热载体与生物质半焦散体颗粒的分离特性研究

Separation Characteristics of Heat Carrier and Biomass Particles

在以固体热载体加热实现生物质快速升温热解液化工艺中,热载体与热解半焦颗粒的分离极为重要。为了研究陶瓷球热载体与生物质半焦颗粒的分离过程,设计制作了V型下降管冷态实验装置,并利用粒子图像测速仪对不同质量比(30:1,40:1,50:1,60:1)、圆形出口和方形出口条件下的颗粒分离规律进行了实验研究。研究表明,该装置能够保证热载体和生物质半焦颗粒喂料流畅、稳定且均匀,能够满足实验所需要的两种颗粒的不同混合质量比的要求;陶瓷球对生物质半焦颗粒的携带作用明显,受生物质半焦颗粒影响水平流动速度、轨迹的高度和射程减少50%左右;管口下底面与筛网的竖直高度应大于20mm,水平距离应大于32mm,筛网的水平投影长度应大于120mm,分离效果较好。

The new type down flow tube pyrolysis reactor was used for the biomass fast pyrolysis,using ceramic balls mixtured with dolomite catalysts as heat carrier.During pyrolysis process,ceramic balls and chars mixture was formed in which the ceramic balls can be recycled.It＇s necessary to use a well-seperated device to seperate ceramic balls from the mixture,the seperation device is an indispensable part of the pyrolysis system.In order to investigate the seperation mechanism between heat carrier and biomass,a new type down flow tube was designed and made to simulate the industry device.Experimental results showed that this device can ensure ceramic balls and biomass be feed smooth,stable and uniform,can satisfy the different mass ratio of the ceramic balls and biomass,the PIV results show this device can satisfy expermental requirement.