|
Statistical analysis, dust explosion accidents have occurred from the number of occurrences Judging from the number of casualties caused by need to give priority to and tightly controlled powder material: metal powder, agro-processing powders, organic chemicals, synthetic powder, fiber powder, inorganic powder, coal, and so on. Summed up the three effects of dust explosion factors, and the establishment of a dust explosion, the 7 modes. Order to more accurately understand the risk of dust from two points of view, the risk of dust Rating: comprehensive analysis of the fault tree analysis and fuzzy. The former the dust causes of the explosion on the macro-analysis, which is the analysis of the dust risk of micro. The use of fault tree analysis of the hidden factors including human factors, including organic combination of job environment for dust, use of minimal path sets and minimal cut sets two logic operation methods of dust system with fault tree analysis The cause of the accident analysis, the cause exploded 10 mainly due to: the powder particle size, design defects, dust cleaning is not timely, misuse, equipment failure, the oxidizing leak, the unused gas monitoring and alarm apparatus, awareness not use the inerting the inerting gas leakage. Understanding of microscopic dust Explosion hazard considering the characterization of dust blasting characteristics such as the median particle size, the lower explosion limit concentration, ignition temperature (dust clouds, dust layer), minimum ignition energy, the maximum explosion pressure, seven parameters of the maximum rate of pressure rise, and the use of fuzzy mathematical principles to compare the risk of 12 kinds of dust, to identify different confidence blasting the type of dust, but also calculated the 11 on which the dust most dangerous dust (aluminum powder) close degree. In this process, the use of AHP to determine the weight of seven kinds of blasting characteristic parameters; mathematical treatment of the use of engineering data to speed up the computing speed, to ensure the reliability of the results. The results of the assessment for understanding the dust provides important safety basis. Standard (GB) GG furnace design sketch analysis, simplified test apparatus designed dust lowest ignition temperature (MIT, minimum ignition temperature), and the establishment of a corresponding test, the control system. Taking into account the heat dissipation characteristics of the both ends of the tube, in both ends of the pad 4mm asbestos board, and the heating wire wound around the outer quartz tube, the outer wall of the corundum, and reduce the difficulty of processing, can also meet the flexible control of the temperature.
|