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滚筒干燥设备,大处理能力和高蒸发负载

信息来源: | 发布日期: 2013-01-18 | 浏览量:
关键词:滚筒干燥设备

滚筒干燥设备,大吞吐量和高蒸发负载。

操作:
旋转的级联机有进料穿过旋转的缸体的热气体流一起。内部挺杆或航班提升饲料和拖放在窗帘从顶部至底部级联沿干燥器的长度。航班需要精心设计,以防止不对称的窗帘。材料从干衣机的一端移动到其他的材料,由于在滚筒的倾斜的角度下降由运动。一些旋转干燥器是双重和三重合格单位,每个鼓嵌套在前面的鼓。

旋转的百叶板机有进料支持和移动超过一组安装到外部的旋转鼓的格栅。低于进料环的锥形喧嚣的热气体被引入。的百叶窗,然后从干燥器排出的产品之前,空气通过。所述滚筒的旋转导致滚动和混合与干燥气体提供紧密接触的材料。从干衣机的一端移动到其他的材料的轧件,一些流态化和由于在滚筒的倾斜的角度的运动。

进料/放电:
自动和连续的。电动按摩棒,螺旋给料机,旋转气闸,双瓣阀,重力槽

饲料特点:
粉剂,颗粒剂,非易碎的附聚物,大固体颗粒。由低到高的进给率

热源:
蒸汽,电力,煤炭,液体燃料,或气体

曝光:
大多直接。流的级联机顺流或逆流。流是一种通过床层,交叉,合作电流或逆流用于旋转的叶片组合。

停留时间:
可控。停留时间可改变通过改变所述滚筒的旋转的速度和鼓角。填充可以变化。填充通常之间的感光鼓的横截面面积的7%至25%的。

提取:
通常情况下引起的。系统可以燃烧,强迫和诱导风机进行操作。

除尘:
旋风,布袋除尘器,洗涤器,静电除尘器。系统需要收集灰尘。

控制:
PLC,很少固态控制器。系统控制排气温度。可以调节能量和饲料。

优点:
高通量
低成本 - 高百叶窗
温和的处理百叶窗机
非常亲密的接触产品的百叶窗机
健壮
可以处理在饲料中的变化,虽然产品可能是不一致的
高温作业 - 耐火内衬。
单位可以有整体的散热部分。

限制:
堵塞虽然链,门环将减少
可能会导致由于磨损和冲击的大小减少
干燥后的产品特性不一致
差的能源效率 - 高损耗级联单元
不良的热传导级联单元
高昂的维修费用
大型房地产
许多组件磨损
没有隐式灰尘分离

ROTARY DRYERS
Large throughputs and high evaporative loads.

Operation:
Rotary cascade dryers have the feed materials pass through a rotating cylinder together with a stream of hot gas. Internal lifters or flights elevate the feed and drop it in a curtain from the top to the bottom cascading along the length of the dryer. Flights need to be carefully designed to prevent asymmetry of the curtain. Material moves from one end of the dryer to the other by the motion of the material falling due to the angle of inclination of the drum. Some rotary dryers are double and triple pass units where each drum is nested inside the previous drum.

Rotary louver dryers have the feed materials supported and moving over a set of louvers mounted to an external rotating drum. The hot gas is introduced into a tapered bustle below the feed ring. The air passes through the louvers and then the product before being exhausted from the dryer. The rotation of the drum causes the material to roll and mix providing intimate contact with the drying gas. Material moves from one end of the dryer to the other by the motion of rolling, some fluidization and due to the angle of inclination of the drum.

Feeding / discharge:
Automatic and continuous. Vibrators, screw feeders, rotary airlocks, double flap valves, gravity chutes

Feed Characteristics:
Powders, granules, non friable agglomerates, large solid particles. Low to high feed rates

Heat Source:
Steam, electrical, coal, liquid fuels, or gas

Exposure:
Mostly Direct. Flow is co-current or countercurrent for cascade dryers. Flow is a combination of through the bed, cross, co-current or countercurrent for rotary louver.

Residence time:
Controllable. Residence time can be altered by varying the speed of rotation of the drum and the drum angle. Fill can be varied. Fills are typically between 7% and 25% of the cross sectional area of the drum.

Extraction:
Normally induced. Systems can have combustion, forced and induced draft fans for operation.

Dust Collection:
Cyclones, baghouses, scrubbers, Electrostatic precipitators. Systems require dust collection.

Control:
PLC, infrequently solid state controllers. System controls on discharge temperature. Can modulate energy and feed.

Benefits:
High throughput
Low cost - Higher for Louver
Gentle handling for Louver dryer
Very intimate product contact for louver dryer
Robust
Can handle variations in feed although the product may be inconsistent
High temperature operation - can be refractory lined.
Unit can have integral cooling section.

Limitations:
Clogging although chains and knockers will reduce this
May cause size reduction due to attrition and impact
Inconsistent dried product characteristics
Poor energy efficiency - high losses in cascade units
Poor heat transfer in cascade units
High maintenance
Large real estate required
Many wear components
No implicit dust separation

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