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Select Papers from the 2019 International Conference on Boilers and Heat Exchangers

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "J: Thermal Management".

Deadline for manuscript submissions: closed (20 March 2020) | Viewed by 10465

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Guest Editor
Sackville Street Building-D48, School of Electrical and Electronic Engineering, The University of Manchester, Manchester M13 9PL, UK

Special Issue Information

Dear Colleagues,

The 2019 International Conference on Boilers and Heat Exchangers (ICBHE2019) will be held in Hangzhou, China from November 1 to 4, 2019. ICBHE2019 aims to bring together researchers and practitioners from academia and industry around the world to discuss the latest progress and developments in the fields of boilers and heat exchangers. ICBHE2019 intends to be an international platform for knowledge sharing as well as creating a favorable atmosphere for the initiation of collaborations.

This event will include contributions by renowned plenary and invited speakers, oral presentations, poster sessions, and a technical exhibition that relates to the topics dealt with in the Scientific Program. The scope of the conference includes, but is not limited to, boilers, heat exchangers, energy and the environment, and measuring techniques.

Prof. Dr. Wuqiang Yang
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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Research

12 pages, 3477 KiB  
Article
Temperature Measurement Method of Flame Image Fusion with Different Exposures
by Liang Shan, Huiyun Huang, Bo Hong, Jun Zhao, Daodang Wang and Ming Kong
Energies 2020, 13(6), 1487; https://doi.org/10.3390/en13061487 - 21 Mar 2020
Cited by 10 | Viewed by 3027
Abstract
Fixed exposure will lead to underexposure or overexposure of collected flame radiation images using CCD, which has a great influence on the temperature measuring accuracy. A temperature measurement method was proposed by image fusion with multi-exposure, which can eliminate the influence of insufficient [...] Read more.
Fixed exposure will lead to underexposure or overexposure of collected flame radiation images using CCD, which has a great influence on the temperature measuring accuracy. A temperature measurement method was proposed by image fusion with multi-exposure, which can eliminate the influence of insufficient underexposure and overexposure. The approach was first to acquire a group of flame radiation images during different exposures. Then a partial region with good exposure effect in each radiation image was obtained by segmentation, with which the complete flame image can be spliced together. An experimental system was built to calibrate the temperature measurement parameters by two-color pyrometry through a blackbody furnace. The relation between exposure time and monochromatic gray level, as well as the relation between the temperature and temperature measurement coefficient were obtained. A candle flame was selected as the measuring object and the complete and accurate flame temperature distribution was acquired following our proposed method. The experimental results show that, compared with the temperature measurement using a single exposure time, our method can effectively avoid the measurement error caused by underexposure and overexposure, and improve the measurement accuracy. Full article
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20 pages, 3658 KiB  
Article
Optimization of Fluidization State of a Circulating Fluidized Bed Boiler for Economical Operation
by Xuemin Liu, Hairui Yang and Junfu Lyu
Energies 2020, 13(2), 376; https://doi.org/10.3390/en13020376 - 13 Jan 2020
Cited by 15 | Viewed by 2713
Abstract
To reduce the auxiliary power consumption and improve the reliability of large-scale circulating fluidized bed (CFB) boilers, we developed energy-saving CFB combustion technology based on the fluidization state re-specification. A calculation model of coal comminution energy consumption was used to analyze the change [...] Read more.
To reduce the auxiliary power consumption and improve the reliability of large-scale circulating fluidized bed (CFB) boilers, we developed energy-saving CFB combustion technology based on the fluidization state re-specification. A calculation model of coal comminution energy consumption was used to analyze the change in comminution energy consumption, and a 1D CFB combustion model was modified to predict the operation parameters under the fluidization state optimization conditions. With a CFB boiler of 480 t/h, the effect of fluidization state optimization on the economical operation was analyzed using the above two models. We found that combustion efficiency presents a nonmonotonic trend with the change in the bed pressure drop and feeding coal size. There are an optimal bed pressure drop and a corresponding feeding coal size distribution, under which the net coal consumption is the lowest. Low bed pressure drop operation achieved by reducing the coal particle size is not beneficial to SO2 and NOx emission control, and the pollutant control cost increases. The effect of fluidization state optimization on the gross cost of power supply can be calculated, and the optimal bed pressure drop can be obtained. Full article
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16 pages, 5201 KiB  
Article
Impacts of Organic Structures and Inherent Minerals of Coal on Soot Formation during Pyrolysis
by He-Ming Dong, Qian Du, Dun Li, Zhao-Yang Cui, Jian-Min Gao and Shao-Hua Wu
Energies 2019, 12(23), 4410; https://doi.org/10.3390/en12234410 - 20 Nov 2019
Cited by 12 | Viewed by 2448
Abstract
The pyrolysis of four pairs of raw and acid-washed coals under N2 atmosphere was carried out in a drop tube reactor at 1250 °C. The results show that both organic structures and metal elements have an important influence on the formation of [...] Read more.
The pyrolysis of four pairs of raw and acid-washed coals under N2 atmosphere was carried out in a drop tube reactor at 1250 °C. The results show that both organic structures and metal elements have an important influence on the formation of soot. The total area of aromatic and aliphatic hydrogen absorption bands is positively correlated with soot yield. Aromatic compounds have a greater contribution to soot and tar formation. The absorption band area of oxygen structures in coal FTIR spectra is negatively correlated with the soot conversion rate of tar. During pyrolysis, metal substances in coal can catalyze the dehydrogenation and deoxygenation of tar, reduce the content and stability of the aliphatic compound, and catalyze aromatic ring rupturing. More importantly, gasified metals can inhibit the polymerization reaction of aromatic compounds. Full article
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13 pages, 2470 KiB  
Article
Numerical Investigation of Heat Transfer to Supercritical Water in Vertical Tube under Semicircular Heating Condition
by Zhenchuan Wang, Guoli Qi and Meijun Li
Energies 2019, 12(20), 3958; https://doi.org/10.3390/en12203958 - 18 Oct 2019
Cited by 5 | Viewed by 1823
Abstract
In-depth understanding and analysis of turbulent convection heat transfer of supercritical water under semicircular heating conditions play a major role in system design and security. The inaccurate numerical results on simulating the buoyancy effect under deterioration heat transfer cases are partly attributed to [...] Read more.
In-depth understanding and analysis of turbulent convection heat transfer of supercritical water under semicircular heating conditions play a major role in system design and security. The inaccurate numerical results on simulating the buoyancy effect under deterioration heat transfer cases are partly attributed to the invalidity of the turbulent model. An improved turbulence model, which is validated suitable to three-dimensional model, is adopted in the present paper to numerical simulated flow and heat transfer in a vertical tube under semicircular heating condition. Heat transfer deterioration phenomenon occurs under semicircular heating condition, while the degree of deterioration is weakened due to the influence of variable physical properties and buoyancy effect. The velocity profile is distorted into “M-shape” in the heating side and present parabolic distribution in the adiabatic side, leading to different deterioration mechanisms under semicircular heating condition compared with uniform heating. The larger density difference between the heating side and the adiabatic side increases the shear stress production of turbulent kinetic energy; turbulent development is much faster recovery than the phenomenon in uniform heating condition. The results show that the semicircular heating condition can effectively alleviate the degree of heat transfer deterioration in a vertical tube. Full article
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