密相输送
气力输送系统的形式与类型 (Type of PCS)
Most advanced dense phase pneumatic conveying system conveys bulk solid materials at a much slower velocity than traditional dilute phase pneumatic conveying system. Unlike dilute phase conveying, in which all the solid particles are suspended in a high speed gas stream, dense phase conveying moves material in a much slower and more concentrated manner, especially along the bottom of the pipeline. The dense phase system will be designed to move material in a strand, slug / plug or fluidized mode depending on the nature of the material and the plant configuration.
The dense phase and/or medium phase conveying method is typically capable of higher conveying rates and longer conveying distances. Usually higher capacity and higher conveying pressure dense phase system will need our specially designed primary pipe supports to absort the piping vibrating force during the product plug hitting the pipe bends.
与传统的稀相气力输送相比，先进的密相输送系统技术采用低得多的输送气流速度。在稀相输送过程中，固体颗粒全部以悬浮的状态随着高速气流被输送，而密相输送则是以很慢的速度、集中推进料堆、料栓或管道底部的料床。设计密相输送物料究竟是以料堆、料栓还是料床推进，取决于物料颗粒的自然属性以及整个系统的其它组合条件。
通常密相输送及中相输送能够适合更高的输送能力和更长的输送距离。通常较高输送能力、较大输送压力的密相输送系统，需要配备康柏斯特别设计的管道防振支撑，以消除或吸收由于输送料栓撞击输送弯头时产生的振动。
Dense phase conveying is ideal for bulk solid materials that are abrasive, friable, tend to segregate, temperature sensitive, premixed materials or materials with higher bulk densities. Dense phase conveying is optimal for fine bulk solids such as fluidizable fine powders or for larger particles like beads, coarse granule, pellets, coffee beans or pet food.
密相输送技术十分适合高磨损性、易碎性、易离析、对温度敏感、混合后的物料，以及更高堆积密度的物料。密相输送无论对于很细的可流化粉料，以及较大的珠粒、粗粒料、切粒颗粒、咖啡豆或者宠物食品颗粒都是非常理想的选择。
A Compass dense phase system can be either a pressure conveying system or a vaccum conveying system. Materal pickup can be either a rotary valve station, a blow tank (pressure vessel) or a pick up nozzle / wand.
康柏斯密相输送技术即可以应用到正压输送系统，也可以应用到负压输送系统。物料输送起点既可能是旋转阀输送站，也可能是发送罐或负压吸嘴。
Advantages of Dense Phase 密相输送的优点
- Very low conveying speed means much lower power consumption than dilute phase, energy saving 30% ~ 50% or more
- Maitain product quality and particle size distribution, aviod segregation
- Avoid fines production (and angel hairs or streamer for plastic products), very low product loss in form of dust, only 1% ~ 10% vs dilute phase
- Eliminate product fines build-up on walls/bends
- Reduce system wear when handling abrasive products
- Reduce noise levels generated by the conveying piping, 10~25dBA noise less than dilute phase
- Reduce gas consumption when, for instance, conveying with nitrogen
- Combining dilute phase technology during pipe purging clean cycle when necessary
- Capable of high conveying rates and long distances
- Reliable & long working life – Compass dense phase systems have additional safety factors built in to ensure reliable performance and reduce maintenance providing a long life cycle.
- 很低的输送速度意味着较低的输送能耗，与稀相输送相比节省30%~50%甚至更高
- 保持输送物料的品质和粒度分布，减少物料离析
- 减少输送磨损物料导致的细粉产生（以及减少塑料物料输送过程中的拉丝产生），节省物料损失，粉尘产生量只有稀相输送的1%~10%
- 减少细粉粘附在管道内壁
- 输送磨损性物料时减少管道弯头及设备磨损
- 减少输送噪音（管道内物料输送噪音通常比稀相低10~25dBA）
- 密相输送技术包含了稀相输送技术，在必要的管道吹扫清理阶段以稀相方式吹扫
- 适合更大的输送能力和更远的输送距离
- 可靠和稳定地长期工作，康柏斯密相输送系统特别考虑了更高的安全系数，确保可靠安全工作，减少维护需求同时长周期工作寿命
a Compass 80tph HDPE pellets dense phase conveying plant site, since 2005
一套康柏斯密相输送聚烯烃装置现场照片，HDPE颗粒，80吨/小时, 2005
