【单选题】
脱丁烷塔开车时，应在___投用塔顶冷凝器的冷却水。
A. 开车之前
B. 进料时
C. 投用加热器时
D. 有回流后
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答案
A
解析
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裂解气干燥器切换应具备的条件是___。
A. 备用台裂解气充压完备
B. 备用台裂解气充压结束并稍作流通
C. 备用台裂解气流通充分,其出口温度15℃左右
D. 备用台与运行台压力相同即可切换
【单选题】
碳二加氢后干燥器被切换下来后，向（）系统或（）系统泄压，压力泄至小于___MPa。
A. 燃料气，冷排放，0.5
B. 火炬，冷排放，0.5
C. 燃料气，压缩机，0.3
D. 燃料气，冷排放，0.3
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