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Novel process for making synthetic natural gas by using coke-oven gas

A technology for synthesizing natural gas and coke oven gas, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of insufficient utilization of hydrogen, high investment, high operating costs, and low utilization of hydrogen resources, so as to prevent sulfur poisoning and improve Recovering waste heat and strong heat removal ability

Active Publication Date: 2010-09-01
NANJING GOODCHINA CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] At present, some patents for efficient application of coke oven gas have made many efforts and attempts. CN191985A and CN101391935A disclose a method for utilizing coke oven gas to synthesize natural gas (or methane). 2 and H 2 The reaction produces CH 4 , and then purified by PSA to obtain qualified synthetic natural gas, but this method cannot make full use of the hydrogen in the coke oven gas
CN101100622A discloses a method and device for producing synthetic natural gas by using coke oven gas. The method fully utilizes the hydrogen in the coke oven gas by supplementing carbon, but the method cannot fully utilize CO 2 converted to CH 4 , the gas after the reaction needs to be purified by low-temperature methanol washing or PAS equipment, and its investment and operation costs are relatively high
Therefore, the present invention proposes a new process for rational utilization of coke oven gas in view of the shortcomings of low hydrogen resource utilization, high equipment investment, and poor economic benefits in the above-mentioned method for preparing natural gas from coke oven gas

Method used

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Embodiment 1

[0038] In this embodiment, the process for preparing synthetic natural gas by using coke oven gas is as follows, and the flow chart is shown in figure 1 .

[0039] Coke oven gas treated by conventional purification methods (referring to detarring, crude desulfurization, deammonization, benzene washing and benzene removal, final naphthalene removal, etc., the same below) is mixed with carbon replenishing gas. The gas composition after mixing (v% ): H 2 54.04, CO 13.14, CO 23.07, CH 4 24.22, C 2 h 4 2.10,N 2 3.03, O 2 0.28,H 2 O 0.12, H 2 S25ppm, COS 12ppm; After heat exchange, the temperature of the gas reaches 250°C and enters the Co-Mo hydrogenation reactor, where the Co-Mo hydrogenation conversion catalyst (active component: CoO 3-4%wt, MoO 3 11~13%wt, the rest is carrier γ-Al 2 o 3 ) under the action of organic sulfur into inorganic sulfur, while hydrogenating unsaturated hydrocarbons into alkanes, a small amount of O 2 with H 2 React (generate water) and...

Embodiment 2

[0043] In this embodiment, the process for preparing synthetic natural gas by using coke oven gas is as follows, and the flow chart is shown in figure 1 .

[0044] The coke oven gas treated by conventional purification methods is mixed with carbon replenishing gas, and the gas composition after mixing (v%): H 2 54.05, CO 13.14, CO 2 3.07, CH 4 24.22, C 2 h 4 2.10,N 2 3.03, O 2 0.28,H 2 O0.11, H 2 S 25ppm, COS 12ppm; the temperature of the gas reaches 255°C after heat exchange and enters the Co-Mo hydrogenation reactor. 3 11~13%wt, the rest is carrier γ-Al 2 o 3 ) under the action of organic sulfur into inorganic sulfur, while hydrogenating unsaturated hydrocarbons into alkanes, a small amount of O 2 with H 2 React (generate water) and complete partial methanation, then enter the desulfurization reactor to remove inorganic sulfur under the action of zinc oxide desulfurizer, the pressure of the hydrodesulfurization reaction is about 3.3MPa, the temperature is ...

Embodiment 3

[0047] In this embodiment, the process for preparing synthetic natural gas by using coke oven gas is as follows, and the flow chart is shown in figure 2 .

[0048] Coke oven gas treated by conventional purification methods, gas composition (v%): H 2 58.72, CO 7.29, CO 2 2.30, CH 4 25.56, C 2 h 4 2.10,N 2 3.50,O 2 0.40,H 2 O 0.13, H 2 S 53ppm, COS 27ppm: The gas temperature reaches 250°C after heat exchange and enters the Co-Mo hydrogenation reactor, where the Co-Mo hydrogenation conversion catalyst (active component: CoO 3-4%wt, MoO 3 11~13%wt, the rest is carrier γ-Al 2 o 3 ) under the action of organic sulfur into inorganic sulfur, while hydrogenating unsaturated hydrocarbons into alkanes, a small amount of O2 with H 2 React (generate water) and complete partial methanation, then enter the desulfurization reactor to remove inorganic sulfur under the action of iron-manganese desulfurizer, the pressure of hydrodesulfurization reaction is about 2.8MPa, the temp...

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Abstract

The invention belongs to the field of the comprehensive utilization of coke-oven gas, and discloses a novel process for making synthetic natural gas by using the coke-oven gas. The qualified synthetic natural gas product is produced by the process comprising the steps of hydrodesulfurization, carbon compensation, multi-level methanation, cooling, separation and the like. The process can effectively prevent the temperature runaway phenomenon of a methanation reactor, can reasonably distribute the load of the methanation reactor, improves the conversion rate of CO and CO2, and provides a new method for making the synthetic natural gas by using the coke-oven gas.

Description

technical field [0001] The invention is a new field of comprehensive utilization of coke oven gas, in particular relates to a new process for comprehensive utilization of coke oven gas to synthesize natural gas. Background technique [0002] Synthetic natural gas technology, its methanation reaction is: [0003] CO+3H 2 =CH 4 +H 2 O(g) [0004] CO 2 +4H 2 =CH 4 +2H 2 O(g) [0005] It is an effective supplementary channel to solve the current shortage of natural gas in my country, especially to solve the problem of lack of natural gas in remote areas of my country. At present, the raw material gas for synthetic natural gas mainly comes from coal gasification units. The basic composition of the gas produced by various large-scale coal gasification processes is shown in Table 1. Through a series of units such as transformation, purification, and synthesis, synthetic natural gas products are finally obtained. Its features: [0006] (1) In the gas composition produ...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 吕仲明熊世平张结喜
Owner NANJING GOODCHINA CHEM TECH
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