超超临界660 MW机组烟道蒸发结晶脱硫废水零排放技术
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摘要
介绍了华能某发电公司新建超超临界660 MW机组烟道(主烟道和旁路烟道)蒸发结晶脱硫废水零排放技术的工艺流程、控制策略,调试期间现场试验研究了投运该零排放技术前后,空气预热器(空预器)参数、一级省煤器后给水温度、低温省煤器参数和机组主参数的变化,分析了该脱硫废水零排放系统对电除尘、脱硫水耗、输灰流动性和灰品质的影响。结果表明:该烟道蒸发结晶脱硫废水零排放技术对一级省煤器后给水温度、热一、二次风温、空预器出口排烟温度和灰品质均有一定影响,但影响较小;有利于提高电除尘效率,烟道蒸发结晶脱硫废水零排放技术安全、节能、高效,具有推广应用价值。
For the desulfurization wastewater zero discharge technology of evaporation and crystallization in flue gas in main flue duct and bypass of a newly built ultra-supercritial 660 MW unit belonging to Huaneng Group Co., Ltd., the technological process and control strategy of this technology are depicted at first. Then, the changes of parameters with the operating of zero discharge technology, including air preheater, feed water after the primary economizer, low-temperature economizer and the main steam, are studied by tests during the commissioning. The effect of this desulfurization waste water zero discharge system on the electric precipitator,water consumption of desulfurization system, liquidity and quality of coal ash are analyzed finally. The results show that, this technology has limited effect on temperature of the feed water behind the primary economizer, flue gas at outlet of the air preheater, hot primary and second wind, as well as the quality of coal ash. Therefore, this zero discharge technology is of extensive value and worthy of promotion with the advantages of safety, energy conservation and high efficiency.
For the desulfurization wastewater zero discharge technology of evaporation and crystallization in flue gas in main flue duct and bypass of a newly built ultra-supercritial 660 MW unit belonging to Huaneng Group Co., Ltd., the technological process and control strategy of this technology are depicted at first. Then, the changes of parameters with the operating of zero discharge technology, including air preheater, feed water after the primary economizer, low-temperature economizer and the main steam, are studied by tests during the commissioning. The effect of this desulfurization waste water zero discharge system on the electric precipitator,water consumption of desulfurization system, liquidity and quality of coal ash are analyzed finally. The results show that, this technology has limited effect on temperature of the feed water behind the primary economizer, flue gas at outlet of the air preheater, hot primary and second wind, as well as the quality of coal ash. Therefore, this zero discharge technology is of extensive value and worthy of promotion with the advantages of safety, energy conservation and high efficiency.
引文
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[13]黎在时,刘海峰.提高电除尘效率的辅助措施[J].电力设备,2005,6(9):22-24.LI Zaishi,LIU Haifeng.Supplementary measures on improving the efficiency of electrostatic precipitator[J].Electrical Equipment,2005,6(9):22-24.
[2]王可辉,蒋芬,徐志清,等.燃煤电厂脱硫废水零排放工艺路线研究[J].工业用水与废水,2016,47(1):9-12.WANG Kehui,JIANG Fen,XU Zhiqing,et al.Study on process route of desulfurization wastewater zero discharge from coal-fired power plant[J].Industrial Water&Wastewater,2016,47(1):9-12.
[3]郭军,别璇,贾绍广,等.脱硫废水蒸发处理自动控制与保护逻辑[J].热力发电,2016,45(9):100-104.GUO Jun,BIE Xuan,JIA Shaoguang,et al.Automatic control and protection logic for evaporation treatment of desulfurization wastewater in thermal power plants[J].Thermal Power Generation,2016,45(9):100-104.
[4]王丹,蒋道利.蒸发结晶技术在高含盐废水零排放领域的应用[J].中国井矿盐,2014(4):7-10.WANG Dan,JIANG Daoli.The application of evaporation crystallization technology in zero discharge area of high salt wastewater[J].China Well and Rock Salt,2014(4):7-10.
[5]龙国庆.燃煤电厂湿法脱硫废水蒸发结晶处理工艺的选择[J].中国给水排水,2013,29(24):5-8.LONG Guoqing.Selection of evaporation crystallization treatment process of wastewater from wet FGD in coal-fired power plant[J].China Water&Wastewater,2013,29(24):5-8.
[6]杨跃伞,苑志华,张净瑞,等.燃煤电厂脱硫废水零排放技术研究进展[J].水处理技术,2017(6):29-33.YANG Yuesan,YUAN Zhihua,ZHANG Jingrui,et al.Research progress of technologies for zero-discharge of desulfurization wastewater from coal-fired power plants[J].Technology of Water Treatment,2017(6):29-33.
[7]康梅强.脱硫废水烟道蒸发处理工艺系统设计与试验研究[D].重庆:重庆大学,2013:32.KANG Meiqiang.Study on flue gas desulfurization wastewater duct evaporation treatment system design and experiment[D].Chongqing:Chongqing University,2013:32.
[8]晋银佳,王帅,姬海宏,等.深度过滤-烟道蒸发处理脱硫废水的数值模拟[J].中国电力,2016,49(12):174-179.JIN Yinjia,WANG Shuai,JI Haihong,et al.Numerical simulation of desulfurization wastewater treatment with in-depth filtration-flue evaporation process[J].Electric Power,2016,49(12):174-179.
[9]丁圣亮.火电厂脱硫废水蒸发工艺及对烟气除尘脱硫的影响研究[D].西安:西安建筑科技大学,2015:6-7.DING Shengliang.Research of power plant desulfurization wastewater evaporation process and the impact on desulfurization and dedusting of flue gas[D].Xi’an:Xi’an University of Architecture and Technology,2015:6-7.
[10]王冬梅,程家庆,孔繁军.脱硫废水零排放技术与工艺路线[J].工业水处理,2017,37(8):109-112.WANG Dongmei,CHENG Jiaqing,KONG Fanjun.Zero discharge technology and process route of desulfurization wastewater[J].Industrial Water Treatment,2017,37(8):109-112.
[11]刘海洋,江澄宇,谷小兵,等.燃煤电厂湿法脱硫废水零排放处理技术进展[J].环境工程,2016,34(4):33-36.LIU Haiyang,JIANG Chengyu,GU Xiaobing,et al.Development of zero liquid discharge technologies for desulfurization wastewater from coal-fired power plant[J].Environmental Engineering,2016,34(4):33-36.
[12]张净瑞,刘其彬,李飞,等.燃煤电厂脱硫废水烟气余热蒸发零排放工程的设计与应用[J].电力科技与环保,2016,32(3):16-20.ZHANG Jingrui,LIU Qibin,LI Fei,et al.Design and application of flue gas duct waste heat evaporation based zero discharge technology for treatment of desulfurization wastewater from thermal power plants[J].Electric Power Technology and Environmental Protection,2016,32(3):16-20.
[13]黎在时,刘海峰.提高电除尘效率的辅助措施[J].电力设备,2005,6(9):22-24.LI Zaishi,LIU Haifeng.Supplementary measures on improving the efficiency of electrostatic precipitator[J].Electrical Equipment,2005,6(9):22-24.