Fluidized‐Bed Reactors – Status and Some Development Perspectives

Werther, Joachim; Hartge, Ernst‐Ulrich; Heinrich, Stefan

doi:10.1002/cite.201400117

Cited by 16 publications

(8 citation statements)

References 50 publications

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“…Frequently, OSC has a low heating value due to its extremely high ash content, and additional energy input is required to sustain its stable disposal processes, e.g., combustion. For this reason, low‐rank fuels, such as brown coal (BC) and biomass, could be added to obtain a mixed fuel that has a relatively higher heating value and is easier to be ignited, just confirming the main trends of large‐size fluidized‐bed combustion observed by Werther et al 19. Assuming that the mixed fuel has a high nitrogen content (both OSC and BC contain a certain amount of nitrogen), controlling the NO x emission during combustion of the mixture is naturally indispensable.…”

Section: Introductionsupporting

confidence: 66%

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Shi

Qiao

Zhang

et al. 2022

Chemie Ingenieur Technik

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Ing. Joachim Werther on the occasion of his 80th birthdayFor developing technologies for innocent disposal of/energy recovery from high-ash oil sludge char (OSC), it was continuously combusted in a 10 kg h -1 fluidized-bed combustor. Addition of brown coal (BC) improved its combustion, but excessive BC was prone to cause slagging. Fine coke particles in OSC and volatiles in BC led to staged temperatures along the fluidized bed through air-staging co-combustion, enabling excellent combustion performance as well as efficient NO x reduction, especially when coupled with selective non-catalytic reduction. Thus, there is a potential to cleanly recover energy from OSC by its co-combustion with BC.

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Section: Introductionsupporting

confidence: 66%

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Shi

Qiao

Zhang

et al. 2022

Chemie Ingenieur Technik

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“…With further increasing the flow rate the bed begins to expand uniformly, reaching the fluidized condition [58]. The fluidized bed can be made by different materials, such as lava rock [59] or sulfur particles [60], but the most common is sand.…”

Section: Fluidized Bed Bioreactors (Fbbr)mentioning

confidence: 99%

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

et al. 2016

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Abstract:Municipal solid waste final disposal represents an environmental burden worldwide since landfilling, or open dumping, is still the preferred solution for the end of life of solid discarded materials. This study aims to review the technological innovations applied for landfill leachate treatment, taking into consideration the experiences obtained during the past years and the solutions which have been implemented. The review showed that both biological and physiochemical treatments are not able to achieve the requested water quality level, according to the limits established by regulations, whether applied in a single treatment or multiple treatments. In order to respect sustainable release limits to guarantee environmental protection, the construction of depuration systems and combining biological and physiochemical treatment methods is considered of the utmost importance. The review looks at possible joint applications of different treatment techniques reviewed by other studies and considers the state of the art of current research. Combined technical solutions suggested within the 2016 peer-reviewed papers are presented and discussed as a sustainable way to effectively treat landfill leachate, giving particular attention to feasible solutions for developing countries.

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“…Two simulation cases were performed by increasing the open area ratio of the central circular area (with half the diameter of the entire air distributor) from 10% to 15 and 20% while keeping the open area ratio of the remaining area at 10%. Such configuration is normally used to produce an ordered circulation of particles in applications such as the Wurster fluidized bed (Werther et al, 2014). The overall superficial air velocity was kept with a constant value of 1.7 m/s.…”

Section: Effect Of the Air Distributor On Particle Circulationmentioning

confidence: 99%

Numerical investigation of the particle circulation characteristics in a tapered fluidized bed

Che

Chen

2022

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PurposeThe objective of this study is to investigate several issues related to particle circulation within the TFB, including exploring an appropriate method to quantify particle circulation time, the effects of different operational parameters on particle circulation time, and the relationship between particle mixing and particle circulation.Design/methodology/approachThe computational fluid dynamics coupled with the discrete element method (CFD-DEM) is applied to investigate the particle circulation characteristics of a tapered fluidized bed (TFB). An approach for defining particle circulation, which accounts for the horizontal motion of each particle, is proposed to estimate particle circulation time.FindingsIt is found that the overall particle circulation in a TFB could be accelerated by increasing air velocity and wall inclination angle, while an increase in particle size and an increase in inter-particle cohesive forces decelerate particle circulation; the increase in the open area ratio of the central region of the air distributor would decelerate the particle circulation. Moreover, the particle circulation time and mixing rate are independent variables that describe the flow dynamics of particles from different perspectives.Practical implicationsA large part of fluidized beds in industrial applications can be classified as TFB. This study presents a numerical method to obtain detailed knowledge about particle circulation in a TFB, which is essential for the design, optimization, and control of related processes.Originality/valueThe particle circulation in a TFB is important but rarely investigated, and it is hard to be quantified using existing experimental approaches. The proposed numerical workflow reveals the characteristics of particle circulation from a particle-scale perspective.

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Fluidized‐Bed Reactors – Status and Some Development Perspectives

Cited by 16 publications

References 50 publications

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Co‐Combustion of Oil Sludge Char and Brown Coal in a Continuous Fluidized‐Bed Combustor

Novel and Conventional Technologies for Landfill Leachates Treatment: A Review

Numerical investigation of the particle circulation characteristics in a tapered fluidized bed

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