泡沫玻璃砖在烟囱防腐中的应用

火电厂燃煤烟气中存在一定量的SO3,会显著降低烟气的酸露点。由于湿法脱硫后烟温低于酸露点,烟气中的SO3与水蒸汽形成的硫酸蒸汽会凝结下来,造成混凝土烟囱的低温腐蚀。以2×135MW机组烟气脱硫技改工程湿烟囱防腐为例,详细介绍了烟囱内衬泡沫玻璃砖防腐的施工工序、技术要求及注意事项。     

耐酸胶泥用于脱硫烟囱防腐的可行性初探

结合一失败案例,探讨了耐酸胶泥内衬用于脱硫烟囱排烟筒防腐的技术可行性。从设计、施工、材料特性等方面进行了分析,得出了耐酸胶泥内衬在脱硫后湿烟囱排烟筒中应慎用的结论。     

石灰石-石膏湿法烟气脱硫装置的防腐蚀

主要介绍了华能珞璜电厂 4× 36 0MW机组石灰石 -石膏湿法烟气脱硫装置的内衬防腐技术及防腐蚀效果。通过对装置的运行考核 ,分析鳞片树脂衬里防腐蚀的对症性和可靠性     

湿法烟气脱硫烟囱防腐技术探讨

介绍了湿法脱硫烟气的特点、腐蚀性；探讨了湿法脱硫火电厂烟囱的选型原则；重点讨论了钢烟囱的防腐设计，并对内衬的选型提出了建议。     

嘉华电厂不设GGH湿法脱硫烟囱防腐改造探讨

对嘉华电厂不设GGH的湿法脱硫烟囱防腐技术方案进行了探讨.从嘉华电厂的烟囱及其运行特征入手,根据防腐要求提出各种可选方案;通过对方案特性的对比分析,得到最优方案.     

燃煤电厂脱硫烟囱防腐技术创新和应用探讨

通过对现行燃煤电厂脱硫烟囱防腐技术分析,总结了脱硫烟囱防腐失效的原因,提出了脱硫烟囱防腐的技术创新思路。简要介绍了采用自硫化丁基橡胶防腐衬里对燃煤电厂脱硫烟囱进行防腐的可行性和成功案例。     

热喷涂防腐涂层在生物质锅炉中的研究进展

简要介绍了常用热喷涂技术,基于对热喷涂防腐涂层在燃煤锅炉防腐工作中的研究进展,进一步分析了热喷涂涂层在生物质锅炉防腐中的现状,介绍了金属涂层中的NiCrTiFe系列涂层、陶瓷涂层及金属陶瓷复合涂层、纳米涂层等现有技术比较成熟的涂层,对热喷涂防腐涂层的发展趋势进行了展望。     

动态泡沫床处理含氟尾气的研究

本文针对目前国内外普钙含氟尾气处理工艺流程长、能耗大、单塔脱氟效率低等弊病,而研制出动态泡沫床净化器。简介了该净化器的构造、设计、脱氟机理和设备防腐,并介绍了本工艺的特点及应用前景。     

烟气脱硫改造工程中的老烟囱防腐措施

湿法脱硫后的烟气含水量大，湿度高，烟气各项性能指标发生了变化，致使烟气具有强腐蚀性，从而带来了老烟囱如何防腐的问题。目前国内还缺乏老烟囱防腐改造经验，主要借鉴国外技术和经验。对玻璃鳞片胶泥衬里防腐、进口砖板衬里防腐、整体面层防腐3种方案进行了比较，结果表明：整体面层体系是老烟囱防腐改造较理想的措施。     

泡沫灭火剂环保性能评价及研究进展

泡沫灭火剂主要用于扑灭液体燃料火灾,是一类成分复杂的化学品。针对泡沫灭火剂的环境污染风险、国家标准《泡沫灭火剂》(GB 15308—2006)与《A类泡沫灭火剂》(GB 27897—2011)无环保性能指标等问题,介绍了各类泡沫灭火剂的环境污染风险,综述了国内外泡沫灭火剂环保性能评价方法的研究进展,对比了中国、美国、欧盟现行泡沫灭火剂标准中的环保性能评价指标与方法,指出:我国可采用生物毒性、BOD₅/TOC、总有机氟含量等作为泡沫灭火剂环保性能的评价指标。     

