Study On The Failure And Regeneration Technology Of Explosion Suppression Material For Explosion Gas In Petrochemical Industry

The aluminum alloy explosion suppression materials are widely used in the petrochemical industry for preventing the explosion of explosive gas. The experiments respectively studied the status of materials in long term service and the effects of deposition and scaling reduced the explosion suppression performance. Both washing regeneration technology and explosion suppression performance evaluation technology of materials have been studied. The main completed work is as follows:1. The depositing and scaling situations of materials for a long term service in a number of petrochemical enterprises have been studied. The situations included three aspects, which were the scaling situation of material in different storage tanks, the scaling situation of material at different locations in the same tank and the scaling situation of the explosion suppression material itself. The scaling situation and laws of material have been revealed through the research and analysis.2. The chemical analysis was carried out for the dirts which were on the surface of the materials used for more than five years. The results showed that the soluble fraction mainly included alkanes. In addition, it contained a variety of other compounds, such as oxygen containing compounds, sulfonate containing compounds and nitrogen-containing compounds. The insoluble organic content carbon, hydrogen, nitrogen, sulfur element respectively reached 15.86%, 4.38%, 1.64%, 1.18%. Thermal analyzer results explained the total content of organic matter was 35.3%. The water soluble anion in the dirt contained F^-, Cl^-, NO₃^-, SO₄^2- and the concentration of SO42- was the highest. The dirts contained a variety of metal elements, the contents of Fe3+, Al3+, Ca2+ were more than others. All results were discussed and the cause of dirts formation was analyzed3. New ultrasonic cleaning technology of material was developed, at the same time, the special cleaning agent A was developed for the fouling components and the chemical mechanism of cleaning agent was analyzed. Experimental results show that the best cleaning frequency was 25 k Hz, the best power was 3k W and the best concentration of cleaning agent A was 2%. In addition, tensile strength test of the new material and the abluent materials showed that their tensile strength maintained at about 270 MPa, their tensile properties of the materials had no change. The metallographic structure of the new materials and the abluent materials showed that the sizes and numbers of the aluminum alloy crystalline grain did not change, it proved that the alloy structure wasn’t damaged.4. The explosion suppression performance of the various materials was analyzed by using high speed video camera. Its results revealed that the effect of the new material and the abluent material for preventing the flame was better than that of the used materials which was not cleaned. With filling the abluent materials or new materials, the methane/air mixture explosion propagation speed was decreased to 1/3 of that with filling the used materials and it could be decreased to 1/6 of that without materials. The explosion suppression mechanism of materials was discussed and analyzed through the experimental data.5. The explosion suppression performances of new materials, used materials and the abluent materials are tested respectively in the closed pipeline and the patent device by petroleum and chemical combustion gases as medium. It showed that the failure of explosion suppression performance was very obvious, which caused by the scaling of materials. The failure problems of materials in the heavy oil, such as diesel, was more serious than that in the light oil, such as gasoline. The explosion suppression performances of used materials can be recovered by the self-developed cleaning technology.