粒度級配對混煤水煤漿濃度與黏度的影響

第31卷第2期煤炭轉化l.31No.22008年4月COAL CONVERSIONApr.2008粒度級配對混煤水煤漿濃度與黏度的影響葉向榮1)劉定平2)陳其中3)蔡泓銘1摘要水煤漿濃度與黏度是衡量水煤漿性能的兩個(gè)重要指標.粒度級配是影響水煤漿性能的關(guān)鍵因素,合適的粒度級配可提高水煤漿性能.以某水煤漿廠(chǎng)所用的精煤和分散劑為實(shí)驗基礎研究了在該水煤漿廠(chǎng)常用的混配煤和兩種常用的分散劑條件下,粒度級配和水煤漿濃度、黏度的關(guān)系,獲得了使用不同分散劑時(shí)水煤漿性能最佳時(shí)所對應的粒度級配關(guān)鍵詞水煤漿,粒度級配,濃度,黏度中圖分類(lèi)號TQ517.4分散劑I.工藝流程見(jiàn)圖1.0引言Caal k vibratingbucketfeederhlt鬥crus水煤漿CwS( coal water slurry)是煤粉碎成一定粒徑分布的顆粒后,與水、添加劑按比例混合制成高濃度的煤、水分散體系.水煤漿可作為代替石油的液體distributor feedingbunker燃料和化工原料.在水煤漿的制備中,要求工業(yè)所制水Vibration煤漿的濃度大于60%黏度小于1200mPa·s.2影sereen響水煤漿濃度與黏度的主要因素有煤的品種、粒度級配和分散劑等.其中粒度級配是控制水煤漿性能Cushioningbucket指標重要的參數之一,研究粒度級配與水煤漿濃度和黏度之間的關(guān)系對提高水煤漿性能具有重要意義.35本文以某水煤漿廠(chǎng)所用的精煤和分散劑為基礎開(kāi)展實(shí)驗,研究了粒度級配和水煤漿濃度、黏度的viscosity關(guān)系,得出了使用不同分散劑時(shí)水煤漿性能最佳時(shí)所對應的粒度級配.811實(shí)驗部分圖1濕法制漿工藝流程Fig 1 Processes flow wet method manufacture slurry1.1試劑與儀器1.3煤質(zhì)分析實(shí)驗試劑有:山東兗州礦煤、神華煤、分散劑I山東兗州礦煤和神華煤的工業(yè)分析結果見(jiàn)表1和分散劑I;實(shí)驗儀器有:哈克 HAKKE550旋轉黏表1山東兗州礦煤和神華煤的工業(yè)分析結果(%")度計、鹵素快速水分儀HB43和馬爾文2000激光粒Table 1 Proximate analysis of Yanzhou coal度儀and Shenhua coal(%·)A1.2實(shí)驗方法Yanzhou co2.5511.750.7233.94實(shí)驗采用濕法制漿工藝,制漿配煤為山東兗州中國煤化工0.3733.06礦煤:神華煤=2:1.分散劑分別采用分散劑I和dHCNMHG1)碩士生;2)副教授華南理工大學(xué)電力學(xué)院,510640廣州;3)工程師,茂名熱電廠(chǎng),525011廣東茂名收稿H期:2007-12-12;修回日期:2008-0108第2期向榮等粒度級配對混煤水煤漿濃度與黏度的影響由表1可知,山東兗州礦煤為低水分、高灰分高硫分煤,神華煤為低水分、低灰分、低硫分煤,兩者經(jīng)過(guò)精洗后混配適合水煤漿制造要求2結果與討論2.1粒度級配與水煤漿濃度的關(guān)系83220521215225Proportion of particle /在分散劑和分散劑I情況下,測定水煤漿顆粒直徑小于5m所占的比例、水煤漿顆粒直徑小于75μm所占的比例對應的混煤水煤漿濃度,結果見(jiàn)圖2.65.0578.5795805815825圖3水煤漿黏度隨著(zhù)煤顆粒占總顆粒百分比的變化Fig 3 Variations of viscosity with the percent6324206208212122142162182224of coal particlesProportion of particle/%Dpartc,<5 um:b--Dpartil <75 umDispersant I iO-Dispersant I654y easy由圖3可知,在相同粒度分布下,添加分散劑I比添加分散劑I所得到的水煤漿黏度更低.添加分散劑I時(shí),水煤漿顆粒直徑小于5μm所占的比例約為21%水煤漿顆粒直徑小于75μm所占的比例約為79%所對應的水煤漿黏度約為850mPa·s綜上所述,在配煤為山東兗州礦煤:神華煤=2:1,添加分散劑I時(shí),水煤漿顆粒直徑小于5m所占的比例約為21%和水煤漿顆粒直徑小于75μm所占775787857979580805885828Proportion of particle/%的比例約為79%對應的水煤漿濃度最高,且其黏度圖2水煤漿濃度隨著(zhù)煤顆粒占總顆粒百分比的變化未超過(guò)工業(yè)允許的上限值Fig 2 Variations of concentration with thepercent of coal particles2.3水煤漿濃度與黏度的關(guān)系Partick<5 um:b--Dparticl,<75 Hmr在分散劑I和分散劑I情況下,分別比較水煤Dispersant 1 :O-Dispersant由圖2可知,在相同粒度級配下,添加分散劑1漿濃度與黏度的關(guān)系,結果見(jiàn)第30頁(yè)圖比添加分散劑所得到的水煤漿濃度更高.