Recentdevelopments必威体育精装版研究进展.ppt

Recent developments in Pneumatic Conveying 必威体育精装版研究进展 Recent developments in pneumatic conveying The main developments in the last 40 years: 过去40年的主要发展 Reliable dense phase conveying 稳定浓相输送 High pressure rotary valves 高压旋转喂料阀 Approximate ranges of power consumption of pneumatic conveying systems Historical perspective 送料形式 Power requirements for different conveying modes 能耗 Historical perspective 送料形式 Relationship between superficial air velocity and pressure drop Dense phase conveying 浓相输送 Pressure required to maintain movement of a plug of material Dense phase conveying 浓相输送 Relationship between pressure and plug length for continuous and intermittent dense phase conveying Dense phase conveying 浓相输送 Recent developments 必威体育精装版进展 The main developments: Warren Spring Laboratory “Pulse Phase” ‘脉冲相’ Buhler “Takt Schub” Buhler “Fluidstat” Semco “Trace-air” Waeschle “Pneumosplit” Warren Spring Laboratory “Pulse Phase” System ‘脉冲相系统’ The main features: Use of “short plug” principle 短栓 Mass flow blow tank (for uniformity of powder delivery) 整体流动送料罐 Air knife (to generate discrete plugs of material) 气刀 Warren Spring Laboratory “Pulse Phase” System ‘脉冲相系统’ Operation Product introduced to blow tank Blow tank full – shut inlet valve Open outlet valve – material enters pipeline Plug of material passes air knife Timer modulates air flow to “knife” When air is on, plug is detached and transported forward When air to knife is off, material flows forward again Features Aeration to conical blow tank to aid flow into pipeline and subsequent splitting Claimed air consumption 1/40th dilute phase and ? dense phase – reduced costs for use of inert gases Target materials: cohesive, free-flow or coarse Warren Spring Laboratory “Pulse Phase” System ‘脉冲相系统’ Buhler “Takt-Schub” System 气栓 The main features: Use of “short plug” principle Intermittent air supply to conveying line Buhler “Takt-Schub” System Operation Product introduced to blow tank Blow tank full – shut inlet valve Open ou