熱電廠輸煤裝置的智能傳送控制系統(tǒng)外文翻譯(編輯修改稿)
2024-09-10 11:17 本頁面
【文章內(nèi)容簡介】 l CHP operation requirement. At maximum places the simple relay control system with old style mechanical sensing devices are used. For fulfilling the requirement Electronic intelligent conveyor control system has developed. This system will take all the constraints of old system and also having additional feature like feed rate control. 2 Existing Control System:The existing system has sensing device like zero speed sensing, receiving conveyor position sensing. It has also facility for selection to operate conveyor avoiding control system . manual run mod. In some CHP there is facility of three type of selection. One is for start or stop plant with auto mode. In this mod each conveyor will operate sequentially after selecting the stream. Second which is in all CHP for start or stop of plant with manual mode. Third is operating the system without any protection or interlock. Operating Principle:Before starting conveyor system it is necessary to start first receiving conveyor and then start feeding conveyor . operating logic is from down stream to upstream. For stopping of conveyor system the operation will be opposite . from upstream to down stream. So it is necessary if any conveyor is stopped in the system all the upstream conveyor should stop automatically. The existing system takes care of this logic. This is known as conveyor sequential operation. If due to any problem the rotation of conveyor bees slow or towards zero its necessary to stop the conveyor. This is known as zero speed protection. Existing system takes care of it and stops the conveyor and further stop the upstream system sequentially. The dust suppression system should be operating when there is coal flow. This is done by sensing via simple mechanical under belt switch. The measurement of coal flow is done by using load cell. The block diagram of shown in figure no 1 will give idea about control system. Figure No 1For dust suppression system the spray header will be on when the contact of under belt switch is true and motor is in on. This two no of sensing is taken to avoid spraying when conveyor is not rotating but contact of under belt switch is true due to coal is laying on belt. Draw Back Of Existing System:The main problem of this system is required to keep continuous watch on each conveyor current because of choking of transfer chute or jamming of conveyor. Many times it is required to reduce the feeding rate by adjusting feeder to reduce the current of conveyor. When current es to normal again it is tried to establish the required feed rate, if it is not again establish by stopping the conveyor system the problem is identify and attended. This problem
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1