Email alert
RSS2017 Vol. 4, No. 2
Display Method:
2017, 4(2): 1-16.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.001
Abstract:
The Hongkong Zhuhai Macao Bridge (HZMB) Project, 55 km long, links Hongkong, Macao and the Mainland China Zhuhai city. It is a combination engineering of bridges, islands and tunnel in which the two offshore artificial islands are used as transition between bridges and tunnel. With a length of approximately 6.7 km, the immersed tunnel becomes the world′s longest highway concrete immersed tunnel. It is the controlling work of the whole link. To accommodate the passing of 3 million tons vessels, the maximum tunnel depth is 45 m below sea level, being one of the deepest in the world. When also taking into account the varying and relative poor soil conditions, the large tunnel spans, the offshore conditions for construction and the complex connection of two artificial islands which are reclaimed in poor soil conditions, the HZMB Link can be considered as one of the most challenging projects worldwide. From project consultant point of view, the paper introduces the general information of HZMB project but with details on the technical difficulties of the immersed tunnel, which includes: Tunnel structural design, tunnel foundation design, tunnel element production, transport and immersion, closure joint, durability, etc. Finally, the opinion on the main innovations of the immersed tunnel will be introduced. It will be right the time of "through-going" of whole tunnel construction when the paper is to be published, which also means the "through-going" of the whole link construction. As one of the involved companies, this paper expresses also our congratulation to this great milestone of the project.
2017, 4(2): 17-23.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.002
Abstract:
For the dilemma of modeling & optimizing of DES/CCHP due to the absents of variable-interrelation among sub-systems, a logic modeling/optimizing energy flux chart of DES/CCHP is advanced, which including 9 sub-systems, that are power-system, DCS, DWS, hot water, renewable generating, SMG, gas/LNG, hydrogen, and industrial waste heat.It was pointed out that the topology structure & parameters inside a sub-systems are may be described and optimized, but not existed among different sub-systems.Therefore, a Decomposing/Coordinating strategy has been adapted and electricity is the main coordinating variable.Two main strategies are advanced: (1)Modeling & optimization was realized via optimizing and iterating among multi-operation-subsystem modeling with design modeling; (2)The direct targets of optimization was the economic benefit, high energy-efficiency target comes from sub-system decision according to the principle of "Use energy scientifically" , while low carbon target depends upon energy efficiency and choosing of primal energy.Above method has been applied in design & construction of many natural gas DES/CCHP projects.Thus, it has important scientific meaning and practical prospect.
2017, 4(2): 24-28.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.003
Abstract:
The integrated energy system (IES) is an important developing direction for future energy use. The tradeoff between energy system setting and economic and environmental benefit is a paramount design consideration for multi-energy complementary system. In this paper, a general model was established based on three levels consisting of function unit, subsystem, and local area IES. Then, the energy balance calculation of subsystem and IES was performed after rational allocation of function unit. Furthermore, the model provided the optimal IES setting scheme satisfying energy consumption, economic, or environment protection single evaluating indicator or the multi-complementary evaluating indicator requirements.
2017, 4(2): 29-33.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.004
Abstract:
To improve the design and the construction management of the pumped-storage power stations in China, the article overall summarizes the experience and lessons of the Guangzhou Pumped-storage Power Station for 20 years from the aspects of reservoir capacity, underground anti-vibration, leakage, drainage, water drainage and filling in the high pressure tunnel and safety monitoring system. The results shown that the design and operation of the hydraulic structures in GPSPS are basically reasonable, but there are still some places worthy of improvement.
2017, 4(2): 38-45.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.006
Abstract:
With the electric power system reform promoting and new energy micro-grid promotion efforts increasing in our country, zone type micro-grid planning and construction has been paid more and more attention .on the basis of zone type micro-grid feature analysis, this paper analyses and studies on the key issues in course of zone type micro-grid planning, which includes distributed generations and storage configure, primary system network scheme, micro-grid protection configuration, secondary monitoring system construction and so on, and the feasible solution schemes are put forward.
2017, 4(2): 46-50,57.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.007
Abstract:
In order to overcome the limitation of single power load forecasting model and improve the predicted results, an annual peak load forecasting method based on combination model of back propagation neural network and grey regression is proposed. Levenberg-Marquardt algorithm is used to optimize the parameter iterative process in back propagation neural network forecasting model; original sequence is reformed by using policy factor treatment method in the grey forecasting model, which can strengthen increasing trend of the sequence; stepwise linear regression method is used to eliminate the independent variables that have a small effect on the dependent variable in the regression forecasting model. The three forecasting models are finally weighted combined by using variance-covariance method. The combined forecasting model is tested with the actual data of Guangzhou from 2007 to 2016, the peak load of Guangzhou from 2017 to 2019 is forecasted as well. The results show that the prediction accuracy of the method proposed in this paper is relatively high and the errors are within the permissible range in engineering, indicating the method is valuable in engineering.
