Title: The reason for the difference in the current of the thermal power induced draft fan in the cold and hot state.
Induced draft fans play a vital role in thermal power plants, chemical enterprises and other fields, and their main function is to extract and transport gaseous media, such as air and flue gas. However, during operation, it is often found that the click current of the induced draft fan is larger in the cold state than in the hot state. What is the reason behind this phenomenon? This article will explain it in detail for you.
First of all, we need to understand how the induced draft fan works. The induced draft fan rotates the blades to create a flow of air, which realizes the delivery of gas. The inlet baffle is an important part of regulating the air volume, and its opening directly affects the air volume through the fan. With the same opening of the inlet baffle, we can assume that the air volume through the fan is approximately the same.
However, the power required by the induced draft fan is directly proportional to the density of the medium. In the hot state, the flue gas temperature is high and the density is small, so the power required by the induced draft fan is also relatively small. Whereas, in the cold state, the air temperature is low, the density is high, and the power required is high. This is why the click current of the induced draft fan is greater in the cold state than in the hot state.
Further analysis, we can find that in the cold operation, the inlet baffle is not fully opened, and the motor current has exceeded the rated current. This is because, in the cold state, the air is dense and requires more power to produce the same airflow. In the hot state, the flue gas density is small, the power required is small, and the current is relatively small.
It should be noted that although the current of the induced draft fan is high in the cold state, this does not mean that it works efficiently. In fact, the current only reflects the power required by the induced draft fan, and cannot directly explain its working efficiency. In practical application, we need to adjust the opening of the inlet baffle according to the specific situation to ensure the normal operation of the induced draft fan and improve its work efficiency.
In short, the click current of the induced draft fan in the cold state is larger than that in the hot state, which is mainly due to the difference in the density of the medium. This phenomenon suggests that in practical application, we should fully consider the influence of temperature on the performance of the induced draft fan, and reasonably adjust the opening of the inlet baffle to ensure the normal operation of the induced draft fan.