TBS分选机在王家岭选煤厂的应用

阐述了TBS分选机的工作原理和技术参数。分析了两种TBS分选机入料及产物的粒度和密度组成,对比了两种TBS分选机的分选精度。结果表明:两种TBS分选机的入料粒度组成类似,0.2~1.0 mm质量分数大于60%,属主导粒级,适合采用TBS分选机分选,其精煤灰分均小于10%,尾煤灰分均高于57%,分选效果较好。当精煤灰分为9.50%时,两种TBS分选机的入料煤样均属易选煤。两种TBS分选机的Ep值分别为0.178和0.183,I值分别为0.239和0.246,分选效果基本相同,均达到较高水平,分选下限达到0.2 mm。     

Sensitivity study on in-box LOCA for a Korean HCCR TBM in ITER

Korea has designed a Helium-Cooled Ceramic Reflector (HCCR)-based Test Blanket System (TBS) for International Thermonuclear Experimental Reactor (ITER). Among seven selected reference accidents in Korean TBS, in-box loss of coolant accident (LOCA) is one of them. This is initiated by a double-ended break of the coolant pipe in the Breeding Zone (BZ), pressurizing the BZ box structure, causing pressurization of the Tritium Extraction System (TES) and purging of pipelines. When the accident is detected, the Plant Safety System (PSS) isolates the Helium Cooling System (HCS) and TES, and requests plasma shutdown to Fusion Power Shutdown System (FPSS). To prevent aggravating failure of the system, the safety function is automatically activated when the accident is detected, the device being the isolation valve of HCS and TES. One important observation of this accident is that instant isolation is not a good measure to take. In terms of the possibility of aggravating failure, system isolation is an important safety procedure but isolated TES volume is exposed to high pressure and temperature conditions in the early move of the accident transient. The result of system safety analysis shows that delayed isolation keeps the system safe for a while. In this article, given the preliminary accident analysis results for the current HCCR TBS, case studies were performed regarding the delayed isolation timing effect. For this transient simulation, Korean nuclear fusion reactor safety analysis code (GAMMA-FR) was used.     

Performance of teetered bed separator for non-coal applications

In the present investigation, the effect of the most important process variables, which are teeter water velocity (TW) and pressure set point (SP), on the classification and beneficiation performance of a laboratory-scale teetered bed separator (TBS) was evaluated and discussed. Pure silica sand, magnetite concentrate and their artificial mixture were used to observe the effect of mineral density. Classification test results revealed that separation cut size linearly increases with increasing TW and SP. From the beneficiation studies and the size-by-size chemical analysis of artificial mixture, it can be concluded that significant removal of silica is possible by employing TBS.     

粗煤泥干扰床分选机在三交河矿选煤厂应用

粗煤泥干扰床分选机是近年来引进的一项主要为解决原煤中3~0.5 mm粒级分选难题的洗煤新技术,通过对三交河洗煤厂原煤煤泥可选性的分析及试验室试验,三交河原煤中2 mm以下的颗粒在TBS中有非常良好的分选效果,TBS在现场生产可行。     

我国焦煤资源深度洗选回收工艺路线的探索

文章结合大武口洗煤厂生产实践,对焦煤资源深度洗选回收工艺路线进行了有益探索,通过效益评估,分析论证了焦煤资源深度洗选回收的可行性。     

UPFC晶闸管旁路开关阻尼参数测量技术研究

晶闸管旁路开关TBS是UPFC系统中重要的保护设备,可以在电力系统故障时实现对UPFC的快速旁路和隔离保护。由于TBS只有在系统故障时投入运行,而在系统正常运行时一直处于热备用状态,这种工作特性导致其无法像其他设备一样实现利用在线检测手段来判断晶闸管回路元件状态。本文对常用的晶闸管阻尼回路参数测量方法进行了对比研究,结合TBS晶闸管级阻尼回路特点,提出了一种基于AD5933阻抗测量芯片的TBS晶闸管回路RC阻容参数测量方法,具有快速、准确、可靠等优点。     

Beneficiation routes for upgrading iron ore tailings with a teetered bed separator

The aim of this study was to investigate the possibility of producing sinter/pellet grade concentrate from iron ore tails. Two different wet flow sheets were considered. The first consists of a teetered bed separator (TBS) followed by a gravity concentration resulting in a product quality with 65.54% Fe, 4.96% SiO₂ and 1.50% Al₂O₃ content ensuring 68.52% iron recovery. In the second option, the iron ore tail is treated in a similar approach, but the gravity concentration replaced by magnetic separation results in a product quality with 65.34% Fe, 3.70% SiO₂ and 1.00% Al₂O₃ with 70.91% of iron recovery.     

紫外线吸收剂水杨酸对-叔丁基苯酯的合成

以水杨酸和对-叔丁基苯酚为原料合成水杨酸对-叔丁基苯酯,研究了反应温度、反应时间、原料配比等条件对合成反应的影响,确定了最佳工艺条件.合成水杨酸对-叔丁基苯酯的最适宜的工艺条件是:反应温度90℃、反应时间4 h、n(水杨酸):n(对叔丁基苯酚)为1:1.25,n(水杨酸):n(三氯氧磷)为1:0.58,水杨酸对-叔丁基苯酯的产品收率可达到98.55%以上,产品纯度(质量分数)达到98.5%.     

Silicate-based polymer-nanocomposite membranes for polymer electrolyte membrane fuel cells

Proton-exchange membrane fuel cells have emerged as a promising emission free technology to fulfill the existing power requirements of the 21st century. Nafion^® is the most widely accepted and commercialized membrane to date and possesses excellent electrochemical properties below 80 °C, under highly humidified conditions. However, a decrease in the proton conductivity of Nafion^® above 80 °C and lower humidity along with high membrane cost has prompted the development of new membranes and techniques. Addition of inorganic fillers, especially silicate-based nanomaterials, to the polymer membrane was utilized to partially overcome the aforementioned limitations. This is because of the lower cost, easy availability, high hydrophilicity and higher thermal stability of the inorganic silicates. Addition of silicates to the polymer membrane has also improved the mechanical, thermal and barrier properties, along with water uptake of the composite membranes, resulting in superior performance at higher temperature compared to that of the virgin membrane. However, the degrees of dispersion and interaction between the organic polymer and inorganic silicates play vital roles in improving the key properties of the membranes. Hence, different techniques and solvent media were used to improve the degrees of nanofiller dispersion and the physico-chemical properties of the membranes. This review focuses mainly on the techniques of silicate-based nanocomposite fabrication and the resulting impact on the membrane properties.     

粗煤泥分选工艺在安家岭选煤厂的应用

从原煤性质变化对产品结构的影响,原有系统的工艺环节是否满足能力提升及工艺改造对选煤厂生产的影响3个方面分析了安家岭选煤厂采用粗煤泥分选工艺进行扩能改造的可行性。对比分析了安家岭选煤厂改造前后的工艺流程,并对改造后的效果进行了分析。结果表明:TBS粗煤泥分选提高了系统处理能力,减轻了浓缩机负荷,保证了加压过滤机、浓缩机的稳定生产,提高了主再选重介质旋流器分选下限,减少了细泥在系统中的积聚,提高了脱介筛的脱介效果、处理能力,改善了末煤离心机的脱水效果,降低了介质损耗;正常生产时,TBS分选密度设定为1.20～1.25 g/cm3,顶水压力设定为95 L/min;选煤厂单系统处理能力由原先的750 t/h增至850 t/h,精煤产率提高了2.92%,每月增加利润700.80万元。