EXPERIMENTAL STUDY OF GAS—SOLID SUSPENSION FLOWS IN VORTEXING FLUIDIZED BED CHAMBER FREEBOARD

Gas flows and particle mass flux were measured and clutriation experimentswere conducted in two cold test models of vortexing fluidized bed(VFB).The experimen-tal results show that the secondary air injected tangentially creates strong vortexes,estab-lishes particle suspension layers and internal circulation,and suppresses the elutriation offine particles greatly.The vortexing fluidized bed combustion has bright prospect bccauseof its much higher combustion efficiency and desulphidation efficiency than bubblingfluidized bed combustion due to long particle residence time and high slip velocity betweengas and solid,and its simpler configuration and lower cost than circulating fluidized bedcombustion.     

活性炭的自燃危险性及其安全运输

本文通过分析活性炭的自热特性,确认所有蒸汽活性炭的自燃危险性很小。就海运目的而言,认定蒸汽活性炭在海上运输过程中不作易自燃危险货物运输;对化学活性炭和半成品,须要进行一个简单的“炭的自热试验”,从而确定其是否具有潜在的自燃危险性。     

Experimental study on premix combustion at isosceles triangle type rate of heat release for squish type combustion chamber

This paper presents a theory on premix fuel combustion at near isoceles triangle type rate of heat release, describes the measures taken for the combustion system, points out its many theoretical advantages, and that it can solve effectively the problems of rough running, fuel consumption and exhaust emission. Two squish lip type combustion chambers are designed to match separately with multiple holes injector and conical spray type injector in order to achieve premix combustion at near isosceles triangle type rate of heat release. Experimental studies on two single cylinder diesel engines showed that premix combustion at isosceles triangle type rate of heat release resulted in longer ignition delay period, larger amount of fuel injected into cylinder during the ignition delay period, lower maximum pressure, better fuel economy, and better exhaust emission.     

脂肪酮燃烧热和生成热与分子结构关系的探讨

本文用图论方法探讨了气态脂肪酮的燃烧热和生成热与分子结构的关系,提出了一个结构基础明确的定量关系。计算结果表明,脂肪酮燃烧热和生成热计算值与实验值的一致性令人满意。应用本文定量关系,不仅能够预测脂肪酮的燃烧和生成热,而且能够合理表征物质结构与性能之间的关系。     

非离子表面活性剂对乳化柴油性能的影响

以柴油为原料，采用非离子表面活性剂聚乙二醇辛基醚(OP—15)作为主乳化剂，以脂肪酸二乙醇酰胺和山梨糖醇酐单油酸脂(Span—80)为辅乳化剂，对掺水柴油乳状液的配制条件进行实验，确定了不同用量的乳化剂形成W／O型乳液时的最大掺水量，同时考察了不同的燃烧条件下掺水柴油乳液的燃烧性能。     

高炉热风炉燃烧控制系统

高炉热风炉燃烧控制系统通过改造，对实现高炉燃烧过程的稳定性、经济性、合理性，起到了一定的效果。文中重点叙述了在线系统的硬件配置及软件编制思想，同时指出了系统仍然存在不足与今后改进的方向。     

Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system

INTRODUCTIONTheinternalcombustionengineisthemostwidelyusedpowermachineryinmodernsociety ,butisalsooneofthebiggestenvironmentalpol lutantsources.Tomeetmoreandmorestringentemissionrequirements,manyadvancedtech niques,suchastheleanburntechnique ,multi valvet…     

不同气氛和素坯密度对燃烧合成Ti_3AlC_2粉体的影响

实验结果表明 ,Ti:Al:C =2 :2 :1(摩尔比 )体系燃烧合成Ti3AlC2 的环境气氛若为真空 ,燃烧产物主要为TiC ,若为氩气 ,燃烧产物主晶相为Ti3AlC2 ;增加反应物原料的素坯密度 ,可较大程度地提高燃烧产物中Ti3AlC2 的含量。     

Three-dimensional transient numerical simulation for intake process in the engine intake port-valve-cylinder system

This paper presents a KIVA-3 code based numerical model for three-dimensional transient intake flow in the intake port-valve-cylinder system of internal combustion engine using body-fitted technique, which can be used in numerical study on internal combustion engine with vertical and inclined valves, and has higher calculation precision. A numerical simulation (on the intake process of a two-valve engine with a semi-sphere combustion chamber and a radial intake port) is provided for analysis of the velocity field and pressure field of different plane at different crank angles. The results revealed the formation of the tumble motion, the evolution of flow field parameters and the variation of tumble ratios as important information for the design of engine intake system.     

小型风冷柴油机冷起动试验研究

文章分析了影响柴油机冷起动性能的因素及涡流燃烧室最佳结构参数匹配 ,在不采用外加辅助措施的前提下 ,从改进涡流主副燃烧室的连接通道的形状、起动孔的锥度的大小及位置、燃烧室的形状着手 ,以保证在 - 2℃的低温下 ,柴油机能够顺利起动并且其性能指标 (功率、油耗、烟度、噪声等 )不低于改进前的性能指标 ,我们在 15 5F和CZ16 5F柴油机上进行对比试验 ,达到了预期的效果 .