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1. 发明申请

WO2012152986A1 METHOD AND APPARATUS FOR CONTROLLING THE TRACE HEATING OF A PIPE 审中-公开
标题翻译：用于控制管道跟踪加热的方法和装置
公开(公告)号：WO2012152986A1
公开(公告)日：2012-11-15
申请号：PCT/FI2012/050354
申请日：2012-04-11
申请人： PLANRAY OY , PIIRAINEN, Aarni , PIIRAINEN, Toni
发明人： PIIRAINEN, Aarni , PIIRAINEN, Toni
IPC分类号： H05B1/02 , H05B3/56 , F17D1/18 , G05D23/19
CPC分类号： H05B3/56 , F16L53/38 , H05B1/0244
摘要： The invention relates to a method and apparatus for controlling the trace heating of a pipe. The material conveyed in the pipe is heated with a heating cable (2) attached to the pipe and the temperature of the pipe (1) is monitored by a temperature sensor (5) attached to the pipe, on the basis of which measurement data is controlled the supply of electricity to the heating cable. The rate of change of the temperature indicated by the temperature sensor (5) is monitored by means of a program-controlled processor (7) and the rate of change is compared with a predetermined reference value. If a fall in the temperature is observed which is more rapid than the predetermined rate of change, or if despite heating with a heating cable the temperature does not increase at least at the predetermined rate of change, this observation is determined as flow taking place in the pipe and the supply of electricity to the heating cable is cut off.
摘要翻译：本发明涉及一种用于控制管道的跟踪加热的方法和装置。在管道中输送的材料用连接到管道上的加热电缆（2）加热，管道（1）的温度由连接在管道上的温度传感器（5）监测，根据该测量数据控制加热电缆的供电。温度传感器（5）所示的温度的变化率通过程序控制处理器（7）进行监控，并将变化率与预定的参考值进行比较。如果观察到比预定变化速度更快的温度下降，或者如果尽管用加热电缆进行加热，至少在预定的变化率下温度不会增加，这个观察被确定为在管道和加热电缆的供电被切断。

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