Parametric studies and effect of scale-up on wall-to-bed heat transfer characteristics of circulating fluidized bed risers

Patil, Ranjit S.; Pandey, Manmohan; Mahanta, Pinakeswar

doi:10.1016/j.expthermflusci.2010.11.012

Cited by 18 publications

(6 citation statements)

References 18 publications

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“…Thus, it indicates that operating conditions of CFB combustor had an essential impact on axial suspension density profile. That dependence was also confirmed by other authors [31][32][33][34].…”

Section: Resultssupporting

confidence: 87%

Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor

Błaszczuk¹

2015

Archives of Thermodynamics

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This paper focuses on assessment of the effect of flue gas recirculation (FGR) on heat transfer behavior in 1296t/h supercritical coal-fired circulating fluidized bed (CFB) combustor. The performance test in supercritical CFB combustor with capacity 966 MWth was performed with the low level of flue gas recirculation rate 6.9% into furnace chamber, for 80% unit load at the bed pressure of 7.7 kPa and the ratio of secondary air to the primary air SA/PA = 0.33. Heat transfer behavior in a supercritical CFB furnace between the active heat transfer surfaces (membrane wall and superheater) and bed material has been analyzed for Geldart B particle with Sauter mean diameters of 0.219 and 0.246 mm. Bed material used in the heat transfer experiments had particle density of 2700 kg/m3. A mechanistic heat transfer model based on cluster renewal approach was used in this work. A heat transfer analysis of CFB combustion system with detailed consideration of bed-to-wall heat transfer coefficient distributions along furnace height is investigated. Heat transfer data for FGR test were compared with the data obtained for representative conditions without recycled flue gases back to the furnace through star-up burners.

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Section: Resultssupporting

confidence: 87%

Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor

Błaszczuk¹

2015

Archives of Thermodynamics

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“…Eventually, the superficial gas velocity affected the total heat transfer coefficient. That dependence was also confirmed by Horio [38], Andersson [66], Patil et al [67], and also Kolar et al [68]. As can be seen in Fig.…”

Section: Bed-to-wall Heat Transfer Coefficient Distributionssupporting

confidence: 75%

A comparison of fuzzy logic and cluster renewal approaches for heat transfer modeling in a 1296 t/h CFB boiler with low level of flue gas recirculation

Błaszczuk¹,

Krzywański²

2017

Archives of Thermodynamics

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The interrelation between fuzzy logic and cluster renewal approaches for heat transfer modeling in a circulating fluidized bed (CFB) has been established based on a local furnace data. The furnace data have been measured in a 1296 t/h CFB boiler with low level of flue gas recirculation. In the present study, the bed temperature and suspension density were treated as experimental variables along the furnace height. The measured bed temperature and suspension density were varied in the range of 1131-1156 K and 1.93-6.32 kg/m 3 , respectively. Using the heat transfer coefficient for commercial CFB combustor, two empirical heat transfer correlation were developed in terms of important operating parameters including bed temperature and also suspension density. The fuzzy logic results were found to be in good agreement with the corresponding experimental heat transfer data obtained based on cluster renewal approach. The predicted bed-to-wall heat transfer coefficient covered a range of 109-241 W/(m 2 K) and 111-240 W/(m 2 K), for fuzzy logic and cluster renewal approach respectively. The divergence in calculated heat flux recovery along the furnace height between fuzzy logic and cluster renewal approach did not exceeded ±2%.

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“…In some studies [31,44] the heat transfer coefficient can be calculated by determining amount of heat supply using Eq. (5).…”

Section: Heat Transfer Coefficientmentioning

confidence: 99%

“…The pertinent data for the core heat transfer are available in Table 3 [39][40][41][42][43]. The operating parameters affecting the heat transfer process in CFBC with immersed surface can be summarized as: superficial gas velocity [31,33,39,[44][45][46][47], bed particles inventory [44], bed cross section [44], bed temperature [33,47], biomass share [48], suspension density [31,33,39,45,47], particle size [31,33,46,47], solid concentration [39,44,45,47,49], and immersed surface configuration [50].…”

Section: Heat Transfer Process In Circulating Fluidized Bed Combustormentioning

confidence: 99%

Heat transfer process in gas–solid fluidized bed combustors: A review

Abdelmotalib

Youssef

Ali

et al. 2015

International Journal of Heat and Mass Transfer

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Parametric studies and effect of scale-up on wall-to-bed heat transfer characteristics of circulating fluidized bed risers

Cited by 18 publications

References 18 publications

Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor

Effect of flue gas recirculation on heat transfer in a supercritical circulating fluidized bed combustor

A comparison of fuzzy logic and cluster renewal approaches for heat transfer modeling in a 1296 t/h CFB boiler with low level of flue gas recirculation

Heat transfer process in gas–solid fluidized bed combustors: A review

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