A fully automatic gas detection device and its application method

Abstract

The invention relates to a full-automatic gas detection device and an application method thereof. The device comprises a falling-film type gas absorption pipe and a colorimetric cell, wherein the colorimetric cell comprises a detection cell body and a reference cell body. The application method comprises the following steps that 1, detected gas flows upward from the bottom of a gas introduction pipe; 2, a stock absorption solution flows to a collector from the inner pipe wall; 3, the detected gas and the stock absorption solution are opposite in flowing direction and react with each other; 4, the absorbance of absorption liquid flowing out of the collector is detected through the detection cell body; 5, the absorbance of the stock absorption solution is detected through the reference cell body; 6, the difference between the absorbance of the absorption liquid and the absorbance of the stock absorption solution is directly related to the concentration of the detected gas. The full-automatic gas detection device and the application method thereof are great in adaptability, multiple types of strongly-reactant gas can be detected by adopting multiple types of absorption liquid, real-time detection can be conducted, and response time is short. In addition, the device is simple in structure, convenient to operate, high in detection precision, and the application method is quick, convenient and effective.

Description

technical field [0001] The invention relates to the field of gas analysis and detection, in particular to a spectrophotometric-based full-automatic gas detection device mainly used for the analysis and detection of highly reactive gases and an application method thereof. Background technique [0002] Strongly reactive gases, such as ammonia, carbon dioxide, hydrogen chloride, hydrogen fluoride, sulfur trioxide, sulfur dioxide, chlorine, ozone, hydrogen sulfide, etc., can be effectively measured by spectrophotometry after being absorbed by the reaction solution. Automatic spectrophotometry is an effective method for industrial on-line gas detection and has been widely used. However, the gas absorption tubes currently used for automatic spectrophotometry are generally based on orifice plate absorption tubes. Although this type of orifice plate absorption tube has high efficiency, it has a dead volume, that is to say, when the gas concentration changes suddenly , the change of...

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Problems solved by technology

The reason for the formation of dead volume is that there must be a certain volume of absorption liquid in the absorption tube, and each drop of absorption liquid is equivalent in kinetics, which makes the absorption liquid unable to respond to the instantaneous change of gas concentration

[0004] Some foreign products use a polymer porous membrane structure to prepare gas absorption tubes, so that the absorption liquid flows through one side of the membrane, and the measured gas flows through the other side of the membrane. This structure is simple and effective, but it has a fatal shortcoming. : The normal operation of the system depends on the surface tension of the membrane cannot be destroyed, so alcohol, aldehyde, sugar, polyvinyl alcohol, surfactant, organic amine, concentrated alkali, strong oxidizing acid, etc. cannot be used in the absorption liquid

At the same time, it must be ensured that the pressure difference on both sides of the membrane is not too large, and the system adaptability is poor.

[0005] Although there are many reports about the improvement of this instrument, and there are various improvements to the gas absorption tube, they are all out of the scope of the above-mentioned methods.

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