Geräuschdämmung und Aufrechterhaltung einer dichten Abdichtung Ihres Systems zum Ablassen in die Atmosphäre.
Stellventile in einem Kraftwerk mit einem Entlüftungssystem mit Ablass in die Atmosphäre leiten Dampf um die Turbine herum in die Atmosphäre ab. So wird sichergestellt, dass sich die Einheit nicht zu schnell erhitzt. Entlüftungsventile für den Ablass in die Atmosphäre sind für die Betriebseffizienz von entscheidender Bedeutung, da sie während des Ablassbetriebs leise arbeiten und während des normalen Betriebs einen dichten Abschluss bieten und so das Entweichen von wertvollem Dampf verhindern. Sie müssen die folgenden Herausforderungen bewältigen:
Sky vent control valves often have failures resulting from damages to the positioner caused by high-temperature radiation and/or piping vibration. Conventional positioners used on these valves also tend to suffer from inaccuracy and failures due to wear and tear of the mechanical linkages. These failures can lead to unplanned downtime and production losses.
Linkage-less, non-contact Fisher FIELDVUE digital valve controllers are paired with Fisher control valves to improve sky vent valve performance and reliability. With no linkage to wear, loosen, corrode, or vibrate, FIELDVUE digital valve controllers can handle harsh environments. A remote mount option is suited for high ambient temperature and/or piping vibration.
In normal operating conditions, sky vent valves will remain closed most of the time. They are required to provide tight shutoff during normal operation and prevent any valuable steam or process fluid from leaking. It is a challenge for most valve vendors to design long-lasting and good sealing technology to operate at full pressure drop and high-temperature conditions where elastomer seals are not able to withstand.
The Fisher Bore Seal employs a metal C-shaped ring that is secured to the outside diameter of the valve plug. When the valve plug comes into contact with the seat ring to close the valve, the Bore Seal is compressed against the cage wall thereby blocking a secondary leakage path that exists between the plug and cage wall.
Sky vent valves will be in the closed position during normal operation. However, during startup, steam vent valves bypass steam around the turbine to ensure the unit does not come up to temperature too quickly. The large pressure differential across steam vent valves at initial plant startup can cause high noise levels that need to be attenuated. Vibration caused by aerodynamic sound pressure may eventually damage equipment and shorten operating life.
Fisher valve trims accomplish noise attenuation by utilizing unique pressure control of flow through the valve and diffuser or silencer. Fisher Whisper Trim III cages achieve up to a 30 dBA noise reduction.
Fallstudie
Verbessern Sie die Energieeffizienz und minimieren Sie Ihre CO2-Bilanz mit der Fisher Ventillösung für den Ablass in die Atmosphäre.
Fallstudie
Nutzen Sie Ventile, Stellantriebe und Instrumente von Fisher, um Betriebskosten zu senken und die Flexibilität, Verfügbarkeit und Zuverlässigkeit Ihrer Anlage zu optimieren.
