| 摘要 |
A regulating method for preventing surges in a turbocompressor by initiating blow-off when necessary during operation. Flow to the turbocompressor and the compressor outlet pressure are measured continuously, and a first regulating difference is calculated from these measurements. This first regulating difference is then applied as an input parameter to a regulator which has a limited response rate. The output of this regulator is then used as a regulating parameter for a blow-off valve. The blow-off valve is opened rapidly by safety controls under malfunctioning conditions that tend to stress the limited response rate of the regulator. A second regulating difference is calculated from the preceding measurements or from the first regulating difference to indicate the need to open rapidly the blow-off valve. The calculation of the second regulating difference is carried out with predetermined reference values, and this calculated second regulating difference is applied to a threshold stage which emits a rapid-opening parameter when the second regulating difference exceeds a predetermined threshold stored in that threshold stage. The rapid-opening parameter is forwarded to the regulator, and an accelerated change in a valve-adjustment parameter is generated in the regulator by additive superposition for activating the valve in the opening direction to protect the turbocompressor against occurrence of pressure surges.
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