Dissertation
Dissertation > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyolefin plastic > Polyethylene

LDPE degassing silo safety analysis and safety measures

Author SunHaiTao
Tutor YaoFangLian;DiaoChunSen
School Tianjin University
Course Chemical Engineering
Keywords High-pressure polyethylene Degassing Silo Safety CFD simulation
CLC TQ325.12
Type Master's thesis
Year 2009
Downloads 42
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Tubular process LDPE plant with high pressure levels , controlled chain complex systems , process equipment demanding characteristics, therefore in the production process there is a higher risk . Which degassing silo after due granulated polyethylene particles due to the silo wall with static electricity generated by friction and the presence of flammable gas ethylene , can easily lead to an explosion , there is a huge potential security risks . Therefore, the safe operation of high-pressure polyethylene hopper has become the focus of high-pressure device security management . In this paper, polyethylene hopper flash explosion accident occurred prerequisite silo ethylene concentration and electrostatic factors on the risk of high-pressure polyethylene hopper made ??cause analysis, and the use of analysis of the conclusions on the causes of Qilu Petrochemical plastic Factory silo cause of the accident occurring to do a detailed analysis and summary. Based on the analysis in the genesis proposed for degassing system transformation strategies, including ways to improve ventilation and degassing of the four programs fan motor , fan inlet filter , silo unloading valve reconstruction of specific programs. Meanwhile, the proposed improvements for the operation and accident fighting measures . At the same time , the use of CFD software for the proposed rehabilitation programs degassing system ventilation simulation studies were made ??, and the simulation results are analyzed and evaluated to determine the optimal solution . Based on simulation results, the final screening out the best solution for the transformation of the bottom 1.7 meters away from the position at the position to increase Road outlet . Preferred solution to be implemented in production , according to the transformation before and after comparison , found ethylene content decreased significantly, greatly improved the safety of the silo that through CFD simulations , for the transformation of plant screening program has a strong guiding significance. Finally, based on the actual production of the transformation results degassing positions , combined with CFD simulation research, the protection of the silo safety guidelines. Guidelines for the domestic and international pressure polyethylene production safety device also has an important guiding significance.

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