Computational fluid dynamics modeling of rice husk combustion in a fluidised bed combustor

Rozainee, M.; Ngo, S. P.; Salema, Arshad Adam; Tan, K. G.

doi:10.1016/j.powtec.2010.05.026

Cited by 27 publications

(11 citation statements)

References 19 publications

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“…For RH, it shows good agreement with previous results [38] for elemental composition (fixed carbon (FC), volatile matter (VM), ash (A) content, carbon (C), hydrogen (H), and oxygen (O)), with differences <10%. We also compared the results with several reported in previous studies [39][40][41][42] 1 shows that composites (RH) x (PB) 1-x (x = (0.9, 0.7, 0.5)) reveal homogeneous samples; all elemental composition is increased gradually with increasing PB content for an element with higher content in PB, and vice versa.…”

Section: Resultsmentioning

confidence: 66%

New composites based on low-density polyethylene and rice husk: Elemental and thermal characteristics

Anshar¹,

Tahir

Makhrani

et al. 2018

Environmental Engineering Research

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We developed new composites by combining the solid waste from Low-Density Polyethylene in the form of plastic bag (PB) and biomass from rice husk (RH),in the form of (RH)x(PB)1-x (x = (1, 0.9, 0.7, 0.5)), as alternative fuels for electrical energy sources, and for providing the best solution to reduce environmental pollution. Elemental compositions were obtained by using proximate analysis, ultimate analysis, and X-ray fluorescence spectroscopy, and the thermal characteristics were obtained from thermogravimetric analysis. The compositions of carbon and hydrogen from the ultimate analysis show significant increases of 20-30% with increasing PB in the composite. The activation energy for RH is 101.22 kJ/mol; for x = 0.9 and 0.7, this increases by 4 and 6 magnitude, respectively, and for x = 0.5, shows remarkable increase to 165.30 kJ/mol. The range of temperature of about 480-660°C is required for combustion of the composites (RH)x(PB)1-x (x = (1, 0.9, 0.7, 0.5)) to perform the complete combustion process and produce high energy. In addition, the calorific value was determined by using bomb calorimetry, and shows value for RH of 13.44 MJ/kg, which increases about 30-40% with increasing PB content, indicating that PB has a strong effect of increasing the energy realized to generate electricity.

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Section: Resultsmentioning

confidence: 66%

New composites based on low-density polyethylene and rice husk: Elemental and thermal characteristics

Anshar¹,

Tahir

Makhrani

et al. 2018

Environmental Engineering Research

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“…The work may be extended to 3D gas-solid flows increase in the solid particle temperature 4. There is no significant difference for drag models, all three drag models are suitable for predicting the hydrodynamics of gas-solid flows Rozainee et al (2010) 1. It was observed that the operating conditions giving 1.…”

Section: Main Observations Main Resultsmentioning

confidence: 99%

Study of a 30 MW bubbling fluidized bed combustor based on co-firing biomass and coal

Kumar

Mohapatra

Singh

2015

Sadhana

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Today's power generation sources are largely dependent on fossil fuels due to which the future sustainable development has become a challenge. A significant amount of the pollutant emissions such as carbon dioxide, carbon monoxide and nitrogen oxide from the power sector is related to the use of fossil fuels for power generation. As the demand for electricity is growing rapidly, emissions of carbon dioxide and other pollutants from this sector can be expected to increase unless other alternatives are made available. Among the energy sources that can substitute fossil fuels, biomass fuels appear as one of the options with a high worldwide potential. In the Punjab region of India, Fluidized-bed combustion technology is being used for converting biomass into thermal energy and power generation in various small scale units. The investigation of biomass-based plant through experimental activities and numerical simulation is the scope of this study. The investigations were done at Captive Power Plant (CPP), Ambuja Cement Limited, a project of Holcim, District Ropar, India. During experimental investigations, the study of bed temperatures and steam temperatures at different zones has been done for coal fired and biomass fired combustors with 30% share. No clear effects of co-firing on boiler performance are observed. However, the operational behavior of the boiler in terms of bed temperature and stack emissions shows a different trend. During simulation, the contours of temperature have been obtained for both the boilers and the trends are found in agreement with real process.

