褐煤烟气冷凝水水质特点及其回用工艺
|
摘要
依托某电厂褐煤烟气水分冷凝回收中试装置,重点研究了冷凝换热器冷却水温度、冷却水流量和烟气流量对冷凝回收水质的影响规律,总结了冷凝水水质特点,并在此基础上,提出了烟气冷凝水回用脱硫系统及锅炉补给水系统的技术路线,完成了烟气冷凝水超滤-反渗透双膜处理工艺试验。试验结果表明:冷凝换热器冷却水温度越高、流量越小,烟气流量越大,褐煤烟气冷凝水水质越差;冷凝水总体呈较强酸性,pH值为2.63～3.51,电导率为261～1 132μS/cm,钙镁硬度、有机物质量浓度等均较低,但全铁和氨氮质量浓度稍高;采用超滤-反渗透工艺处理烟气冷凝水,产水回收率可达85%以上,电导率低于15μS/cm,且运行稳定。该研究结果可为褐煤烟气冷凝水回用的处理工艺设计提供参考。
By using a power plant's pilot device of lignite flue gas water condensation recovery, the effects of cooling water temperature, cooling water flow rate and flue gas flow rate on the quality of condensation recovery water of condensing heat exchanger were studied. The characteristics of condensate water quality were summarized. On this basis, the technical routes of flue gas condensate reuse desulfurization system and boiler water supply system were put forward, and the experiment of ultrafiltration-reverse osmosis dual membrane process for flue gas condensate was finished. The results show that, with an increase in the temperature and decrease in the cooling water flow rate, the flue gas flow rate increased and the water quality of the lignite flue gas condensate became worse. The condensate water is generally strong acidic, its pH value is 2.63～3.51, the conductivity is 261～1 132 μS/cm, the calcium and magnesium hardness and organic matter concentration are low,but the total iron and ammonia nitrogen content is slightly higher. After the reverse osmosis process was applied to treat the flue gas condensate, the recovery rate of the produced water reached over 85% with conductivity less than 15 μS/cm. The system ran stably. The research results can provide reference for treatment and reuse of the lignite flue gas condensate.
By using a power plant's pilot device of lignite flue gas water condensation recovery, the effects of cooling water temperature, cooling water flow rate and flue gas flow rate on the quality of condensation recovery water of condensing heat exchanger were studied. The characteristics of condensate water quality were summarized. On this basis, the technical routes of flue gas condensate reuse desulfurization system and boiler water supply system were put forward, and the experiment of ultrafiltration-reverse osmosis dual membrane process for flue gas condensate was finished. The results show that, with an increase in the temperature and decrease in the cooling water flow rate, the flue gas flow rate increased and the water quality of the lignite flue gas condensate became worse. The condensate water is generally strong acidic, its pH value is 2.63～3.51, the conductivity is 261～1 132 μS/cm, the calcium and magnesium hardness and organic matter concentration are low,but the total iron and ammonia nitrogen content is slightly higher. After the reverse osmosis process was applied to treat the flue gas condensate, the recovery rate of the produced water reached over 85% with conductivity less than 15 μS/cm. The system ran stably. The research results can provide reference for treatment and reuse of the lignite flue gas condensate.
引文
[1]赵奇.中国褐煤资源清洁高效利用现状[J].洁净煤技术,2018,44(2):9-14.ZHAO Qi.Clean and efficient utilization of lignite resources in China[J].Clean Coal Technology,2018,44(2):9-14.
[2]马洪业,刘晨辉,张利波,等.微波对褐煤提质干燥技术的研究现状及展望[J].昆明理工大学学报(自然科学版),2017,42(4):53-57.MA Hongye,LIU Chenhui,ZHANG Libo,et al.Research progress and prospect of microwave drying technology of lignite upgrading[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2017,42(4):53-57.
[3]尚庆雨.褐煤干燥脱水提质技术现状及发展方向[J].洁净煤技术,2014,20(6):1-4.SHANG Qingyu.Status and development direction of lignite dehydration upgrading technologies[J].Clean Coal Technology,2014,20(6):1-4.
[4]丛晓蓉,汪洋.燃煤电站锅炉烟气余热与水分联合回收技术展望与分析[J].发电与空调,2012,33(2):26-28.CONG Xiaorong,WANG Yang.Recovery technology in coal-fired power plant of heat and water from boiler flue gas[J].Power Generation&Air Condition,2012,33(2):26-28.
[5]申银丽.燃煤锅炉烟气水分回收膜传质过程研究[D].北京:华北电力大学,2016:1-3.SHEN Yinli.Study on mass transfer process of flue gas moisture recovery in coal fired boiler using membrane[D].Beijing:North China Electric Power University,2016:1-3.
[6]赵华,吴克,宁玉琴.燃煤锅炉烟气水蒸气的冷凝回收技术浅谈[J].应用能源技术,2017(8):26-29.ZHAO Hua,WU Ke,NING Yuqin.Introduction of coal-fired boiler flue gas condensation of water vapor recovery technology[J].Applied Energy Technology,2017(8):26-29.
