Oxy-Combustion Process for CO_2 Capture from Coal Fired Power Plants: An Overview of Techno-Economic Study and Engineering Feasibility Analysis

摘要

This paper describes various Oxy-Combustion (OC) technology developments that were performed and are being performed to capture carbon dioxide (CO_2) emissions from pulverized coal (PC) fired power plants. Tests were performed on 1.5 MW_(th) pilot boiler and the operation of the boiler under OC mode has been demonstrated along with a safe method of transition of the boiler from air combustion mode to OC mode. Economic assessment was performed on a 500 MWe sub-critical PC plant and is compared to post combustion amine scrubbing process (MEA). Upon successful pilot demonstration of the technology and favorable economics compared to post-combustion capture technology (MEA), engineering feasibility studies have been launched. Detailed process simulations and engineering assessments are being performed on 550 MWe net power plants incorporating supercritical (SC) and ultra-supercritical (USC) steam cycles. Air Separation Unit (ASU) design, boiler design and modifications, CO_2 compression and purification train development were carried out with fine details along with the cost estimations. Some task details are presented in this paper while detailed results will be included in the conference presentation. An engineering feasibility study to retrofit OC technology is almost finalized on a 25 MW_e existing PC unit. Functional analysis was performed with process heat and mass balances at various operating conditions, providing the conditions and information of new equipment required. No showstoppers were identified to retrofit the technology. Detailed cost estimation is in progress to assess the cost to perform a technology demonstration. As this task is also in progress, detailed results on this engineering study will be presented at the conference.