蒸压加气混凝土制品热耗和节能途径分析

从蒸压热平衡角度分析了B05级蒸压加气混凝土制品生产线的热耗和节能途径。结果表明,干密度每相差100 kg/m~3,能耗相差16.5 kg蒸汽热能;坯体水料比每差1%,蒸汽能耗相差约1 kg/m~3;与进釜坯体温度80℃相比,进釜坯体温度50℃,需多加蒸汽23 kg/m~3,进釜坯体温度30℃,需多加蒸汽38 kg/m~3;与蒸压釜初始温度70℃相比,冷釜升温(设20℃)需增加蒸汽量11.33 kg/m~3,蒸压釜初始温度40℃,蒸压釜升温需要增加蒸汽量6.8 kg/m~3;蒸压釜矿棉保护层厚度为200 mm和100 mm比较,蒸压釜散热损失使每m~3制品减少约2 kg/m~3;尾气排放热能相当于29.25 kg/m~3蒸汽热能;每m~3制品产生冷凝水热能为29.5 kg/m~3蒸汽热能。     

微波蒸压技术快速养护加气混凝土砌块试验研究

为了加速养护加气混凝土砌块,将微波技术应用到传统的蒸压养护工艺中,设计和制作了小型微波蒸压釜,并采用试验釜开展了一系列的试验研究。研究结果表明,当微波加热时间在20min,恒温时间4~4.5h,恒温温度180~190℃,降温时间1h,加气混凝土强度满足出釜强度3.0MPa、密度等级683~813kg/m3的质量控制要求。     

塔里木油田三甘醇脱水装置参数优化研究

文章通过三甘醇脱水工艺的第三套三甘醇注醇量调整,第三套再生温度的调节、汽提气注入量调整、贫液进塔温度调整运行参数的优化,得出：当三甘醇脱水工艺循环量在3840 kg/h左右时,再生效果最好,贫液浓度最高,所获得的干气水露点最低;三甘醇脱水工艺再生温度在190～200℃之间温度越高,再生效果越好;三甘醇脱水工艺再生装置在汽提气量30 Nm3/h左右时,再生效果最好,贫液浓度最高,所获得的干气水露点最低。     

我国第一台35MW KB-P型热水锅炉在新疆石河子市热力公司顺利投产

新疆石河子市热力公司所属26号供热站,承担该市四个小区19万m~2面积的采暖供热.原有一台15t/h热水锅炉和一台10t/h蒸汽锅炉的供热能力不足,95年初经考查后决定利用原有厂房进行扩建安装一台体积小,功率大的由长春锅炉厂和俄多罗戈布什锅炉股份公司合作生产的带有风力机械式抛煤机倒转炉排强制循环的KB—P—35—150型高温热水锅炉.该炉额定热功率为35MW,设计最大工作压力2.5MPa,进水温度70℃,供水温度150℃,通水量370t/h,锅炉总重77t.中俄合作生产的锅炉,锅炉本体受热面部分由俄方制造供货,锅炉钢结构炉排抛煤机部份由长春锅炉厂及其协作厂家制造供货.     

利用金矿尾矿生产加气混凝土的试验研究

研究利用金矿尾矿制作加气混凝土.尾矿加气混凝土的最佳配比为:尾矿63%、石灰25%、水泥10%、石膏2%,外加剂最佳掺量为40 g/m3,最佳水料比为0.58;尾矿最佳细度为200目筛余1.75%;最佳蒸压制度为:升温时间3 h,恒温时间8 h,最高蒸压温度205℃,降温时间2.5 h.所制备出的尾矿加气混凝土平均密度为697.8 kg/m3,平均出釜抗压强度为6.32 MPa,符合A5.0、B07级加气混凝土合格品的要求.     

