DEVICE AND METHOD FOR DETECTING THE SPECIFIC HEAT FLOW TO A MEMBRANE WALL FOR OPTIMIZING THE BOILER DESIGN AND BOILER OPERATION

摘要

The heat flow sensor consists of at least two contact points (7, 8) arranged respectively on a pipe (3) and spacing bar (4) of the membrane wall (2) made of ferrous material such as low alloyed steel. A respective Constantan wire (10a, 10b) is connected at each point so that the metal of the membrane wall itself forms part of two thermocouples with the wires. The contact points are spaced at a distance appropriate for the measurement of the temperature difference. The thermal conductivity of the individual components, i.e. the pipe, bar and refractory lining (11), the heat transfer from the pipe into the boiling water (13), and the specific heat flux on the membrane wall are all taken into account in presenting the measured differential voltages as heat flow units on the display device (9). An independent claim is included for a method for designing and testing of the heat transfer performance in wall regions of thermal power plants.