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A method and device for efficiently purifying biogas using the principle of pressure swing adsorption

A pressure swing adsorption, biogas technology, applied in gas fuel, waste fuel, petroleum industry and other directions, can solve the problems of high energy consumption, low efficiency of biogas purification, large volume and so on

Inactive Publication Date: 2021-05-14
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the existing technology, the process structure of purifying biogas by using the principle of pressure swing adsorption is relatively complicated, which makes the corresponding equipment bulky and high energy consumption; at the same time, the efficiency of biogas purification is low and the effect is poor

Method used

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  • A method and device for efficiently purifying biogas using the principle of pressure swing adsorption
  • A method and device for efficiently purifying biogas using the principle of pressure swing adsorption
  • A method and device for efficiently purifying biogas using the principle of pressure swing adsorption

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Embodiment 1

[0031] Embodiment 1: A method for efficiently purifying biogas using the principle of pressure swing adsorption, comprising the following steps:

[0032] S1, pretreatment;

[0033] S11. Pass the biogas produced after anaerobic fermentation into the desulfurization tower 1, and use the desulfurizer in the desulfurization tower 1 to remove the sulfide in the biogas. The desulfurizer is a commercially available biogas desulfurizer;

[0034] S12. Pass the biogas desulfurized in step S11 into the drying tower 2 to remove the moisture in the desulfurized biogas so that the water content of the desulfurized biogas is 2 mg / kg to obtain dry biogas; the desiccant used in the drying tower 2 is commercially available Silica gel desiccant sold;

[0035] S13, pass the dried biogas obtained in step S12 into the filter tower 3 to remove insoluble impurities in the dried biogas; adjust the pressure of the outlet gas from the filter tower 3 to 0.5MPa to obtain compressed biogas; the filter mem...

Embodiment 2

[0041] Embodiment 2: A method for efficiently purifying biogas by using the principle of pressure swing adsorption, comprising the following steps:

[0042] S1, pretreatment;

[0043] S11. Pass the biogas produced after anaerobic fermentation into the desulfurization tower 1, and use the desulfurizer in the desulfurization tower 1 to remove the sulfide in the biogas. The desulfurizer is a commercially available biogas desulfurizer;

[0044] S12. Pass the biogas desulfurized in step S11 into the drying tower 2 to remove the moisture in the desulfurized biogas so that the water content of the desulfurized biogas is 6 mg / kg to obtain dry biogas; the desiccant used in the drying tower 2 is commercially available Silica gel desiccant sold;

[0045] S13, pass the dried biogas obtained in step S12 into the filter tower 3 to remove insoluble impurities in the dried biogas; adjust the pressure of the outlet gas from the filter tower 3 to 0.8MPa to obtain compressed biogas; the filter ...

Embodiment 3

[0051] Embodiment 3: A method for efficiently purifying biogas by using the principle of pressure swing adsorption, comprising the following steps:

[0052] S1, pretreatment;

[0053] S11, pass the biogas produced after anaerobic fermentation into the desulfurization tower 1, and use the desulfurizer in the desulfurization tower 1 to remove the sulfide in the biogas. In step S11, the desulfurizer is composed of the following raw materials by weight: organic amine desulfurizer 15 parts, 8 parts of sulfoxide, 1 part of polyethylene glycol, 5 parts of propylene carbonate, and 20 parts of deionized water. The desulfurizer under this ratio has a longer service life, thereby reducing the frequency of replacement of the desulfurizer. Improve economic benefits; the preparation method of the desulfurizer is: mix and react the organic amine desulfurizer with sulfoxide and polyethylene glycol, control the reaction pH value to 6, and generate colloidal precipitate; use the colloidal preci...

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Abstract

The invention discloses a method for efficiently purifying biogas by using the principle of pressure swing adsorption, including pretreatment, passing the biogas generated after anaerobic fermentation into a desulfurization tower, a drying tower and a filter tower in sequence for pretreatment, using the desulfurization tower to The desulfurization agent in the biogas removes sulfides, the desiccant in the drying tower dehydrates the biogas, and the filter element of the filter tower removes insoluble large particles of impurities in the biogas; pressure swing adsorption, the compressed biogas is passed into the first stage In the adsorption tower, the CO in the compressed biogas is depleted by the purified adsorbent filled in the primary adsorption tower. 2 Adsorption is carried out to obtain primary purified biogas, which is then passed into the secondary adsorption tower to absorb CO again 2 Obtain purified biogas; desorption regeneration, when the CO adsorbed in the primary adsorption tower 2 When it reaches saturation, vacuumize the primary adsorption tower and the secondary adsorption tower to make the CO 2 Gas desorption and release; the process design of the invention is reasonable, the biogas purification efficiency is high, and it is suitable for mass promotion.

Description

technical field [0001] The invention relates to the technical field of biogas purification, in particular to a method and device for efficiently purifying biogas by utilizing the principle of pressure swing adsorption. Background technique [0002] Biogas is a combustible mixed gas produced by microorganisms. Its main component is methane, with a content of about 50-75%, followed by 25-45% carbon dioxide, and other gases, such as hydrogen sulfide, carbon monoxide, nitrogen, water vapor, oxygen, etc. Biogas purification is mainly to remove hydrogen sulfide, carbon dioxide, sulfur dioxide, halogenated mixed gases and siloxane in biogas. Pressure swing adsorption is an important process for the purification of biogas to natural gas. Pressure swing adsorption refers to the process of separation, purification and regeneration of the mixture gas at a certain temperature through the cycle process of pressure adsorption and decompression or normal pressure desorption or flushing re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10
CPCC10L3/103C10L3/104C10L3/106Y02E50/30
Inventor 牛晓君王竹婷吕梦雨郭华芳唐志华刘敏茹林璋张冬青张荔
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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