Device and method for measuring PM 2.5 of specific places

Abstract

The invention discloses a device for measuring PM 2.5 of specific places. The device for measuring the PM 2.5 of the specific places is characterized in that the device for measuring the PM 2.5 of the specific places comprises a measuring container, two metal material dust collection plates are arranged on the inner wall of the measuring container in a parallel mode, the two dust collection pates are connected to the two ends of a measuring power source in parallel to enable the two dust collection plates to form a positive electrode and a negative electrode, an air inlet channel is further formed in the middle of one end of the measuring container, and an air outlet channel is formed in the other end of the measuring container; an ionization electrode is further arranged on the portion, located at the entrance of the air inlet channel, in the measuring container, and the ionization electrode and an ionization power source are connected to be used for ionizing intake air. The invention further discloses a method for measuring the PM 2.5 of the specific places. The method for measuring the PM 2.5 of the specific places adopts the device for measuring the PM 2.5 of the specific places to achieve detection. The device and method for measuring the PM 2.5 of the specific places have the advantages of being simple in structure, convenient to operate, low in cost and sensitive and stable in detection.

Description

technical field [0001] The invention relates to the technical field of air pollutant monitoring; in particular, it relates to a device and method capable of measuring PM2.5 in a specific place. Background technique [0002] With the smog weather that has appeared in northern my country in recent years, PM2.5 has entered people's daily life. The so-called PM2.5, also known as particulate matter that can enter the lungs, refers to the air with an aerodynamic equivalent diameter of less than or equal to 2.5 of particulate matter. Because it can be suspended in the air for a long time, and can enter the lungs with the respiration of the human body, it will cause serious harm to the health of the human body. Therefore, the measurement of PM2.5 has attracted widespread attention. At present, the commonly used methods for detecting PM2.5 mainly include the vibration balance method, X-ray method and light scattering method. Among the above methods: the disadvantage of the oscil...

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Problems solved by technology

Among the above methods: the disadvantage of the oscillating balance method is that auxiliary calibration equipment needs to be installed to calibrate the particle measurement results; The X-ray method realizes the measurement of particulate matter based on the two assumptions that the strips of the quartz sampling filter of the instrument are uniform and the physical characteristics of the collected PM2.5 particles are uniform, but the above two assumptions are generally not true in practice; Scattering method mainly measures the number concentration of PM2.5

The principles and operation steps of the above three measurement methods are relatively complicated. In response to the above situation, many methods relying on other principles to achieve measurement have appeared. Among them, the patent application number is 201410833878.3 and the name is "A method for measuring PM2.5 in specific places The device and method" discloses a device and method for measuring PM2.5 in a specific place. The device includes a particle emission unit, a pair of parallel plates, a plate-level voltage adjustment unit, a current measurement unit, and a CCD monitoring unit. The device According to the Millikan static oil drop experiment, the mass of all elementary charges contained in PM2.5 particles is measured, and the sum of all elementary charge masses is used as the weight of PM2.5 particles

Using this method for measurement can achieve high measurement accuracy and also consider the influence of various factors of gas-solid two-phase flow on the measurement results. 2.0 When the measurement effect is the best, it can accurately measure the elementary charge, and use this to measure PM2.5 with a particle size of 2.5 particles, it is difficult to guarantee that all the elementary charges can be accurately measured at this moment

In addition, the equipment and experimental operations used in this method are relatively complicated, which will cause certain difficulties in the measurement of PM2.5 in daily life and engineering practice

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