2017, 4(2): 51-57.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.008
Abstract:
The time-variation of electric load has a great influence on the real-time dynamic simulation of power systems. In order to improve the accuracy of real-time dynamic simulation and analysis, an on-line dynamic electric load modeling method based on unscented kalman particle filter is proposed in this paper. That is, the unscented kalman particle filter is used to estimate the parameters of an exponential dynamic load model structure online. In this way, the parameters of the dynamic lad model can be adjusted online according to the measured data, and the real-time load characteristics are tracked effectively. The measurements from the digital simulation platform and the actual power systems are used to test the effectiveness of the proposed method, respectively. The results provided by the proposed online parameter identification method is accurate, the real-time change load characteristics of the actual power system also can be described precisely.
2017, 4(2): 58-63.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.009
Abstract:
With the development of advanced measurement technology in China, it has been paid more and more attention to the analysis of electricity and gas energy consumption, intelligent family and intelligent community. Combined with the actual situation of advanced measurement technology research, to carry out intelligent interactive energy metering technology research and equipment development, and intelligent family and intelligent community, measurement automation advanced communications technology demonstration applications. Through technical research and demonstration application project, to enhance the advanced measurement technology and equipment level, to explore advanced applications and related derivative business under markert conditions, to achieve business and operational model transformation, the formation of value-added service system.
2017, 4(2): 64-68.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.010
Abstract:
Proton therapy is currently one of the advanced tumor radiation therapy, but using proton therapy facility will produce radiation. In order to ensure its safe operation, environment and personnel by ionizing radiation meet the relevant national standards requirements, the proton therapy facility of radiation protection need to be considered. In this article, analysis of mechanism of proton therapy and shielding principle, the article puts forward the design method of radiation protection, which determine the radiation protection design goals, assess the source term, considering the convenience and safety of equipment use, engineering cost and other factors, shielding materials and parameters, the shielding calculation, set the safety interlock system and radiation monitoring system, and ensure that medical staff occupational exposure, satisfies the requirement of safety dose by public exposure of the masses.
2017, 4(2): 69-72.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.011
Abstract:
Electric vehicle energy supply has two kinds of typical model—battery charging and battery replacement, the choice is closely related to battery size, energy density, manufacturing cost, battery management system and charging infrastructure .This paper describes the development level of the lithium iron phosphate and ternary material lithium ion battery which are most widely used in electric vehicles at home and abroad. At the same time, we analyze the requirements on electric vehicle batteries and charging infrastructure for the two modes, then draw the conclusion that which condition is suitable for battery charging or battery replacement.
2017, 4(2): 73-76.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.012
Abstract:
Aiming at the difficulties and requirements of superheated steam temperature control in thermal power units, conventional cascade control system can not achieve good control effects, dynamic error of steam temperature is difficult to be controlled within the required range especially in the wide range of load change. Analyzed the theory of double loop steam temperature control system base on mechanism model and its configuration method of control parameter and optimized the control scheme. Applied to the superheated steam temperature control of 300 MW CFB unit, the results shown that the steady state performance and the dynamic performance are of good quality, and it can adapt to the wide range of load change. The control scheme can flexibly configure the time constant of the inertia transfer function in the steam temperature control and adjust the gain of the controller parameters, thus it has a good promotion in engineering applications.
2017, 4(2): 77-80.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.013
Abstract:
Some PV station adopting the design philosophy that the PV module's and inverter's capacity ratio higher than 1 in recent years, the definition of ratio is based on the designer's personal experience, lack of theory analysis. In this paper, based on the measured irradiance data in a certain place, analysis the ratio between the added generation of PV station and investments based on different efficiency and price of PV station by using value engineering method. At last, we give the optimized PV module's and inverter's capacity ratio in the certain palace for the similarly projects.
