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我厂4万吨聚丙烯装置聚合干燥工段所用的循环压缩机压力0.14/2.3MPa;排气量588m~3/h功率120kw.该压缩机由瑞士进口,总价值人民币1190万元,一件缸体约为人民币30万元.1996年元月,该压缩机一段缸体冻裂.经分析原因如下:(1)在突停循环水后,缸体内冷却水套积水没有排净.(2)气温由-3℃骤降至-12℃.(3)装置处于停工期间,由于缸体内积水结冰,冷却水套外壳冻裂.裂纹总长1115mm,缸壁厚度24mm,缸体材料为铸铁,已裂透,裂纹呈“b”型.其中一块完全脱落.
I plant 40,000 tons polypropylene plant polymerization drying section used in circulating compressor pressure 0.14 / 2.3MPa; displacement of 588m ~ 3 / h power 120kw. The compressor imported from Switzerland, with a total value of 11.9 million yuan, a cylinder The body is about RMB 300,000 yuan. January 1996, the compressor block of the first crack. Analysis of the reasons are as follows: (1) Sudden stop circulating water, the water jacket cooling water jacket is not clean. 2) The temperature drops sharply from -3 ℃ to -12 ℃. (3) During the shutdown of the unit, due to the freezing of water in the cylinder body, the shell of the cooling water jacket will be cracked. The length of the crack is 1115mm, the thickness of the cylinder wall is 24mm, For cast iron, cracked, cracked “b” type. One of them completely off.