[7]吴乃新,宋治璐,王恩禄,等.褐煤干燥提质技术比较与水分回收及余热利用方案[J].锅炉技术,2012,43(4):45-48.WU Naixin,SONG Zhilu,WANG Enlu,et al.Comparison on lignite drying and quality improvement technology as well as moisture and heat recovery and utilization plan[J].Boiler Technology,2012,43(4):45-48.
[8]雷承勇,王恩禄,黄晓宇,等.燃煤电站烟气水分回收技术试验研究[J].锅炉技术,2011,42(1):5-8.LEI Chengyong,WANG Enlu,HUANG Xiaoyu,et al.Experiment study on recovery of water steam in the flue gas of brown coal-fired power plant[J].Boiler Technology,2011,42(1):5-8.
[9]彭越宇.燃煤锅炉烟气中水分回收利用研究[D].杭州:浙江大学,2018:15-20.PENG Yueyu.Research on recovery and utilization of water from coal-fired boiler flue gas[D].Hangzhou:Zhejiang University,2018:15-20.
[10]周帅.燃气锅炉烟气余热冷凝回收研究与应用[D].济南:山东大学,2012:24:15-20.ZHOU Shuai.Heat condensate recovery research and application of gas-fired boiler flue gas[D].Ji’nan:Shandong University,2012:24:15-20.
[11]王一坤,吴利平,解冰,等.褐煤机组烟气冷凝取水污染物减排特性[J].热力发电,2017,46(12):93-98.WANG Yikun,WU Liping,XIE Bing,et al.Pollutants reduction characteristics of brown coal-fired units during water recovery from flue gas[J].Thermal Power Generation,2017,46(12):93-98.
[12]关天罡.基于冷凝换热的燃煤烟气凝水回收与污染物协同控制技术研究及应用[J].华北电力技术,2017(12):40-44.GUAN Tiangang.Technology research and engineering demonstration of the synergetic control of coal-fired flue gas condensation water and pollutants based on condensation heat transfer[J].North China Electric Power,2017(12):40-44.
[13]熊英莹,谭厚章,许伟刚,等.火电厂烟气潜热和凝结水回收的试验研究[J].热力发电,2015,44(6):77-81.XIONG Yingying,TAN Houzhang,XU Weigang,et al.Experimental study on latent heat and condensate recovery from flue gas in coal-fired power plants[J].Thermal Power Generation,2015,44(6):77-81.
[14]段俊阳,薛章涵,孙苗青,等.燃煤锅炉烟气余热及水分协同回收系统的性能分析[J].节能,2016,35(1):48-52.DUAN Junyang,XUE Zhanghan,SUN Miaoqing,et al.Performance analysis of flue gas residual heat and moisture recovery system for coal fired boilers[J].Energy Conservation,2016,35(1):48-52.
[15]靖阳,魏宏斌,邹平,等.“UF+RO双膜法”深度处理焦化废水的工程应用研究[J].环境工程,2017,35(增刊1):172-176.JING Yang,WEI Hongbin,ZOU Ping,et al.The engineering study on advanced treatment of coking wastewater by double membrane method[J].Environmental Engineering,2017,35(Suppl.1):172-176.
[16]翟继超,程方,张海瑶,等.混凝-沉淀与混凝-气浮用于海水浸没式膜过滤的对比研究[J].水处理技术,2016,42(12):103-107.ZHAI Jichao,CHENG Fang,ZHANG Haiyao,et al.Comparative study of coagulation sedimentation and coagulation air floatation for seawater submerged membrane filtration[J].Water Treatment Technology,2016,42(12):103-107.
[17]孙立娇,叶治安,胡特立,等.电厂工业废水处理后回用于脱硫工艺水的试验研究[J].中国电力,2017,50(9):135-137.SUN Lijiao,YE Zhian,HU Teli,et al.Feasibility analysis on reusing treated industrial wastewater for desulfurization process water in power plants[J].Electric Power,2017,50(9):135-137.
[18]谢春霞,邹向群.回用水用于湿法脱硫系统工艺水的水质要求[J].电力科技与环保,2013,29(2):23-25.XIE Chunxia,ZOU Xiangqun.Water quality specification of reclaimed water used as process water of flue gas desulphurization system[J].Power Technology and Environmental Protection,2013,29(2):23-25.
[2]马洪业,刘晨辉,张利波,等.微波对褐煤提质干燥技术的研究现状及展望[J].昆明理工大学学报(自然科学版),2017,42(4):53-57.MA Hongye,LIU Chenhui,ZHANG Libo,et al.Research progress and prospect of microwave drying technology of lignite upgrading[J].Journal of Kunming University of Science and Technology(Natural Science Edition),2017,42(4):53-57.
[3]尚庆雨.褐煤干燥脱水提质技术现状及发展方向[J].洁净煤技术,2014,20(6):1-4.SHANG Qingyu.Status and development direction of lignite dehydration upgrading technologies[J].Clean Coal Technology,2014,20(6):1-4.
[4]丛晓蓉,汪洋.燃煤电站锅炉烟气余热与水分联合回收技术展望与分析[J].发电与空调,2012,33(2):26-28.CONG Xiaorong,WANG Yang.Recovery technology in coal-fired power plant of heat and water from boiler flue gas[J].Power Generation&Air Condition,2012,33(2):26-28.
