Experimental Study And Computer Simulation Of The Sour Compression Process For The Purification Of Oxv Fuel-derived CO₂

Causing of the dependence on fossil energy, a lot of greenhouse gas emissions have been discharged since the human going into the industrial era. Based on these things, there are many environmental issues coming up such as the greenhouse effect, global warming, the sea levels rising problem and so on. In recent years, facing with the CO2capture and storage technology in the field of thermal power generation, widely researches have been covered. The oxy-fuel technology is considered one of the best prospects for the development of CCS.The oxy-fuel technology is usually divided into three phases:air-separating, oxygen-enriched combustion, compression&purification. This paper is studying around the compression&purification process. The definition of C&P process is that purify the sour gas emissions such as SO2and NOx from the original gas during the compression process. The traditional disposal route is using the lye absorption liquid, such as FGD and SCR technology. Although the traditional method had a high removal efficiency, but there are lots of carbon dioxide which can largely expend the lye absorption liquid in the original gas. In view of this situation, this paper try to use non-alkaline liquid as the absorption liquid to avoid the overage expending which is usually called sour compression process.This paper constructs44species and a total of211detailed steps of kinetic reaction mechanism for the simulation which is correct by calculating. And use Chemkin the dynamics calculation software to simulate the flue gas of oxy-fuel combustion by gas-phase analog. The results of this simulation are as follow. NO can easily reacts with O2to NO2which can easily eliminating under the high reacting pressure, the conversion rate of NO is controlled by four factors:the reaction pressure, the reaction temperature, the reaction time and the initial concentration of NO. But the conversion of SO2to SO3is not obvious during the gas-phase simulation. Thereby, it is necessary to take the two-phase experiment.In order to know the removal mechanism and effects of the sour compression process better. This paper build two experimental rigs under atmospheric pressure and high-pressure to study the synthesis of oxy-fuel combustion flue gas which is absorbed by non-alkaline liquid. After lots of experiments, high NOX-SO2removal efficient had been found. When using300mL of deionized water as the absorption liquid, the overall removal efficiency of NOx and SO2is greater than95%under10bar and293K. This efficiency is related with the reaction pressure, reaction time and the liquid PH value. Ten leading elementary reactions had been listed.Through this study, it will help to understand the mechanism of the sour compression process, and it will contribute to the compression&purification process.