The injection of hydrogen-rich fuel into the blast furnace tuyere is highly significant for reducing carbon dioxide(CO_(2))emissions.However,the hydrogen-rich fuel injection can lead to insufficient kinetic energy of ...The injection of hydrogen-rich fuel into the blast furnace tuyere is highly significant for reducing carbon dioxide(CO_(2))emissions.However,the hydrogen-rich fuel injection can lead to insufficient kinetic energy of the blast and reduce pulverized coal combustion rate.To solve these problems,a method of coherent jet of hydrogen-rich fuel was developed,and the combustion process of the hydrogen-rich fuel and pulverized coal was simulated by coupling computational fluid dynamics and discrete phase method(CFD-DPM)in blast furnace tuyere.The effects of hydrogen content on the distributions of gas velocity,temperature,and species in the reaction region were systematically analyzed.Results indicate that high-temperature and low-density flame can be generated around the tuyere through hydrogen-rich fuel,which effectively restrain the attenuation of blast energy.Meanwhile,the coherent flame heats the hot gas and pulverized coal at the outlet of the tuyere,which is conducive to enhance the temperature of the reaction region and the burning rate of pulverized coal.The increase in hydrogen content within the hydrogen-rich fuel leads to a gradual contraction of the CO_(2) high concentration region at the center of the reaction region,while simultaneously expanding the high concentration region of water vapor(H_(2)O).展开更多
Eggshells,a by-product of the food industry,represent a significant yet often overlooked waste stream.Given their vast production volume and inherent properties,eggshells have the potential to serve as a sustainable a...Eggshells,a by-product of the food industry,represent a significant yet often overlooked waste stream.Given their vast production volume and inherent properties,eggshells have the potential to serve as a sustainable and environmentally friendly co-fuel.Aiming to explore the co-combustion characteristics and kinetics of pulverized coal blended with eggshells and offer insights into their combined use as a renewable energy source,a systematic investigation was conducted to evaluate the physical and chemical properties of Shangwan bituminous coal,Shouyang anthracite coal,eggshell(ES)and their blends.Additionally,comprehensive experimental analyses were performed at different heating rates applying a non-isothermal thermogravimetric method.The findings revealed that the addition of ES enhanced the combustion efficiency.The combustion characteristics were significantly influenced by the ES content,with an optimal blend ratio identified for maximum combustion efficiency.To represent the thermal degradation experiments,random pore model and volume model were employed.Furthermore,activation energies and pre-exponential factors were determined.The random pore model demonstrated more superior performance compared to the volume model.The activation energies of all the samples ranged between 18.29 and 42.48 kJ/mol,with the lowest value observed for the sample containing 20 mass%ES.展开更多
针对焦炉煤气、转炉煤气等工业高危负压系统(-5~-10 k Pa)泄漏检测难题,突破传统压力衰减法、人工巡检和气体传感器法的技术瓶颈,创新提出基于40 k Hz±1 k Hz低频超声波与红外热成像的多模态检测体系,研发磁吸式/柔性非接触式探头...针对焦炉煤气、转炉煤气等工业高危负压系统(-5~-10 k Pa)泄漏检测难题,突破传统压力衰减法、人工巡检和气体传感器法的技术瓶颈,创新提出基于40 k Hz±1 k Hz低频超声波与红外热成像的多模态检测体系,研发磁吸式/柔性非接触式探头构成的五传感器协同网络,结合改进型小波包降噪算法(信噪比提升12 d B)和时差定位法(TDOA),实现0.1 mm级泄漏孔径的精准识别,定位精度达0.5 m(较传统方法提升3倍),误报率<2%,检测效率提升16倍;构建327组特征频谱声纹数据库支持智能诊断系统开发。经太钢炼铁厂焦化工厂验证,泄漏事故率降低62%,年检测成本降低81%(每200 km管网检测费用为182.4万元),年减排CO_(2)达1.2万t。展开更多
基金the National Natural Science Foundation of China(Grant Nos.51874171,52074150,and 51974154)for the financial support of current work.
文摘The injection of hydrogen-rich fuel into the blast furnace tuyere is highly significant for reducing carbon dioxide(CO_(2))emissions.However,the hydrogen-rich fuel injection can lead to insufficient kinetic energy of the blast and reduce pulverized coal combustion rate.To solve these problems,a method of coherent jet of hydrogen-rich fuel was developed,and the combustion process of the hydrogen-rich fuel and pulverized coal was simulated by coupling computational fluid dynamics and discrete phase method(CFD-DPM)in blast furnace tuyere.The effects of hydrogen content on the distributions of gas velocity,temperature,and species in the reaction region were systematically analyzed.Results indicate that high-temperature and low-density flame can be generated around the tuyere through hydrogen-rich fuel,which effectively restrain the attenuation of blast energy.Meanwhile,the coherent flame heats the hot gas and pulverized coal at the outlet of the tuyere,which is conducive to enhance the temperature of the reaction region and the burning rate of pulverized coal.The increase in hydrogen content within the hydrogen-rich fuel leads to a gradual contraction of the CO_(2) high concentration region at the center of the reaction region,while simultaneously expanding the high concentration region of water vapor(H_(2)O).
基金sponsored by the Major Science and Technology Special Plan“Unveiling and Leading”Project of Shanxi Province(No.202201050201011)Major Science and Technology Projects of Anhui Province(No.202210700037)Special Funding for Science and Technology of China Minmetals Corporation(No.2021ZXD01).
文摘Eggshells,a by-product of the food industry,represent a significant yet often overlooked waste stream.Given their vast production volume and inherent properties,eggshells have the potential to serve as a sustainable and environmentally friendly co-fuel.Aiming to explore the co-combustion characteristics and kinetics of pulverized coal blended with eggshells and offer insights into their combined use as a renewable energy source,a systematic investigation was conducted to evaluate the physical and chemical properties of Shangwan bituminous coal,Shouyang anthracite coal,eggshell(ES)and their blends.Additionally,comprehensive experimental analyses were performed at different heating rates applying a non-isothermal thermogravimetric method.The findings revealed that the addition of ES enhanced the combustion efficiency.The combustion characteristics were significantly influenced by the ES content,with an optimal blend ratio identified for maximum combustion efficiency.To represent the thermal degradation experiments,random pore model and volume model were employed.Furthermore,activation energies and pre-exponential factors were determined.The random pore model demonstrated more superior performance compared to the volume model.The activation energies of all the samples ranged between 18.29 and 42.48 kJ/mol,with the lowest value observed for the sample containing 20 mass%ES.
文摘针对焦炉煤气、转炉煤气等工业高危负压系统(-5~-10 k Pa)泄漏检测难题,突破传统压力衰减法、人工巡检和气体传感器法的技术瓶颈,创新提出基于40 k Hz±1 k Hz低频超声波与红外热成像的多模态检测体系,研发磁吸式/柔性非接触式探头构成的五传感器协同网络,结合改进型小波包降噪算法(信噪比提升12 d B)和时差定位法(TDOA),实现0.1 mm级泄漏孔径的精准识别,定位精度达0.5 m(较传统方法提升3倍),误报率<2%,检测效率提升16倍;构建327组特征频谱声纹数据库支持智能诊断系统开发。经太钢炼铁厂焦化工厂验证,泄漏事故率降低62%,年检测成本降低81%(每200 km管网检测费用为182.4万元),年减排CO_(2)达1.2万t。
