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Method for producing methane and co-producing liquid fuel from carbonaceous material

A liquid fuel, carbonaceous technology, applied in the field of indirect conversion of carbonaceous materials, can solve the problems of increasing energy consumption, low catalyst efficiency, reducing carbon use efficiency, etc., to save energy consumption, low equipment utilization, and improve carbon utilization. rate effect

Inactive Publication Date: 2014-12-24
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the use of this dual-functional catalyst effectively solves the problem of peak regulation, but before the methanation reaction of the syngas, it undergoes a water-gas shift reaction to adjust the H 2 / CO molar ratio, in order to be suitable for the methanation reaction, thus increasing the energy consumption, and at the same time, the water gas shift reaction has a large amount of CO 2 emissions, reducing the efficiency of carbon use
In addition, the Fischer-Tropsch synthesis reaction to generate liquid fuels requires H 2 / CO molar ratio and H required for methanation reaction 2 / CO molar ratio is different, thus resulting in polygeneration catalysts not being able to operate at their optimal H 2 Under the operating conditions of / CO molar ratio, the catalyst efficiency is low

Method used

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  • Method for producing methane and co-producing liquid fuel from carbonaceous material
  • Method for producing methane and co-producing liquid fuel from carbonaceous material
  • Method for producing methane and co-producing liquid fuel from carbonaceous material

Examples

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Effect test

Embodiment 1

[0050] This example is used to illustrate the method for producing methane cogeneration liquid fuel from carbonaceous materials provided by the present invention.

[0051]Lignite fragments with a particle size of 5-50 mm (see Table 1 for chemical composition) are gasified into crude synthesis gas with oxygen / water vapor as a gasification agent, and the obtained crude synthesis gas is sequentially cooled, detarred, crude desulfurized, After the fine desulfurization process, the net syngas (see Table 2 for the composition) is obtained, in which (CO+H 2 ) content is 63% by volume, H 2 / CO molar ratio is 1.59;

[0052] The net synthesis gas is divided into two streams, G1 and G2. Among them, G1 is sent to the Fischer-Tropsch synthesis reactor after heat exchange and temperature rise, and is mixed with a precipitated iron catalyst (composition: 94% by weight Fe 2 o 3 -5 wt%CuO-1 wt%K 2 O, the specific surface area after reduction is 168m 2 / g) contact reaction to obtain the co...

Embodiment 2

[0056] The preparation and composition of the net synthesis gas was the same as in Example 1. The entirety of this net synthesis gas is divided into two streams G1 and G2. Among them, G1 is sent to the fixed fluidized bed Fischer-Tropsch synthesis reactor after heat exchange and temperature rise, and is mixed with molten iron catalyst (Fe 2 o 3 The content is 99.6% by weight, the particle size is 20-40 mesh) contact reaction. Among them, the inlet temperature of the Fischer-Tropsch synthesis reactor is 320°C, the outlet temperature is 348°C, the pressure is 2.72MPa, and the gas space velocity is 700h -1 . The reacted product is cooled to 40°C by indirect heat exchange and divided into gas stream G f and liquid stream L f Two parts (see Table 3 for the weight ratio), in the gas stream (H 2 +CO) content of 49% by volume, H 2 / CO molar ratio is 3.94;

[0057] G2 is sent to the water-gas shift reactor after heat exchange. The catalyst is Co-Mo catalyst (manufactured by Qin...

Embodiment 3

[0060] The preparation and composition of the net synthesis gas was the same as in Example 1. The entirety of this net synthesis gas is divided into two streams G1 and G2. Among them, G1 is sent to the fixed-bed Fischer-Tropsch synthesis reactor after heat exchange and temperature rise, and is mixed with the precipitated catalyst (composition: 96% by weight Fe 2 o 3 -3 wt%CuO-1 wt%K 2 O, the specific surface area after reduction is 145m 2 / g) contact reaction. Among them, the inlet temperature of the Fischer-Tropsch synthesis reactor is 239°C, the outlet temperature is 252°C, the pressure is 2.89MPa, and the gas space velocity is 2000h -1 . The reacted product is cooled to 40°C by indirect heat exchange and divided into gas stream G f and liquid stream L f Two parts (see Table 3 for the weight ratio), in the gas stream (H 2 +CO) content of 61% by volume, H 2 / CO molar ratio is 1.98;

[0061] G2 is sent to the water-gas shift reactor after heat exchange, the catalyst ...

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Abstract

The invention provides a method for producing methane and co-producing a liquid fuel from a carbonaceous material, wherein the method includes the steps: crude synthesis gas obtained after gasification of the carbonaceous material is purified to remove impurities in the crude synthesis gas, and thus purified synthesis gas is obtained; at least a portion of the purified synthesis gas is in contact with a Fischer-tropsch synthesis reaction catalyst, a product obtained after contact is subjected to gas-liquid separation, and thus a gas product and a liquid product are obtained; and a methanation gas raw material is in contact with a methanation catalyst, wherein the methanation gas raw material contains the gas product or contains water-gas shifted gas after the gas product is subjected to water-gas shift, and the H2 / CO molar ratio in the methanation gas raw material is 2.8-3.5. According to the method, the methane can be produced and the liquid fuel can be co-produced, moreover, the load of water-gas shift in the process is effectively reduced, the energy consumption is saved, and the utilization efficiency of carbon is improved.

Description

technical field [0001] The invention relates to a method for indirect conversion of carbonaceous materials, more specifically, relates to a method for gasifying carbonaceous materials into synthesis gas, converting synthesis gas into methane gas and co-producing liquid fuel. Background technique [0002] Based on energy endowment and national energy security considerations, China is actively promoting the strategy of "replacing oil with coal" to convert coal into civil gas, transportation fuel, and basic chemical raw materials. Among them, the coal-to-natural gas technology is the process of using low-rank lignite to produce synthetic gas through gasification, and then converting it into methane, which is used as a gas fuel to replace traditional natural gas. [0003] The coal-to-natural gas process has high energy efficiency, low water consumption, and relatively mature technology, which is of great significance for developing coal in remote areas of western China, improvin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C10G2/00C10K1/00C10K1/04
Inventor 门秀杰崔德春徐庆虎熊亮刘倩于广欣
Owner CHINA NAT OFFSHORE OIL CORP
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