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Young Planting

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大流量高落差卸料解决方案

大流量高落差卸料方案
1.    行业痛点
1.1.    大流量高落差卸料场景的特点
1.1.1.    高落差
抛料点到物料堆面垂直落差通常超过20米,为降低破碎率需采取措施逐级降低物料下落速度。
在港口、矿山等环境中,散装物料的装卸高度差较大,物料在下落过程中容易破碎,导致物料损耗增加,同时也会产生大量粉尘。
1.1.2.    大流量
部分装船机处理能力可达3000m³/h,需保证连续作业的稳定性和效率。
高流量的物料装卸对设备的稳定性和效率提出了更高的要求,设备需要能够长时间稳定运行,同时保证物料的连续输送。
1.1.3.    宽幅流量
作业时物料流量在较大范围内波动(以1000t/h的散粮装船机为例,作业流量为500~1000t/h)。
物料流量的波动对设备的适应性提出了挑战,设备需要能够根据流量的变化自动调整,以保证物料的稳定输送。
1.2.    针对大流量高落差卸料场景的特点,传统伸缩溜筒的缺点
1.2.1.    传统直筒式伸缩溜筒的缺点
1.2.1 Drawbacks of Straight-Tube Telescopic Chutes
1.2.1.1. 皮带输送机头部抛料点与溜筒顶部之间诱导气流过大,导致粉尘扩散严重。
1.2.1.2. 筒节间隙密封工艺不成熟,粉尘扩散严重。
1.2.1.3. 设备收缩和伸展不流畅,发易生卡顿。
1.2.1.4. 减速降破碎工艺不成熟,物料破碎率超标,且加装减速装置后,伸缩溜筒完全收缩后长度太大,且伸缩行程相对较小。

1.2.2.    传统锥斗式伸缩溜筒的缺点

正锥斗式伸缩溜筒

偏心锥斗式伸缩溜筒

1.2.2.1. 依赖大功率负压除尘器,能耗过高。
1.2.2.2. 部件易损坏(如防护罩脱落、锥斗断裂),维护成本高。
1.2.2.3. 设备稳定性差,易发生歪斜、偏心、卡顿。
1.2.2.4. 系统多部位诱导气流过大(皮带机头部抛料点与溜筒顶部之间,溜筒出口密封挡帘与堆料面的间隙处),导致粉尘逸散严重。
1.2.2.5. 多采用机械式料位计,易发生预警延迟及误报,造成防尘罩内完全积料,进而导致锥斗吊装钢丝生断裂及防尘罩脱落。
1.2.2.6. 减速降破碎工艺不成熟,物料破碎率超标。
1.2.2.7. 加装无动力抑尘设备后,扬尘大且随料流波动易产生谐振。

2.    大流量高落差卸料解决方案-案例
2.1.    痛点与解决方案
以某港口1000t/h散粮装船机为例(物料:玉米),落差24米(皮带机抛料点到船舱底部最大高度),装船机上原装配伸缩溜筒为偏心锥斗式,作业时存在扬尘大,粮食破碎率高、维护费用高、伸展及收缩过程中已发生卡顿等问题,解决办法是换装直筒式多级组合式无动力抑尘伸缩溜筒系统总成。

2.2.    实施效果

1000t/h装船机改装直筒式多级组合式
无动力抑尘伸缩溜筒系统总成后的综合效益分析表

 
 

项目

改造前
(负压除尘器)

改造后
(无动力抑尘)

提升幅度

节省运营成本
(万元)

 
 

粉尘排放浓度,mg/m³

150

15

环保达标

——

 

粉尘排放量,吨/年

400

50

降低75%

90.0

 

破碎率,%

1.3

0.6

降低54%

——

 

年综合能耗,万度电

10

0

节能率100%

9

 

设备维护成本,万元/年

12.0

0.5

降低95%

11.5

 

节省运营成本合计,万元

110.5

 

改造成本(含设备及改造费用),万元

50.0

 

投资回收周期=50/110.5*12=5.4个月

 

备注:
①作业量50万吨/年,物料:玉米;
②粉尘扩散率:改造前0.8‰,改造后0.1‰;

 
 

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