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Study of LPG Release & dispersion model

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China Petroleum Processing & Petrochemical Technology 2003年第2期5卷 39-42页

作者： MuShanjun PengXiangwei OceanUniversityofChina TsingdoShandong266003 SINOPECResearchInstituteofSafetyEngineering TsingdaoShandong266071

The current applicable release & dispersion models are reviewed. A typical model is developed on the basis of LPG storage conditions in China and the authors' research. The study is focused on the relationship between LPG composition and release rate, and on the influence of buildings or structures located in the surrounding area on the dispersion of gas plume. The established model is compared with existing models by the use of published field test data.

关键词： LPG release dispersion model

Using the OSPM model on Pollutant dispersion in an Urban Street Canyon

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Advances in Atmospheric Sciences 2010年第3期27卷 621-628页

作者：胡伟钟秦 School of Chemical Engineering Nanjing University of Science and Technology

An observational campaign was conducted in the street canyon of Zhujiang Road in Nanjing city in 2007. Hourly mean concentrations of PM10 were measured at street and roof levels. The Operational Street Pollution model （OSPM） street canyon dispersion model was used to calculate the street concentrations and the results were compared with the measurements. The results show that there is good agreement between measured and predicted concentrations. The correlation coefficient R2 values （R2 is a measure of the correlation of the predicted and measured time series of concentrations） are 0.5319, 0.8044, and 0.6630 for the scatter plots of PM10 corresponding to light wind speed conditions, higher wind speed conditions, and all wind speed conditions, respectively. PM10 concentrations tend to be smaller for the higher wind speed cases and decrease rapidly with increasing wind speed. The presentations of measured and modelled concentration dependence on wind direction show fairly good agreement. PM10 concentrations measured on the windward side are relatively smaller, compared with the corresponding results for the leeward side. This study demonstrates that it is possible to use the OSPM to model PM10 dispersion rules for an urban street canyon.

关键词： street canyon PM10 dispersion model OSPM

Application of the ISCST3 model for predicting PCDD/F concentrations in agricultural soil in the vicinity of a MSWI plant in China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第3期9卷 373-380页

作者： Meng-xia XU Jian-hua YAN Sheng-yong LU Xiao-dong LI Tong CHEN Ming-jiang NI Hui-fen DAI Ke-fa CEN State Key Laboratory of Clean Energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China School of Medicine Zhejiang University Hangzhou 310058 China

Based on the Industrial Source Complex Short-Term Version 3 （ISCST3） model, a simplified modeling approach was developed to predict concentrations of congeners of polychlorinated-p-dioxins and dibenzofurans （PCDD/Fs） of agricultural soil, within a radius of 3 kin from a municipal solid waste incinerator （MSWI） plant after its 4-year operation in Hangzhou, China. Comparisons were made between the measured and estimated congener-specific concentrations and the international-toxic equivalent （I-TEQ） values of soil samples with respect to distance from the stack. The results indicate that the predictions of soil PCDD/F concentrations and K-TEQ values were generally lower than their observations, and that the higher the degree of underestimation seems, the greater the further downwind one gets. Nevertheless, most of the predictions were in good agreement with the trend of measured ones and were within a factor of ten for samples located within 1 kin of the plant. Besides, analysis of contributions of various deposition pathways confirms that in addition to wet particle deposition, the dry gaseous deposition is essential for realistic prediction of PCDD/F depositions to soil, especially for tetra- and penta-chlorinated dioxins.

关键词： Agricultural soil dispersion model ISCST3 Municipal solid waste incinerator (MSWI) Polychlorinated-p-dioxins and dibenzofurans (PCDD/Fs)

Evaluating population exposure to N,N-dimethylformamide in as mall industrial area accounting for population movement

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第10期12卷 794-806页

作者： Yu-mei WEI Wei-li TIAN Qing-yu ZHANG Ying-yue ZHENG Yi-ke YANG Zu-cheng WU Qi ZHU Lei ZHOU Si-mai FANG Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Zhejiang Provincial Engineering Research Center of Industrial Boiler ＆ Furnace Flue Gas Pollution Control Hangzhou 311202 China Management Office of the New Rural Cooperative Medical Service Longwan District Health Bureau Wenzhou 325011 China Department of Information Management University of International Business and Economics Beijing 100029 China

