Theoretical and experimental investigation on vertical tank technology for sinter waste heat recovery

Abstract

In the present work, the gas flow pressure drop and gas–solid heat transfer characteristics in sinter bed layer of vertical tank were studied experimentally on the basis of the homemade experimental setup. The gas flow pressure drop through the sinter bed layer was measured with different gas velocity and particle diameters, as well as the sinter and air temperatures. The influences of gas superficial velocity and particle diameter on the gas flow pressure drop and gas solid heat transfer in sinter bed layer were analyzed in detail. The revised Ergun’s correlation and gas solid heat transfer correlation were obtained according to the regression analysis of experimental data. It is found that, the pressure drop of unit bed layer height gradually increases as a quadratic relationship with increasing the gas superficial velocity, and decreases as an exponential relationship with the increase of sinter particle diameter. For a given sinter temperature, the heat transfer coefficient in sinter bed layer increases with increasing the gas superficial velocity, and increases with decreasing the sinter particle diameter. In addition, the heat transfer coefficient also gradually increases with increasing the sinter temperature at the same gas superficial velocity and sinter particle diameter. The mean deviations between the experimental data obtained from this work and the values calculated by the revised Ergun’s correlation and the experimental heat transfer correlation are 7.22% and 4.22% respectively, showing good prediction.

Keywords

sinter / waste heat / pressure drop / heat transfer coefficient / experimental study

References

[1] CaiJ-ju. The energy and resources saving technologies employed in Chinese iron and steel industry and their development [J]. World Iron Steel, 2009, 9(4): 1-13

[2] DongH, LinH-y, ZhangH-h, CaiJ-j, XuC-b, ZhouJ-wang. Thermal test and analysis of sintering cooling system [J]. Iron and Steel, 2011, 46(11): 93-98

[3] CaiJ-j, DongH, DuT, XuC-b, ZhouJ-w, LinKe. Study on grade recovery and cascade utilization of waste heat from sintering–cooling process [J]. Iron and Steel, 2011, 44(4): 88-92

[4] DongH, WangA-h, FengJ-s, ZhangQ, CaiJ-ju. Process and prospect in sintering waste heat resource recovery and utilization technology [J]. Iron and Steel, 2014, 49(9): 1-9

[5] DongH, ZhaoY, CaiJ-j, ZhouJ-w, MaG-yu. On the air leakage problem in sintering cooling system [J]. Iron and Steel, 2012, 47(1): 95-99

[6] MarceloR E, LuizF M. Thermodynamic analysis of a coke dry quenching unit [J]. Energy Conversion and Management, 2000, 41(2): 109-127

[7] CaiJ-j, DongHuiMethod and device of sinter waste heat recovery and utilization with vertical tank [P], 2009

[8] DongH, LiL, LiuW-j, WangB, SuoY-s, CaiJ-ju. Process of waste heat recovery and utilization for sinter in vertical tank [J]. China Metallurgy, 2012, 22(1): 6-11

[9] ErgunS. Fluid flow through packed columns [J]. Chemical Engineering Progress, 1952, 48: 89-94

[10] MacdonaldI F, El-SayedM S, MowK, DullienF A L. Flow through porous media—The Ergun equation revisited [J]. Industrial and Engineering Chemistry Research Fundamentals, 1979, 18(3): 199-208

[11] ComitiJ, RenaudM. A new model for determining mean structure parameters of fixed beds from pressure drop measurements: Application to beds packed with parallelepipedal particles [J]. Chemical Engineering Science, 1989, 44(7): 1539-1545

[12] OzahiE, GundogduM Y, CarpinliogluM Ö. A modification on Ergun’s correlation for use in cylindrical packed beds with non-spherical particles [J]. Advanced Powder Technology, 2008, 19(4): 369-381

[13] HicksR E. Pressure drop in packed beds of spheres [J]. Industrial and Engineering Chemistry Research Fundamentals, 1970, 9(3): 500-502

[14] TallmadgeJ A. Packed bed pressure drop—An extension to higher Reynolds numbers [J]. AIChE Journal, 1970, 16(6): 1092-1093

[15] MontilletA, AkkariE, ComitiJ. About a correlating equation for predicting pressure drops through packed beds of spheres in a large range of Reynolds numbers [J]. Chemical Engineering & Processing Process Intensification, 2007, 46(4): 329-333

[16] DietrichB. Heat transfer coefficients for solid ceramic sponges–Experimental results and correlation [J]. International Journal of Heat Mass Transfer, 2013, 61(6): 627-637

[17] GuptaN S, ChaubeR B, UpadhyayS N. Fluid–particle heat transfer in fixed and fluidized beds [J]. Chemical Engineering Science, 1974, 29(3): 839-843

[18] KamathP M, BalajiC, VenkateshanS P. Convection heat transfer from aluminium and copper foams in a vertical channel–An experimental study [J]. International Journal of Thermal Sciences, 2013, 64(2): 1-10

[19] CollierA P, HayhurstA N, RichardsonJ L, ScottS A. The heat transfer coefficient between a particle and a bed (packed or fluidised) of much larger particles [J]. Chemical Engineering Science, 2004, 59(21): 4613-4620

[20] PešicR, RadoicicT K, Boškovic-VragolovicN, ArsenijevicZ, Grbavcic. Heat transfer between a packed bed and a larger immersed spherical particle [J]. International Journal of Heat Mass Transfer, 2014, 78(11): 130-136

[21] RanzW E, MarshallW R. Evaporation from drops [J]. Chemical Engineering Progress, 1952, 48(3): 141-146

[22] GeldartD. Estimation of basic particle properties for use in fluid-particle process calculations [J]. Powder Technology, 1990, 60(1): 1-13

[23] DE KlerkA. Voidage variation in packed beds at small column to particle diameter ratio [J]. AIChE Journal, 2003, 49(8): 2022-2029

[24] FandR M, KimB Y Y, LamA C C, PhanR T. Resistance to the flow of fluids through simple and complex porous media whose matrices are composed of randomly packed spheres [J]. Journal of Fluids Engineering, 1987, 109(3): 268-274