溴生产防腐风机的研制及应用

针对溴生产中风机腐蚀严重现象，提出相应防腐处理方案。改进后的防腐风机使用周期长、安全、可靠。     

防腐防爆酿造专用风机

防腐防爆酿造专用风机一、该机外壳采用ＰＶＣ工程塑料，风叶为ＩＣｒ１８ＮｉｇＴ不锈钢，避开了普通风机易腐烂使用寿命短及全塑风机老化易弓愧爆炸等缺陷，且安装、拆卸方便。二、采用倾斜２８℃进风。专为酿造加盖制曲设计，风量、风压达到最佳效果。三、安装费用小，...     

酸雾风机系统的修复

酸雾风机系统损坏造成酸洗车间挥发性和腐蚀性气体难以及时排出。造成损坏的原因有:酸洗工艺由硫酸改为盐酸,排风机底部钢结构支架断裂,管道系统阻力较高。改进的措施:在排风机进口前增加喷淋除酸装置,风机叶轮表面采用玻璃钢防腐处理,钢结构支架用钢板或槽钢加固,调整橡胶减振垫的数量和安装位置,适当降低离心风机的转速。对系统风量和管道阻力进行计算校核,校核结果满足使用要求。生产使用表明,修复后的酸雾风机系统满足酸洗生产的要求。     

老式侧风机型干燥室改造的实践

山河屯林业局山亚木制品有限公司有老式侧风机型干燥室２２座，占地面积３５００ｍ２，年设计干燥能力４万ｍ３。１干燥室改造前状况１．１干燥室密封、保温、防腐三大性能差。干燥室为砖砌体结构，侧面通风、轨道式材堆车。由于长期使用，年久失修，墙面防腐涂料及大门铁...     

玻璃钢防腐产品

河南市沁阳市开源防腐公司,90年被评为河南省特级信用企业,原因是该厂生产的各种规格的酸洗槽、电镀槽、贮藏缸、运输缸、管道、冷却塔、风机、档水板、酸雾净化塔等玻璃产品,质量过关,用户满意.尤其是BST玻璃钢酸雾净化塔,能对电镀、酸洗等所用的酸碱车间,既抽风又净化,没有     

国产机替代COMAS打叶线进口风机的探讨

根据风机定律、风机特性以及本厂仿ＣＯＭＡＳ打叶线上的进口风机使用情况，通过实际测量、计算，简要叙述如何选用国产风机替代进口风机，解决在国内风机厂找不到相同型号风机而影响生产的问题。     

基于可靠性的状态监控预知系统——转炉风机在线监测及诊断系统技术方案

炼钢生产中的除尘风机是将炼钢生产过程中的烟气及时排出。炼钢过程中产生大量的烟尘,烟尘中含有易燃气体和金属颗粒,经风机将其排至烟囱放散或输送至煤气回收系统,在排出过程中烟气经过风机转子,烟尘中的小金属颗粒会沾在转子表面从而造成风机转子表面不均匀,在高速运转的情况下,风机振动幅度变大,使风机故障增大,利用效率大大减小。风机在线监测系统通过监测风机的振动、振幅、速度及风机和电机的轴承脉冲信号,通过一系列运算、判断,及时通知操作人员进行定期维修,减少风机跳闸故障,提高风机作业率,同时提高转炉利用效率,产生更高的效益。     

冶炼厂风机动平衡工艺技术分析

风机是冶炼厂生产的重要设备。加强对风机的维护和保养,显得十分重要。特别是风机叶轮的严重磨损(腐蚀)、积灰积垢,造成风机转子不平衡,从而导致整个风机振幅加大,严重影响生产的正常运行。因此,如何在施工现场为风机作平衡并清除不平衡因素,具有非常重要的意义。本文从冶炼厂风机动态平衡的相关概念谈起,然后就冶炼厂风机常用的平衡方法进行说明,最后就冶炼厂风机动平衡工艺进行分析。     

三点作图法现场做风机叶轮的动平衡方法

由于热电厂的排粉风机、引风机叶轮容易磨损,常导致风机轴承振动偏大。通过多次对排粉风机进行现场动平衡试验．提出了风机叶轮三点作图法现场动平衡的方法,可有效地消除风机振动偏大的设备故障。     

服务造纸行业 助力纸企发展

鞍山钢峰风机有限责任公司位于辽宁省鞍山市千山区达旗街9号,公司成立于1979年,占地面积12万平方米,是国家首批定点风机制作的专业化大型企业之一,是国家高新技术企业、中国风机协会副会长单位,中国国家风机标准制定单位,国际ISO风机标准参编单位,辽宁省名牌产品,企业内建有辽宁省风机产品技术中心和辽宁省风机产品质量检测中心。     

