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Distribution and bioavailability of mercury in size-fractioned atmospheric particles around an ultra-low emission power plant in Southwest China

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Journal of Environmental Sciences 2024年第4期138卷 141-152页

作者： Wei Zhang Jinjuan Li Hao Qiu Xingqiang Guo Zhijun Fei Yi Xing Deliang Yin College of Resources and Environmental Engineering Guizhou UniversityGuiyang 550025China College of Resources and Environmental Engineering Guizhou Institute of TechnologyGuiyang 550003China Key Laboratory of Karst Georesources and Environment(Guizhou University) Ministry of EducationGuiyang 550025China School of Energy and Environmental Engineering University of Science&Technology BeijingBeijing 100083China

ultra-low emission(ULE)technology retrofits significantly impact the particulate-bound mercury(Hg)emissions from coal-fired power plants(CFPPs);however,the distribution and bioavailability of Hg in size-fractioned particulate matter(PM)around the ULE-retrofitted CF-PPs are less understood.Here,total Hg and its chemical speciation in TSP(total suspended particles),PM_(10)(aerodynamic particle diameter≤10μm)and PM_(2.5)(aerodynamic particle diameter≤2.5μm)around a ULE-retrofitted CFPP in Guizhou Province were quantified.Atmospheric PM_(2.5)concentration was higher around this ULE-retrofitted CFPP than that in the intra-regional urban cities,and it had higher mass Hg concentration than other sizefractioned PM.Total Hg concentrations in PM had multifarious sources including CFPP,vehicle exhaust and biomass combustion,while they were significantly higher in autumn and winter than those in other seasons(Plower residual fractions(40%).Mass concentrations of exchangeable,HCl-soluble,elemental,and residual Hg in PM_(2.5)were higher than those in other size-fractioned PM,and were markedly elevated in autumn and winter(P<0.05).In PM_(2.5),HCl-soluble Hg presented a significantly positive relationship with elemental Hg(P<0.05),while residual Hg showed the significantly positive relationships with HCl-soluble Hg and elemental Hg(P<0.01).Overall,these results suggested that atmospheric PM-bound Hg around the ULE-retrofitted CFPP tends to accumulate in finer PM,and has higher bioavailable fractions,while has potential transformation between chemical speciation.

关键词： Size-fractioned particles Mercury Chemical speciation Coal-fired power plant ultra-low emission

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Practice on ultra-low emission and Energy Efficient Technologies in Coal-fired Power Plants

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Frontiers of Engineering Management 2016年第4期3卷 377-383页

作者： Yin-biao Chen Yi Zhang Wen Ling Guohua Electric Power Branch China Shenhua Energy Company Sanhe Power Generation Co.Ltd. Shenhua Group Corporation Limited

Restructuring of China's energy mix is accelerating due to factors such as energy security,economic cost,climate change and environmental pressure.Efficient and clean utilization of coal-generated power therefore plays an increasingly important role in solving energy and environmental problems in China.Coal-fired power plants,with Shenhua Guohua Sanhe as one of the pioneers,followed trend of this era and adopted multiple ultra-low emission and energy efficient technologies,striving to be an industry leader in environmental protection,profitability and innovation.As a result,coal-fired power plants have seen ultra-low emissions of air pollutants and record-high energy efficiency,opening up a new era of more efficient and cleaner coal generation.By the end of 2015,Shenhua Group had had 45 ultra-low emission coal units,providing strong support for implementing of the national policy on ultra-low emission and energy efficient retrofit of coal-fired power plants across China.

关键词： coal power generation ultra-low emission energy efficiency

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Re-understanding and Thinking about Environmental Impact of Coal-fired Power Plants under ultra-low emission

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Meteorological and Environmental Research 2018年第3期9卷 92-94,97页

作者： Su Yaoguo Wang Sheng Lun Liyong Liu Rongfeng Zhao Gang Jiang Yishan Shao Nan State Grid Shaanxi Electric Power Company Shaanxi 710048China State Power Environmental Protection Research Institute Nanjing 210031 China China International Engineering Consulting Corporation Beijing 100044Chin Jiangsu Engineering Consultation Center Nanjing 210003China

From the perspective of development background,concepts and related policies of ultra-low emission,according to work practice,some issues and difficulties that need to be paid attention to in the environmental impact assessment of ultra-low-emission thermal power projects were discussed from the aspects of evaluation criteria,evaluation grade and scope,pollution control technical lines,environmental benefit accounting,and total emission control,and corresponding recommendations were put forward.

关键词： ultra-low emission Thermal power Environmental impact assessment Discussion

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Multi-process and multi-pollutant control technology for ultra-low emissions in the iron and steel industry

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Journal of Environmental Sciences 2023年第1期123卷 83-95页

作者： Tingyu Zhu Xindong Wang Yong Yu Chao Li Qun Yao Yuran Li Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China HBIS Group Co. Ltd.Shijiazhuang 050023China ACRE Coking&Refractory Engineering Consulting Corporation MCCDalian 116085China Sinosteel Tiancheng Environmental Protection Science&Technology Co.Ltd. Wuhan 430205China