Population exposure to pollutants is important for studies on the exposure-response relationship. However, it is difficult to evaluate population exposure to non-conventional pollutants due to limited data on concentration levels and the movement patterns of inhabitants. In this study, an air dispersion model was used to simulate N, N-dimethylformarnide （DMF） concentrations, as a proxy to monitoring concentrations. A total of 1289 randomly selected household representatives were surveyed to obtain information on movement characteristics. Subsequently, population movement patterns were combined with DMF concentration levels on maps of 100 m× 100 m resolution to calculate population exposure. During 2008, the estimated population exposure to DMF ranged from 0.002 to 0.64 mg/m^3. The highest level of population exposure to DMF was found in the north and northwest sub-districts of the study area, ranging from 0.42 to 0.64 mg/m^3. The population exposure to DMF for different occupational groups indicated that retired people and farmers were vulnerable subpopulations among people highly exposed to DME This was mainly because they spent most time at home where the DMF concentration was high. As pollutant concentrations were divided into small grids, we found that exposure levels were substantially impacted by population movement characteristics.

关键词： Volatile organic compound dispersion model Concentration distribution Movement characteristics Longwan

Estimation of the impact of biomass burning based on regional transport of PM_(2.5) in the Colombian Caribbean

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Geoscience Frontiers 2022年第1期13卷 430-436页

作者： Jehison Bolaño-Truyol Ismael L.Schneider Heidis Cano Cuadro Jorge D.Bolaño-Truyol Marcos L.S.Oliveira Department of Civil and Environmental Universidad de la CostaCUCCalle 58#55–66BarranquillaAtlánticoColombia Department of Productivity and Innovation Universidad de la CostaCUCCalle 58#55–66BarranquillaAtlánticoColombia Faculdade Meridional IMED 304 Passo FundoRS 99070–220Brazil Universidad de Lima Avenida Javier Prado Este 4600Santiago de Surco 1503Peru

Deterioration of air quality due to the increase in atmospheric emissions from biomass burning(BB)is one of the major environmental problems *** this study,we estimated the contributions of BB to PM_(2.5) concentrations in the municipalities of Soledad and Malambo located in the Colombian *** evaluation period ranged from February 24 to March 30,2018,a period with a high number of BB events recorded in the surroundings of the evaluated *** contribution of BB to the two sampling sites was estimated using the Hybrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT)dispersion model with forwarding trajectories from each of the burning points identified by satellite images(n=1089).The PM_(2.5) emissions were determined using the fire radiative power(FRP),obtained by remote-sensing data,and corresponded to the radiant energy released per time unit by burning *** average PM_(2.5) concentrations during the evaluation period were 19.91μg/m^(3) for Soledad and 22.44μg/m^(3) for *** average contribution of BB to these municipalities was 22.8%and 28.8%,*** methodology used in this study allowed to estimate the contribution of this important source without knowledge of a previous tracer of BB,thereby increasing the use of the proposed procedure *** information would enable the implementation of effective mitigation,thereby diminishing the adverse impact of PM_(2.5) on the health of the population.

关键词： Biomass burning Particulate matter HYSPLIT dispersion model Remote sensing

Resting Study of Tracer Experiment on Catalytic Wet Oxidation Reactor under Micro-gravity and Earth Gravity Conditions

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Chemical Research in Chinese Universities 2005年第6期21卷 702-706页

作者： YANG Ji JIA Jin-ping School of Environmental Science and Engineering Shanghai Jiaotong University Shanghai 200240 P. R. China

The International Space Station（ISS） employs catalytic wet oxidation carried out in a Volatile Reactor Assembly （VRA） for water recycling. Previous earth gravity experiments show that the VRA is very effective at removing polar, low molecular weight organics. To compare the reactor performance under micro-gravity and Earth gravity conditions, a tracer study was performed on a space shuttle in 1999 by using 0.2% potassium carbonate as the chemical tracer. In this paper, the experimental data were analyzed and it is indicated that the reactor can be considered as a plug flow one under both micro-gravity and earth gravity experimental conditions. It has also been proved that dispersion is not important in the VRA reactor under the experimental conditions. Tracer retardation was observed in the experiments and it is most likely caused by catalyst adsorption. It is concluded that the following reasons may also have influence on the retardation of mean residence time ：（1） the liquid can be held by appurtenances, which will retard the mean residence time; （2） the pores can hold the tracer, which can also retard the mean residence time.

