Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal

Li，Fenghai1,2,3; Zhao，Wei2; Li，Junguo4; Fan，Hongli1; Xu，Meiling1; Han，Guopeng1; Guo，Mingxi1; Wang，Zhiqing3; Huang，Jiejie3; Fang，Yitian3

2023-04-01

10.1016/j.energy.2023.126699

ENERGY   影响因子和分区

0360-5442

1873-6785

To explore the effects of phosphogypsum (PG) on coal ash fusion characteristics, the ash fusion temperature (AFT) modifications of two coals (Xiaolongtan coal (XLT) and Jiaozuo coal (JZ)) by PG addition, and their mechanisms under a reducing atmosphere were analyzed. With increasing PG mass ratio, the AFT of mixed XLT increased, while the AFT decreased for JZ mixtures. To meet the liquid-slag-discharge requirement during entrained-flow gasification, the PG suitable mass ratios were 4.9%–8.9% and 6.5%–9.0% for XLT and JZ, respectively. The different AFT variations resulted from the changes in its base/acid ratio ((CaO + MgO + NaO + KO + FeO + SO)/(AlO + SiO + PO)). With PG addition, the decreasing relative low melting-point (MP) CaAlSiO and increasing high-calcium minerals (e.g., CaAlSiO, CaSiO, CaPSiO, and CaMgSiO) caused the mixed AFT to increase for high-calcium XLT; decreasing high-MP AlSiO and increasing CaAlSiO content caused the mixed AFT for high silicon−aluminum JZ to decrease. The AFT variation might also be explained by the variations in the temperature range (between the appearance of liquid-phase and all minerals complete change into the liquid-phase) and ash composition positions of XLT or JZ mixtures in the SiO–AlO–CaO ternary phase diagram with increasing PG mass ratio.

Ash fusion characteristics Modification behaviors Phosphogypsum (PG) Regulation mechanism

SCI ; EI

英语

其他

Natural Science Foundation of China[21875059] ; Natural Science Foundation of Shandong Province, China["ZR2018MB037","ZR2021MB011"]

Thermodynamics ; Energy & Fuels

Thermodynamics ; Energy & Fuels

WOS:000923730000001

PERGAMON-ELSEVIER SCIENCE LTD

20230413415505

Alumina ; Aluminum oxide ; Calcium ; Calcium compounds ; Gypsum ; Hematite ; Magnesia ; Silica ; Silicon ; Silicon oxides ; Slags ; Sodium compounds

Minerals:482.2 ; Solid Fuels:524 ; Alkaline Earth Metals:549.2 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2

ENGINEERING

2-s2.0-85146449548

Scopus

1.School of Chemistry and Chemical Engineering,Heze University,Heze,274015,China
2.School of Chemistry and Chemical Engineering,Henan Polytechnic University,Jiaozuo,Henan,454003,China
3.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,030001,China
4.Academy for Advanced Interdisciplinary Studies and Department of Chemistry,Southern University of Science and Technology,Shenzhen,518055,China

Li，Fenghai,Zhao，Wei,Li，Junguo,et al. Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal[J]. ENERGY,2023,268.

Li，Fenghai.,Zhao，Wei.,Li，Junguo.,Fan，Hongli.,Xu，Meiling.,...&Fang，Yitian.(2023).Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal.ENERGY,268.

Li，Fenghai,et al."Investigation on influencing mechanisms of phosphogypsum (PG) on the ash fusion behaviors of coal".ENERGY 268(2023).