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Examples of valve selection in chemical automation systems
The author: Time:2021/4/26

        对采用调节载热体的流量来保持冷流体的出口温度的换热器,若冷流体温度过高,会发生结焦,分离等现象,严重影响下一工序操作或造成换热器设备损坏,这时应选用气开式;若冷流体在温度降低时易结晶或凝固,清除换热器内的结晶物之困难比温度继续升高给工I艺生产带来的损失影响更大时,应选用气关式。
        对通过调节火源(如烧重油的炉子,调节进油量)控制温度的加热炉,为防止烧毁加热炉,应选用气开式。对塔、罐等容器,若通过排出物料来调节压力时,为防止设备压力升高而损坏,应选用气关式;若通过进料量来调节压力时,应选用气开式。对压缩机的吸入压力控制,为避免抽空,应选用气关式。调节进入设备工艺介质的流量时,若介质为易燃气体,为防止爆炸,应选用气开式;若介质为易结晶物料,为防止堵塞,应选用气关式。

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