高掺量粉煤灰混凝土在大型动力设备基础中的应用

通过对40^m、63^m、800^t，3个大型动力设备基础混凝土中掺30％粉煤灰的应用证明：高掺量粉煤灰不仅可降低大体积混凝土的水化热、延缓凝结时间，使必须连续浇灌又不能留施工缝的实心块体动力基础施工变得简单，并且提高了混凝土与钢筋的握裹力、弹性模量、抗折强度以及后期抗压强度，对承受动力冲击负荷亦有良好的力学性能。     

Thick suspension technology for fly ash transportation and disposal at a coal fired power plant

Modified technology for fly ash transportation and disposal was tested on a pilot plant at the “?o?tanj” Power Plant. The main advantage of this technology is in reduced water requirements for ash transportation and consequent smaller load on the environment with polluted water. The environmental impact of ash sludge deposited in this way was investigated and is described here.     

电厂燃煤灰渣中微量元素富集规律的试验研究

采用原子吸收分光光度法和X射线荧光光谱法对南京某热电厂220 t/h煤粉锅炉在不同工况燃烧时底渣和电除尘器飞灰中微量元素Mn、Cr、Pb、As、Se、Zn、Cd和Hg的含量进行了分析,研究了燃烧工况的变化对飞灰和底渣中重金属富集的影响.飞灰中微量元素的分布一般存在以下关系:Hg相似文献   

激发剂在路面用大掺量粉煤灰混凝土中的应用试验研究

本文通过将两种组合的激发剂和外掺剂用于大掺量粉煤灰混凝土（粉煤灰掺量为50％）的试验，研究大掺量粉煤灰混凝土抗压和抗折强度发展规律，探讨激发剂和外掺剂的作用机理。     

垃圾焚烧发电主厂房结构设计关键问题探讨

对垃圾焚烧发电主厂房结构设计过程中经常会遇到的垃圾仓超长无缝设计问题、卸料平台车辆荷载取值问题进行了深入探讨,并给出了建议的解决方案,对类似工程有借鉴意义。     

电厂燃烧黑液-水煤浆所排灰渣用于制砖的可行性

目前,国内外用造纸黑液与煤制备洁净燃料已有报道,在中小锅炉上燃烧处理已获得成功,但将其用于电站锅炉的研究还是空白。新矿集团与圣龙集团联合开发的黑液-水煤浆发电供热项目,无疑是一项开创性的工作。黑液-水煤浆碱含量高,燃烧后的废弃物具有高碱性。而新矿集团与圣龙集团的工程上马后,每年将产生大量高碱性灰渣,考虑到不再走先污染后治理的老路,青岛科技大学化学系承担了处理该高碱粉煤灰渣的研究任务。1摇高碱粉煤灰与普通粉煤灰的成分差别3个高碱灰渣样品包括炉壁灰、炉底渣和烟管实灰,其化学成分见表1。表1摇黑液-水煤浆高碱灰渣化学…     

粉煤灰和废玻璃制备高强复合陶粒的试验研究

以粉煤灰和废玻璃为主要原料,辅以粘结剂和造孔剂等添加剂,烧制了高强复合陶粒.研究了不同配合比和不同焙烧制度等对陶粒性能的影响,得到了制备高强复合陶粒的合适工艺条件.试验结果表明,在一定工艺条件下,所制得的高强复合陶粒的筒压强度可达9.9 MPa,堆积密度为947 kg/m3,1h吸水率为3.6％;X射线衍射和扫描电镜分析表明,在焙烧粉煤灰和废玻璃的过程中生成了大量影响陶粒强度的非晶态凝胶相,内部产生了大量均匀气孔.     

