共查询到17条相似文献,搜索用时 140 毫秒
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公路隧道纵向通风系统射流风机选型计算 总被引:4,自引:0,他引:4
为满足公路隧道通风降噪的需要,提出了射流风机推力影响因素及其选用2要求。在计算隧道中总推力的前提下确定出射流风机的推力。并确定所用风机的数量。 相似文献
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利用力控Forcecontrol V7.1组态软件设计了隧道智能监控系统,用户可全天候监视各个监控子系统,完成对隧道现场运行数据的收集、分析、控制、统计、管理。在隧道通风控制子系统中,基于模糊控制理论,采用CO浓度和烟雾浓度作为模糊系统的输入变量,PLC控制器采用可进行参数在线整定的Fuzzy-PID控制算法,改善系统控制效果。同时利用变频调速技术对隧道内射流风机的输出功率、转速进行调控,降低能耗,减少运营成本。 相似文献
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我国高速公路隧道通风照明系统在保障营运安全方面发挥着极其重要的作用。为保障隧道通风照明系统正常运转,技术人员需定期进行现场巡检,判断系统是否正常运行。鉴于此,研制出一套高速公路隧道通风照明系统定期自启动检测系统,该系统可定期自动启动,也可由技术人员通过上位机远程启动,启动后系统将自动检测隧道中射流风机和照明灯的运行状态,并将检测结果上传至上位机。技术人员可通过上位机定期查看辖区内各隧道通风照明系统启动后的运行状态,不必亲自赶赴现场启动隧道通风照明系统进行检查,从而减轻了技术人员巡检的工作量,提高了工作效率。 相似文献
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为解决原有通风系统间歇时间长、通风效率低等问题,西曲矿通过仿真分析对矿井通风系统进行优化.对比模糊控制技术与自适应模糊PID控制技术的仿真效果,确定选用自适用模糊PID控制技术,并设计了自适应模糊PID变频控制系统.经过现场应用研究发现,经过优化后的自适应模糊PID风机变频系统达到了预期的效果,可为矿井通风系统的优化设... 相似文献
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煤矿通风系统中,局部通风属于重要组成部分,其使用状况直接影响煤矿生产安全。当前,我国许多煤矿局部通风系统内风机长期处于高频工作状态,智能变频调节没有得到普及,这样不仅不利于长期使用,而且耗电量也会持续增加。基于此,从风量智能控制研究出发,结合模糊预测与故障诊断,分析了局部通风矿机变频调速监控系统部分设计方案。 相似文献
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Joon-Hyung Kim Jin-Hyuk Kim Kwang-Yong Kim Joon-Yong Yoon Sang-Ho Yang Young-Seok Choi 《Journal of Mechanical Science and Technology》2012,26(6):1793-1800
This paper describes a numerical optimization procedure for performance improvement of a tunnel ventilation jet fan. We employ optimization techniques based on a PRESS (predicted error sum of squares)-based-averaging (PBA) model to improve the aerodynamic performance of a tunnel ventilation jet fan. For numerical analyses, three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations with a shear stress transport turbulence model are discretized using finite volume approximations and solved on hexahedral grids to evaluate the total efficiency at operating conditions as the objective function. Numerical results are verified by using experimental data for the total efficiency and the effective outlet velocity at operating conditions. Further, four geometric variables are used defining the meridional length and the thickness profile at the hub and shroud in the jet fan rotor as the design variables for numerical optimization. The results of numerical optimization show a significant improvement in the total efficiency of the optimum model in comparison with the base model. 相似文献
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粮库通风冷却风机的输出轴功率与转速的三次方成正比.因此,当粮库负荷减少时,可降低通风冷却风机的转速以减少能耗.其方法是,根据粮堆进、出气的温差值来控制变频器的频率,以控制风机电机转速.实践证明,风机变频调的节能效果明显. 相似文献
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通过对矿井主通风机喘振的原因的综合分析,认为应从通风机、机房风道和通风系统为一体的角度研究矿井通风机喘振的综合治理。 相似文献
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简要介绍了变频调速技术的节能原理,并以风机系统为例,分析了变频调速装置在离心式引风机控制中应用的现状与效果,变频调速装置除了具有节能效果外,还可以改善工艺状况,具有广泛的优越性。 相似文献
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对有单独工作轮的可逆轴流风机在正风与反风时的情况进行了分析,根据翼形绕流机理,提出了一种新翼形——双圆弧“S”形翼形,并进行了吹风试验。试验表明,这种翼形的正、反风性能完全相同,与轴流风机的常规机翼翼形相比,其正风性能虽稍低,但反风性能则大大优于后者。当风机叶片采用新翼形成形时,可获得接近于正风性能的最佳反风效果。这时,只要风机直接反转即可实现反风,并达到与正风时的基本相同的风量、风压与效率。 相似文献
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煤矿企业既是产能大户又是耗能大户,节能降耗已成为煤矿企业增收节支的重要指标,许多煤矿企业都非常重视高耗能用电设备的节能改造工作。通风设备是煤矿的主要耗能设备之一,本文以平煤八矿主通风机节能改造为例,对矿井通风机实施变频改造的必要性,变频改造系统的设计,改造后的经济效益进行了分析。论证了高压变频器的应用于煤矿主扇风机的系统改造,必将取得良好的运行效果和经济效益。 相似文献
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Makhsuda Juraeva Kyung Jin Ryu Sang-Hyun Jeong Dong Joo Song 《Journal of Mechanical Science and Technology》2013,27(8):2359-2365
A computational model of an actual Seoul subway tunnel was analyzed in this study. The computational model was comprised of one natural ventilation shaft, two mechanical ventilation shafts, one mechanical air supply, a twin-track tunnel and a train. The natural ventilation shaft discharges and supplies air due to the train’s movement. The mechanical ventilation shaft and the mechanical air supply discharges and supplies, respectively, the airflow from the axial flow fans in the middle of the ducts of the shafts. A sliding-curtain was installed in the tunnel. The objective of this study was to numerically investigate train-induced airflow in the twin-track subway tunnel with natural and mechanical ventilation shafts and an installed curtain. The numerical analysis characterized the aerodynamic behavior and performance of the ventilation system by solving three-dimensional turbulent Reynolds-averaged Navier-Stokes equations. ANSYS CFX software was used for the computations. The airflow velocity from the computational results was validated by experimental results. Understanding the flow pattern of the train-induced airflow in the tunnel is necessary to improve ventilation performance. The ventilation and aerodynamic characteristics in the tunnel, including train-induced airflow, were investigated by analyzing the volume flowrate at the exits of the ventilation shafts and the velocity in the tunnel. The computational results were compared to cases with and without a curtain installed in the twin-track tunnel. As the train passed the mechanical ventilation shafts, the quantity of discharged-air in the ventilation shafts decreased rapidly. The flowrate at the exits of the ventilation shafts was gradually recovered with time, after the train passed the ventilation shafts. The airflow at the natural shaft and mechanical ventilation shaft 2, which was closest to the curtain, was increased. The computational results showed that the installed curtain can improve ventilation performance in the tunnel. 相似文献