基于plc及变频器连续输灰改造项目.docVIP

基于S7-300 PLC燃煤锅炉机组电除尘气力输灰系统设计 摘 要 本文介绍#5-#7燃煤锅炉电除尘连续气力输灰改造项目，本项目共3台锅炉12个灰斗，其中240t/h锅炉1台，130t/h锅炉2台；每个灰斗下各配置1台连续输送泵，12台连续输送泵，设3条管道输送至灰库内。采用低压气力连续输送系统，以罗茨风机和连续输送泵为核心设备，配套其它设备包括落灰管，输灰管道，阀门，灰库顶部的除尘器、库底的干灰加湿机、散装机，灰库流化系统和灰库料位计等，本工程一台布袋除尘器为一套独立输送系统，灰库及灰库设备共用。灰库的其他设备均可独立运行，与输送系统没有联锁关系。气力输灰系统采用较为先进的可编程序控制器（Programmable Logic Controller 简称PLC）集中控制，分为自动控制、远方集中手动控制和就地手动控制三种控制方式，自动控制程序方式采用西门子S7-300 PLC结合步科ET100触摸屏实现设备启停、监视、运行数据和故障报警信号的采集自动化，便于运行数据自动分析和故障判断，并对系统中的故障实现分类报警。系统分为连续运行和优化运行两种自动运行方式。优化运行是指锁气器在灰斗高低料位信号时自动延时启动停止运行。连续运行是指锁气器连续运转，不受灰斗料位影响。 关键词： 连续气力输灰系统；西门子S7-300 PLC；步科ET100触摸屏；变频器 Design of pneumatic ash conveying system for coal fired boiler unit based on S7-300 PLC Abstract The #5-#7 coal-fired boiler precipitator continuous pneumatic ash transformation project in this paper, the project a total of 3 boilers 12 ash hopper, wherein 240t/h boiler 1 units, 1 units each of 240t/h boiler; ash bucket each configuration 1 continuous conveying pump, 12 continuous pump, 3 pipeline to the ash storehouse. With the continuous low pressure pneumatic conveying system, the roots blower and continuous conveying pump as the core equipment, supporting other equipment including ash falling pipe, ash conveying pipe, valves, ash storage at the top of the dust collector, the bottom dry ash humidifying machine, bulk machine, ash storage fluidization system and ash base material level meter. The project of a dust collector for a set of independent transportation system, ash base and ash storage equipment Co. Other equipment can be run independently, and there is no interlocking relationship with the conveying system. The use of more advanced PLC pneumatic ash conveying system (Programmable Logic Controller referred to as PLC) is divided into centralized control, automatic control, remote manual control and manual control three control mode, automatic control program using SIEMENS S7-300 PLC with Eview ET100 touch screen to achieve the equipment start and stop, mon