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热式气体质量流量计是测什么的?它的工作原理是什么?什么工况会运用到?

返回列表 来源:本站 发布日期: 2025-08-28 08:26:10


IMG_5086-1.jpg气体质量流量计.jpg热式气体质量流量计直接测量气体的质量流量。


· 不是体积流量:它不像涡轮或孔板流量计那样先测出流速或体积流量,再通过温度和压力补偿来换算成质量流量。

· 直接输出:它的输出信号(如4-20mA)直接对应于标准状态(如20°C, 101.325kPa)下的质量流量,单位通常是标准立方米每小时(Nm³/h)、标准升每分钟(SLM) 或千克每小时(kg/h)。


简单比喻:就像你直接称重一袋流动的沙子,而不是先测量沙子的体积再乘以密度。


它是如何测量的?—— 工作原理


其核心原理基于热传导,即“流动的流体会带走热量”。主要有两种测量方法:


1. 恒功率法(Constant Power Anemometry)


这种方法使用两个温度传感器(通常是铂RTD),一个加热,一个不加热。


· 结构:一个探头(参考探头)测量气体的实际温度(T1),另一个探头(加热探头)被电路加热到一个恒定的、高于气体温度的温差(ΔT),例如高出50°C。

· 过程:

  1. 当没有气体流动时(静止状态),两个探头之间的温差ΔT最大且稳定。

  2. 当气体开始流动时,流动的气体会“吹走”或“带走”加热探头的热量,导致其温度下降。

  3. 为了维持设定的恒定温差(ΔT),电路必须增加对加热探头的加热功率。

· 测量:仪器通过测量为维持恒定温差ΔT所需增加的加热功率(P) 来计算流量。

  · 气体流量越大,带走的热量越多,所需的加热功率P就越大。

  · 这个加热功率P与气体的质量流量(Qm)有明确的函数关系,通过校准后即可直接得出质量流量值。


2. 恒温差法(Constant Temperature Anemometry)


这种方法更常见于插入式热式流量计。它也只使用一个加热传感器,但其工作方式略有不同。


· 结构:同样有两个传感器,一个测量气体温度(T1),一个被加热。

· 过程:

  1. 加热传感器被电路加热并维持在一个恒定的绝对温度(T2),而不是恒定的温差。

  2. 当气体流动时,加热传感器的热量被带走,温度有下降的趋势。

  3. 电路会瞬间改变加热电流(I),以抵抗温度下降,维持其恒定温度T2。

· 测量:仪器通过测量维持加热传感器恒定温度所需的电流值(I) 来计算流量。

  · 气体流量越大,所需维持温度的电流I就越大。

  · 电流值I的平方(I²)与质量流量成正比。


总结两种方法:


· 恒功率法:保持温差不变,测功率的变化。

· 恒温差法:保持温度不变,测电流的变化。


无论哪种方法,其物理本质都是:测量流体流动导致的热量散失效应,并将该效应与流体的质量流量相关联。


主要优点


1. 直接测量质量流量:无需额外的温度、压力变送器和计算单元,节省成本和安装空间。

2. 宽量程比:通常可达100:1甚至1000:1,既能测很小的流量,也能测很大的流量,适用范围广。

3. 低压损:特别是插入式,管道内几乎没有阻挡件,对流体的压力影响极小,节能。

4. 响应速度快:对流量变化反应灵敏。

5. 可测量极低流速:对微小流量敏感,甚至能测量“泄漏流量”。

6. 对气体成分不敏感(在一定范围内):只要在出厂时针对某种气体进行了校准,就能准确测量。但如果气体成分变化很大,其热物理性质(比热容)改变,则需要重新校准。



主要缺点与注意事项


1. “专气专用”:出厂时通常针对一种特定气体(如空气、N₂、O₂、Ar等)进行校准。如果测量另一种比热容差异很大的气体,会产生显著误差,必须重新校准。

2. 对介质洁净度有要求:探头被粉尘、油污覆盖会影响散热效率,导致测量不准,需要定期清洁。

3. 不适用于液体:工作原理基于气体的热力学性质,液体和气体的比热容等特性差异巨大。

4. 对振动敏感:强烈的管道振动可能影响传感器工作或造成机械损伤。


---


典型应用领域


由于其独特优势,热式质量流量计广泛应用于:


· 压缩空气测量与泄漏检测:工厂压缩空气系统的能耗计量。

· 锅炉/燃烧器助燃空气测量:控制空燃比,提高燃烧效率。

· 燃气计量:测量天然气、沼气等。

· 半导体制造:测量高纯度特种工艺气体(如Ar, N₂, H₂)的精确流量。

· 环保监测:烟道气排放监测。

· ** HVAC**:通风管道中的空气流量测量。

· 实验室:需要精确控制气体流量的科研场景。


如有需要,请联系上海美续测控,021-6788-1626


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