A kinetic model of the pozzolanic reaction for the preparation of flue gas desulfurizers from fly ash and Ca(OH)_(2) was deduced on the basis of solid phase reaction kinetic theory.Kinetic expressions and parameters w...A kinetic model of the pozzolanic reaction for the preparation of flue gas desulfurizers from fly ash and Ca(OH)_(2) was deduced on the basis of solid phase reaction kinetic theory.Kinetic expressions and parameters were obtained and verified by experiment.A comparison of calculated results with experimental results showed that precision in kinetic expressions was good.The apparent reaction rate constants of the pozzolanic reaction could be raised by increasing the specific surface area of fly ash and the hydration temperature,and by using a suitable additive.展开更多
The aim of this current work is to investigate the effects of operating parameters on heat transfer characteristics between gas and in-cylinder solid surfaces in a reciprocating compressor.A numerical model has been i...The aim of this current work is to investigate the effects of operating parameters on heat transfer characteristics between gas and in-cylinder solid surfaces in a reciprocating compressor.A numerical model has been implemented in MATLAB based on mass balance,the first law of thermodynamics,and NIST REFPROP database for gas properties and thermodynamic relationships.The impacts of key parameters such as rotational speed,suction temperature,pressure ratio and suction pressure are particularly evaluated on heat transfer coefficient(HTC),heat flux(HF)and gas temperature.Results demonstrate that HTC increases markedly with the increase of rotational speed,pressure ratio and suction pressure,and decreases slightly with the increase of suction temperature;the instantaneous HF strengthens significantly with the increase of rotational speed,pressure ratio and suction pressure,whereas the mean HF magnitude transferred from gas to the wall decreases with the increase of rotational speed;the maximum gas temperature is more sensitive to suction temperature and pressure ratio.展开更多
文摘A kinetic model of the pozzolanic reaction for the preparation of flue gas desulfurizers from fly ash and Ca(OH)_(2) was deduced on the basis of solid phase reaction kinetic theory.Kinetic expressions and parameters were obtained and verified by experiment.A comparison of calculated results with experimental results showed that precision in kinetic expressions was good.The apparent reaction rate constants of the pozzolanic reaction could be raised by increasing the specific surface area of fly ash and the hydration temperature,and by using a suitable additive.
基金supported by the Research Funds for Young Stars in Science and Technology of Shaanxi Province (2019KJXX-098)China Post-Doctoral Science Foundation Funded Project (2018M640986)+1 种基金the Fundamental Research Funds for Central Universities (xtr042019019)the support of K.C. Wong Education Foundation
文摘The aim of this current work is to investigate the effects of operating parameters on heat transfer characteristics between gas and in-cylinder solid surfaces in a reciprocating compressor.A numerical model has been implemented in MATLAB based on mass balance,the first law of thermodynamics,and NIST REFPROP database for gas properties and thermodynamic relationships.The impacts of key parameters such as rotational speed,suction temperature,pressure ratio and suction pressure are particularly evaluated on heat transfer coefficient(HTC),heat flux(HF)and gas temperature.Results demonstrate that HTC increases markedly with the increase of rotational speed,pressure ratio and suction pressure,and decreases slightly with the increase of suction temperature;the instantaneous HF strengthens significantly with the increase of rotational speed,pressure ratio and suction pressure,whereas the mean HF magnitude transferred from gas to the wall decreases with the increase of rotational speed;the maximum gas temperature is more sensitive to suction temperature and pressure ratio.
