Method for culturing microalgae by utilizing flue gas of coal fired power plant

Abstract

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.

Description

technical field [0001] The invention relates to a method for cultivating microalgae, in particular to a technique for cultivating microalgae by using flue gas from a coal-fired power plant, which belongs to the field of new energy. Background technique [0002] my country is a big country in coal production and consumption. my country's air pollution is a typical coal-type pollution, and the pollution is serious. The main pollutant is SO produced by coal burning. 2 and NO X . [0003] According to the China Environmental Statistical Annual Report and the National Environmental Announcement, in 2008, sulfur dioxide (SO 2 ) emissions of 23.212 million tons, nitrogen oxides (NO X ) emissions of 16.294 million tons. National sulfur dioxide (SO 2 ) emissions of 22.144 million tons. Relevant expert studies have shown that for every ton of SO emitted in China 2 The resulting economic loss is about 20,000 yuan. The "Eleventh Five-Year Plan" for my country's national economic...

AI Technical Summary

Problems solved by technology

But there are also the following disadvantages: 1. It is easy to cause leakage of ammonia (or urea), causing secondary pollution; 2. Ammonia (or urea) is very corrosive, and the equipment cost is high; 3. Due to the high temperature, the SCR reactor needs to Installed before electrostatic precipitator, resulting in severe "etching" of dust on the structured catalyst; 4. The structured catalyst is expensive

However, the use of by-product ammonium sulfate and ammonium nitrate in the flue gas purification process as nutrient salts for the growth of microalgae and the use of waste heat from power plants to develop constant temperature oily microalgae culture and carbon fixation technology have not yet been reported.