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Parameter regulation and control method applied in stepped upgrading system of biogas grade

A technology for upgrading systems and biogas, applied in the field of environmental engineering, can solve the problems of affecting the working time of the system, difficult to achieve the effect of improving the quality of the system, affecting the economy of the system, etc., and achieve the effect of improving the benefits.

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

AI Technical Summary

Problems solved by technology

The gas-liquid ratio determines the amount of biogas that can be processed at one time in a fixed-volume reactor. If the gas-liquid ratio is too high, the improvement effect of the biogas grade may be reduced, and if the gas-liquid ratio is too low, the biogas processing capacity of the system will be reduced. reduce the efficiency of the system
The number of series series determines the construction cost and operation complexity of the system, and at the same time affects the working time of the entire system; when there are too many series series, it will affect the economy of the system, and when the number of series is too small, it may be difficult to achieve the required grade Enhancement effect

Method used

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  • Parameter regulation and control method applied in stepped upgrading system of biogas grade

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Embodiment 1

[0017] A parameter control strategy applied to a step-by-step biogas grade upgrading system. The size of the single-stage device of the step-by-step biogas grade upgrading system is 2 m×2 m×2.5 m; Chlorella sp.; the photoperiod is 12 h / 12 ​​h; the temperature of the system reactor is controlled at 30±0.5 °C; natural light is used, and the light intensity is about 300±50 μmol m -2 the s -1 . Parameters that need to be optimized and adjusted: the gas-liquid ratio is set to 10:1, 9:1, 8:1, 7:7, and 6:1; the number of series stages is set to 8, 9, 10, and 11; The residence time was set to 24 h, 48 h, 72 h and 96 h; the initial microalgae inoculum was set to 80 mg L -1 , 200 mg L -1 , 400 mg L -1 and 800 mg L -1 . The original intake biogas grade is CH 4 50.93±12.74%, after optimizing the parameters of the step-by-step biogas grade improvement system, the final parameter control strategy is: the gas-liquid ratio is 8:1; the number of stages in series is 10; the residence...

Embodiment 2

[0019] A parameter control strategy applied to a step-by-step biogas grade upgrading system. The size of the single-stage device of the step-by-step biogas grade upgrading system is 3 m×3 m×3 m; inoculated with Cyanophyta Anabaena Anabaena sp.; the photoperiod is 12 h / 12 ​​h; the temperature of the system reactor is controlled at 25 ± 0.5 °C; the artificial white LED lamp is used, and the light intensity is 250 ± 10 μmol m -2 the s -1 . Parameters that need to be optimized and adjusted: the gas-liquid ratio is set to 10:1, 9:1, 8:1, 7:7, and 6:1; the number of series stages is set to 8, 9, 10, and 11; The residence time was set to 24 h, 48 h, 72 h and 96 h; the initial microalgae inoculum was set to 80 mg L -1 , 200 mg L -1 , 400 mg L -1 and 800 mg L -1 . The original intake biogas grade is CH 4 42.53±8.14%, after optimizing the parameters of the step-by-step biogas grade improvement system, the final parameter control strategy is: the gas-liquid ratio is 9:1; the ...

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Abstract

The invention belongs to the field of environment engineering technology, and specifically relates to a parameter regulation and control method applied in a stepped upgrading system of biogas grade. The stepped upgrading system of the biogas grades is composed of a plurality of photobioreactors connected in series, and the biogas stays for a certain time in each stage reactor before entering the next reactor, so that the biogas grade is increased step by step. In each stage reactor, biogas slurry is used as a nutritional matrix to inoculate microalgaes which is used for absorbing CO2 in the biogas so as to increase relative content of CH4, so that the biogas grade is increased. A gas-liquid ratio, a series number, a biogas stay time (a reacting time of the biogas and the microalgaes in each stage reactor) and an initial inoculation amount of the microalgaes are four key parameters of the stepped upgrading system of the biogas grade, so that efficiency of the whole system can be increased by optimizing regulation and control strategies of the four parameters.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a parameter control method applied to a step-by-step biogas grade improvement system. Background technique [0002] In rural areas of our country, the low grade of biogas is an important factor restricting the development of biogas technology. Combustible components CH in general biogas 4 It can only reach 40%-75% of the content, while the rest is 15%-60% CO 2 , 5%-10% water vapor and other trace gases. When the combustible gas CH in biogas 4 When the content reaches 60%, it has combustion value; CH 4 The content reaches 95%-97%, CO 2 Only when the content is lower than 1%-3%, can it meet the standard of biomethane. A step-by-step biogas grade improvement system is adopted, which is composed of multiple photobioreactors in series; each stage of reactor uses biogas slurry to grow algae, and uses the super photosynthetic carbon fixation ability ...

Claims

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Application Information

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IPC IPC(8): C10L3/10C12N1/12C12R1/89
Inventor 郑正颜诚张丽王东钱俊成
Owner FUDAN UNIV
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