[5]申银丽.燃煤锅炉烟气水分回收膜传质过程研究[D].北京:华北电力大学,2016:1-3.SHEN Yinli.Study on mass transfer process of flue gas moisture recovery in coal fired boiler using membrane[D].Beijing:North China Electric Power University,2016:1-3.
[6]赵华,吴克,宁玉琴.燃煤锅炉烟气水蒸气的冷凝回收技术浅谈[J].应用能源技术,2017(8):26-29.ZHAO Hua,WU Ke,NING Yuqin.Introduction of coal-fired boiler flue gas condensation of water vapor recovery technology[J].Applied Energy Technology,2017(8):26-29.
[7]吴乃新,宋治璐,王恩禄,等.褐煤干燥提质技术比较与水分回收及余热利用方案[J].锅炉技术,2012,43(4):45-48.WU Naixin,SONG Zhilu,WANG Enlu,et al.Comparison on lignite drying and quality improvement technology as well as moisture and heat recovery and utilization plan[J].Boiler Technology,2012,43(4):45-48.
[8]雷承勇,王恩禄,黄晓宇,等.燃煤电站烟气水分回收技术试验研究[J].锅炉技术,2011,42(1):5-8.LEI Chengyong,WANG Enlu,HUANG Xiaoyu,et al.Experiment study on recovery of water steam in the flue gas of brown coal-fired power plant[J].Boiler Technology,2011,42(1):5-8.
[9]彭越宇.燃煤锅炉烟气中水分回收利用研究[D].杭州:浙江大学,2018:15-20.PENG Yueyu.Research on recovery and utilization of water from coal-fired boiler flue gas[D].Hangzhou:Zhejiang University,2018:15-20.
[10]周帅.燃气锅炉烟气余热冷凝回收研究与应用[D].济南:山东大学,2012:24:15-20.ZHOU Shuai.Heat condensate recovery research and application of gas-fired boiler flue gas[D].Ji’nan:Shandong University,2012:24:15-20.
[11]王一坤,吴利平,解冰,等.褐煤机组烟气冷凝取水污染物减排特性[J].热力发电,2017,46(12):93-98.WANG Yikun,WU Liping,XIE Bing,et al.Pollutants reduction characteristics of brown coal-fired units during water recovery from flue gas[J].Thermal Power Generation,2017,46(12):93-98.
[12]关天罡.基于冷凝换热的燃煤烟气凝水回收与污染物协同控制技术研究及应用[J].华北电力技术,2017(12):40-44.GUAN Tiangang.Technology research and engineering demonstration of the synergetic control of coal-fired flue gas condensation water and pollutants based on condensation heat transfer[J].North China Electric Power,2017(12):40-44.
[13]熊英莹,谭厚章,许伟刚,等.火电厂烟气潜热和凝结水回收的试验研究[J].热力发电,2015,44(6):77-81.XIONG Yingying,TAN Houzhang,XU Weigang,et al.Experimental study on latent heat and condensate recovery from flue gas in coal-fired power plants[J].Thermal Power Generation,2015,44(6):77-81.
[14]段俊阳,薛章涵,孙苗青,等.燃煤锅炉烟气余热及水分协同回收系统的性能分析[J].节能,2016,35(1):48-52.DUAN Junyang,XUE Zhanghan,SUN Miaoqing,et al.Performance analysis of flue gas residual heat and moisture recovery system for coal fired boilers[J].Energy Conservation,2016,35(1):48-52.
[15]靖阳,魏宏斌,邹平,等.“UF+RO双膜法”深度处理焦化废水的工程应用研究[J].环境工程,2017,35(增刊1):172-176.JING Yang,WEI Hongbin,ZOU Ping,et al.The engineering study on advanced treatment of coking wastewater by double membrane method[J].Environmental Engineering,2017,35(Suppl.1):172-176.
[16]翟继超,程方,张海瑶,等.混凝-沉淀与混凝-气浮用于海水浸没式膜过滤的对比研究[J].水处理技术,2016,42(12):103-107.ZHAI Jichao,CHENG Fang,ZHANG Haiyao,et al.Comparative study of coagulation sedimentation and coagulation air floatation for seawater submerged membrane filtration[J].Water Treatment Technology,2016,42(12):103-107.
[17]孙立娇,叶治安,胡特立,等.电厂工业废水处理后回用于脱硫工艺水的试验研究[J].中国电力,2017,50(9):135-137.SUN Lijiao,YE Zhian,HU Teli,et al.Feasibility analysis on reusing treated industrial wastewater for desulfurization process water in power plants[J].Electric Power,2017,50(9):135-137.
[18]谢春霞,邹向群.回用水用于湿法脱硫系统工艺水的水质要求[J].电力科技与环保,2013,29(2):23-25.XIE Chunxia,ZOU Xiangqun.Water quality specification of reclaimed water used as process water of flue gas desulphurization system[J].Power Technology and Environmental Protection,2013,29(2):23-25.