矿用柴油机车中新型无源液位传感器设计

针对目前矿用柴油机车液位传感器无法动态调整水箱剩余水位的报警高度、可靠性较差等问题,提出一种新型无源液位传感器的设计方案。该液位传感器采用干簧管和电阻阵列等无源器件,实现了对水箱水位高度的连续监测,并可设置报警深度,可靠性和耐高温性能较好。     

岛上原油贮罐罐底边缘板腐蚀机理分析及防护措施

对马鞭洲岛广石化码头原油罐罐底边缘板腐蚀机理进行分析，并采取相应的防护措施。实践表明，对提高码头原油贮罐的安全使用寿命是有效的。     

小型储气罐火灾工况数值模拟分析

以某输气管线气液联动执行机构中的储气罐为例,利用Ansys Fluent软件建立同比例三维模型,模拟火灾工况下,外部热量不断输入,罐内压力和罐体温度随时间的变化情况。利用Aspen Hysys软件模拟计算该小型储气罐在火灾工况下安全泄放所需的最小安全阀口径。结果表明,当钢制储气罐外部发生火灾时,罐体温度和罐内压力急剧升高,在很短的时间内就能达到储气罐坍塌温度和储气罐设计压力;达到钢制储气罐坍塌温度的时间滞后于达到储气罐设计压力的时间;从安全的角度,设置安全阀可安全有效泄放气体,即使储气罐发生坍塌,也有助于降低事故发生的危害程度;确定的安全阀最小口径为0.03 cm²,建议选型的安全阀口径不低于0.05 cm²。     

新型防雷及抗干扰方法在电铲控制系统的应用

电铲是采区主要采掘设备,其弱电控制系统是电铲正常可靠运行的关键。由于雷击或电磁干扰造成弱电控制系统装置的损坏或工作异常等故障,已成为影响电铲安全正常运行的重要因素。针对现有电铲控制系统防雷抗干扰现状、存在的问题及影响,研究了一种新型防雷抗干扰方法,并分析了其在电铲弱电控制系统中的应用和实施效果。实际运行表明,新型防雷抗干扰方法能够有效提高电铲弱电控制系统防雷及抗干扰能力,对电铲及其他弱电控制系统防雷抗干扰的研究和应用具有积极的现实意义,且有着很好的推广价值。     

油箱壁板裂纹分析

两批油箱壁板在加工完成后,放置一段时间后出现裂纹.通过对故障油箱壁板的裂纹宏观观察、断口的宏微观观察以及裂纹金相分析和材料的性能测试,对壁板裂纹的性质与原因进行了分析.结果表明,两批油箱壁板裂纹的性质均为应力腐蚀开裂,壁板上应力腐蚀裂纹的产生与壁板材料的热处理状态、壁板加工后较高的残余应力以及存放环境中的腐蚀介质有关.     

5000m3液氨球罐缺陷分析

介绍建峰化工总厂化肥厂液氨球罐在进行周检时发现的缺陷及状况。针对不同类型缺陷 ,对其出处、成因按相关标准理论进行详细分析 ,运用规程进行强度校核、评定 ,得出球罐在下一检验周期前仍然安全可靠 ,提出了预防措施和建议     

油罐清洗过程中的安全管理

阐述了油罐在清洗过程中可能出现的各种事故，以及针对各种事故所采取的预防措施，从而从根本上控制油罐清洗过程中安全事故的发生。     

EFFECT OF SUSPENDED FIBRES ON MACRO-MIXING AND MICRO-MIXING IN A STIRRED TANK REACTOR

The effects of suspended fibre on macroscale and microscale mixing in a small stirred tank reactor were studied under batch conditions using the competitive, consecutive azo coupling between 1-naphthol and diazotized sulfanilic acid. The mixing quality was determined from the distribution between the mono and bis substituted reaction products. Nylon (2 and 3 millimeters in length) and fully bleached softwood kraft pulp (FBK) fibre suspensions were examined at volumetric concentrations up to the limit that complete suspension motion could be maintained in the vessel at impellet rotational speeds of 7 and 10s^-1. The adsorption of the product dyes on the fibre was found to be proportional or very nearly proportional to their concentrations in the aqueous phase and did not interfere with the assessment of mixing in the suspension.

Suspended fibres were found to slightly increase the 'critical feed time' of the diazotized sulfanilic acid, corresponding to an increase in the macromixing or bulk blend lime of the vessel. Continued increase in the fibre concentration led to the formation of a well mixed cavern centered on the impeller and the creation of stagnant regions adjacent to the vessel walls. The departure from the Newtonian fibre-free case is due to changes in the flow through and distribution of the energy dissipative regions in the vessel. The most effective location for chemical addition to ensure good microscale mixing remains in the impeller vicinity.     

改进马蹄焰玻璃窑炉加料口设计的体会

我厂总结加料实际运行情况,分析加料口对配合料熔化作业的影响,在仍采用一台(嘴宽为800mm)毯式推料加料机情况下,对24m~2的马蹄焰熔炉加料口结构进行了改进,取得了较好的效果。