No abstract

No abstract

No abstract

In the last ten years, reducing CO2 emissions has been a very important focus across all industries. To efficiently achieve carbon reduction in the power generation sector, various policies, regulations, and legislation have been proposed. In addition, new energy sources and technologies have been developed and widely adopted. In this study, current and future CO2 emissions from the domestic power generation sector were calculated and predicted based on two national power generation plans. The overall power plant efficiencies, operation rate of power plants, power capacities, and CO2 emissions for 2030 were predicted based on the 7th and 8th basic plan for long-term electricity supply and demand in Korea. In addition, the CO2 emissions policies of several major countries announced in accordance with the Paris Climate Agreement were identified and compared with Korea's climate change policy. Finally, the improvement of power generation efficiencies and co-combustion of biomass with coal is recommended to help the reduction of the BAU-based CO2 emissions by 19.4%.

Three kinds of lignite were mixed with K 2 CO 3 and Ca(OH) 2 and were gasified with CO 2 to investigate the effect that the addition of Ca(OH) 2 had on the gasification kinetics. K 2 CO 3 and Ca(OH) 2 were impregnated and dried, their mixing ratio was varied, and the gasification experiments were conducted over a temperature range from 850 to 950°C at atmospheric pressure. The modified volumetric reaction model was applied as the gas-solid reaction model to analyze the carbon conversion results and thus obtain the kinetic parameters. The results indicate that the catalytic activity based on carbon conversion followed the order of K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% [ K 2 CO 3 8 wt% [ K 2 CO 3 3 wt% ? Ca(OH) 2 5 wt% [ K 2 CO 3 1 wt% ? Ca(OH) 2 7 wt%. The reaction rate was also influenced by the type of lignite, with a higher reactivity observed for Adaro lignite. The highest reaction rate constant was of 44.25 min -1 with Adaro lignite and K 2 CO 3 5 wt% ? Ca(OH) 2 3 wt% at 950°C. The lowest activation energy of 44.49 kJ/min was calculated for Mongolia lignite with K 2 CO 3 8 wt%. The reaction rate was enhanced by partly substituting K 2 CO 3 with Ca(OH) 2 , but further substitution resulted in a decrease in the reaction rate compared to that of K 2 CO 3 alone.