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Multi-scale bubble generating method and device suitable for enhancing mass transfer in slurry bed

A production method and slurry bed technology, applied in chemical instruments and methods, chemical/physical processes, treatment with moving solid particles, etc. The effect of saving operating costs, improving body mass transfer coefficient, and reducing hydrogen oil ratio

Pending Publication Date: 2019-09-24
SHANGHAI MISU ENVIRONMENTAL PROTECTION TECHCO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the surface renewal gas-liquid mass transfer theory, reducing the bubble size alone cannot meet the requirements of slurry bed hydrogenation mass transfer

Method used

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  • Multi-scale bubble generating method and device suitable for enhancing mass transfer in slurry bed
  • Multi-scale bubble generating method and device suitable for enhancing mass transfer in slurry bed
  • Multi-scale bubble generating method and device suitable for enhancing mass transfer in slurry bed

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Embodiment 1

[0039] At present, there are mainly two forms of slurry bed gas distributors at home and abroad, one is that the gas phase enters the slurry bed through the nozzle; the other is that the gas enters the slurry bed through the distribution plate. However, there are many disadvantages in both methods. For example, the gas phase enters the slurry bed through the nozzle, and the bubble size is not uniform, and basically tends to be small bubbles. The gas will be reacted in the middle and lower parts of the bed, resulting in a reaction in the upper part of the bed. Weak, poor mass transfer effect; and if the gas phase enters the slurry bed through the distribution plate, the bubble size is large, the bubble rising speed is high, the residence time is short, the gas-liquid contact area is small, the mass transfer effect is poor, and the product conversion rate is low . However, the combination of micro-bubble generation and bubbling ring is adopted, and hydrogen exists in the residua...

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Abstract

The invention relates to a multi-scale bubble generating method and device suitable for enhancing mass transfer in a slurry bed. The method comprises the following steps: inferior residual oil enters the bottom of a reactor from a liquid phase inlet located in the bottom of the slurry bed, and premixed hydrogen passes through a primary distributor to form a gas-liquid mixture at the bottom of the reactor; the inferior residual oil and the pre-mixed hydrogen enter diversion inlets of spray nozzles; the residual oil and hydrogen entering the spray nozzles are ejected from outlets of the spray nozzles to generate microbubbles, and the generated premixed hydrogen microbubbles rises along with flow of a liquid phase; and in addition, additional hydrogen enters a directional bubbling device, and larger bubbles generated by the bubbling device and the microbubbles generated by the spray nozzles are uniformly mixed and rise. According to the method provided by the invention, the hydrogen is dispersed into the residual oil in the form of coexistence of the microbubbles and the large bubbles, so that the gas holdup rate in hydrogenation of the residual oil in the slurry bed is improved, and the progress of the hydrogenation reaction is promoted.

Description

technical field [0001] The invention relates to a method and a device for enhancing the mass transfer of a slurry bed, more specifically to a method and a device for generating multi-scale bubbles suitable for enhancing the mass transfer of a slurry bed, and belongs to the field of chemical equipment. Background technique [0002] Petroleum is the most widely used energy source in the world. At present, the trend of heavy crude oil, high acidification, and high sulfuration is intensifying. With the increasingly stringent environmental protection regulations and the increasing demand for light petroleum, the world's oil refining industry needs to improve the conversion efficiency of residual oil as soon as possible. According to the processing level, the residual oil processing technology can be divided into two types: residual oil hydrogenation and residual oil decarburization. In recent years, the hydrogenation process has developed rapidly due to its remarkable treatment e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/08C10G49/12
CPCB01J8/08C10G49/12
Inventor 杨强许萧杨健宋智博刘凯祥徐道尉黄燎云万锦章张小宁
Owner SHANGHAI MISU ENVIRONMENTAL PROTECTION TECHCO LTD
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