长山热电厂高掺量高性能粉煤灰蒸压砖的生产与研究

1生产用原材料生产所用原材料包括粉煤灰(化学成分见表1)、激发材料、骨料、专用外加剂(表2)。其中:激发材料由气硬性和水硬性胶凝材料按一定比例配制,经混合磨细而成;骨料为中砂或瓜子石,粒径0～10mm。2生产原理化学反应原理粉煤灰(重量比掺量70%以上)在水、激发剂和专用外加剂的作用下,在192℃以上、1.2～1.6MPa下,材料各组分中的Ca(OH)2与SiO2、Al2O3反应生成有利于提高制品性能的稳定晶格结构的水化产物。这些水化产物均匀分布并包裹骨料中的粗、中、细各等级颗粒,形成骨架结构致密的硅酸盐混凝土制品,即得到高掺灰量高性能蒸压砖。…     

Effect of environmental temperature and fly ash addition in hydraulic lime grout behaviour

The purpose of grout injection is to increase the compactness of the masonry and its injection optimization is a task of major importance for masonry consolidation. Fresh grout properties seem to be as important as the ones in the hardened state since grout consistency is an essential characteristic to allow the filling of voids. Since the grout rheological behaviour is associated with its fresh properties, they should be well understood and controlled so that the fluid may be pumped and flow correctly inside the porous media. This paper analyses some relevant rheological properties for natural hydraulic lime grouts, such as yield stress, plastic viscosity, consistency and power-law index. The study envisage to increase the understanding of the influence of environmental temperature and of the addition of fly ash in fresh grouts behaviour. An attempt was made to achieve an optimal grout composition by using the Taguchi method. The paper shows that fly ash is capable of substantially changing the grout rheological parameters, while the effect of temperature is negligible for the parameters tested.     

Removal of DDD and DDE from wastewater using bagasse fly ash, a sugar industry waste

Bagasse fly ash, a waste from the sugar industry, was converted into an effective adsorbent and was used for the removal of DDD [2,2-Bis(4-chlorophenyl)-1,1-dichloroethane] and DDE [2,2-Bis(4-chlorophenyl)-1,1-dichloroethene] pesticides from wastewater. The DDD and DDE are removed by the developed adsorbent up to 93% at pH 7.0, with the adsorbent dose of 5 g/l of particle size 200-250 microns at 30 degrees C. The removal of these two pesticides was achieved up to 97-98% in column experiments at a flow rate of 0.5 ml/min. The adsorption was found to be exothermic in nature. The bagasse fly ash system has been used for the removal of DDD and DDE from the wastewater. The developed system is very useful, economic, and reproducible.     

Seismic retrofit design and risk assessment of an irregular thermal power plant building

Electric power system is one of essential lifeline systems for an urban community. An actual power plant building with typical coal‐fired power generation process is selected to be studied in this paper. The detrimental impacts on the seismic performance of the structural system induced by heavy coal bunkers and irregular bracing configurations are expected to be mitigated by using retrofit strategies. A total of three retrofit design schemes that employ the isolation and supplemental damping techniques are developed. The original design scheme of the actual thermal power plant building that adopts steel special concentrically braced frame as lateral‐force resisting system is used as benchmark for comparison purposes. Nonlinear response‐history analyses are performed, and the obtained seismic responses are compared. To better quantify the benefit of the considered retrofit strategies, seismic risk in terms of probabilities of exceeding designated damage states as well as the downtime are analyzed. For the studied thermal power plant building, the results show that the added damping system is more effective in seismic risk reduction than the isolation for heavy coal bunkers. Compared to the original structural system design, the use of supplemental damping system cut the downtime of the thermal power plant building at most 42%.     

某电厂专用线粉煤灰路基设计及施工注意事项

结合秦岭电厂专用线路基设计实例,阐述了粉煤灰路基设计要点及注意事项,总结了粉煤灰路堤施工中需要注意的问题,指出在利用粉煤灰设计、施工时,需充分利用粉煤灰的特性,以保证粉煤灰路基安全、稳定。     

新疆某电厂灰场区域湿陷性地基处理

结合新疆某电厂贮灰场的水文地质情况,分析了湿陷性黄土区域的地基处理方案,阐述了垫层法结合排水、封闭措施的施工技术,实践证明,采用该方法既消除了黄土的湿陷性,又节省了工程造价。     

大掺量粉煤灰蒸压砖在严寒地区的生产技术、存在问题、解决方案

介绍了大掺量粉煤灰蒸压砖在严寒地区的生产技术及工艺流程、存在的问题及几种解决方案,供生产企业及使用单位参考。     

Utilization of municipal solid waste incineration ash in stone mastic asphalt mixture: Pavement performance and environmental impact

