熱電廠輸煤裝置的智能傳送控制系統(tǒng)外文翻譯-資料下載頁
2025-08-14 11:17本頁面
【正文】 . W(ct). …… 4. The current transformer Mc senses the current drawn by motor. Let Em = equivalent output voltage with reference to motor current transformer Mc . = Transfer function, it depends on the type of regulating system. The parator Cml pare current transformer output signal with out put signal of parator of weighbridge (Wb) Let Eml = out put voltage of parator Cml, Kml = the constant, W(ml) = the feed rate of coal per motor power Then Eml = Kml . W(ml). …… 5. And Eml = Ect / Em Sml = Eml …… As the out put voltage of parator is same as feed back signal. Putting value in 5. Sml = Kml . W(ml). …… 6. The feed rate is to be decided and then it is to be set for controller by adjusting pot position. The speed of feeder is change as per feedback received from weighbridge. Then at same time feedback is received for feed rate per motor power. As the feed rate per motor power is reduced the speed of feeder will be reduced and will protect the system. At the same time it will alert the operator by blowing alarm. The block diagram shown in figure no 2 will give idea about the same. Figure No 2For spraying the water on the belt the signal will receive from the weighbridge. As flow of coal is established the no of nozzles mounted on belt will operate in proportion to the coal feed rate. The feedback will take by measuring dust emission and corrective action will be taken. See figure no 3. Let SR1 = Reference signal, SE1 = Error signal, SF1 = Feed back signal, SO1 = Out put signal (for no of nozzle opening), From 4 SF1 = SF = Kct . W(ct) …… 7.For measuring the dust emission the Sensitive phototransistor type device used. This device Md will transfer signals. Let Emd = out put voltage Md, Kmd = the constant, W(md) = dust emission rate. Then Emd = Kmd . W(md). …… 8.Smd = Emd …… As the out put voltage of parator is same as feed back signal. Putting value in 8. SF1 = Kmd . W(md). …… 9. Figure No 3This two controller will ensure the conveyor system operation very smooth. The block diagram shown in figure no 4 will give clear idea about this system. Using analog to digital converter all the data can be easily recorded in puter. Figure No 44 Conclusion:The system suggested is easy to install. The system is having greater reliability and protection. The system does not require any plicated sensors. All the drawbacks of existing system are removed in the suggested system. Reference:1. Technical paper on “Failure of Dust Suppression Systems in Coal Handling Plants” by Makarand Joshi, in MNews Edition 19 of Plant Maintenance Resource Center [Industrial Maintenance Portal] at web site 11
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