Classifier Systems and Industrial Cyclones工业分选分级系统

Van Tongeren developed three models of air classifier in 1958 using knowledge of air flow gained through the earlier development of cyclones.  The three models were the gravitational, the gravitational inertial, and the centrifugal.  This equipment is used to separate dry particles by size keeping it dry so there is no need to later dry the material for use or transport. The equipment design has few wearing parts.

Van tongeren自1958年起利用自己对旋风分离器大量的研究，开发了三种型号的颗粒分级设备。三种分选分别采用重力分选，重力惯性分选和离心分选的形式。该分选形式根据颗粒的直径大小进行选型，并同时具有一定的干燥作用，分选后无需进行干燥处理，而且设备本体有非常少的磨损部件。

• Gravitational Classifier:重力分选机

Works by passing a current of air through a curtain of falling   material.低速的风从分选机的入口进入分选机， 穿过原料在风出口前面下落形成的灰幕。

• Fines are swept up in the current of air while the coarse material continues to fall out the bottom of the classifier细颗粒在连续风的作用下被吹走，粗颗粒落到分级机底部
• Used to separate fines less than 150 mesh to 150 µm from more coarse material 此类分级机可以针对切割点在150微米以上的颗粒进行分级

• Gravitational – Inertial Classifier:重力惯性分选机

• Works by passing a current of air through a curtain of falling material and then recirculating the entrained fines back through the curtain of material.低速的风从分选机的入口进入分选机，穿过原料在风出口前面下落形成的灰幕。细颗粒随着气流不断循环富集。
• Used to separate fines less between 300 and 36 µm from more coarse material此类分级机可以针对切割点在36微米至300微米的颗粒进行分级

• Centrifugal Classifier离心分级机

• Works by using the centrifugal force on the larger particles to make them flow along the baffles in the classifier. Transport air then passes through a curtain of the circulating particles as the sweep off the baffles edge. A secondary air stream is introduced lower in the classifier to sweep any uncollected fines out of the coarser material
• Used for separating material from 100 microns to 15 µm from more coarse material此分级机可以针对切割点在15微米到100微米之间的颗粒进行分级

Each of the above classifiers can be used in series to split feed into various products. They are generally followed up by a cyclone or bank of cyclones for additional fine particulate removal and then a final piece of particulate removal equipment such as a bag house or cartridge filter to meet the pollution control requirements. 每种分级机可以采用多台串联，以得到不同粒径要求的产品，分级机后面通常会有旋风分离器或者其他的颗粒收集设备，如袋式除尘器等，来满足颗粒物的排放要求。