基于比例积分-双流法的湿度可调配气系统的研制

引用本文: 鲍珣, 张强领, 梁渠, 孙琴, 许伟, 邹雪, 黄超群, 沈成银, 储焰南. 基于比例积分-双流法的湿度可调配气系统的研制[J]. 分析化学, 2023, 51(3): 340-347. doi: 10.19756/j.issn.0253-3820.221110 shu

Citation: BAO Xun, ZHANG Qiang-Ling, LIANG Qu, SUN Qin, XU Wei, ZOU Xue, HUANG Chao-Qun, SHEN Cheng-Yin, CHU Yan-Nan. Development of Gas Dilution System with Humidity Control Function Using a Novel Proportion-integral Two-flow Method[J]. Chinese Journal of Analytical Chemistry, 2023, 51(3): 340-347. doi: 10.19756/j.issn.0253-3820.221110 shu

基于比例积分-双流法的湿度可调配气系统的研制

鲍珣 ^1,2, ,
张强领 ^{1,
,} ,
梁渠 ^1,2, ,
孙琴 ^1,2, ,
许伟 ^1,2, ,
邹雪 ^1, ,
黄超群 ^1, ,
沈成银 ^1,3, ,
储焰南 ^1,

1.
中国科学院合肥物质科学研究院健康与医学技术研究所, 医学物理与技术安徽省重点实验室, 合肥 230031;
2.
中国科学技术大学, 合肥 230026;
3.
合肥中科智谱科技有限公司, 合肥 230000

通讯作者: 张强领,E-mail:qlzhang@cmpt.ac.cn

基金项目:
国家自然科学基金项目(Nos.22076190,21876176)和中国科学院合肥物质科学研究院院长基金项目(Nos.BJPY2021B08,YZJJ2022QN45,YZJJZX202009)资助。

摘要: 浓度校准是气体分析仪器实现准确定量检测的前提,浓度校准需采用气体稀释系统。本研究将比例积分(Proportional integral,PI)算法与双流法结合,发展了一种新的湿度控制方法,即PI-双流法,并基于此建立了一套具有湿度调控功能的气体稀释新系统。首先,对系统中重要部件加湿器的性能进行考察,结果表明,加湿器出口处的相对湿度(Relative humidity,RH)存在一定波动(96%~103%),因此,本系统通过引入自整定PI控制算法来减小波动对整个系统湿度控制精度的影响。随后,对新系统的性能进行考察,结果表明,本系统的RH调控范围为5%~100%,RH准确度最高可达0.026% RH (25℃,100% RH),调节时间最快可达38 s (25℃,500 mL/min),可跟踪周期大于175 s的正弦输入。在不同温度和RH条件下,研究了湿度对PTR-MS反应离子分布的影响,结果表明,本系统可在较宽湿度范围(10%~100%)内满足进样流量大且连续进样气体分析仪器(如PTR-MS)的应用需求。本系统有望用于受湿度影响的气体测量仪器的校准。

关键词:

English

Development of Gas Dilution System with Humidity Control Function Using a Novel Proportion-integral Two-flow Method

1.
Anhui Province Key Laboratory of Medical Physics and Technology, Institute of Health and Medical Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2.
University of Science and Technology of China, Hefei 230026, China;
3.
Hefei Zhongkezhipu Technology Ltd, Hefei 230000, China

Corresponding author: ZHANG Qiang-Ling, qlzhang@cmpt.ac.cn

Received Date: 01 March 2022
Revised Date: 03 November 2022
Fund Project:
Supported by the National Natural Science Foundation of China (Nos. 22076190, 21876176) and the HFIPS Director′s Fund (Nos. BJPY2021B08, YZJJ2022QN45, YZJJZX202009).

Abstract: Concentration calibration is the premise of accurate quantitative detection of gas analyzer, and concentration calibration cannot be separated from gas dilution system. In this work, a novel wet gas preparation method (proportion-integral (PI) two-flow method) was established, and that a simple yet accurate gas dilution system with humidity control function based on PI two-flow method was developed, which was not affected by intermediate variables. Firstly, the performance of the humidifier, an essential part of the system, was investigated. The results showed that there was a certain fluctuation (96%-103%) in the relative humidity (RH) at the outlet of the humidifier. Therefore, the PI two-flow method was developed to reduce the influence of the fluctuation on the humidity control accuracy of the whole system. A dew point transmitter was used to measure the RH at the system′s outlet as a feedback signal to automatically adjust the ratio of dry and wet gas, thereby realizing accurate control of humidity. The wet gas was prepared by the following method, the dry gas passing through a self-made bubbling humidifier. Subsequently, the system′s response characteristics were investigated by step input and sinusoidal input under different flow rates and temperature conditions. The results showed that the RH control range of the system was 5%-100%. The flow rate of the system could be up to 1000 mL/min. The RH control accuracy could realize 0.026%RH (25 °C, 100%RH) (without considering the measurement deviation of the dewpoint transmitter). The setting time reached 38 s (25 °C, 500 mL/min). The system could track the sinusoidal input when the period was more than 175 s in 1000 mL/min. Finally, the application research of the system was implemented by using proton transfer reaction mass spectrometry (PTR-MS). As the RH of sampling air of PTR-MS gradually increased, the relative ratio of H₃O⁺ decreased, and the relative proportion of H₃O⁺(H₂O) increased. The above application showed that the new system could meet the application requirements of gas analysis instruments with large and continuous sampling flow rate in a wide humidity range (10%-100%). The new system would be expected to calibrate gas measurements instruments sensitive to humidity.

Key words:

Gas dilution system
/ Humidity controller
/ Proportional integral two-flow method
/ Proton transfer reaction mass spectrometry

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

基于比例积分-双流法的湿度可调配气系统的研制

通讯作者: 张强领,E-mail:qlzhang@cmpt.ac.cn

English

Development of Gas Dilution System with Humidity Control Function Using a Novel Proportion-integral Two-flow Method

Corresponding author: ZHANG Qiang-Ling, qlzhang@cmpt.ac.cn

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

基于比例积分-双流法的湿度可调配气系统的研制

通讯作者: 张强领,E-mail:qlzhang@cmpt.ac.cn

English

Development of Gas Dilution System with Humidity Control Function Using a Novel Proportion-integral Two-flow Method

Corresponding author: ZHANG Qiang-Ling, qlzhang@cmpt.ac.cn

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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