Sensor-based gas-phase molecular absorption spectrograph applying water seepage absorption drying device

Abstract

The invention discloses a gas-phase molecular absorption spectrograph applying a water seepage absorption drying device. The gas-phase molecular absorption spectrograph comprises a fluid circuit module, a gas circuit module, a detection module and a control module, wherein the control module is used for sending control signals to the fluid circuit module, the gas circuit module and the detection module and also can receive feedback data signals from the fluid circuit module, the gas circuit module and the detection module; the detection module comprises a sensor and a detector; the water seepage absorption drying device is arranged in front of the sensor; and the water seepage absorption drying device is a Nafion tube. The gas-phase molecular absorption spectrograph disclosed by the invention can effectively remove water and alcohols interfering detection; driving force of a Nafion material is from a vapor pressure gradient inside and outside the tube but not pressure difference or temperature difference, so that the achieved dehumidifying effect is far better than that of an existing condensation dehumidification scheme; and meanwhile, a phase change factor does not exist in a vapor absorption process, a dehumidification process does not cause extra influence on a gas delivery environment, and the condition that gas is re-dissolved in condensation or a pipeline is blocked can be avoided.

Description

technical field [0001] The invention belongs to the field of instrument analysis, in particular to a gas phase molecular absorption spectrometer based on a sensor and using a water seepage absorption drying device. Background technique [0002] Gas-phase molecular absorption spectrometer is an instrument for water quality analysis using gas-phase molecular absorption spectroscopy. Currently, there are ammonia nitrogen (HJ / T195-2005), Kjeldahl nitrogen (HJ / T196-2005), nitrite nitrogen (HJ / T197- 2005), nitrate nitrogen (HJ / T198-2005), total nitrogen (HJ / T199-2005), and sulfide (HJ / T200-2005) are 6 measurement items that meet the standard methods of the Ministry of Environmental Protection. Mercury (HJ597-2011) cold atomic absorption method determination and sulfite, potassium permanganate index (COD Mn ), chloride ion, bromide ion, iodide ion, cyanide, sulfur dioxide, nitrogen dioxide and other indicators can be detected by literature methods. [0003] Gas-phase molecular ab...

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Problems solved by technology

However: some gases to be tested may be reabsorbed by water vapor condensation caused by low temperature, resulting in low test results; low temperature may cause water vapor condensation to freeze, resulting in blockage of condensation pipes, making the detection impossible; due to the heat transfer efficiency of materials, Due to the working efficiency of the low-temperature generator and other factors affecting the environment, it is difficult to accurately control the temperature inside the condensation dehumidification pipeline, resulting in inconsistencies in the target dew point of the water vapor-containing gas flowing through the dehumidification pipeline, which may easily lead to a gap in the moisture content of the dehumidified gas , when performing high-precision detection, it is easy to cause deviations in the results, and the long-term accumulation of impurities such as water vapor, acid, alcohol, etc. can also easily cause sensor "poisoning", reducing detection accuracy and sensor life

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