电气自动化系统在烟气脱硫工程中的应用

结合国电宣威发电有限责任公司七期(2×300 MW)机组烟气脱硫工程电气自动化系统(ECS)实施的经验,从应用的角度出发,分析了火电厂ECS通过硬接线、硬接线 通信、全通信3种方式接入DCS的优缺点和需要解决的问题,提出全通信的组网方式,展望了ECS最终实现全通信的前景和目标.     

嘉兴电厂2×300MW机组脱硝方案的对比分析

根据嘉兴电厂的实际情况，在对6种主流脱硝工艺进行技术经济分析的基础上，结合电厂近期和远期的NOx控制目标，对各种脱硝工艺的组合进行研究，推荐了可行的脱硝方案，为工程的实施提供了可靠的技术依据。     

破碎带对地下坑道动力响应影响的数值分析

为了研究破碎带的耗能作用及其对坑道结构动力响应的影响,根据某工程实例,建立了地冲击波作用下类岩体中坑道结构响应的计算模型,利用LS-DYNA3D有限元软件,分别计算了无破碎带和存在破碎带情况下坑道结构的动力响应。计算结果的对比分析表明,顶部破碎带使结构的加速度和位移等运动参数有不同程度的降低,但对结构所受到的应力影响不大;与之相反,侧部破碎带的存在使结构的加速度和位移等运动参数明显地增大。与顶部存在破碎带情况相比,侧部存在破碎带情况下坑道结构运动参数的峰值更大,对坑道结构安全更为不利。     

复合无机防火涂料优配研究

以市售无机膨胀型AB牌防火涂料为研究基础,复合了膨胀阻燃剂(APP-MEL-PER阻燃体系)、抑烟剂和助剂,进行了新型防火涂料的制备,当膨胀阻燃体系(APP-MEL-PER阻燃体系)以17∶6∶6的配比混合于该涂料中,其所占质量百分比为19%的时,防火性能最好。测试表明,该新型防火涂料烟密度等级6.77,指数下降了10,接近于国家标准1级。在248℃~400℃期间失重仅为12%,在390℃,有强烈的吸收峰,也表现了优异的阻燃性能。实现了APP-MEL-PER膨胀阻燃剂和AB牌涂料优配的目的。     

FISH RESPONSES TO TEMPERATURE TO ASSESS EFFECTS OF THERMAL DISCHARGE ON BIOLOGICAL INTEGRITY1

ABSTRACT: The applicability of the U.S Environmental Protection Agency's (USEPA) water temperature criteria in evaluating the impact of a thermal discharge from the P. H. Glatfelter Paper Company, Spring Grove, Pennsylvania, is analyzed. A review of the literature relative to 11 temperature Criteria was conducted for six fish species designated by the USEPA as “representative important species” (RIS) of the West Branch Codorus Creek, Susquehanna River drainage. The species were: Notemigonus crysolcucas (golden shiner), Notropis analostanus (satinfin shiner), Rhinichthys atratulus (blacknose dace), Catostomus comme-soni (white sucker), Lepomis gibbosus (pumpkinseed). and Micropterous salmoides (largemouth bass). It was found that by applying only USEPA suggested criteria that a complete evaluation was not satisfactory. Temperature behavior data, specifically preference and avoidance information, coupled with field sampliug was needed to properly assess the effects of the thermal effluent. The final analysis indicated that the thermal discharge of the paper company should have minimal effect on the fish community of Codorus Creek.     

商业区与轻轨站厅开口处防火分隔失效时人员安全疏散评估

针对相连接部位开口处的防火分隔失效时人员能否安全疏散进行评估,研讨人员安全疏散评估过程中所采用的定性分析和定量分析方法。以某商场与轻轨站相连接开口处为例,考察当防火分隔耐火性能失效后,商场内人员和轻轨站的人员能否从火灾中得以安全疏散;通过火灾模拟的方法,采用BuildEvac和FDS软件分别对火灾时人员疏散状况和火灾烟气的蔓延情况进行人员疏散模拟和火灾烟气运动模拟。根据模拟计算结果,对商场内人员和轻轨站人员的安全性进行详细分析和讨论,从而得出实例评估结论:当排烟系统正常工作时,即使防火分隔(防火卷帘)失效,火场环境对商业区和轻轨站的人员生命安全在整个疏散过程中均不会构成威胁,所有人员都能安全疏散到安全地点。     

污泥厌氧消化预处理技术综述

全球环境问题已成为国际社会关注的焦点,围绕全球气候变化,降低温室气体排放,寻求再生能源,节能减排已成为目前国际科技发展的方向。通过"十一五"污水处理厂的建设,每年污泥产量已接近3000万吨(含水率80%脱水污泥计)以上,且以每年10%的速度递增。其处理与处置是制约社会经济发展的重要问题。但是,城市污泥蕴含有大量生物质能,通过借鉴国外先进技术与经验,开发城市污泥生物质能提取和利用技术,对我国节能减排具有重要战略意义。由于细胞壁的存在,使得污泥水解成为限制厌氧消化效率的重要瓶颈,而污泥强化预处理可有效提高污泥细胞壁的破坏,溶出胞内有机物,最大化回收剩余污泥中的有机能源。目前,预处理技术较多,如超声波预处理、热处理、微波预处理、碱解处理、臭氧预处理等,本文从物理、化学等角度分析了不同预处理对厌氧消化技术的影响。     

Enhanced retention of linuron, alachlor and metalaxyl in sandy soil columns intercalated with wood barriers

A study has been made of the effect a reactive barrier made of pine (softwood) or oak (hardwood) wood intercalated in a sandy soil column has on the retention of linuron, alachlor and metalaxyl (pesticides with contrasting physicochemical characteristics). The leaching of pesticides has been carried out under a saturated flow regime and breakthrough curves (BTCs) have been obtained at flow rates of 1 mL min⁻¹ (all pesticides) and 3 mL min⁻¹ (linuron). The cumulative curves in the unmodified soil indicate a leaching of pesticides >80% of the total amount of compound added. After barrier intercalation, linuron leaching decreases significantly and a modification of the leaching kinetics of alachlor and metalaxyl has been observed. The theoretical R factors increased ∼2.6-3.3, 1.2-1.6-fold, and 1.4-1.7-fold and the concentration of the maximum peak decreased ∼6-12-fold, 2-4-fold and 1.2-2-fold for linuron, alachlor and metalaxyl, respectively. When considering the three pesticides, significant correlations have been found between the theoretical retardation factor (R) and the pore volume corresponding to the maximum peaks of the BTCs (r = 0.77; p < 0.05) or the total volume leached (r = −0.78; p < 0.05). The results reveal the efficacy of reactive wood barriers to decrease the leaching of pesticides from point sources of pollution depends on the type of wood, the hydrophobicity of the pesticide and the adopted water flow rate. Pine was more effective than oak in decreasing the leaching of hydrophobic pesticide linuron or in decreasing the maximum peak concentration of the less hydrophobic pesticides in soils. Efficacy of these wood barriers was limited for the least hydrophobic pesticide metalaxyl.     

从"珠三角火力发电厂排污交易试验计划"看粤港区域环境管理制度创新机遇

总结排污交易在中国的发展历程,展望"珠三角火力发电厂排污交易试验计划实施方案"实施,粤港区域环境管理将面临着一次新的挑战,也是区域环境保护制度创新的重大机遇.     

火力发电厂安全现状评价模式探讨

以火电厂现状评价为例,探索火力发电厂安全现状评价模式。