风水互补系统最佳风电配置容量方法研究

依托已建水电站输送通道、互补送出风电出力的可行性,为规划风电场的送出开辟了新途径;以云南省某大型水电站及其周边规划风电项目为例,提出了风水互补系统的最佳风电配置容量方法和成果,挖掘现有水电输送通道潜力进行风水互补送出。

W型火焰炉冷态试验及最佳配风方式的研究

对鄂电FW-1 072 t／h W型火焰炉进行了炉内冷态试验及最佳配风方式的研究，由此提出了最佳的配风方式并进行了运行调整及实行效果测定。

煤粉锅炉不同负荷下分级燃烧降低NO_x的试验研究

对一台130 t/h煤粉锅炉进行了分级燃烧技术低氮氧化物排放改造,针对低负荷、满负荷和超负荷的不同工况进行试验研究,以寻求合理的配风方案,满足锅炉的稳定运行与NO_x排放控制的双重标准。试验结果表明:锅炉原先的NO_x排放量为800 mg/m^3左右,经改造后,在低负荷(110~125 t/h)下,上部燃尽风开度90%,中二次风8%,NO_x排放值可低至360 mg/m^3;在满负荷(126~139 t/h)条件下,上燃尽风开度80%,中二次风40%,NO_x排放值可低至360 mg/m^3;在超负荷(140~150 t/h)下,燃尽风开100%,中二次风80%,NO_x排放值可低至340 mg/m^3。针对不同工况下分别寻求最佳配风设置,这对合理使用低NO_x燃烧器、降低氮氧化物排放具有重要意义。

Experimental study on performance of contra-rotating axial flow fan

Contra-rotating axial flow fan is a kind of the vital equipment in coal mines. Their work conditions directly affect the safety of staff and production. In the paper, the performance of the contra-rotating axial flow fan is experi- mentally investigated. The study is focused on the fan performance, the shaft power and the match between the motor and fan efficiency at different blade angles. The results show that the blade angle 43°/26° has the best aerodynamic perfor- mance. The first engine has a greater impact on the fan than the second one. The blade angle with the best aerodynamic performance does not necessarily correspond to the one with the best match between the motor and fan efficiency. The blade angle 43°/24° is the best choice for the operation of the fan in the present study.

Availability. Based Wind Farm Design

The paper develops a methodology for the optimal sizing of a generic wind farms, focusing primarily on reliability aspects, besides the traditional economic ones. A specific objective function is proposed in order to select the better wind farm configuration, based upon the profits related to the economic trading in the deregulated electric market and the costs due to investment, operation ＆ management, and to system unavailability. This objective function is accurately investigated as a function of the turbines number in order to derive the most convenient alternative, which implies also the optimal choice of the single wind generators size. The ranking coming out from this assessment is then compared with that one established in terms of expected load not supplied. A compromise choice, between the best alternatives provided by the two criteria has finally adopted. A simple numerical application is reported in the last part of the paper for testing the validity of the proposed approach. Also uncertainty aspects in the basic input parameters are taken into account and possible way of dealing with them is briefly illustrated.

Preparation of Active Peptides from Corn and Soybean by Bi-enzyme Hydrolysis

[Objective] The aim was to study the optimal test condition for preparation of active peptides from corn and soybean by bi-enzyme hy- drolysis. [Metbod]Taking soybean peptide and corn peptide as materials, different concentrations of soy-corn protein isolate solution were pre- pared. Through pretreatment, and based on compound protease, flavor protease, neutral protease, papaya protease, pineapple hydrolysis, and by measuring the degree of hydrolysis activity and enzyme activity, tested enzyme was determined. Mixing two of those enzymes in certain proportion and by orthogonal test, the optimal condition of enzyme hydrolysis of a double was determined. [ Result] The optimal hydrolysis condition was 2% of substrate concentration, 1 ： 1of hydrolyze compound protease and flavor protease, and 8 h of hydrolysis time, 75.14% of DH. [ Condasien] The study provided a basis for the development and application of active peptides from corn and soybean by bi-enzyme hydrolysis.

Economic Assessment for Optimum Wind Farm Investment Connected to a Distribution System

Decarbonization of electricity industry for the goal of sustainability success has resulted in large investment in alternative energy sources such as wind, solar, biomass. Although these energy resources are sustainable and have the potential of reducing the world carbon foot print, there are costs associated with its utilization. In recent time, electricity from alternative energy sources like wind and solar are not cost competitive with electricity from the conventional power plant. This paper is aimed at investigating the optimum investment in a typical wind farm project using a TSA （time series analysis） alongside simple economic tool, AAP （annual annuity payment） model. This study involves a year round analysis of （8,760h） at different wind farm capacity connected to a 132/33kV DS （distribution system）. It also focused on digressing from the technical and environmental benefits to financial assessment of increasing wind generation capacity in the DS. Indeed, this development presents a risk of investment to the stakeholders which necessitates proper scrutiny and to ensure profitability of the venture. The level of capital cost along with operation and maintenance （OM） costs are either financed by private or public sectors on wind farm with the sole aim of achieving the ROI （return-on-investment）. The results obtained from this study shows the possible ROI is not proportional to the wind capacity invested. Also, a sensitivity analysis conducted revealed the profit derived from wind farm is more responsive to the investment/capital cost and the price at which the electricity is being sold.

Effects of rotor structure on performance of small size axial flow fans

Small size axial flow fans are used as a cooling component for computers,electronic equipment and other electronic components.With the increasing power of electrical equipment,the demand for lower noise and higher ventilation of cooling fan is also increasing.Traditional methods of improving ventilation by raising the fan's rotation speed causes a decrease in efficiency and an increase in noise.In this paper,different structures of fans were simulated,and as a result,the counter-rotating fan can achieve higher pressure,efficiency and facilitate ventilation in a smaller space.Furthermore,some other conclusions are as follows:(1) Higher pressure rise can be obtained by a counter-rotating fan than by the two-stage rotor fan in the same axial length.Meanwhile,the counter-rotating fan has a broader work scope.(2) The main noise type of the counter-rotating fan is rotating noise;the small peak pulse caused by vortex noise mainly due to the eddy current produced by small eddies.(3) When the distance of counter-rotating fans is smaller than 2 times the chord,the greater distance the greater total pressure of the circum-averages and along the axial direction,the total pressure begin to decline until the distance is three times the chord,so there is an optimal distance between rotors.The simulation results are of important significance to the quantitative analysis and optimization design of the counter-rotating fan.

Dynamic optimal strategy for monitoring disease recurrence

Surveillance to detect cancer recurrence is an important part of care for cancer survivors.In this paper we discuss the design of optimal strategies for early detection of disease recurrence based on each patient's distinct biomarker trajectory and periodically updated risk estimated in the setting of a prospective cohort study.We adopt a latent class joint model which considers a longitudinal biomarker process and an event process jointly,to address heterogeneity of patients and disease,to discover distinct biomarker trajectory patterns,to classify patients into different risk groups,and to predict the risk of disease recurrence.The model is used to develop a monitoring strategy that dynamically modifies the monitoring intervals according to patients' current risk derived from periodically updated biomarker measurements and other indicators of disease spread.The optimal biomarker assessment time is derived using a utility function.We develop an algorithm to apply the proposed strategy to monitoring of new patients after initial treatment.We illustrate the models and the derivation of the optimal strategy using simulated data from monitoring prostate cancer recurrence over a 5-year period.