喷流床气化技术选择对IGCC系统能量利用效率的影响

气化炉是整体煤气化联合循环(integrated gasificationcombined cycle,IGCC)中的核心设备之一,气化技术的选择会对系统发电效率产生重要影响。文中采用GT Pro软件,分别对以壳牌(Shell)炉、德士古(GE/Texaco)炉(分激冷流程和废锅流程)和三菱(MHI)空气气化炉为合成气气源的4种IGCC系统进行流程模拟,并在此基础上探讨气化技术对IGCC系统能量利用效率的影响和内在机制。计算结果表明,整体系统的能量转化和分配受气化岛的进料形式、氧化剂选择和合成气显热回收方式等因素的影响。在采用Shell气化炉的IGCC系统中,煤炭能量更多地转化为合成气的化学能,易获得较高的系统效率;而采用GE废锅流程和空气气化炉,煤炭能量中转化为合成气物理显热的比例增加,并以蒸汽形式回收利用。     

巴基斯坦SAIF发电厂燃机小岛运行试验分析

由于燃机具备启动快速的特点,故比较适合作为电网事故情况下黑启动电源,此时燃机能够运行在小岛模式显得尤为重要.介绍了巴基斯坦SAIF发电厂燃机小岛运行试验的情况,主要分析了GE公司燃机小岛运行逻辑的设计思想,并对试验的过程及试验过程中出现的问题及解决方法进行了总结.试验证明,GE公司的燃机具备比较优良的小岛运行能力.     

Design strategy for optimizing power consumption of sensor node with Min(N,T) policy M/G/1 queuing models

Energy saving is an important issue in wireless sensor networks for majority of sensor nodes equipped with non‐rechargeable batteries. To prolong the lifetime of sensor nodes, most research works have focused on how to tune the duty cycling schemes among nodes to save the communication cost using multifarious wake‐up strategies. To this aim, we propose a novel design strategy for mitigating the average power consumption of sensor node using the Min(N,T) policy M/G/1 queuing theory. The basic point of our approach is that Min(N,T) dyadic policy would mitigate the total average times of medium contention by having both a counter (N) and a timer (T) for the control of triggering on a radio server to transmit queued packets, and then the power consumption of communication can be alleviated. A comprehensive mathematical analysis on the optimal control parameters had been made. Much data analysis and simulations had been conducted to validate the proposed model. In this article, we show how the improvement level on power consumption can be achieved through analytical and simulation results. With little or no extra management cost, the proposed add‐on power‐saving technique can provide a design strategy to optimize relevant system parameters including power consumption and latency delay. Copyright © 2011 John Wiley & Sons, Ltd.     

基于AHP模型和GE矩阵模型的企业煤化工产业发展路径分析与评价

以陕西煤业化工集团有限责任公司为实例,对企业煤化工产业发展路径进行了研究。采用AHP模型首先确定了评价指标体系要素的评分标准和权重值,然后结合煤化工产业现状,对行业吸引力和相对竞争力所包含的各个要素指标进行了系统的分析,最后采用GE矩阵模型对评价结果进行了比较,确定了煤化工发展路径的优先顺序,以期对企业编制煤化工发展规划起到指导作用。     

A new method for secured optimal power flow under normal and network contingencies via optimal location of TCSC

In the deregulated power industry, private power producers are increasing rapidly to meet the increase demand. The purpose of the transmission network is to pool power plants and load centers in order to supply the load at a required reliability, maximum efficiency and at lower cost. As power transfer increases, the power system becomes increasingly more difficult to operate and insecure with unscheduled power flows and higher losses. FACTS devices such as Thyristor Controlled Series Compensator (TCSC) can be very effective to power system security. Proper location of TCSC plays key role in optimal power flow solution and enhancement of system performance without violating the security of the system. This paper applied min cut algorithm to select proper location of TCSC for secured optimal power flow under normal and contingencies operating condition. Proposed method requires a two-step approach. First, the optimal location of the TCSC in the network must be ascertained by min cut algorithm and then, the optimal power flow (OPF) with TCSC under normal and contingencies operating condition is solved. The proposed method was tested and validated for locating TCSC in Six bus, IEEE 14-, IEEE-30 and IEEE-118 bus test systems. Results show that the proposed method is good to select proper location of TCSC for secured OPF.     

Polyphenol Containing Sorghum Brans Exhibit an Anti-Cancer Effect in Apc Min/+ Mice Treated with Dextran Sodium Sulfate

Colon cancer (CC) is considered a high-risk cancer in developed countries. Its etiology is correlated with a high consumption of red meat and low consumption of plant-based foods, including whole grains. Sorghum bran is rich in polyphenols. This study aimed to determine whether different high-phenolic sorghum brans suppress tumor formation in a genetic CC rodent model and elucidate mechanisms. Tissue culture experiments used colorectal cancer cell lines SW480, HCT-116 and Caco-2 and measured protein expression, and protein activity. The animal model used in this study was APC Min+/mouse model combined with dextram sodium sulfate. High phenolic sorghum bran extract treatment resulted in the inhibition of proliferation and induced apoptosis in CC cell lines. Treatment with high phenolic sorghum bran extracts repressed TNF-α-stimulated NF-κB transactivation and IGF-1-stimulated PI3K/AKT pathway via the downregulation of β-catenin transactivation. Furthermore, high-phenolic sorghum bran extracts activated AMPK and autophagy. Feeding with high-phenolic sorghum bran for 6 weeks significantly suppressed tumor formation in an APC Min/+ dextran sodium sulfate promoted CC mouse model. Our data demonstrates the potential application of high-phenolic sorghum bran as a functional food for the prevention of CC.     

GE水煤浆气化炉的结构设计特点分析

分析了以水煤浆为原料的GE煤气化工艺气化炉的结构设计特点。该气化炉采用非催化部分氧化法制合成气（CO＋H2）,合成气由燃烧室（气化反应室）通过激冷环冷却进入激冷室。气化炉主要由燃烧室、激冷室、耐火衬里、激冷组件及气化烧嘴等部件组成。     

万兆以太网物理层编码子层转换芯片研究

研制了符合IEEE802.3ae万兆以太网10GBASE-R标准物理层编码子层转换芯片,该转换芯片采用单片FPGA进行10GBASE-R标准中万兆以太网16比特接口(XSBI)与10Gb介质无关接口(XGMII)的相互转换,实现了物理层编码子层(PCS)的全部功能,并在万兆以太网物理层传输实验系统中进行了验证。     

A/O氧化沟污水处理工艺及自动化控制

简介A/O改良型氧化沟污水处理工艺以及污水处理的PLC自动控制系统.     

GE 90-30 PLC在液氯充装系统中的应用

介绍了GE 90-30 PLC控制系统在液氯充装系统中的应用情况,分析了控制系统的硬件结构、控制程序软件流程以及计量秤和其他仪表的选型.