煤灰的熔融和结渣特性就是影响燃煤锅炉正常运行的主要原因,煤灰燃烧过程中的相变的研究对分析锅炉低温共熔和结焦有重要意义.本文分别对灰样和加入助熔剂的灰样进行热重分析,结合TG、DTG、DSC曲线在DDSC曲线上判别发生相变的温度段,然后利用X-射线衍射法对其机理进行分析并验证热重实验的结论.XRD法分析结果验证了TG-DSC法的DDSC曲线能够判别煤灰中的相变温度段,证明运用TG-DSC分析煤灰发生相变的温度段是有一定可行性的,而且把TG-DSC和XRD两种方法结合起来研究煤灰相变机理的技术是有效的.
Melting and slagging characteristics of coal ash are the main factors that harm the function of boilers.It is significant to recognize the phase-transition temperature in coal combustion for low temperature congruent melting and slagging.In this paper,ash and ash-added flux are analyzed with thermogravimetry method,and the phase-transition temperature range is judged in the DDSC curve combining the TG.DTG and DSC curves.It is feasible that DDSC curves of TG-DSC method is used to 1udge the temperature range where the phase-transition happens in the ash on the basis of XRD.The mechanism is found bv X-ray diffraction analysis,which verifies the result of DDSC.It is proved that analyzing the phase-transition temperature range of coal ash by TG-DSC is feasible,and it is valid to study the phase-transition mechanism of coal ash by using TG-DSC and XRD methods.
参考文献
| [1] | M C Mayoral;M T Izquierdo;J M Andres et al.Aluminousilicates Transformations in Combustion Followed by DSC[J].Thermochimica Acta,2001,374(01):173-180. |
| [2] | t. F. Wall;R. A. Creelman;R. P. Gupta .Coal ash fusion temperatures-New characterization techniques, and implications for slagging and fouling[J].Progress in energy and combustion science,1998(4):345-353. |
| [3] | Kahraman H.;Reifenstein A.;Coin CDA.;Bos F. .Application of a new ash fusion test to Theodore coals[J].Fuel,1998(9/10):1005-1011. |
| [4] | Ch. Goni;S. Helle;X. Garcia;A. Gordon;R. Parra;U. Kelm;R. Jimenez;G. Alfaro .Coal blend combustion: fusibility ranking from mineral matter composition[J].Fuel,2003(15/17):2087-2095. |
| [5] | Mayoral MC.;Izquierdo MT.;Andres JM.;Rubio B. .Mechanism of interaction of pyrite with hematite as simulation of slagging and fireside tube wastage in coal combustion[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2002(1/2):103-111. |
| [6] | 刘志,杨建国,赵虹.配煤煤灰熔融特性的热分析研究[J].电站系统工程,2006(03):4-6. |
| [7] | Lone A Hansen;Flemming J Franden;Kim DamJohansen et al.Quantification of Fusion in Ashes from Solid Fuel Combustion[J].Thermochimica Acta,1999,326(1-2):105-107. |
| [8] | 高峰,赵增立,崔洪,张济宇,张碧江.煤系高岭土的DTA特征[J].燃料化学学报,1998(01):24-29. |
| [9] | 王泉清;曾蒲君.高岭石对神木煤灰熔融性的影响[J].煤化工,1997(03):40-45. |
| [10] | Srinivasachar S;BONI A A .A Kinetic Model for Pyrite Transformations in a Combustion Environment[J].FUEL,1989,68(07):829-836. |
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