Method and device for directly reading and calculating concentration of particulate matters in gas based on beta-ray method

A particle concentration and beta-ray technology, which is used in measurement devices, particle suspension analysis, suspension and porous material analysis, etc., can solve the problems of long measurement time, prone to mechanical and manual errors, etc. The effect of avoiding mechanical errors and improving work efficiency

Inactive Publication Date: 2021-11-19
王庚
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Problems solved by technology

[0004] When using the gravimetric method to measure the concentration of particulate matter under working conditions, there are the following deficiencies: one is the length of time for measurement; since on-site sampling needs to be carried out in the laboratory for constant temperature and humidity treatment, drying and weighing, it usually takes 3-5 Only geniuses can get the calculation results, resulting in a long calculation time
[0006] Although this method, relative to the gravimetric method, solves the problems of long measurement time and prone to errors in manual operation to a certain extent, it still has the following shortcomings: First, the measurement time is long; The pumping process takes more than 30 minutes, and the calculation time is relatively long
[0010] Although this method solves the problems of long measurement time and prone to mechanical and manual errors to a certain extent, because this method believes that β rays do not attenuate in gaseous substances, it does not consider the influence of the mass attenuation of gaseous substances on the calculation data. It is believed that this calculation formula can directly obtain the concentration of particulate matter in the gas
But in fact, β-rays not only attenuate in solid substances, but also in gaseous substances. According to the formula 7 provided by this standard, the mixed concentration of gaseous substances and solid particles in the measured gas is calculated, that is, C=C 气 +C 固 , rather than the concentration of particulate matter in the gas, resulting in a large deviation between the calculation result and the gravimetric method, which affects the accuracy of the measurement result

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  • Method and device for directly reading and calculating concentration of particulate matters in gas based on beta-ray method
  • Method and device for directly reading and calculating concentration of particulate matters in gas based on beta-ray method

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Embodiment 1

[0065] The derivation of the calculation formula of particulate matter concentration in the gas of embodiment 1

[0066] This embodiment proposes a new calculation formula that can directly calculate the concentration of particulate matter in gas, that is, based on the attenuation not only in solid matter but also in gaseous matter, β-rays are used to irradiate both gas and solid states at the same time After separating the β-ray attenuation of the solid particles in the solid-gas mixture, the calculation formula for the particle concentration C in the gas is derived. The specific derivation process is as follows:

[0067] (1) Considering the attenuation of β-rays in gaseous substances and solid substances

[0068] Beta rays not only attenuate in solid substances, but also in gaseous substances. There are two mass attenuation coefficients for the attenuation of beta rays on gaseous substances containing particulate matter, namely: gaseous substance attenuation coefficient and ...

Embodiment 2

[0082] Embodiment 2 Method and device for direct reading measurement and calculation of particulate matter concentration in gas based on β-ray method

[0083] This embodiment includes the following steps, wherein step two can also be carried out prior to step one:

[0084] Step 1: Directly measure the radiation dose I of the gas containing particulate matter by the device based on the direct-reading measurement method of the concentration of particulate matter in the gas based on the β-ray method 2 , and measure the pressure P and temperature T of the measured gas at the same time. According to P, T, calculate I 1 . I 1 , I 2 The unit is V.

[0085] like Figure 4 As shown, the direct-reading method device for measuring and calculating the concentration of particulate matter in gas based on the β-ray method includes a housing 7, which is provided with an air inlet 5 and an air outlet 6, and the housing between the air inlet 5 and the air outlet 6 7 are connected to form...

Embodiment 3

[0090] Embodiment 3 Direct-reading method for measuring and calculating the concentration of particulate matter in gas based on the β-ray method

[0091] This embodiment describes in detail the calculation of the radiation dose I of the gas without particulate matter. 1 The method also includes the following two methods:

[0092] The first method: on-site calculation method

[0093] After measuring the pressure P and temperature T on site, I can be directly calculated on site 1 value. Specifically include the following steps:

[0094] S11. Under the standard experimental conditions, and at the set temperature T 定 and set pressure P 定 Under the condition, the radiation dose I of the gas without particulate matter is measured 定 , it can also measure the measured gas under different detection environments in terms of flue pollutant emissions, dust pollution working environment, atmospheric particulate matter monitoring, online pollutant real-time monitoring, etc. 定 value. ...

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Abstract

The invention discloses a method and a device for directly reading and measuring the concentration of particulate matters in gas based on a beta-ray method, and the method calculates the concentration of the particulate matters in the gas by using a formula. According to the device for directly reading and calculating the concentration of the particulate matter in the gas based on the beta-ray method, a gas inlet and a gas outlet are formed in a shell, the portion, between the gas inlet and the gas outlet, in the shell is communicated to form a ventilation channel, and a beta-ray emitting electrode and a beta-ray receiving electrode corresponding to the beta-ray emitting electrode are fixedly installed in the ventilation channel; and a temperature sensing probe and a pressure sensing probe are fixedly arranged in the ventilation channel. The measuring and calculating time of the particulate matter concentration can be greatly shortened, and the precision of the measuring and calculating result is improved. The device and the method are suitable for measuring and calculating the concentration of the particulate matters in the gas in the aspects of flue pollutant particulate matter emission, dust pollution working environment, atmospheric particulate matter monitoring, online pollutant real-time monitoring and the like under working conditions.

Description

technical field [0001] The invention belongs to the technical field of measurement and calculation of particulate matter concentration in gas, relates to the theory of mass attenuation of beta rays, and is directly applied to the detection of particle concentration under working conditions, and specifically relates to a method and device for direct reading measurement and calculation of particle concentration in gas based on the beta ray method. Background technique [0002] At present, there are mainly three methods for measuring the concentration of particulate matter in gas: [0003] 1. Weight method. When measuring the particle concentration in the gas by gravimetric method, use the sampling tube to extract a certain volume of particle-containing gas, use the filter cartridge to absorb the particles, and then take the filter cartridge containing the particles to the laboratory. After constant temperature and humidity treatment, use high-precision The balance is manually...

Claims

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Application Information

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IPC IPC(8): G01N15/06
CPCG01N15/06
Inventor 王庚谷彦武
Owner 王庚
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