转炉二次除尘系统问题诊断及运行优化

针对某企业150 t转炉二次除尘系统烟气捕集效果不佳、布袋除尘器压差大、运行能耗高等问题进行了系统诊断,利用排查系统管网、实测压力和流量、分析风机特性等手段,找出了问题原因并提出改进措施。通过实施改进措施,优化了150 t转炉二次除尘系统的运行方式,确保二次除尘效果并实现节能、经济运行。     

转炉渣诱导磷酸钙结晶法去除和回收废水中磷的研究

以转炉渣为晶种材料,利用批次结晶沉淀实验,研究不同的反应条件对诱导磷酸钙结晶法去除和回收废水中磷的影响。结果表明,最优反应条件为:pH=9.5,Ca/P摩尔比2∶1,转炉渣用量1.7 g/L,反应时间3 h,在此条件下,碳酸根对反应的影响甚小,对养猪场废水和污泥浓缩池上清液的处理,最高去除率分别达到95.36%和96.54%;转炉渣循环利用10次,回收磷的效果仍然很好。运用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)等测试手段对在最优工艺条件下重复使用10次的转炉渣进行了表征,证明回收的磷主要以羟基磷灰石(HAP)形态存在。     

Artificial neural network based maximum power point tracking controller for photovoltaic standalone system

This article presents a two-stage maximum power point tracking (MPPT) controller using artificial neural network (ANN) for photovoltaic (PV) standalone system, under varying weather conditions of solar irradiation and module temperature. At the first-stage, the ANN algorithm locates the maximum power point (MPP) associated to solar irradiation and module temperature. Then, a simple controller at the second-step, by changing the duty cycle of a DC–DC boost converter, tracks the MPP. In this method, in addition to experimental data collection for training the ANN, a circuit is designed in MATLAB-Simulink to acquire data for whole ranges of weather condition. The whole system is simulated in Simulink. Simulation results show small transient response time, and low power oscillation in steady-state. Furthermore, dynamic response verifies that this method is very fast and precise at tracking the MPP under rapidly changing irradiation, and has very low power oscillation under slowly changing irradiation. Experimental results are provided to verify the simulation results as well.     

Fluid bed gasification – Plasma converter process generating energy from solid waste: Experimental assessment of sulphur species

Often perceived as a Cinderella material, there is growing appreciation for solid waste as a renewable content thermal process feed. Nonetheless, research on solid waste gasification and sulphur mechanisms in particular is lacking. This paper presents results from two related experiments on a novel two stage gasification process, at demonstration scale, using a sulphur-enriched wood pellet feed.Notable SO₂ and relatively low COS levels (before gas cleaning) were interesting features of the trials, and not normally expected under reducing gasification conditions. Analysis suggests that localised oxygen rich regions within the fluid bed played a role in SO₂’s generation. The response of COS to sulphur in the feed was quite prompt, whereas SO₂ was more delayed. It is proposed that the bed material sequestered sulphur from the feed, later aiding SO₂ generation. The more reducing gas phase regions above the bed would have facilitated COS – hence its faster response. These results provide a useful insight, with further analysis on a suite of performed experiments underway, along with thermodynamic modelling.     

40吨转炉除尘水循环使用技术

承钢炼钢一厂4座40吨转炉采用湿法除尘,产量由20吨转炉改造扩产,但除尘水系统没有进行相应改造,系统能力一直不足,系统结垢严重。通过优化冷却水系统,进行适宜的水质稳定处理,解决了除尘水系统结垢问题。     

药——磁复合工艺处理氧气顶吹转炉除尘废水的试验研究

对几种氧气顶吹转炉除尘废水的处理方法进行了对比试验，就处理效果而言，得出药———磁复合工艺优于单独药物凝聚优于单独磁化处理的结论。     

提高转炉除尘效率的实践研究

昆钢第三炼钢厂转炉一次除尘设备过气量超过设计能力,结合实际,进行了除尘器喷头选型和改造,以提高其除尘效率,提高风机转速,减少炉口烟气外溢量。实施以后,除尘器(一文、二文)除尘效率明显提高,实现了放散烟囱达标排放,风机叶轮积灰少,停机清灰时间明显减少。     

污水处理厂水泵应用与节能改造

绍兴污水处理厂于2001年开始运行，其处理工艺中需实现污水的提升，变频技术在啦泵的控制中应用十分广泛。对变频器的原理及在靠污厂远行中所起作用和节能改建方面进行了简单介绍和讨论。     

车用三效催化转化器发展概况

从载体及三效催化剂角度论述了车用三效催化转化器的发展；指出了影响车用三效催化转化器性能的因素，这些因素的作用是协同的；为提高催化转化器的性能，必须采用系统的方法对其进行优化设计。     

特高压换流变压器水喷雾灭火系统有效性实验研究

为考察在特高压换流变压器特殊火灾场景下水喷雾灭火系统的有效性,通过模拟不同数量喷头掉落情况下的冷喷实验,研究分析喷头工作压力、有效喷雾流量、水雾覆盖范围及全包络情况。结果表明：喷头工作压力、有效喷雾流量及水雾覆盖范围受掉落喷头占比影响显著,当掉落喷头占比超过10%时,喷头工作压力和有效喷雾流量均达不到标准规定要求,且喷头射程下降、覆盖范围缩小,无法全包络变压器;当喷头掉落后,消防水直接从消防支管以水柱射流形式喷射,不仅不具备水雾灭火的能力,而且有引发变压器热油火灾扩大的风险。