Characterization of coal water slurry prepared for PRB coal
-
摘要: Powder River Basin (PRB) coal, which accounts for over 40% of the coal consumed for power generation in the United States, was investigated for preparation of coal water slurry (CWS). The static stability and rheology of the CWS were characterized as a function of loading. The coal loading was varied from 30% to 50% and both ionic (sodium polystyrene sulphonate (PSS)) and nonionic (Triton X-100) surfactants were employed as additives. The addition of PSS to PRB slurries was found to yield poor static stability. On the other hand, Triton X-100 was found to be an effective surfactant, reducing the sedimentation by more than 50% compared to the one without surfactant in 45% CWS. Adding Triton X-100 reduces the viscosity of the CWS for coal loadings of 30% and 40%. Although the viscosities for coal loading of 42.5% and 45% are higher when Triton X-100 is added, the static stability is significantly better than for samples without surfactant. The highest coal loading for PRB slurry with acceptable viscosity for pumping is 42.5%.
-
关键词:
- coal water slurry /
- PRB coal /
- characterization
Abstract: Powder River Basin (PRB) coal, which accounts for over 40% of the coal consumed for power generation in the United States, was investigated for preparation of coal water slurry (CWS). The static stability and rheology of the CWS were characterized as a function of loading. The coal loading was varied from 30% to 50% and both ionic (sodium polystyrene sulphonate (PSS)) and nonionic (Triton X-100) surfactants were employed as additives. The addition of PSS to PRB slurries was found to yield poor static stability. On the other hand, Triton X-100 was found to be an effective surfactant, reducing the sedimentation by more than 50% compared to the one without surfactant in 45% CWS. Adding Triton X-100 reduces the viscosity of the CWS for coal loadings of 30% and 40%. Although the viscosities for coal loading of 42.5% and 45% are higher when Triton X-100 is added, the static stability is significantly better than for samples without surfactant. The highest coal loading for PRB slurry with acceptable viscosity for pumping is 42.5%.-
Key words:
- coal water slurry /
- PRB coal /
- characterization
-
MANFRED R K. Coal-water slurry as a utility boiler fuel[J]. Annual Rev Energy, 1986, 11: 25-45. BELL D A, TOWLER B F, FAN M. Coal gasification and its applications[M]. William Andrew/Elsevier, 2011. HONG J, FIELD R, GAZZINO M, GHONIEM A F. Operating pressure dependence of the pressurized oxy-fuel combustion power cycle[J]. Energy, 2010, 35: 5319-5399. GOPAN A, KUMFER B M, PHILLIPS J, THIMSEN D, SMITH R, AXELBAUM R L. Process design and performance analysis of a staged, pressurized oxy-combustion (SPOC) power plant for carbon capture[J]. Appl Energy, 2014, 125: 179-188. JOHN T. Boyd company, powder river basin coal resource and cost study[R]. 2011. LEE S. Encyclopedia of chemical processing[M]. Taylor & Francis, 2006. LEE S, SPEIGHT J G, LOYALKA S K. Handbook of alternative fuel technologies[M]. CRC Press, 2007. DENG S M, HYNES R. Thermodynamic analysis and comparison on oxy-fuel power generation process[J]. J Eng Gas Turb, 2009, 131(5). YI F, AXELBAUM R L. Stability of spray combustion for water/alcohols mixtures in oxygen-enriched air[J]. Proc Combust Inst, 2013, 34: 1697-1704. YI F, AXELBAUM R L. Utilizing preferential vaporization to enhance the stability of spray combustion for high water content fuels[J]. Combust Flame, 2014, 161: 2008-2014. LASKOWSKI J. Coal flotation and fine coal utilization[M]. Elsevier, 2001. WEI Y C, LI B Q, LI W, CHEN H K. Effects of coal characteristics on the properties of coal water slurry[J]. Coal Pre, 2005, 25(4): 239-249. TADROS T F, TAYLOR P, BOGNOLO G. Influence of addition of a polyelectrolyte nonionic polymers, and their mixtures on the rheology of coal/water suspensions[J]. Langmuir, 1995, 11(12): 4678-4684. SKEEN S A, KUMFER B M, AXELBAUM R L. Nitric oxide emissions during coal and coal/biomass combustion under air-fired and oxy-fuel conditions[J]. Energy Fuels, 2010, 24: 4144-4152. DING K, LASKOWSKI J S. Effect of flotation on preparation of coal-water slurries[J]. Int J Coal Pre Util, 2009, 29(2): 84-98. SESHADRI A K, CATON J A, KIHM K D. Coal-water slurry spray characteristics of a positive displacement fuel-injection system[J]. J Eng Gas Turb Power, 1992, 114(3): 528-533. ZHANG R Z. The technology of coal water slurry preparation[M]. Science Press, 1996. ASMATULU R, LUTTRELL G H, YOON R H. Dewatering of fine coal using hyperbaric centrifugation[J]. Coal Pre, 2005, 25(3): 117-127. -
点击查看大图
计量
- 文章访问数: 761
- HTML全文浏览量: 19
- PDF下载量: 1557
- 被引次数: 0
下载:
