New method for assessing the performance of agricultural biogas plants

Djatkov, Djordje; Effenberger, Mathias; Lehner, Andreas F.; Martinov, Milan; Tešić, Miloš; Gronauer, Andreas

doi:10.1016/j.renene.2011.09.026

Cited by 23 publications

(12 citation statements)

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“…Calculated Rpr1 values from the KB biogas plant were mainly lower than results reported by Schievano et al 2011, but the calculated range of Rpr1 is within the range of their values. On the other hand, Djatkov et al 2012 have calculated even higher values for the relative biogas yield, 90-161%.…”

Section: Discussionmentioning

confidence: 98%

“…Cao & Pawlowski 2012 compared energy efficiency of sewage sludge pyrolysis to anaerobic digestion of sewage sludge followed by pyrolysis with a ratio of energy content of products to the higher heating value of dry material (HHVd) of the sludge. Djatkov et al 2012 rated the overall efficiency of biogas plant by combining the results of four aspects of the biogas plant performance: biogas production, biogas utilization, environmental impacts and socio-economic efficiency. Davis et al 2009 presented a fuel energy ratio (FER), a ratio of the fuel energy produced in relation to the used fossil fuel energy, which could be employed for defining energy efficiency.…”

Section: Energy Performance Evaluation Methods From the Literaturementioning

confidence: 99%

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Evaluation of methods for estimating energy performance of biogas production

et al. 2014

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This study focused on identifying various system boundaries and evaluating methods of estimating energy performance of biogas production. First, the output-input ratio method used for evaluating energy performance from the system boundaries was reviewed. Secondly, ways to assess the efficiency of biogas use and parasitic energy demand were investigated. Thirdly, an approach for comparing biogas production to other energy production methods was evaluated. Data from an existing biogas plant, located in Finland, was used for the evaluation of the methods. The results indicate that calculating and comparing the output-input ratios (Rpr1, Rpr2, Rut, Rpl and Rsy) can be used in evaluating the performance of biogas production system. In addition, the parasitic energy demand calculations (w) and the efficiency of utilizing produced biogas (η) provide detailed information on energy performance of the biogas plant. Furthermore, Rf and energy output in relation to total solid mass of feedstock (FO/TS) are useful in comparing biogas production with other energy recovery technologies. As a conclusion it is essential for the comparability of biogas plants that their energy performance would be calculated in a more consistent manner in the future.

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Section: Discussionmentioning

confidence: 98%

Section: Energy Performance Evaluation Methods From the Literaturementioning

confidence: 99%

Evaluation of methods for estimating energy performance of biogas production

et al. 2014

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“…By calculating a relatively small set of appropriate characteristic figures, the efficiency of biogas production and utilization systems can be described in quite a reliable and reproducible manner [104]. Also, using these characteristic figures, it is possible to set benchmarks for the state-of-the-art, and to compare and rank individual biogas plants [105]. The basic measuring equipment for determining the necessary performance figures includes at least the following: scale for all input materials; biogas analyzer and biogas flow meter in the supply pipe to the engine; electricity meters for the complete plant (plus for main individual consumers, possibly); operating hours counters for main components; heat meters for off-heat, digester heating and heat sales [106].…”

Section: Process Engineeringmentioning

confidence: 99%

Agricultural biogas production in Germany - from practice to microbiology basics

2014

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Worldwide, anaerobic digestion for sanitation and utilization of the produced biogas as energy carrier have a long-standing history. Concomitantly, digested residues from biogas plants are utilized as valuable fertilizers in crop production. In Germany, guaranteed prices for electricity generated from renewable sources pushed the number of biogas plants from about 140 in 1992 to about 7,720 by the end of 2013, and the share of electricity supply from biogas close to 4.5%. In the midterm, biogas is given considerable potential to fill up the residual load from electricity generation based on wind and photovoltaic. In this review, we give an overview of the state-of-the-art of biogas technology for energy supply from agricultural inputs, based mainly on the situation in Germany. Focus is placed on the monitoring and control (M&C) of biogas plants as a means of meeting the growing demands for productivity and reliability of biogas supply. We summarize prominent factors for the stability and productivity of the anaerobic digestion (AD) process, and present latest findings about molecular biology tools, bioindicators, the 'metabolic quotient' and cDNA/DNA ratios for process analysis. In view of the large diversity of agricultural biogas installations, we discuss the cost-benefit ratio of M&C effort and equipment. In the light of the transformation of the energy system in Germany towards renewable sources ('Energiewende'), we give an outlook on prospects and concepts for the future role of biogas technology in agriculture and energy supply. We also address recent misguided developments, as the sustainable development of biogas technology in agriculture can only be realized within the ecological, economical, and social boundaries of underlying agro-ecological systems.Keywords: Agriculture; Biogas production; Process control; Engineering; Microbiology; Molecular biology; Early-warning; Energy supply on demand ReviewThe most prominent beneficial features of the anaerobic digestion (AD) process are generation of biogas as a renewable energy carrier based on solar energy stored in biomass and hygienization of the input material during the treatment. Although it turns out from the following section that making use of hygienization is invaluable and has a long-standing history, the focus of this manuscript is on energy supply from biogas. The intent is to highlight the role of biogas production in a sustainable renewable energy framework in order to counteract consequences of the unsustainable resource management in the last century. Moreover, intensifying sustainable energy use has gained particular importance since the recent catastrophes with nuclear energy.This article builds on recent reviews by Weiland [1] and Braun et al. [2] on the state of biogas production in 2010, with emphasis on the development in Germany. In the last few years, the role of biogas as envisaged in the German renewable energy concept (see 'The role of biogas within the German energy supply system' section) has fuelled respective research a...

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“…2. The data from the biogas plants in operation from [43] are used to calibrate feedstock consumption for biogas production and realistic electricity and heat production. Heat demand of the digester might be modelled in more detail as a separate heat demand with seasonal effect [24].…”

Section: Case Study City Of Sabacmentioning

confidence: 99%

Smart municipal energy grid within electricity market

Bjelić

Rajaković

Duić

2017

Energy

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The user has requested enhancement of the downloaded file. ABSTRACTA smart municipal energy grid including electricity and heat production infrastructure and electricity demand response has been modelled in HOMER case study with goal to decrease total community yearly energy costs. The optimal configuration and sizing, with minimal costs, have been presented and compared using scenarios. Smart municipal energy grids will have an important role in future electricity markets. Their flexibility as participants in electricity markets is increased with possibility to utilize excess electricity production from CHP and variable renewable energy sources through heat storage. The costs and technical, economical and environmental benefits of smart municipal energy grids will be discussed followed with conclusion.

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New method for assessing the performance of agricultural biogas plants

Cited by 23 publications

References 6 publications

Evaluation of methods for estimating energy performance of biogas production

Evaluation of methods for estimating energy performance of biogas production

Agricultural biogas production in Germany - from practice to microbiology basics

Smart municipal energy grid within electricity market

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