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Technology for preparing natural gas from synthetic gas

A natural gas and synthetic gas technology, applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of high-temperature cooling of circulating gas and complex process, and achieve the effects of strong applicability, simple process, and low power consumption

Active Publication Date: 2013-08-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

CN101880558A, CN101560423A, and CN101885994A adopt the circulation of part of the gas at the outlet of the first-stage methanation reactor; CA1078186 adopts the circulation of part of the gas at the outlet of the second-stage methanation reactor; Several processes have high-temperature cooling and re-preheating of circulating gas, and the process is complex

Method used

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  • Technology for preparing natural gas from synthetic gas
  • Technology for preparing natural gas from synthetic gas
  • Technology for preparing natural gas from synthetic gas

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Embodiment 1

[0066] After conversion, desulfurization, and decarbonization of the synthetic gas 1, the total sulfur content is reduced to below 0.1ppm in the fine desulfurization tank D-101, and the arsenic and chloride in the raw gas are removed at the same time. First, the refined desulfurization feed gas 2 enters the pressure swing adsorption device P-101 through the pipeline 1001 to obtain pure hydrogen, and then the pure hydrogen is preheated to 350-550°C by electric heating or a combustion furnace or a steam preheater, and is connected in series or in parallel Reduct the complete methanation catalyst filled in the four-stage methanation reactor; after the reduction is completed, preheat the purified feed gas 2 to 240-300°C, and the pressure of the fresh synthesis gas is 2.0-5.0MPa (at 3.0MPa , 4.0MPa, 5.0MPa as examples) divide the fresh feed gas into two paths, branch 4 accounts for 30-70% of the fresh synthesis gas; 27 mixed, and mixed with the steam 201 supplied through the indepe...

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Abstract

The invention provides a technology for preparing natural gas from synthetic gas. The methanation technology mainly comprises steps of: synthetic gas fine-desulfurization, multistage methanation reaction, multistage heat recovery, product gas dehydration and catalyst reduction and passivation. A purified synthetic gas enters a multistage(multilevel) fixed bed reactor filled with a methanation catalyst, the concentration of CO in a product gas is reduced to ppm level, and the concentration of methane reaches more than 95%; the product gas undergoes triglycol or pressure swing adsorption to be dehydrated, thus meeting pipeline-transportation standards; and as for the step of multistage heat recovery, heat released from the methanation reaction process undergoes multistage heat exchange to obtain a high-grade by-product of superheated or saturated steam. The invention almost covers all key techniques related to methane preparation by synthetic gas. The technology provided by the invention has strong operability and a latent application prospect.

Description

technical field [0001] The invention belongs to the field of methanation to natural gas, in particular to a process for synthesis gas to natural gas. Background technique [0002] my country is a country rich in coal, low in oil, and poor in gas, and the contradiction between supply and demand of oil and gas resources has existed for a long time. Especially with the rapid development of my country's economy, the pressure on people's livelihood and environmental protection has increased sharply. Compared with natural gas, the existing coal utilization method has low energy utilization efficiency and significant pollutant emissions. For this reason, my country's demand for natural gas, a clean energy source, is also growing explosively, with an annual growth rate of 13-15%. According to data released by the National Bureau of Statistics in 2010, natural gas consumption in my country accounted for 3.9% of total energy consumption in 2009, and this figure will rise to 8.3% in ...

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Application Information

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IPC IPC(8): C10L3/08
Inventor 王树东王胜李德伏苏宏久彭家喜袁中山
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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