Advanced Materials Research Vols. 986-987

Abstract: Based on theoretical deduction, according to the characteristics of nuclear power unit, a universal heat economic framework for PWR nuclear power plant heat regenerative system was established. And on this basis, the cycle thermal efficiency was chosen as the optimization goal, the extraction steam pressures were chosen as optimization variables, a universal nuclear power unit regenerative system optimization model was established. A 900 MW nuclear power unit was taken for example, it’s the first time that AWPSO was applied to optimize the regenerative heat system of nuclear power unit. The result shows that the convergence ability and search performance of PSO are superior to other methods and the original design scheme. A new and convenient design is provided for PWR nuclear power plant heat regenerative system in this paper.

Abstract: The distributed parameters of transformer windings are indispensable in analyzing the transients particularly caused by the very fast transients which occur at the time of disconnecting switch operations in GIS. Winding insulation structure and the safe and stable operation of the transformer are determined by the accuracy of the calculation. In this paper, finite element method (FEM) is used to model and simulate the electromagnetic field calculation of winding capacitance and inductance parameters. The simulation calculation results are consistent with the experimental measurements on a transformer model, which verifies this method is feasible.

Abstract: In order to discuss the treatment performance of wastewater from desulphurization precipitator by settling technique of compound flow, the field test rendered the effluents of integrated desulfurization precipitator as the handing objects. The results show that the critical load of the sediment separator is 4mm/s. When the surface load is less than or equal to 4 mm / s, the turbidity of effluent is less then 10 degrees and the maximum is less then 18.2 degrees. The effect of hydraulic load impact on the water treatment system is greater than that of pH and SS of inlet. The treatment efficiency of field test is equivalent that of laboratory simulation.

Abstract: As acid rain getting more and more serious, increasing attention is given to environmental effect assessment of uranium tailings under the condition of acid rain. In the paper, influence of acid rain to partitioning coefficient (Kd) of U(VI) in soil was studied, and migration of radionuclide uranium in soil was simulated by computer. The static experiment results showed that the Kd value of U(VI) in soil reaches minimum value when pH is 2.0. When 2.0<pH<3.5, the Kd showed a rising tendency;The Kd in soil reaches maximum value when pH is 3.5. And when 3.5<pH<8.0, the Kd showed a decreasing tendency. This paper has taken a large uranium tailings impoundment in South China as an example studied by VisualModflow. After setting up models of groundwater movement and radionuclide migration in the study area, migration tendency of radionuclide U(VI) was simulated and pollution of radionuclide to environment was predicted. The results of simulation show that the migration of uranium speed to be the slowest when pH = 2.0, and the figure to be the fastest when pH = 3.5. Furthermore, maximum speed is about 1.24 times of minimum speed.

Abstract: In the past forty years, the investigation on Hot Dry Rock (HDR) geothermal resource has been a hot topic. A great number of investigations confirm that electricity power generated from HDR is feasible and propose that a right HDR site is composed of basement rock and its overlying cover. In the present study, we explore the petrology, geochronology and geochemistry features of the HDR basement rocks with the aim to further optimize HDR siting conditions. Combined analyses show that young S-type or crustally-derived granites with high U, Th and K contents have great potential to develop HDR geothermal resources.

Abstract: Using a large number of core, logging and seismic data, on the basis of sequence stratigraphy, reservoir geology, sedimentology, such as theory, the San Zhao peripheral zone were studied. FuYu reservoir is studied and Yang DaChengZi reservoir structure of reservoir. Based on coring well cores observation and rock thin section, casting thin sections and scanning electron microscopy (sem) analysis techniques, such as the SQ3–Y1 a sedimentary period main sedimentary, main lithological types, and different oil reservoir is studied.

Abstract: Jurassic coalfield in northern Shaanxi is a typical ecologically fragile area. In recent years, with the rapid development of coal mining industry in this area, the environmental problems were caused by coal mining have become so serious that threat seriously to the sustainable development of northern Shaanxi. In this paper, the research team use multi-round expert seminar to design a coal’s green mining technology roadmap (CGM-TRM) for Jurassic coalfield of northern Shaanxi, which will provide a macro guidance for related government, institutions and enterprises, and produce wide range of utility in relevant R&D activity.

Abstract: With the development of modern coal mining equipment, high-yield, high efficiency, high-speed mining technology was achieved, but also a sharp increase in the amount of dust generated in the mine at the same time, it damage workers health and bring insecurity to mine production. This paper has summarized the existing domestic and international prevention and control technology of dusts, elaborated mineral dust prevention and control work from the dust control, dust generation and dust diffusion three major aspects, and noted that the current technology trends.

Abstract: In our country there is plenty of CBM (coalbed methane), but the state of CBM itself, unique output mechanism and low saturation, low permeability, low reservoir pressure and high gas content, et al. determine the low efficiency of it, so in order to improve CBM recovery, combined with the successful experience of north American shale gas reservoir by SRV(stimulated reservoir volume), the writer summarizes the implementation of SRV, deeply analyzes effectiveness and limitations of this new technology in CBM development. The results of practical research and theoretical analysis show that SRV in the coal reservoir can achieve the desired effect on the condition that there are great quantity of natural fractures, joints and bedding, weak structure surface development in the reservoir, the rock brittleness index is greater than 40 and horizontal principal stress difference is relatively smaller. Finally, simulating a well’s condition by the MEYER software, the result shows that SRV is feasible in coal reservoir, which will create important guiding significance and practical value for the exploration of CBM.

Abstract: Elevated water temperatures are the major threats from thermal discharges of coastal power plants. The effects of thermal discharge from power plant on phytoplankton were reviewed. With increasing amount of nuclear power plants in China, The effects of thermal discharge from a nuclear power plant on phytoplankton were investigated. Several results and suggestions were proposed.