The objective of this study is to the use of municipal solid waste incinerator (MSWI) fly ash as a partial replacement of fine aggregate or mineral filler in stone matrix asphalt (SMA) mixture. For saving natural rock and reusing solid waste, basic oxygen furnace slag (BOF slag) was used as part of coarse aggregate. And this makes SMA mixtures contain more than 90% solid waste materials by mass. A comparative study of the performance of two mixes designed using superior performance asphalt pavements (SUPERPAVE) and Marshall mix design procedures was carried out in this research. Samples from both mixes were prepared at the design asphalt contents and aggregate gradations and were subjected to a comprehensive mechanical evaluation testing. These tests included Marshall stability, water sensibility, resilient modulus, fatigue life and rutting. In all the performed tests SUPERPAVE mixtures proved their superiority over Marshall mixtures. TCLP test for environmental impact indicated that asphalt is an effective stabilization and solidification agent for heavy metal in MSWI ash. The heavy metal leachates in TCLP tests have great positive correlation with their initial concentration in waste. But Ni is an exception that lower initial concentration leaded to higher cumulative leaching rate.     

基于山区水文地质条件下燃煤电厂贮灰场地下水生态环境影响预测

基于我国以煤炭为主的能源结构,火力发电厂仍然在发电领域占有绝对的统治地位。但与此同时,火力发电的副产品粉煤灰堆放问题日益成为社会性问题。由于京津冀地区空气和地下水污染防控的巨大压力,环保问题成为困扰电厂灰场的一大问题。通过对石家庄井陉某大型火力发电厂灰场(灰渣体积31×10~4m^3)的地下水资料收集、现场调查、水质检测、数据分析预测,对井陉地区水文地质条件进行模型概化,用数值模拟的方法预测灰场特征污染物氟化物和六价铬的污染运移情况,探讨分析了灰场污染物泄漏进入地下水环境的迁移范围和影响程度,认为该灰场地下水对周边环境影响很小,从而对灰场的地下水生态环境保护提供指导作用。     

印尼Paiton电厂的开发经验及教训分析

本文通过分析印尼Paiton电厂项目，找出其不成功的原因，吸取经验教训，避免重蹈覆辙。主要的经验教训是：①市场对项目产品的需求比购买担保更重要，购买协议中应包括适当的控制措施保证产品的需求；②注意电价调节机制作为降低风险措施的局限性，应预测极端事件并把它排除在收费调节机制之外；⑥尽量降低单位成本(整个项目生命周期成本)，避免建造非生产性设施；④注意“高风险高回报”风险管理策略的不利因素，避免该风险管理策略用于纯风险。这些教训对今后类似的电厂项目有重要的参考价值。     

生活垃圾焚烧技术现状与发展趋势

我国垃圾焚烧设施的建设状况 1、总体状况 城市生活垃圾焚烧处理具有占地小、场地选择较易,处理时间短、减量化显著（减重一般达80％,减容一般达90％。）．无害化较彻底以及可回收余热等优点。目前生活垃圾焚烧技术在我国正处于快速发展阶段,截止到2008年9月统计,全国共建设生活垃圾焚烧厂100座,     

Use of power plant bottom ash as fine and coarse aggregates in high-strength concrete

In this study, experiments have been carried out to evaluate the utilization of bottom ash (by-product of power plant) as fine and coarse aggregates in high-strength concrete with compressive strength of 60–80 MPa. Firstly, the chemical and physical characteristics of bottom ash particles, such as chemical compositions, specific gravity and SEM images, were investigated. Further experiments were conducted by replacing fine and coarse bottom ash with normal sand and gravel varying in percentages (25%, 50%, 75%, and 100%). The effect of fine and coarse bottom ash on the flow characteristics and density of concrete mixture was investigated in the aspect of particle shapes and paste absorption of bottom ash. Mechanical properties, such as compressive strengths and modulus of elasticity and flexural strength of high-strength concrete with bottom ash were evaluated. It was found that the slump flow of fresh concrete was slightly decreased from 530 mm to 420 mm when coarse bottom ash was replaced 100% of normal coarse aggregates, while fine bottom ash did not affect the slump flow. Moreover, it also showed that both of fine and coarse bottom ash aggregates had more influence on the flexural strength than compressive strength.     

百万千瓦级核电站管施工中水压试验若干问题

阐述了水压实验用水温度、环境温度对水压实验结果的影响,建议进行水压试验时,应重视水温和环境温度的差异,使水压试验数据准确,以确保工程质量。