Heat Transfer of Alumina Sands in Fluidized Bed Combustor with Novel Circular Edge Segments Air Distributor

Shukrie, Ahmmad; Anuar, Shahrani; Alias, Afishah

doi:10.1016/j.egypro.2015.07.453

Cited by 6 publications

(3 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exhaust gas energy is first used to dry the sewage sludge until it reaches certain dryness range for efficient combustion. The incineration of sewage sludge in the fluidized bed incineration (FBI) systems enabled the energy required to dry the sludge and use the remaining energy in both district heating (DH) and low-temperature electricity generation [22][23][24][25][26][27]. Considering these energy recovery possibilities results from the FBI's low thermal efficiency, the accumulation of sewage sludge at the bottom of the FB, and high emissions.…”

Section: Electricity Production With An Orc Coupled To the Fluidized Bed Sewage Sludge Incineration (Fbssi) Plantmentioning

confidence: 99%

A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy

Abuşoğlu

Tozlu

Anvari‐Moghaddam

2022

International Journal of Thermodynamics

View full text Add to dashboard Cite

This paper presents the design, evaluation, and optimization of an electricity generation system based on the two-stage organic Rankine cycle (TS-ORC), which utilizes the waste heat of an existing fluidized bed sewage sludge incineration (FBSSI) facility. The facility incinerates an average of 300 tons per day of sewage sludge with a dry matter content of 22%. After the drying process, the sewage sludge is burned in a fluidized bed combustor, and exhaust gas at a temperature of about 850-900ºC is released due to the combustion. The system provides the energy required to dry the sludge from this exhaust gas. In this study, a TS-ORC is designed to be coupled to the exhaust gas flowlines discharged to the atmosphere at two different points in the FBSSI plant. The exergy efficiency of the FBSSI facility is found to be 70.5%. Three different working fluids are selected to examine the variations of thermodynamic and thermoeconomic performance parameters of the designed TS-ORC system. The highest power generation in the TS-ORC system (183.40 kW) is achieved using R1234yf as working fluid. R1234yf is also the most expensive fluid for electricity generation among the other working fluids (10.57 $/h). The least electricity generation in the TS-ORC (142.70 kW) occurs at the thermoeconomically most affordable cost with R245fa (9.35 $/h).

show abstract

Section: Electricity Production With An Orc Coupled To the Fluidized Bed Sewage Sludge Incineration (Fbssi) Plantmentioning

confidence: 99%

A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy

Abuşoğlu

Tozlu

Anvari‐Moghaddam

2022

International Journal of Thermodynamics

View full text Add to dashboard Cite

show abstract

“…The ratio of the opening area is =2 %. The circular edged distributor (see Figure 1(c)) from the previous work of Shukrie et al [18] was used in the simulation and experiment. The distributor consists of 8 air slots with 6.5 mm diameter and 29 mm long circular edged openings extended to the peripheral of the distributor.…”

Section: Numerical Model Descriptionmentioning

confidence: 99%

Computational and Experimental Study on Pressure Drop in a Fluidised Bed with Different Air Distributor Designs

Yudin¹,

Oumer²,

Roslan³

et al. 2020

IJAME

View full text Add to dashboard Cite

Fluidised bed combustion (FBC) has been recognised as a suitable technology for converting a wide variety of fuels into energy. In a fluidised bed, the air is passed through a bed of granular solids resting on a distributor plate. Distributor plate plays an essential role as it determines the gas-solid movement and mixing pattern in a fluidised bed. It is believed that the effect of distributor configurations such as variation of free area ratio and air inclination angle through the distributor will affect the operational pressure drop of the fluidised bed. This paper presents an investigation on pressure drop in fluidised bed without the presence of inert materials using different air distributor designs; conventional perforated plate, multi-nozzles, and two newly proposed slotted distributors (45° and 90° inclined slotted distributors). A 3-dimensional Computational Fluid Dynamics (CFD) model is developed and compared with the experimental results. The flow model is based on the incompressible isothermal RNG k-epsilon turbulent model. In the present study, systematic grid-refinement is conducted to make sure that the simulation results are independent of the computational grid size. The non-dimensional wall distance, is examined as a key factor to verify the grid independence by comparing results obtained at different grid resolutions. The multi-nozzles distributor yields higher distributor pressure drop with the averaged maximum value of 749 Pa followed by perforated, 45° and 90° inclined distributors where the maximum pressure drop recorded to be about one-fourth of the value of the multi-nozzles pressure drop. The maximum pressure drop was associated with the higher kinetic head of the inlet air due to the restricted and minimum number of distributor openings and low free area ratio. The results suggested that low-pressure drop operation in a fluidised bed can be achieved with the increase of open area ratio of the distributor.

show abstract

“…Choi et al [4] performed numerical simulation of uniformizing the non-uniform flow in a two-dimensional channel with non-uniform porosity distribution in a wide range of parameter variation. Shukrie et al [5] studied a novel circular edge segments air distributor for the fluidized bed combustor. Thermochemical and flow dynamic processes in catalytic converters were studied by Guojiang et al [6] and Agrawal et al [7] using numerical simulation method.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flow Distribution in the Packed Bed Reactor with the Supply Nozzle Placed on the Sidewall

Yakovlev

Zambalov

Skripnyak

2017

KEM

View full text Add to dashboard Cite

Flow distribution is an important process step of many technologies such as heating or cooling systems, microchannel reactors, bubble columns and fixed- or fluidized-bed reactors etc. The present work is devoted to numerical simulation of flow distribution in the pre-reactor unit of the packed bed reactor used for filtrating combustion of fuel mixtures. A special modification of the construction is considered namely the construction with a nozzle for fuel mixture supply placed on the sidewall of the apparatus. The problem formulation, the best practices and opportunities of numerical simulation of the flow distribution effect in packed bed reactors are discussed in the present paper. The length of the flow distribution zone in a wide range of mixture inlet velocity is calculated.

show abstract

Heat Transfer of Alumina Sands in Fluidized Bed Combustor with Novel Circular Edge Segments Air Distributor

Cited by 6 publications

References 14 publications

A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy

A Two-Stage ORC Integration to an Existing Fluidized Bed Sewage Sludge Incineration Plant for Power Production in the Scope of Waste-to-Energy

Computational and Experimental Study on Pressure Drop in a Fluidised Bed with Different Air Distributor Designs

Numerical Simulation of Flow Distribution in the Packed Bed Reactor with the Supply Nozzle Placed on the Sidewall

Contact Info

Product

Resources

About