Integration of biomass/steam gasification with heat recovery from hot slags: Thermodynamic characteristics

Sun, Yongqi; Zhang, Zuotai; Liu, Huan; Wang, Xidong

doi:10.1016/j.ijhydene.2016.02.110

Cited by 25 publications

(7 citation statements)

References 37 publications

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“…Meanwhile, it was necessary to obtain the gas species and slag-phase species in the process of coal gasification with molten BFS using the method of Gibbs free energy. On the basis of the results by Sun et al, 33 the formed gas species and slag-phase species in the gasification process were identified and shown in Tables 2 and 3, respectively.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Comprehensive Analysis of the Coal Particle in Molten Blast Furnace Slag To Recover Waste Heat

Duan

Wang³

2017

Energy Fuels

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In this paper, molten blast furnace slag was used as a heat carrier to make the coal gasification reaction run smoothly. The characteristics of coal particle motion, heat transfer, and gasification reaction in molten slag were investigated in detail. It could be divided into four forms of coal particles in molten slag, and the coal particle could move across the bubble when the velocity and diameter of coal particle were 4.20 m s–1 and 75 μm, respectively. Meanwhile, with the coal particle motion, a large amount of waste heat of molten slag transferred it to ensure the process of the gasification reaction. The slag could enhance the heating rate of the coal particle, promote the gasification reaction, and increase the carbon conversion rate. Molten slag was also beneficial to the syngas production, which improved the fraction of CO and enhanced the combustible gas component in the process of coal/CO2 gasification. Moreover, the problem of sulfide emission in the coal gasification process was solved effectively using molten blast furnace slag as the heat carrier. The total sulfide emission decreased dramatically from 0.21 to 0.04 mol kgcoal –1. Overall, not only was waste heat of molten slag recovered by this method, but also the quality of coal gasification and reduced hazardous gas emissions improved.

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Section: Energy and Fuelsmentioning

confidence: 99%

Comprehensive Analysis of the Coal Particle in Molten Blast Furnace Slag To Recover Waste Heat

Duan

Wang³

2017

Energy Fuels

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“…Peak hydrogen formation is usually around an equivalence ratio of 3 and the present work has rich flames propagating with a relatively high reactivity for equivalence ratio >3. Both pyrolysis and gasification of biomass can result in hydrogen production [5,7,8] and the pulverised biomass propagating flame studied in the present work involve pyrolysis reactions due to flame heating of particles. For rich mixtures gasification reactions occur that produce hydrogen.…”

Section: Biomass and Hydrogen Productionmentioning

confidence: 99%

Raw and steam exploded pine wood: Possible enhanced reactivity with gasification hydrogen

Saeed

Andrews

Phylaktou

et al. 2016

International Journal of Hydrogen Energy

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A commercial thermally treated biomass known as 'steam exploded biomass' or 'black pellets' was compared with the raw yellow pine wood feedstock to the process using the Hartmann dust explosion equipment. The aim was to investigate the difference in pulverised biomass reactivity and minimum explosible concentration, MEC. The reactivity was determined from the initial rate of pressure rise prior to the vent bursting in the Hartmann equipment. The flame speed in the vertical tube of the Hartmann equipment was also determined as a reactivity parameter. Steam exploded milled pellets (BP) was found to have a higher reactivity, leaner MEC and higher flame speed, than the raw pine. The enhanced reactivity of BP was due to the greater proportion of fine particles. Both raw pine and BP had a high reactivity for very rich mixtures and this was due to the gasification reactions in rich mixtures that released CO and hydrogen. The very lean MEC for both biomass also may have been enhanced by hydrogen release.

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“…The results implied that granulated BF slag had a positive effect on the bio-oil reforming process, but the positive effect was insignificant, particularly at low temperatures. Additionally, Sun investigated the equilibrium productions of biomass gasification [33] and biomass pyrolysis [3] in the slag, also proving that slag had a little effect on the hydrogen yield and equilibrium production.…”

Section: Introductionmentioning

confidence: 99%

The Thermodynamic Characterizations of Hydrogen Production from Catalyst-Enhanced Steam Reforming of Bio-Oil over Granulated Blast Furnace Slag as Heat Carrier

et al. 2023

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To promote the efficiency of waste heat recovery from granulated blast furnace (BF) slag, a novel method of catalyst-enhanced steam reforming of bio-oil to recover heat from slag is proposed. CaO is utilized as a superior catalyst for the process of catalyst-enhanced steam reforming. The thermodynamic production of the catalyst-enhanced steam reforming of bio-oil in granulated BF slag is obtained using HSC 6.0 software. The optimal conditions are mainly assessed according to the hydrogen yield, hydrogen concentration and carbon production. Through the thermodynamic production and industrial application, the temperature of 608 °C, S/C of eight and pressure of 1 bar are found as the optimal conditions. At the optimal conditions, the hydrogen yield, hydrogen concentration and carbon production are 95.25%, 76.89% and 0.28 mol/kg, respectively. Taking the temperature of 625 °C, S/C of eight and pressure of 1 bar as an example, the catalyst could improve the hydrogen yield and hydrogen concentration from 93.99% and 70.31% to 95.15% and 76.49%, respectively. It is implied that utilizing the catalyst could promote the hydrogen yield and hydrogen concentration of steam reforming of bio-oil to recover waste heat from granulated BF slag. The mechanism of catalyst-enhanced steam reforming of bio-oil to recover waste heat from granulated BF slag is obtained to guide the subsequent industry application.

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Integration of biomass/steam gasification with heat recovery from hot slags: Thermodynamic characteristics

Cited by 25 publications

References 37 publications

Comprehensive Analysis of the Coal Particle in Molten Blast Furnace Slag To Recover Waste Heat

Comprehensive Analysis of the Coal Particle in Molten Blast Furnace Slag To Recover Waste Heat

Raw and steam exploded pine wood: Possible enhanced reactivity with gasification hydrogen

The Thermodynamic Characterizations of Hydrogen Production from Catalyst-Enhanced Steam Reforming of Bio-Oil over Granulated Blast Furnace Slag as Heat Carrier

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