In the management of coal yard, the phenomenon of self-heating and spontaneous combustion is widespread. The self-heating and spontaneous combustion of coal pile not only waste energy and increase the cost of power generation, but also cause serious pollution to the environment by carbon monoxide, sulfur dioxide and other harmful gases produced by spontaneous combustion. With the further promotion of power plant of blending system and the popularization, the power plant used by more and more coal, producing area and source, fuel management work more and more complex, faces many challenges, including of heating combustion phenomenon more and more serious, the traditional artificial coal temperature and burn the old "new" system is more and more not adapt to the current status of coal yard, unable to curb of heating combustion phenomenon.

At present, the traditional of coal temperature measuring device is to open a at both ends of the tube inserted into the depths of one, and then put a rope connected thermometer in the pipe, temperature measurement, so the temperature measurement on the downside, the tube is inserted into the process of oxidation layer, due to the tube inserted into the pile end is open, the coal surface of coal is not because tube insertion were pushed out, However, it remains in the inside of the tube. Although the coal on the surface of the coal pile will sink to a certain extent with the tube in the process of inserting the tube into the coal pile, it is still the surface coal, that is, the traditional measurement method measures the temperature of the coal on the surface of the coal pile, so that the temperature measuring component can not accurately measure the actual temperature of the oxide layer. In addition, as there is no mark indicating the height of the pipe, how deep the temperature measuring pipe needs to be inserted depends on the operator's experience, which also leads to the inability to accurately measure the actual temperature of the oxide layer. It can be seen that the traditional coal pile temperature measuring device can not accurately measure the actual temperature of oxide layer because of its structural defects, so that it can not play a role in monitoring the coal pile, and even bring serious consequences.