水蒸汽加热法富油脱苯模拟计算

一、前 言 我国煤气厂富油脱苯大多数为水蒸汽加热蒸馏法。该法富油经加热器加热到135～145℃后自塔顶部进入塔内,直接蒸汽经由再生器进入塔底,属于汽提塔类型,是个较为陈旧的富油脱苯工艺。由于没有再沸器供热,蒸馏温度与分离效果完全由直汽用量和富油进料温度决定。 本文用宽沸程物系蒸馏常用的流量加合法,进行水蒸汽提馏脱苯的模拟计算。计算结果对于蒸馏过程分析,以及操作的改进有参考作用。     

硅藻土/活性炭对石油降解菌群的固定化研究

研究了一种石油降解菌群的固定化方法,其中菌群包括假单胞菌、芽孢杆菌和微球菌。以硅藻土/活性炭作为降解菌群的固定化载体,对最佳固定化条件进行研究,结果表明：降解菌群的最佳固定化时间16 h,温度37℃,硅藻土/活性炭加入量0.1 g/mL,pH值7.5,120 r/min振荡16 h,降解菌群固定化率达97.1％。固定化菌群用于油基钻屑中油降解,降解14 d,可使钻屑中TPH含量由30 000 mg/kg降至10 450 mg/kg,平均油去除率达65％。     

溶剂再生新型釜式再沸器的工艺校核与性能评价

以沧州炼油厂尾气脱硫溶剂再生装置新型釜式再沸器为例,利用Aspen B-JAC对釜式再沸器工艺校核的要点进行了阐述,为釜式再沸器的设计和校核提供了新的参考,并对该换热器的防腐、节能、环保、提高产品质量等方面的优越性进行了评价。     

横流冷却塔改造成逆流冷却塔在实际工程的应用

对横流冷却塔改造成逆流冷却塔的可行性进行了分析,并介绍了将横流塔改造成逆流塔的主要方案和实施内容。通过改造,成功地将单塔水处理量由2 500 m3/h提高到3 400 m3/h,大幅提升了36%,解决了老循环水厂因占地面积的制约而无法提升处理能力的问题。     

上海天然气处理厂C_3回收工艺优化研究

利用HYSYS模拟软件对上海天然气处理厂C3回收工艺进行优化。在不同压力下考察了B物流去冷箱比例、脱甲烷塔塔底再沸器热负荷、丙烷制冷负荷对C3收率及能耗的影响,优化了工艺条件。结果表明,在进气温度为20℃、处理量为100×104 m3/d的工况下,压力为4 500kPa时,应关闭B物流旁通,降低脱甲烷塔再沸器热负荷至125.98kW。此时,C3收率可提高至97.4%左右;压力为4 000kPa时,B物流旁通应全部关闭,适宜的脱甲烷塔再沸器的热负荷为61kW。此时,C3收率为90.2%左右;当压力降至3 600kPa时,B物流旁通应全部关闭,适宜的脱甲烷塔再沸器的热负荷为55kW,丙烷机制冷负荷为33%。此时,系统C3收率可达到81.56%左右。     

污泥制砖存在问题浅析

污泥制砖符合国家的环保政策,但在技术方面还待进一步创新和突破。为此分析了污泥制砖在技术方面、环保方面和社会大众认可方面存在问题及相应的改进措施。     

干旱区绿洲环境下的新疆小城镇建设投资

一、研究区域基本现状新疆地处欧亚大陆腹地,地貌轮廓表现为“三山夹两盆”,山地与平原的面积大致各占50%,镶嵌于戈壁沙漠的绿洲仅有7万平方公里。新疆土地面积166.49万平方公里,占全国总面积的六分之一。气候干旱,荒漠广布,是中国最大的干旱区,是亚洲干旱核心区,也是世界上著名的干旱区之一。水资源短缺,生态极度脆弱。新疆2004年底有1950万人,人均GDP已经超过了1000美元,城镇化进入了快速发展阶段,特别是小城镇的发展速度较快。但新疆特殊的干旱区绿洲环境,使得小城镇的发展存在许多问题。一是城镇规模小而散,基础设施配套差,城镇集散和…     

Levels of manganese in the urine of female farmers in non-polluted regions in Japan

Nearly 1500 urine samples were collected from female farmers in eight regions widely scattered in the islands of Japan in the winter of 1987-1988. The samples were analysed for manganese by wet ashing and flameless atomic absorption spectrophotometry under strict quality control. The values observed after adjustment for a specific gravity of 1.016 were distributed log-normally with a geometric mean of 0.65 microgram/l and a geometric standard deviation of 2.47. There was no effect of aging or any effect of smoking on the urinary manganese concentration. The inter-regional difference may be present but not yet conclusive. As no sex difference was observed in a previous study, it may be possible to deduce that the value may possibly stand for the "background" level of both men and women, either smoking or non-smoking, among the general Japanese population. The observed value is discussed in comparison with values reported in the literature.     

