PLC控制电厂破碎输煤系统.doc

电厂破碎输煤系统PLC控制 摘要：结合SIEMENS S7-200型PLC可靠性高适应性广具有通信功能编程方便,结构模块化的特点以及电厂输煤系统的特殊要求,介绍了PLC在电厂输煤系统中用于联锁控制的程序设计及应用。在S7-200的编程环境中完成系统控制的梯形图编程实现自动化控制。 为了保证输煤系统的正常、可靠运行该系统设计中还应包括主接线的设计，负荷的计算，根据结果选择供电设备。 实现电厂破碎输煤系统的运行，正常停车，紧急停车的功能。启动时按反方向的顺序各个设备通过一定的延时逐一启动。正常停车时按设备的不同要求而设定延时以正方向的顺序停车, 以保证停车时破碎机为空载状态，各输煤皮带上无剩余煤。 运行过程中,当某一台设备发生故障时,应立即发出报警并自动停车,其前方（指供料方向）设备也立即停车。其后方的设备按一定顺序及延时联锁停车。PLC；输煤系统；供电系统；软件编程The power plant system of the crushing and the coal handing be controlled by PLC Abstract： According to the SIEMENS S7-200 light-PLC high reliability and wide adaptability, with communications functions, facilitate programming, modular structure of the characteristics of plant and the special requirements of coal handling system, introduced the PLC in the coal handling system for power plant Interlocking control of the program design and application，In the S7-200 programming environment to complete the ladder system and the automation controller. In order to ensure the normal coal handling system, reliable operation, the system should also include the design of the main wiring design, load calculation, the choice of power supply equipment based on the results. The program implanted the function of the normal parking, emergency stop and the operation of the broken power plant and the coal handling system to finish. When starts, all equipments must be follow the order of opposite direction through a certain delay to start. When normal Parking, all the equipment is settled at the normal order with the different requirements of the direction to delay. To ensure that parking at the Breakers for the empty state, the coal handling belt with the remaining coal. In the course of operation, when a device failure, should be immediately sent alarm and automatically stopping, the front (for materials that direction) equipment immediately stop. The rear of the equipment stopped by a certain sequence and delay chain. Keywords： PLC；Coal handling system；The system of power supply；Software progra