Article
Environmental Sciences
Guihao Yin, Qinwu Li, Zhongyang Zhao, Lianmin Li, Longchao Yao, Weiguo Weng, Chenghang Zheng, Jiangang Lu, Xiang Gao
Summary: An accurate NOx concentration prediction model is crucial for low NOx emission control in power stations to comply with environmental policies. This study utilizes LSTM models to predict NOx concentrations at different operating conditions, proposing a composite model for improved accuracy. Results show that the composite LSTM model outperforms single LSTM and other non-time-sequence models in predicting NOx concentration and fluctuation trends.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Review
Energy & Fuels
Pieter Rousseau, Ryno Laubscher, Brad Travis Rawlins
Summary: Integrated whole-boiler process models are useful in boiler design and analysis of different scenarios. One-dimensional thermofluid network models are necessary for analyzing the overall performance. This review paper aims to provide a summary of recent literature on boiler modeling, describe the thermofluid network modeling methodology, and demonstrate its application in case studies.
Article
Engineering, Multidisciplinary
Hariana, Prabowo, Edi Hilmawan, Fairuz Milky Kuswa, Arif Darmawan, Muhammad Aziz
Summary: This paper comprehensively investigates the combustion performances and slagging and fouling behaviors during cofiring biomass and coal. The results show that cofiring coal with 25% biomass has the best combustion performance.
AIN SHAMS ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Yali Tong, Jiajia Gao, Tao Yue, Xiaoxi Zhang, Jieyu Liu, Jie Bai
Summary: This study investigated the distribution, chemical fractionation, and potential environmental risks of heavy metals in waste from ultra-low emission coal-fired boilers. The results showed that fly ash was enriched with heavy metals, while its chromium contents were not always higher than those of slag. Fly ash was the main output flow for heavy metals in the tested boilers, and the proportions of heavy metals were higher in the fly ash than in the flue gas. The potential environmental risks of heavy metals in different waste products showed spatial heterogeneity in the study region.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Jingfan Zheng, Jing Wang, Fengling Yang, Zhiping Du, Fangqin Cheng
Summary: Selective non-catalytic reduction (SNCR) with NH3 as the reducing agent is commonly used for denitrification in coal-fired boilers. In this study, the mechanisms of NH3 adsorption and reactions on coal ash were investigated. The adsorption capacity of lignite ash was higher than that of anthracite ash due to its larger specific surface area and surface acidity. At temperatures between 450-850 degrees C, coal ash exhibited catalytic activity for NH3 decomposition and oxidation. NH3 adsorbed over acid sites on coal ash and underwent hydrogen abstraction to produce intermediates, which then reacted with the surface lattice oxygen of coal ash to produce NO and N2O.
Article
Thermodynamics
Xiaoqiang Wen, Kaichuang Li, Jianguo Wang
Summary: In this paper, new ensemble learning methods are proposed to predict NOx concentration at the SCR inlet in coal-fired boilers. Three kinds of single models are constructed as base learners, and their model structures and parameters are optimized. The presented ensemble models have excellent prediction accuracy and generalization, as verified by experimental results using a different dataset.
Article
Engineering, Multidisciplinary
Yan Xie, Xin Liu, Chaoqun Zhang, Jun Zhao, Heyang Wang
Summary: The paper introduces a coupled heat transfer model for coal-fired boilers to predict boiler steam temperatures under different design and operation conditions. The model ensures consistency between the heat transfer solution on the fire side and the steam temperature changes, serving as an efficient predictive tool for engineering boiler problems.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2021)
Article
Environmental Sciences
Jingjing Yuan, Ruoyu Sun, Ruwei Wang, Biao Fu, Mei Meng, Wang Zheng, Jiubin Chen
Summary: The study reveals that modern coal-fired boilers with denitrification devices exhibit different Hg isotope fractionation effects compared to traditional boilers without denitrification devices. Significant enrichment of heavy Hg isotopes in combustion products was observed, which increased with sequential removal of combustion products.
ENVIRONMENTAL POLLUTION
(2021)
Article
Chemistry, Applied
Yibin Wang, Meng Wang, Houzhang Tan, Guohui Lin, Hu Sheng, Chengliang Wang, Zuwang Yang, Sicong Zhang
Summary: This study examined the chemical characteristics of eight types of deposits collected from water-wall tubes of three pulverized coal boilers. Through thermodynamic calculations, the study analyzed the enrichment of Pb and Zn in the deposits and clarified the deposition mechanism of Pb- or Zn-rich particles. The results suggest that the mole ratio of S to Pb + Zn in deposits could be used as a quick evaluation of sulfide corrosion.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Environmental Sciences
Yali Tong, Kun Wang, Jiajia Gao, Tao Yue, Penglai Zuo, Chenlong Wang, Li Tong, Xiaoxi Zhang, Yun Zhang, Quanming Liang, Jieyu Liu
Summary: Coal-fired industrial boilers are a significant source of mercury emissions. This study assessed the mercury flow of these boilers in China, and established an inventory of mercury output from waste products. The findings showed that smaller boilers were the dominant source of mercury, and regions in North China, Northeast China, and Northwest China had high atmospheric mercury emissions.
