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Apparatus for countercurrent contacting of gas and solids

A countercurrent contact and equipment technology, applied in the field of stripping towers, can solve the problems of reduced efficiency and mass transfer efficiency, and achieve the effect of avoiding channeling and effective mass transfer

Inactive Publication Date: 2006-02-15
ABB LUMMUS GLOBAL INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been found that the efficiency of mass transfer (or removal of hydrocarbons in an FCC stripper) decreases as the catalyst mass flow rate through the stripper increases
Beyond a certain point, the efficiency drops off very dramatically

Method used

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  • Apparatus for countercurrent contacting of gas and solids
  • Apparatus for countercurrent contacting of gas and solids
  • Apparatus for countercurrent contacting of gas and solids

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[0033] The relationship between capacity and efficiency has been seen experimentally by cold flow tests. The cold flow model experiments used actual catalyst and air to simulate the actual operation of an industrial FCC stripper. Tests were conducted to study the performance of prior art strippers and new equipment. In the experiment, the fluidized catalyst was injected with helium tracer gas before entering the stripper. The descending catalyst particles are contacted with the ascending gas. The ability to remove this tracer gas was measured over a range of catalyst flow rates and under a variety of equipment configurations and conditions. Samples were obtained at various points in the inlet and outlet of the stripper and in the height of the stripper, and these samples were analyzed for helium concentration.

[0034] Figure 10 shows the measured performance of the apparatus of the present invention using the new baffle arrangement compared to the performance of an existin...

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Abstract

An apparatus (200) for the countercurrent contacting of a gas and downflowing solid particles includes a housing (205) and a plurality of baffles (100) positioned within the housing. The baffles are arranged in at least first and second vertically spaced levels in successively lower position, each of the first and second levels including a row of at least two baffles oriented parallel to one another and inclined from horizontal so as to facilitate movement of the solid particles and provide the maximum area for flow. Baffles are oriented so as to laterally shift the direction of downflowing particles transversely as the particles move from one level to the next lower level and avoid channeling of the phases. The number of baffles, length and spacing is optimized to provide maximum interfacial area for interaction between the phases.

Description

technical field [0001] The present invention relates to an apparatus for countercurrent contacting of gas and fluidized solids, and in particular to a stripper for a fluid catalytic cracking process. Background technique [0002] Various chemical, petroleum processing and combustion processes require contacting fluidized solid particles with an ascending gas for efficient mass and / or heat transfer. These systems also enable chemical reactions by effectively bringing the phases into contact in countercurrent. One such widely used application is in a very important process called fluid catalytic cracking ("FCC"), which has been used in petroleum processing for many years to convert heavier (or high boiling point) The hydrocarbons are converted to more valuable lighter (or lower boiling point) components. There are many different configurations of FCC units, but all essentially consist of equipment with the same functional components. Typically, an FCC unit includes a riser,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/12C10G11/18F28D13/00
CPCC10G11/18B01J2219/1921B01J2219/1941B01J8/125B01J2208/0084F28D13/00B01J2219/1923B01J2219/1947B01J8/12B01J8/18
Inventor 保罗·E·马钱特达利普·S·索尼莱昂斯·卡斯塔尼奥斯
Owner ABB LUMMUS GLOBAL INC
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