袋除尘器的改造措施

对金隅赞皇2号水泥窑头袋除尘器进行了升级改造,改变了原除尘器滤袋寿命短、破损率高、漏风严重的现状。在结构改造方案中,利用我公司专有的袋除尘器CFD软件模拟优化内部分风状况,彻底解决了原有除尘器存在的问题,实现了低阻力、低排放、可靠耐用等目标。     

气箱脉冲式袋除尘器在机立窑上的应用体会

２０００年７月，我厂为３台机立窑安装了袋式除尘器。设备使用后，故障率极高，糊袋频繁，窑面上烟气抽不出来，恶化了工作环境，影响了正常操作。经过努力，自２００１年６月起，袋除尘器运转正常，运转率达９９％以上，窑面通风良好，除尘器出口粉尘浓度为１０mg／m３，基本上看不到粉尘。１结构及工作原理我厂使用气箱脉冲式１０仓袋除尘器，负压工作，使用０．５～０．７MPa的压缩空气逐仓清灰，由单片机控制。当除尘器达到设定时间时（一般为５０s），清灰控制器发出信号，第１仓的提升阀关闭，切断气流，过数秒钟后打开脉冲阀，压缩…     

用“捞水桶法”解决袋除尘器掉布袋的问题

水泥厂经常需要对袋式除尘器进行日常的检查、维护，若有异常的布袋（如破袋、糊袋等）则要更换，难免布袋掉进除尘器锥部。若是大型袋除尘器，从除尘器的气箱盖顶至锥部深达9m左右。通常的做法是：用一根长的细钢筋一端弯成钩子伸进里面往上钩，而钢筋太长又用不上力量，很难钩上；二是打开侧面检修人孔门，人站在梯子上，在相对地面4～5m高处拧下螺丝、拆下门盖，再用钩子把布袋拉出来，整个过程一般2～3h，需两人相互配合，费时、费力。     

电-袋复合除尘器的开发与应用

电除尘器和袋除尘器是目前工业烟气净化的主要设备，为了充分发挥这2类除尘器的优点，我们设想在同一个除尘器内，其前端设置电场(阴、阳极)，在后端设置滤袋。当烟气通过电场时，烟气中的大部分粉尘将被电场收集(仅需一般电除尘器电场的1／3～1／5)，含有少量粉尘的烟气进入后部滤袋。这样，除尘器的阻力将大幅度降低，而且，     

普通袋式除尘器选用的一点经验

除尘器风量的确定主要依据理论计算与长期使用的经验数据,在选定除尘器规格时,一般是考虑最大工况风量再取1 1～1 2储备系数.长期以来这种配套选型被认为是较为合理的.但实际生产中经常出现除尘系统阻力基本处于高值、排风机负荷较大,易破袋和粘袋,滤袋寿命一般只在3个月左右.针对这种情况,我们在选用除尘器时,保持原有风机规格型号不变,除尘器的处理风量按最大工况风量的1 5～1 6倍选型,取得了显著的效果.     

水泥厂窑尾袋除尘器酸结露现象的分析和研究

分析了水泥厂窑尾袋式除尘器酸结露、酸腐蚀的原因,估算了水泥窑尾烟气在不同SO2浓度下的烟气酸露点;并结合水泥行业实际情况,针对避免和减少袋除尘器酸结露和腐蚀问题,提出保证窑尾烟气温度高于酸露点减少冷凝现象、降低漏风率、采用耐腐蚀材料(推荐考登钢)和采用防腐涂层等一系列相关措施。     

MPF-2117立式煤磨饱磨事故分析及处理

1现象2011年12月8日中班我公司HPF-2117立式煤磨发生一起严重的饱磨事故,停磨前磨机压差9 kPa,出袋除尘器压力-9 kPa,袋除尘器压差1 kPa,磨机电流升高达到50～70A,刚开始出现饱磨时磨机吐渣中煤粉较多，当磨机连锁处在解除状态下，煤磨进口风温达100~340℃，出口温度达40℃，入袋除尘器风温较低36℃，煤粉较湿，打开立磨检查磨内煤粉填充率在80％，所用喷口环堵死，被迫连续甩磨。     

袋除尘器阻力浅析

1 前言 众所周知,袋除尘器运行阻力的大小,是评价其性能优劣的重要参数之一.袋除尘器总的阻力为机械阻力和滤料过滤阻力(干净滤料和滤料上沉积粉尘层的阻力)之和.新滤袋阻力一般为100～130Pa;积灰滤料的阻力随运行时间的延长,滤袋的透气率逐渐降低,阻力相应升高,主要视清灰效果而定.在正常运行情况下,大致在800～1150Pa的范围内.     

除尘器及其系统改造技术

1除尘装备及系统的改造方案中材装备集团有限公司环保分公司(原天津院环保公司)开发的袋式除尘器现代设计数字模拟实验平台和行喷脉冲清灰袋除尘技术,应用多年来在更低阻力、更低漏风率、更长滤袋寿命和工作运行更稳定可靠等方面     

煤粉仓自燃的原因分析及处理

<正>1煤磨温度控制参数我公司5000t/d生产线煤磨系统采用MPF2116立磨和FCM气箱脉冲袋除尘器,煤磨利用窑尾高温风机出口热烟气为烘干介质,入口温度一般在270～290℃、入袋除尘器气体温度控制在69～73℃、袋除尘     

佛山市顺德新城区降水中污染物的监测和分析

为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。     

Metabolism of trideuterated iso-lignoceric acid in rats in Vivo and in human fibroblasts in culture

Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders, but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-²H₃]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured. A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994.     

高效液相色谱法分析化妆品中微量成分的研究进展

综述了高效液相色谱法在化妆品中防腐剂、防晒剂中紫外线吸收剂以及性激素的检测等几个方面的应用;同时,介绍了分析所用的色谱柱、流动相、使用的检测手段以及样品的提取方法;最后针对目前存在的问题,提出了高效液相色谱用于化妆品中微量成分分析的研究方向和发展前景。     

Denitrification in shallow groundwater in a coastal agricultural area in Japan

In a coastal agricultural area in the central part of Japan (Shizuoka), we found decreasing nitrate concentration with depth in a shallow groundwater, where the depth to water table varied between 0.6 and 1.2 m below ground surface. High nitrate concentrations (5–29 mg N L^–1) were often observed in the upper layer (0–2 m) of the groundwater, but the concentration decreased to less than 1 mg N L^–1 in the deeper layer. Ammonium was scarcely detected, and the concentration of dissolved oxygen was usually low (< 1 mgO₂ L^–1) in the groundwater. Nitrate in the groundwater often had very heavy nitrogen stable isotope ratios (>20{}). There was a negative relationship between nitrogen stable isotope ratio of nitrate and its concentration. When nitrate was injected into the groundwater with acetylene and bromide (a conservative tracer), nitrate concentration decreased to 20% of the initial level within 5 days, accompanied by the increase in nitrite and nitrous oxide concentration and a little change in bromide concentration. These results indicate that microbial denitrification plays a potential role in the decrease of nitrate in shallow groundwater at the study site.     

我国硝酸工业生产技术新进展

系统叙述了我国硝酸工业2000-2007年生产现状及主要技术成果,尤其指出了国产"四合一"机组的成功投运,使我国硝酸国产化装置取得较大的进步,表现在吨酸的铂耗、氨耗和能耗等方面接近国外引进装置水平,同时介绍了国外双加压法硝酸生产技术的进展.我国已成为硝酸生产大国,仍需以先进的技术改造和发展我国硝酸工业,确保我国硝酸工业健康有序地发展,加快从硝酸生产大国向强国迈进的步伐.