Runoff infiltration to permeable paving in clogged conditions

The effect of varying runoff on a clogged permeable surface was analysed using a specifically designed laboratory rig consisting of a variable gradient testing frame, a rain simulator and water collecting chambers. The results indicate that the apparatus can be used successfully to test the runoff resistance of concrete blocks in permeable surfaces. The results indicate that a surface at 2% gradient that is clogged with crushed construction debris still permits significant levels of infiltration.     

多孔介质分形特征对回灌渗透性能的影响

为掌握孔隙介质级配和均匀性对水源热泵回灌过程中堵塞的影响,通过室内回灌试验测定了不同级配试样回灌渗透能力,利用颗粒级配分形维数分析了试样级配和不均匀性与回灌渗透性能的相关关系。结果表明级配分形维数D与不均匀系数的对数(lnC u)之间呈负相关,与渗透系数和孔隙度n则呈正相关。从而为不同水文地质条件地区水源热泵工程的适宜性分析,回灌堵塞机理的分析以及防止水源热泵工程堵塞技术的选择提供了一定的科学依据。     

有效疏通受堵蓄热室确保生产正常稳定

根据熔窑蓄热室格子体受堵的现状及其受堵形成机理,以及蓄热室及其格子体砖材的性能特点、耐受温度,对熔窑蓄热室受堵原因进行系统性分析,大胆运用安全简易的疏通工具和方法并不断完善,最终取得了良好的疏通效果并节省了外协费用,在采取有效疏通措施的同时,针对蓄热室受堵的主要因素,严格落实了各项预防措施,使得南北1^#、2^#蓄热室受堵较以往明显减轻,从而确保熔窑的热能高效率、熔化高产能并延长使用寿命。     

全卤制碱盐井运行总结

简要介绍了采卤技术,并对定向水平井连通开采工艺作了较为详细的介绍。对全卤制碱盐井堵井的原因进行了分析,并提出了解决问题的方法。     

鹤煤热电厂气力输灰系统的改进

鹤煤热电厂气力输灰系统在运行中存在经常发生堵管,管道磨损严重,耗气量大等问题。因此,该厂针对输送管道及仓泵布置进行了改进,通过更换磨损弯头,降低输灰速度,基本解决了上述问题,满足了输灰要求,保证了系统运行的稳定性。     

梅钢浸入式水口防止堵塞的机理研究与实践

重点研究了梅钢浸入式水口堵塞来源和堵塞机理。通过扫描电镜、能谱分析等手段对水口中堵塞物进行了分析,发现堵塞物中Al2O3占51.81%,为造成水口堵塞的最主要原因。在此基础上,主要从减少Al2O3生成及阻止夹杂物在水口壁积聚两方面入手,采取了一系列工艺控制和改善措施,使单水口的连浇炉数由改进前的平均6炉提高到了9炉,连铸生产逐步顺行。     

Gradation design of porous asphalt mixture (PAM) for low-strength application in wet environment

Porous asphalt mixture (PAM) is potentially suitable for application in wet environment given its excellent performance in drainage due to the typical open-graded design, whilst ravelling and clogging are the two major issues directly related to the functional service life of PAM pavements. With the increasing up-build of non-motorised transport facility in Singapore which is a tropical country with frequent thunderstorms during monsoon periods, it deserves research into designing well-performing PAM for low-strength pavements such as pedestrian and cycling pathways. In this research, two areas are researched on designing appropriate PAM: firstly, relationship between gradation design and permeability performance is established and 7% content of fine aggregates is selected to achieve adequate coefficient of permeability for Singapore; secondly, four aggregate gradations with different packing structures created by the coarse aggregates were designed, and the performance was evaluated in the aspect of permeability, mechanical strength, resistance to ravelling and resistance to clogging. Three testing scenarios were applied in ravelling and clogging tests, which were unconditioned, ageing-conditioned and moisture-conditioned. It is found that moisture exposure is a more severe condition than ageing on PAM’s performance. On the whole, PAM with high content of intermediate size aggregates (i.e. 6.3–4.75 mm) in the coarse fraction and low content (i.e. lower than 7%) of fine fraction is suggested for low-strength PAM pavement in Singapore.     

滴灌用砂过滤器的过滤与反冲洗性能试验研究

通过试验和分析，本文对节水灌溉工程中使用的砂过滤器的过滤与反冲洗性能进行了研究，提出了新的过滤阻力与雷诺数的关系式，给出了计算初始水头损失计算公式，分析了过滤与堵塞规律，提出了最佳反冲洗强度和膨胀率，并对反冲洗效果进行了实际验证，为正确设计和使用这类过滤器提供了理论依据。     

基质堵塞对人工湿地净化城市湖泊影响研究

以西安市兴庆湖为研究对象,研究了基质堵塞对水平潜流人工湿地净化城市湖泊水体的影响。针对利用基质进行过滤,生物量增长和分解,化学物质沉积和沉降时导致孔隙堵塞的问题,提出采用水解酸化预处理、间歇运行、药剂溶菌等方法解决。研究表明,基质堵塞问题的解决,使污水中悬浮物截流去除,可极大地提高后续湿地处理系统正常运行的可靠性。     

利用已建堤防减压井解决长江沿岸农村饮水问题初探

通过对荆南长江干堤李家花园堤段减压井基础砂矿化和井水水质进行分析,得出李家花园堤段减压井井水中含有较高的铁及铁化合物是导致减压井化学淤堵的主要原因。国际国内生活饮用水水质标准规定饮用水中铁含量不能超过0.3mg/L,降低减压井井水中铁含量是利用已建堤防减压井解决沿岸农村饮用水问题和减少减压井化学淤堵保障堤防安全的关键。针对减压井井水中铁含量过高的问题,在前人研究成果的基础上,提出了利用物理法、生物法等方法对李家花园堤段减压井井水进行净化处理。此研究对解决沿堤农村饮用水问题及保障堤防安全具有重要意义。