火电厂湿法脱硫系统中pH计及密度计的设计应用

针对火电厂湿法烟气脱硫系统中传统pH计及密度计的探头结垢磨损及测量管路堵塞频繁,导致pH和密度的测量出现偏差甚至数据失真这一问题,结合山西大土河焦化有限责任公司热电一分厂3×75t/h循环流化床锅炉烟气脱硫工程实例,着重介绍了改进型pH计的有效防堵塞安装方法及隔膜压力变送器代替传统密度计的设计原理及应用情况,为今后工程实践提供参考。     

Application of a Second-Order Kinetic Model to a Complex Melt Polymerization Reaction

A novel copolymer system has been synthesized using methyl hydroquinone diacetate (MHQDA), 1,4 naphthalene dicarboxylic acid (1,4 NDCA), and polybutylene terephthalate (PBT) using the melt polymerization technique. The optimum kinetic parameters pertinent to this system are reported in this study. A simple second-order reaction sequence summarizes catalyzed and uncatalyzed reactions between MHQDA, 1,4 NDCA, and PBT. The kinetic parameters for the copolymerization reaction were determined using a new second-order model. This technique was used to compute the moles of acetic acid generated in the polymerization process. The model was compared to that of the experimentally determined data. Close comparison (percentage error of less than 5%) was obtained between the experimental and theoretical data. The kinetic data support block copolyester formation. The thermal data also supports formation of block polymers.     

Use of wastes derived from earthquakes for the production of concrete masonry partition wall blocks

Utilization of construction and demolition (C&D) wastes as recycled aggregates in the production of concrete and concrete products have attracted much attention in recent years. However, the presence of large quantities of crushed clay brick in some the C&D waste streams (e.g. waste derived collapsed masonry buildings after an earthquake) renders the recycled aggregates unsuitable for high grade use. One possibility is to make use of the low grade recycled aggregates for concrete block production. In this paper, we report the results of a comprehensive study to assess the feasibility of using crushed clay brick as coarse and fine aggregates in concrete masonry block production. The effects of the content of crushed coarse and fine clay brick aggregates (CBA) on the mechanical properties of non-structural concrete block were quantified. From the experimental test results, it was observed that incorporating the crushed clay brick aggregates had a significant influence on the properties of blocks. The hardened density and drying shrinkage of the block specimens decreased with an increase in CBA content. The use of CBA increased the water absorption of block specimens. The results suggested that the amount of crushed clay brick to be used in concrete masonry blocks should be controlled at less than 25% (coarse aggregate) and within 50-75% for fine aggregates.     

脱硫湿式球磨机堵磨原因分析及处理

湿磨系统在湿法脱硫中应用非常广泛,但也存在不少问题。分析了湿式球磨机运行电流下降、系统堵塞等堵磨现象产生的原因,探讨了湿磨系统堵磨后的处理方法。采取针对性的检修及运行措施,形成一套完整的方案,可以预防湿式球磨机堵磨事件发生,为湿式球磨机堵磨处理及预防提供了参考。     

Biodegradable water-soluble polycarboxylic acid design: Biodegradability and builder performance in detergent formulation of partially dicarboxylated polyuronide containing sugar residues in the backbone

Partially dicarboxylated polyuronide having a variable amount of unreacted sugar blocks as an enzymatically cleavable segment was prepared by the controlled oxidation of pectic acid and alginic acid. It was found that partially dicarboxylated polyuronides containing uronide blocks showed better biodegradability than those having no uronide block in the polycarboxylate chain. The rate of biodegradation varies according to the degree of dicarboxylation. It was confirmed that dicarboxy polyuronides containing more than 70% unreacted uronide residues tended to biodegrade quickly. The biodegradability obtained by the BOD test and the enzymatic degradability are well correlated, suggesting that these polymers are first cleaved at the sugar blocks by carbohydrase with subsequent assimilation of the resultant oligomeric fractions. Detergency was dependent on the content of the carboxylate groups in the polymer. The polymers with high carboxylate contents showed better builder performance. The detergency of dicarboxy pectic acid was better than that of dicarboxy alginic acid when compared on the basis of an equal degree of dicarboxylation.     

