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渦街參數設置:渦街式的蒸汽計量表,有根據參數自動計算蒸汽所處的狀態,並進行結算,有的需要人工設定,由於所處的狀態不同,對一個渦街表來說,計算的數據是有誤差的。比如蒸汽參數為壓力1.1 MPa,溫度250度,顯然為過熱蒸汽,對應的密度為4.746,如果設定的是飽和蒸汽,而對應的飽和溫度為183度,密度為6.131,按飽和蒸汽計量的數比過熱蒸汽計量的數多出29%,這個數在用戶看來可能覺得不可思議,但在實際情況中是存在的,在用戶不了解的情況下,有的供熱企業還在這樣做,損害著消費者的利益。
在現在的計量中,特別是夏季用戶減少的情況下,由於管道輸送的距離較遠,許多地方的蒸汽處於非飽和蒸汽狀態,而現在的儀表沒有對非飽和蒸汽的狀態去區分,按照飽和蒸汽去結算,對用戶來說也是不合理的,但現在還沒有比較好的解決辦法。
渦街流量計的選型與安裝:
在的蒸汽參數下,渦街流量計每個口徑有對應的計量流量,超出範圍就會造成的誤差,儀表選的過大或過小都不合適,筆者對內部儀表的選項就做調查過,以前表的選型過大,小流量就不走表,後來表選項小了,但又出現一個問題,用戶利用表的特性,有意加大用汽量,發現超過的流量後,汽表反而顯示流量值反而原來越小了,造成的損失更大,出現這種情況,就要在表前的閥門位置上安裝節流裝置,限制流量來解決。因此,堅持安裝表廠提供的儀表上下限去進行表的選型。
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