1000 MW燃煤机组变负荷环境影响评价
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摘要
随着非化石能源发电占比的提高,燃煤机组频繁参与电网调峰,机组长时间处于变负荷运行状态。本文以1000 MW超超临界燃煤机组为研究对象,建立了不同运行负荷下的污染物排放清单,分析了机组变负荷运行对环境的影响规律。结果表明:光化学臭氧合成和全球变暖对环境的影响程度较大,两者占总环境影响潜值的82%左右。随着负荷从BMCR降低到40%THA,总环境影响潜值逐渐增大,即对环境的影响程度逐渐增加。这主要是因为生产单位电量所燃用的煤量逐渐增大,且低负荷下脱硝效率急剧下降。40%THA与BMCR相比,总环境影响潜值约增加了34%。
With the increase of the proportion of non-fossil fuels in power generation, coal-fired units play an important role in load cycling of power grid more and more frequently, leading to off-design operation conditions for a long time. In this study, the pollutant emission inventory of a 1000 MW ultra-supercritical coal-fired unit is calculated, and its influence on the environment is discussed.The results show that the Photochemical ozone creation potential and global warming potential are dominant factors which have a contribution of about 82% in the total environmental impact potential.With the decrease of load from BMCR to 40%THA, the total environmental impact potential increases gradually, indicating an increasing influence of the power plant on the environment. This is mainly because of the increase in the amount of coal used in 1 kWh power, and the denitrification efficiency decreases sharply under low loads. The total environmental impact potential under 40%THA load is about 34% larger than that under BMCR load.
With the increase of the proportion of non-fossil fuels in power generation, coal-fired units play an important role in load cycling of power grid more and more frequently, leading to off-design operation conditions for a long time. In this study, the pollutant emission inventory of a 1000 MW ultra-supercritical coal-fired unit is calculated, and its influence on the environment is discussed.The results show that the Photochemical ozone creation potential and global warming potential are dominant factors which have a contribution of about 82% in the total environmental impact potential.With the decrease of load from BMCR to 40%THA, the total environmental impact potential increases gradually, indicating an increasing influence of the power plant on the environment. This is mainly because of the increase in the amount of coal used in 1 kWh power, and the denitrification efficiency decreases sharply under low loads. The total environmental impact potential under 40%THA load is about 34% larger than that under BMCR load.
引文
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[2]周亮亮,刘朝.洁净燃煤发电技术全生命周期评价[J].中国电机工程学报,2011,31(2):7-14ZHOU Liangliang, LIU Chao. Assessment on Whole Life Cycle of Clean Coal-Fired Power Generation Technology[J]. Proceeding of the CSEE, 2011, 31(2):7-14
[3]刘朝,周亮亮,解辉,等.1000 MW超超临界水冷和空冷机组生命局期评价[J].工程热物理学报,2012, 33(5):748-752LIU Chao, ZHOU Liangliang, XIE Hui, et al. Assessment on Life Cycle of Water-Cooled and Air-Cooled Ultra-Supercritical Power Generation Technology[J]. Journal of Engineering Thermophysics, 2012, 33(5):748-752
[4]张莉,王俏丽,潘淑萍,等.基于燃煤烟气污染物深度处理的电厂系统生命周期评价[J].高校化学工程学报,2016, 30(3):700-708ZHANG Li, WANG Qiaoli, PAN Shuping, et al. Life Cycle Assessment of Power Plants with Coal-Fire Flue Gas Advanced Treatments[J]. Journal of Chemical Engineering of Chinese Universities, 2016, 30(3):700-708
[5] HAN Xiaoqu, LIU Ming, ZHAI Mengxu, et al. Investigation on the Off-Design Performances of Flue Gas PreDried Lignite-Fired Power System Integrated with Waste Heat Recovery at Variable External Working Conditions[J].Energy, 2015, 90:1743-1758
[6] DI Xianghua, NIE Zuoren, YUAN Baorong, et al. Life Cycle Inventory for Electricity Generation in China[J]. International Journal of Life Cycle Assessment, 2007, 12(4):217-224
[7]杨建新,徐成,王如松.产品生命周期评价方法及应用[M].北京:气象出版社,2002:79-123YANG Jianxin, XU Cheng, WANG Rusong. Product Life Cycle Assessment and Application[M]. Beijing:Metcorological Press, 2002:79-123
[8]林永明.大型石灰石_石膏湿法喷淋脱硫技术研究及工程应用[D].杭州:浙江大学,2006LIN Yongming. Study on Large Scale Limestone-Gypsum Spraying Desulphurization Technology and Project Application[D]. Hangzhou:Zhejiang University, 2006
[9] CHEN Weixiong, LI Bingxin, ZHANG Shuangping, et al. Simulation Investigation on the Design and Operation Strategy of a 660 MW Coal-Fired Power Plant Coupled with a Steam Ejector to Ensure NO_x Reduction Ability[J].Applied Thermal Engineering, 2017, 124:1103-1111
[10]张双平,李冰心,严俊杰,等.660 MW机组升负荷对脱硝及除尘影响研究[J].工程热物理学报,2017, 38(6):1-6ZHANG Shuangping, LI Bingxin, YAN Junjie, et al. Simulation on the Influence of a 660 MW Unit Load-Up Processes on Denitrification and Particle Removal[J]. Journal of Engineering Thermophysics, 2017, 38(6):1-6