Technique for synthesizing natural gas from coke oven gas by sulfur-resistant methanation

A technology resistant to sulfur methanation and coke oven gas, applied in the petroleum industry, gas fuel, fuel and other directions, can solve the problems of affecting the natural gas yield, waste of resources and environment, and large differences in composition, saving equipment investment and energy consumption , The effect of less equipment investment, reducing equipment investment and energy consumption

Inactive Publication Date: 2014-12-10
SEDIN ENG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In 2012, my country's coke output reached 443 million tons, if one ton of coke produced 430m 3 Calculation of coke oven gas, the by-product coke oven gas in that year alone was as high as 190.5 billion m 3 , of which about 70% of the coke oven gas is used for coke oven heating and domestic gas, while the remaining nearly 57 billion m 3 Coke oven gas has not been utilized, resulting in serious waste of resources and environmental pollution
The sulfur-tolerant methanation catalyst not only has the performance of methanation and organic sulfur hydrogenation, but also has the catalytic performance of water vapor shift and inverse water vapor shift. The water generated by methanation and the H of coke oven gas 2 The reverse water vapor shift reaction inevitably occurs and eventually reaches equilibrium, resulting in CO and CO in the syngas 2 It is difficult to convert completely, which affects the yield of natural gas; the existing sulfur-tolerant methanation catalysts are all multifunctional catalysts for the conversion and methanation of coal gasification synthesis gas. Due to the large difference in composition of coke oven gas and coal gasification synthesis gas, There are many uncertainties

Method used

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  • Technique for synthesizing natural gas from coke oven gas by sulfur-resistant methanation
  • Technique for synthesizing natural gas from coke oven gas by sulfur-resistant methanation
  • Technique for synthesizing natural gas from coke oven gas by sulfur-resistant methanation

Examples

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Embodiment 1

[0032] 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 13wt%-ZrO 2 14.5wt% / γ-Al 2 o 3 72.5 wt% catalyst, active component MoO 3 and additive ZrO 2 Loaded on γ-Al by co-precipitation 2 o 3 Above, see CN103480362A embodiment 7 for specific preparation method and technique; The mass composition of the nickel-based catalyst in the methanation reactor is NiO40wt%-La 2 o 3 7wt%-Al 2 o 3 43wt% - ZrO 2 7wt%, see CN102029162A Example 5 for the specific preparation method and steps. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0033] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 50%, CO8%, CO 2 4%, CH 4 27%, N 2 7% and C 2-4 The coke oven gas with 4% hydrocarbons first passes through the inlet and outlet heat exchanger II to exchange heat with the...

Embodiment 2

[0038] 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 the methanation reactor adopts Davy's CEG-LH catalyst. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0039] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 53.8%, CO7.3%, CO 2 3.7%, CH 4 25%, N 2 6.7% and C 2-4 The coke oven gas with 3.5% hydrocarbons first passes through the inlet and outlet heat exchanger II to exchange heat with the outlet gas of the sulfur-resistant methanation reactor II, and then through the inlet and outlet heat exch...

Embodiment 3

[0044] 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 Above, see CN102463118A embodiment 5 for specific preparation method and technique; The mass composition of the nickel-based catalyst in the methanation reactor is NiO75wt%-La 2 o 3 7wt%-Al 2 o 3 15wt% - ZrO 2 3wt%, see CN102029162A Example 4 for the specific preparation method and steps. Adopt above-mentioned catalyzer, its concrete technological process and condition are as follows:

[0045] (1) After deoiling, deamination, debenzene and naphthalene removal, it is composed of H 2 54.7%, CO6.9%, CO 2 3.5%, CH 4 25.6%, N 2 6.1% and C 2-4 The coke oven gas with 3.2% hydrocarbons first exc...

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Abstract

The invention relates to a technique for synthesizing natural gas from coke oven gas by sulfur-resistant methanation, which comprises the following steps: carrying out oil removal, naphthalene removal, benzene removal and removal of other impurities on the coke oven gas, directly carrying out two-stage methanation reaction on a supported molybdenum-base sulfur-resistant methanation catalyst, carrying out ferric oxide crude desulfurization and activated carbon fine desulfurization, carrying out cleaning reaction by Ni-base methanation reaction, and finally, carrying out cryogenic liquefaction to separate out impurities N2, H2, H2O and a small amount of CO2, thereby obtaining the liquefied natural gas product with the methane content of up to 99%. The technique has the advantages of simple technical process, less equipment investment, and comprehensive energy consumption and high quality of the natural gas product.

Description

technical field [0001] The invention belongs to a process for synthesizing natural gas, in particular to a process for synthesizing natural gas through sulfur-resistant methanation of coke oven gas. Background technique [0002] my country is the world's largest coke producer, consumer and exporter. In 2012, my country's coke output reached 443 million tons, if one ton of coke produced 430m 3 Calculation of coke oven gas, the by-product coke oven gas in that year alone was as high as 190.5 billion m 3 , of which about 70% of the coke oven gas is used for coke oven heating and domestic gas, while the remaining nearly 57 billion m 3 Coke oven gas has not been utilized, resulting in serious waste of resources and environmental pollution. Coal-based natural gas is a high-quality, efficient and safe clean energy. 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 i...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 李晓崔晓曦范辉张庆庚李德宝贾丽涛孙德魁史郭晓
Owner SEDIN ENG
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