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Treatment method of cycle tail gas in Fischer-Tropsch synthetic oil process

A Fischer-Tropsch synthetic oil and process cycle technology, which is applied in the petroleum industry, chemical instruments and methods, and the preparation of liquid hydrocarbon mixtures, can solve the problems of complex process operation and large equipment investment, and achieve simple process flow and low equipment investment , the effect of improving the utilization rate

Active Publication Date: 2018-08-17
SINOPEC NINGBO ENG +2
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Problems solved by technology

This type of technology has the defects of large equipment investment and complicated process operation

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  • Treatment method of cycle tail gas in Fischer-Tropsch synthetic oil process

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] Such as figure 1 As shown, the treatment method of the Fischer-Tropsch synthetic oil process cycle tail gas comprises the following steps:

[0019] The circulating tail gas from the Fischer-Tropsch synthesis reactor at a temperature of about 60 °C and a pressure of 2.24 MPa contains CH 4 、C 2 h 6 、C 3 h 8 、C 4 h 10 and C 5+ , entering the first heat exchanger 1 and exchanging heat with the syngas from the catalytic combined reforming reactor to 600-700°C. The first circulating exhaust gas with a volume flow rate of 60% enters the plasma generator 3 . Under the action of enhanced electric field, various gas components in the circulating exhaust gas are excited, the gas temperature rises to about 2727°C, and a large number of high-energy electrons are generated. These high-energy electrons interact with the gas molecule CH 4 、H...

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Abstract

The invention relates to a Fischer-Tropsch synthetic oil process circulation tail gas treatment method. The method is characterized in comprising the following steps: circulation tail gas is subjected to heat exchange with synthesis gas from a combined catalysis and reforming reactor through a first heat exchanger, and is divided into two streams; a first stream of the circulation tail gas enters a plasma generator; a second stream of the circulation tail gas enters a gas mixer and is mixed with a certain proportion of high-pressure steam, such that water content in the raw gas is adjusted; mixed gas from the mixer and plasma gas from the plasma generator are respectively injected into the combined catalysis and reforming reactor from a top inlet of the combined catalysis and reforming reactor; the gases are mixed, and the mixed gas enters a catalytic reaction part and is subjected to a combined catalysis and reforming reaction; synthetic gas from the combined catalysis and reforming reactor is subjected to heat recovery, and a liquid phase is separated, such that the gas can be recycled as circulation tail gas.

Description

technical field [0001] The invention relates to a treatment method for circulating tail gas of F-T synthetic oil process. Background technique [0002] Fischer-Tropsch synthetic oil technology is a very important technology in the production technology of alternative liquid fuels. The core reaction of the Fischer-Tropsch synthetic oil technology is the F-T synthesis reaction, which has a low one-pass reaction rate and needs to discharge the unreacted tail gas at the outlet of the reactor, pressurize it and circulate it back to the reactor to participate in the reaction again, so as to improve the conversion rate of the synthesis gas . In addition to about 26.5% of unreacted CO and about 42.2% of hydrogen, the tail gas of Fischer-Tropsch synthesis reaction also contains about 22% of CH 4 and 1% CO 2 , 3% Ar+N 2 and 5% C 2+ , although these components have no obvious effect on the synthesis reaction, they will occupy the effective space of the reactor and reduce the effec...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/38C10G2/00
CPCY02P20/10
Inventor 李管社
Owner SINOPEC NINGBO ENG
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