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长输天然气管道部分站场站控室、值班室面向工艺装置区设置,且开设非全密闭式玻璃窗,工艺装置区一旦发生泄漏爆炸将对站控室产生极大危害。在气象条件、运行压力、站控室与工艺区的间距等因素一定的情况下,天然气爆炸事故对站控室的影响取决于泄漏孔径的大小。以某典型运行站场为研究对象,利用SAFETI软件,对不同孔径下的泄漏爆炸事故进行模拟计算,结果表明:管道泄漏孔径小于5 mm的泄漏不会引发爆炸;孔径为29 mm及以下的泄漏爆炸对建筑物影响较小;孔径为71 mm的泄漏发生爆炸时,站控室的门窗及屋顶会严重破坏并可能坍塌;孔径90 mm及以上孔径泄漏发生爆炸时,建筑物可能会发生崩塌甚至倾倒。由此,虽然站控室至工艺装置区的距离满足了规范要求,但是遭受泄漏爆炸冲击波的危害后果仍较严重,建议对已建在用的站控室进行防爆加固,新建的工程项目需要进一步计算确定安全距离。
Long-distance natural gas pipeline station station control room, duty room for the installation of process equipment area, and the opening of non-full-enclosed glass windows, process equipment area in the event of a leak explosion will have a great harm to the station control room. Under the conditions of weather conditions, operating pressure, spacing between station control room and process area, the impact of natural gas explosion on station control room depends on the size of leak aperture. Taking a typical operating station as the research object, the SAFETI software is used to simulate the leakage explosion events with different pore diameters. The results show that the leakage with the leakage diameter less than 5 mm will not lead to the explosion. The leakage with the diameter of 29 mm and below Explosions have less impact on buildings; doors, windows, and roofs of station control rooms can explode and collapse when leaks with a diameter of 71 mm; buildings 90 mm and over in diameter Explosions may collapse or even collapse . As a result, although the distance between the station control room and the process plant area has met the requirements of the code, the consequence of the blast explosion shock wave is still serious. It is suggested that the existing station control room be explosion-proof and reinforced, and the newly-built project needs to be further calculated and determined safe distance.