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A technology for synthesizing natural gas and synthesis gas, which is applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of low reaction space velocity, low steam grade, and low reaction heat utilization efficiency, etc., and achieves easy adjustment and high reaction space velocity. Effect
Inactive Publication Date: 2011-11-02
大连瑞克科技股份有限公司
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However, the grade of by-product steam in this process is low, and the utilization efficiency of reaction heat is not high; in addition, due to the limitation of heat transfer rate, the reaction space velocity is small and the reaction equipment is relatively large
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Embodiment 1
[0022] Using lignite as raw material, the gas composition after gas generation is (V%):
[0024] The ratio of hydrogen to carbon is: (50.7-3.9) / (34.1+3.9)=1.23, which is used as high-carbon synthesis gas.
[0025] After ~69% of the above gas is converted and decarburized, the composition of the synthesis gas is as follows (V%):
[0026] h 2 : 75.0; CO: 9.8; CO 2 : 3.9; CH 4 : 10.9; Inert gas: 0.4
[0027] The ratio of hydrogen to carbon is: (75.0-3.9) / (9.8+3.9=5.18, as low-carbon synthesis gas.
[0028] As mentioned above, raw material gas is divided into low-carbon synthesis gas and high-carbon synthesis gas, of which low-carbon synthesis gas accounts for about 69% of the total gas volume, high-carbon synthesis gas accounts for about 31% of the total gas volume, and the total hydrogen-to-carbon ratio is about is 2.994. The feed gas pressure is 2.0MPa.
[0029] The methanation reaction process is as follo...
Embodiment 2
[0040] Synthesize natural gas with CO-rich raw material gas as raw material. For example, a typical composition of CO by-product in SiC production process is: CO 96.6%, sulfide 3.4%.
[0041] 84.7% of the total raw material gas is subjected to sulfur-resistant shift, decarburization, and desulfurization to obtain low-carbon synthesis gas (V%) with the following composition: H 2 : 89.0; CO: 8.8; CO 2 : 2.2
[0042] Desulfurize 15.3% of the above raw material gas to obtain a low-carbon synthesis gas (V%) with the following composition: CO: ~100. This is high carbon syngas.
[0043] The methanation reaction process is as follows:
[0044] (1) After all the low-carbon syngas has undergone heat exchange (temperature 240-260°C), steam (temperature 240-260°C), which accounts for about 15% of the low-carbon syngas flow rate, is added into the first-stage adiabatic reactor for methane Chemical reaction, the temperature of the gas flowing out of the reactor outlet is 670-680°C.
[0...
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Abstract
The invention discloses a method for producing synthetic natural gas, which belongs to the technical field of coal chemistry and new energy. The method for producing the synthetic natural gas comprises: dividing raw material gases from a general gas source into low-carbon synthetic gases with a hydrogen to carbon ratio, namely a (H2-CO2) to (H2+CO2) ratio, being 4.5 to 15.0 and high-carbon synthetic gases with a hydrogen to carbon ratio being 0 to 2.0; according to a reaction temperature requirement, mixing the low-carbon synthetic gases with steam at certain flow, allowing the mixed gases to enter a primary thermal-insulation reactor to undergo a methanation reaction, subjecting the gases from the primary thermal-insulation reactor to heat exchange, mixing the gases with the high-carbon synthetic gases at a certain flow, and allowing the newly mixed gases into a secondary thermal-insulation reactor to undergo a methanation reaction; repeating the previous process for several times; and finally, obtaining the synthetic natural gas by processes of heat exchange, cooling, drying, compression and the like. The method has the characteristics that: (1) circulating equipment is not used; (2) all reactions are performed in thermal-insulation reactors, multiple stages of reactors are connected in series, and the reaction space velocity is high; and (3) the hydrogen to carbon ratio of the whole reaction system can be regulated easily, and the methane content in the product gas may reach over 95 percent.
Description
technical field [0001] The invention relates to a method for producing synthetic natural gas, belonging to the technical fields of coal chemical industry and new energy. Background technique [0002] Natural gas is recognized as a clean energy, which is convenient to transport and use, and its consumption is increasing, while natural gas resources are becoming less and less. Using coal as raw material to produce synthetic natural gas (or substitute natural gas) through gasification, transformation, methanation and other processes is a very good supplementary method to the supply of natural gas, especially suitable for my country's "rich in coal, short of oil, and low in gas" resource endowment. [0003] The production of synthetic natural gas using coal as raw material is a relatively complex process technology for energy conversion. Currently, only the United States has an industrialized device in operation. The process technology includes: coal gasification, transformatio...
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