土工合成材料在港口工程中的应用

土工合成材料具有产品质量稳定、质轻、易于运输和施工、耐酸碱、抗腐蚀、造价低、效果好等优点,在港口工程中得到了广泛的应用。以3个港口工程为例介绍土工合成材料的反滤和隔离作用。     

数值模拟技术预测风机两种摆放方式对冷库堆垛货物的影响

为研究不同风机摆放方式对满载货物冷库气流分布以及堆垛货物温度分布的影响,以实际参观走访的中型冷库(24.3m×21.6m×7.2m)为蓝本,利用多孔介质模型并运用ergun方程对货物侧进行建模,分别建立风机下吹型和对吹型冷库模型,使用fluent软件对模型进行稳态模拟,对比分析两种风机摆放方式对该库及堆垛货物内部气流组织分布的影响。结果发现:下吹风冷库气流在货物区域温度和流速分布均匀,对吹风式冷库在货物区域温度分布并不均匀,气流风机射流末端货物区域存在大片高温区,因而可以得出:在所讨论的冷库中,风机下吹风摆放方式优于冷库风机对吹风摆放方式。     

明矾替代物生产马铃薯淀粉粉丝的研究

传统加工生产粉丝时均加入含铝物质-明矾,铝摄入过量对人体有害。试验采用绿豆淀粉、魔芋粉和复合磷酸盐3种物质替代明矾,并通过测定粉丝的断条率和烹煮损失率分析了替代物对粉丝质量的影响。结果表明,绿豆淀粉对粉丝质量有一定改善作用,添加4%～6%的绿豆淀粉、0.4%～0.6%的魔芋粉和0.4%～0.6%的复合磷酸盐能明显改善无明矾马铃薯淀粉粉丝的品质。正交试验表明,以断条率为指标各因素影响大小次序是B>C>A;以烹煮损失率为指标各因素影响大小次序是A>C>B,结合试验结果、生产工艺和产品经济效益,以A1B2C3为最佳组合。断条率为6.7%;烹煮损失率为7.2%。其品质接近或超过传统添加明矾的粉丝。     

The effect of day-only versus day-plus-night cooling of dairy cows

The aim of this study was to assess effects on milk yield (MY), rumen temperature, and panting score when lactating dairy cows were cooled during the day only or during the day and night. The study was conducted over 106 d during using 120 multiparous Holstein-Friesian cows assigned to 2 treatments (60 cows/treatment; 2 pens/treatment): (1) day cooling (DC): overhead sprinklers (large droplet) and fans while in the dairy holding yard only, shade and fans at the feedpad, and a shaded loafing area; and (2) enhanced day+night cooling (EDN): overhead sprinklers (large droplet) and fans in dairy holding yard, ducted air blowing onto cows during milking, plus thorough wetting (shower array) on exit from dairy; shade and fans at feedpad (turned off at night); and shaded loafing area + ducted fan-forced air blowing onto cows at night. The ducted air at night was manually activated at 2030 h when the maximum daily temperature-humidity index exceeded 75 and remained on until 0430 h the next day. The cows were fed a total mixed ration ad libitum, and feed intake was determined on a pen basis. Rumen temperature and cow activity were obtained from each cow at 10-min intervals via rumen boluses. Panting scores were obtained by direct observation 4 times a day at approximately 0430, 0930, 1530, and 2030 h. Cows were milked twice daily: 0500 to 0600 h and 1600 to 1700 h. Individual MY were obtained at each milking and combined to give individual daily totals. The EDN cows had greater daily MY (+2.05 kg/cow per day) over the duration of the study compared with DC cows. Rumen temperature during the third heat wave was lower for EDN (39.51 ± 0.01°C) than for DC (39.66 ± 0.01°C) cows. During the most severe heat wave (heat wave 3), MY for the 2 groups was similar, but over the 6 d following the heat wave, EDN cows had greater daily MY (+3.61 kg/cow per day). Rumen temperature was lower for EDN (39.58 ± 0.01°C) than for DC (40.10 ± 0.01°C) cows.     

