Simulation of an Integrated Gasification Combined Cycle with Chemical-Looping Combustion and CO2 sequestration

Chemical-looping combustion allows an integration of CO2 capture in a thermal power plant without energy penalty; secondly, a less exergy destruction in the combustion chemical transformation is achieved, leading to a greater overall thermal efficiency. This paper focus on the study of the energetic performance of this concept of combustion in an integrated gasification combined cycle power plant when synthesis gas is used as fuel for the gas turbines. After thermodynamic modelling and optimization of some cycle parameters, the power plant performance is evaluated under diverse working conditions and compared to a conventional integrated gasification combined cycle with precombustion capture. Energy savings in CO2 capture and storage has been quantified. The overall efficiency increase is found to be significant and even notable, reaching values of around 7%. In order to analyze the influence of syngas composition on the results, different H2-content fuels are considered

Techno-economic assessment of co-gasification of coal-petcoke and biomass in IGCC power plants

A process simulation model of the Integrated Gasification Combined Cycle (IGCC) plant of Elcogas was developed and validated with industrial data. The model was used to assess the technical and economic feasibility of the process co-fired with up to 20% by weight of two local biomass samples (olive husk and grape seed meal). Results indicate promising features of the process in the forthcoming scenario of more severe limitations to CO2 emissions

A Multivariable Approach for Control System Optimization of IGCC with CCS in DECAR Bit Project

Abstract IGCCs with CCS differ from existing IGCCs mainly because of steam integration between gasification process and combined cycle, and because of selective capture of CO2. A dynamic simulator of IGCCs with CCS considered in DECARBit project was developed by using a in house code, ALTERLEGO, and a commercial code ASPEN HYSYS ® . Simulators were used to assess flexibility of the process design and effectiveness of the control system during load changes. Starting from steady state results at nominal load, the simulator development has been implemented to assure a stable transient behavior during load reduction. As a result of this study, the flue-gas temperature and IP pressure should be regulated at fixed setpoint. Moreover, critical behavior of CO shift temperature controllers,can be mitigated by means of suitable setpoint coordination

Sustainable Clean Coal Technology with Power and Methanol Production

The coal-based chemical process is still indispensable in modern society due to the worldwide vast reserves and popular price of coal. Power generation and chemical production from coal still play an important role in the global chemical industrial market. Electricity generation and chemical production from coal is still the trend as long as the coal is plentiful and inexpensive. Modern chemical industry aims at sustainability and hence the development of clean coal technologies is critical. Coal-based methanol economy, as an attractive liquid transportation fuel as well as an essential intermediate chemical feedstock, can fill a possible gap between declining fossil fuel supplies and movement toward the hydrogen economy. The integrated gasification combined cycle (IGCC) power plant with methanol production is simulated by Aspen Plus. Within the plant, firstly, the coal is fed to a pyrolysis reactor, and the volatile matter is fed into an oxy-combustion reactor, while the char is gasified in an entrained flow gasifier. The heat is used to produce electricity, while the syngas is converted to methanol. The integral plant consisting of an air separation unit, oxy-combustion of coal, gasification of char, electric power production, carbon capture and conversion to methanol has been designed and optimized by using the Aspen Plus package. The optimization includes the design specification, process heat integration using energy analyzer toward a more efficient clean-coal technology with methanol production. Multiple methods including life cycle assessment, sustainability metrics, and multi-criteria decision matrices are applied to analyze the sustainability of a certain clean-coal based IGCC power plant with methanol production. The focus of this study is the kinetic study of a clean coal energy technology with power and methanol production. As an alternative method, chemical looping technology is discussed briefly. Chemical looping technology is a new method utilizing inherent CO2 capture to address the concerns of growing levels of atmospheric CO2. The studied IGCC plant is compared with a conventional IGCC power plant to better understand the feasibility of the technology. A multi-criteria decision matrix consisting of economic indicators as well as the sustainability metrics shows that methanol and steam productions besides the power production may improve the overall feasibility of clean coal technology. The goal of this work aims at developing the use of abundant resources of coal energy in the following aspects: energy security, reduction of Greenhouse Gas emission, co-production and kinetics study in coal-based chemical processes and sustainability analysis. Advisor: Yaşar Demire

Exergy analysis of the methane and electricity production processes from coal gasification

Mediante un proceso de poligeneración se puede transformar el carbón mineral en distintos productos tales como; electricidad, calor, sustancias químicas de uso industrial y combustibles líquidos o gaseosos entre otros. La poligeneración tiene como base la gasificación de carbón y ha sido desarrollada en los países industrializados para grandes escalas de producción, aprovechando principalmente carbones de bajo rango calórico. En esta investigación se realiza un análisis exergo-económico de un proceso combinado de producción de potencia eléctrica, calor y gas natural a partir de carbón mineral, de igual forma se evalúa la sostenibilidad del proceso desde el punto de vista de emisión de gases efecto invernadero.   Distintas tecnologías de gasificación de carbón a gran escala se consideraron en el análisis: lecho fijo, lecho fluido y lecho entrante. Finalmente se evalúo la producción de grandes volúmenes de metano a partir de carbón mineral.  MaestríaMagister en Ingeniería Mecánic