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A process for preparing natural gas from coal-to-synthesis gas through sulfur-resistant methanation

A technology for sulfur-resistant methanation and natural gas replacement. It is used in the petroleum industry, gas fuel, fuel and other directions. It can solve the problems of reducing conversion rate, increasing equipment investment and energy consumption, affecting the quality of natural gas, and reducing equipment size and energy. energy consumption, saving investment and operating costs, and the effect of increasing sulfur shift temperature

Active Publication Date: 2017-01-04
SEDIN ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although coal-to-natural gas is the best choice for coal cleanliness and optimal utilization, there are still many problems in the above-mentioned industrial coal-to-natural gas technology due to the limitation of methanation nickel-based catalysts: (1) The low-temperature methanol washing makes the synthesis gas have to undergo "thermal (transformation) )-cold (methanol washing)-heat (methanation)-cold (cooling compression)", the temperature has been varied from 300 to 400°C to -40°C for many times, greatly increasing equipment investment, energy consumption and operating costs; ( 2) The separate sulfur-resistant conversion unit not only increases equipment investment and energy consumption, but also due to the low heat release of water vapor conversion, when the syngas temperature and water vapor content fluctuate, it often encounters the phenomenon that the conversion temperature is too low , so that the organic sulfur in the synthesis gas cannot be completely converted into inorganic sulfur, thereby affecting the subsequent sulfur recovery efficiency; (3) Methanation is a strong exothermic reaction. Dilution will greatly increase the cycle equipment investment and cycle energy consumption
The inventors of this patent have further researched and found that when shift and methanation are carried out simultaneously under the dual-function catalyst, three reactions of methanation, water vapor shift and reverse water gas shift inevitably occur, while the syngas prepared by the existing coal gasification technology contain a lot of CO 2 , especially in the synthesis gas of crushed coal pressurized gasification mostly used in coal-to-natural gas technology 2 The volume content is as high as 28%, and after conversion and methanation, CO 2 content will further increase, a large amount of CO 2 It will lead to the occurrence of reverse water shift reaction, which will greatly reduce the conversion rate of CO. After the acid gas is eluted with low-temperature methanol, there are still a large amount of unconverted CO and H in the product gas. 2 Gas, which affects the quality of natural gas and limits its industrial application

Method used

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  • A process for preparing natural gas from coal-to-synthesis gas through sulfur-resistant methanation
  • A process for preparing natural gas from coal-to-synthesis gas through sulfur-resistant methanation
  • A process for preparing natural gas from coal-to-synthesis gas through sulfur-resistant methanation

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Experimental program
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Effect test

Embodiment 1

[0035] In this example, the catalysts used in sulfur-tolerant methanation reactor I and sulfur-tolerant methanation reactor II are the same, and the mass composition of the oxide is MoO 3 25wt%-Co 2 o 3 +ZrO 2 15wt% / CeO 2 -Al 2 o 3 60 wt% catalyst, active component MoO 3 and additive Co 2 o 3 +ZrO 2 Loaded on the carrier CeO by impregnation 2 -Al 2 o 3 For the specific preparation method and process, see Example 5 of CN102463118A; the nickel-based catalyst in methanation reactor I and methanation reactor II adopts Topsoe's MCR-2X catalyst. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0036] (1) After dust removal and oil removal, the volume composition is H 2 40.0%, CO17.0%, CO 2 33.0%, CH 4 9.6% and N 2 The 0.4% synthetic gas first exchanges heat with the outlet gas of the sulfur-tolerant methanation reactor II through the inlet and outlet heat exchanger II, and then exchanges heat with the outlet gas of t...

Embodiment 2

[0041] In this example, the catalysts used in sulfur-tolerant methanation reactor I and sulfur-tolerant methanation reactor II are the same, and the mass composition of the oxide is MoO 3 30wt%-Co 2 o 3 +Fe 2 o 3 +NiO20wt% / CeO 2 -Al 2 o 3 50 wt% catalyst, active component MoO 3 and additive Co 2 o 3 +Fe 2 o 3 +NiO is loaded on the carrier CeO by impregnation 2 -Al 2 o 3 For the specific preparation method and process, see Example 5 of CN102463118A; the nickel-based catalyst in methanation reactor I and methanation reactor II adopts Topsoe's MCR-2X catalyst. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0042] (1) After dust removal and oil removal, the volume composition is H 2 39.6%, CO17.4%, CO 2 32.5%, CH 4 10.2% and N 2 The 0.3% synthetic gas first exchanges heat with the outlet gas of the sulfur-tolerant methanation reactor II through the inlet and outlet heat exchanger II, and then exchanges heat wit...

Embodiment 3

[0047] In this embodiment, the catalyst used in the sulfur-tolerant methanation reactor I and the sulfur-tolerant methanation reactor II is the same, and its mass composition is MoO 3 35wt%-Co 2 o 3 +KO 2 2wt% / ZrO 2 63 wt% catalyst, active component MoO 3 and additive Co 2 o 3 +KO 2 Loaded on the carrier ZrO by impregnation 2 For the specific preparation method and process, see Example 14 of CN103495421A; the nickel-based catalyst in methanation reactor I and methanation reactor II adopts Davy's CEG-LH catalyst. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0048] (1) After dust removal and oil removal, the volume composition is H 2 39.1%, CO17.9%, CO 2 32.0%, CH 4 10.7% and N 2 The 0.3% synthetic gas first exchanges heat with the outlet gas of the sulfur-tolerant methanation reactor II through the inlet and outlet heat exchanger II, and then exchanges heat with the outlet gas of the sulfur-tolerant methanation ...

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Abstract

A process for coal-to-synthesis gas to replace natural gas through sulfur-tolerant methanation is that the synthesis gas enters sulfur-tolerant methanation reactors I and II in sequence, and the mixed gas of synthesis gas and water vapor undergoes sulfur-tolerant transformation on a molybdenum-based bifunctional catalyst After reacting with sulfur-resistant methanation, enter the low-temperature methanol washing system to remove impurities such as CO2 and H2S in the gas, and then pass through methanation reactors I and II in sequence, and carry out methanation reaction under the action of Ni-based methanation catalyst. Get natural gas products. The invention has the advantages of simple process flow, less equipment investment, low comprehensive energy consumption and excellent natural gas products.

Description

technical field [0001] The invention belongs to a coal-to-natural gas process, in particular to a process for preparing coal-to-synthetic gas through sulfur-resistant methanation to replace natural gas. Background technique [0002] my country is rich in coal, poor in oil and low in gas, and the proportion of natural gas consumption is far lower than the world average. In recent years, with the rapid increase of natural gas demand in my country, the gap between domestic natural gas supply and demand has gradually increased, which in turn has restricted the steady and rapid development of my country's national economy. Coal-to-natural gas is a technology that uses coal as raw material to produce natural gas. It can convert coal into a clean fuel CH that is convenient for long-distance transportation. 4 , is an important way to optimize the domestic energy structure, alleviate the contradiction between supply and demand of natural gas, and realize the efficient and clean conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/08
Inventor 崔晓曦范辉张庆庚李晓李德宝贾丽涛孙德魁
Owner SEDIN ENG