关键词： Tracer study Micro-gravity dispersion model Tank in series model Catalytic wet oxidation

Assessing the impact of air pollution sources in Hong Kong, a densely populated city

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Journal of Environmental Sciences 1993年第1期5卷 1-15页

作者： Feng Yingsheng (Y. S. Fung) Department of Chemistry, Hong Kong University, Hong Kong Dept. of Chemistry Hong Kong Univ. Hong Kong.

As the simple dispersion model tested is not sufficiently accurate to predict the SO2 concentration in complex terrain commonly encountered amongst high rise buildings in Hong Kong, and the lack of comprehensive local wind data at most sites prevents the use of more advanced dispersion model to assess the impact of major air pollutant sources, a receptor model approach is adopted for the apportionment of air pollution sources in Hong Kong. The preliminary results obtained are presented and discussed.

关键词： enviromental impact assessment dispersion model receptor model.

Air quality short-term control in an industrial region under adverse weather conditions

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Control Theory and Technology 2020年第3期18卷 257-268页

作者： Yuri SKIBA David PARRA-CUEVARA Center for Atmospheric Sciences National Autonomous University of MexicoCircuito ExteriorCiudad UniversitariaCDMX04510Mexico

A new short-term optimal control of air quality in an industrial region during atmospheric inversions is *** goal is to prevent violation of health standard of air quality in a few monitored *** control establishes restrictions on the emission rates of industrial sources and includes the identification of the industrial sources violating(exceeding)the emission rates set by the *** control and identification are based on using solutions to an adjoint dispersion *** that show the convergence of the emission rates,prescribed by the control,to the original emission rates of the industrial sources are given(Theorems 4 and 5).These results ensure that the new emission rates of industrial sources(established by the control)will be as close as possible to the original emission rates throughout the entire period of application of the *** creates the minimum possible restrictions on the functioning of industrial *** highlight of the new control is the possibility of selecting special weights for each pollution source in the goal function that is *** weights are mainly aimed at reducing the intensity of emissions of the main sources of *** example demonstrates the ability of the new method.A similar approach can also be used to develop methods for cleaning water zones polluted by oil(the problem of bioremediation),and to prevent excessive pollution of urban areas with automobile emissions.

关键词： dispersion model adjoint model adjoint estimates optimal control source detection

A Method for Constructing Mathematical modeling of the Spread of a New Crown Pneumonia Epidemic Based on the Effect of Temperature

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Journal of Applied Mathematics and Physics 2023年第11期11卷 3625-3640页

作者： Zhening Bao Sino-Canada School Suzhou China

To better predict the spread of the COVID-19 outbreak, mathematical modeling and analysis of the spread of the COVID-19 outbreak is proposed based on data analysis and infectious disease theory. Firstly, the mathematical model indicators of the spread of the new coronavirus pneumonia epidemic are determined by combining the theory of infectious diseases, the basic assumptions of the spread model of the new coronavirus pneumonia epidemic are given based on the theory of data analysis model, the spread rate of the new coronavirus pneumonia epidemic is calculated by combining the results of the assumptions, and the spread rate of the epidemic is inverted to push back into the assumptions to complete the construction of the mathematical modeling of the diffusion. Relevant data at different times were collected and imported into the model to obtain the spread data of the new coronavirus pneumonia epidemic, and the results were analyzed and reflected. The model considers the disease spread rate as the dependent variable of temperature, and analyzes and verifies the spread of outbreaks over time under real temperature changes. Comparison with real results shows that the model developed in this paper is more in line with the real disease spreading situation under specific circumstances. It is hoped that the accurate prediction of the epidemic spread can provide relevant help for the effective containment of the epidemic spread.

关键词： Pneumococcal Pneumonia Outbreak dispersion model Mathematical modeling Prediction