Preparation of ethylene glycol/water-based CaCO3 nanofluids from coal gasification fine slag
DING Zihan
GAO Chunlei
HOU Junsheng
WU Junjie
HUANG Lei
ZHANG Hao
TIAN Baiqi
HAO Nanjing
Abstract：Gasification technology is one of the key technologies for the clean and efficient utili-zation of coal.Gasification fine slag,as a typical solid waste produced during the gasification process,its rational disposal is considered a significant challenge for the green development of coal chemical industry.Current high-value utilization strategies for gasification fine slag pre-dominantly focus on recovering residual carbon and silicon-aluminum components,while neg-lecting the untapped potential of calcium constituents.To achieve the resourceful and high-val-ue utilization of the calcium component in gasification slag,an innovative method for synthesi-zing ethylene glycol/water-based CaCO3 nanofluids using gasification fine slag as a calcium source has been developed.The influence of different precursor salt concentrations on the syn-thesis of nanofluids was investigated,successfully preparing ethylene glycol/water-based Ca-CO3 nanofluids with controllable particle size.Comprehensive characterization through X-ray diffraction(XRD),field-emission scanning electron microscopy(SEM),and Fourier-trans-form infrared spectroscopy(FTIR)elucidated the morphological features and crystalline struc-ture of synthesized CaCO3 nanoparticles.Moreover,based on a microchannel flow boiling test platform,the heat transfer performance of ethylene glycol/water-based CaCO3 nanofluids was evaluated.The synthesized nanofluid achieved up to 19.7％improvement in heat transfer coef-ficient(h)compared to base fluid,accompanied by a notable 17.6℃ reduction in silicon wafer surface temperature.This study not only establishes novel pathways for the valorization of gasification fine slag but also delivers critical guidance for the application of ethylene glycol/water-based CaCO3 nanofluids in phase change cooling of electronic devices.
Keywords：coal gasification fine slagnanofluidcritical heat fluxheat transfer coefficientphase change cooling
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 485-493 )