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Research on Erosion Mechanism and Simulation Forecast Technology for Gas-liquid-solid Pipeline Flow in Coal Chemical Processing

Author: BaoJinZhe
Tutor: OuGuoFu
School: Zhejiang University of Technology
Course: Fluid Machinery and Engineering
Keywords: Coal-to- oil The gas-liquid solid multiphase flow Abrasion mechanism Abrasive forecast Engineering applications
CLC: TG172
Type: Master's thesis
Year: 2010
Downloads: 170
Quote: 0
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Abstract

Increasingly scarce as the International Energy coal chemical industry in the country, the rapid development of abrasion of equipment and piping containing solid multiphase flow easily lead to a serious accident, and has always been plagued by safety and production. Harsh abrasion mechanism is very complex, related equipment and operating conditions of the pipeline, it is difficult to accurately grasp the specific location of the failure. Multi-engineering to enhance the material, thickened wall to prevent abrasive perforation, greatly increased the cost of production, but the effect is not obvious, abrasion failure have not been effectively controlled. Typical gas-liquid-solid multiphase flow abrasive case to the high-temperature and high-pressure separator piping systems for coal-to-oil hydrogenation reactor to study the coupling mechanism for corrosion and wear; based on geometric modeling of multiphase flow piping system turbulence model and flow Wear mathematical modeling, multiphase flow model and the discrete phase model and solve the multi-phase flow field, relative wear rate on the distribution of liquid and solid particles in the pipe and pipe wall, and to determine the entire pipeline danger zone thinning leak; through comparative analysis of the different characteristics of the pipeline structure and solid particles, to investigate the influence of various factors on the pipeline erosion wear, the results show that in the case of other conditions remain unchanged, the wear rate of the pipeline with the inner diameter increases, the optimum radius of curvature of the pipeline is determined according to the actual situation, solid particles, the closer the spherical wear smaller the particle size the greater the greater the wear, but when a large particle size to a certain extent, the wear rate increases as the particle particle size did not change significantly; structural optimization design and computational analysis of the existing pipeline system, so that the wear rate of the new structure reduced by nearly 60%, the optimization effect is obvious. Inspection and distribution, can significantly reduce the workload of the in-service inspection, and to ensure the safety of the entire pipeline system serving piping systems according to the abrasive prediction method. The innovation of this dissertation is: coal liquefaction process typical gas-liquid-solid multiphase flow pipeline system as the research object, starting from the coupling mechanism of corrosion and wear, considering the liquid phase fraction and solid particles wear two factors, fluid dynamics method to forecast abrasion failure of problems; single condition to change the law, pipe flow wear investigated; predicted results and wear rules applied to the pipeline structure optimization and distribution of in-service inspection program for in-depth study of coal liquefaction equipment and pipeline security, stability, and long period operation has laid a good foundation for the theory. Further deepen the study on the basis of the research paper is expected to promote applied to chemical companies on behalf of the coal chemical containing abrasive solid multiphase flow equipment and piping systems failure analysis, structural optimization, local strengthening treatment, in-service detection and location, life prediction, risk assessment, security engineering, economic and social benefits are significant.

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