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粉體氣力輸送系統堵塞的原因有哪些?

文章來源: 作者:羅茨機電 發布時間:2021-08-19 瀏覽次數:1692

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(1)輸送母管輸送壓力降至0.03MPA后,3個輸送空氣閥先后關閉,本次輸送循環結束。這個下限值設置偏高,導致輸灰管內部每次輸送完后都有殘余灰沉積,對下一次輸灰造成影響。由此可見,倉泵壓力下限值的設定較為重要,一般設定為0.01MPA,若下限值設定較高,則必須加長吹掃時間給予補充,這樣才能避免管道中殘余灰沉積對下一次輸灰造成影響。

(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)氣源壓力低,氣量不足,使灰氣比增大,輸送濃度過大,造成管道阻力增大,易發生堵管。

(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)氣源帶油、帶水造成堵管:氣源帶油主要原因是空壓機油氣分離器濾網漏或堵塞,造成氣源大量帶油。氣源帶水,干燥劑A/B塔不切換,干燥劑未按期更換,會造成空氣中含水量增大,這樣造成氣源帶油、水使灰結塊堵塞。

(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:沉降灰是指煙氣經過未投運的電除塵時,一部分重力大于煙氣浮力而降落于灰斗的灰。鍋爐點火階段煤油混燒沉降的灰和電除塵故障停運后沉降的灰。沉降灰一般顆粒粗大,表面粗糙,造成輸送事故概率比較高,在輸送過程中,灰粒逐漸沉降,易發生堵管,此時應設法降低灰氣比。所以鍋爐點火時要注意觀察除灰設備輸送情況,適當進行調整。

(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.

調整方法:①改變進料時間,控制進入倉泵的灰量,約為倉泵體積的1/3比較合適。②調整助吹閥流量孔板大小,降低灰的濃度(保證補氣單向閥的良好,無堵塞和泄漏)。

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)灰源的影響:①鍋爐點火采用等離子點火,燃料燃盡程度差,飛灰可燃物中含碳量高達30%。大量未燃盡的煤粉進入電除塵器,落入灰斗內。鍋爐停運,灰斗內灰未排空即停止氣力輸送,部分灰殘留在灰斗內,加之潮濕冷空氣進入,造成灰板結。投運初期啟停次數頻繁,大量的未燃盡飛灰堆積在灰斗內。緩慢發生氧化反映,蓄積熱量到一定程度發生引燃,由于燃燒產生的焦塊堵塞下灰通道,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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