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一、概述: 我厂减压塔顶冷凝冷却系统采用管壳式冷却器,间接冷却。共有六台浮头式冷却器,六台蒸汽喷射泵。其中减顶抽空冷凝器三台(冷006/1、2、3),在这三台冷凝器之前原有二台大型蒸汽喷射泵,因实际操作中对提高真空度作用不大,几乎没有使用过,于七○年十月拆除。一级抽空冷凝器二台(冷007/1、2),有四台蒸汽喷射泵分二头进入冷007,二级抽空冷凝器一台(冷008),二台蒸汽喷射泵分二头进入。操作工艺参数见表～1。根据冷凝水分析,该处的腐蚀类型均属H_2S—HCL—H_2O腐蚀,但冷006、007、008的腐蚀程度有所不同。在未采取防腐措施前,其腐蚀速度与常压空冷器一样,特别是007、008仅使用170天左右全部换新。随着防腐措施逐步完善,腐蚀速度有所减缓,但不如常压低温轻油部位效果明显,腐蚀速度仍在1毫米/年左右,有时冷凝水颜色变黑,
First, an overview: Our vacuum tower condensation cooling system using shell and tube cooler, indirect cooling. There are six floating-head coolers and six steam jet pumps. Among them, three vacuum condensers (cold 006/1, 2/3) were dedipped, and two large steam jet pumps were used before the three condensers. Since the actual operation has little effect on increasing the vacuum, almost no use is made It was dismantled in October 1970. The first stage of the two empty condenser (cold 007 / 1,2), there are four steam jet pump into two cold 007, two emptying condenser (cold 008), two steam jet pump into two . Operating process parameters in Table ~ 1. According to the analysis of condensate water, the type of corrosion there is H 2 S-HCL-H 2 O corrosion, but the degree of corrosion of cold 006,007,008 is different. Corrosion rates are the same as for the atmospheric air coolers before taking anticorrosive measures, especially for the 007,008, which is used for about 170 days only. With the gradual improvement of anti-corrosion measures, the corrosion rate has slowed down, but not as good as atmospheric pressure light oil site obvious effect, the corrosion rate is still 1 mm / year, and sometimes condensate color black,