Particulate matter online dilution sampling measurement system and method

Abstract

The invention discloses a particulate matter online dilution sampling measurement system and method. A PM10 cyclone cutter, a PM2.5 cyclone cutter, a sampling gas-flow flowmeter, a primary diluter, asecondary diluter, a charge particle measurement device, a particulate matter filter, a flue gas flowmeter, a flue gas flow control valve and a sampling pump are orderly connected; compressed air provided by an air compressor is divided into three paths after entering a compressed air buffer and processing device: a dry and clean gas-flow path, a primary diluting gas-flow path and a secondary diluting gas-flow path; the drying cleaning gas-flow path leads to an inlet end of the dry and clean gas-flow ionization device, the primary diluting gas-flow path leads to a primary diluting gas-flow inlet of the primary diluter, and the secondary diluting gas-flow path leads to a secondary diluting gas-flow inlet of the primary diluter. The particulate matter online dilution sampling measurement system has obvious advantages that the particulate matter sampling measurement feedback is timely, the cooling and the diluting are enough, the pipeline clogging is avoided, the measurement result is accurate, and the system is long in stable running time.

Description

technical field [0001] The invention relates to the technical field of particulate matter detection, in particular to an on-line dilution sampling measurement system and method for particulate matter. Background technique [0002] Sampling and detection of flue gas particulate matter can not only be used for research on the generation and control characteristics of flue gas pollutants, but also plays an important role in the analysis of particle properties, the impact of air pollution, and source apportionment, especially in the removal performance of particulate matter and source apportionment. The field has great application prospects. [0003] Particulate matter is divided into captureable particulate matter and condensable particulate matter. Condensable particulate matter refers to particulate matter that is in a gaseous state in the flue gas environment and is formed after entering the atmosphere and undergoing a dilution and cooling process. At present, domestic samp...

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Problems solved by technology

[0005] At present, the particle sampling and measurement methods widely used in China are mainly based on the aerodynamic characteristics and filtration characteristics of particles. They are all online sampling and offline detection methods, which cannot reflect the sampling concentration of particles in real time. For example, the application number is 2015209117881, and the authorized announcement number is CN205120442U Chinese patent: fixed source flue gas particulate matter dilution method sampling system, which cannot reflect the sampling concentration of particulate matter in real time

[0006] In the current sampling process of flue gas particulate matter, especially for the sampling and detection process of ultra-low emission coal-fired units, due to the low concentration of particulate matter in the tail flue gas and the uneven distribution of particle concentration in the tail flue environment It is difficult to achieve better constant-speed sampling during the sampling process, so there is a deviation in the sampling of particulate matter in the flue gas, and the method of online sampling and offline detection is difficult to timely feedback the sampling deviation for immediate adjustment, and can only be adjusted through subsequent sample analysis. One-time sampling process, thus greatly increasing the load of sampling and detection work

In addition, in the current situation where the load of coal-fired units is unstable, it is easy to miss a good opportunity for sampling and testing, so that the sampling and testing results cannot accurately reflect the actual situation

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