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对废弃混凝土的再生利用及其必要性进行介绍,通过对废弃混凝土再生利用中存在的问题进行分析,探讨国内外对废弃混凝土再生利用技术的研究现状,讨论废弃混凝土再生利用的有效应用。提出要加强对废弃混凝土再生利用的研究,充分发挥废弃混凝土再生利用技术的作用,提高资源利用率,实现节能目标,从而为我国建筑工程行业的发展提供更高的经济效益,提升其社会效益。 相似文献
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袋类除尘器是燃煤电厂主要的配套除尘设备,其配套装机容量约占全国燃煤机组容量的30%。滤袋作为袋类除尘器的核心部件,每隔数年需更换,维护成本较高。如果更换下来的废弃滤袋能够回收利用,可为电厂节省成本。本文主要介绍目前燃煤电厂常用的滤袋材质的回收利用方法。 相似文献
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从技术和经济两个角度分析了再生混凝土开发和利用的可行性,以促进建筑废料的再生利用及技术研究。分析表明,再生骨料的应用具有很好的经济效益和社会效益。 相似文献
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废塑料合理再生利用的探讨 总被引:3,自引:1,他引:2
废塑料处理不当,不仅浪费资料,且造成白色污染。为贯彻可持续发展方针,亟待探索废塑料合理再生利用的途径。文章在介绍德国和日本经验的基础上,提出了对我国废塑料合理再生利用的建议。 相似文献
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近年来,城市规模不断扩大,各地都出现了大批新兴建筑,建筑施工垃圾也不断增加。然而,建筑垃圾并非毫无用处,而随意的废弃一方面很容易造成资源浪费,同时,也不利于生产活动的可持续发展。从绿色建筑以及建筑节能的角度出发,阐述了再生砌块以及再生混凝土的施工技术,并对再生混凝土运用于绿色建筑的科学性进行了论证。以某地绿色建筑建设项目为例,简要陈述绿色建筑中运用再生混凝土和再生砌块应用过程以及施工过程中值得关注的问题。 相似文献
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对硅碳素(ANJ.SIC)的再生及再生后去除水中Mn^2+的效果进行试验研究。试验表明,用NaOH再生后的硅碳素(ANJ.SIC)与再生前相比,出水Mn^2+浓度达到0.1mg/L以下的时间有所延长。当原水Mn^2+浓度范围为2.162~2.24mg/L、流速为10.4m/h时,再生后硅碳素(ANJ.SIC)出水Mn^2+浓度在0.1mg/L以下的时间比再生前延长了近1倍。对再生率进行了试验研究,得出再生次数与再生率的关系。试验表明,用NaOH再生后再生率在第二次时能达到182.3%,平均再生率为170%。对再生机理进行了深入的分析研究; 相似文献
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在一台非道路国四高压共轨柴油机上,利用试验台架研究颗粒捕集器(diesel particulate filter,DPF)驻车再生过程中不同排气热管理策略对氧化型催化器(diesel oxidation catalyst,DOC)入口温度及排放的影响。结果表明,合适的再生转速、节气门关闭角度及喷油参数对提升DOC入口温度、降低DOC入口未燃HC效果显著。研究结果可以对柴油机DPF驻车再生排气热管理策略的制定和优化提供指导。 相似文献
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韩辉 《电网与水力发电进展》2003,19(1):29-32
三峡永久船闸工程施工中,部分混凝土外观存在有蜂窝、麻面、错台等质量缺陷,由于永久船闸运行时水位变化频繁,输水洞水流流速大,对混凝土外观质量要求非常高,由此采用多种材料对混凝土缺陷进行了处理,现已全部完成。经检查,处理后混凝土质量满足设计要求。 相似文献
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This article presents a research study on the process analysis of adiabatic liquid desiccant dehumidification/regeneration with slug flow assumptions. A controlling equation is developed for the quasi-equilibrium processes where the two fluid streams are in contact in quasi-equilibrium conditions. Results from this equation with numerical integration for the solution are presented as process curves on a psychrometric chart. Two of these curves are found to be characteristic of two typical types of adiabatic dehumidification/regeneration processes: one featured with small enthalpy change of air and low mass flow of solution (type-1) and the other with small concentration change and high mass flow of solution (type-2). These two types of process curves are thus named as characteristic process curves. Numerical simulations of one-dimensional heat and mass transfer model under practical conditions were also performed. With special inlet conditions and approximately balanced heat and mass capacity conditions, the loci of states for the two fluid streams will still proceed approximately along the same characteristic process curves. Under other inlet conditions, the characteristic process curves still function as asymptotic limits for the real processes. Thus, the research presented in this article provides an in-depth understanding of the complicated heat and mass transfer processes and also a theoretical basis for further development of simplified and precise enough algorithm of heat and mass transfer calculations. 相似文献
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Steady-state experimental study of a closed recycle solar still with enhanced falling film evaporation and regeneration 总被引:1,自引:0,他引:1
An active regenerative solar still with an area of 1.03 m2, enabling one to reuse the latent heat of condensation and sensible heat of brine, is constructed and tested indoors, using a solar simulator for irradiation. In this still, a considerable fraction of the latent and sensible heat is successfully recycled and utilized for preheating the feedstock and recycling air via a falling film evaporator–condenser. The forced thin layer evaporation and film condensation, which are the efficient enhanced processes for heat transfer, are applied in this unit. As a result, the performance ratio of the unit is about two to three times greater than that of a conventional basin-type solar still (single-effect). 相似文献
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以在电站烟气实际运行中失活的催化剂为原料,通过去离子水水洗、硫酸酸洗、钒钨等活性物质重新负载等方法,开发了一套廉价有效的再生工艺,并通过ICP-OES、SEM、XRD等表征研究了每一步处理方法对催化剂结构和性能的影响。研究表明,经过完整再生工艺处理后失活催化剂脱硝活性在300~400℃温度窗口内提升30%以上,水洗过程能够去除大部分硫、钙等中毒元素,而酸洗经过硫酸化过程后增加催化活性中心的数量和酸性,从而提高催化剂脱硝活性,XRD表明再生后V2O5或WO3仍然以无定形态或高分散的形态分布在载体表面上。 相似文献
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Numerical simulation has been conducted for the desiccant wheel, which is the crucial component of a desiccant cooling system. The mathematical model has been validated by comparing with previous experimental data and numerical results. The calculation results are in reasonable agreement with both, experimental and numerical results. As the key operating/design parameters, the wheel speed and the area ratio of regeneration to dehumidification have been examined for a range of regeneration temperatures from 60 °C to 150 °C. Optimization of these parameters is conducted based on the wheel performance evaluated by means of its moisture removal capacity (MRC) which is more appropriate than effectiveness as a performance index of unbalanced flows. Also the effects of the outdoor air temperature and humidity on the optimum design parameters are examined. 相似文献