Heat Transfer Characteristics and Pressure Drop in a Horizontal Circulating Fluidized Bed Evaporator
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RESEARCH ARTICLE
Heat Transfer Characteristics and Pressure Drop in a Horizontal Circulating Fluidized Bed Evaporator Xu Liang1 · Feng Jiang1 · Guopeng Qi2 · Jinjin Wang1 · Xinhua Dong1 · Wenyue Jing1 · Ruijia Li1 · Xiulun Li1 Received: 1 September 2020 / Revised: 28 September 2020 / Accepted: 15 October 2020 © Tianjin University and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract A vapor–liquid–solid horizontal circulating fluidized bed evaporation setup was constructed to study the thermal-exchange properties and pressure change. The influences of the operating variables, including the amount of added particles, heat flux, and circulating flow velocity, were systematically inspected using resistance temperature detectors and pressure sensors. The results showed that the heat transfer effect was improved with the increase in the amount of added particles, circulating flow velocity, and particle diameter, but decreased with increasing heat flux. The pressure drop fluctuated with the increase in operating parameters, except circulating flow velocity. The enhancing factor reached up to 71.5%. The enhancing factor initially increased and then decreased with the increase in the amount of added particles and circulating flow velocity, fluctuated with increasing particle diameter, and decreased with increasing heat flux. Phase diagrams showing the variation ranges of the operation variables for the enhancing factor were constructed. Keywords Heat transfer characteristics · Pressure drop · Horizontal circulating fluidized bed evaporator · Vertical heights · Fouling prevention and removal
Introduction Many industrial heat-exchange processes are limited due to scaling, which significantly weakens the heat-transfer performance of equipment, increasing costs and energy consumption [1–5]. Some measures have been reported to solve this problem, such as the use of ultrasonic waves, the application of electromagnetic field, the rubber ball method, the mounting of rotating parts in heat-transfer device, and the introduction of a scale inhibitor. However, most of these solutions increase the operating costs and are inhibited by environmental factors or product regulations. The circulating fluidized bed heat-transfer (CFBHT) technology, which requires less investment and maintenance costs [6], is a promising solution; it can not only enhance heat transfer but also prevent and remove scaling, due to its on-line selfcleaning mechanism. * Feng Jiang [email protected] 1
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin 300410, China
2
The CFBHT technology has been used in various industrial production processes, including catalytic cracking [7], papermaking [8], desalination [9, 10], wastewater evaporation [11], crystallization [12], pharmaceutical [13] and environmental industries. In CFBHT technology, the particles can effectively remove heat by contacting the heat exchan
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