燃料化学学报
燃料化學學報
연료화학학보
Journal of Fuel Chemistry and Technology
2015年
9期
1038-1043
,共6页
李阳%刘洋%冯伟%赵斌%智科端%滕英跃%宋银敏%何润霞%周晨亮%刘全生
李暘%劉洋%馮偉%趙斌%智科耑%滕英躍%宋銀敏%何潤霞%週晨亮%劉全生
리양%류양%풍위%조빈%지과단%등영약%송은민%하윤하%주신량%류전생
胜利褐煤焦%氧化钙%水蒸气气化%微结构%拉曼光谱
勝利褐煤焦%氧化鈣%水蒸氣氣化%微結構%拉曼光譜
성리갈매초%양화개%수증기기화%미결구%랍만광보
Shengli lignite char%calcium oxide%steam gasification%microstructure%Raman spectra
研究了CaO对胜利褐煤焦水蒸气气化反应性能及微结构的影响。脱除矿物质的胜利褐煤混合不同含量的CaO后在1100℃下进行热解得到相应的煤焦,采用BET、XRD和Raman技术对其进行表征,同时在微型固定床反应器上对所制得煤焦进行水蒸气气化实验。比较添加CaO不同含量煤焦的反应性表明,添加2％(质量分数)的CaO对煤焦水蒸气气化的催化作用很小,而CaO添加量增大到5％时,煤焦的气化反应性能明显提高。煤焦比表面积随CaO添加量的提高而增大。 XRD结果表明,在热解过程中,CaO能有效地抑制煤焦向石墨化方向发展趋势。煤焦002和100峰的峰强度随CaO添加量的增加而降低,且煤焦芳香度从66.8％降至39.9％。 Raman光谱结果表明,随着CaO添加量的增加,ID/IG 由1.363增加至1.541, IG/Ial由0.423减少到0.394。意味着由于Ca的催化作用,煤中大芳香环结构的裂解速率明显增加,且随CaO添加量的增多,煤焦的无序化程度和晶格缺陷均增大。
研究瞭CaO對勝利褐煤焦水蒸氣氣化反應性能及微結構的影響。脫除礦物質的勝利褐煤混閤不同含量的CaO後在1100℃下進行熱解得到相應的煤焦,採用BET、XRD和Raman技術對其進行錶徵,同時在微型固定床反應器上對所製得煤焦進行水蒸氣氣化實驗。比較添加CaO不同含量煤焦的反應性錶明,添加2％(質量分數)的CaO對煤焦水蒸氣氣化的催化作用很小,而CaO添加量增大到5％時,煤焦的氣化反應性能明顯提高。煤焦比錶麵積隨CaO添加量的提高而增大。 XRD結果錶明,在熱解過程中,CaO能有效地抑製煤焦嚮石墨化方嚮髮展趨勢。煤焦002和100峰的峰彊度隨CaO添加量的增加而降低,且煤焦芳香度從66.8％降至39.9％。 Raman光譜結果錶明,隨著CaO添加量的增加,ID/IG 由1.363增加至1.541, IG/Ial由0.423減少到0.394。意味著由于Ca的催化作用,煤中大芳香環結構的裂解速率明顯增加,且隨CaO添加量的增多,煤焦的無序化程度和晶格缺陷均增大。
연구료CaO대성리갈매초수증기기화반응성능급미결구적영향。탈제광물질적성리갈매혼합불동함량적CaO후재1100℃하진행열해득도상응적매초,채용BET、XRD화Raman기술대기진행표정,동시재미형고정상반응기상대소제득매초진행수증기기화실험。비교첨가CaO불동함량매초적반응성표명,첨가2％(질량분수)적CaO대매초수증기기화적최화작용흔소,이CaO첨가량증대도5％시,매초적기화반응성능명현제고。매초비표면적수CaO첨가량적제고이증대。 XRD결과표명,재열해과정중,CaO능유효지억제매초향석묵화방향발전추세。매초002화100봉적봉강도수CaO첨가량적증가이강저,차매초방향도종66.8％강지39.9％。 Raman광보결과표명,수착CaO첨가량적증가,ID/IG 유1.363증가지1.541, IG/Ial유0.423감소도0.394。의미착유우Ca적최화작용,매중대방향배결구적렬해속솔명현증가,차수CaO첨가량적증다,매초적무서화정도화정격결함균증대。
The Influence of calcium oxide on Shengli lignite char microstructure and steam gasification performance was studied. Demineralized coal samples were loaded with different content of calcium oxide and then pyrolyzed at 1 100℃. The char is gasified with steam in a micro fixed-bed reactor. The X-ray diffraction apparatus and Raman spectra apparatus were used to characterize the structure of coal char. The results show that the char with 5% calcium exhibits the highest gasification reactivity, while the catalysis for the steam gasification of char with 2% calcium is almost negligible. The results of XRD suggest that calcium can effectively hinder the carbon graphitization in the process of pyrolysis. The intensity of (002) and (100) peaks of char decreases with the rise of calcium loading. With the increase of calcium loading, the aromaticity fa is reduced from 66. 8% to 39. 9%. Raman spectra results show that ID/IG increases from 1. 363 to 1. 541 and IG/Ial reduces from 0. 423 to 0. 394 with the increase of calcium loading, respectively. It means that the decomposition of large polyaromatic ring structure in coal is greatly enhanced by the catalytic action of calcium, and the disordering degree and the structural defects of char increase with the increase of calcium loading.
