洁净煤技术
潔淨煤技術
길정매기술
CLEAN COAL TECHNOLOGY
2015年
2期
45-50,55
,共7页
准东煤%灰化%灰成分分析%钠迁移
準東煤%灰化%灰成分分析%鈉遷移
준동매%회화%회성분분석%납천이
Zhundong coal%ash%ash composition analysis%sodium migration
为研究准东煤成灰过程中钠的迁移特性及形态变化,通过热重试验分析了5种准东煤的着火温度和燃烬温度,在575和815℃成灰温度下对5种准东煤进行灰化试验;重点研究了成灰温度对准东煤成灰特性的影响,采用X射线荧光光谱仪( XRF)、X射线衍射仪( XRD)、扫描电镜-能谱分析仪( SEM-EDS)等方法对成灰理化特性进行了表征,最后采用化学热力学软件FactSage模拟了准东木垒煤灰化过程中钠的迁移特性。结果表明,5种准东煤的着火温度均低于400℃,燃烬温度均低于500℃。575和815℃成灰物质形态与理化特性差异明显,815℃时5种准东煤成灰中钠含量相比575℃分别降低了47.67%、88.89%、62.45%、52.48%和85.78%,成灰表面钠含量分别降低了67.52%、75.70%、44.87%、63.71%和90.08%。成灰温度不仅影响煤灰中钠含量,还影响钠的赋存形态,800℃以上高温灰中出现黏结现象。最终确定5种准东煤的成灰温度为575℃,既能保证煤样成灰完全,又能最大限度减少灰化过程中碱金属钠元素的损失。
為研究準東煤成灰過程中鈉的遷移特性及形態變化,通過熱重試驗分析瞭5種準東煤的著火溫度和燃燼溫度,在575和815℃成灰溫度下對5種準東煤進行灰化試驗;重點研究瞭成灰溫度對準東煤成灰特性的影響,採用X射線熒光光譜儀( XRF)、X射線衍射儀( XRD)、掃描電鏡-能譜分析儀( SEM-EDS)等方法對成灰理化特性進行瞭錶徵,最後採用化學熱力學軟件FactSage模擬瞭準東木壘煤灰化過程中鈉的遷移特性。結果錶明,5種準東煤的著火溫度均低于400℃,燃燼溫度均低于500℃。575和815℃成灰物質形態與理化特性差異明顯,815℃時5種準東煤成灰中鈉含量相比575℃分彆降低瞭47.67%、88.89%、62.45%、52.48%和85.78%,成灰錶麵鈉含量分彆降低瞭67.52%、75.70%、44.87%、63.71%和90.08%。成灰溫度不僅影響煤灰中鈉含量,還影響鈉的賦存形態,800℃以上高溫灰中齣現黏結現象。最終確定5種準東煤的成灰溫度為575℃,既能保證煤樣成灰完全,又能最大限度減少灰化過程中堿金屬鈉元素的損失。
위연구준동매성회과정중납적천이특성급형태변화,통과열중시험분석료5충준동매적착화온도화연신온도,재575화815℃성회온도하대5충준동매진행회화시험;중점연구료성회온도대준동매성회특성적영향,채용X사선형광광보의( XRF)、X사선연사의( XRD)、소묘전경-능보분석의( SEM-EDS)등방법대성회이화특성진행료표정,최후채용화학열역학연건FactSage모의료준동목루매회화과정중납적천이특성。결과표명,5충준동매적착화온도균저우400℃,연신온도균저우500℃。575화815℃성회물질형태여이화특성차이명현,815℃시5충준동매성회중납함량상비575℃분별강저료47.67%、88.89%、62.45%、52.48%화85.78%,성회표면납함량분별강저료67.52%、75.70%、44.87%、63.71%화90.08%。성회온도불부영향매회중납함량,환영향납적부존형태,800℃이상고온회중출현점결현상。최종학정5충준동매적성회온도위575℃,기능보증매양성회완전,우능최대한도감소회화과정중감금속납원소적손실。
In order to study the Migration characteristics and morphological changes of sodium during ashing process of Zhundong coal, Zhundong coal samples from five coal mines were ashed at 575 ℃ and 815 ℃,meanwhile,the ignition temperature and burnout tempera-ture of the samples were analyzed through thermogravimetric experiment. The influence of ashing temperature on ash characteristics of Zhundong coal was investigated. The ash was characterized with X-ray fluorescence( XRF),X-ray diffraction( XRD)and scanning elec-tron microscope and energy dispersive spectrometry( SEM-EDS). FactSage was used to explain and forecast sodium migration characteris-tics during ashing process. The results showed that,the ignition temperature of five Zhundong coals was below 400℃,the burnout tempera-ture was below 500 ℃. The form and physicochemical properties of ash which were obtained at 575 ℃and 815 ℃ respectively had large differences. Compared with the sodium in ash gotten at 575 ℃,the sodium content decreased by 47. 67%,88. 89%,62. 45%,52. 48%, 85. 78% at 815 ℃. The sodium on the surface of ash decreased by 67. 52%,75. 70%,44. 87%,63. 71% and 90. 08%. The ashing tem-perature influenced not only the sodium content,but the form of sodium. When the ashing temperature was higher than 800 ℃,the ash showed adhesive phenomenon. At last,575℃ was determined finally as ashing temperature which ensured complete combustion of Zhundo-ng coal and reduced volatilization of sodium content.