Sampling system and method for filterable particles and condensable particles

Abstract

The invention discloses a sampling system and method for filterable particles and condensable particles, which belong to the technical field of environmental monitoring. The system comprise a samplingnozzle, a sampling gun, a filterable particle collection device, a condensable particle constant temperature sampling tube, a sample collection bottle, a dryer, a flow monitoring and controller and an air pump. The system can accurately and efficiently collect filterable particles and condensable particles in sample gas. The whole system is maintained at a preset temperature throughout the entireprocess to ensure the uniformity of the form of condensable particles, and at the same time prevent the adsorption loss of condensable particles caused by condensation and the like. The device has the advantages of reasonable structure design and complete function. The temperature of each part of the system can be controlled to meet the sampling needs of various occasions. The system is flexibleand convenient, has high sampling efficiency, and fills the gap in collection and monitoring of filterable particles and condensable particles.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a sampling system and method for filterable particulate matter and condensable particulate matter. Background technique [0002] Particulate matter emissions from stationary pollution sources have a huge impact on the environment, among which particulate matter includes filterable particulate matter and condensable particulate matter. After the filterable particles are discharged into the atmosphere, they become one of the important components of air PM2.5. Condensable particulate matter usually exists in the form of condensation nuclei, with an aerodynamic diameter of less than 1 micron, belonging to fine particulate matter, and its chemical composition includes soluble salts, volatile organic compounds, sulfur trioxide, heavy metals, etc. Condensable particulate matter exists in a gaseous state before being discharged into the atmosphere, and conde...

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Problems solved by technology

[0004] 1. The temperature range of the sampling place of fixed pollution sources is wide, and the temperature of the general sampling position ranges from 50°C to 150°C. If the flue gas temperature is too low, it will easily lead to premature condensation of condensable particles, and the representativeness of the collected samples will be poor; if the flue gas temperature is too high, it will easily 2. In the environment with high dust content of fixed pollution sources, smoke and dust will absorb condensable particles, which will seriously block the sampling and detection system. Representative condensable particles collected in high-dust environments are less Difficult; 3. The current online particle monitoring system feeds back the total particle concentration value according to the change of transmitted light absorbance, and does not distinguish the types of particles

Moreover, the emitted light intensity of the online particle monitoring system is prone to deviations in practical applications, resulting in inaccurate monitoring of particle concentration data; 4. Condensable particles are complex in composition, unstable in nature, easy to combine with smoke and dust, and sensitive to temperature; 5 .Filterable particles will adsorb condensable particles, resulting in deviations in sampling and measurement results, and it is difficult to separate filterable particles and condensable particles

[0005] At present, there is no reliable monitoring and sampling equipment for filterable particulate matter and condensable particulate matter in stationary pollution sources in the world

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