天然气多孔介质预混燃烧污染物排放实验研究

对天然气在双层多孔介质燃烧器中预混燃烧烟气中污染物(一氧化氮、二氧化氮、一氧化碳)体积分数进行实验测量,实验采用不同的热功率(5.0、6.0、6.5 kW)、当量比(0.40～0.91)、粒径组合(1.0 mm与3.0 mm、1.5 mm与3.0 mm).根据实验结果,对热功率、当量比、粒径组合对多孔介质预混燃烧烟气中污染物体积分数的影响进行了分析.     

LPG钢瓶自闭式直立阀调压器组性能研究

介绍液化石油气(LPG)钢瓶角阀调压器组、自闭式直立阀调压器组的结构。实验分析自闭式直立阀调压器组的调压性能,对LPG钢瓶分别配置自闭式直立阀调压器组、角阀调压器组时,3种灶具(辐射型加热面燃烧器、条状火孔燃烧器、圆火孔燃烧器)的火焰状态、热效率进行实验对比。     

扭带管内高湿空气对流凝结换热三维数值模拟(英文)

A three-dimensional numerical model is presented for studying the convection-condensation of mixture with vapor in a tube with edgefold-twisted-tape inserts under transition flow.According to the diffusion layer theory and laminar species transport,a condensation model with user defined function is proposed and compared with heat and mass transfer analogy and experimental test.With the condensation model,the influences of gap width and op-erating parameters on thermal-hydrodynamics performance are simulated.As the gap width increases,convection and condensation heat transfer increase initially and then decrease,while convection heat transfer increases sharply and then decreases slightly.Increasing vapor fraction has a significant effect on condensation heat transfer but it has little effect on convective heat transfer.With the increase of inner wall temperature both convection and condensa-tion heat transfer all decrease and the ratio of condensation to total heat decrease dramatically.Increases inlet tem-perature mainly affects convection heat transfer.     

金华市农机服务产业化及其发展探析

在总结金华市农机服务产业化发展现状的基础上,分析了金华市农机服务产业化发展中存在的问题,提出了推进金华市农机服务产业化发展的措施与对策.     

天然气输配系统输气能力提升

郑州市中心城区燃气输配系统存在压力级制单一、中压管网满负荷运行、输配系统规模不匹配等问题,造成了中心城市部分区域供气压力较低。通过对输配系统进行梳理,采用"次高压入市+中压管网优化"等方案对郑州市中心区域输配系统输配能力进行提升。