化工学报 ›› 2023, Vol. 74 ›› Issue (10): 4343-4351.DOI: 10.11949/0438-1157.20230843

• 过程安全 • 上一篇    下一篇

低温氢气爆炸实验腔体预冷过程研究

邵翔宇1,2(), 蒋敏2, 杨晓静1, 蒲亮3, 雷刚1, 高建良2   

  1. 1.航天低温推进剂技术国家重点实验室,北京 100028
    2.河南理工大学安全科学与工程学院,河南 焦作 454003
    3.西安交通大学能源与动力工程学院,陕西 西安 710049
  • 收稿日期:2023-08-16 修回日期:2023-09-23 出版日期:2023-10-25 发布日期:2023-12-22
  • 通讯作者: 邵翔宇
  • 作者简介:邵翔宇(1983—),男,博士,讲师,shaoxy@hpu.edu.cn
  • 基金资助:
    航天低温推进剂技术国家重点实验室开放课题(SKLTSCP202210);中国博士后科学基金项目(2023M730985);河南省高等学校重点科研项目计划(23A620001);河南省高校基本科研业务费专项(NSFRF220422)

Study on the precooling process of an experimental chamber for low temperature hydrogen explosion

Xiangyu SHAO1,2(), Min JIANG2, Xiaojing YANG1, Liang PU3, Gang LEI1, Jianliang GAO2   

  1. 1.State Key Laboratory of Technologies in Space Cryogenic Propellants, Beijing 100028, China
    2.College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
    3.School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
  • Received:2023-08-16 Revised:2023-09-23 Online:2023-10-25 Published:2023-12-22
  • Contact: Xiangyu SHAO

摘要:

为了深入研究低温条件下受限空间内的氢气火焰传播规律及爆炸波特性,设计了爆炸腔体并对其预冷过程开展了研究。实验腔体采用双层结构,通过通入低温氮气来实现腔体预冷,以此保证低温氢气/空气预混气温度维持在设定实验温度。基于热力学基本理论,采用稳态法,建立了腔体预冷过程数学模型,分析了保温层与腔体壁厚对预冷过程的影响,探究了预冷介质流量对预冷时长、介质消耗量的影响规律。研究发现,保温层厚度达到30 mm时环境漏热显著降低;相较于10、5 mm壁厚工况,3 mm时预冷时长分别降低了70.11%、39.01%,消耗量分别降低了70.12%、39.00%;增大预冷介质流量,可以有效缩短预冷时长,但预冷介质消耗量的变化幅度不显著。

关键词: 氢, 安全, 爆炸, 低温氢气, 传热, 腔体预冷

Abstract:

To further study the characteristics of flame propagation and explosion wave properties of hydrogen in confined spaces under low-temperature conditions, an explosion chamber was designed, and its precooling process was undertaken. The experimental chamber was designed as a double-layer structure, and the low-temperature nitrogen gas was adopted as the precooling medium, to ensure the temperature of the premixed low-temperature hydrogen/air mixture can be maintained at the preset experimental condition. Based on the fundamental principles of thermodynamics, the steady thermal analysis approach was adopted, and a mathematical model of the chamber’s precooling process was established. The impacts of insulation layer thickness and chamber wall thickness on the precooling process were discussed, and the influences of precooling medium flow rate on precooling time and medium consumption were explored. The results revealed that, when the insulation layer thickness reached 30 mm, heat load from the environment significantly decreased. Compared with the 10 mm and 5 mm wall thickness conditions, the precooling time at 3 mm is reduced by 70.11% and 39.01% respectively, and the consumption is reduced by 70.12% and 39.00% respectively. Increasing the precooling medium flow rate can effectively shorten the precooling time, but the change in precooling medium consumption is not significant.

Key words: hydrogen, safety, explosion, low-temperature hydrogen, heat transfer, chamber precooling

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