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The paper is drawn from a 2-year study of black liquor concentration conditions by ultrafiltration ceramic membrane technology, and obtaining excellent fuel for coal burning boiler of electric power plant. The experiment implies that solids in black liquor can be concentrated up to 4-6 times then before under conditions of adding flocculants concentration is 4.0-4.5mg/L and filtration pressure is...
Though the combination energy-saving measure for mechanical oil production well plays a very important role in improving the whole economic efficiency of the oil field, it does not reach to the optimal saving status. Except for the increasing inputs of saving measure, optimizing of the combination of kinds of saving equipment and technology is needed for enhancing the economic efficiency of the combination...
Steam pipelines play an important role in industrial enterprises. They joint the heat producer and users, and constitute the energy transmission networks. The total cost on steam pipelines include the expense of steel and heat insulator, converted expense of heat loss, and construction cost. This study develops a mathematical model of total cost on steam pipelines with golden section algorithm. The...
Based on the analysis and comparison of traditional slope treatment methods on steep rocky slopes, the construction technology, properties and advantages of Vegetation-Growing Concrete Base Material Slope-Protected Technique were recommended. It was demonstrated that this technology has good benefits and application prospects for soil and water conservation, economy and ecological construction, sustainable...
A novel circuit breaker closing resistance instrument is designed in this paper. Super capacitor was used as test power source, and a digit signal processor as microcontroller, moreover AD526 and LM324 were used for signal amplifying and filtering. On-chip Analog-Digital converter was used to acquire voltage data. Closing resistance, loop resistance, and pre-insertion time can be measured in one closure...
This paper presents a dual-buck full-bridge inverter (DBFBI) with different inductor structures. All power devices operate at each half line cycle, and the freewheeling current flows through the independent diodes instead of the body diodes of the switches. Shoot-through problem does not exist. However, the DBFBI has four inductors, so the weight and volume of the inverter may be large. In order to...
From the angle of the traditional energy assessment, the fuzzy probability theory is applied to appraise the green energy. Firstly, the influential factors of the green energy assessment for energy project are analyzed according to China's national conditions. The factors of energy project are divided into four parts, such as absolute cost, ecological harmony, energy security and sustainability. The...
Based on the two-fluid flow model combining by incorporating particle rotation with the kinetic theory of granular flow, Numerical analyses of effect of particle rotation on gas and particles flow behavior in a circulating fluidized bed(CFB) were performed. Results were compared between simulations without and with particle rotation. It was found that the particle concentrations were slight decreased...
Used Tween-80 as emulsifler, industrial lipase as catalyst to hydrolyze waste oil from restaurants and make mixed fatty acid. We discussed the enzyme concentration, substrate concentration, temperature and time on hydrolysis. Through the experiment, we found that when we used emulsifier which contains 2% oil in the system, we could get the optimal parameter for hydrolysis of waste oil from restaurants...
Depend on the preliminary experiments, salt addition was carried out to enhance the stability of emulsions which produced via bio-oil and diesel emulsification. The presented work was focused on the effect of NaCl, a representative of salt, addition on the stability, surface tension and kinetic viscosity of emulsions. It was found that with the addition of NaCl, the emulsion stability was improved...
Three working fluids R125, R143a and R32 were analyzed thermodynamically for the transcritical heat pump with low temperature geothermal source as its heat source. The system parameters investigated include coefficient of performance (COP), volumetric heat capacity (Qv), compressor discharge temperature and the pressure ratio. The results show that Qv, pressure ratio and compressor discharge temperature...
Taking the unified power flow controller as an example, this paper states the applying foreground of flexibility AC transmission system technology in distribution systems, which comprise wind power generators. As for the impacts of the wind power on the power systems, this paper indicates the deficits of the unified power flow controller, proposes the idea that integrating the energy storage system...
Accurate estimation of power battery SOC (state of charge) is the basis of HE V power control strategy. SOC estimation algorithm has a significant impact on the accuracy of SOC estimation. This paper described the basic concept of SOC, discussed the significance of SOC estimation algorithm, difficulties and the main factors affecting SOC estimation, proposed a hybrid battery SOC estimation method...
Computer network is playing an active role in modern business management in power system. Nowadays, information power industry develops rapidely, highlighting the growing importance of information security, and the challenges are increasingly serious. This paper analyzes security risks in power enterprise network and proposes specific corresponding strategies.
The results presented that the faults in this area composed by three groups which head for EW, NE and NW etc. The patterns of the half-graben assemblage were divided into two styles which the former patterns are half-grabens formed by trailing faults, step faults and en echelon faults generated by a series of synthetic faults; and the later patterns are some kinds of grabens and horsts generated by...
Line losses analysis and management of distribution networks is an important task for the system operation and planning. The conventional line losses calculation software needs enormous data input by means of hands and easily result in errors. Now it is not fit for market progress requirement. In this paper, line losses analysis and management system based on local area network (LAN) is proposed....
This paper proposed a kind of new supervisory system of computer the distribution supervisory system of computer. The system is arranged through scattering, stratified control, which is developmental, and with powerful mutual operating ness etc. The practical experience of the system for eight years in Huajia (Henan) indicated that the system is reliable, safety, real-time and economy.
Grey system theory has been widely used in economic, political, weather, agriculture, industry and dozens of areas, and achieved the desired effect. In this paper, the gray system theory topower volume data for time series, the establishment of GM (1,1) model to predict the amount of power reserves, power resources provide the scientific basis for asset valuation.
This paper describes this development of a test platform of a grid-connection PV station. Essentially this entire platform involves the integration of a Personal computer (PC), a Dc power source, a power analyzer, an AC load and an analog grid to create a grid-connection PV system and to test. This new system boasts of high accuracy measurements coupled with the commercial viability of low cost. In...
According to the theory of Voltage Source Converter (VSC) can control active power and reactive power simultaneously and independently, back-to-back VSC is applied to the synchronous parallel operation in power grids. Combined with the characteristic of UPFC circuit structure, this paper proposes a new scheme based on power transmission which can realize integrated functions of power system synchronization...
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