Intelligent dehumidification device of atmospheric particulate matter sampler

Abstract

The invention relates to an intelligent dehumidification device of an atmospheric particulate matter sampler. The intelligent dehumidification device is characterized by comprising a conical cover, an inverted U-shaped dehumidification device, a steel pipe and three humidity sensors, wherein a conical flow guide plate is arranged on the inner wall of the conical cover; a circular through hole for holding one of the humidity sensors is formed in the side surface of the conical cover; the conical cover is connected with a steel wire mesh through a thread; a first vertical section of the inverted U-shaped dehumidification device is sleeved with a condensing sleeve, and the bottom end of the first vertical section is connected with the conical cover; a second vertical section of the inverted U-shaped dehumidification device is sleeved with a heating sleeve, and the bottom end of the second vertical section is connected with the steel pipe; an arc section is provided with a circular through hole for holding another humidity sensor; the top end of the steel pipe is connected with the bottom end of the second vertical section; a circular through hole for holding the last humidity sensor is formed in the lower part of the steel pipe; a signal processing system in an electronic control system can judge humidity signals received from the three humidity sensors in real time and adjust the working states of the condensing sleeve and the heating sleeve by controlling the on or off of corresponding electronic power switches according to judgment results.

Description

technical field [0001] The invention relates to the technical field of intelligent dehumidification, in particular to an intelligent dehumidification device suitable for an atmospheric particle sampler used in a high-humidity high mountain environment. Background technique [0002] In scientific research on the atmospheric environment, especially when the moisture absorption and growth characteristics of atmospheric particles are carried out in high-humidity alpine background areas, the key to the success of the experiment is to directly obtain the physical and optical data of atmospheric particles in a dry state as much as possible. In addition, equipment such as atmospheric particle size spectrometers and single particle mass spectrometers are also very sensitive to the humidity of atmospheric particulate matter samples, which can easily lead to instrument failures, and thus require dehumidification of atmospheric particulate matter samples. Therefore, it is very common an...

AI Technical Summary

Problems solved by technology

[0003] At present, almost all atmospheric observation stations in my country are basically equipped with atmospheric particle dehumidification devices, which are classified according to the principle of dehumidification, mainly including four types: 1) The first type of heating dehumidification device, its main function is to pass through the jacket of the atmospheric particle sampling tube Resistance wire heating, but it is heated at a constant temperature regardless of the weather conditions, especially in dry and cold weather conditions, it is easy to cause a large loss of chemical components of volatile atmospheric particles, which seriously affects the measurement accuracy

2) The second type is the condensation dehumidification device, whose main function is to condense the atmospheric particulate matter sample through the outer cooler of the atmospheric particulate matter sampling tube, so that the water vapor in the sample is precipitated. The effect is limited, and basically cannot meet the dehumidification requirements of the atmospheric particle sampler

3) The third type is a silica gel dehumidification device. Its main function is to absorb the moisture in the hollow atmospheric particle sampling tube through silica gel, so as to achieve the dehumidification function. However, as the silica gel gradually fails, the dehumidification function will also appear greatly. In addition, because the silica gel hygroscopic part of the atmospheric particulate matter sampling tube is hollowed out and meshed, it is easy to cause atmospheric particulate matter to adhere, which will also seriously affect the measurement accuracy

4) The fourth is the Nafion diaphragm technology, which is also the latest dehumidification technology abroad. It absorbs moisture efficiently and quickly, but it needs additional dry gas to remove the water vapor adsorbed by the diaphragm. It is extremely inconvenient and costly for field experiments.

[0004] In summary, the above four dehumidification devices are not designed with humidity sensors, so it is impossible to judge whether the dehumidified atmospheric particle sample airflow meets the dehumidification requirements

Images