AIR QUALITY ATMOSPHERE AND HEALTH
(2022)
Article
Engineering, Multidisciplinary
Wenyuan Xue, Zhenhao Tang, Shengxian Cao, Manli Lv, Zhi Wang, Bo Zhao, Gong Wang, Yichen Lu
Summary: Predicting furnace temperature distribution is crucial for the safety of coal-fired boilers. This article proposes a 3D combustion temperature field prediction and correction method based on GDNN, which achieves high performance and practicality according to experimental results.
Article
Energy & Fuels
Dan Peng, Ben Wang, Xingfei Cai, Lei Bei
Summary: By adapting different types of coal in the power generation unit, the problems of high flue gas temperature, low boiler efficiency, and high NOx emissions can be solved. Changing to bituminous coal increased burn-out efficiency and reducing the volatile content. The addition of a low-temperature economizer also helped to reduce flue gas temperature and increase boiler efficiency. After the modification, NOx emissions were greatly reduced, as well as coal consumption and carbon dioxide emissions.
Article
Materials Science, Multidisciplinary
Xiaofeng Yang, Yaxin Xu, Jintao Lu, Jinyang Huang, Yingying Dang, Wenya Li
Summary: The influence of fireside corrosion on the creep rupture of a Ni-Fe based model alloy was investigated. Results showed that the rupture life in fireside corrosion was only 40% of that in air. Internal sulfidation along grain boundaries promoted the initiation of intergranular cracks and resulted in premature rupture. Surface collapse in fireside corrosion was attributed to the outward propagation of internal cracks, while surface cracks in air were due to the formation of recrystallized grains in the surface layer.
Article
Environmental Sciences
Jiajia Gao, Kun Wang, Yali Tong, Tao Yue, Chenlong Wang, Penglai Zuo, Jieyu Liu
Summary: Coal-fired industrial boilers are a significant source of trace metals emissions in China. A high-resolution emission inventory for Hg, As, Cd, Cr, and Pb in 2017 was established based on data from over 61,000 CFIBs. The study found that emissions were concentrated in northern and eastern regions, with seasonal variations and an overall decrease in emissions due to control measures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xiaolin Wu, Wenbin Liu, Hanfei Gao, David Alfaro, Shurui Sun, Rongrong Lei, Tianqi Jia, Minghui Zheng
Summary: Coal-fired power plants are significant sources of PAH emissions, with different air pollution control devices showing varying effects on PAH emissions. WESPs and LLT-ESPs were found to be effective in reducing PAH emissions, offering potential for adoption in other plants for PAH reduction.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Toshimi Nakajima, Mao Kuragano, Makoto Yamada, Ryo Sugimoto
Summary: This study compared the contribution of submarine groundwater discharge (SGD) to river nutrient budgets at nearshore and embayment scales, and found that SGD-derived nutrients become more important at larger spatial scales.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Fan Liu, Lei Zhang, Chongyang Zhang, Ziguang Chen, Jingguang Li
Summary: NO2 emissions from wall-mounted gas stoves used for household heating have become a significant source of indoor pollution in Chinese urban areas. The high indoor concentration of NO2 poses potential health risks to residents. It is urgently necessary to establish relevant regulations and implement emission reduction technologies to reduce NO2 emissions from wall-mounted gas stoves.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Letter
Environmental Sciences
Hans Peter H. Arp, Raoul Wolf, Sarah E. Hale, Sivani Baskaran, Juliane Gluege, Martin Scheringer, Xenia Trier, Ian T. Cousins, Harrie Timmer, Roberta Hofman-Caris, Anna Lennquist, Andre D. Bannink, Gerard J. Stroomberg, Rosa M. A. Sjerps, Rosa Montes, Rosario Rodil, Jose Benito Quintana, Daniel Zahn, Herve Gallard, Tobias Mohr, Ivo Schliebner, Michael Neumann
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Philomina Onyedikachi Peter, Binessi Edouard Ifon, Francois Nkinahamira, Kayode Hassan Lasisi, Jiangwei Li, Anyi Hu, Chang-Ping Yu
Summary: This study investigates the relationship between dissolved organic matter (DOM) and Rare Earth Elements (REEs) in sediments from Yundang Lagoon, China. The results show four distinct fluorescent components, with protein-like substances being the most prevalent. Additionally, the total fluorescence intensity and LREE concentrations exhibit a synchronized increase from Outer to Inner to Songbai Lake core sediments. The findings demonstrate a strong correlation between DOM content and pollution levels.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Surya Gupta, Pasquale Borrelli, Panos Panagos, Christine Alewell
Summary: The objective of this study is to incorporate soil hydraulic properties into the erodibility factor (K) of USLE-type models. By modifying and improving the existing equations for soil texture and permeability, the study successfully included information on saturated hydraulic conductivity (Ksat) into the calculation of K factor. Using the Random Forest machine learning algorithm, two independent K factor maps with different spatial resolutions were generated. The results show that the decrease in K factor values has a positive impact on the modeling of soil erosion rates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jesmin Akter, Wendy J. M. Smith, Yawen Liu, Ilho Kim, Stuart L. Simpson, Phong Thai, Asja Korajkic, Warish Ahmed
