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蒸汽疏水阀的容量及安全率的相关技术规范
2015-09-05 09:053516


词术语易于混淆+为了使选用者更清楚地了解蒸汽疏水阀并能正确地选用,以下将一些主要名词术语予以说明。
    ①机械型蒸汽疏水阁;由凝结水液位变化驱动的蒸汽疏水闻。
    ②热静力型蒸汽疏水闽;由凝结水温度变化驱动的蒸汽疏水同。
    ③热动力型蒸汽疏水阀:由蒸汽和凝结水动态特性驱动的蒸汽疏水阀。
    @最高允许压力;在给定温度下,蒸汽疏水阀壳体能够持久承受的最高压力。
    ⑤最高工作压力:在正确动作条件下,蒸汽疏水阀进口端的最高压力,由制造厂绐定。
    ⑥工作背压:在工作条件下,蒸汽疏水阀出口端的压力浆液阀。
    ⑦背压率:工作背压与工作压力的百分比。
    ⑧最高允许温度;在给定压力下,蒸汽疏水厢壳体能够持久承受的最高温度。
    ⑨过玲度:凝结水温度与相应压力下饱和温度之差的绝对值。
    ⑩冷凝结水排量:在给定压差和20℃条件下,燕汽疏水闼lh内能排出凝结水的最大重量。
    @热凝结水排量:在绐定压差和温度下,蒸汽疏水阀1h内能排出热凝结水的最大重量。
    @菲汽量:单位时间内蒸汽疏水阀漏出新鲜蒸汽的量。
    @无负荷漏汽量:蒸汽疏水阀处于完全饱和蒸汽条件下的漏汽量。
    @有负荷漏汽量:给定负荷率下,蒸汽疏水闻的漏汽量,
    @无负荷漏汽率:无负荷漏汽量与相应压力下最大热凝结水排量的百分比。
    ⑩有负荷漏汽率:有负荷漏汽置与试验时间内实际热凝结水排量的百分比。
    ⑩负荷卓:试验时间内的实际热凝结水排量与试验压力下最太热凝结水排量的百分比。
    (2)蒸汽疏水阀的容量及安全率
    在选择蒸汽疏水阀时,要充分了解作为使用对象的蒸汽输送管和各种热交换器等蒸汽使用设备的型式和使用目的以及特性等,准确地掌握设备本身的容量,这是先决条件。如果知道了蒸汽使用设备的容量,它所使用的蒸汽疏水阀的容量也就可以确定了。确定蒸汽疏水阀的容量,必须按以下原则求出:
    蒸汽使用设备的容量(凝结水产生量)×安全率:蒸汽疏水阀的容量
    安全牢,即是在确定蒸汽疏水阀容量时,蒸汽使用设备实际的凝结水产生量与所标出容量有误差时也能确保蒸汽疏水闽能正常工作而估计的安全系数。这种安全率既不是单纯从理论上加以规定,无法通过计算求得;也不完全来自经验数据。一般说来,考虑安全率最好的办法是直接询问疏亦阁生产厂家。如果在选用蒸汽疏水闽时,其选用的安全率不当,使蒸汽疏水阀的容量过大或不足。都会产生极不良的后果。
    若安全率过大,即安装使用了容量过大的蒸汽疏水阀时,会产生下列弊端:
    ①蒸汽疏水阁的容量大会增高成本。
    ②若为问歇动作的蒸汽疏水阀时,容量过大会使疏水阀动作周期加长.凝结水的平均滞留量增加,用汽设备的能力降低。
    ③对于像浮球式疏水阉那样连续(按比例)动作的蒸汽疏水阀,由于阔瓣开度小,过大的容量会使阀座产生拉毛现象(高速流体通垃狭窄的缝隙时,对接触面产生腐蚀作用,
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