Co-combustion of biomass and gaseous fuel in a novel configuration of fluidized bed: Thermal characteristics

Okasha, F.; Zaater, G.; El-Emam, Salah H.; Awad, M. M.; Zeidan, El-Shafei B.

doi:10.1016/j.enconman.2014.04.069

Cited by 13 publications

(6 citation statements)

References 55 publications

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“…Combustion of biomass is characterized by post-combustion in the freeboard region. ,, To avoid this shortcoming, a new fluidized-bed configuration, namely the jetting-fountain configuration, developed by Okasha, − has been applied. This paper presents an experimental investigation of the effects of air-staging on the combustion of rice straw in the jetting-fountain fluidized bed.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Emissions Reduction and Combustion Processes for Biomass in a Fluidized Bed

2014

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The present paper reports on an experimental study on staged-air combustion of rice-straw pellets in a new fluidized-bed configuration. The conventional method and the staged-air technique of secondary air feeding are applied for comparison. The results confirm that the new fluidized bed is more effective in controlling NO x for all considered operating conditions. SO2 emission exhibits reduction at lower secondary air; however, it increases at higher ratio for the conventional method. With the new configuration, the concentration of exhausted SO2 decreases as the amount of secondary air increases. The results also show that CO emission does not change with the amount of secondary air for the new configuration, while it increases as the amount of secondary air increases in the conventional method. With the conventional method, fixed carbon loss tends to decrease at lower secondary air ratios while combustion efficiency suffers a decrease at higher values. Alternatively, in the case of the new configuration, fixed carbon loss steadily decreases while combustion efficiency improves monotonically as the amount of secondary air increases.

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Section: Introductionmentioning

confidence: 99%

Enhancing Emissions Reduction and Combustion Processes for Biomass in a Fluidized Bed

2014

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“…At present, researchers pay much attention to studying combustion from oil palm biomass, because it is more efficient and economical [1][2][3][4]. Fluidized-bed technology has proven to be the most effective in transforming various types of palm oil biomass into a renewable and sustainable energy [5][6][7][8][9][10]. Biomass fuels from various oil-palm composites are more efficient and economical than coal biomass.…”

Section: Introductionmentioning

confidence: 99%

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Hani

Mahidin

Husin

et al. 2020

ARFMTS

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One of the technologies that can be used to meet energy needs is biomass combustion. In this study, the oil palm biomass fuels used were empty fruit bunches, oil palm fibers, oil palm midribs, and palm kernel shells. This research was carried out by a direct combustion method using a fluidized-bed combustor. The purpose of this experiment was to investigate the reaction of kinetics and the mechanism of combustion of oilpalm biomass in fluidized-bed combustor. The characteristics observed in this test were the combustion temperature profile, flue-gas composition, and the composition of the ash-deposit chemical compound. The results of the experiments conducted showed that the best biomass combustion temperature profile was recorded at 2 kg biomass with an air flow rate of 0.9375 m 3 /s at 90.1%. The maximum temperature of biomass combustion recorded at biomass 3 kg with an air flow rate of 1.25 m 3 /s are 950 o C (95%). The higher conversion combustion of biomass was found at biomass condition of 3 kg with an air flow rate of 0.9375 m 3 /s. The value of O2 emissions from biomass combustion shows that it was very small 0.2%. While the highest CO2 value was recorded at 19.9%. The highest combustion efficiency on FBC found 1 kg of biomass fuel with an air flow rate of 0.0654 m 3 /s recorded 94.9%.

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“…The aim of the present work is to apply a novel configuration of fluidized bed, namely, jetting fountain fluidized bed (JFFB) in oxidation process of chemical looping combustion. JFFB was proposed by Okasha and presented in many articles [35][36][37][38][39][40][41]. JFFB is characterized by excellent gas-solids contact due to creating a jet in the upper part of the bed, establishing a fountain in the freeboard and moderating bubbles size in the main bed.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Oxidation Process in Chemical Looping Combustion Applying Jet Fountain Fluidized Bed. (Dept. M ( Power ) )

Jawdat

Ahmed

Okasha

2020

Bulletin of the Faculty of Engineering. Mansoura University

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Chemical-Looping Combustion (CLC) has emerged as a very promising combustion technology for power plants and industrial applications with inherent CO 2 capture. CLC avoids the energetic penalty present in other competing technologies. The technology basis is to transfer oxygen from air to the fuel by means of a solid oxygen-carrier avoiding direct contact between fuel and air. It consists of two successive reactions, oxidation and reduction, in two interconnected fluidized beds. The aim of the current work is to enhance the oxidation process by applying jetting fountain fluidized bed. A jetting fountain fluidized bed reactor has been designed, fabricated and installed to carry out the experimental work. It has 105 mm ID and 4000 mm height. Activated ilmenite has been used as oxygen carrier. During the tests atmospheric air is fed through an ilmenite bed that reacts with oxygen. The oxygen concentrations are measured after the bed to estimate the quantities of oxygen that combined with bed materials. The influences of operating conditions including bed temperature, fluidization velocity, jet air ratio and jet orifice height on the process effectiveness have been studied. The findings of the present work indicate that the jetting fountain fluidized bed is more effective in ilmenite oxidation where the oxidation conversion rate increases and the time required for full conversion reduces. Applying jetting fountain configuration enhances gas solids contact and improves the interphases mass exchange between bubbles and emulsion. The oxidation conversion rate was found to improve with bed temperature and fluidization velocity. On the other side, studying the influences of jet air ratio and jet orifice height demonstrate that there is an intermediate value at which the oxidation process records an optimal.

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Co-combustion of biomass and gaseous fuel in a novel configuration of fluidized bed: Thermal characteristics

Cited by 13 publications

References 55 publications

Enhancing Emissions Reduction and Combustion Processes for Biomass in a Fluidized Bed

Enhancing Emissions Reduction and Combustion Processes for Biomass in a Fluidized Bed

Experimental Studies on Combustion Characteristics of Oil-Palm Biomass in Fluidized-Bed: A Heat Energy Alternative

Enhancing Oxidation Process in Chemical Looping Combustion Applying Jet Fountain Fluidized Bed. (Dept. M ( Power ) )

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