江苏省火电机组节能减排在线监测系统的开发及应用

阐述了江苏省火电机组节能减排在线监测系统的监测模型、系统架构及应用功能开发情况,分析了系统的特点及其推广应用情况。该系统以实现多种类型火电机组节能减排监管业务数据的实时在线监测为目标．基于电力调度数据网络,利用J2EE分布式多层系统应用架构技术,依据MVC模式的设计思路进行技术的选型及应用的开发,包括机组状态实时监控、统计分析等功能,已在全省270余家电厂应用,保障了脱硫（硝）电价等节能减排政策落到实处。     

Conceptual Site Model Development and Phased Remedy Implementation to Achieve Vapor Screening Goals at a Former Dry Cleaner

Tetrachloroethene (PCE) releases at a former dry cleaner resulted in impacts to soil and shallow groundwater beneath and adjacent to the building. Subsurface impacts led to vapor intrusion with PCE concentrations between 900 and 1,200 micrograms per cubic meter (μg/m³) in indoor air. The migration pathways of impacted soil vapor were evaluated through implementation of a helium tracer test and vapor sampling of an exterior concrete block wall. Results confirmed that the concrete block wall acted as a conduit for vapor intrusion into the building. A combination of remediation efforts focused on mass reduction in the source area as well as mitigation efforts to inhibit vapor migration into the building. Excavation of soils beneath the floor slab and installation of a spray‐applied vapor barrier resulted in PCE concentrations in indoor air decreasing by over 97.9 percent. Operation of an active ventilation system installed under the floor slab and groundwater remediation via injections of nano‐scale zero valent iron (nZVI) further reduced PCE concentrations in indoor air by over 99.8 percent compared to baseline conditions. While significant reductions of PCE concentrations in groundwater were observed within two months after injection, maximum reductions to PCE concentrations in indoor air were not observed for an additional 12 months. © 2014 Wiley Periodicals, Inc.     

Novel malonate-type copolymers containing vinyl alcohol blocks as biodegradable segments and their builder performance in detergent formulations

Poly[(disodium methylene malonate)-co-(vinyl alcohol)] [P(DSMM-VA)] and poly[(disodium ethoxymethylene malonate)-co-(vinyl alcohol)] [P(DSEMM-VA)] containing a poly(vinyl alcohol) (PVA) block as a biodegradable segment were prepared and their biodegradability and functionality were evaluated and compared with those of the corresponding fumarate and maleate copolymers. It was found that the 1,1-dicarboxylate-type copolymers, P(DSMM-VA) and P(DSEMM-VA), showed better biodegradability than the corresponding 1,2-dicarboxylate-type copolymers, P(DSF-VA) and P(DSM-VA). This improved biodegradability of P(DSMM-VA) and P(DSEMM-VA) is probably attributable to their more expanded polymer chain in aqueous solution, which will be more accessible to the degrading enzymes. The minimum chain length of the PVA-block, which acts as a biodegradable segment in the polymer chain, is estimated to be 2–3 and 3–4 monomer units for P(DSMM-VA) and P(DSEMM-VA), respectively. On the other hand, the minimum PVA block is about 5 and 7 monomer units for the fumarate and maleate copolymers, respectively. It was confirmed that P(DSMM-VA) showed excellent builder performance compared to the corresponding fumarate copolymer.Paper presented at the Bio/Environmentally Degradable Polymer Society—Second National Meeting, August 19–21, 1993, Chicago, Illinois.     

Synthesis of Polylactide-b-Poly (Dimethyl Siloxane) Block Copolymers and Their Blends with Pure Polylactide

The synthesis of polylactide (PLA)-b-poly (dimethyl siloxane) (PDMS) linear block copolymers and their use in blends with pure-PLA are described. PLA-b-PDMS linear block copolymers were obtained by the transesterification reaction in chloroform solution between poly(dimethyl siloxane) bis (2-aminopropyl ether) (molecular weight 2,000?Da) with PLA in the presence of stannous octoate. Molecular weights (Mw) of the block copolymers were varied from 53,800 to 63,600?Da while that of pristine PLA was 73,600?Da. The copolymers obtained were purified by fractional precipitation and then characterized by ¹H NMR, FTIR, GPC, viscometry and DSC techniques. Blends of pure PLA with PLA-b-PDMS block copolymers displayed improved elastic properties (elongation up to 140%) compared to pure PLA (elongation ~9%). Thermal, mechanical and morphological characterization of the blends were also conducted.     

湿法烟气脱硫液气比的影响因素及参数确定

分析了湿法烟气脱硫系统中液气比的影响因素及参数确定,在脱硫系统设计阶段,确定合理的液气比可以提高脱硫效率,降低系统电耗。