Development of a direct contact heat exchanger for energy and water recovery from humid flue gas

2020 ◽  
Vol 173 ◽  
pp. 115214 ◽  
Author(s):  
Zhaoyang Cui ◽  
Qian Du ◽  
Jianmin Gao ◽  
Rushan Bie ◽  
Dun Li
Keyword(s):  
Heat Exchanger ◽  
Flue Gas ◽  
Direct Contact ◽  
Water Recovery ◽  
Contact Heat ◽  
Direct Contact Heat Exchanger

scholarly journals Modelling of Technological Solutions to 4th Generation DH Systems

2017 ◽  
Vol 20 (1) ◽  
pp. 5-23 ◽  
Author(s):  
Edgars Vigants ◽  
Toms Prodanuks ◽  
Girts Vigants ◽  
Ivars Veidenbergs ◽  
Dagnija Blumberga
Keyword(s):  
Mass Transfer ◽  
Heat Exchanger ◽  
Flue Gas ◽  
Direct Contact ◽  
Positive Impact ◽  
District Heating ◽  
Heating Equipment ◽  
Contact Heat ◽  
Wet Gas ◽  
Direct Contact Heat Exchanger

Abstract Flue gas evaporation and condensing processes are investigated in a direct contact heat exchanger - condensing unit, which is installed after a furnace. By using equations describing processes of heat and mass transfer, as well as correlation coherences for determining wet gas parameters, a model is formed to create a no-filling, direct contact heat exchanger. Results of heating equipment modelling and experimental research on the gas condensing unit show, that the capacity of the heat exchanger increases, when return temperature of the district heating network decreases. In order to explain these alterations in capacity, the character of the changes in water vapour partial pressure, in the propelling force of mass transfer, in gas and water temperatures and in the determining parameters of heat transfer are used in this article. The positive impact on the direct contact heat exchanger by the decreased district heating (DH) network return temperature shows that introduction of the 4th generation DH system increases the energy efficiency of the heat exchanger. In order to make an assessment, the methodology suggested in the paper can be used in each particular situation.

New metrics for measuring multiphase mixing effects in a direct-contact heat exchanger

2019 ◽  
Vol 147 ◽  
pp. 592-601 ◽  
Author(s):  
Jianxin Xu ◽  
Qingtai Xiao ◽  
Zhihan Lv ◽  
Junwei Huang ◽  
Ruoxiu Xiao ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Direct Contact ◽  
Contact Heat ◽  
Mixing Effects ◽  
Direct Contact Heat Exchanger

scholarly journals Analytical Modelling of a Spray Column Three-Phase Direct Contact Heat Exchanger

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Hameed B. Mahood ◽  
Adel O. Sharif ◽  
Seyed Ali Hosseini ◽  
Rex B. Thorpe
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Direct Contact ◽  
Relative Velocity ◽  
Contact Heat ◽  
Spray Column ◽  
Three Phase ◽  
Direct Contact Heat Exchanger

An analytical model for the temperature distribution of a spray column, three-phase direct contact heat exchanger is developed. So far there were only numerical models available for this process; however to understand the dynamic behaviour of these systems, characteristic models are required. In this work, using cell model configuration and irrotational potential flow approximation characteristic models has been developed for the relative velocity and the drag coefficient of the evaporation swarm of drops in an immiscible liquid, using a convective heat transfer coefficient of those drops included the drop interaction effect, which derived by authors already. Moreover, one-dimensional energy equation was formulated involving the direct contact heat transfer coefficient, the holdup ratio, the drop radius, the relative velocity, and the physical phases properties. In addition, time-dependent drops sizes were taken into account as a function of vaporization ratio inside the drops, while a constant holdup ratio along the column was assumed. Furthermore, the model correlated well against experimental data.

Cold energy release characteristics of an ice/air direct contact heat exchanger

2001 ◽  
Vol 30 (2) ◽  
pp. 95-113
Author(s):  
Akiyoshi Ohira ◽  
Michio Yanadori ◽  
Kunihiko Iwabuchi ◽  
Toshikatsu Kimura ◽  
Yuji Tsubota
Keyword(s):  
Heat Exchanger ◽  
Energy Release ◽  
Direct Contact ◽  
Contact Heat ◽  
Cold Energy ◽  
Direct Contact Heat Exchanger
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