喷漆车间火灾爆炸事故树分析

为了更好地控制喷漆火灾爆炸事故的发生,根据二起喷漆车间火灾爆炸事故,运用事故树分析方法对喷漆火灾爆炸事故进行了详细分析,按照引发喷漆火灾爆炸事故的主要危险因素,提出了相应的预防措施。通过本文的介绍,为小型喷漆企业预防火灾爆炸事故的发生,提供一些建议和意见,使小型喷漆企业能切实加强喷漆作业过程中的安全生产管理工作,消除事故隐患,从而减少喷漆作业火灾爆炸事故的发生。     

铝粉尘爆炸典型案例分析及安全对策

介绍了铝粉的理化性质和火灾危险性,通过铝粉尘爆炸典型事故案例,分析了铝粉粉尘爆炸的事故特点,铝粉粉尘爆炸的事故原因,探讨了预防铝粉粉尘爆炸的主要技术措施和铝粉粉尘事故发生后一般处置手段和注意事项。     

浅谈化工品储罐区火灾爆炸事故后果模拟

本文介绍了化工品储罐区发生不同类型火灾、爆炸事故的可能性和相应的事故后果模拟方法,并以氧气储罐和液氧储罐为例重点分析了储罐发生物理爆炸的事故后果模拟方法,定量描述物理爆炸事故对人员和环境造成危害的严重程度。     

有机废气管道系统爆炸事故分析及预防措施

将有机废气管道系统爆炸事故作为切入点,对爆炸事故发生原因和预防措施进行了研究。资料表明,蓄热式热力焚烧炉废气处理设备本身不会带来爆炸事故,造成爆炸最主要的原因是由于有机废气浓度远超爆炸下限,且存在点火源。因此,企业加强对废气处理系统内废气浓度的检测和处理,有效开展在爆炸事故状态下废气的排放和紧急处理工作,确保有机废气浓度位于安全线以内,从而降低爆炸事故发生的几率。     

基于事故树分析的化工实验室火灾爆炸危险性研究

根据化工类实验室火灾爆炸事故的事例,建立了基于事故树的可燃气体发生火灾爆炸的模型。由模型可知,实验室可燃气体泄漏发生火灾爆炸事故的基本事件,运用事故树分析方法中的最小割集合和最小径集合以及结构重要度排序。在此基础上对实验室火灾爆炸事故分析研究。并提出具体的预防和改进措施。     

煤矿井下发生爆炸事故后的环境整治策略

煤矿的开采会导致一些爆炸事故,这些事故的发生会对当地的环境产生消极的影响,对当地人民的生活造成阻碍。因此,对于爆炸事故之后的环境整治是一项重要的工作。主要对爆炸事故发生后造成的环境影响进行了分析,提出了相应的解决策略。     

正丁醇氧化制正丁酸试验发生爆炸原因的分析

正丁醇氧化制正丁酸的试验采用氯酸钠代替高锰酸钾作氧化剂,发生了爆炸事故。本文对事故发生的经过和产生事故的原因作了简要介绍和分析。1987年3月26日,在郑州粮食学院有机化学实验室里,发生了一次试验爆炸事故     

盐酸储罐爆炸事故树分析

盐酸储罐火灾爆炸事故是氯碱生产中常见的事故之一。采用系统安全分析方法中的事故树分析方法对盐酸储罐火灾爆炸事故进行了定性、定量分析。给出了盐酸储罐火灾爆炸事故树图,事故树的最小割集、最小径集以及3种重要度。最后基于事故树分析提出了预防事故发生的安全防范措施。     

防止黄磷生产中火灾和爆炸事故发生的措施

黄磷是一种易燃剧毒的化工原料,生产过程易发生火灾和爆炸事故.通过对黄磷生产企业发生的几起事故分析,提出了防止火灾和爆炸事故发生的一些具体措施,供小型黄磷生产企业安全生产参考.     

从一批潜在爆炸危险氢气瓶的成功处置探讨氢气钢瓶爆炸原因及防范措施

通过一起氢气瓶爆炸事故处理,总痞了处置潜在爆炸危险气瓶的成功方案,应用事故树分析方法,结合生产装置实际情况和前后爆炸的3只气瓶,探讨分析了引起氢气瓶爆炸的直接原因,有针对性地提出了防止同类事故发生的措施。     

与强者同场竞技 靠创新促进发展——访青岛福润德塑料挤出技术有限公司总经理赵炳仁先生

一年一届的中国国际塑料橡胶工业展览会(国际橡塑展),是全球多个行业寻找橡塑工业世界性商贸伙伴的机遇,也是企业开拓中国以至亚洲市场商机之"金钥匙"。在25届国     

Hydrogels reinforced with nanoclays with improved response rate

Two series of semiinterpenetrating networks (SIPN) based on linear hydrophilic poly(vinyl alcohol) (PVA) and thermo‐responsive poly(N‐isopropylacrylamide) (PNIPA), physically crosslinked with inorganic clay, are presented. The hydrogels with different crosslinking densities were prepared by varying the content of clay from 1 to 6 wt % and contained linear interpenetrant, PVA in the range of 0.5–1.5 wt %. The effect of clay content on swelling/deswelling behavior and phase transition in PNIPA gels, as well as the feasibility of reinforcing the gels with high molecular weight PVA, were analyzed. The thermal response of hydrogels, followed by DSC, confirmed that the insertion of hydrophilic PVA did not have a significant effect on the onset of the volume phase transition temperature, while the response was faster. The equilibrium degree of swelling of SIPNs and PNIPA hydrogels was in the range of 9–79 and decreased with increasing content of clay. The internal morphology and surface wettability of the hydrogels were investigated by scanning electron microscope analysis and contact angle measurements, respectively. The network structural parameters of the PNIPA and SIPN nanocomposites hydrogels, such as the average molecular weight between crosslinks, M_c, and effective crosslinking density, N_e, were determined by dynamic mechanical analysis. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44535.     