2017, 4(2): 81-85.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.014
Abstract:
Different types of precast tunnel and their characteristics are collected, and the related discussion is made in this thesis. Through the collection of engineering examples and manufacture information, we give the related introduction about the main types of precast tunnel: assembled precast municipal tunnel and composite precast tunnel. Meanwhile, waterproof, transport and hoisting are especially focused on as the main problems. The relevant data show that although the cast-in-place structure still account for the vast majority of the existing engineering, precast tunnel with its own unique advantages and potential has a wide prospect in engineering application
2017, 4(2): 86-89,94.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.015
Abstract:
Shield cable tunnel settlement subsidence regulations are analysed based on measured data. The reasons for differences of measured data and experience data are analysed after comparing the measured data with experience formulas, the correction methods of settlement prediction are provided. First, the subsidence and the law of its development caused by shield construction are analysed. Secondly, the experience formulas for subsidence prediction are given, the reasons for differences of measured data and experience data are obtained according to the characteristics of the actual project. Finally, the correction methods of settlement prediction are obtained. The results show that the shield construction status and the settlement prediction parameters could be obtained through analysing measured data, which could provide technical guidance to the shield construction, they could also provide references to the similar construction.
2017, 4(2): 90-94.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.016
Abstract:
The K type connecting plate is used for connecting main member and brace member of steel tubular tower. The centroid of members shall intersect at one point as much as possible. The weight of joint and wind area of tower were increased for the large connecting plate due to small included angle between main member and brace member. The size of the connecting plate will be reduced when using the eccentric joint. The entire finite element model with eccentric joint was employed to study mechanical behavior of main member and brace member. The results shown that mechanical behavior of main member and brace member were less affected by eccentric joint. The recommended design method of steel tubular tower with eccentric joint was proposed and the results can be used as a reference for engineering application and theoretical study.
2017, 4(2): 95-101.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.017
Abstract:
The river sediment with heavy metal pollution has been the prime focus all over the world. In this investigation we cited the Beiganghe River demonstration pilot project with the sediment polluted by heavy metal in a case, introduced the environmental investigation, sediment pollution risk assessment, technology selection of sediment restoration, river surverying, embank ecological design, and disposal engineering technology which are completed in cooperation by the surverying engineering company and environmental scientific research. This work provides some guidance for similar riverway treatment.
2017, 4(2): 102-105,101.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.018
Abstract:
Urban black-odor water body remediation projects generally surrounding density people. The construction will inevitably affect the surrounding environment. Taking Shenzhen Huaguping River remediation project as an example, this paper analyze the environmental impact of the project according to the environmental factors, and put forward corresponding environmental protection measures to minimize the impact of the project on the environment. It can be also used as reference for similar projects.
2017, 4(2): 106-109.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.019
Abstract:
The present situation of rural sewage collection and treatment in Guangdong province is described. The inherent various difficulties of collection and treatment of rural sewage and some problems peculiar to the rural areas in Guangdong province are analyzed. And put forward the corresponding solution. Balance the the relationship between the three of sewage collection rate, separation of rain and sewage, construction costs, which is the key to the construction of the project. Miniaturized and integrated processing equipment has been applied. It is also necessary to integrate pre-treated structures and other structures into an integral equipment for construction and installation. The core treatment process should be chosen according to the actual situation of the village.
2017, 4(2): 110-114.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.020
Abstract:
The groundwater pollution resulting from landfill leakage in urban areas has become an increasingly serious threat. At present, there are various problems in the method of monitoring the landfill leakage. The environmental geophysics methods are the main approaches for leakage monitoring. However, similarly to other landfill leakage monitoring methods, these traditional geophysical methods have the problems of limited surveying range and a long period of survey intervals. This paper introduces the elemental mechanism of landfill leakage pollution, whilst also reviewing the principles of applying resistivity method to monitor leakages. The resistivity Full Channel Method is introduced with apparent advantages; these are illustrated using a synthetic model to compare the Full Channel Method against other traditional methods. This paper also discusses the advantages of using permanent buried electrodes for data acquisition, and processing, while introducing the main methodologies and principles of the data interpretation on the resistivity anomaly. With the extensively large scale of the landfill industry, the data acquisition and processing with resistivity Full Channel Method can provide real-time, high-efficiency, and comprehensive monitoring, which deserves to be applied within all landfill sites.
2017, 4(2): 115-119.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.021
Abstract:
The present development situation and future trends of electrical network inspection by unmanned aerial vehicle has been described in this paper. Analysis and prospect of electrical network inspection by unmanned aerial vehicle was made from channel inspection, tree obstacle inspection, fine inspection, management and application of inspection data and foreign body removal according to the existing technology research and practical application. The technology has entered a rapid growth stage from the exploration stage. Electrical network inspection by unmanned aerial vehicle enjoys promising application prospects.
