煤气化细渣制备乙二醇/水基 CaCO3 纳米流体

Gasification technology is one of the key technologies for the clean and efficient utilization 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 predominantly focus on recovering residual carbon and silicon-aluminum components, while neglecting 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 synthesizing 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 synthesis of nanofluids was investigated, successfully preparing ethylene glycol/water-based CaCO3 nanofluids with controllable particle size. Comprehensive characterization through X-ray diffraction (XRD), field-emission scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy (FTIR) elucidated the morphological features and crystalline structure 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 coefficient (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.