| 摘要 |
PURPOSE:To make an emergent abnormality processing possible, by performing a restoring operation or a control exception processing accompanied with the change of a control period, a control object, and a control system in accordance with an abnormality, which is generated during the execution of the computer direct control, in the starting operation for a heat power plant. CONSTITUTION:When the constant value control is requested by the operator during the execution of a normal control R2 due to a program 2, the normal control R2 is switched to a control F1 immediately. If the fuel oil pressure becomes high abnormally by the accidental fire of a burner 1 and it is necessary to reduce the fuel oil urgently, a program 2' is started, and a set value control S1 is performed while monitoring the plant at a short period, and the control code of a no-operation N is given to the program 2. When the fuel oil pressure is restored to the normal state, a control end E is given to the program 2' to terminate the periodic operation, and the constant value control F1 is given to the program 2 to start an event. When the boiler temperature becomes a final target value Td of temperature rise, a control completion C is given to the program 2 to start the event. |
