high value selector configured to output as a high value operation amount signal, one of the first operation amount signal and the second operation amount signal which indicates a larger opening; a first signal switching unit configured to receive the high value operation amount signal and the second operation amount signal and output a first bypass valve operation amount signal; a second signal switching unit configured to receive the high value operation amount signal and the first operation amount signal and output a second bypass valve operation amount signal; and a rapid opening controller.

Abstract: A fuel cell power generation system, equipped with a fuel reforming device and a fuel cell body, includes valves, pipelines, a condenser, and a pump for feeding a burner exhaust gas (raw gas) discharged from a heating burner of the fuel reforming device into the fuel reforming device, and an inert gas formation device including an oxidizable and reducible oxygen adsorbent, which is disposed in the pipelines, and adsorbs oxygen in the burner exhaust gas to remove oxygen from the burner exhaust gas and form an inert gas. The fuel cell power generation system can reliably remove residual matter, without leaving it within the fuel reforming device, in a simple manner at a low cost and with a compact configuration.

Abstract: A fuel cell power generation system, equipped with a fuel reforming device (60) and a fuel cell body (4), includes valves (30a, 32), pipelines (30b, 31), a condenser (34), a pump (35), etc. for feeding a burner exhaust gas (25) (raw gas) discharged from a heating burner (10) of the fuel reforming device (60) into the fuel reforming device (60), and an inert gas formation device (5A) including an oxidizable and reducible oxygen adsorbent (28), which is disposed in the pipelines (30b, 31), and adsorbs oxygen in the burner exhaust gas (25) to remove oxygen from the burner exhaust gas (25) and form an inert gas (40). The fuel cell power generation system can reliably remove residual matter, without leaving it within the fuel reforming device (60), in a simple manner at a low cost and with a compact configuration.

Abstract: Assuming that the processes of joining, rolling, coiling, etc. of a material is evaluated by a preset speed pattern after the extraction from a heating furnace, the required time is predicted and calculated for both of a preceding material and a following material. At the time when the following material can catch up with the preceding material at an aiming position on the line, the following material is extracted from the heating furnace according to the result of the above prediction calculation. Control is carried out so that both of the preceding material and the following material finish the process at a preset speed. Also, the traveling speed of the following material is controlled according to the position and the speed of the tail edge of the preceding material in a section close to the catch-up position so that a distance between the tail edge of the preceding material and the leading edge of the following material be closed.