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Vol 31 No. 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?)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10引言bucketfeederbelt I Crusher水煤漿CwS( coal water slurry)是煤粉碎成一convey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 feeding bu燃料和化工原料.在水煤漿的制備中,要求工業(yè)所制水煤漿的濃度大于60%黏度小于1200mPa·s.2影scrEen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指標重要的參數之一,研究粒度級配與水煤漿濃度Filter和黏度之間的關(guān)系對提高水煤漿性能具有重要意concentrationmeasure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.8measurE1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1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(%.)1.2實(shí)驗方法Yanzhou coal 2.5511.750.7233.94實(shí)驗采用濕法制漿工藝,制漿配煤為山東兗州Shenhua coal 7.50.3733.06礦煤:神華煤=2:1,分散劑分別采用分散劑I和Percent of weigh1)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廣東茂名收稱(chēng)日期:2007-12-12;修回日期:200801-08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Ee2.1粒度級配與水煤漿濃度的關(guān)系20.52121522225Proportion 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.E~B1578.579580.5815825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 wiof coal particles2062082121.221421621822222224a--Dpartuc<5 um:b--Dperticle <75 umIy j2sy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【所得到的水煤漿黏度更低.添加分次∽5散劑I時(shí),水煤漿顆粒直徑小于5pm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5μm所的比例約為21%和水煤漿顆粒直徑小于75μm所占5878579795808058l858285Proportion 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a-Dparticke <5 um:b--Dparirle<75 umrDispersant I :O-Dispersant I在分散劑I和分散劑I情況下,分別比較水煤由圖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4.比添加分散劑I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5m所占的比例約為黏度成正比在濃度大約低于64.9%時(shí),添加分散劑21%,水煤漿顆粒直徑小于75m所占的比例約為1所得的水媒漿黏度高于添加分散劑I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22粒度級配與水煤漿黏度的關(guān)系3結論在分散劑I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1)在混煤為山東煤:神華煤=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75m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2)在制漿混煤為山東兗州礦煤:神華煤=2:1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5μm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Concentration of CWS/%6的水煤漿黏度約為850mPa·s,未超過(guò)工業(yè)允許圖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L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L所小于5m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[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 AA et al. The Effect of Coal Properties on the Viscosity of Coal-water Slurries[ J]. Fuel, 200281(14):1856-1857,[3]張省現夏德宏吳樣字水煤漿粒度分布的分形學(xué)研究[]熱科學(xué)與技術(shù),20043(4):348349[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)1504-518.[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,200730(3):49-506]趙世永張眢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)889.[7]周明松,邱學(xué)青王衛星.水煤漿分散劑研究進(jìn)展[J]煤炭轉化,2004,27(3):15-16[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 elwerof 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 features of CWS is acquiredKEY WORDS coal water slurry, particle classification, concentration, viscosity