Handheld type flue gas detector based on in-situ hot-wet method

Abstract

A handheld type flue gas detector based on an in-situ hot-wet method comprises a constant-temperature heating in-situ gas monitoring unit and a handheld type gas analyzer main unit, wherein the constant-temperature heating in-situ gas monitoring unit adopts a long-cylinder structure, the handheld type gas analyzer main unit adopts a square box structure, and the constant-temperature heating in-situ gas monitoring unit is fixedly connected with and arranged on one side surface of the handheld type gas analyzer main unit.

Description

technical field [0001] The invention relates to the technical field of gas monitoring, in particular to a hand-held in-situ thermal and wet flue gas detector, which is used for SO2 / NO / NO2 / NH3 / CS2 in ultra-low emission flue gas of boilers or kilns / COS and other gas concentration monitoring. Background technique [0002] The current domestic portable flue gas testers mostly use electrochemical sensors or non-dispersive infrared optical sensor measurement methods, because: [0003] 1. Conditions of use of electrochemical sensors - the temperature of the gas chamber of the sensor should not exceed 40 degrees, and moisture will affect SO 2 , NO 2 According to the test results, most domestic and foreign manufacturers have adopted measures such as heating and heat preservation at 110 degrees - rapid condensation and water removal to improve test accuracy. This method partially solves the problem of water vapor condensation and absorption of SO 2 , NO 2 As a result, the sulfur...

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Problems solved by technology

This method partially solves the problem of water vapor condensation and absorption of SO 2 , NO 2 As a result, the sulfur dioxide\nitrogen dioxide gas test is inaccurate, but the condensed water still has to absorb sulfur dioxide\nitrogen dioxide, which makes the measurement result low

[0004] 2. The working principle of the non-dispersive infrared sensor is that the vibration-rotation spectrum signal between the molecular bonds of the gas absorbs the infrared light of the same frequency, and the infrared spectrum absorption signal generated by it is 1-2 orders of magnitude lower than the ultraviolet-visible spectrum, so the market Mainstream SO on 2 , The range of NO sensors is mostly 0-1000ppm, and the zero drift is about 10ppm at 1% FS, which is not applicable to the current domestic ultra-low emission monitoring

[0007] b. The ultraviolet-visible spectrum absorption flue gas analyzer using White cell or Horite gas absorption cell, although the optical path is increased, but due to the limitation of the reflectivity of the coating material, the ultraviolet light before 210nm has passed through many times After reflection, the intensity is greatly attenuated, and NH cannot be measured 3 and other gases, and the volume of the White cell is larger than the reentrant Dove prism absorption cell, so that the T of the instrument 90 and T 10 increase

[0008] C. The portable instrument is bulky and not easy to carry, and there are too many connections between the host and the detector or preprocessor, making the on-site operation complicated

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