Typification of Fires in Buildings in Spain

Although the Dirección de General de Protección Civil (DGPC), an agency of the Spanish government, has been responsible for the collection of data and the statistical analysis of fires since 1985, it has not as yet issued any reports. It is true that a couple of studies have been made, but in neither case did they use a standardized methodology but relied simply on the heterogeneous information provided by the fire brigades which cooperated in the studies. At that time Spanish fire brigades did not have special units for professional fire investigation, nor was the information derived from standardized methodologies suited to research purposes. In addition, information was extremely scarce and basic, focussed only on the fire, the use of the building and personal data of the victims. In this context, the project for a Fire Investigation Unit in the Fire Brigade of Málaga (the sixth largest Spanish province in inhabitants) was set up. Although inspired in the methodologies used in the USA and in the UK, the aim was to create a customized methodology for the first scientific investigation of fires in Spain. Our research was conducted in 2007. Using the methodologies of the USA and the UK, our own methodological approach and the Spanish regulations, we drew up a questionnaire with 110 variables arranged into 6 modules. We studied 96 fires out of the 154 emergency fire calls received in 2007, having omitted some emergency calls for various reasons. Our results revealed that it was necessary to generalize the installation of fire extinguishers in residential buildings, to train the general public in the use of these devices, to promote the use of fire and smoke detectors in residential buildings, to encourage the inspection and control of old electric installations and to monitor the new installations, to generalize the implementation of emergency and evacuation plans and to design new systems and materials for the cabinets where hand-held extinguishers are stored.     

分光光度法测水中余氯

介绍了用双硫腙分光光度法测定水中余氯的新方法，阐述了其测定试验过程，根据试验结果显示，其结论符合国家标准，表明该方法可用于自来水等样品中余氯含量的测定，结果比较准确。     

Intersections of inequality in homeownership in Sweden

Abstract

Inequalities relating to ownership of housing have become a major issue de jour in many Western societies. This article examines how the distribution of homeownership in Sweden relates to two factors widely seen as significant to such inequalities, namely parental tenure status and place of birth. We use longitudinal registry data to examine the bearing of these two factors on individual-level tenure progression since the beginning of the 1990s for persons at different stages of their housing careers. We extend existing understandings of Swedish homeownership patterns by demonstrating that inequalities relating to place of birth and parental tenure intersect with one another in ways that substantially advantage certain subgroups while disadvantaging others, and by demonstrating that experiences of entry into homeownership have in recent years been changing in markedly different ways for these different subgroups. Overall, Swedish homeownership inequalities, far from dissipating, appear to be hardening along existing lines.     

莳花在城市绿化中的应用

目的:花化、香化、彩化已成为城市园林绿化的主要趋势,也是为满足人们对环境要求越来越高的一种心境。方法:选择采用莳花能表现出品种繁多,色彩艳丽等不同的方式,从而能在很大程度上丰富了植物造景的层次感要求。结果:能使其达到美化环境、增添节日气氛、提高绿化品质等方面有着突出的作用。结论:莳花造景对城市的美化可达到立杆见影效果,从而提高城市的形象和品位。     

日本城市浅层地下空间利用的新成就

本文结合日本川崎市站前广场和神户市哈巴兰德地区的立体化再开发，分析介绍当前日本浅层地下空间开发利用的成就和特点。     

遗传算法在边坡稳定系数计算中的应用

边坡稳定性的关键问题是确定最危险滑动面(潜在最危险滑动面)和边坡的稳定系数。国内外一般是采用先假定边坡滑移模式,然后近似确定最危险滑动面,再求近似的边坡稳定系数的方法来分析边坡的稳定性,但假设的边坡滑移模式难以反映边坡滑移的实际状态。因此本文探索利用遗传算法搜索最危险滑动面,并得到最小稳定系数及对应的最危险滑动面曲线,取得了较好的效果。     

地质情况复杂地区高速公路隧道地质预报研究

针对地质情况复杂地区垫邻高速公路设计、施工中的具体问题，从地质预报的方法、原理方面入手，对地质情况复杂地区高速公路隧道施工中的地质超前预报工作进行了深入的研究，在分析归纳的基础上，提出合适的工作方法。