通风方式对化工车间火灾影响的实例分析

在分析化工企业火灾危险性的基础上,建立了化工车间火灾危险度分析数学模型。根据工程实际,分别对正常工业通风和火灾后事故通风工况进行了火灾危险度计算。计算结果表明事故通风及防排烟系统启动后,能有效的降低车间的火灾危险性等级。研究结果用于指导化工厂通风系统设计及提高消防安全管理水平。     

Studies of the combined effects of some important factors on the likelihood of flashover

Among those factors that affect the likelihood of flashover in enclosure fires, the thermal inertia of lining materials, ventilation factor of door openings, heat release rate of fuel, and internal dimensions of the enclosure are the most important. The effects of the four factors are related, so it is very necessary to study their combined effects. In the present study, based on analyzing the approximate heat balance on the control volume similar to that in the MQH method, a dimensional relationship was derived that facilitates the estimation of pre‐flashover temperatures, which is used in the popular guidance literature as the key parameters for practical methods of predicting flashover. By correlating a vast amount of data gained in both small‐scale and large‐scale enclosure fire experiments, an important equation was obtained, which can embody explicitly and quantitatively the combined effects of the four important factors on the likelihood of flashover. According to the temperature criteria of 600°C identifying flashover, a new ‘combined method of predicting flashover’ was put forward. The validity of the method was verified in small‐scale experiments, and the results showed that it could be applied to predict well whether flashover occurs in enclosure fires or not. Copyright © 2010 John Wiley & Sons, Ltd.     

塑料挤出型材车间公用工程设计

鉴于当今人们对塑料门窗需求量的增大，通过对5个塑料挤出型材车间的设计，将其公用工程设计整理成文，总结出塑料挤出型材车间的采暖通风设计，压缩空气系统设计，制冷系统设计的较详尽的方案，以供有关设计技术人员参考。     

本质安全型一通三防工作体系的创建与实施

通过对冀中能源股份有限公司所属矿井“一通三防”安全生产现状的分析,提出了创建该公司本质安全型“一通三防”工作体系的目标、具体措施、运行与管理机制,并通过实施,全面提升了“一通三防”工作质量及安全保障程度,为建立本质安全型矿井、建立安全生产的长效机制奠定了基础。     

矿井风量优化调节

本文介绍一种新的矿井风量调节计算方法和计算机程序。该方法的实质是以 风网系统的最大阻力路线的阻力为基础,用增阻法调节风量。其特点是根据不同 的风网结构得出众多的调节方案,然后按照矿井生产的具体条件优选最佳调风方 案。该方法既可用于局部风网,也可用于全矿系统。此外,该程序还可提供一些 有益的中间信息,适于矿井应用。     

喷锌生产线通风除尘系统计算机辅助设计

作者对球墨铸铁管表面喷锌生产线通风除尘系统进行了设计，在系统参数的选择和计算工作中采用计算机进行辅助设计。通风除尘系统的合理设计为喷锌生产线的无尘化生产提供了保证。     

煤矿乏风甲烷分离富集过程的数值研究

建立了吸附床内煤矿乏风二维气体流动、吸附传质的数学模型,以轴向流吸附床为研究对象,对活性炭富集分离煤矿乏风甲烷过程进行了模拟,得到了各个循环步骤下床内详细的流动、浓度和吸附量分布;详细分析了活性炭吸附床对煤矿乏风甲烷的吸附富集特性,并对回收时间进行优化,模拟结果与实验结果符合较好.另外,还对不同原料气浓度工况进行了对比研究.     

矿井自然风压的热力学分析与计算

本文以热力学第一定律为依据对矿井自然风压进行了分析，并提供了稳态、稳流条件下自然风压的计算方法。     

Putative Steroidal Pheromones in the Round Goby, Neogobius melanostomus: Olfactory and Behavioral Responses

To identify potential hormonal pheromones of the round goby (Neogobius melanostomus), a species recently introduced to the Great Lakes, we used electro-olfactogram (EOG) recording to examine olfactory responsiveness to more than 100 steroids and prostaglandins. Neogobius detected free and conjugated 18-, 19- and 21-carbon steroids, but did not detect prostaglandins. EOG cross-adaptation, used to determine if Neogobius can discriminate the detected compounds at the sensory level, suggested that the detected steroids act on four classes of olfactory receptor mechanisms named (according to the most potent ligand for each): estrone, 17 beta-estradiol-3 beta-glucuronide, etiocholanolone, and dehydroepiandrosterone-3-sulfate. Although none of the detected steroids induced reproductive behaviors, exposure to steroids from three of the four receptor classes (estrone, 17 beta-estradiol-3 beta-glucuronide, or etiocholanolone) increased ventilation rate in males, whereas only etiocholanolone increased ventilation rate in females. Using the ventilation increase as a behavioral bioassay of steroid detection, behavioral cross-adaptation studies in males demonstrated that steroids discriminated at the sensory level are also discriminated behaviorally. These findings suggest the round goby may use steroids as putative pheromones.     

Experimental study on the effect of lateral concentrated smoke extraction on smoke stratification in the longitudinal ventilated tunnel

Smoke is the main cause of death in tunnel fires. It is one of the important measures to maintain smoke stratification in the early stage of tunnel fire. This article focused on experimentally studying the combined effect of lateral concentrated smoke extraction and longitudinal ventilation on the smoke stratification, which never be revealed before. The velocity of the smoke layer and air layer, vertical temperature distribution, and the flow patterns of the smoke were measured. It was found that the longitudinal ventilation and lateral concentrated smoke extraction would affect the flow of the smoke and change the shear velocity between the smoke layer and air layer, then, the patterns of the smoke layer will be affected. And the flow patterns with Froude (Fr) number can be classified into three categories: (a)Fr < 0.6 , with stable smoke stratification; (b) 0.6 < Fr < 0.85 , with a stable smoke stratification but the blurring interface; and (c) Fr > 0.85 , the smoke layer is completely unstable. The result can provide a reference for ventilation design of immersed tube tunnels.