The iron and steel industry is not only an important foundation of the national economy,but also the largest source of industrial air pollution.Due to the current status of emissions in the iron and steel industry,ultra-low pollutant emission control technology has been researched and developed.Liquid-phase proportion control technology has been developed for magnesian fluxed pellets,and a blast furnace smelting demonstration project has been established to use a high proportion of fluxed pellets(80%)for the first time in China to realize source emission reduction of SO_(2)and NO_(x).Based on the characteristics of high NO_(x)concentrations and the coexistence of multiple pollutants in coke oven flue gas,low-NO_(x)combustion coupled with multi-pollutant cooperative control technology with activated carbon was developed to achieve efficient removal of multiple pollutants and resource utilization of sulfur.Based on the characteristics of co-existing multiple pollutants in pellet flue gas,selective non-catalytic reduction(SNCR)coupled with ozone oxidation and spray drying adsorption(SDA)was developed,which significantly reduces the operating cost of the system.In the light of the high humidity and high alkalinity in flue gas,filter materials with high humidity resistance and corrosion resistance were manufactured,and an integrated pre-charged bag dust collector device was developed,which realized ultralow emission of fine particles and reduced filtration resistance and energy consumption in the system.Through source emission reduction,process control and end-treatment technologies,five demonstration projects were built,providing a full set of technical solutions for ultra-low emissions of dust,SO_(2),NO_(x),SO_(3),mercury and other pollutants,and offering technical support for the green development of the iron and steel industry.

关键词： Iron and steel industry air pollution whole-process control ultra-low emission

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Angle Scattering Method for Soot Concentration Measurement under ultra-low emissions Condition

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Energy Engineering 2022年第2期119卷 511-522页

作者： Bin Yang Xingchen Zhu Jie Deng Xiaoxu Guo Jinke Han Xiaowei Liu School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai200093China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan430074China

Aiming at the problem of soot concentration measurement under ultra-low emission conditions,a forward small angle soot concentration measurement method is proposed.Taking a typical boiler emission of 0.1μm-3.0μm bimodal distribution soot as an object,the particle scatter simulation calculation under different parameters is carried out,and the influence of detection angle and particle size on the angular scatteringmeasurement of ultra-low emission soot is analyzed.The influence of detection angle and particle size on the angular scatteringmeasurement of ultra-lowemission soot is analyzed.Preferably,thewavelength of incident light is 650 nm,and the forward detection angle parameter is 15◦for the design of forward small angle soot concentration measurement system.An experimental system for measuring soot with standard concentration is built.Experiments of particle concentration measurement of 1.0μm and 3.0μm under ultra-low emission conditions are carried out.The results show that the average deviation of soot concentration measurement is less than 0.10 mg/m3 under the condition of ultra-low emission by using 15◦of forward detection,which provides an effective way for monitoring ultra-low emission soot concentration in coal-fired power plants.

关键词： emission monitoring ultra-low emission soot concentration angular scattering

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Development and technical progress in large-scale circulating fluidized bed boiler in China

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Frontiers in Energy 2020年第4期14卷 699-714页

作者： Zhong HUANG Lei DENG Defu CHE State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

Circulating fluidized bed(CFB)boilers has realized the clean and efficient utilization of inferior coal like gangue and coal slime,high sulfur coal,anthracite,petroleum coke,oil shale and other resources.As a country with the largest amount of CFB boilers and the largest installed capacity in the world,China has 440100-600 MWe CFB boilers with a total capacity of 82.29 GWe,including 227 units of 135 MWe,95 units of300 MWe,and 24 supercritical units.The statistics of typical 100-300 MWe CFB boilers showed that the average number of unplanned shut-down was only 0.37 times per year,among which the 135 MWe was 0.26 times per year and 300 MWe was 0.46 times per ycai*.The auxiliary power ratio of some 300 MWe CFB boilers based on flow-pattern reconstruction can be reduced to about 4%,which is closed to the same level of pulverized coal(PC)boilers.This paper summarizes the development process and application status of China's large-scale CFB boilers,analyzes the characteristics and technical performance of the iconic units,and introduces solutions to the problems such as water wall wear and bottom ash cooling.

关键词： CFB boiler installed capacity reliability economics ultra-low emission China

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Progress of circulating fluidized bed combustion technology in China:a review

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Clean Energy 2017年第1期1卷 36-49页

作者： Runxia Cai Xiwei Ke Junfu Lyu Hairui Yang Man Zhang Guangxi Yue Wen Ling Department of Thermal Engineering Tsinghua UniversityBeijing 100084China Shenhua Group Co.Ltd. Beijing 100011China

Circulating fluidized bed(CFB)technology plays an important role in the utilization of low-grade coal in China.This article reviews CFB combustion technology development in China and summarizes recent achievements.Since 1990 Chinese engineers and researchers have been undertaking work to improve CFB boiler technology.A completely novel CFB boiler design theory was developed and used in the domestic manufacturing of CFB boilers with various capacities.China is the largest supplier and customer of CFB boilers in the world due to the widespread use of CFB boilers.In 2007,the lower energy consumption CFB technology was successfully developed by re-specifying the fluidization state,which reduced the power consumption of forced fans and solved the potential erosion problems on the water wall.Afterwards,in order to increase the electric power generation efficiency,the supercritical CFB(SCCFB)boiler was developed and the first 600 MW SCCFB boiler was demonstrated and put into commercial operation in 2013.The success of the technology is evident with over 80 SCCFB boilers on order with capacities of 350 MW to 660 MW.Chinese scientists and engineers are also developing technology to lower the emissions of CFB combustion to meet the requirements of China’s strict emission regulations.This emission reduction is through high-efficiency desulfurization by limestone injection into the furnace and low NOx combustion,ultra-low emission of SO2 and NOx in the furnace can be realized by improving the bed quality and increasing the solid circulation rate.There is currently further research and design development being undertaken to develop a 660 MW ultra-supercritical CFB(USCCFB)boiler.The new boiler is expected to be operational before 2020 resulting in higher efficiency and lower energy consumption and emissions.

关键词： circulating fluidized bed(CFB) progress supercritical low electric consumption ultra-low emission supercritical CFB(SCCFB)

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