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  Journal of Water and Land Development (1)
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Assessment of the flow of substrate and agricultural biogas through the adhesive skeleton bed in phenomenological and numerical terms

Grzegorz Wałowski

Archives of Thermodynamics | 2021 | vol. 42 | No 3 | 243-253 | DOI: 10.24425/ather.2021.138118

Słowa kluczowe pig slurry agricultural biogas Adhesive bed permeability CFD

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Abstrakt

The paper reviews selected methods of agricultural biogas production and characterizes their technical and technological aspects. The conditions of the anaerobic fermentation process in the reactor with adhesive skeleton bed were analyzed. The required technological criteria for the production of biogas from a substrate in the form of pig slurry were indicated. As part of experimental studies, evaluation of the biogas replacement resistance coefficient and the permeability coefficient as a function of the Reynolds number were made. The method of numerical simulation with the use of a tool containing computational fluid dynamics codes was applied. Using the turbulent flow model – the RANS model with the enhanced wall treatment option, a numerical simulation was carried out, allowing for a detailed analysis of hydrodynamic phenomena in the adhesive skeleton bed. The paper presents the experimental and numerical results that allow to understand the fluid flow characteristics for the intensification of agricultural biogas production.

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Bibliografia

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[15] Wałowski G.: Interpretation of the mechanism of biogas flow through an adhesive bed in analogy to gas-permeability for a structural model of a porous material. Int. J. Curr. Res. 10(2018), 12, 76225–76228.
[16] Wałowski G.: Multi-phase flow assessment for the fermentation process in monosubstrate reactor with skeleton bed. J. Water Land Dev. 42(2019), 7-9, 150–156.
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Autorzy i Afiliacje

Grzegorz Wałowski

e-mail:

ORCID:

Institute of Technology and Life Sciences, Falenty, Department of Renewable Energy, Poznań Branch, ul. Biskupińska 67, 60-463 Poznań, Poland

Assessment of polydisperse substrate flow in a fermentor for computational fluid dynamics modelling

Grzegorz Wałowski

Journal of Water and Land Development | 2022 | Special Issue | 1-7 | DOI: 10.24425/jwld.2022.143715

Słowa kluczowe Adhesive bed agricultural biogas autocyclic flow bioreactor computational fluid dynamics (CFD) Klinkenberg phenomenon

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Abstrakt

In this paper study results of selected production methods for agricultural biogas are shown and technical and technological aspects of these methods are described for monosubstrate bioreactors. Based on the available literature, modelling of mixing in bioreactors using computational fluid dynamics (CFD) was is demonstrated. As part of the research, the numerical simulation method was used with a tool that contains CFD codes. The model k-ε is used to simulate the mean flow characteristics under turbulent flow conditions. This is a two-equation model that gives a general description of turbulence. The work presents the results of numerical studies that make it possible to understand the characteristics of fluid flow in the adhesive bed used for the production of agricultural biogas. The tests showed that in the core of the adhesive bed there is a flow of 0.19 m∙s ^–1, while in the outer part of the bed there is a flow in the range 0.01–0.02 m∙s ^–1. Taking into account the substrate inflow of 0.17 m∙s ^–1 (in the upper part of the fermentor), it was observed that the Klinkenberg effect for autocyclic movement (from bottom to top) takes place. The novelty in the article is the observation of the dominant flow in the core of the bed and the autocyclic flow in the opposite direction in the peripheral areas of the adhesive bed.

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Autorzy i Afiliacje

Grzegorz Wałowski

e-mail:

ORCID:

Institute of Technology and Life Sciences – National Research Institute, Falenty, al. Hrabska 3, 05-090 Raszyn, Poland