Flue Gas Water Recovery by Indirect Cooling Technology for Large-Scale Applications: A Review
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https://doi.org/10.1007/s11630-020-1360-9
Article ID: 1003-2169(2020)00-0000-00
Flue Gas Water Recovery by Indirect Cooling Technology for Large-Scale Applications: A Review ZHONG Wei, JI Wenhui, CAO Xiaoling, YUAN Yanping* School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: With social development and economic enhancement, energy is facing significant worldwide demand, and fossil fuels are the prime energy sources for various energy systems over past decades. Furthermore, among fuel-consumed applications, power plants are the primary source of energy consumption. There is a lot of waste heat and steam accompanied by the latent heat produced in the exhaust flue gas. Therefore, the latent heat recovery from the flue gas plays an important role in increasing the efficiency of the system and saving water. To recover the heat and mass in power plants, three primary methods are proposed to condense the vapor based on previous studies: (1) flue gas condensation technology, (2) liquid desiccant-based dehydration (LDD) technology and (3) membrane technology. This paper mainly reviews and summaries the indirect cooling technology in flue gas condensation technology. The numerical simulation and theory of flue gas condensation are introduced. Different heat exchanger types and conducted experiments are also summarized. The performance of the indirect cooling technology is affected not only by its own configuration and design but also by the flue gas inlet temperature, velocity, water vapor mass fraction, etc. The major concerns and outlook of practical applications for further study are attributed to the heat exchanger size and cost, acid corrosion, ash accumulation in flue gas, etc.
Keywords: flue gas, condensation, water recovery, heat exchanger, power plants
1. Introduction With social development and economic enhancement, energy is facing significant worldwide demand in daily life and industries [1, 2]. Fossil fuels, e.g., oil [3], coal [4], and natural gas [5, 6], are the prime energy sources for various energy systems over the past decades. The fuels are used for motor vehicles [7], power plants [8], steel production [9], chemical processing [10], etc. As a result of the increasing consumption of fossil fuels for the past decades, a massive magnitude of waste heat was released to the atmosphere without being recycled [11].
Among these fuel-consumed applications, power plants are the primary source of energy consumption. The waste latent heat of the flue gas from various types of power plants has increased to 5%–10% because of the direct exhaustion of water vapor without recovery or utilization [12, 13]. Recently, clean fuel, like natural gas, is widely used for power plants because of the biological and environmental considerations. As natural gas consists of a large number of hydrogen rather than carbon, there is a lot of steam accompanied by the l
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