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涡街参数设置:涡街式的蒸汽计量表,有根据参数自动计算蒸汽所处的状态,并进行结算,有的需要人工设定,由于所处的状态不同,对一个涡街表来说,计算的数据是有误差的。比如蒸汽参数为压力1.1 MPa,温度250度,显然为过热蒸汽,对应的密度为4.746,如果设定的是饱和蒸汽,而对应的饱和温度为183度,密度为6.131,按饱和蒸汽计量的数比过热蒸汽计量的数多出29%,这个数在用户看来可能觉得不可思议,但在实际情况中是存在的,在用户不了解的情况下,有的供热企业还在这样做,损害着消费者的利益。
在现在的计量中,特别是夏季用户减少的情况下,由于管道输送的距离较远,许多地方的蒸汽处于非饱和蒸汽状态,而现在的仪表没有对非饱和蒸汽的状态去区分,按照饱和蒸汽去结算,对用户来说也是不合理的,但现在还没有比较好的解决办法。
涡街流量计的选型与安装:
在的蒸汽参数下,涡街流量计每个口径有对应的计量流量,超出范围就会造成的误差,仪表选的过大或过小都不合适,笔者对内部仪表的选项就做调查过,以前表的选型过大,小流量就不走表,后来表选项小了,但又出现一个问题,用户利用表的特性,有意加大用汽量,发现超过的流量后,汽表反而显示流量值反而原来越小了,造成的损失更大,出现这种情况,就要在表前的阀门位置上安装节流装置,限制流量来解决。因此,坚持安装表厂提供的仪表上下限去进行表的选型。
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