事故源强分析

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1、事故源强分析1.2.1小孔泄漏此种情况通常为物料经较小的孔洞长时间持续泄漏,如反应器、储罐、管道上出现小孔，或者是阀门、法兰、机泵、转动设备等处密封失效而引起的泄漏。在硫酸生产装置中因小孔泄漏而引起的S02污染事故,SO2泄漏量选用气体经小孔泄漏的源模式来预测。气体小孔泄漏源模式:临界压力Pc为:当大气压力p

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4、：U…泄漏气体的流速,m/s;Unix…泄漏气体的最大流量,m/s;Q…泄漏气体的流量,kg/s；Qmax…■泄漏气体的最大流量，kg/s；Co…孔流系数，修圆小孔取1,薄壁小

5、孔当雷诺数Re>105时取0.61；P。…泄漏气体的压力，Pa；A…泄漏小孔而积，m3Y…绝热指数；R…理想气体常数，8・314J.moPKi；M…气体摩尔质量，kg/mol；T—温度，Ko硫酸装置屮SO2风机后处于正压状态的管道、反应器、换热器等操作单元的发生小孔泄漏的具体情况见表7-lo该生产装置中工况参数相同的部位发生泄漏，SO2、SO3最大泄漏质量流量相同。表7-1硫酸装置SO?经小孔泄漏的最大质量流量操作单元位置主要操作单元工况参数泄漏SO2的最人质量流量g/sS02浓度气压温度临界压力小孔而积3mg/m'KPa°

6、CPa0.2cm20.4cm20.6cm2O&m?1cm22cm23cm24cm25cm2鼓风机出口309257.8392.5402073502.8255.651&47611.30214.12728.25542.38256.51070.637催化转化塔I段进口309257.80392.54352073501.8793.7575.6367.5159.3931&78728.18037.57346.967I段出口154629392.5591.52073500.8501.7002.5503.4004.2508.50112.75117

7、.00121.252II段进口154629392.54452073500.9331.8662.7983.7314.6649.32813.99118.65523.319II段出口25773283.2499.71496090.1080.2160.3240.4330.5411.0811.6222.1632.703III段进口25773247.04351304850.0990.1970.2960.3940.4930.9851.4781.9712.463III段出口1312247.0464.81304850.0050.0100.015

8、0.0200.0250.0490.0740.0980.123IV段进口1312247.04251304850.0050.0100.0150.0200.0250.0510.0760.1010.126IV段出口703232.04261225610.0030.0050.0080.0100.0130.025().0380.0510.064一吸塔进口21772177.2180936110.0740.1490.2230.2970.3720.7441.1151.4871.85921772138.2170730080.0530.1060.1

9、600.2130.2660.5320.7981.0651.331二吸塔进口703138.2170730080.0020.0030.0050.0070.0090.0170.0260.0340.043川11703102.080538840.5550.0010.0010.0010.0020.0030.0050.0060.008