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Sulfur methanation resistant process for preparing substitute natural gas from synthetic gas

A sulfur-resistant methanation technology that replaces natural gas. It is applied in the petroleum industry, gas fuel, fuel, etc. It can solve the problems of sulfur intolerance, easy poisoning and deactivation, etc., and achieves good isothermal performance, convenient operation, stability and control, and shortens the process. The effect of the process

Inactive Publication Date: 2014-10-01
SEDIN ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the methanation catalyst in the existing coal-to-natural gas process that it is not resistant to sulfur and is easily poisoned and deactivated when encountering trace amounts of sulfur, the purpose of the present invention is to provide a method that provides a high energy utilization rate, low equipment investment and operating costs, and is easy to use. Operational process suitable for coal-to-syngas sulfur-tolerant methanation to synthesize natural gas

Method used

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  • Sulfur methanation resistant process for preparing substitute natural gas from synthetic gas

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Effect test

Embodiment 1

[0038] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0039] 80-100 mesh, specific surface area 150m 2 / g γ-Al 2 o 3 Calcined at 400°C for 4h, at a temperature of 25°C and a stirring speed of 100r / min, the Mo(NO 3 ) 3 ·5H 2 O, Ni(NO 3 ) 2 ·6H 2 O, γ-Al 2 o 3 According to the mass percentage of Mo: Ni: Al 25%: 30%: 45% equal volume impregnation and stirring for 8 hours, after standing for 4 hours, evaporate to viscous at 60°C, then put it in an oven to dry at 80°C for 12 hours, and then grind to 80-100 mesh Place in a muffle furnace and bake at 450°C for 4 hours to obtain a precursor; the volume composition is 20%H 2 and 80% N 2 , in an atmosphere with a flow rate of 100mL / min, using a two-stage temperature program, first raising the temperature to 350 °C at 4 °C / min, and then raising the temperature to 500 °C at 2 °C / min for 6 hours to obtain Mo:Ni:Al mass percentage 25% : 30%: 45% Mo-Ni-Al slurry bed synthesis gas sulfur-toleran...

Embodiment 2

[0046] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0047] 60-80 mesh, specific surface area 150m 2 / g γ-Al 2 o 3 Calcined at 450°C for 5h, at a temperature of 35°C and a stirring speed of 120r / min, the Mo(NO 3 ) 3 ·5H 2 O, NH 4 VO 3 , Ni(NO 3 ) 2 ·6H 2 O, γ-Al 2 o 3 According to the mass percentage of Mo:V:Ni:Al 25%: 10%: 30%: 35% equal volume impregnation and stirring for 8 hours, after standing for 4 hours, evaporate to viscous at 80°C, then dry in an oven at 110°C for 12 hours, and then grind To 60-80 mesh, place it in a muffle furnace and bake at 550 ° C for 6 hours to obtain a precursor; the volume composition is 25% H 2 and 75%N 2 , in an atmosphere with a flow rate of 80mL / min, using a two-stage temperature program, first raising the temperature to 350°C at 5°C / min, and then raising the temperature to 550°C at 3°C / min for 6 hours to obtain Mo:V:Ni:Al mass percentage 25%: 10%: 30%: 35% Mo-V-Ni-Al slurry bed synthesis g...

Embodiment 3

[0054] Preparation of catalyst for sulfur-tolerant methanation of syngas in slurry bed:

[0055] 160-200 mesh, specific surface area 280m 2 / g SiO 2 Calcined at 550°C for 7h, at a temperature of 30°C and a stirring speed of 180r / min, the Mo(NO 3 ) 3 ·5H 2 O, Co(NO 3 ) 2 ·6H 2 O, SiO 2 According to the mass percentage of Mo: Co: Si 30%: 25%: 45% equal volume impregnation and stirring for 18 hours, after standing for 10 hours, evaporate at 60°C to viscous, then put it in an oven to dry at 100°C for 24 hours, and then grind to 160-200 mesh Place in a muffle furnace and bake at 500°C for 8 hours to obtain a precursor; the volume composition is 15%H 2 and 85%N 2 , in an atmosphere with a flow rate of 120mL / min, a two-stage temperature program was adopted. First, the temperature was raised to 350°C at 5°C / min, and then the temperature was raised to 600°C at 2°C / min. %: 25%: 45% Mo-Co-Si slurry bed synthesis gas sulfur-tolerant methanation catalyst for standby.

[0056] (1...

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Abstract

The invention relates to a sulfur methanation resistant process for preparing substitute natural gas from synthetic gas. The process comprises the steps: enabling raw material gas, which is formed through carrying out hydrogen supplementing on the synthetic gas, to enter a slurry-bed reactor from the bottom of a slurry bed, carrying out methanation, discharging crude product gas from the top of the slurry-bed reactor, enabling the crude product gas to enter a gas-liquid-solid separator, enabling a liquid-solid phase, obtained through separating, and a catalyst containing an inert medium, which is discharged from the bottom of the slurry reactor, to enter a liquid-solid separator together, discharging a solid phase separated by the liquid-solid separator from the bottom of the liquid-solid separator, enabling the separated solid phase to enter a catalyst regeneration device, and carrying out catalyst regeneration; and discharging a liquid phase separated by the liquid-solid separator from the middle-upper part of the liquid-solid separator, returning the liquid phase to the slurry-bed reactor, and purifying the crude product gas separated by the gas-liquid-solid separator, thereby preparing the natural gas. The process has the advantages of high energy source utilization ratio, low equipment investment and operating costs and easiness in operation.

Description

technical field [0001] The invention belongs to a process for synthesizing natural gas, in particular to a process for producing synthetic natural gas through sulfur-resistant methanation of coal-based syngas. Background technique [0002] Coal, oil and natural gas are the three pillars of the world's energy structure. Natural gas is a clean and efficient energy resource. In the current world energy consumption structure, natural gas accounts for 24%, while the proportion of natural gas in my country is less than 5%, which is far lower than the world average. There is an urgent need to increase the consumption of natural gas. On the other hand, my country is rich in coal resources, but they are mainly concentrated in remote areas in the central and western regions, while energy consumption is mainly concentrated in the central and eastern regions. Coal transportation capacity and economy are factors that restrict the direct use of coal. Therefore, it is of great economic ...

Claims

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Application Information

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IPC IPC(8): C10L3/08
Inventor 李晓张庆庚崔晓曦曹会博左永飞
Owner SEDIN ENG
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