O_2/H_2O气氛下煤粉燃烧SO_2生成特性
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摘要
为了研究煤粉在O_2/H_2O气氛下SO_2的生成特性,选取3种特定含硫量和Ca/S摩尔比的煤粉,在沉降炉燃烧系统上对其在O_2/N_2、O_2/CO_2和O_2/H_2O 3种不同气氛下SO_2生成与煤灰自固硫特性进行研究。结果表明:神华煤SO_2排放质量浓度分别为120、125和129 mg/m~3、自固硫效率为26%、26.01%和25.29%,霍林河煤为153、145和160 mg/m~3以及35.65%、36.18%和35.43%,平顶山煤为1 007、1 071和1 064 mg/m~3以及18.54%、19.69%和19.6%,煤燃烧产生的SO_2以及煤灰的自固硫特性与燃烧气氛基本无关,与煤中硫的质量分数有关;含硫量越高的煤,SO_2排放越多;煤灰的自固硫作用并不随Ca/S摩尔比的增加而增加。
To investigate the SO_2 formation characteristics in O_2/H_2O,the SO_2 emission characteristics and sulfur self-retention by ash of three coals with different sulfur contents and Ca/S molar ratios under O_2/N_2,O_2/CO_2 and O_2/H_2O combustion were investigated in a drop tube furnace(DTF),aiming to ascertain the effects of combustion atmosphere,sulfur content and Ca/S molar ratio.For SH coal,SO_2 emission rates were 120-129 mg/m~3 and sulfur self-retention efficiencies were 25.29-26.01% under three combustion atmospheres.For HLH coal,SO_2 emission rates were 145-160 mg/m~3 and sulfur self-retention efficiencies were 35.43-36.18%.For PDS coal,SO_2 emission rates were 1 007-1 071 mg/m~3 and sulfur self-retention efficiencies were 18.54-19.69%.SO_2 emission and sulfur self-retention efficiency by ash were mainly affected by sulfur contents of coal instead of combustion atmosphere.Coals with higher sulfur contents discharge more SO_2,while the sulfur self-retention efficiency by ash is not always improved with the increase of Ca/S molar ratio.
To investigate the SO_2 formation characteristics in O_2/H_2O,the SO_2 emission characteristics and sulfur self-retention by ash of three coals with different sulfur contents and Ca/S molar ratios under O_2/N_2,O_2/CO_2 and O_2/H_2O combustion were investigated in a drop tube furnace(DTF),aiming to ascertain the effects of combustion atmosphere,sulfur content and Ca/S molar ratio.For SH coal,SO_2 emission rates were 120-129 mg/m~3 and sulfur self-retention efficiencies were 25.29-26.01% under three combustion atmospheres.For HLH coal,SO_2 emission rates were 145-160 mg/m~3 and sulfur self-retention efficiencies were 35.43-36.18%.For PDS coal,SO_2 emission rates were 1 007-1 071 mg/m~3 and sulfur self-retention efficiencies were 18.54-19.69%.SO_2 emission and sulfur self-retention efficiency by ash were mainly affected by sulfur contents of coal instead of combustion atmosphere.Coals with higher sulfur contents discharge more SO_2,while the sulfur self-retention efficiency by ash is not always improved with the increase of Ca/S molar ratio.
引文
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[22] SHENG C,XU M,ZHANG J,et al.Comparison of sulphur retention by coal ash in different types of combustors[J].Fuel Processing Technology,2000,64(1):1-11.
[23] 谭娅.燃煤固硫添加剂的实验研究及其促进固硫机理分析[D].长沙:湖南大学,2005.TAN Ya.Experiment research of additives on sulfur capture during coal combustion and analysis of mechanism on promoting effect[D].Changsha:Hunan University,2005.
[2] 隋建才,杜云贵,徐明厚,等.我国煤燃烧研究发展现状与趋势[J].热能动力工程,2008 ,23 (2) :111-116.SUI Jian-cai,DU Yun-gui,XU Ming-hou,et al.Current situation and trend of research and development of coal combustion in China[J].Journal of Engineering for Thermal Energy and Power,2008,23(2):111-116.
[3] TOFTEGAARD M B,BRIX J,JENSEN P A,et al.Oxy-fuel combustion of solid fuels[J].Progress in Energy and Combustion Science,2010,36(5):581-625.
[4] BUHRE B J P,ELLIOTT L K,SHENG C D,et al.Oxy-fuel combustion technology for coal-fired power generation[J].Progress in Energy and Combustion Science,2005,31(4):283-307.
[5] SALVADOR C.Modeling design and pilot-scale experiments of CANMET′S advanced oxy-fuel/steam burner[C]//USA:International Oxy-Combustion Network for CO2 Capture-Report on 2nd Workshop,2007.
[6] SEEPANA S,JAYANTI S.Steam-moderated oxy-fuel combustion[J].Energy Conversion and Management,2010,51(10):1981-1988.
