电能表数据采集器研发及应用

介绍了电能表数据采集器的特点及功能。并从硬件和软件设计对采集器的开发进行了论述。电度表数据采集器在莱钢能源计量管理系统得到广泛应用,保证了生产稳定。     

云南迪庆氧硫混合铜矿选矿试验研究

我国氧硫混合铜矿资源丰富,对这类铜矿进行高效选矿富集具有重要意义.云南迪庆地区有大量氧硫混合铜矿,铜品位0.67％,氧化率17.37％,含铜矿物主要为黄铜矿、斑铜矿和孔雀石.采用硫化—黄药浮选法对该矿石进行选矿,分析了活化剂和捕收剂的作用机理.研究了磨矿细度、药剂制度及粗精矿再磨等对浮选指标的影响.结果表明,以石灰为抑...     

Application of three xanthates collectors on the recovery of nickel and pentlandite in a low-grade nickel sulfide ore using optimum flotation parameters

One of the challenges encountered when processing nickel ore is the presence of other minerals like chalcopyrite, pyrrhotite, pyrite and amphiboles in mineral dressing. Hence, there is need to investigate the selectivity of some collectors at optimum flotation parameters (particle size, milling time, pH and flotation cell) to maximize nickel and pendlandite recovery. Three xanthate collectors, namely potassium amyl xanthate (PAX), sodium isobutyl xanthate (SIBX) and sodium ethyl xanthate (SEX), were investigated in this study. In order to achieve this aim, the physical treatment of nickel sulfide ore and percentage chemical composition of nickel sulfide ore were investigated. The analyses of the concentrates were done using x-ray diffraction (XRD) and x-ray fluorescence spectroscopy (XRF). The optimum nickel and pentlandite recovery was achieved at particle size of 64.73 µm milled for 1.5 h, pH of 9.65 and using a new flotation cell. Also, SEX collector recovered more nickel and pentlandite contents compared to PAX and SIBX collectors when optimum parameters of particle size, milling time, pH and flotation cell were considered. In conclusion, the results showed that the selectivity of SEX is the strongest and will recover more pentlandite in a complex and low-grade nickel sulfide ore.     

Computational evaluation of solar heating systems using concrete solar collectors

This paper uses the F-chart technique to evaluate three types of solar heating systems, namely; space solar heating and domestic hot water system (SHDHW), domestic hot water system (DHW) and solar swimming pool heating system (SPHS), using three types of concrete solar collectors, models A, B, and C, and one conventional metallic solar collector.

The economical analysis of SHDHW system revealed that the concrete collectors provided about 49 and 63% of the annual load when the collecting area of the solar panel increased from 55 to 88 M² (25 to 40% of the building roof area). The corresponding solar contributions when conventional metallic collectors were used are 41 and 53%, respectively. This represents an improvement of the annual solar fraction of about 19% when concrete collectors are used instead of the metallic collectors.

It was found that solar heating systems with concrete solar collector models gave higher solar fractions and total life cycle savings than the conventional solar metallic collector.     

贵州织金中低品位磷矿浮选试验研究

对织金低品位磷矿加入自制捕收剂(WF-02)进行了反浮选研究,采用分段加入捕收剂的方式,考察了捕收剂用量、抑制剂用量、磨矿细度、矿浆浓度、浮选时间对P2O5品位和回收率的影响。试验结果表明:在WF-02用量为1.0kg/t矿,磷酸用量为10kg/t矿,矿浆浓度为35%,磨矿细度-0.074mm占89%,浮选时间9min的条件下,磷精矿的P2O5品位可从原矿的21.90%增加到33.19%,回收率达到89.89%,获得了较好的浮选效果。     

一种应用于两级降压收集极的绝缘导热瓷件的结构设计

介绍了一种绝缘导热瓷件的结构设计,从材料的选择、绝缘距离的考虑等方面进行了考虑,给出了设计结果及实际应用情况。     

COUNTER-CURRENT REACTOR IN ACID CATALYZED CELLULOSE HYDROLYSISdagger;

A mathematical model was developed for a counter-current reactor to investigate its performance in acid catalyzed cellulose hydrolysis. The results indicated that use of this reactor would be advantageous particularly in obtaining high product yield. The predicted yield of above 70% under normal reaction conditions was substantially higher than those achievable from plug flow (28%) or percolation reactor (54percnt;).     

Dynamic modelling of a low-concentration solar power plant: A control strategy to improve flexibility

This paper deals with a dynamic analysis on a low concentration solar power plants coupled with Organic Rankine Cycles (ORC), which can be an alternative to PV systems because of their capability of providing a smoother electricity production due to their thermal inertia. At least within certain restraints, moreover they are able to exploit diffused solar radiation.The dynamic model of a plant with static Compound Parabolic Collectors and an ORC system, using a rotary volumetric expander, was developed using the simulation tool AMESim. All the main components of the plant are modelled: solar collectors field, heat transfer fluid circuit, heat exchangers and the ORC system. The plant response to the radiation of different days was analyzed to quantify the daily production and the trend of various plant parameters. Real ambient conditions were employed for the simulations by using data obtained by historical series.The results showed that the employment of a volumetric expansion device with variable rotating speed allows the plant to operate at different radiations and ambient temperatures without the need of any storage system or external heat sources. Results can be extended to other applications, such as low temperature waste heat recovery or geothermal systems.     

AC IMPEDANCE STUDY OF POROUS CARBON COLLECTORS FOR Li/SO2, PRIMARY CELLS

Impedance measurements are used to determine the electrochemically active surface area of Teflon-bonded, porous carbon current collectors which are used in Li/SO₂ primary cells. An effective pore radius, pore length, and pore number also result from these measurements. Results are compared to BET measurements. In 0.1 M LiBr/acetonitrile electrolyte, only a small fraction of the BET surface area is electrochemically active.