Process design and thermoeconomic evaluation of a CO2 liquefaction process driven by waste exhaust heat recovery for an industrial CO2 capture and utilization plant
13 May 2021-Journal of Thermal Analysis and Calorimetry (Springer International Publishing)-Vol. 145, Iss: 3, pp 1585-1597
TL;DR: In this article, the potential of using excess heat in the main industrial CO2 capture and utilization plant of Iran is investigated, and a CO2 liquefaction cycle is developed using the heat waste of the flue gas.
Abstract: Industrial surplus heat is a great available source and because of potential for external use can create benefits for society and industry. Utilizing surplus heat can deliver a way to decrease the use of primary energy and to play a part in global CO2 mitigation. The potential of using excess heat in the main industrial CO2 capture and utilization plant of Iran is investigated. A CO2 liquefaction cycle i.e., ammonia-water absorption system is developed using the heat waste of the flue gas. Process modeling is developed in Aspen Hysys™ v.10 software with the aid of Peng-Robinson equation of state. Energy, exergy, economic and exergoeconomic analyses are then employed to evaluate the developed CO2 liquefaction cycle integrated into the carbon capture and utilization plant. Results of process design and simulation show that the developed CO2 liquefaction system can liquify CO2 with the capacity of 54.5 tons per day using the flue gas enthalpy. The developed CO2 liquefaction system has the COP of 0.28, and overall exergy efficiency of 69.7%. The highest amount of exergy is destructed in ammonia reboiler with the amount of 281.92 kW. Exergoeconomic results reveal that the compressors in CO2 compression unit along with ammonia absorber and stripper have the highest importance among equipment.
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TL;DR: In this paper , the location, magnitude, and source of thermodynamic inefficiencies of the urea production in the largest CO 2 utilization plant in Iran were evaluated using exergy, exergoeconomic and exergonenvironmental analyses.
Abstract: CO 2 utilization is one of several tools available to us to mitigate climate change. This paper aims to study and optimize the urea production in the largest CO 2 utilization plant in Iran. The location, magnitude, and source of thermodynamic inefficiencies of the plant are evaluated using exergy, exergoeconomic and exergoenvironmental analyses. The optimization process uses as decision variables the temperature of the lean monoethanolamine solution and loading, along with the height of the absorber and the stripper of the plant. The decision variables and objective functions are trained with a hybrid combination of an artificial neural network with a genetic algorithm. The multi-objective genetic algorithm results in a pareto front of solutions. The exergy efficiency of the overall system is found to be 30.89% and 3.57, 2.86, 2.21% of the exergy of the fuel provided to the plant is destroyed in the soda ash wash direct contact, the stripper, and the absorber columns (424.07, 339.71 and 258.61 kW), respectively. The exergoeconomic analysis shows that the heat exchangers E-7 and E-8 result in relatively low exergoeconomic factor; therefore, an enhancement in the thermodynamic performance of the heat exchangers should be considered. The absorber column is found to have the largest environmental impact, equal to approximately 0.1205 mPt/s. The highest environmental impact of exergy destruction, equal to 33,256.3 mPts/hr is found in the stripper. • An industrial CO 2 capture and utilization integrated to a urea plant is investigated. • The system is optimized with an artificial neural network coupled to a genetic algorithm. • The plant is evaluated with exergy, exergoeconomic and exergoenvironmental analyses.
18 citations
01 Dec 2021
TL;DR: In this article, the authors used VOSviewer software for Bibliometric analysis of carbon dioxide capture technologies and identified gaps that could help researchers gain insight and determine future research trends.
Abstract: Nowadays, we are experiencing daily growth in the consumption of non-renewable energy resources such as oil and gas. Utilizing these energy sources leads to the production of large amounts of carbon dioxide. The emission of this greenhouse gas into the atmosphere accelerates the global warming and its irreparable consequences. Therefore, it is vital to overcome this phenomenon through elimination of the generated carbon dioxide. This could be achieved by focusing on the existing research experiences in this field and considering proposed methods for eliminating this emission. In addition, the removed carbon dioxide gas could be used in the over-harvesting process of hydrocarbon reservoirs. This study will use VOSviewer software for Bibliometric analysis of carbon dioxide capture technologies and identify gaps that could help researchers gain insight and determine future research trends. We will also review the registered patents for carbon capture technologies and identify the inventors and companies involved in patents. The results suggest that the supply of energy from renewable energy sources and the application of energy policy, decision-making methods, and commercialization methods can significantly contribute to the development and evolution of carbon capture technologies. Also, the high number of patents filed by companies reveals that carbon capture technologies are on the way to commercialization.
16 citations
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TL;DR: In this article, the authors proposed that industrial excess heat is a large untapped resource, for which there is potential for external use, which would create benefits for industry and society.
120 citations
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112 citations
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