维持炉膛负压正常，调整风量至25% ~ 40%之间，进行10分钟炉膛吹扫。
To maintain the furnace negative pressure between normal, adjust the volume to 25% ~ 40%, 10 minutes of furnace purge.
具体介绍了可编程序控制器性能指标，PLC硬件配置，软件设计，编程器，操作方式以及炉膛吹扫，火焰检测及火检原理等。
The specification of programmable controller, PLC hardware configuration, software design, programmer, operation mode and furnace purging flame detection and it principle are presented concretely.
启动风机将空气鼓入加热炉炉膛，使停炉时可能残存炉膛内的煤气吹净，风机吹扫5分钟后方可送气点火。
Start up fan will air into the furnace chamber, make drum boiler stop when the gas chamber may remaining purging and fan blowing off five minutes before commencement of ignition.
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