Advanced petroleum coke oxy‐combustion power generation with carbon capture and sequestration: Part I—Design and techno‐economic analysis

Abstract

This study presents a first-of-its-kind design and economic analysis of a petroleum coke oxy-combustion electric power generation technology operated with and without carbon capture and sequestration. In this work, we examined three petroleum coke oxy-combustion designs: petcoke oxy-combustion, petcoke oxy-combustion operated with carbon capture and sequestration (CCS), and petcoke oxy-combustion with CO 2 purification by distillation and CCS. The technical and economic performance of the designs were assessed based on thermal efficiency, CO 2 capture rate, pipeline CO 2 purity, CO 2 emissions, and levelized cost of electricity (LCOE). The results of our assessments yielded a base-case LCOE of $84.24/MWh for the petcoke oxy-combustion design, $90.94/MWh for the petcoke oxy-combustion design operated with CCS, and $102.8/MWh for petcoke oxy-combustion with CO 2 purification by distillation and CCS. Although the design that employed CO 2 purification had higher LCOE than the other designs, its captured CO 2 stream meets pipeline standards. Therefore, this design was selected for the proposed petroleum coke oxy-combustion technology. Further analysis carried out includes the cradleto-customer gate life-cycle environmental impact assessment of the petcoke oxy-combustion power plant which is presented in Part II of this work. Thus, this work represents the first study to present the eco-technoeconomic and life-cycle analysis that considered the impacts of O 2 removal from CO 2 captured from oxy-combustion exhaust via cryogenic distillation for solid fuels in general. K E Y W O R D SCO 2 capture, eco-techno-economic analysis, electricity, oxy-combustion, petcoke Abbreviations: CCA, cost of CO 2 avoided; CCS, carbon capture and sequestration; DCFROR, discounted cash flow rate of return; FGD, flue gas desulfurization; GHG, greenhouse gas; HEN, heat exchanger network; HHV, higher heating value; HPT, high-pressure turbine; HRSG, heat recovery steam generator; IGCC, integrated gasification combined cycle; IPT, intermediate pressure turbine; LCOE, levelized cost of electricity; LPT, lowpressure turbine; OPEX, operating expenditure; POXY CCS, petcoke oxy-combustion with CCS; POXY, petcoke oxy-combustion; POXYD, petcoke oxy-combustion with CO 2 purification by distillation and CCS; ROR, rate of return; TCI, total capital investment.

Advanced petroleum coke oxy‐combustion power generation with carbon capture and sequestration: Part II—Environmental assessment and cost of CO2 avoided

“…The material consumption, energy demand, electricity production, and emissions generated from each petcoke oxy-combustion process was taken from Part I of this work. [4] Additional data used for this LCA study can be found in the Supplementary Information (Appendix S1), which includes details of the material input and output.…”

“…[1] However, instead of stockpiling, petcoke can be disposed of without violating governmental combustion restrictions by consuming it as a fuel in an oxy-combustion process for electricity generation. Part I of this work [4] introduced three petcoke oxy-combustion variants and computed the technical and economic feasibility of each using process simulations. This work focuses on the potential environmental impacts and benefits of this approach.…”

“…The reader is referred to Part I of the work for a detailed description of these processes, mass and energy balances, stream conditions, and economic analyses. [4] The scopes covered in this work include cradle-toplant-exit-gate (CTPG) and cradle-to-customer-gate (CTCG) material and energy inputs and outputs, with their corresponding emissions over the life cycle of the petcoke oxy-combustion plants, and with analysis boundaries illustrated in Figure 1. This includes the operation of the power plant, its commissioning and decommissioning, and the disposal of solid ash wastes from it.…”

Issue Highlights

“…Overall, different performance metrics are presented and discussed. [4] Advanced petroleum coke oxy-combustion power generation with carbon capture and sequestration: Part II-Environmental assessment and cost of CO 2 avoided Ikenna J. Okeke, Thomas A. Adams II Based on the design and systems performance presented in Part I of our work, this study explores the cradle-to-customer-gate (considering the direct and indirect emissions) environmental life cycle assessment for a petroleum coke oxy-combustion power plant operated with and without carbon capture and sequestration. In addition, for the designs operated with carbon capture and sequestration, the cost of CO2 avoided was estimated to ascertain the cost penalty associated with reducing carbon emissions.…”

“…Midpoint and endpoint environmental impact categories are presented in this work to ease interpretation at each stage and end-of-life of the petroleum coke to electricity processes. [5] Isothermal redox cycling of A-and B-site substituted manganite-based perovskites for CO 2 conversion Pradeep Shrestha, Mahesh M. Nair, Nader Mahinpey…”