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Xiangcheng Wu,Changqi Yan,Zhaoming Meng,Kailun Chen,Shaochuang Song,Zonghao Yang,Jie Yu 한국원자력학회 2016 Nuclear Engineering and Technology Vol.48 No.6
To get an insight into the operating characteristics of the passive residual heat removalsystem of molten salt reactors, a two-phase natural circulation test facility was constructed. The system consists of a boiling loop absorbing the heat from the drain tank, acondensing loop consuming the heat, and a steam drum. A steady-state experiment wascarried out, in which the thimble temperature ranged from 450℃ to 700℃ and the systempressure was controlled at levels below 150 kPa. When reaching a steady state, the systemwas operated under saturated conditions. Some important parameters, including heatpower, system resistance, and water level in the steam drum and water tank wereinvestigated. The experimental results showed that the natural circulation system isfeasible in removing the decay heat, even though some fluctuations may occur in theoperation. The uneven temperature distribution in the water tank may be inevitablebecause convection occurs on the outside of the condensing tube besides boiling withdecreasing the decay power. The instabilities in the natural circulation loop are sensitive toheat flux and system resistance rather than the water level in the steam drum and watertank. RELAP5 code shows reasonable results compared with experimental data.
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Jiang Wei,Wu Zonghao,Zhang Mengqi,Zhang Haoguang 한국산업안전보건공단 산업안전보건연구원 2024 Safety and health at work Vol.15 No.1
Background Dust generated during the processing of building materials enterprises can pose a serious health risk. The study aimed to compare and analyze the results of ART and the Monte Carlo model for the dust exposure assessment in building materials enterprises, to derive the application scope of the two models. Methods First, ART and the Monte Carlo model were used to assess the exposure to dust in each of the 15 building materials enterprises. Then, a comparative analysis of the exposure assessment results was conducted. Finally, the model factors were analyzed using correlation analysis and the scope of application of the models was determined. Results The results show that ART is mainly influenced by four factors, namely, localized controls, segregation, dispersion, surface contamination, and fugitive emissions, and applies to scenarios where the workplace information of the building materials enterprises is specific and the average dust concentration is greater than or equal to 1.5 mg/m3. The Monte Carlo model is mainly influenced by the dust concentration in the workplace of building materials enterprises and is suitable for scenarios where the dust concentration in the workplace of the building materials enterprises is relatively uniform and the average dust concentration is less than or equal to 6mg/m3. Conclusion ART is most accurate when workplace information is specific and average dust concentration is > 1.5 mg/m3; whereas, The Monte Carlo model is the best when dust concentration is homogeneous and average dust concentration is < 6 mg/m3. Background Dust generated during the processing of building materials enterprises can pose a serious health risk. The study aimed to compare and analyze the results of ART and the Monte Carlo model for the dust exposure assessment in building materials enterprises, to derive the application scope of the two models. Methods First, ART and the Monte Carlo model were used to assess the exposure to dust in each of the 15 building materials enterprises. Then, a comparative analysis of the exposure assessment results was conducted. Finally, the model factors were analyzed using correlation analysis and the scope of application of the models was determined. Results The results show that ART is mainly influenced by four factors, namely, localized controls, segregation, dispersion, surface contamination, and fugitive emissions, and applies to scenarios where the workplace information of the building materials enterprises is specific and the average dust concentration is greater than or equal to 1.5 mg/m3. The Monte Carlo model is mainly influenced by the dust concentration in the workplace of building materials enterprises and is suitable for scenarios where the dust concentration in the workplace of the building materials enterprises is relatively uniform and the average dust concentration is less than or equal to 6mg/m3. Conclusion ART is most accurate when workplace information is specific and average dust concentration is > 1.5 mg/m3; whereas, The Monte Carlo model is the best when dust concentration is homogeneous and average dust concentration is < 6 mg/m3.
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Zhaobiao Yang,Congcong Wu,Yong Qin,Geng Li,Zonghao Qin 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.4
The geochemical information of produced water from coalbed methane (CBM) wells is abundant in geological significance. Based on the conventional ions, hydrogen and oxygen isotopes (δD and δ18O) and trace element tests of 27 produced water samples from CBM wells, the geochemical identification of the source and environment of produced water from CBM wells and its productivity significance have been analysed. The following conclusions have been drawn: CBM produced water can be divided into three categories, namely, polluted water from frac fluids, polluted surface water and formation water. The formation water has low Cl– concentration, low total dissolved solids (TDS) concentration, and light δD and δ18O. The water polluted by frac fluid has high Cl– and TDS concentrationt, and heavy δD and δ18O. The polluted surface water has high SO42– and light δD and δ18O. CBM groundwater environments can be divided into confined and unconfined systems. The confined system is characterized by low Na+/Cl– value, high (Cl– – Na+)/Mg2+ value, a general absence of SO42–, high Sr and Ba and low F. The unconfined system is characterized by high Na+/Cl– value, low (Cl– – Na+)/Mg2+ value, low SO4 2–, low Sr and Ba and high F. Constructing a cross plot with the new D drift index (d’) value and Cl– concentration can further identify four types of source-water environments: an unconfined formation water system, an unconfined surface water system, a confined system heavily polluted by frac fluids, and a confined system only slightly polluted by frac fluids. The unconfined system often produces more formation water and has high CBM production. The confined system often produces water more heavily polluted by frac fluids and is low in CBM production. The fitting formulas of hydrochemical productivity have been established for daily CBM and water production of CBM wells.
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