[7] 顾念祖.燃煤电厂脱硫的现状分析和防治对策[J].热能动力工程,2000,15(2):91-92.GU Nian-zu.Analysis and prevention countermeasures of desulfurization in coal-fired power plants[J].Journal of Engineering for Thermal Energy and Power,2000,15(2):91-92.
[8] CHENG J,ZHOU J,LIU J,et al.Sulfur removal at high temperature during coal combustion in furnaces:a review[J].Progress in Energy and Combustion Science,2003,29(5):381-405.
[9] LI S,XU T,SUN P,et al.NOx and SOx emissions of a high sulfur self-retention coal during air-staged combustion[J].Fuel,2008,87(6):723-731.
[10] 周英彪,郑瑛,张礼知,等.空气与O2 +CO2 气氛下钙基脱硫剂固硫规律的实验研究[J].热能动力工程,2001,16(4):409-411.ZHOU Ying-biao,ZHENG Ying,ZHANG Li-zhi,et al.Experimental study on sulfur fixation of calcium based desulfurizer under air and O2 + CO2 atmosphere[J].Journal of Engineering for Thermal Energy and Power,2001,16(4):409-411.
[11] 李英杰,赵长遂,段伦博.O2/CO2 气氛下煤燃烧产物的热力学分析[J].热能动力工程,2007,22(3):332-335.LI Ying-jie,ZHAO Chang-sui,DUAN Lun-bo.Thermodynamic analysis of coal combustion products in O2/CO2 atmosphere[J].Journal of Engineering for Thermal Energy and Power,2007,22(3):332-335.
[12] 孙绍增,陈昊,孟宪宇,等.富氧燃烧条件下煤焦特性研究[J].热能动力工程,2012,27(2):192-196.SUN Shao-zeng,CHEN Hao,MENG Xian-yu,et al.Study on coal char properties under oxygen-enriched combustion[J].Journal of Engineering for Thermal Energy and Power,2012,27(2):192-196.
[13] 丁继伟,张立麒,夏佐君,等.富氧气氛下水蒸气气化对煤焦燃烧的影响[J].热能动力工程,2017,32(1):63-69.DING Ji-wei,ZHANG Li-lin,XIA Zuo-jun,et al.Effect of steam vaporization on coal char burning in oxygen-enriched atmosphere[J].Journal of Engineering for Thermal Energy and Power,2017,32(1):63-69.
[14] SHENG L,LIU X,SI J,et al.Simulation and comparative exergy analyses of oxy-steam combustion and O2/CO2 recycled combustion pulverized-coal-fired power plants[J].International Journal of Greenhouse Gas Control,2014,27:267-278.
[15] WANG X,LIU X,LI D,et al.Effect of steam and sulfur dioxide on sulfur trioxide formation during oxy-fuel combustion[J].International Journal of Greenhouse Gas Control,2015,43:1-9.
[16] SRIVASTAVA R K,MILLER C A,ERICKSON C,et al.Emissions of sulfur trioxide from coal-fired power plants[J].Journal of the Air & Waste Management Association,2004,54(6):750-762.
[17] Brady J E,Holum J R.Fundamentals of chemistry[M].The United Kingdom:John Wiley & Sons,1988.
[18] 田路泞,陈振辉,王贤华,等.水蒸气和石灰石对流化床富氧燃烧NO的影响[J].华中科技大学学报(自然科学版),2014(8):95-99.TIAN Lu-ning,CHEN Zhen-hui,WANG Xian-hua,et al.Effect of steam and limestone on NO during oxy-fuel Fluidized bed combustion[J].J.Huazhong Univ.of Sci.& Tech.(Natural Science Edition),2014(8):95-99.
[19] CROISET E,THAMBIMUTHU K,PALMER A.Coal combustion in O2/CO2 mixtures compared with air[J].The Canadian Journal of Chemical Engineering,2000,78(2):402-407.
[20] 陈传敏,赵长遂,赵毅,等.O2/CO2气氛下燃煤过程中SO2排放特性实验[J].东南大学学报(自然科学版),2006(4):546-550.CHEN Chuan-min,ZHAO Chang-sui,ZHAO Yi,et al.Experiments of SO2 emission characteristics during coal combustion under O2 /CO2 atmosphere[J].Journal of Southeast University (Natural Science Edition),2006(4):546-550.
[21] 熊友辉,孙学信.煤中钙质矿物的自固硫作用[J].电站系统工程,1998(2):40-42,45.XIONG You-hui,SUN Xue-xin.Self-sulfuration of calcareous minerals in coal[J].Power System Engineering,1998(2):40-42,45.
[22] SHENG C,XU M,ZHANG J,et al.Comparison of sulphur retention by coal ash in different types of combustors[J].Fuel Processing Technology,2000,64(1):1-11.
[23] 谭娅.燃煤固硫添加剂的实验研究及其促进固硫机理分析[D].长沙:湖南大学,2005.TAN Ya.Experiment research of additives on sulfur capture during coal combustion and analysis of mechanism on promoting effect[D].Changsha:Hunan University,2005.