Wide dynamic detection range of methane gas based on enhanced cavity absorption spectroscopy

Integrated cavity output spectroscopy(ICOS) is an effective technique in trace gase detection.The strong absorption due to the long optical path of this method makes it challenging in the application scenes that have large gas concentration fluctuation,especially when the gas concentration is high.In this paper,we demonstrate an extension of the dynamic range of ICOS by using a detuned laser combined with an off-axis integrating cavity.With this,we improve the upper limit of the dynamic detection range from 0.1%(1000 ppm) to 20% of the gas concentration.This method provides a way of using ICOS in the applications with unpredictable gas concentrations such as gas leak detection,ocean acidification,carbon sequestration,etc.

中部出气的上吸式固定床气化炉及其自动控制的料斗供料系统设计

改进的固定床上吸式生物质气化炉,以锥形下料裙将气化炉分成气化室与储料室两部分,出气口设在下料裙死角处。输出的产出气温度在300℃以上、灰分少、热值高,气化效率高,兼具上吸式与下吸式气化炉的优点,有效解决了常规上吸式气化炉产出气中焦油含量高、热值低问题。自动控制的料斗供料方式保证了气化炉运行的可靠性与安全性,扩展了生物质木料的适用范围。实现产出燃气在蒸汽锅炉中代替煤、木材、油燃烧,可有效解决中小企业的用能问题,达到节能减排的目的。

核电站电磁驱动型稳压器喷淋阀设计综述

[目的]电磁驱动型稳压器喷淋阀是压水堆核电机组的关键阀门之一,实现该阀门的自主化研发对于核电建设具有重要意义。[方法]文章从电磁驱动型稳压器喷淋阀的系统功能需求和技术参数要求出发,简要介绍了自主研发的电磁驱动型稳压器喷淋阀的整机结构、比例电磁铁、中置热防护装置、阀位信号检测与输出装置及先导式阀芯调节系统的结构设计等。[结果]通过本次自主化研发,掌握了电磁驱动型稳压器喷淋阀设计技术,解决了电磁驱动结构的技术难点和阀门高温高压介质的工况适应性问题,实现了电磁驱动型稳压器喷淋阀的系统功能。[结论]自主研发的电磁驱动型稳压器喷淋阀满足三代核电稳压器喷淋阀的发展需求,可推广应用。