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Down-flow catalytic cracking/ cracking reactor for processing heavy raw oil

A cracking reactor and catalytic cracking technology, which is applied in the field of downward catalytic cracking/cracking reactors, can solve problems such as gas-solid back-mixing, downward sliding, axial and radial particle density, and uneven velocity distribution, so as to improve carbon burning Effects of conversion rate, reduction of secondary reactions, and control of contact time

Inactive Publication Date: 2004-11-17
TSINGHUA UNIV
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Problems solved by technology

Since the direction of gas-solid motion in the co-current upward circulating fluidized bed is against the gravity field, the particles tend to slide downward under the action of gravity, resulting in serious gas-solid back-mixing phenomenon, uneven particle density and velocity distribution in the axial and radial directions, and further Cause some catalyst particles to stay in the reactor for too long, resulting in coking and affecting the improvement of catalytic cracking reaction selectivity

Method used

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  • Down-flow catalytic cracking/ cracking reactor for processing heavy raw oil

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Embodiment Construction

[0014] figure 1Shown is a down-flow FCC / cracking reactor processing a heavy feedstock. The downstream catalytic cracking / cracking reactor consists of a pre-riser connecting the gas-solid co-current downstream ultra-short contact catalytic reactor, a stripper and a two-stage regenerator. On the top of the down-flow catalytic cracking reactor 1, there is a dense-phase turbulent inlet 2 for the catalyst and raw oil gas; the down-bed reactor 1 and the pre-riser 6 are provided with secondary oil injectors 3 and 4; the down-bed reactor 1 The end of the main body is provided with a gas-solid rapid separation device 5, and the rear 5 of the separation device is provided with a stripper 7, and a ridge-shaped member 8 and a gas distributor 9 are provided in the stripper 7; The form enters the dense-phase turbulent inlet 2; the raw oil gas and atomized steam are sprayed through the multiple nozzles on the dense-phase turbulent inlet 2; the catalyst particles and atomized oil and gas are...

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Abstract

The invention discloses a down-flow catalytic cracking / cracking reactor for processing heavy raw oil, comprising a gas-solid parallel flow descending super short contact catalytic reactor, a steam stripping device, a cascade turbulent fluidized bed form first section regenerator and a lift tube form second section regenerator, wherein the second section regenerator is connected to the main unit of the reactor through a pre-lift tube.

Description

technical field [0001] The invention belongs to the scope of petrochemical processing equipment, in particular to a downward catalytic cracking / cracking reactor for processing heavy raw oil. Background technique [0002] The present invention relates to a form of down-flow catalytic cracking / cracking reactor for processing heavy feed oil. Catalytic cracking is an important industrial process in the oil refining industry. At present, petroleum enterprises continue to use and flow up the fast circulating fluidized bed system for catalytic cracking reaction. Since the direction of gas-solid motion in the co-current upward circulating fluidized bed is against the gravity field, the particles tend to slide downward under the action of gravity, resulting in serious gas-solid back-mixing phenomenon, uneven particle density and velocity distribution in the axial and radial directions, and further It causes some catalyst particles to stay in the reactor for too long, leading to cok...

Claims

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Application Information

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IPC IPC(8): C10G11/00
Inventor 魏飞钱震张明辉汪展文金涌
Owner TSINGHUA UNIV
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