添加分散由圖4可知,在相同制漿條件下,水煤漿濃度與劑I時(shí),水煤漿顆粒直徑小于5pm所占的比例約為黏度成正比在濃度大約低于6.9%時(shí),添加分散劑21%,水煤漿顆粒直徑小于75pm所占的比例約為所得的水煤漿黏度高于添加分散劑1所得的水煤79%所對應的水煤漿濃度最高,約達到65.2%漿黏度;濃度大約高于64.9%時(shí),添加分散劑I所得的水煤漿黏度低于添加分散劑I所得的水煤漿黏度2.2粒度級配與水煤漿黏度的關(guān)系在分散劑I和分散劑I情況下,測定水煤漿顆3ArV凵中國煤化工CNMHG粒直徑小于5pm所占的比例、水煤漿顆粒直徑小于水·們平=2:1的濕法制75m所占的比例對應的混煤水煤漿黏度,結果見(jiàn)圖3.漿工藝時(shí),添加分散劑I比添加分散劑I可獲得更炭轉化小于75pm所占的比例約為79%時(shí),對應的水煤漿濃度最高,約65,2%,達到工業(yè)應用標準在制漿混煤為山東兗州礦煤:神華煤=2的濕法制漿工藝時(shí),添加分散劑I比添加分散劑I可獲得更低的水煤漿黏度.添加分散劑I時(shí),水煤漿顆粒直徑小于5m所占的比例約為21%和水煤漿顆粒直徑小于75μm所占的比例約為79%時(shí),對應的水煤漿黏度約為850mPa·s,未超過(guò)工業(yè)允許的圖4水煤漿濃度與黏度關(guān)系上限值1200mPa·sFig 4 Variations of viscosity with concentration3)在相同制漿條件下,水煤漿濃度與黏度成正*-Dispersant I :O---Dispersant I比濃度約低于64.9%時(shí),添加分散劑I所得的水煤高的水煤漿濃度添加分散劑1時(shí),水煤漿顆粒直徑漿黏度較低;濃度約高于64.9%時(shí)添加分散劑I所小于5pm所占的比例約為21%和水煤漿顆粒直徑得的水煤漿黏度較低考文獻[1]李珊珊程軍,李艷昌等水煤漿黏度的幾種影響因素分析[].煤炭轉化,2006,29(1):23-25[2] Atesok G, Boylu F, Sirkeci A A et al. The Effect of Coal Properties on the Viscosity of Coal-water Slurries[J]. Fuel,20028l(14):1856-1857[3]張省現夏德宏吳樣宇水煤漿粒度分布的分形學(xué)研究[J]熱科學(xué)與技術(shù),20043(4):348-349[4] Son S Y, Kihm K D. Effect of Coal Particle Size on Coal-water Slurry(CWS) Atomization, Atomization and Sprays [J].Journal of the International Institutions for Liquid Atomization and Spray Systems, 1998, 8(5): 504-518.[5]朱瑞黃定國,吳玉敏等新型黑液水煤漿的燃燒特性及動(dòng)力學(xué)分析[]煤炭轉化,2007,30(3):49-50[6]趙世永張晉陶粒度配比對神府煤水煤漿穩定性的影響[門(mén)煤炭工程,2006(12):88-89[7]周明松,邱學(xué)青,王衛星,水煤漿分散劑研究進(jìn)展[]煤炭轉化,2004,27(3):1516[8] Mishra S K, Senapai P K, Panda D. Rheological Behavior of Coal-water Slurry [] Energy Sources, 2002. 24:162-166.EFFECT OF GRADING SIZE ON THE CONCENTRATION ANDVISCOSITY OF COAL WATER SLURRYFOR BLENDED COALSYe Xiangrong Liu Dingping Chen Qizhong and Cai Hongming(School of Electric Power of South China University of Technology, 510640 Guangzhou:Maoming Thermal Plant, 525011 Maoming, Guangdong)aBSTRaCt Concentration and viscosity are two main factors of the features of Cws(coalwater slurry ) Particle classification is one of the key factors that have effect on the features ofCWS. The features of CwS could be improved by appropriate particle classification. By theexperiment used clean coal and dispersant, the relations between particle classification andconcentration and viscosity of CwS are studied based on the specifical coal-blending ratio anddispersant. The particle classification with the prime fe中國煤化工KEY WORDS coal water slurry, particle classificaCNMHG