(Speaker27193)Phase Transitional Absorption for CO2 Removal in Coal Gasification

摘要

Carbon dioxide removal technology is being used in coal gasification in order to meet the process needs.Carbon capture is also increasingly being utilized in coal gasification processes to address the greenhouse gas emissions concern associated with the use of coal and carbonaceous fuels. In this respect, gasification has a significant advantage over conventional coal combustion, in which CO2 resulting from combustion is considerably diluted by nitrogen and residual oxygen in the near-ambient pressure combustion exhaust, making it relatively difficult, energy-intensive, and expensive to capture the CO2 (this is known as “post-combustion” CO2 capture).In gasification, on the other hand, oxygen is normally supplied to the gasifiers and just enough fuel is combusted to provide the heat to gasify the rest;;moreover, gasification is often performed at elevated pressure. The resulting syngas is typically at higher pressure and not diluted by nitrogen, allowing for much easier, efficient, and less costly removal of CO2. Gasification and integrated gasification combined cycle’s unique ability to easily remove CO2 from the syngas prior to its combustion in a gas turbine (called "pre-combustion" CO2 capture) or its use in fuels or chemicals synthesis is one of its significant advantages over conventional coal utilization systems.