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Measuring device for average concentration of particulate matter in air

A technology of average concentration and measurement device, which is applied in the direction of measurement device, particle suspension analysis, suspension and porous material analysis, etc. It can solve the problems of troublesome maintenance, small maintenance amount, and contamination of the optical system, and achieves convenient operation and simple structure Effect

Pending Publication Date: 2018-08-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The optical method measurement is easy to pollute the optical system and troublesome to maintain; the charge induction method is an online measurement method of particle mass concentration that has been paid attention to in the world for more than 10 years. Small and other advantages

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  • Measuring device for average concentration of particulate matter in air
  • Measuring device for average concentration of particulate matter in air
  • Measuring device for average concentration of particulate matter in air

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specific Embodiment

[0033] The linear discharge electrode 6 in the charging unit is 25 cm long and has a cross-sectional diameter of 0.2 cm. The cylindrical ground electrode 5 is 30 cm long and has a cross-sectional diameter of 10 cm. Wherein the linear discharge electrode 6 is connected with the power supply 9, the cylindrical grounding electrode 5 is grounded, and the 9 power supply 9 adopts the negative high-voltage power supply of the direct reading spectrometer of A037523. In the measuring unit, the inner cylinder 11 has a length of 30 cm and a cross-sectional diameter of 10 cm, and the outer cylinder 12 has a length of 30 cm and a cross-sectional radius of 15 cm. The electrometer 14 adopts the 3068B aerosol electrometer of the American TSI Group.

[0034] Charging stage: turn on the power supply 9, an uneven electric field is formed between the linear discharge electrode 6 and the cylindrical ground electrode 5, and under the action of the fan 17, the dusty air enters the charging unit at an...

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Abstract

The invention discloses a measuring device for average concentration of particulate matter in air. The device comprises a feeding unit and a measuring unit connected with the feeding unit, wherein a charge unit is arranged between the feeding unit and the measuring unit, and a power unit is arranged at an outlet of the measuring unit; the charge unit comprises a linear discharge electrode connected with a power supply as well as a cylindrical grounding electrode; the measuring unit is a Faraday cage and comprises a grounded outer cage and an inner cage connected with an electrometer, and the inner cage is coaxial with the outer cage; the feeding unit comprises a dust-containing air feeding valve and a filter connected with a clean air valve. The measuring unit determines the charge quantity based on the electrostatic induction principle, and the final stable value of the electrometer is the total charge quantity in the two stages. The dust concentration of the air can be calculated according to the relationship between the charge quantity and the concentration.

Description

technical field [0001] The invention relates to an electrical detection instrument for atmospheric environmental protection, in particular to a measuring device for the average concentration of particulate matter in the air. Background technique [0002] With the development of industrialization, the increase of automobiles and the increasing heating demand of residents, the air pollution has become more and more serious in recent years. One of the most notable indicators is the increase of inhalable particles in the air, which can be directly absorbed in the breathing process. Enter the respiratory tract of the human body and accumulate in the lungs. Long-term inhalation of the human body can cause various respiratory diseases such as pneumonia, asthma, and decreased lung function. Therefore, the first thing to control the air problem is to measure the concentration of particulate matter in the air, and high-precision measuring instruments are particularly important. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/06
CPCG01N15/06G01N15/075
Inventor 龙正伟李姗姗王怡文潘武轩
Owner TIANJIN UNIV