Shot cokes are frequently formed in the delayed coking unit treating the super viscous oil at PetroChina＇s Liaohe Petrochemical Company. Considerable work has been carded out to avoid the formation of shot cokes. The...Shot cokes are frequently formed in the delayed coking unit treating the super viscous oil at PetroChina＇s Liaohe Petrochemical Company. Considerable work has been carded out to avoid the formation of shot cokes. The test results obtained have shown that the property of super viscous oil has played a key role in the formation of shot cokes. After adjusting and optimizing the process indices the operating regime of the delayed coking unit at a throughput of 118t/h of the super viscous oil is specified as follows： a reaction temperature of 498-502℃, a reaction pressure of 0.17-0.25 MPa, a recycle ratio of 0.5-0.6 and a fractionation tower bottom temperature of 355-365 ℃. In the meantime, the delayed coking process has adopted measures to enhance pre-fractionation of the feedstock to rationally remove light fractions and maintain a steady gas velocity in order to avoid the formation of shot cokes.展开更多
Quantum memories are essential for photonic quantum technologies,enabling long-distance quantum communication and serving as delay units in quantum computing.Hot atomic vapors using electromagnetically induced transpa...Quantum memories are essential for photonic quantum technologies,enabling long-distance quantum communication and serving as delay units in quantum computing.Hot atomic vapors using electromagnetically induced transparency provide a simple platform with second-long photon storage capabilities.Light-guiding structures enhance performance,but current hollow-core fiber waveguides face significant limitations in filling time,physical size,fabrication versatility,and large-scale integration potential.In this work,we demonstrate the storage of attenuated coherent light pulses in a cesium(Cs)quantum memory based on a 3D-nanoprinted hollow-core waveguide,known as a light cage(LC),with several hundred nanoseconds of storage times.Leveraging the versatile fabrication process,we successfully integrated multiple LC memories onto a single chip within a Cs vapor cell,achieving consistent performance across all devices.We conducted a detailed investigation into storage efficiency,analyzing memory lifetime and bandwidth.These results represent a significant advancement toward spatially multiplexed quantum memories and have the potential to elevate memory integration to unprecedented levels.We anticipate applications in parallel single-photon synchronization for quantum repeater nodes and photonic quantum computing platforms.展开更多
文摘Shot cokes are frequently formed in the delayed coking unit treating the super viscous oil at PetroChina＇s Liaohe Petrochemical Company. Considerable work has been carded out to avoid the formation of shot cokes. The test results obtained have shown that the property of super viscous oil has played a key role in the formation of shot cokes. After adjusting and optimizing the process indices the operating regime of the delayed coking unit at a throughput of 118t/h of the super viscous oil is specified as follows： a reaction temperature of 498-502℃, a reaction pressure of 0.17-0.25 MPa, a recycle ratio of 0.5-0.6 and a fractionation tower bottom temperature of 355-365 ℃. In the meantime, the delayed coking process has adopted measures to enhance pre-fractionation of the feedstock to rationally remove light fractions and maintain a steady gas velocity in order to avoid the formation of shot cokes.
基金supported by the German Research Foundation(DFG),projects SCHM2655/15-1,SCHM2655/22-1,SCHM2655/21-1,BE2224/19-1the Federal Ministry of Education and Research(BMBF),project 16KISQ003.
文摘Quantum memories are essential for photonic quantum technologies,enabling long-distance quantum communication and serving as delay units in quantum computing.Hot atomic vapors using electromagnetically induced transparency provide a simple platform with second-long photon storage capabilities.Light-guiding structures enhance performance,but current hollow-core fiber waveguides face significant limitations in filling time,physical size,fabrication versatility,and large-scale integration potential.In this work,we demonstrate the storage of attenuated coherent light pulses in a cesium(Cs)quantum memory based on a 3D-nanoprinted hollow-core waveguide,known as a light cage(LC),with several hundred nanoseconds of storage times.Leveraging the versatile fabrication process,we successfully integrated multiple LC memories onto a single chip within a Cs vapor cell,achieving consistent performance across all devices.We conducted a detailed investigation into storage efficiency,analyzing memory lifetime and bandwidth.These results represent a significant advancement toward spatially multiplexed quantum memories and have the potential to elevate memory integration to unprecedented levels.We anticipate applications in parallel single-photon synchronization for quantum repeater nodes and photonic quantum computing platforms.
