电厂输煤系统设计

摘要

电厂输煤系统是火电厂的重要组成部分，属于公用系统，其安全可靠的运行是保证电厂实现安全高效不可缺少的环节。输煤系统的工艺流程随锅炉容量、燃料品种、运输方式的不同而差别较大，并且使用设备多，分布范围广。

传统的火电厂输煤系统，是基于继电器设计的人工控制半自动系统。通常输煤系统现场工作环境恶劣，手动控制方式不利于工作人员身体健康。而且随着电厂单机容量和装机容量的不断扩大，输煤系统会发生诸如皮带跑偏等设备故障，给工作人员的检修与维护带来了极大不便。

本次设计采用的以PLC为控制方式的电厂输煤控制系统。不仅具有抗干扰性强、稳定性好、精度高的优点还实现了输煤系统自动化控制。系统配套的相关传感器和电路保护设备不仅可以实时监控系统各环节运行状态，还可以在紧急情况下可以紧急停车。设计方案与传统以继电器为主的控制系统相比控制功能强、编程简单、易于维护，为工作人员的生产检修都带来了极大的方便。

关键字：输煤系统；可编程控制器；自动

Abstract

Power plant coal handling system is an important part of the thermal power plant, belonging to the public system,which is to ensure the safe and reliable operation of the power plant safety and efficiency indispensable link.Process Handling System with the boiler capacity,fuel type,different modes of transport vary greatly,and the use of equipment and more widely distributed.

Traditional thermal power plant coal handling system is based on semi-automatic manual control system relay design.Coal handling system generally harsh environment field work,manual control mode is not conducive to the health of workers.And with the continuous expansion of the installed capacity of power plants and stand-alone capacity,coal handling system will occur as the belt deviation and other equipment failures,to repair and maintenance staff brought great inconvenience.

The design uses a PLC to control the mode of power plant coal handling control system.Not only has strong anti-interference,good stability,high precision advantages of coal handling system also enables automatic control.System supporting the associated sensors and circuit protection devices can not only run all aspects of real-time monitoring system status,it can also be an emergency stop in case of pared with the traditional design with relay-based control system control functions,programming is simple,easy to maintain,for the production of maintenance staff have brought great convenience.

Keywords:Ｃoal handling system；PLC；A utomatic

目录

一、设计任务 (1)

二、设计目的 (1)

三、设计要求 (1)

四、现状分析 (1)

五、输煤系统 (2)

六、系统设备 (2)

6.1翻车机系统 (2)

6.2斗轮机 (2)

6.3碎煤机 (2)

6.4皮带机 (3)

6.5给煤机 (3)

6.6滚轴筛 (3)

6.7辅助设备 (3)

七、设备布置 (4)

7.1卸煤系统 (4)

7.2储煤系统 (4)

7.3上煤系统 (4)

7.4配煤系统 (4)

八、输煤流程 (5)

8.1正常输煤流程(默认甲线) (5)

8.2甲线储煤故障备用流程 (5)

8.3上煤系统故障备用流程 (6)

8.4甲线配煤系统故障备用 (6)

九、保护配置 (6)

9.1电气设备短路保护 (6)

9.2电气设备过载保护 (7)

9.3皮带机的保护 (7)

十、电气选型 (7)

十一、电气主电路设计 (8)

11.1卸煤系统主电路设计 (9)

11.2储煤系统主电路设计 (9)

十二、电气控制电路设计 (11)

12.1配煤控制系统 (11)

十三、PLC设计 (13)

十四、电路测试 (13)

十五、设计心得体会 (18)

致谢 (19)

参考文献 (20)

附录 (21)