Ship exhaust gas particulate matter dilution sampling system

Abstract

The invention discloses a ship exhaust gas particulate matter dilution sampling system including: a flue gas flow guiding apparatus, a flue gas diluting apparatus, a retention chamber for aging the flue gas, and a sampling apparatus. The flue gas flow guiding apparatus is connected to a chimney on a ship; the flue gas diluting apparatus is respectively connected to the flue gas flow guiding apparatus and the retention chamber; the sampling apparatus is connected to the retention chamber; the flue gas flow guiding apparatus is provided with a constant speed control mechanism, which enables the flow speed of flue gas at the position, whereat the flue gas flow guiding apparatus is connected to the chimney, to tend to be equal to the flow speed of surrounding flue gas. In the system, clean air is used for diluting the ship exhaust gas, so that a physical and chemical progress that the ship exhaust gas is emitted into atmosphere is simulated, thereby collecting and analyzing a particulate matter sample. The system can achieve constant-speed sampling to the flue gas, and can perform particulate matter dilution sampling to a chimney, on which a sampling hole is not reserved, of a ship. The system is convenient to install and detach and easy to operate and can complete sampling in a narrow space. The system has small size, is convenient to carry, is simple in operations and is suitable for in-situ application.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring, in particular to a diluted sampling system capable of collecting particulate matters of high-temperature tail gas discharged from ship chimneys without reserved sampling holes. Background technique [0002] With the prosperity and development of global shipping, ship exhaust emissions are one of the important pollution sources of ambient air in ports and near-shore areas. Pollutants such as carbon monoxide, sulfur dioxide, nitrogen oxides and particulate matter in ship exhaust can affect the climate, reduce air quality and endanger human health. Among them, particulate matter is one of the most serious pollutants, especially fine particulate matter (PM2.5), because of its large specific surface area, it can absorb various toxic and harmful substances, and is easily breathed into the human lungs. How to reasonably collect particulate matter in ship exhaust is helpful to understan...

AI Technical Summary

Problems solved by technology

[0003] For the collection of pollutants from mobile sources, direct sampling methods are often used, but related studies have found that direct collection of particulate matter in high-temperature flue gas will underestimate the emission of particulate matter, because high-temperature flue gas includes solid particles in addition to solid particles that are emitted into the atmosphere. Condensed particles formed in the process of dilution, cooling, condensation, etc., resulting in deviations in sampling results

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