超低排放燃煤电厂颗粒物脱除特性

在京津冀某660 MW超低排放发电机组,通过低压撞击器(DLPI)颗粒物取样系统对选择性催化还原装置(SCR)、低低温省煤器(LLTe)、静电除尘器(ESP)、高效湿法脱硫塔(WFGD)、湿式静电除尘器(WESP)进出口烟气中的颗粒物取样,通过滤膜取样系统对WFGD、WESP进出口颗粒物进行同步取样.获得了超低排放改造后,不同烟气处理设备对PM1、PM1~2.5、PM_(2.5~10)的脱除效率.结果表明,SCR能够明显增加PM1的质量浓度,PM1增加了52.11%;LLTe能够显著提高ESP的脱除效率,尤其是0.1~1μm范围内的颗粒物;WFGD能够协同脱除SO_2和颗粒物,但会增加PM1的排放,PM1质量浓度增加了59.41%,PM10中水溶性Mg2+、Cl-、SO2-4组分增加;WESP对PM1、PM1~2.5、PM_(2.5~10)均有较高的脱除效率,能够进一步降低颗粒物质量浓度.超低排放技术路线下,该燃煤电厂最终排放的PM10质量浓度为2.04 mg·m~(-3).     

“三软”煤层注水封孔技术的试验研究

在分析“三软”煤层封孔特性的基础上 ,选择了合适的封孔方法 ,试验研究了Bimbar1型封孔器封孔技术 ,并对封孔器应用中的问题进行了讨论 ,设计了一种与之配套使用的单向自动截止阀 ,成功地实现了“三软”煤层注水封孔 ,可供类似条件的煤层实施该技术参考。     

烟气脱硝装置臭氧腐蚀性安全评估

根据烟气脱硝装置工艺特点,利用臭氧腐蚀性测试装置,开展了金属材质的腐蚀性研究。通过扫面电镜对不同材质腐蚀前后的表面形貌进行表征,确定了臭氧对不同材质的腐蚀特性,通过理论计算确定了臭氧分解的绝热温升。结合脱硝装置工艺特点对氧气管道流速控制方面进行了分析和总结,根据分析结果给出了建议。     

电除尘器末端微细粉尘收集装置研究

电除尘器末端是针对二次扬尘超细粉尘颗粒的收集的最后一道屏障。通过分析前人在此方面开展研究的技术成果基础上,集成多项技术,探索一条经济性较高的电除尘器增容提效改造的途径。     

防雷接地装置腐蚀影响因素的层次分析法

防雷接地装置是保证防雷系统正常运行的基础,然而,它不可避免会受到土壤的腐蚀。首先对防雷接地装置腐蚀机理进行了论述;其次通过整理、分析文献资料,合理选取影响防雷接地装置腐蚀的主要因素;然后根据腐蚀因素参与腐蚀的程度,构建层次分析模型,利用模型对腐蚀因素进行定量分析,界定出影响因素对防雷接地装置腐蚀影响的权重值;最后对腐蚀因素进行综合排序。研究表明,影响防雷接地装置腐蚀的最主要因素为pH值、土壤电阻率和含水量,这为制定经济合理、安全可靠的防雷接地装置腐蚀防护措施提供了科学依据,具有实际工程应用价值。     

The input efficiency of chord keyboards

This study focused on an innovative mobile input device model that integrated ergonomic design principles to create a chord keyboard for use in concert with pointing devices. We conducted usability tests to demonstrate the operating performances of such keyboards using keys with four characters per key. Twelve right-handed subjects between the ages of 20 and 30 years and with no wrist disability participated in the usability tests. We analyzed the resulting data to compare the differences among the means. The results indicated that keyboards with multiple characters per key created some confusion among users but that keys with multiple characters per key nonetheless resulted in better input performance.     

硫化物测试条件的优化

针对硫化物从采样、运输、分析全过程中,特别是预处理阶段损失严重,导致测定结果经常为未测出,加标回收率低的问题,通过调查分析制定对策;对样品的采集固定、预处理吸收利用量、吹气速度等条件进行了优化选择,对硫化物预处理装置进行技术革新。减少了硫化物的吸收损失、逸散损失,提高了硫化物回收率和准确度。并通过多次实验及加标回收率的验证,取得了良好效果。     

电气设备火灾的特点与扑救

阐述电气设备火灾的特点与扑救方法,并提出火灾扑救中应注意的问题。     

V型滤池工艺设计的标准化和智能化探讨

针对V型滤池的设计特点,提出了设计的标准化方法。利用AutoCAD内嵌的Visual LISP语言编程,实现了计算机自动设计、计算及绘图的功能。程序具有人机对话的功能,从而实现了设计的智能化。     

Simulated Limnological Effects of the Shasta Lake Temperature Control Device

We estimated the effects of a temperature control device (TCD) on a suite of thermodynamic and limnological attributes for a large storage reservoir, Shasta Lake, in northern California. Shasta Dam was constructed in 1945 with a fixed-elevation penstock. The TCD was installed in 1997 to improve downstream temperatures for endangered salmonids by releasing epilimnetic waters in the winter/spring and hypolimnetic waters in the summer/fall. We calibrated a two-dimensional hydrodynamic reservoir water quality model, CE-QUAL-W2, and applied a structured design-of-experiment simulation procedure to predict the principal limnological effects of the TCD under a variety of environmental scenarios. Calibration goodness-of-fit ranged from good to poor depending on the constituent simulated, with an R ² of 0.9 for water temperature but 0.3 for phytoplankton. Although the chemical and thermal characteristics of the discharge changed markedly, the reservoir's characteristics remained relatively unchanged. Simulations showed the TCD causing an earlier onset and shorter duration of summer stratification, but no dramatic affect on Shasta's nutrient composition. Peak in-reservoir phytoplankton production may begin earlier and be stronger in the fall with the TCD, while outfall phytoplankton concentrations may be much greater in the spring. Many model predictions differed from our a priori expectations that had been shaped by an intensive, but limited-duration, data collection effort. Hydrologic and meteorological variables, most notably reservoir carryover storage at the beginning of the calendar year, influenced model predictions much more strongly than the TCD. Model results indicate that greater control over reservoir limnology and release quality may be gained by carefully managing reservoir volume through the year than with the TCD alone. RID=" ID=" Author to whom correspondence should be addressed. e-mail: John_Bartholow@USGS.gov