中国四个超低排放电厂的一次碳质颗粒物排放
Primary Carbonaceous Particle Emission from Four Power Plants with Ultralow Emission in China.
作者信息
Lyu Ruihe, Zhang Jinsheng, Wu Jianhui, Feng Yinchang
机构信息
College of Marine Resources and Environment, Hebei Normal University of Science & Technology, Qinhuangdao, Hebei 066004, China.
State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
出版信息
ACS Omega. 2021 Jan 7;6(2):1309-1315. doi: 10.1021/acsomega.0c04754. eCollection 2021 Jan 19.
Particulate matters (PMs) were collected in stacks from two types of ultralow emission coal-fired power plants by a heated electrical low-pressure impactor (HT-ELPI), including ultralow emission pulverized combustion technology boilers (ULPCBs) and ultralow emission circulating fluidized bed boilers (ULCFBs). The characteristics of organic carbon (OC) and elemental carbon (EC) in size-resolved particles were analyzed. The ultralow emission technologies significantly decreased the mass concentrations of the carbonaceous content, and the emission concentrations of OC and EC ranged from 5.64 to 17.9 μg/m for ULPCBs and from 0.57 to 1.85 μg/m for ULCFBs. However, the number concentration of particles was not significantly decreased in the four ultralow emission power plants. The OC in the particle emission of ULPCBs presents a bimodal size distribution with the particle size, while three successive unimodal distributions were observed in the ULCFB emission. Compared to ULPCBs, much more char-EC and soot-EC condensed in the particles, which were collected from ULCFBs. Furthermore, the char-EC/soot-EC in the particle fractions of ULPCBs characterized by the "V" type with the sequence of PM > PM > PM, differing from the PM > PM > PM of ULCFBs. The ratios of OC/EC in the stacks from two types of boilers did not show obvious variations in particle size distributions, and the mean OC/EC was far higher than those for non-ultralow emission power plants. Considering the impact of OC, OC, and EC, the ratio of high-temperature organic carbon (HTOC, defined as OC + OC) and soot-EC was studied. The HTOC/soot-EC increased with the increase of RH in the stack, and the highest HTOC/soot-EC values were obtained from ULPCBs (33.0% (PM), 11.4% (PM), and 23.9% (PM)). Meanwhile, strong correlations (0.69-0.85, < 0.001) between HTOC and soot-EC were obtained, implying that HTOC and soot-EC probably simultaneously condensed in the purification equipment.
采用热式低压冲击器（HT-ELPI）从两种超低排放燃煤电厂的烟囱中采集颗粒物（PMs），这两种电厂包括超低排放煤粉燃烧技术锅炉（ULPCBs）和超低排放循环流化床锅炉（ULCFBs）。分析了粒径分辨颗粒中有机碳（OC）和元素碳（EC）的特征。超低排放技术显著降低了含碳物质的质量浓度，ULPCBs的OC和EC排放浓度范围为5.64至17.9μg/m³，ULCFBs的排放浓度范围为0.57至1.85μg/m³。然而，在这四个超低排放电厂中，颗粒物的数量浓度并未显著降低。ULPCBs颗粒物排放中的OC呈现出随粒径的双峰分布，而在ULCFBs排放中观察到三个连续的单峰分布。与ULPCBs相比，从ULCFBs收集的颗粒物中凝聚了更多的焦炭-EC和烟灰-EC。此外，ULPCBs颗粒级分中的焦炭-EC/烟灰-EC呈现“V”型，顺序为PM₂.₅＞PM₁₀＞PM₁，这与ULCFBs的PM₂.₅＞PM₁＞PM₁₀不同。两种锅炉烟囱中OC/EC的比值在粒径分布上没有明显变化，且平均OC/EC远高于非超低排放电厂。考虑到OC、OC和EC的影响，研究了高温有机碳（HTOC，定义为OC + OC）与烟灰-EC的比值。HTOC/烟灰-EC随烟囱中相对湿度（RH）的增加而增加，ULPCBs获得了最高的HTOC/烟灰-EC值（PM₂.₅为33.0%，PM₁₀为11.4%，PM₁为23.9%）。同时，HTOC与烟灰-EC之间存在强相关性（0.69 - 0.85，p＜0.001），这意味着HTOC和烟灰-EC可能在净化设备中同时凝聚。
Zotero 插件