The technological calculation for synergistic system of BF slag waste heat recovery and carbon resources reduction

Abstract In order to achieve the conversion and utilization of BF slag waste heat and CO 2 -rich industrial waste gas, a synergistic system was proposed. The methods of technological calculation and exergy analysis were conducted to determine the performance of the gasifier in the system using the coal/waste gas gasification reaction to recover the BF slag waste heat. Above 85% BF slag waste heat was recovered, and the exergy efficiency reached 78.38% in molten and granules slag gasifiers, and about 80% CO 2 was converted to syngas in the waste gas. In the coal/waste gas gasification process, the BF slag was used as heat carrier to guarantee the gasification reaction. The physical heat of the BF slag and chemical heat of coal were converted to the chemical and physical heat of syngas. The syngas physical heat was also recovered by heat exchanger to produce steam in the system. The waste heat of one ton BF slag at 1773 K was also calculated in the system consuming about 44.55 kg/t slag Datong coal, 146.12 m 3 /t slag industrial waste gas, and generated about 120 m 3 syngas. In the whole system, the BF slag waste heat was converted and utilized, and the CO 2 -rich waste gas was recycled. The energy consumption and CO 2 emission were decreased in iron and steel enterprise, so as to achieve the objective of energy saving and emission reduction.

[1]  Hong Wang,et al.  A review of waste heat recovery technologies towards molten slag in steel industry , 2013 .

[2]  Yuichi Moriguchi,et al.  CO2 in the iron and steel industry: an analysis of Japanese emission reduction potentials , 2002 .

[3]  Eiki Kasai,et al.  Feasibility of Rotary Cup Atomizer for Slag Granulation , 2001 .

[4]  Chunbao Xu,et al.  A brief overview of low CO2 emission technologies for iron and steel making , 2010 .

[5]  G. Bisio,et al.  Energy recovery from molten slag and exploitation of the recovered energy , 1997 .

[6]  Eiki Kasai,et al.  Rate of Methane-steam Reforming Reaction on the Surface of Molten BF Slag -for Heat Recovery from Molten Slag by Using a Chemical Reaction- , 1997 .

[7]  T. Akiyama,et al.  Integrated coal-pyrolysis tar reforming using steelmaking slag for carbon composite and hydrogen production , 2013 .

[8]  Zhihua Wang,et al.  Thermodynamic equilibrium analysis of hydrogen production by coal based on Coal/CaO/H2O gasification system , 2006 .

[9]  S. Channiwala,et al.  A UNIFIED CORRELATION FOR ESTIMATING HHV OF SOLID, LIQUID AND GASEOUS FUELS , 2002 .

[10]  N. H. Duc,et al.  CO2 capture by hydrate crystallization – A potential solution for gas emission of steelmaking industry , 2007 .

[11]  Qingbo Yu,et al.  Kinetics of CO2/Coal Gasification in Molten Blast Furnace Slag , 2012 .

[12]  Kj Krzysztof Ptasinski,et al.  From coal to biomass gasification: Comparison of thermodynamic efficiency , 2007 .

[13]  Abhoyjit S Bhown,et al.  Analysis and status of post-combustion carbon dioxide capture technologies. , 2011, Environmental science & technology.

[14]  David Michael Rowe,et al.  THERMOELECTRIC WASTE HEAT RECOVERY AS A RENEWABLE ENERGY SOURCE , 2006 .

[15]  Eiki Kasai,et al.  Thermodynamic Analysis of Thermochemical Recovery of High Temperature Wastes , 2000 .

[16]  Yoshiaki Kashiwaya,et al.  Development of a Rotary Cylinder Atomizing Method of Slag for the Production of Amorphous Slag Particles , 2010 .

[17]  T. Akiyama,et al.  Feasibility Study for Recovering Waste Heat in the Steelmaking Industry Using a Chemical Recuperator , 2004 .

[18]  V. R. Rustamov,et al.  Biomass conversion to liquid fuel by two-stage thermochemical cycle , 1998 .

[19]  Qingbo Yu,et al.  CO2 Gasification Rate Analysis of Datong Coal Using Slag Granules as Heat Carrier for Heat Recovery from Blast Furnace Slag by Using a Chemical Reaction , 2013 .

[20]  Qingbo Yu,et al.  Adaptability of Coal Gasification in Molten Blast Furnace Slag on Coal Samples and Granularities , 2011 .

[21]  Hadi Purwanto,et al.  Hydrogen production from biogas using hot slag , 2006 .

[22]  I. Janajreh,et al.  Thermodynamic equilibrium analysis of coal gasification using Gibbs energy minimization method , 2013 .

[23]  Hu Xian-Zhong.  Dry Granulation Experiment of Blast Furnace Slag by Rotary Cup Atomizer , 2009 .

[24]  Kanako Tanaka.  A comparison study of EU and Japan methods to assess CO2 emission reduction and energy saving in the iron and steel industry , 2012 .

[25]  S. Pushpavanam,et al.  Generalized Analysis of Gasifier Performance using Equilibrium Modeling , 2012 .

[26]  Chuijie Yi,et al.  Bio-oil production by pyrolysis of biomass using hot blast furnace slag , 2013 .

[27]  Sarah Broberg Viklund,et al.  Technologies for utilization of industrial excess heat: Potentials for energy recovery and CO2 emission reduction , 2014 .

[28]  Shan Qing,et al.  Characteristics of gaseous product from municipal solid waste gasification with hot blast furnace slag , 2010 .

[29]  Hadi Purwanto,et al.  Exergy, CO2 and Economical Analyses of the Hydrogen Production Using Waste Heat from Molten Slag in the Steel Industry , 2006 .

[30]  B. Shen,et al.  Study on MSW catalytic combustion by TGA , 2006 .

[31]  Zongliang Zuo,et al.  Thermodynamic analysis of hydrogen-rich gas generation from coal/steam gasification using blast furnace slag as heat carrier , 2014 .

[32]  Chuijie Yi,et al.  Hydrogen-rich gas production from biomass catalytic gasification using hot blast furnace slag as heat carrier and catalyst in moving-bed reactor , 2012 .