Conceptual Design and Experimental Study Overview: Flue Gas Treatment and CO{sub}2 Recovery System for High Pressure Oxygen Fired Coal Combustion

摘要

A study was conducted to develop and evaluate a conceptual flue gas treatment and CO{sub}2 recovery system (FGTCR) for high pressure coal fired oxy-fuel combustion (HiPrO{sub}x) process. Experimental investigation of such a system has also been proposed. The FGTCR design criteria were based on HiPrO{sub}x flue gas conditions and CO{sub}2 product specifications suitable for Enhanced Oil Recovery (EOR) or geological storage. The unique feature of the FGTCR system for HiPrO{sub}x is the elevated flue gas pressure. As a result, the FGTCR system consists of various impurity gas clean-up processes without including extensive flue gas compression and refrigeration processes. This is in contrast to a product recovery train (PRT) typically used for ambient pressure oxy-fuel combustion processes. In general, it is expected that the FGTCR system will require much less energy compared to a system employing a PRT because of the elimination of the compression and refrigeration processes. The potential impurity removal technology options for the FGTCR system include cyclonic and barrier filtration for particulate matter removal, condensation and adsorption drying for moisture removal, flue gas desulphurization (FGD) and direct sorbent injection for SO{sub}x removal, and cryogenic separation and catalytic reduction for non-condensable impurity removal. Although operating conditions of the FGTCR system are significantly different from those in existing commercial applications, it is expected that there are no significant technical barriers in implementing these technologies in an FGTCR system. An experimental study is being conducted at the CANMET Energy Technology Centre - Ottawa (CETC-Ottawa) to confirm the feasibility of the high pressure flue gas treatment and CO{sub}2 recovery system. The FGTCR system was designed to purify 50kg/h of synthetic flue gas. A mixed gas delivery system will supply synthesis flue gas at various compositions, pressures and temperatures.