Summary: The choice of workflow in wastewater surveillance has a significant impact on SARS-CoV-2 concentrations, while having minimal effects on HF183 and no effect on HAdV 40/41 concentrations. Certain components in the workflow can be interchangeable, but factors such as buffer type, chloroform, and homogenization speed can affect the recovery of viruses and bacteria.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yu Luo, Xueting Yang, Diwei Wang, Hongmei Xu, Hongai Zhang, Shasha Huang, Qiyuan Wang, Ningning Zhang, Junji Cao, Zhenxing Shen
Summary: Atmospheric PM2.5, which can generate reactive oxygen species (ROS), is associated with cardiorespiratory morbidity and mortality. The study found that both the mass concentration of PM2.5 and the DTT activity were higher during the heating season than during the nonheating season. Combustion sources were the primary contributors to DTT activity during the heating season, while secondary formation dominated during the nonheating season. The study also revealed that biomass burning had the highest inherent oxidation potential among all sources investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Erin L. Murphy, Leah R. Gerber, Chelsea M. Rochman, Beth Polidoro
Summary: Plastic pollution has devastating consequences for marine organisms. This study uses a trait-based framework to develop a vulnerability index for marine mammals, seabirds, and sea turtles in Hawai'i. The index ranks 63 study species based on their vulnerability to macroplastic pollution, providing valuable information for species monitoring and management priorities.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Kenji Maurice, Amelia Bourceret, Sami Youssef, Stephane Boivin, Liam Laurent-Webb, Coraline Damasio, Hassan Boukcim, Marc-Andre Selosse, Marc Ducousso
Summary: Growing pressure from climate change and agricultural land use is destabilizing soil microbial community interactions. Little is known about microbial community resistance and adaptation to disturbances, hindering our understanding of recovery latency and implications for ecosystem functioning. This study found that anthropic disturbance and natural disturbance have different effects on the topology and stability of soil microbial networks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Yunhao Li, Yali Feng, Haoran Li, Yisong Yao, Chenglong Xu, Jinrong Ju, Ruiyu Ma, Haoyu Wang, Shiwei Jiang
Summary: Deep-sea mining poses a serious threat to marine ecosystems and human health by disturbing sediment and transmitting metal ions through the food chain. This study developed a new regenerative adsorption material, OMN@SA, which effectively removes metal ions. The adsorption mechanism and performance of the material for metal ion fixation were investigated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Antonio Medici, Margherita Lavorgna, Marina Isidori, Chiara Russo, Elena Orlo, Giovanni Luongo, Giovanni Di Fabio, Armando Zarrelli
Summary: Valsartan, a widely used antihypertensive drug, has been detected in high concentrations in surface waters due to its unchanged excretion and incomplete degradation in wastewater treatment plants. This study investigated the degradation of valsartan and identified 14 degradation byproducts. The acute and chronic toxicity of these byproducts were evaluated in key organisms in the freshwater trophic chain.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Jiang Lin, Lianbao Chi, Qing Yuan, Busu Li, Mingbao Feng
Summary: This study investigated the photodegradation behavior and product formation of two representative pharmaceuticals in simulated estuary water. The study found that the formed transformation products of these pharmaceuticals have potential toxicity on marine organisms, including oxidative stress and damage to cellular components.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Hua Fang, Dongdong Jiang, Ye He, Siyi Wu, Yuehong Li, Ziqi Zhang, Haoting Chen, Zixin Zheng, Yan Sun, Wenxiang Wang
Summary: This study revealed that exposure to lower levels of air pollutants led to decreased pregnancy rates, with PM10, NO2, SO2, and CO emerging as the four most prominent pollutants. Individuals aged 35 and above exhibited heightened susceptibility to pollutants.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Ali Shaan Manzoor Ghumman, Rashid Shamsuddin, Amin Abbasi, Mohaira Ahmad, Yoshiaki Yoshida, Abdul Sami, Hamad Almohamadi
Summary: In this study, inverse vulcanized polysulfides (IVP) were synthesized by reacting molten sulfur with 4-vinyl benzyl chloride, and then functionalized using N-methyl D-glucamine (NMDG). The functionalized IVP showed a high mercury adsorption capacity and a machine learning model was developed to predict the amount of mercury removed. Furthermore, the functionalized IVP can be regenerated and reused, providing a sustainable and cost-effective adsorbent.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Rita Bonfiglio, Renata Sisto, Stefano Casciardi, Valeria Palumbo, Maria Paola Scioli, Erica Giacobbi, Francesca Servadei, Gerry Melino, Alessandro Mauriello, Manuel Scimeca
Summary: This study investigated the presence of aluminum in human colon cancer samples and its potential association with biological processes involved in cancer progression. Aluminum was found in tumor areas of 24% of patients and was associated with epithelial to mesenchymal transition (EMT) and cell death. Additional analyses revealed higher tumor mutational burden and mutations in genes related to EMT and apoptosis in aluminum-positive colon cancers. Understanding the molecular mechanisms of aluminum toxicity may improve strategies for the management of colon cancer patients.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)