Moisture detection calibration system, detection model establishment method and moisture detection method

Abstract

The embodiment of the present invention relates to a moisture detection and calibration system in gas containing hydrogen sulfide, a method for establishing a moisture detection model, and a moisture detection method; the moisture detection and calibration system includes a parallel humidification flow path, a drying flow path, and a hydrogen sulfide flow path. The hydrogen sulfide-containing moisture generator and the parallel frost point detection flow path, moisture detection flow path and vent flow path constitute a detection and venting flow path, and the moisture generator and the detection venting flow path are communicated through the main flow path; humidification The flow path includes a humidifier, the drying flow path includes a dryer, and the hydrogen sulfide flow path is used to pass in standard gas containing hydrogen sulfide with a known concentration; the frost point detection flow path includes a dew point meter, and the moisture detection flow path includes a Karl Fischer Coulomb moisture detector. Titrator, vent flow path for venting the inlet air. The system can be used to establish a moisture detection model in the gas containing hydrogen sulfide, can avoid the systematic error caused by the correction method when detecting the moisture in the gas containing hydrogen sulfide in the prior art, is simple and easy to implement, and has accurate results.

Description

technical field [0001] The invention belongs to the technical field of analysis and detection, and in particular relates to a moisture detection and calibration system for moisture detection in gas containing hydrogen sulfide, a method for establishing a moisture detection model, and a moisture detection method. Background technique [0002] In methanol (CH 3 OH) as the main component of anhydrous solvent, iodine (I 2 ), sulfur dioxide (SO 2 ) and water (H 2 O) according to reaction formula (1), react with the stoichiometric ratio of 1:1:1. This reaction is called Karl Fischer reaction. [0003] CH 3 OH+SO 2 +I 2 +H 2 O+3RN→[RNH]SO 4 CH 3 +2[RNH]I (1) [0004] In the above formula, RN is an organic base such as imidazole. [0005] The Karl Fischer Coulomb method generates iodine molecules through the electrolytic reaction to participate in the Karl Fischer reaction, and then calculates the amount of iodine by electrolytic electricity according to Faraday's law, t...

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Problems solved by technology

[0010] In order to solve the above-mentioned utilization Karl Fischer coulomb method to detect the moisture content in the gas containing hydrogen sulfide, the system error when calculating the anhydrous solvent system with the stoichiometric ratio of hydrogen sulfide and iodine reaction as 1: 1, there is moisture content detection inaccuracy Accurate technical problems, the embodiment of the present invention proposes a method for establishing a moisture detection model in gas containing hydrogen sulfide, including the following steps: S1, under the same detection conditions under multiple preset frost point values, Use the Karl Fischer Coulometric Moisture Titrator to detect the moisture content in a plurality of standard gas to be measured with known hydrogen sulfide concentration, use the first reagent to detect the moisture content in the standard gas to be measured, obtain the moisture detection value x, use the second reagent Detect the moisture content in the standard gas to be tested to obtain the moisture detection value y, and use the frost point value to calculate the standard value z of moisture in the standard gas to be tested, the standard gas to be tested is composed of hydrogen sulfide, water vapor and pure gas to be tested ; S2. Carry out function fitting according to each data point x, y, z to obtain a moisture detection model z=f(x, y) for detecting the moisture content in the gas containing hydrogen sulfide

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