| 论文简介 |
Abstract
With the rapid economic and industrial development, the concentration of carbon dioxide in the atmosphere is increasing enormously, which has greatly affected the global climate and human living environment. At present, a lot of technologies have been applied to CO2removal in fossil fuel-fired power plants, which are one of the main CO2 emission sources. But few researches have been done in the cementindustry, which is the third largest CO2 emission source. There is no mature technology of CO2removal in cementindustry mentioned before. This paper proposes afeasibleprocess for simultaneousremoval of CO2, SO2 and NOx in the cementindustry by NH3scrubbing. As there is no ready steam source for the regeneration of CO2-rich loading solvent after absorption, aprocess with the final product of ammonium bicarbonate is developed. With the oxidative additive of NaClO2 added in the aqueous ammonium absorbent, the simultaneousremoval of CO2, SO2 and NOx is feasible by NH3scrubbing. The products of the process are mainly ammonium bicarbonate, ammonium sulfate and ammonium nitrate, which are all good fertilizers for crops and plants. The crystallization of NH4HCO3 is easier for storage and transportation than that for liquid carbon dioxide, which becomes more stable when dicyandiamide (DCD) is added. The thermodynamic analysis proves that the proposed process has the advantages of energy conservation and high thermodynamic perfection degree compared with the traditional ones.
Highlights
► Simultaneousremoval of CO2, SO2 and NOx is realized by NH3scrubbing with NaClO2. ► The crystallization process of NH4HCO3 is employed instead of CO2 regeneration. ► Energy consumption reduces hugely while CO2removal rate remains higher than 90%. ► Exergy calculation reveals that a higher thermodynamic perfection degree is achieved.
Keywords
Aqueous ammonium; Simultaneousremoval; Carbon dioxide; Sulfur dioxide; Nitrogen oxide; Cementindustry
下载地址：
http://www.sciencedirect.com/science/article/pii/S030626191100835X |
(创新港)
