flue gases

In recent years, people have paid more and more attention to environmental protection, and environmental protection standards have become increasingly stringent. The application of denitrification technology in coal-fired boilers is an effective way to reduce nitrogen oxides, and it has also received great attention. There are two main types of denitrification technology: SNCR (selective non-catalytic reduction technology) and SCR (selective catalytic reduction technology).

A new method of flue gas desulfurization with the production of a valuable is proposed. The essence of the method is to pass flue gases through a scrubber (Venturi) filled with magnesium hydroxide suspension. At the same time, SO2 of the flue gases will react with magnesium hydroxide according with the formation of magnesium sulfite. Crystals of magnesium sulfite are able to interact with new portions of SO2 and turn into hydrosulfite. As a result of such "washing" of flue gases, a suspension of sparingly soluble salt MgSO3∙6H2O in a 12-15% solution of MgSO4 is obtained.

The article deals with the investigation of the influence of sulfur compounds concentration on the cultivation of microalgae Chlorella vulgaris for the purpose of future use of flue gases as a nutrient source. The alteration of culture medium pH and microalgae biomass production under simultaneous injection of CO2 and H2SO4 or Na2SO3 are studied. It is shown that the enhancement of sulphur concentration to 0.44 g/L by using Na2SO3 increases the biomass growth by 15 percent and does not cause deviations from the optimal pH range.