Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Guo, Pei Quan; Zhou, Jiri; Ma, Rongjiang; Yu, Nanyang; Yuan, Yanping

doi:10.3390/en12101960

Cited by 20 publications

(8 citation statements)

References 30 publications

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“…Alternatively, the solid fraction of the separated fume cupboard can be used as a substrate for methane fermentation, as described by [44]. Additionally, in [45], the digested material was separated with a decanter centrifuge for solid-liquid separation to increase the biogas yield.…”

Section: Discussionmentioning

confidence: 99%

Biomass Energy Technologies from Innovative Dairy Farming Systems

et al. 2021

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Modern and innovative dairy cattle breeding technologies are highly dependent on the level of mechanization. This article presents modern solutions for dairy cattle breeding, in particular, for livestock buildings, in which longitudinal development is possible in accordance with the farm’s needs as well as with obtaining additional energy from biogas and post-ferment for granulated organic fertilizer. In the analysed technology for milk production, methane fermentation, biogas yield, and the possibility of fertilizer production in the form of granules are considered. The presented modular cattle breeding technology includes sustainable production, which is economic; environmentally friendly, with preconditions in the facility including animal welfare; and socially acceptable, resulting from a high level of mechanization, which ensures both comfortable working conditions and high milk quality. The presented production line is an integral part of the milk production process with the possibility of organic fertilizer being used in the production of healthy food.

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Section: Discussionmentioning

confidence: 99%

Biomass Energy Technologies from Innovative Dairy Farming Systems

et al. 2021

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“…According to a number of researchers [32,33], the variations in CH 4 production and emissions from biogas plants have been correlated to the slurry temperature. In this study, the slurry temperature in the autumn was higher than that in the winter.…”

Section: Seasonal Variation Of Gas Compositionmentioning

confidence: 99%

Effects of Seasonal Temperature Variation on Slurry Temperature and Biogas Composition of a Commercial Fixed-Dome Anaerobic Digester Used in Bangladesh

et al. 2021

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Biogas is produced in Bangladesh mostly through fixed-dome anaerobic digesters, which usually operate without any temperature controller. An experiment was conducted to monitor the seasonal temperature variation inside a fixed-dome type digester and its effect on biogas composition. A commercial-scale digester with a working volume of 350 m3 was used for this study. Three k-type thermocouple sensors were used to monitor the ambient, biogas, and slurry temperatures in real-time. The results showed that the average ambient temperature in the autumn, late autumn, and winter was 29.05, 22.90, and 17.64 °C, respectively. The average slurry temperature in the autumn (30.38 °C) was higher than in the late autumn (29.36 °C) and in the winter (25.76 °C). The highest and lowest slurry temperatures were found to be 31.11 and 24.47 °C, respectively, which indicated that the digester worked within a wide temperature range, establishing both psychrophilic and mesophilic operational conditions. Higher methane concentrations were observed in the autumn than in the late autumn and winter. The CO2 and H2S concentrations were higher in the winter than those of in the autumn and late autumn. The electricity generation in the winter was 47.85% and 45.15% lower than in the autumn and late autumn, respectively.

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“…International Journal of Photoenergy where Q demand represents the heat duty of the dynamic anaerobic digestion system (in kW), Q 1 represents the heat required for heating the biomass digestive fluid (in kW), and Q 2 represents the heat loss from the MFD and slurry tank (in kW). The specific calculation process is described in [19].…”

Section: System Operating Modesmentioning

confidence: 99%

“…where EER represents the energy efficiency ratio of the system; Q input represents the input energy of the system, [19].…”

Section: Operating Energy Consumption Analysis Of Differentmentioning

confidence: 99%

“…As shown in Figure 1, a 12 m 3 multiphase flow digester (MFD) dynamic digestion system was heated by a biogas boiler near a pig farm at Suining City, Sichuan Province, China [19]. Full-scale field experiments were conducted on the biogas production rate of the system at different temperatures, as well as the dynamic digestion effects and dynamic heating digestion effects of the system.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Heating System of Multiphase Flow Digester by Solar-Untreated Sewage Source Heat Pump

Guo

Zhou

et al. 2020

International Journal of Photoenergy

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The traditional biogas heating system has the disadvantages of a low energy efficiency ratio and high energy consumption. In this study, a solar-untreated sewage source heat pump system (SUSSHPS) was developed for heating a 12 m3 multiphase flow digester (MFD) in Suining, China. To investigate the operating effects, two modes were defined according to the solar fractions in different regions. On the basis of experimental data, thermodynamic calculations and operating simulation analysis were performed, and the solar collector area (Ac) and the minimum length of the sewage double-pipe heat exchanger (lmin) for the two modes were calculated. The results indicated that the Ac and lmin of mode 2 were larger than those of mode 1 at different solar fractions. Additionally, the results suggested that mode 1 can be used at a solar fraction of <0.33, and mode 2 can be used at a solar fraction of >0.5. Moreover, a comprehensive evaluation of different biogas heating systems was performed. Two evaluation methods were used for modeling calculations, and the results of the two methods were consistent. The SUSSHPS had the largest comprehensive evaluation value among the four systems. The proposed SUSSHPS can play a significant role in improving current biogas heating systems and promoting the development of biogas projects.

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Biogas Production and Heat Transfer Performance of a Multiphase Flow Digester

Cited by 20 publications

References 30 publications

Biomass Energy Technologies from Innovative Dairy Farming Systems

Biomass Energy Technologies from Innovative Dairy Farming Systems

Effects of Seasonal Temperature Variation on Slurry Temperature and Biogas Composition of a Commercial Fixed-Dome Anaerobic Digester Used in Bangladesh

Dynamic Heating System of Multiphase Flow Digester by Solar-Untreated Sewage Source Heat Pump

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