天然气液化装置中采用低温液力透平替代传统LNG或MR混合冷剂J-T节流阀实现节流降压是提高天然气液化装置效率的先进技术,也是全球天然气液化技术发展的一种趋势。我国目前已拥有超过136座的天然气液化工厂,但尚未实现低温液力透平的国...天然气液化装置中采用低温液力透平替代传统LNG或MR混合冷剂J-T节流阀实现节流降压是提高天然气液化装置效率的先进技术,也是全球天然气液化技术发展的一种趋势。我国目前已拥有超过136座的天然气液化工厂,但尚未实现低温液力透平的国产化和工业化应用。为此,通过对LNG液力透平工艺及控制系统开发、本体水力模型优化设计、样机结构设计与制造等关键技术进行攻关,开发了国内首套LNG液力透平系统(设计流量为40 m3/h),用于回收LNG冷箱出口LNG压力能。LNG液力透平系统在中海石油广东液化天然气有限公司天然气液化装置完成了系统启停、变流量、变转速多工况工业化测试。测试结果表明:1样机本体运转平稳,低温机械性能良好,运行性能参数基本达到设计预期;2工艺及控制系统、变频发电系统设计可行,可与已有天然气液化装置上的LNG产品J-T节流阀自动平稳切换使用,平均可提高LNG产量2%,发电8.3 k W。展开更多
本文采用频率变换原理采集输电线周围电场能量,设计了一种能量采集电路,对超级电容充电。负载阻抗呈电容性,为非线性负载,充电过程中阻抗不断变化。为实现最大输出功率传输,设计了低功耗的最大输出功率追踪(MPPT)电路,采用频率值为32.76...本文采用频率变换原理采集输电线周围电场能量,设计了一种能量采集电路,对超级电容充电。负载阻抗呈电容性,为非线性负载,充电过程中阻抗不断变化。为实现最大输出功率传输,设计了低功耗的最大输出功率追踪(MPPT)电路,采用频率值为32.768 k Hz石英晶体构成方波振荡电路,因电容电压不能突变,通过充电电流控制开关导通时间,构成电流反馈最大输出功率点追踪系统。最大输出功率追踪电路的工作电流为1.2 u A,工作电压为5 V,功耗为6 u W。实验结果表明,在充电36min时达到最大功率输出,储能电容电压的大小为0.32 V,输出功率最大为18 u W。相比于直接充电电路,最大输出功率电路的能量采集效率提高了50%。展开更多
Frequency modulation(FM)-to-amplitude modulation(AM) conversion is an important factor that affects the time±power curve of inertial confinement fusion(ICF) high-power laser facilities. This conversion can impact...Frequency modulation(FM)-to-amplitude modulation(AM) conversion is an important factor that affects the time±power curve of inertial confinement fusion(ICF) high-power laser facilities. This conversion can impact uniform compression and increase the risk of damage to optics. However, the dispersive grating used in the smoothing by spectral dispersion technology will introduce a temporal delay and can spatially smooth the target. The combined effect of the dispersive grating and the focusing lens is equivalent to a Gaussian low-pass filter, which is equivalent to 8 GHz bandwidth and can reduce the intensity modulation on the target to below 5% with 0.3 nm @ 3 GHz + 20 GHz spectrum phase modulation. The results play an important role in the testing and evaluating of the FM-to-AM on the final optics and the target, which is beneficial for comprehensively evaluating the load capacity of the facility and isentropic compression experiment for ICF.展开更多
文摘天然气液化装置中采用低温液力透平替代传统LNG或MR混合冷剂J-T节流阀实现节流降压是提高天然气液化装置效率的先进技术,也是全球天然气液化技术发展的一种趋势。我国目前已拥有超过136座的天然气液化工厂,但尚未实现低温液力透平的国产化和工业化应用。为此,通过对LNG液力透平工艺及控制系统开发、本体水力模型优化设计、样机结构设计与制造等关键技术进行攻关,开发了国内首套LNG液力透平系统(设计流量为40 m3/h),用于回收LNG冷箱出口LNG压力能。LNG液力透平系统在中海石油广东液化天然气有限公司天然气液化装置完成了系统启停、变流量、变转速多工况工业化测试。测试结果表明:1样机本体运转平稳,低温机械性能良好,运行性能参数基本达到设计预期;2工艺及控制系统、变频发电系统设计可行,可与已有天然气液化装置上的LNG产品J-T节流阀自动平稳切换使用,平均可提高LNG产量2%,发电8.3 k W。
文摘本文采用频率变换原理采集输电线周围电场能量,设计了一种能量采集电路,对超级电容充电。负载阻抗呈电容性,为非线性负载,充电过程中阻抗不断变化。为实现最大输出功率传输,设计了低功耗的最大输出功率追踪(MPPT)电路,采用频率值为32.768 k Hz石英晶体构成方波振荡电路,因电容电压不能突变,通过充电电流控制开关导通时间,构成电流反馈最大输出功率点追踪系统。最大输出功率追踪电路的工作电流为1.2 u A,工作电压为5 V,功耗为6 u W。实验结果表明,在充电36min时达到最大功率输出,储能电容电压的大小为0.32 V,输出功率最大为18 u W。相比于直接充电电路,最大输出功率电路的能量采集效率提高了50%。
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDA25020303)。
文摘Frequency modulation(FM)-to-amplitude modulation(AM) conversion is an important factor that affects the time±power curve of inertial confinement fusion(ICF) high-power laser facilities. This conversion can impact uniform compression and increase the risk of damage to optics. However, the dispersive grating used in the smoothing by spectral dispersion technology will introduce a temporal delay and can spatially smooth the target. The combined effect of the dispersive grating and the focusing lens is equivalent to a Gaussian low-pass filter, which is equivalent to 8 GHz bandwidth and can reduce the intensity modulation on the target to below 5% with 0.3 nm @ 3 GHz + 20 GHz spectrum phase modulation. The results play an important role in the testing and evaluating of the FM-to-AM on the final optics and the target, which is beneficial for comprehensively evaluating the load capacity of the facility and isentropic compression experiment for ICF.
