There are many start-up modes of high temperature induced draft fan motor. The starting point of selection is generally based on the economy of procurement cost or operation cost. Before that, first to understand the characteristics of various start-up aspects of high-temperature induced draft fan, and then select the appropriate one.
For high-temperature induced draft fan, the more economical and simple way to start is to use fixed frequency ordinary motor, but when the fan starts, it must close the air regulating valve. When the fan reaches the rated speed, gradually open the air regulating valve, with the rise of medium temperature, until it is fully opened.
It should be noted here that the design parameters of high temperature induced draft fan and the matching motor are all designed according to high temperature, but in the initial stage of fan operation, the gas in the pipeline is generally at room temperature, with high molecular density of gas and high mass per unit volume, so that the initial load of the fan will be relatively large, and the air regulator can not only regulate the air flow, but also prevent overcurrent.
Some high-temperature induced draft fans are equipped with fixed-frequency ordinary motors, which are started by frequency converter. This method is usually applicable to the condition that the flow rate does not need to be regulated frequently in the process of using the fan. When starting, start the motor at a lower frequency. With the increase of the air temperature of the fan, increase the frequency of the motor, which will not cause motor overload.
In addition, there are high-temperature induced draft fans equipped with variable frequency motor, using variable frequency start-up and operation. Although the procurement cost of this way is relatively high, but the later operation cost is very economic, more suitable for the fan often need to adjust the air flow conditions.