tailieunhanh - Dust Explosions in the Process Industries Second Edition phần 4

Các phương tiện phòng ngừa một lần nữa có thể được chia trong việc phòng chống loại hai của các nguồn phát lửa và phòng chống của điện toán đám mây explosible / cháy. Một vấn đề trung tâm là liệu chỉ ngăn chặn đánh lửa Trong trường hợp này, các điều kiện để tuyên truyền ngọn lửa tự duy trì sẽ là: | Case histories 189 TRACING OF MEASURED OSCILLATORY AMPLITUDE-MODULATED SEISMIC SIGNAL OF A SERIES OF EXPLOSION IMPACTS TIME AFTER ONSET OF FIRST EXPLOSION s POSTULATED SEQUENCE AND RELATIVE STRENGTHS OF NINE EXPLOSION IMPACT ENERGY PULSES STRENGTHS OF NINE EXPLOSION IMPACT ENERGY PULSES I 8 . X 9 OSCILLATORY AMPLITUDE-MODULATED SEISMIC SIGNAL COMPUTED FROM POSTULATED SEQUENCE OF NINE IMPACT ENERGY PULSES POSTULATED SEQUENCE OF NINE IMPACT ENERGY PULSES Figure Sequence of nine impact energy pulses from nine successive explosions in the Harbin Linen Textile Plant Harbin p. R. China 15th March 1987 postulated on the basis of a seismic record of the event From Xu Bowen et al. 1988 ì 90 Dust Explosions in the Process Industries EXPLOSION INITIATION AND DEVELOPMENT SCENARIO 2 This alternative scenario originates from the investigation of Zhu Hailin 1988 who found evidence of an initial smouldering dust fire caused by a live 40 w electrical portable light lamp lying in a flax dust layer of 6-8 cm thickness in a ventilation room. He also found evidence of flame propagation through the underground tunnels for the dust collection ducting. On the basis of his analysis Zhu suggested that the explosion was initiated in the eastern dust collectors 5 in Figure from which it transmitted to nine units of the central dust collecting plant 1 and 2 in Figure 2. 24 via the ducting in the underground tunnels. Severe room explosions were initiated when the ducting in the tunnel ruptured and the resulting blast dispersed large quantities of dust in the workrooms into explosible clouds that were subsequently ignited. From the eastern dust collectors the explosion also propagated into the underground flax stores. It is not unlikely that even this scenario could be developed further in such a way as to agree with the evidence from the seismic recording. ADDITIONAL REMARK The investigation of the Harbin disaster exposed the great difficulties in identifying the exact .

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