共查询到20条相似文献,搜索用时 171 毫秒
1.
2.
研究了在垂直方向上对圆筒式加热炉辐射室进行分片预制的方法,分析了辐射室分片预制方法的特点。结果表明:这种方法大大减少了现场安装组对工作量,减少了人工,机械的使用量,节约了成本。降低了工作风险,提高了施工进度,保证了工程质量。 相似文献
3.
《中国石油和化工标准与质量》2014,(2)
我国科学技术的不断发展,推动了我国GPS技术的不断进步,在我国多个领域获得了应用,实现了我国国民经济的快速、高效的增长。GPS在我国油田井位测量中的应用,大大提高了工作人员的工作效率,且保证了油田井位测量结果的准确性。本文先是对GPS全球定位系统进行了概述,又详细阐述了GPS技术在井位测量中的建立,后分析介绍了GPS全球定位系统的其它应用。 相似文献
4.
带式过滤机在多品种氢氧化铝生产中的应用 总被引:1,自引:0,他引:1
介绍了带式真空过滤机的工作原理及其在多品种氢氧化铝生产方面的应用情况,并对带式真空过滤机使用过程中存在的问题进行了改造。改造之后,提高了洗涤过滤效率,降低了滤饼水分,降低了能耗,提高了产量,确保了产品质量,取得了较好的经济效益。 相似文献
5.
6.
酒瓶顶盖注塑模具设计 总被引:4,自引:0,他引:4
分析了酒瓶顶盖的结构,提出了模具设计的关键点,设计了模具的整体结构。根据塑件分型面的位置,设计了推件板和推杆的二次推出机构,在型芯紧固螺钉中心钻孔,解决了推杆的安装问题。多个分型面处采用了锥面配合,解决了导向件磨损的问题,提高了模具的精度,延长了模具的寿命。经过生产验证,该摸具结构合理、动作可靠。 相似文献
7.
设计了一款软硬件结合的八位模数转换器。分析了脉宽调制波形的特性,研究了可编程计数阵列的工作原理,建立了系统实现的理论模型。经过理论分析和实际测试,设计了系统硬件电路。对硬件系统进行了抽样测试,并将抽样数据与理论值进行对比研究。采用最小二乘法对抽样数据进行拟合,对拟合结果进行对比分析研究,建立了优化的模数转换数学模型。在Keilv4平台上,设计了模数转换的软件系统。在某钢化玻璃加热炉上得到应用,系统工作稳定可靠。 相似文献
8.
高庄煤矿供热系统的改造 总被引:1,自引:0,他引:1
高庄煤矿针对原锅炉供热系统存在的问题进行了改造,拆除原锅炉,采用邻矿电厂的富余蒸气作热源,安装热交换器组。改造后保证了供热质量,节约了能源、资源,提高了矿区环境质量,降低了运行维护费用,节省了人力资源,减少了占地面积,节约了各项检查检测费用。 相似文献
9.
10.
11.
合成纤维产业现状和未来发展方向 总被引:1,自引:0,他引:1
叙述了国内外合成纤维工业的发展现状,指出世界范围内正在展开的新一轮竞争的主要特点,合成纤维的生产和消费中心已转移至中国,中国合成纤维市场消费持续增长,未来受到制约。分析了合成纤维技术进步的主要进展状况,生产趋向于大型化和柔性化,品种开发向高新技术纤维领域发展。提出了未来符合可持续发展方向的生产工艺和产品品种。 相似文献
12.
The use of anthracite in the production of high-carbon ferrochrome is assessed. The theoretical and technological aspects of electrothermal production of high-carbon ferrochrome are analyzed. The physicochemical characteristics of anthracite and coke nuts are compared. It is established that the ash content of anthracite is low. More importantly, its content of phosphorus and sulfur is very low. An advantage of anthracite is its high electrical resistance. The use of anthracite in the production of high-carbon ferrochrome in 21-MV A furnaces reduces the consumption of reducing agent (by 1.9%) and electric power (by 6.8%). The extraction of chromium is practically unchanged. The production costs (per 1 t of high-carbon ferrochrome) are reduced. The use of anthracite in more powerful furnaces (63 MV A) permits significant increase in the working voltage and decrease in power consumption by 2.0–2.5%. The phosphorus content in the ferrochrome is reduced with increase in anthracite content in the batch. 相似文献
13.
14.
以摇瓶和发酵罐两种培养体系为对象,考察了剪切力对木葡糖醋杆菌生长和细菌纤维素合成的影响。结果表明,剪切力的存在对细菌纤维素的合成不利,在添加玻璃珠的三角瓶中经9轮震荡培养后,细菌纤维素的产量降至原始菌株的23.6%;在机械搅拌罐中培养时,用剪切力大的六叶平桨进行发酵,细菌纤维素的产量最低,而用转速降低的框式桨进行发酵,细菌纤维素的产量较高。剪切力也影响木葡糖醋杆菌的形态和生长周期,剪切力的存在使细菌菌体变小,单位体积发酵液菌浓降低,菌落形态改变,菌株进入对数生长期的时间延后。实验结果为今后改进提高细菌纤维素动态培养产量提供了理论依据。 相似文献
15.
16.
The thermal degradation of polyvinyl chloride in phenolic solvents has been investigated in an atmosphere of nitrogen in the temperature range 137–206°C. The solvents used were phenol, o-cresol, methyl, ethyl, amyl, and phenyl salicylates. The reaction was fast in phenol and slow in amyl salicylate. The rate of dehydrochlorination decreased with increasing size of the alkyl side chain in salicylates. The activation energy was low in amyl salicylate (26 kcal/mole) and high in o-cresol (29 kcal/mole), and for other solvents it was in between these two values. The results have been explained as being due to the variation in the reactivity of phenolic hydrogen and to steric factors of the various substituents. 相似文献
17.
概述了世界聚酰胺原料及其纤维的生产现状和发展趋势;世界己内酰胺的生产能力稳步增长,新增生产能力主要集中在亚洲,己二酸新增产能主要来自中国大陆,己二胺的生产主要集中在北美和西欧,世界聚酰胺纤维的增长主要源自于亚洲,正朝多功能、高性能、生物基等方面发展;我国己内酰胺生产能力和产量均保持两位数的年均增长率,己二酸的生产发展迅速,呈现供过于求,聚酰胺纤维生产主要集中在浙江省、江苏省、福建省;指出我国应加强聚酰胺纤维的改性研究,加快产业链及产品结构调整,实现聚酰胺纤维规模化及原料国产化生产,以促进我国聚酰胺纤维工业的持续稳步发展。 相似文献
18.
19.
20.
A three-dimensional mathematical model of the combustion of pulverized coal and coke is developed. The model is applied to the region of lance-blowpipe-tuyere-raceway-coke bed to simulate in-furnace phenomena of pulverized coal injection in an ironmaking blast furnace. The model integrates not only pulverized coal combustion model in the blowpipe-tuyere-raceway-coke bed but also coke combustion model in the coke bed. The model is validated against the measurements under different conditions. The comprehensive in-furnace phenomena are investigated in the raceway and coke bed, in terms of flow, temperature, gas composition, and coal burning characteristics. The underlying mechanisms for the in-furnace phenomena are also analysed. The simulation results indicate that it is important to include recirculation region in the raceway and the coke bed reactions for better understanding in-furnace phenomena. The model provides a cost-effective tool for understanding and optimizing the in-furnace flow-thermo-chemical characteristics of the PCI operation in full-scale blast furnaces. 相似文献