2017, 4(2): 120-125.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.022
Abstract:
This paper introduces several methods of aerial transmission line model construction: based on two-dimensional drawing modeling, based on laser scanning modeling, based on aerial modeling. And the results show that the efficiency of the design drawing method and the fineness of the model are high, but the data volume is large, which is not conducive to the management of the system. It is suitable for the new route. The efficiency of the construction drawing method Low precision, data is difficult to obtain, the accuracy can not be guaranteed, suitable for early construction and complete data lines; based on laser radar modeling accuracy and model of high precision, but the work of large strength, high cost, suitable for small area, High-level plain lines and substations; aerial modeling method can be used to make existing channel corridor channel and line ontology three-dimensional model data, high efficiency and accuracy, to meet the needs of operation and maintenance management, but also as a line clearance analysis And other deep application of the first-hand analysis of data, it is worth promoting the application.
2017, 4(2): 126-131.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.023
Abstract:
Aiming at the characteristics of high cost of DP vessel in the detection process of submarine cable and the limitation of anchoring location of common ship, a non-dynamic positioning platform for underwater robot is proposed. According to the actual demand, and the principle of dynamic positioning, the selection of non-dynamic positioning platform and operation process of underwater robot are discussed, besides, the feasibility of adaptive matching between catamaran as a non-dynamic positioning platform and underwater robot, is also demonstrated. That could provide the basis for the feasibility of construction and operation and maintenance of marine subsequent detection, and also provides the reference for the design and development of non-dynamic positioning platform.
2017, 4(2): 132-136.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.024
Abstract:
Type K thermocouples applied in the In-core exit temperature measurement for nuclear power plants are important class 1E equipment, which have always been dependent on imports in China. With the consideration of meanings of important equipment’s localization for "Chinese nuclear go global" strategy, in-core temperature measurement type K thermocouples were researched and developed by related Chinese stakeholders, and were applied in CHASHMA Nuclear Power Plants Unit 3/4, which are the third and fourth nuclear power plants built by China in Pakistan. Based on a thorough study over operation environment and installation requirements, an innovative design were applied on the thermocouple structure, which were all-sheathed, segmented and with new type thermocouple connectors, the influence of material choose on the characteristics of thermocouples and nuclear safety were carefully analyzed, the traditional thermocouples fabrication procedures were optimized and improved, eventually the samples passed the type test and 1E qualification test, and the products were successfully installed and commissioned in CHASHMA Nuclear Power Plants Unit 3/4, therefore the localization of type K thermocouples of in-core temperature measurement for nuclear power plant reactor reached a periodical success.
2017, 4(2): 137-140.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.025
Abstract:
On account of valve end-loading test belonging to nuclear equipment qualification test, solenoid globe valve applied as RPV head exhaust valve for advanced PWR was taken as an example, method of valve end-loading test and loading calculation were discussed based on ASME QME-1. Test devices, procedure and results of solenoid globe valve end-loading test were introduced, the measured strain curves and functional test after end-loading test proved that the valve specimen was qualified for the end-loading test. The systematic introduction of method and technical essentials of valve end-loading test can be a significant reference for equipment qualification in the industry.
2017, 4(2): 141-146.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.026
Abstract:
The combined method for vacuum preloading and pneumatic fracturing is a new soft earth foundation treatment. It formed a series cracks when the high pressure gas entered into soils, then the penetrating quality increased, the settlement rate was accelerated and construction times have been cut down, thus the goal of economic efficiently reinforcement of deep soft foundation been achieved. Based on the purpose of settlement deformation controlling, the design principles, design contents, parameter choice and design calculation method was put forward, by the combined method of vacuum preloading and pneumatic fracturing for soft ground improvement. After that, the method was applied to the deep soft soil improvement of Funing-Jianhu Highway, some indexes was monitored such as ground surface settlement, horizontal displacement of deep soft soil, and CPTU static point resistance and good effect was obtained. The design method can be reference basis to engineering application.
2017, 4(2): 147-152.
doi: 10.16516/j.gedi.issn2095-8676.2017.02.027
Abstract:
The current domestic electric power design institutes enterprise in an important business transformation, and there are more and more EPC projects. Due to the large amount of contracts, professional, long cycle, involving many internal and external stakeholders of the Large power EPC projects, a variety of risk factors lead to schedule goals often unable to be completed on schedule. Based on the project of 2×1 000 MW new construction design and construction contract of Jiangxi Datang International Fuzhou Power Generation Co., Ltd., this paper also analyzes the risk of impacting on the progress of other major EPC projects and analyzes the key risk sources Puting forward some suggestions on the risk control mode.
