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Study on the Hydrodynamics of Novel Multistage Airlift Loop Reactor

Author: LiFei
Tutor: DingFuXin；WangBaoGuo
School: Tsinghua University
Course: Chemical Engineering and Technology
Keywords: Multi-level Loop reactor Hydromechanics General circulation liquid velocity Gas holdup Model
CLC: TQ052
Type: PhD thesis
Year: 2004
Downloads: 559
Quote: 7
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Abstract

With the rapid development of China's national economy, as an important strategic resources of oil, its demand is growing rapidly. Beginning in 1993, the country has become a net importer of oil. Therefore, in order to meet the growing need economic growth, on the one hand, the oil exploration technology to improve oil processing technology, on the other hand needs to be improved to take full advantage of the resources of heavy oil and low-quality residual oil. At home and abroad in the depth of processing of heavy oil and residual oil, there are many problems in the process and equipment. The reactor core equipment, heavy oil hydrogenation reactor due to the heavy oil hydrogenation reaction conditions are very harsh, coke, focusing clogging problem has not been resolved. The subject that is in this context, the research and development of this new technology in a multi-level loop reactor and heavy oil hydrotreating industrial process applications. The new multi-level loop reactor is developed from the traditional single-stage loop reactor based on. Loop reactor since the fifties development, has been widely used in the chemical industry, bio-chemical, metallurgical industry and environmental chemical. Relative bubble column loop reactor in fluid dynamics and mass transfer performance has been significantly improved, but because of its draft tube outer annulus (descent stage) local gas containing low and uneven distribution of bubbles and makes the effective volume of the reactor is greatly reduced. In this paper, a new type of multi-level loop reactor is through the sidewall openings in the draft tube, to form a multi-level circulation Hydrodynamics. Part of the fluid at the opening of the draft tube running from the inside of the draft tube to the outside of the draft tube, and thus carry part of the bubble into the descent stage to increase the the annulus local gas holdup; fluid so that even within the reactor has a larger circulation speed, and also allows the reactor annulus local gas holdup as well as the overall gas holdup has been significantly improved, thus greatly improving the anti-coke capacity and processing efficiency of the reactor. The systematic study of the hydrodynamics of the new multi-level loop reactor law. Inspected the circulation reactor hydrodynamic behavior of the system of nature, operating conditions, as well as the structure size. The results prove, the system poly and nature, static liquid height, the bottom structure, the opening rate of the draft tube and the hole location on the characteristics of multi-level loop reactor. Wide operating conditions, the results and the empirical correlation, laid the foundation for the engineering design of the multi-stage loop reactor. This article further investigated the mixing and mass transfer performance of the multi-stage loop reactor. Use of advanced fiber-optic probe technology aggregation rule the circulation bubble inside the reactor under different operating conditions; basis lt; WP = 5 gt; experimental results by the appropriate mathematical treatment proposed a system of non-poly and sentenced to data and corresponding empirical correlation. Since most of the reactions are carried out under high temperature and pressure in the petroleum and chemical industries, the hydrodynamic characteristics of the high-pressure organic system in the loop reactor is of great significance. Established high-pressure circulation the reactor experimental device and the corresponding test methods, the research system, the law of the hydrodynamics of the system under pressure using nitrogen - kerosene, the empirical correlation. Experimental results show that the pressure on the circulation of liquid velocity under the conditions of this experiment has little effect on the overall gas holdup of the reactor and the pressure is proportional to the 0.32 power. On the basis of the above experimental study, by theoretical analysis of the hydrostatic pressure distribution and flow resistance in the multi-stage circulation reactor, this deduced the normal operation of the criterion of the structure of the calculation method of the multi-stage loop reactor and reactor. Be calculated based on the calculation procedures proposed in this paper, the structure of the multi-stage loop reactor, the opening position and the opening rate of the draft tube, the flow rate between holes and hole flow parameters. In this paper, our heavy oil hydrogenation industrial reaction engineering design process 50,000 tons / year of heavy oil hydrogenation multi-stage loop reactor.

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