液力偶合器用于碱炉给水泵、引风机的节能效果

简述了青纸15万t／a木浆系统碱回收炉给水泵、引风机上液力偶合器的运行特点，着重探讨了碱回收炉给水泵、引风机采用液力偶合器变速调节的节能效果。     

Technical note: Effects of adding shade and fans to a feedbunk sprinkler system for preparturient cows on health and performance

The purpose of this study was to examine the effects of adding shades and fans to a feedbunk-mounted sprinkler system on preparturient Holstein cows during summer heat stress. Outcome variables included postpartum milk production, changes in body condition score, changes in serum concentrations of nonesterified fatty acids (NEFA), and incidence of postparturient disorders. Four hundred and seventy-five prepartum multiparous cows, 250 to 257 d pregnant, were randomly allocated to 2 study pens. Treatments consisted of sprinklers over the feed bunk (n = 236); and sprinklers, fans, and shades over the feed bunk (n = 239). Data were used from cows spending a minimum of 14 d in their assigned pen. After parturition, all cows were housed and managed under identical conditions. Data recorders in each pen recorded environmental temperature and humidity every 30 min. Body condition scores were taken at study enrollment, parturition, and 60 d in lactation. Following parturition, the presence of retained placenta, metritis, milk fever, and displaced abomasum were recorded for the length of the study. Milk production was measured using twice-monthly Dairy Herd Improvement Association tests for the first 60 d in lactation. Blood was sampled twice weekly in 98 cows and analyzed for serum NEFA during the last 3 wk before parturition. Cows spent approximately 28 d in their respective treatments. Average daily environmental temperature (± SD) in the sprinkler only treatment was 26.4 ± 7.2 vs. 25.1 ± 8.6°C in the shade, fans, and sprinkler treatment during the length of the trial. There was no difference in body condition score changes, incidence of postparturient disorders, or serum NEFA concentrations. There was a significant difference in total 60-d milk production, and an economic benefit over the preexisting cooling system.     

全自动粉丝挤出机的设计

全自动粉丝挤出机是依据龙口2万吨的粉丝生产流水线要求专门设计的自熟挤出粉丝机；本机是在对现有机型存在的缺点进行分析的基础上，结合自动化设计的要求；首先对粉丝挤出机进行机械结构上的改进，增添部分自动控制元件，设计出全自动粉丝挤出机。经过企业经济分析，全自动粉丝机能带来很高的经济效益。     

电感耦合等离子发射光谱测定乳扇中的铝含量

目的 建立电感耦合等离子发射光谱法测定乳扇中铝含量的分析方法。调查市售样品中铝的含量是否异常。方法 采用湿式消解法处理乳扇样品, 电感耦合等离子发射光谱测定样品中铝的含量, 同时进行精密度实验和加标回收实验。测定市场收集的乳扇样品中铝的含量, 并与严格按云南省地方标准(DBS 53/010-2016)制作的乳扇样品进行比较。结果 铝在0~10 mg/L范围内线性关系良好, 相关系数r达0.999928, 方法的检出限为0.5 mg/kg, 定量限为1.5 mg/kg, 精密度为2.5%~3.1%, 加标回收率在96.6%~105.0%之间。按地方标准制作的乳扇样品中铝含量较低, 在3.2~5.3 mg/kg之间, 部分市场收集的样品中铝含量偏高。结论 本方法操作简便、结果准确, 可作为乳扇中铝含量检测的方法。乳扇应严格按照地方标准制作。     

A new method of ensuring even distribution of a fumigant in flexible fumigation chambers using external fans

A series of commercial fumigations to control narcissus fly larvae in bulbs for export was carried out to determine the effectiveness of a gas distribution method that utilizes external fans positioned outside the chamber. The principle is to generate air motion using the flexibility of the PVC liner. This is done by directing an air-flow along the walls of the liner, thus creating a ripple motion that generates an internal turbulence which mixes the air with the fumigant inside the chamber. With fans placed opposite the corners of the bubble it was possible to divide the airflow along all sides of the bubble wall. Methyl bromide concentrations recorded over the 4-h fumigation period, were compared with previous results obtained when the fumigant was mixed by recirculation. The use of external fans in combination with flexible PVC chambers enabled an even gas distribution to be achieved within the chambers in 1-1.5 h whereas under recirculation, even distribution was not reached during the entire 4-h fumigation period. Post-fumigation mortality data on narcissus fly larvae revealed 100% kill.     

通风服装对人体热舒适的影响

为研究高温环境中降温服装对人体热舒适的影响,通过出汗暖体假人实验和真人着装实验分别研究了通风服的热湿性能以及对人体热舒适的影响。研究发现：当通风量为0.012 m3/s 时,通风系统的引进使服装的湿阻减小58%。男性受试者穿着通风服在25℃、相对湿度50%的环境条件下运动,其局部皮肤温度、平均皮肤温度均比风扇未打开时低;其中,胸部和腿部皮肤温度降低幅度最为明显;打开与关闭风扇两种实验条件下,受试者的局部皮肤温度以及平均皮肤温度有显著性差异。运动20 min 和休息20 min后,风扇打开时的平均皮肤温度比未打开时分别低2.4、0.9 ℃;研究表明该通风服装可用来作为改善人体热舒适的服装雏形。