Efficiency testing of three biogas siloxane removal systems in the presence of D5, D6, limonene and toluene

Kajolinna, Tuula; Aakko-Saksa, Päivi; Roine, Johannes; Kåll, Leif

doi:10.1016/j.fuproc.2015.06.042

Cited by 23 publications

(7 citation statements)

References 6 publications

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“…For example, removal efficiency of 90 % was achieved by purging sewage sludge with air at 80 °C for 48 hours (flow rate of 0.5 dm 3 •min -1 ) [21]. Siloxanes dissolve in organic solvents such as toluene, acetone, xylem, suggesting the possibility of their removal from biogas by absorption methods [22]. At temperatures below freezing and under reduced pressure, some of the compounds present in biogas condense and can be separated.…”

Section: Introductionmentioning

confidence: 99%

Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP

Konkol

Cebula

Bohdziewicz

et al. 2020

Ecological Chemistry and Engineering S

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The biogas produced in municipal wastewater-treatment plants (WWTP) should be cleaned before it can be used as a fuel in internal combustion engines. Efficient running of such engines is possible only subject to using high quality biogas and lubricating oil. Otherwise, biogas impurities in course of complex chemical reactions may form deposits on various engine parts as well as seriously contaminate the lubricating oil. In this paper, mineral deposits containing high concentration of bismuth, silicon, sulphur, calcium and zinc are studied. Silicon deposits demonstrating strong friction properties are formed during combustion of volatile silica compounds. As these deposits build up, abrasion problems, ignition failure and even engine failure result. The bismuth containing deposits comes from bearings degradation, zinc and calcium were derived from the additives present in commercially available lubricating oil, while lead, aluminium, copper, nickel, iron and chromium were introduced by engine wear phenomena. The highest bismuth content was located at the engine cylinder heads and the lowest at the exhaust elements, whereas highest calcium content was registered on the pistons. Silicon containing deposits are highest in the exhaust and lowest at the engine head. Zinc deposits are highest at the piston.

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Section: Introductionmentioning

confidence: 99%

Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP

Konkol

Cebula

Bohdziewicz

et al. 2020

Ecological Chemistry and Engineering S

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“…[8] Gases, such as siloxanes, are commonly removed by the AC adsorption technique. [66,67] Besides AC, the method of H 2 S removal by catalytic oxidation of TiO 2 -coated carriers and ultraviolet (UV) radiation is widely studied, with efficiencies as high as 99%. [9] Membranes have a high potential for CO 2 removal because the gas has a linear molecular geometry and higher permeability than CH 4 with a tetrahedral molecular geometry.…”

Section: Impurity Impactsmentioning

confidence: 99%

Updates on biogas enrichment and purification methods: A review

et al. 2022

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The market for biogas production has been increasing every year all over the world. The use of biogas as an energy vector is accomplished through the most diverse applications, such as direct burning (thermal energy), internal combustion engines, and fuel cells. Besides direct applications, biogas can be used as a raw material for producing high added-value products, such as molecular hydrogen and renewable hydrocarbons, through a new enterprise concept, the biorefineries. Purity and quality control are determinant factors that enable the decision-making regarding the end use of biogas. Physical, chemical, and biological methods can be used in biogas upgrading processes as well as a combination of different techniques. This review aims to deepen the knowledge about relevant technologies for biogas purification. It also addresses the most efficient and feasible methods, challenges to be overcome, and main demands for future studies. Therefore, the presentation, in a detailed way, of the synergistic effects caused by components contained in natural biogas and the combinatorial methods for removing these contaminants, differentiates this from other works that approach only the purification techniques but do not point out their problems and causes more comprehensively. Thus, studies related to the combined effects of contaminants would be interesting in future works.

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“…Due to its relatively high methane content and calorific value, biogas has been widely investigated as a renewable energy source for heating and power generation [ 3 , 4 ]. However, siloxanes, present at low concentrations in biogas, can compromise the operation of biogas-to-energy facilities, presenting technical challenges for its widespread use [ 5 ]. During combustion, siloxanes such as hexamethyldisiloxane (L2) and octamethylcyclotetrasiloxane (D4) can form white deposits (SiO 2 ) on critical components, decreasing their performance and increasing the costs of maintenance and operation [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Materials currently used to reduce siloxanes in biogas include high efficiency adsorbents such as activated carbon, silica and molecular sieves [ 5 , 11 , 12 , 13 ]. While these adsorbents are relatively low cost, simple to use [ 14 , 15 , 16 ] and high in adsorption capacity, their adsorption cycle performances are limited, restricting their practical applications.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

Hou

Zheng

et al. 2021

Molecules

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To expand the applications of graphene-based materials to biogas purification, a series of reduced graphene oxide aerogels (rGOAs) were prepared from industrial grade graphene oxide using a simple hydrothermal method. The influences of the hydrothermal preparation temperature on the textural properties, hydrophobicity and physisorption behavior of the rGOAs were investigated using a range of physical and spectroscopic techniques. The results showed that the rGOAs had a macro-porous three-dimensional network structure. Raising the hydrothermal treatment temperature reduced the number of oxygen-containing groups, whereas the specific surface area (SBET), micropore volume (Vmicro) and water contact angle values of the rGOAs all increased. The dynamic adsorption properties of the rGOAs towards hexamethyldisiloxane (L2) increased with increasing hydrothermal treatment temperature and the breakthrough adsorption capacity showed a significant linear association with SBET, Vmicro and contact angle. There was a significant negative association between the breakthrough time and inlet concentration of L2, and the relationship could be reliably predicted with a simple empirical formula. L2 adsorption also increased with decreasing bed temperature. Saturated rGOAs were readily regenerated by a brief heat-treatment at 100 °C. This study has demonstrated the potential of novel rGOA for applications using adsorbents to remove siloxanes from biogas.

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Efficiency testing of three biogas siloxane removal systems in the presence of D5, D6, limonene and toluene

Cited by 23 publications

References 6 publications

Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP

Mineral Deposit Formation in Gas Engines During Combustion of Biogas from Landfills and Municipal WWTP

Updates on biogas enrichment and purification methods: A review

The Effects of Hydrophobicity and Textural Properties on Hexamethyldisiloxane Adsorption in Reduced Graphene Oxide Aerogels

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