CaO对高钙烟煤熔融特性的影响
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摘要
通过在高钙烟煤的煤灰中添加不同含量的CaO,用于研究高钙烟煤的熔融特性变化情况和不同CaO含量下煤灰的熔融特性温度的变化情况。并且通过FactSage热力学软件对不同成分的合成灰进行模拟计算,用于对试验结果的佐证。研究结果表明,随着CaO添加量(质量分数)的增加,煤灰的熔融特性温度的整体趋势是先降低而后逐渐增加的。通过不同温度下灰中的矿物组成可以看出,添加一定量的CaO后,会使得高钙煤灰形成一种低温共熔体,从而使得灰熔点达到最低值。随着CaO添加量的继续增大,煤灰中钙硅石以及单晶氧化钙等高熔点矿物出现,煤灰熔点开始逐渐增加。并且从FactSage软件计算出的液相线温度结果和相图结果可以看出,其变化的趋势和熔融特性温度变化的趋势一致。
By adding different amounts of CaO in the coal ash of the high-calcium bituminous coal,the ash fusion characteristics of the high-calcium bituminous coal and the change of the melting temperature of the high-calcium coal ash under different CaO additions were studied.The FactSage thermodynamics software was used to simulate the mineral transformation law and the ternary phase diagram of the coal ash,which was used to verify the experimental results of different components.The results show that with the increasing of the CaO content,the melting characteristic temperature of the coal ash firstly decreases and then gradually increases.The CaO is often used as a flux,and a small amount of CaO addition causes a decrease in the melting point of the coal ash.However,when the CaO content in the coal reaches a certain value,a low-temperature eutectic is formed between the minerals in the coal ash,and the ash melting point reaches a minimum value.As the CaO content continues to increase,high-melting minerals such as the wollastonite and the single crystal calcium oxide appear in the coal ash,which leads to a gradual increase in the melting point of the coal ash.The change in the melting characteristic temperature is consistent with the calculated liquidus temperature results and phase diagram results obtained by the software,and the experimental result also shows the reliability of the FactSage software calculation results.
By adding different amounts of CaO in the coal ash of the high-calcium bituminous coal,the ash fusion characteristics of the high-calcium bituminous coal and the change of the melting temperature of the high-calcium coal ash under different CaO additions were studied.The FactSage thermodynamics software was used to simulate the mineral transformation law and the ternary phase diagram of the coal ash,which was used to verify the experimental results of different components.The results show that with the increasing of the CaO content,the melting characteristic temperature of the coal ash firstly decreases and then gradually increases.The CaO is often used as a flux,and a small amount of CaO addition causes a decrease in the melting point of the coal ash.However,when the CaO content in the coal reaches a certain value,a low-temperature eutectic is formed between the minerals in the coal ash,and the ash melting point reaches a minimum value.As the CaO content continues to increase,high-melting minerals such as the wollastonite and the single crystal calcium oxide appear in the coal ash,which leads to a gradual increase in the melting point of the coal ash.The change in the melting characteristic temperature is consistent with the calculated liquidus temperature results and phase diagram results obtained by the software,and the experimental result also shows the reliability of the FactSage software calculation results.
引文
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[17]马岩,黄镇宇,唐慧儒,等.准东煤灰化过程中的矿物演变及矿物添加剂对其灰熔融特性的影响[J].燃料化学学报,2014,42(1):20.(MA Yan,HUANG Zhen-yu,TANG Hui-ru,et al.Evolution of minerals in the process of coal ashing in Zhundong and the effect of mineral additives on its ash melting characteristics[J].Journal of Fuel Chemistry,2014,42(1):20.)
[18] LI F,LI M,FAN H,et al.Understanding ash fusion and viscosity variation from coal blending based on mineral interaction[J].Energy and Fuels,2017,32(1):132.
[19] YAN T,BAI J,KONG L,et al.Effect of SiO2/Al2O3on fusion behavior of coal ash at high temperature[J].Fuel,2017,193,275.
[2] XIAO H,LI F,LIU Q,et al.Modification of ash fusion behavior of coal with high ash fusion temperature by red mud addition[J].Fuel,2017,192:121.
[3] WANG G,ZHANG J,HUANG X,et al.Co-gasification of petroleum coke-biomass blended char with steam at temperatures of 1 173-1 373 K[J].Applied Thermal Engineering,2018,137:678.
[4] WANG G,ZHANG J,SHAO J,et al.Characterisation and model fitting kinetic analysis of coal/biomass co-combustion[J].Thermochimica Acta,2014,591:68.
