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粉体气力输送系统堵塞的原因有哪些?

文章来源: 作者:罗茨机电 发布时间:2021-08-19 浏览次数:1009

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(1)输送母管输送压力降至0.03MPA后,3个输送空气阀先后关闭,本次输送循环结束。这个下限值设置偏高,导致输灰管内部每次输送完后都有残余灰沉积,对下一次输灰造成影响。由此可见,仓泵压力下限值的设定较为重要,一般设定为0.01MPA,若下限值设定较高,则必须加长吹扫时间给予补充,这样才能避免管道中残余灰沉积对下一次输灰造成影响。

(1) After the conveying pressure of the conveying main pipe drops to 0.03mpa, the three conveying air valves are closed successively, and the conveying cycle is ended. This lower limit is set too high, resulting in residual ash deposition in the ash conveying pipe after each conveying, which will affect the next ash conveying. It can be seen that the setting of the lower limit value of the bin pump pressure is more important, which is generally set to 0.01Mpa. If the lower limit value is set higher, the purging time must be extended to supplement, so as to avoid the impact of residual ash deposition in the pipeline on the next ash transportation.

(2)气源压力低,气量不足,使灰气比增大,输送浓度过大,造成管道阻力增大,易发生堵管。

(2) Low gas source pressure and insufficient gas volume increase the ash gas ratio and the transmission concentration is too large, resulting in increased pipeline resistance and easy pipe blockage.

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(3)气源带油、带水造成堵管:气源带油主要原因是空压机油气分离器滤网漏或堵塞,造成气源大量带油。气源带水,干燥剂A/B塔不切换,干燥剂未按期更换,会造成空气中含水量增大,这样造成气源带油、水使灰结块堵塞。

(3) Pipe blockage caused by oil and water in the air source: the main reason for oil in the air source is the leakage or blockage of the filter screen of the oil-gas separator of the air compressor, resulting in a large amount of oil in the air source. The air source carries water, the desiccant A / b tower is not switched, and the desiccant is not replaced on schedule, which will increase the water content in the air, resulting in oil and water in the air source and blocking the ash caking.

(4)沉降灰:沉降灰是指烟气经过未投运的电除尘时,一部分重力大于烟气浮力而降落于灰斗的灰。锅炉点火阶段煤油混烧沉降的灰和电除尘故障停运后沉降的灰。沉降灰一般颗粒粗大,表面粗糙,造成输送事故概率比较高,在输送过程中,灰粒逐渐沉降,易发生堵管,此时应设法降低灰气比。所以锅炉点火时要注意观察除灰设备输送情况,适当进行调整。

(4) Settled ash: settled ash refers to the ash that falls on the ash hopper when the flue gas passes through the electrostatic precipitator that is not put into operation, and part of the gravity is greater than the buoyancy of the flue gas. Ash settled by kerosene mixed combustion in boiler ignition stage and ash settled after electrostatic precipitator fault shutdown. Generally, the settled ash particles are coarse and the surface is rough, resulting in a high probability of transportation accidents. During the transportation process, the ash particles gradually settle and are prone to pipe blockage. At this time, try to reduce the ash gas ratio. Therefore, during boiler ignition, pay attention to observe the transportation of ash removal equipment and make appropriate adjustment.

调整方法:①改变进料时间,控制进入仓泵的灰量,约为仓泵体积的1/3比较合适。②调整助吹阀流量孔板大小,降低灰的浓度(保证补气单向阀的良好,无堵塞和泄漏)。

Adjustment method: ① it is appropriate to change the feeding time and control the amount of ash entering the bin pump, which is about 1 / 3 of the volume of the bin pump. ② Adjust the size of the flow orifice of the blowing aid valve to reduce the ash concentration (ensure that the air make-up check valve is in good condition without blockage and leakage).

(5)灰源的影响:①锅炉点火采用等离子点火,燃料燃尽程度差,飞灰可燃物中含碳量高达30%。大量未燃尽的煤粉进入电除尘器,落入灰斗内。锅炉停运,灰斗内灰未排空即停止气力输送,部分灰残留在灰斗内,加之潮湿冷空气进入,造成灰板结。投运初期启停次数频繁,大量的未燃尽飞灰堆积在灰斗内。缓慢发生氧化反映,蓄积热量到一定程度发生引燃,由于燃烧产生的焦块堵塞下灰通道,灰位越堆越高。

(5) Influence of ash source: ① plasma ignition is adopted for boiler ignition, the fuel burnout is poor, and the carbon content in fly ash combustibles is as high as 30%. A large amount of unburned pulverized coal enters the electrostatic precipitator and falls into the ash hopper. When the boiler was shut down, the pneumatic conveying was stopped before the ash in the ash hopper was emptied, and part of the ash remained in the ash hopper, coupled with the entry of wet and cold air, resulting in ash hardening. At the initial stage of operation, the start and stop times are frequent, and a large amount of unburned fly ash is accumulated in the ash hopper. Oxidation reaction occurs slowly, and ignition occurs when the accumulated heat reaches a certain degree. As the coke block generated by combustion blocks the lower ash channel, the higher the ash level is.


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