Abstract

Disclosed are a method and an apparatus for simultaneously measuring the mass concentration of particulate matter with different particle sizes with high precision. The method is used to measure particulate matter in the air in different ranges of particle sizes based on the laser scattering principle, and comprises the following steps: S1: calculating a correction factor for the amount of particulate matter with a small particle size that has been misidentified as particulate matter with a large particle size; and S2: correcting the measured amount of the particulate matter with a small particle size and the measured amount and mass concentration of the particulate matter with a large particle size according to the correction factor. The method can eliminate the cross-interference between the particulate matter in different ranges of particle sizes. The corresponding apparatus is of a simple structure and can realize simultaneous on-line measurement of PM1.0, PM2.5 and PM10 with high measurement precision and low costs.

IPC Classes  ?

• G01N 15/06 - Investigating concentration of particle suspensions

Abstract

2, and calculating the calorific value of the coal gas.

IPC Classes  ?

• G01N 27/26 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variablesInvestigating or analysing materials by the use of electric, electrochemical, or magnetic means by using electrolysis or electrophoresis
• G01N 21/3504 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
• G01N 33/22 - FuelsExplosives
• G01N 7/18 - Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by allowing the material to react

Abstract

A coal gas component and calorific value measurement method, comprising the following steps: utilizing a non-dispersive infrared technology, and selecting narrowband optical filters with the center wavelength (CWL)/half width bandwidth (HWBP) proportions of 4.66±0.05μm/90±5nm, 4.26±0.05μm/120±5nm, 7.85±0.05μm/180±5nm, and 3.46±0.05μm/120±5nm respectively to measure the volume concentrations of CO, CO2, CH4 and CnHm in the coal gas; utilizing a thermal-conductive gas sensor to measure the volume concentration of H2; utilizing an electro-chemical sensor to measure the volume concentration of O2; utilizing the measured CH4 value to correct the measured CnHm result; and utilizing the measured CO2 and CH4 values to correct the measured H2 result, thus obtaining the accurate CO, CO2, CH4, CnHm, H2, O2 content of the coal gas; and utilizing the measured CO and CH4 values and the corrected H2 and CnHm volume concentrations to calculate the calorific value of the coal gas. The present method achieves rapid and accurate measurement of the components and calorific value of multi-component coal gas with one apparatus.

IPC Classes  ?

• G01N 21/35 - Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
• G01N 7/00 - Analysing materials by measuring the pressure or volume of a gas or vapour