Method for purifying methane at low temperature

A purification method and biogas technology, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of complex process equipment, dangerous LNG, high economic scale threshold, and achieve the effect of flexible operation scale, simple process and reduced operation cost.

Inactive Publication Date: 2012-11-28
于政道
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Problems solved by technology

Among them, the chemical absorption method needs to consume a considerable amount of alkaline chemicals, and the operating cost is relatively high
In the organic solvent absorption method, although the absorption solvent can be regenerated, the process equipment is more complicated, the economic scale threshold is relatively high, professional and technical personnel are required to operate, and a certain amount of absorption solvent and energy consumption for regeneration will be lost during operation, which is not suitable. Features of biogas production with flexible scale
[0003] There is also a low-temperature liquefaction method for natural gas purification, but it generally refers to the removal of carbon dioxide and other components during the process of liquefying methane into LNG. The required process temperature is below -170°C, the input energy consumption is high, and it is not suitable for small and medium scale. Production
The LNG produced is dangerous and professional in terms of storage, and is generally only used in international natural gas trade and transportation.

Method used

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  • Method for purifying methane at low temperature
  • Method for purifying methane at low temperature

Examples

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Embodiment Construction

[0018] Such as figure 2 As shown, the biogas (CO 2 The content is about 40%, CH 4 The content is about 60%) pressurized to 25MPa by compressor 1, enters the low-temperature purification tower 2 through the recooler 3 (working pressure 25Mpa, working temperature -55°C, and can process an average of 70m of biogas per hour 3 / h,) at the top of the liquefied and precipitated liquid CO 2 discharged from the bottom, the purified CH 4 from liquid CO 2 It is discharged above the liquid level, and then enters the recooler 3, and after heat exchange with the treated biogas, the temperature rises to 10-15°C, and is discharged to the CNG storage bottle 4 at constant pressure. The main energy consumption of this device is the 7KW energy consumption of the refrigerator, and it is only necessary to monitor the refrigeration temperature and liquid CO during operation. 2 Liquid level, timed discharge of liquid CO 2 . An industrialized continuous purification method is provided for the ...

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Abstract

The invention relates to a method for purifying methane at low temperature and belongs to biomass energy utilization industry. According to the method, carbon dioxide in dehydrated and desulfurized methane is condensed into liquid and separated out under high pressure and at low temperature in a pure physical mode; and the purified high-pressure methane can directly enter a compressed natural gas (CNG) commodity circulation field. The purification accuracy of the purified methane obtained by the method can reach over 95 percent, the flow is simple, energy consumption and running cost are low, any adsorbent is not consumed, carbon dioxide with a food grade can be obtained, and the method has good economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of new energy, and relates to a method for purifying methane at low temperature. Background technique [0002] After the desulfurization and dehydration process of biogas, the main components of biogas are methane and carbon dioxide, and the purification of biogas mainly refers to the decarbonization process. The decarbonization and purification of biogas is actually very similar to the decarbonization technology of natural gas. The current mainstream decarbonization technologies mainly include solvent absorption method and chemical absorption method. Among them, the chemical absorption method needs to consume a considerable amount of alkaline chemicals, and the operating cost is relatively high. In the organic solvent absorption method, although the absorption solvent can be regenerated, the process equipment is more complicated, the economic scale threshold is high, professional and technical personnel a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 张百良徐桂转于政道刘翠红
Owner 于政道
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