Method and device for producing hydrocarbons by connecting low-temperature Fischer-Tropsch section and high-temperature Fischer-Tropsch section in series

A low-temperature and high-temperature technology, applied in the field of Fischer-Tropsch synthesis, can solve the problems of low conversion rate of raw materials and low carbon utilization rate, and achieve the effects of improving economic benefits, improving utilization efficiency, and realizing diversity

Inactive Publication Date: 2020-06-16
YANKUANG ENERGY R&D CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0028] The object of the present invention is to provide a method for producing hydrocarbons in series in two stages of low-temperature Fischer-Tropsch and high-temperature Fischer-Tropsch in order to overcome the defects of product diversity, low raw material conversion rate, and low carbon utilization rate in the above-mentioned prior art and the method Apparatus for the method

Method used

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  • Method and device for producing hydrocarbons by connecting low-temperature Fischer-Tropsch section and high-temperature Fischer-Tropsch section in series
  • Method and device for producing hydrocarbons by connecting low-temperature Fischer-Tropsch section and high-temperature Fischer-Tropsch section in series
  • Method and device for producing hydrocarbons by connecting low-temperature Fischer-Tropsch section and high-temperature Fischer-Tropsch section in series

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Embodiment 1

[0071] A kind of low-temperature Fischer-Tropsch and high-temperature Fischer-Tropsch two-stage method for producing hydrocarbons in series, adopting such as figure 1 The process flow shown, the raw material is fresh syngas from coal gasification, which has been transformed and purified, with a gas volume of 620,000 Nm 3 / h, H 2 / CO is 1.69, and the fresh gas composition is shown in Table 1.

[0072] Table 1 Composition of fresh air

[0073]

[0074] The first-stage low-temperature Fischer-Tropsch synthesis reactor is a slurry bed reactor, using precipitated iron catalyst, the reaction temperature is 240°C, the reaction pressure is 2.9MPa(G), the circulation ratio is 1, and the reactor inlet H 2 / CO is 1.86, and the Fischer-Tropsch synthesis reactor produces 494.46t / h of 1.6MPa(G) steam by-product. Reaction separation produces 50.63t / h of paraffin, 13.94t / h of low-temperature heavy oil, 21.85t / h of low-temperature light oil, 110.68t / h of low-temperature reaction water, a...

Embodiment 2

[0110] This embodiment adopts figure 1 Process flow shown, fresh synthesis gas from natural gas conversion and purification, gas volume 620,000 Nm 3 / h, H 2 / CO is 2.12, and the fresh gas composition is shown in Table 10.

[0111] Table 10 Fresh gas composition

[0112] temperature °C 40 Pressure MPa(G) 3.1 composition mol% H 2

67.37 CO 31.78 CO 2

0.10 CH 4

0.37 N 2

0.28 Ar 0.10

[0113] The first-stage low-temperature Fischer-Tropsch synthesis reactor is a slurry bed reactor, using a cobalt-based catalyst, the reaction temperature is 230°C, the reaction pressure is 2.9MPa(G), the circulation ratio is 1, and the reactor inlet H 2 / CO is 2.18, and the Fischer-Tropsch synthesis reactor produces 386.17t / h of 1.6MPa(G) steam by-product. Reaction separation produces 33.59t / h of paraffin, 15.13t / h of low-temperature heavy oil, 23.48t / h of low-temperature light oil, 113.26t / h of low-temperature reaction wa...

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Abstract

The invention relates to a method for producing hydrocarbons by connecting a low-temperature Fischer-Tropsch section and a high-temperature Fischer-Tropsch section in series, wherein the method comprises the following steps: (1) introducing synthesis gas into a low-temperature Fischer-Tropsch synthesis reactor, carrying out a reaction, and separating reaction products to obtain high-carbon-numberhard paraffin, a low-temperature liquid hydrocarbon product, low-temperature reaction water and low-temperature Fischer-Tropsch tail gas; (2) feeding the low-temperature Fischer-Tropsch tail gas intoa decarburization device to completely or partially remove CO2, feeding the CO2-removed gas as a high-temperature Fischer-Tropsch raw material gas into a high-temperature Fischer-Tropsch synthesis reaction for reaction, and separating reaction products to obtain a high-temperature liquid hydrocarbon product, high-temperature reaction water and high-temperature Fischer-Tropsch tail gas; and (3) carrying out separation treatment on the low-temperature liquid hydrocarbon product and the high-temperature liquid hydrocarbon product to obtain the product. Compared with the prior art, efficient conversion of raw material gas and gradient utilization of energy are realized, the utilization efficiency of carbon is improved, the diversity of coal chemical products is realized, and the risk resistance of the Fischer-Tropsch synthesis device is improved.

Description

technical field [0001] The invention relates to the technical field of Fischer-Tropsch synthesis, in particular to a method and device for producing hydrocarbons in series in two stages of low-temperature Fischer-Tropsch and high-temperature Fischer-Tropsch. Background technique [0002] The Fischer-Tropsch synthesis reaction refers to the synthesis gas (main component H 2 , CO) is converted into hydrocarbons and other chemicals under certain temperature and pressure conditions under the action of a catalyst. The production of liquid fuels from gaseous fuels such as fuel or natural gas through Fischer-Tropsch synthesis has attracted more and more attention. [0003] The reaction of Fischer-Tropsch synthesis to produce hydrocarbons can be expressed as: [0004] nCO+(2n+1)H 2 →C n h 2n+2 +nH 2 O (1) [0005] nCO+2nH 2 →C n h 2n +nH 2 O (2) [0006] In addition to generating hydrocarbons, there are some side reactions to generate organic oxygen compounds (alcohols, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G2/00
CPCC10G2/341C10G2/342C10G2/344
Inventor 孙启文岳建平刘继森
Owner YANKUANG ENERGY R&D CO LTD
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