The invention relates to a method for culturing microalgae by utilizing
flue gas of a
coal fired power
plant, comprising the following steps of: firstly, introducing
flue gas to a CO removing
tower, and leading the trace amount of CO and NO to generate CO2 and N2 under the
catalysis of active semicoke; leading the
flue gas from the CO removing
tower to enter a desulfurizing
tower again, oxidizingSO2 in the
flue gas into SO3 under the
catalysis action of active semicoke by utilizing O2 contained in the
flue gas, and absorbing the SO3 on a catalyst; leading the
flue gas to enter a denitrifyingtower after passing through the desulfurizing tower, oxidizing the NO in the flue gas into NO2 under the
catalysis of active semicoke by utilizing the O2 contained in the flue gas, and absorbing the NO2 on the catalyst; and introducing the purified flue gas to a microalgae culturing device, fixing the CO2 in the flue gas by oily microalgae and then passing through a flue gas-flue gas
heat exchanger, and finally, exhausting the residual flue gas through a
chimney. In the method, the flue gas of a thermal power
plant is taken as one of raw materials for microalgae culture, high-quality oily microalgae is obtained as oil-producing materials, not only the environment is governed, but also fuel is produced, therefore, the method has very important social, economic and environmental benefits.