共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
3.
4.
《Planning》2013,(5):24-25
结合矿区电梯的现状,从电梯能量转化状态说明电梯的主要能量损耗,并简要分析了当前矿区电梯能量损耗状况。介绍了一种新型的电梯节能装置——能量回馈系统,并通过其工作原理与特点进行分析,讨论其推广的可行性。结合研究数据,预算能量回馈系统在矿区推广的效益,从而阐述了电梯能量回馈系统在矿区推广的重要意义。 相似文献
5.
分析了当前我国电梯节能情况,介绍了一种新型的电梯节能装置——有源能量回馈器。结合实验研究,从理论上进行深入研究,得出该装置的理论电气原理;结合特种设备检验检测,总结出有源回馈的特点;通过实验对比测试,证明有源能量回馈具有的良好节能效果。 相似文献
6.
7.
8.
能量回馈控制技术在电梯节能中的应用 总被引:2,自引:0,他引:2
介绍了变频调速能量回馈控制技术的发展、通用变频器能量回馈PWM控制系统和正弦波脉宽调制双PWM控制技术,讨论了能量回馈控制技术在电梯上应用的节能原理,分析了电梯采用能量回馈技术的社会经济效益,从而提出我国电梯总量大、节能空间大的观点。 相似文献
9.
电梯作为一种交通工具越来越频繁的出现在我们的日常生活中。随着社会的发展,电梯的技术也在不断的发展,特别是在节能方面,现在的永磁同步无齿轮电梯比以前的电梯有了很大的进步,尤其是有能量回馈的永磁同步无齿轮电梯,其节能效果相当明显。据统计,同步无齿轮有能量回馈电梯比同参数的蜗轮蜗杆无能量回馈电梯有大幅度节能,平均节电率约为45%。近年来,同步无齿轮有能量回馈电梯的技术不断完善, 相似文献
10.
2007年10月颁布的《中华人民共和国节约能源法》规定:“对高耗能的特种设备,按照国务院的规定,实行节能审查和监管”,这在电梯行业引起关注和响应。PWM逆变方式的能量回馈制动(Energy Regenerative Braking)装置(以下简称ERB装置)具有以下特点:曩可直接驳接在目前电梯大量使用的交一直一交变频器的制动端子上,直接替代原电阻制动单元,实现能量回馈制动运行,工艺路线简单。 相似文献
11.
12.
Over the past twenty or so years, the focus of urban regeneration in the UK has changed from being based on outcomes that primarily involved property redevelopment – by either the public or private sectors – to a broader mix of issues and a far greater emphasis on the process of urban regeneration and the partnership ideal. The evaluation undertaken here takes a critical stance towards the ways in which the partnership principle has been adopted and the policy guidance that requires it as a near-compulsory model. It is argued that, to date, there is little interest in the managerial effectiveness of partnerships and the broader implications of this for regeneration policy. A survey of the contemporary regeneration literature is undertaken to highlight the partial and inconclusive nature of most existing evaluations of partnerships, particularly given the emphasis on the role of local community leaders in the formulation and implementation of partnership projects. Then, some wider issues of the ‘political economy’ of urban policy are considered in the context of the partnership approach. This is followed by a juxtaposition of trends in property development in general with urban regeneration partnership management processes. Finally, it is concluded that the partnership ideal is a useful policy device but that it has to be thought through more clearly and applied in specific contexts, rather than seen as the best and universally applicable model of urban regeneration. 相似文献
13.
为提高污水厂出水水质,寻求适合处理污水厂尾水滤膜的再生方法,采用超滤—纳滤双膜工艺,针对辽宁省本溪市某城市污水厂二级尾水开展深度处理研究。考察了进水流速、累积过滤水量(超滤进水流速为25 L/min,纳滤进水流速为4 L/min)对膜分离效果的影响,同时开展了超滤和纳滤膜再生方式及效果研究。结果表明:在考察范围内,超滤装置的分离性能受进水流速影响较小,主要与进水污染程度有关,对COD、TP、氨氮的平均去除率分别为48%、55%、27%。当纳滤单元进水流速为4 L/min时,双膜法对COD、TP、氨氮的平均去除率分别为87%、96%、68%。双膜法对COD、TP的去除率随着进水污染程度的减轻而降低,氨氮去除率受累积过滤水量的影响较小,这与原水污染程度有关。随着累积过滤水量的增加,膜分离性能呈减弱趋势。超滤膜轻微污染时采用物理清洗效果良好,严重污染时需采用化学清洗的方法。超滤有效延缓了纳滤膜污染,纳滤膜轻微污染时采用酸碱浸泡法再生效果良好。 相似文献
14.
