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Methanation reaction system and regeneration technology of methanation catalyst

A reaction system, methanation technology, applied in the field of methanation reaction system and its technology

Active Publication Date: 2013-08-28
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the reaction process, in order to prevent the deactivation of Ni-based methanation reaction catalyst from carbon deposition, a large amount of water vapor was added to the feed gas. The problem of the catalyst eventually deactivating due to carbon deposition

Method used

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  • Methanation reaction system and regeneration technology of methanation catalyst
  • Methanation reaction system and regeneration technology of methanation catalyst
  • Methanation reaction system and regeneration technology of methanation catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0047] use as figure 2 The shown methanation reaction system and process of the present invention are used for methanation reaction experiments.

[0048] The chemical composition of the catalyst used is: 15NiO / 100ZrO 2 (weight ratio).

[0049] The methanation reaction conditions are: reaction temperature: 450°C, reaction pressure: 0.1MPa, reaction time: 5 hours, H in the synthesis gas raw material 2 / CO (volume ratio) is 1, the syngas feed temperature is 100°C, and the space velocity (GHSV) of the syngas at the reactor inlet is 24,000 times the catalyst volume per hour.

[0050] After 5 hours of reaction, the CO conversion rate dropped from 85% to 80%, indicating that the Ni-based catalyst had carbon deposition. At this time, the feed gas is composed of H 2 and CO syngas feedstock switching to CO 2 The raw material gas makes the carbon-deactivated catalyst in the reactor undergo carbon elimination regeneration reaction, and at the same time feeds the synthetic gas raw ma...

Embodiment 2

[0059] In addition to changing the catalyst chemical composition from 15NiO / 100ZrO 2 (weight ratio) becomes 20NiO / 100ZrO 2 (weight ratio), change the methanation reaction pressure and carbon removal regeneration reaction pressure from 0.1MPa to 3MPa, change the methanation reaction time from 5 hours to 3 hours, and change the number of methanation reaction-carbon removal regeneration reaction cycles from 5 Times become 10 times, repeat the experimental process of embodiment 1.

[0060] The experiment found that the original CO conversion rate of the catalyst was 98%, and the CO conversion rate of the catalyst during carbon removal and regeneration was 90%. After each methanation reaction-carbon removal regeneration reaction cycle, the catalyst CO conversion rate (catalytic activity) was basically Return to the original level, that is, the CO conversion rate of the catalyst is restored from 90% to 98%.

Embodiment 3

[0062] In addition to changing the catalyst chemical composition from 15NiO / 100ZrO 2 (weight ratio) becomes 18NiO / 100ZrO 2 (weight ratio), the H in the syngas 2 / CO (volume ratio) was changed from 1 to 2, and the methanation reaction time was changed from 5 hours to 15 hours, the experimental process of Example 1 was repeated.

[0063] The experiment found that the original CO conversion rate of the catalyst was 95%, and the CO conversion rate of the catalyst during carbon removal and regeneration was 87%. Return to the original level, that is, the CO conversion rate of the catalyst is restored from 87% to 95%.

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Abstract

The invention discloses a methanation reaction system and a regeneration technology of a methanation catalyst. The methanation reaction system comprises at least two parallel-connected reactors, wherein at least the other reactor is used for carrying out the catalyst carbon elimination regeneration reaction under the participation of CO2 or also carrying out the methanation reaction while the at least one reactor is used for carrying out the methanation reaction, each reactor is used for alternatively carrying out the methanation reaction and the catalyst carbon elimination regeneration reaction, so that the methanation reaction is smoothly and continuously carried out, and meanwhile, a catalyst maintains original reaction activity. The invention also relates to the catalyst carbon elimination regeneration technology; and according to the regeneration technology, carbon deposits on the surface of the catalyst are in contact with the CO2 and react to generate CO, thus the carbon deposits on the surface of the catalyst are cleared away, so that the catalyst is regenerated.

Description

technical field [0001] The invention relates to a methanation reaction system and a process thereof, and at the same time, the invention also relates to a regeneration process of a methanation reaction catalyst. Background technique [0002] Methanation is a critical step in the conversion of solid carbonaceous materials such as coal and biomass into synthetic natural gas (or substitute natural gas, SNG). In this step, coal and biomass gasification product streams (commonly referred to as syngas) enriched in CO, CO2, and hydrogen are converted to CH-enriched as pipeline-grade quality products through the following reversible reactions: 4 gas: [0003] (reaction 1) [0004] (Reaction 2) [0005] (Reaction 3) [0006] Conventional methanation is based on Reaction 1, which requires H 2 The molar ratio of CO / CO is about 3:1, while the direct methanation reaction is mainly based on reaction 2, which requires H 2 The molar ratio of / CO is 1:1. Compared with the ...

Claims

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Application Information

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IPC IPC(8): C07C9/04C07C1/04B01J23/94B01J38/04
CPCY02P20/584
Inventor 田大勇郑文涛徐柏庆孙守理孙琦苗强
Owner CHNA ENERGY INVESTMENT CORP LTD
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