456332 Design and Economic Analysis of IGCC Power Plants with CO2 Capture

Tuesday, November 15, 2016: 1:00 PM
Powell (Hilton San Francisco Union Square)
Umer Zahid, Chemical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia, Usama Ahmed, Seoul National University, Seoul, Korea, The Republic of and Chonghun Han, School of Chemical & Biological Engineering, Seoul National University, Seoul, Korea, The Republic of

Power producing industry has largely relied on coal as a fuel source and will continue to depend on it for coming decades under the current situation. However, in order to curtail CO2 emissions while keeping high efficiency and economic feasibility of the processes is a key challenge. Post combustion coal-fired power plants usually have lower capital costs and cost of electricity without CO2 capture. On the other hand, pre-combustion plants tend to be less expensive if the current CO2capture systems are to be added. This analysis suggests that pre-combustion technology for the power generation can be an attractive option if carbon capture and storage (CCS) technology is implemented on a large scale. In this study IGCC process has been simulated in order to analyze the overall plant output with CO2 capture using a physical solvent. Three design schemes have been developed to analyze the overall plant performance and economics. In order to ensure a fair evaluation of analysis, a consistent and transparent methodology has been followed for all the cases. First two cases use the water gas shift reactions scheme with sour shift catalysis process. The resulted syngas free of CO2 can either be combusted by using air or O2. The first case uses air as an oxidant for burning H2 and the combustor temperature is controlled by air as well. In the second case, O2 is used as an oxidizing agent in the H2 combustion. However, combustion temperature control is achieved by recycling the captured CO2. In the third model, WGS reactor has been removed. The syngas composed of CO and H2 is sent directly for combustion which makes it similar to the oxy-fuel combustion process. In this way, captured CO2 can be recycled back to control the combustor temperature in 2nd and 3rdcase. The results showed that the net power generation capacity and efficiencies calculated for case 1, case 2 and case 3 are 375 MWe, 354 MWe, 388 MWe and 35.87%, 33.89%, 37.15% respectively. Finally, an economic analysis has been performed which shows that the total investment cost (TIC) and operation and maintenance (O&M) required per unit (MW) of electricity generated for case 1, case 2 and case 3 is (2.97, 3.40, 2.64) and (0.2486, 0.2706, 0.2242) M€’s respectively. With the highest net power generation capacity and least TIC and O&M cost requirements, case 3 has been evaluated as the most feasible design. If the sole purpose of IGCC power plant is power generation with CO2 capture, case 3 design offers a cost reduction of 8.17% and 6.59% in the total investment and O&M cost requirements respectively as compared to the base case design.

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