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“…Mekanisme kerja Fluidized Bed Combustion menurut Rozzainee dkk. [4] adalah udara primer disemburkan oleh blower dari bawah ruang pembakaran, lalu udara sekunder membawa bahan bakar padat masuk ke dalam sisi samping ruang pembakaran, sementara burner terpasang di sisi samping berdekatan dengan udara primer. Selanjutnya bahan bakar padat terbakar oleh burner.…”

Section: Fluidized-bed Combustionunclassified

Studi Fluidisasi dan Pembakaran Batubara Polydisperse di Dalam Fluidized Bed Berbasis Simulasi CFD (Computational Fluid Dynamic)

2018

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Penelitian ini bertujuan untuk mengetahui fenomena pembakaran batubara dimana dimensi alat, distribusi ukuran partikel, dan jenis kualitas batubara menggunakan validasi dari penelitian Wang. Penelitian ini mengarahkan pada simulasi berbasis CFD. Kondisi operasi pada saat simulasi pembakaran dilakukan pada kecepatan bubbling. Metode yang digunakan sebelum melakukan simulasi pembakaran merupakan kelanjutan dari simulasi fluidisasi dimana masih menggunakan geometri 2-D fluidized bed lalu dilakukan meshing, selanjutnya memasukkan persamaan energi. Geometri fluidized bed yang digunakan berbentuk tabung dengan panjang silinder fluidized bed 1370 mm, diameter silinder 152 mm. Bahan yang digunakan pada penelitian ini berupa pulverized coal dengan jenis batubara Bituminous dimana ukuran partikel dianggap polydisperse dengan ukuran partikel 1 mm dan 1,86mm yang masing-masing sebesar 50% fraksi massa dengan kecepatan 0,2 Kg/s dan suhu 1200 K, dan udara luar yang diinjeksikan dengan kecepatan 0,8 m/s dan suhu 300 K. Analisa pengambilan data adalah berupa kontur fase padatan, kontur temperatur pada fase-1 dan fase padatan, fraksi massa produk pembakaran, massa padatan awal dan akhir simulasi dengan time step sebesar 0,0001 detik dan number of time step sebesar 300000. Selanjutnya data tersebut diplot menjadi grafik temperatur terhadap time step dan disajikan dalam setiap 1 menit simulasi selama 5 menit simulasi.This research aims to determine coal combustion’s phenomenon, where the device’s dimension, particle size distribution, and the quality of rank coal which validated Wang’s reseach. This reseach leads on CFD simulation. The operation condition has did in bubbling velocity. This method is a continuation from fluidization simulation which is use 2-D Geometry and then used the meshing method, and enter the energy equation. The geometry of fluidized bed used was tubular cylinder with 1370 mm length and 152 mm. Materials used in this study was pulverized coal with Bituminous coal type which the particle size was considered as monodispers with particle size was 1.43 mm and polydispersed with particle size was 1 mm with 50% mass fraction and 1.86 mm with 50% mass fraction with flow rate 0,2 Kg/s and the temperature is 1200 K, and the outside air are injected in 0,8 m/s and 300 K. The analysis of data retrieval is solid phase contour, temperature contours in phase-1 and solid phase, mass fraction of combustion product, initial solid mass and final solid mass simulation with time step 0,0001 s and the numberof time step 300000. Then the data is plotted into a graph temperature vs time step and presented in 1 minute simulation for 5 minute simulation.

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Computational fluid dynamics modeling of rice husk combustion in a fluidised bed combustor

Cited by 27 publications

References 19 publications

New composites based on low-density polyethylene and rice husk: Elemental and thermal characteristics

New composites based on low-density polyethylene and rice husk: Elemental and thermal characteristics

Study of a 30 MW bubbling fluidized bed combustor based on co-firing biomass and coal

Studi Fluidisasi dan Pembakaran Batubara Polydisperse di Dalam Fluidized Bed Berbasis Simulasi CFD (Computational Fluid Dynamic)

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