[5]李燕江,吕庆,白瑞国,等.含钛炉渣稀释剂对喷吹煤粉燃烧性能的影响[J].钢铁,2016,51(4):8.(LI Yan-jiang,LQing,BAI Rui-guo,et al.Effect of titanium-containing slag diluent on combustion performance of pulverized coal injection[J].Iron and Steel,2016,51(4):8.)
[6]高鹏,赵丹宁,王平,等.马钢4 000m3高炉喷吹煤粉燃烧性能研究与应用[J].钢铁,2018,53(12):10.(GAO Peng,ZHAO Dan-ning,WANG Ping,et al.Research and application of combustion performance of pulverized coal injection in 4 000m3BF of Ma′anshan[J].Iron and Steel,2018,53(12):10.)
[7] WEI B,WANG X,TAN H,et al.Effect of silicon-aluminum additives on ash fusion and ash mineral conversion of Xinjiang high-sodium coal[J].Fuel,2016,181:1224.
[8] WANG X,XU Z,WEI B,et al.The ash deposition mechanism in boilers burning Zhundong coal with high contents of sodium and calcium:A study from ash evaporating to condensing[J].Applied Thermal Engineering,2015,80:150.
[9]周义义,朱永超,韩静,等.煤灰熔融特性的研究方法[J].山东工业技术,2018(16):74.(ZHOU Yi-yi,ZHU Yong-chao,HAN Jing,et al.Study on the melting characteristics of coal ash[J].Shandong Industrial Technology,2018(16):74.)
[10] JING N,WANG Q,YANG Y,et al.Influence of ash composition on the sintering behavior during pressurized combustion and gasification process[J].Journal of Zhejiang University science A,2012,13(3):230.
[11]王其,张建良,王广伟,等.配煤对煤灰熔融过程的矿物演变的影响[J].中国冶金,2018,28(5):7.(WANG Qi,ZHANG Jian-liang,WANG Guang-wei,et al.Effect of coal blending on mineral evolution of coal ash melting process[J].China Metallurgy,2018,28(5):7.)
[12]王东旭,陈裕辉,王洋,等.MgO含量对高钠煤灰熔融特性的影响[J].化工进展,2018,37(4):1392.(WANG Dong-xu,CHEN Yu-hui,WANG Yang,et al.Effect of MgO content on the melting characteristics of high sodium coal ash[J].Chemical Industry Progress,2018,37(4):1392.)
[13]李沙沙,王思学.CaO助熔剂对朱仙庄煤灰熔融特性的影响[J].宿州学院学报,2016,31(6):113.(LI Sha-sha,WANG Si-xue.Effect of CaO flux on the melting characteristics of Zhuxianzhuang coal ash[J].Journal of Suzhou University,2016,31(6):113.)
[14]李平,陈子珍,池国镇.FactSage软件应用于预测煤灰熔融流动温度[J].锅炉技术,2018,49(3):17.(LI Ping,CHEN Zizhen,CHI Guo-zhen.Factsage software used to predict coal ash melt flow temperature[J].Boiler Technology,2018,49(3):17.)
[15]任山,张建良,刘伟剑,等.高炉喷吹煤粉的灰熔融特性[J].钢铁研究学报,2012,24(10):11.(REN Shan,ZHANG Jian-liang,LIU Wei-jian,et al.Glass melting characteristics of pulverized coal injected into blast furnace[J].Journal of Iron and Steel Research,2012,24(10):11.)
[16]陈凡敏,王嘉瑞,赵冰,等.煤中矿物质对灰熔融和燃烧特性的影响[J].燃料化学学报,2015,43(1):27.(CHEN Fan-min,WANG Jia-rui,ZHAO Bing,et al.Effects of minerals in coal on ash melting and combustion characteristics[J].Journal of Fuel Chemistry and Technology,2015,43(1):27.)
[17]马岩,黄镇宇,唐慧儒,等.准东煤灰化过程中的矿物演变及矿物添加剂对其灰熔融特性的影响[J].燃料化学学报,2014,42(1):20.(MA Yan,HUANG Zhen-yu,TANG Hui-ru,et al.Evolution of minerals in the process of coal ashing in Zhundong and the effect of mineral additives on its ash melting characteristics[J].Journal of Fuel Chemistry,2014,42(1):20.)
[18] LI F,LI M,FAN H,et al.Understanding ash fusion and viscosity variation from coal blending based on mineral interaction[J].Energy and Fuels,2017,32(1):132.
[19] YAN T,BAI J,KONG L,et al.Effect of SiO2/Al2O3on fusion behavior of coal ash at high temperature[J].Fuel,2017,193,275.