The inlet flue gas temperature of the waste heat boiler depends on the temperature of the equipment you want to recycle, because the waste heat boiler is usually directly connected to the equipment you want to recycle by flue. For example, if you want to recover the high-temperature flue gas of the generator set now, the flue of the waste heat boiler will be directly connected to the high-temperature flue gas outlet of the generator set and then recovered in the waste heat boiler. Therefore, the low flue gas temperature at the inlet of the waste heat boiler means that the flue gas temperature at the outlet of the equipment you recycle is low.