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Grade improving method for methane with different qualities

A biogas and high-quality technology, applied in the field of environmental engineering, can solve the problems of high cost of adsorbents or equipment, inability to solve the purification problem, and insufficient stability of the effect, and achieve the effect of economical and efficient biogas grade, strong practicability, and convenient operation

Inactive Publication Date: 2013-04-03
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Their biggest drawbacks are: high cost of adsorbents or equipment, complex operation and maintenance, and unstable effects; they cannot solve the problem of purification of biogas slurry with high loads of pollutants from fermentation by-products; while improving the grade of biogas, new pollutants are produced

Method used

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  • Grade improving method for methane with different qualities

Examples

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Effect test

Embodiment 1

[0022] Example 1 A method for improving the grade of biogas of different qualities. Construct a multi-stage cascaded photoreactor system with a total of 12 stages, each with a size of 3 m×3 m×3 m; Chlorella sp. initial density 500 mg L -1 , the total volume of chlorella and biogas slurry is 1.0 m 3 , biogas volume 8.0 m 3 ; The photoperiod is 12 h / 12 ​​h, the control temperature of the system reactor is 30±0.5 °C, the working time of each reactor is 72 h, and natural light is used (the light intensity is about 300±100 μmol m -2 the s -1 ). Using CH 4 Gas bottles and CO 2 Gas bottle artificially simulates intake biogas CH 4 / CO 2 Volume ratio 3:7, 4:6, 5:5, 6:4 and 7:3. The results show that the intake biogas CH 4 / CO 2 When the volume ratio is 4:6, the improvement effect of biogas grade is the best. After the multi-stage series photoreactor system, the biogas grade can be raised to CH 4 90.55±5.85%, basically reaching the CH of biomethane gas 4 Content require...

Embodiment 2

[0023] Example 2 A method for improving the grade of biogas with different qualities. Construct a multi-stage cascaded photoreactor system with a total of 9 stages, each with a size of 5 m×4 m×3 m; inoculate the Cyanophyta anabaena Anabaena sp. Initial density 450 mg L -1 , the total volume of algae and biogas slurry is 10.0 m 3 , biogas volume 50.0 m 3 ; The photoperiod is 12 h / 12 ​​h, the control temperature of the system reactor is 25±0.5 °C, the working time of each reactor is 72 h, and the artificial light source is LED lamp white light (330 μmol m -2 the s -1 light intensity). Using CH 4 Gas bottles and CO 2 Gas bottle artificially simulates intake biogas CH 4 / CO 2 Volume ratios 3.0:7.0, 3.5:6.5, 4:6, 4.5:5.5 and 5.0:5.0. The results show that the intake biogas CH 4 / CO 2When the volume ratio is 3.5:6.5, the biogas grade is about CH 4 When the biogas grade is 35%, the effect of improving the biogas grade is the best. For actual biogas, the original bioga...

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Abstract

The invention belongs to the technical field of environment engineering, and particularly provides a grade improving method for methane with different qualities. The grade improving method comprises the following steps of: establishing a multilevel tandem-type photo-reactor system, vaccinating microalgae in reactors by taking biogas slurry as a culture medium, and gradually absorbing CO2 in the methane by virtue of the ultrahigh photosynthetic carbon fixation capability of microalgae so as to improve the grade of the methane; and optimizing most suitable CH4 / CO2 volume ratios of the methane with the different qualities, and controlling the CH4 / CO2 volume ratio of the methane entering in the reactor system to achieve an optimal methane grade improving effect. The method provided by the invention can fulfill the purpose of economically and efficiently improving the grade of the methane by controlling the CH4 / CO2 volume ratio of the methane; and meanwhile, a side product, namely a high-load pollutant biogas slurry, in fermentation can be further purified, and the proliferous microalgae further can be used for mixed anaerobic fermentation, so that new pollutants are almost not generated in a process of improving the grade of the methane. The grade improving method provided by the invention has the advantages of high practical applicability, high economical benefits, simplicity, and easiness and convenience in operation.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for improving the grade of biogas of different qualities. Background technique [0002] According to the different fermentation devices, operation methods and feed materials, the grade of biogas produced by fermentation is the combustible gas CH in biogas. 4 The volume content varies widely. It is generally believed that the composition of biogas (volume percentage) includes: CH 4 40%-75%, CO 2 15%-60%, water vapor 5%-10%, H 2 S 0.005%-2%, siloxane 0-0.02%, halogenated hydrocarbon VOC<0.6%, NH 3 <1%, O 2 0-1%, CO<0.6% and N 2 0-2%. When the combustible gas CH in biogas 4 The content must be at least higher than 60% before it can be burned; if the grade of biogas is further improved to reach the mark of biomethane (Biomethane), it is required to be higher than CH 4 95%-97% and lower than CO 2 1%-3%. For fermentation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/62C10L3/10C02F3/34C12N1/12
CPCY02E50/343Y02E50/30Y02P20/59Y02A50/20
Inventor 郑正颜诚张丽王东钱俊成
Owner FUDAN UNIV
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