沸石去除地下水中氨氮及其再生试验研究 总被引:2,自引:0,他引:2
采用沸石柱直接过滤氨氮超标地下水,考察了滤速和原水氨氮浓度对沸石柱运行效果的影响及再生流速和再生方式对再生效果的影响,以探求简单、经济、可行的去除地下水中氨氮的工艺。结果表明,滤速越低、进水氨氮浓度越小,则沸石柱的有效运行时间越长,累计合格产水量越大;再生流速对再生效果有较大影响,再生流速为10m/h时的综合再生效果最佳;逆流再生的效果略好于顺流再生的,但差异不大;沸石具有较好的重复利用性能。 相似文献
15.
The effectiveness of on-site thermal regeneration of field-spent granular activated carbon (GAC) from two municipal drinking water facilities was compared with bench-scale electrochemical regeneration, a novel regeneration technology. The regeneration method was evaluated using aqueous natural organic material (NOM) adsorption, iodine number analysis, and surface area analysis. In contrast to the large electrochemical regeneration efficiencies reported in the literature for GAC loaded with phenolics and other individual organic compounds, the electrochemical reactor tested was only able to regenerate 8-15% of the NOM adsorption capacity of the field spent GAC. In contrast, thermal reactivation achieved up to 103% regeneration efficiency. To more accurately assess the efficiency of regeneration processes for water treatment applications, GAC should be loaded in continuous-flow columns and not batch rectors. The iodine number analysis yielded higher efficiency values, however it did not give an accurate estimate of the regeneration efficiency. The small changes in GAC pore size distribution were consistent with the low electrochemical regeneration efficiencies. These low efficiencies appear to be related to the low reversibility of NOM adsorption and to pH-induced adsorbate desorption being the primary mechanism for this type of electrochemical regeneration system. 相似文献
16.
1949-2019年中国城市更新的发展与回顾 总被引:1,自引:0,他引:1
《城市规划》2020,(2)
城市更新一直是国际城市规划学术界关注的重要课题。中国城市更新自1949年发展至今,内涵日益丰富,外延不断拓展,对其70年发展历程的回顾,有助于理解中国城市更新特定的诞生逻辑、阶段问题与经验教训。根据我国城镇化进程和城市建设宏观政策变化,将中国城市更新分为相应的4个重要发展阶段。并且,对每一个阶段城市更新的政策背景、代表性案例、更新思想、学术活动以及更新制度建设进行总结分析,归纳中国城市更新的阶段性特征。最后,在历史演化与经验总结的基础上,提出中国城市更新应倡导多元价值观、多元更新模式、多学科交叉与合作、多元主体参与和共同治理的方向转型。未来,建设科学化、系统化和制度化的城市更新体系,将成为规划工作的重点内容。 相似文献
17.
18.
19.
Liquid desiccant regeneration has important effect on performance of a liquid desiccant air conditioning system. Compared with conventional packed regenerator, internally heated regenerator is proposed to achieve better regeneration performance. This study emphasized on both regeneration rate and regeneration thermal efficiency to evaluate the performance of both regenerators. A validated heat and mass transfer model was used to analyse and compare the performance of internally heated and adiabatic regenerators. The results indicated that internally heated regenerator not only could increase the regenerate rate, but also could exhibit higher energy utilization efficiency. Different from adiabatic regenerator, internally heated regenerator can provide comparable regeneration efficiency and regeneration rate at low desiccant flow rate, so it should be a good alternative to avoid carryover of desiccant droplets. Higher air flow rate would result in a deduction of regeneration thermal efficiency although achieving higher regeneration rate. Suitable flow rate of the air should be considered carefully in liquid desiccant regeneration. The internally regenerator could have considerable prospect in liquid desiccant air conditioning application. 相似文献
20.
就目前我国沥青再生技术的研究现状做了概述,分析了旧沥青路面再生机理,并对沥青路面再生技术的方法,现场冷、热再生技术的施工工艺进行了阐述,以推动我国在再生技术上的发展。 相似文献