Gasification of cotton crop residues for combined power and biochar production in Mozambique

Allesina, Giulio; Pedrazzi, Simone; Allegretti, Francesco; Morselli, Nicolò; Puglia, Marco; Santunione, Giulia; Tartarini, Paolo

doi:10.1016/j.applthermaleng.2018.04.115

Cited by 52 publications

(24 citation statements)

References 23 publications

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“…For the generator to output electricity with a constant frequency of 50 Hz, it also has an engine governor to ensure that the engine turns at 1500 rpm (synchronous generator with four poles) while varying the power output to match the load on the generator. Further details about the pilot-scale integrated gasification power production system and its equipment can be found elsewhere [32,34,35].…”

Section: Pilot-scale Downdraft Reactormentioning

confidence: 99%

Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor

et al. 2019

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The first part of the current reported work presents experimental results of brewers’ spent grains gasification in a pilot-scale downdraft gasifier. The gasification procedure is assessed through various process characteristics such as gas yield, lower heating value, carbon conversion efficiency, and cold gas efficiency. Power production was varied from 3.0 to 5.0 kWh during the gasification experiments. The produced gas was supplied to an internal combustion engine coupled to a synchronous generator to produce electricity. Here, 1.0 kWh of electricity was obtained for about 1.3 kg of brewers’ spent grains pellets gasified, with an average electrical efficiency of 16.5%. The second part of the current reported work is dedicated to the development of a modified thermodynamic equilibrium model of the downdraft gasification to assess the potential applications of the main Portuguese biomasses through produced gas quality indices. The Portuguese biomasses selected are the main representative forest residues (pine, eucalyptus, and cork) and agricultural residues (vine prunings and olive bagasse). A conclusion can be drawn that, using air as a gasifying agent, the biomass gasification provides a produced gas with enough quality to be used for energy production in boilers or turbines.

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Section: Pilot-scale Downdraft Reactormentioning

confidence: 99%

Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor

et al. 2019

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“…The efficiency of the overall process varies from 40% in simple designs to roughly 75% in processes which are well designed [41]. Allesina et al [45] indicate that cotton residue gasification represents the basis for local circular economy models.…”

Section: Gasificationmentioning

confidence: 99%

Bioenergy Recovery from Cotton Stalk

Afif¹,

Pfeifer²,

Pröll³

2020

Advances in Cotton Research

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Cotton stalk (CS) plant residue left in the field following harvest must be buried or burned to prevent it from serving as an overwintering site for insects such as the pink bollworm (PBW). This pest incurs economic costs and detrimental environmental effects. However, CS contains lignin and carbohydrates, like cellulose and hemicelluloses, which can be converted into a variety of usable forms of energy. Thermochemical or biochemical processes are considered technologically advantageous solutions. This chapter reviews potential energy generation from cotton stalks through combustion, hydrothermal carbonization, pyrolysis, fermentation, and anaerobic digestion technologies, focusing on the most relevant technologies and on the properties of the different products. The chapter is concluded with some comments on the future potential of these processes.

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“…Biochar is a low-cost carbonaceous material derived from the thermal conversion of various biomasses using techniques such as gasification [32], pyrolysis [33][34][35][36], hydrothermal carbonisation [37] and torrefaction [38], at temperatures ranging from 300 to 900°C and in oxygen-limiting environments. High pyrolysis temperatures in the carbonisation of biomass (>500°C) lead to high surface areas, microporosity and a biochar that is highly hydrophobic in nature [33,37].…”

Section: Nature Sources and Production Of Biocharmentioning

confidence: 99%

“…A selection of typical biochar feedstocks and the associated compositions of their respective biochars, after formation, are outlined in Table 3. Typically biochars have been produced from woody-type wastes [32,33], manures [37,38], agricultural wastes [36] and energy crops such as alfalfa [34] and miscanthus [39]. Biochars derived from wood or crop wastes typically tend to show higher surface areas, whereas animal waste and activated sludge-derived biochars tend to exhibit lower surface areas.…”

Section: Nature Sources and Production Of Biocharmentioning

confidence: 99%

Advances in Metal Recovery from Wastewaters Using Selected Biosorbent Materials and Constructed Wetland Systems

Murnane¹,

Ghanim²,

O’Donoghue³

et al. 2019

Water and Wastewater Treatment

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An expanding global population not only increases the amounts of municipal solid waste and wastewater generated but also raises demand for a wide range of raw materials used to manufacture goods. Extraction of these raw materials and many subsequent manufacturing processes contribute significantly to the presence of a variety of metals in wastewaters and leachates. Metal-rich wastewaters not only result in short-and long-term environmental and associated health concerns but also have potential economic value if the metals can be recovered. In this chapter, we review the effectiveness of biochar, microbial and lignin biosorbents as well as constructed wetland systems to remove soluble metals from wastewaters. The wide variation in adsorptive capacity of these biosorbent materials reflects the heterogeneous nature of the source materials used for their production. Physical and chemical modifications of biochars and lignins generally improve their adsorptive capacities which remain highly variable. Constructed wetlands are attractive because of their passive nature with low-energy and low-maintenance requirements, although their long-term capacity to treat metal-rich wastewaters is as yet largely undetermined. Future perspectives focus on increasing the selectivity of adsorbents to remove complex matrices of metals from wastewaters and on increasing their adsorption/desorption capacities.

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Gasification of cotton crop residues for combined power and biochar production in Mozambique

Cited by 52 publications

References 23 publications

Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor

Experimental and Modeling Analysis of Brewers´ Spent Grains Gasification in a Downdraft Reactor

Bioenergy Recovery from Cotton Stalk

Advances in Metal Recovery from Wastewaters Using Selected Biosorbent Materials and Constructed Wetland Systems

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