Electrodialysis with brine solutions oversaturated with calcium sulfate

Electrodialysis (ED) was applied to concentrate brine solutions of various concentrations — similar to effluentsfrom the desalination of brackish and industrial water — to about 20%. The consequent reduction in effluent volumes would facilitate a reduction in disposal costs. The energy requirement for concentrating solutions from 70 to 300 mN (0.4-1.8%) to 3.9 N (20%) was in the range 1.5-7.1 kWh/m³, in contrast to approximately 25 kWh/m³ by thermal evaporation. With the aim of preventing precipitation of CaSO4 on the membranes, laboratory-scale ED experiments were carried out on solutions of different compositions to determine the conditions that would lead to the precipitation of excess gypsum on gypsum seeds in a separate precipitator. The results were then applied in a pilot-scale ED unit in which the brine that circulated through the ED brine cells passed through a separate CaSO, precipitator containing gypsum seeds.     

Biological studies with cyclopropenoids inactivated with fatty acids

Cyclopropenoids inactivated by reactingSterculia foetida oil with cottonseed oil fatty acids were fed at three dietary levels to growing rats and laying hens for 4 weeks. At the termination of the experiments, all animals were autopsied and examined microscopically for pathological lesions, but no pathology that could be related to dietary treatment was observed. Hemoglobin, packed cell volume and plasma cholesterol were similar in animals fed all of the diets. Growth rate of rats and egg production of hens fed the experimental diets were similar to those of animals fed the control diet. After 3 and 6 months of storage, eggs from hens fed the inactivated cyclopropenoids were normal and showed no evidence of the unusual characteristics of cyclopropenoid feeding. Lipids of heart, liver and adipose tissues of all the rats and hens varied little from the normal fatty acid composition. Small amounts of three unidentified fatty acids were found in the adipose tissues of rats fed the higher levels of inactivated cyclopropenoids. The results of these feeding studies suggest that inactivation of cyclopropenoids with fatty acids eliminates the unusual biological effects attributable to cyclopropenoids. Presented at the AOCS Meeting, New Orleans, April 1970.     

高压电动机受潮现场处理的技术分析

山东铝业公司水泥厂（以下简称我厂）运行的大型高压电动机较多．有时由于长时间停运或者环境的潮湿，导致电动机的绝缘水平下降，致使电动机不能再次正常启动。因大型电动机是企业的关键设备，其运行好坏直接影响企业生产的正常与否，进而影响企业效益。     

以创新谋发展 以协作促转型

复合肥行业的转型升级已被列为化肥行业"十三五"规划重要内容。介绍我国复合肥行业转型发展期的特征,并提出在此形势下复合肥行业的发展思路;以创新谋发展,促进行业技术水平提高;以协作促转型,助推行业转型发展。     

以创新铸就名牌 以名牌促进发展

介绍厦门正新橡胶工业有限公司在观念、产品、管理和技术方面开展创新活动的经验。观念创新是名牌战略的灵魂,相互理解与支持、创建伙伴关系是公司对外往来的原则,坚决实施名牌战略,坚持以人为本、适才适用的原则;产品创新是占领市场的法宝,根据市场需求不断适时开发新产品;管理创新是维护品牌形象的前提,各项试验均执行企业内控标准,严把产品质量关;技术创新是实施名牌战略的源泉,以自有技术开发各种轮胎。通过开展创新活动,公司利税指标一直位居国内前列。     

Crosslinking of styrene-butadiene rubber with polyurethanes bicapped with benzyocyclobutene

Summary A polyurethane prepared from 1,9-nonanediol and toluene-2,4-diisocyanate with M_n=11,840, was capped on both ends in a reaction with 4-(benzocyclobutenyl) methanol. The polyurethane was used to crosslink styrene-butadiene rubber through Diels-Alder reactions on the benzocyclobutene functionality. The synthesis and characterization of 4-(benzocyclobutenyl) methanol, a molecule not reported previously, is presented. The crosslinking reaction was carried out on intimate mixtures of the telechelic polyurethane and SBR at elevated temperature and pressure. Various physical properties of the crosslinked material were studied.Work done at the Department of Chemistry, University of Akron, Akron, OH 44325, USA     

Boundary-Layer Structure with Hydrogen Combustion with Different Injection Intensities

Results of numerical simulation of the influence of intensity of hydrogen injection through a porous surface in the case of hydrogen burning in the boundary layer are presented. Turbulent characteristics of the flow were simulated using the k–epsiv; turbulence model with Chien's modification for low Reynolds numbers. The diffusion model (infinitely large burning rate) was used to describe the chemical reaction process, but the difference in diffusion coefficients of different substances was taken into account. A comparison of injection with and without combustion shows that the presence of a heat-release front delays the laminar–turbulent transition and significantly deforms the profiles of density and viscosity of the gas mixture. As the injection velocity increases, the flame front is shifted from the porous surface toward the outer edge of the boundary layer. The contributions of injection itself and combustion to reduction of skin friction are analyzed. Key wrds: boundary layer, combustion, porous injection, heat and mass transfer, friction.