Method and apparatus for separating CO2 in biogas based on hydrate process

A technology of hydrate and hydrate slurry, applied in gas fuel, petroleum industry, fuel and other directions, can solve the problems of large consumption of CH4, complicated process and high energy consumption, and achieve the advantages of reducing heat loss, uniform temperature and increasing contact area. Effect

Active Publication Date: 2015-03-11
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the energy consumption of the method of compression separation is relatively high, while the process of membrane separation method is relatively complicated, and at the same time, the CH 4 The consumption is also relatively large

Method used

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  • Method and apparatus for separating CO2 in biogas based on hydrate process
  • Method and apparatus for separating CO2 in biogas based on hydrate process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Take raw gas samples, where CH 4 The content is 60%, CO 2 The content is 40%, and the SDS aqueous solution with a mass concentration of 300ppm is selected. When the temperature of the reactor is 278K and the pressure is 5MPa, after 30 minutes of reaction, the CH in the gas phase of the reactor 4 content increased to 90.8%, CO 2 The content is 9.2%, and after another cycle, the CH in the gas phase of the reactor 4 The content is 97.1%, CO 2 The content is 2.9%.

Embodiment 2

[0047] Take raw gas samples, where CH 4 Content is 50%, CO 2 The content is 50%, and the TBAB aqueous solution with a mass concentration of 0.05% is selected. When the temperature of the reactor is 276K and the pressure is 3.5MPa, after 30 minutes of reaction, CH in the gas phase of the reactor 4 The content is 88.8%, CO 2 The content of CH is 11.2%. After the hydrate is decomposed, the raw material gas goes through 2 cycles, and the CH in the gas phase of the reactor 4 The content is 95.3%, CO 2 The content is 4.7%.

Embodiment 3

[0049] Take raw gas samples, where CH 4 Content is 40%, CO 2 The content is 59%, H 2 The S content is 1%, and the mixed aqueous solution of THF with a mass concentration of 1% and 100ppm of SDS is selected. The temperature of the reactor is 278K, and the pressure is 2.5MPa. After 1 hour of reaction, CH in the gas phase in the reactor 4 The content is 85.5%, CO 2 The content is 13.9%, H 2 With an S content of 0.6%, after 3 cycles, CH 4 The content is 95.2%, CO 2 The content is 4.2%, H 2 The S content is 0.4%.

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Abstract

The invention discloses a method and an apparatus for separating CO2 in biogas based on a hydrate process. The apparatus comprises a gas booster pump, a gas cooler, a hydrate reaction kettle, a hydrate slurry heater, a liquid booster pump, a liquid cooler, a gas chromatograph, a data acquisition and processing unit, valves and a pipeline; the hydrate reaction kettle is inside plated with a titanium layer for preventing more and more hydrate from being aggregated on the wall of the reaction kettle and solving the problems that a hydrate slurry in a hydrate separation gas is aggregated in the reaction kettle and circulation is not smooth; and the hydrate reaction kettle employs an outer jacket cooling and inner coil pipe cooling method, and also is coated with a thermal-insulation material layer at the outside, so that a large cooling environment in the hydrate reaction process is guaranteed, heat loss is reduced, and also the temperature in the hydrate reaction kettle is uniform. The apparatus structure is simple, the technology is relatively simple, more energy is saved, and the separation effect on biogas is relatively good.

Description

Technical field: [0001] The invention relates to the technical field of mixed gas separation, in particular to a method for separating CO from biogas based on a hydrate method. 2 method and device. Background technique: [0002] Biogas is a mixed gas produced by microbial fermentation of organic matter under anaerobic conditions. It generally contains 50-70% methane, and the rest is carbon dioxide and a small amount of nitrogen, hydrogen and hydrogen sulfide. Its characteristics are similar to natural gas, and it is a new energy source with great application prospects. Its development and utilization is an effective measure to solve the problem of rural energy supply under the energy shortage situation. Therefore, its development is increasingly valued by the country [0003] CO in biogas 2 , H 2 Acid gases such as S often have adverse effects in biogas utilization, so they need to be removed. At present, the commonly used methods for removing impurity gases from biogas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10
Inventor 臧小亚梁德青吴能友
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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