Flue gas diluting sampling control system and method

Abstract

The invention discloses a flue gas diluting sampling control system and method. A flue gas collecting pipeline, a flue gas mixing cavity and a diluted gas supply device form a flue gas mixing and diluting system, one end of the flue gas collecting pipeline is used for collecting to-be-detected flue gas, the other end of the flue gas collecting pipeline communicates into the flue gas mixing cavity,the diluted gas supply device communicates into the flue gas mixing cavity through a diluted pipeline, a diluting cavity is formed in the lower end of the flue gas mixing cavity, and the lower end ofthe diluting cavity is provided with a plurality of sampling interfaces for connecting a monitoring instrument. The flue gas diluting sampling control system also comprises an auxiliary suction pumpand a second-stage diluting device connected with one of the sampling interfaces through a pipeline. A controller is used for acquiring the initial concentration of the to-be-detected gas through a first integrated sensor, and the flows of a diluting pump and the auxiliary suction pump are adjusted according to the measuring range of the sampling instrument connected to the lower end of the diluting cavity, so that the purpose of adjusting the gas concentration in the diluting cavity is achieved; and the purpose of automatically controlling the diluting ratio can be achieved according to the preset threshold.

Description

technical field [0001] The invention belongs to a flue gas treatment system, in particular to a flue gas dilution sampling control system and method. Background technique [0002] Atmospheric fine particulate matter (PM 2.5 ) source analysis process, it is very important to understand the chemical composition spectrum of PM2.5 directly emitted by major air pollution sources for the further use of numerical models to obtain a pollution source share rate of PM2.5 that is closer to the actual situation. When collecting biomass fuel boiler flue gas source samples under actual site conditions, due to the limitation of sampling time and industrial production process requirements, it is difficult to collect aerosol source samples with different combustion temperatures, and it is impossible to obtain chemical composition emission factors. Further more accurate assessment of the contribution of biomass boilers to PM2.5 brings great uncertainty. [0003] However, in the prior art, t...

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Problems solved by technology

When collecting biomass fuel boiler flue gas source samples under actual site conditions, due to the limitation of sampling time and industrial production process requirements, it is difficult to collect aerosol source samples with different combustion temperatures, and it is impossible to obtain chemical composition emission factors. Further more accurate assessment of the contribution of biomass boilers to PM2.5 brings great uncertainty

[0003] However, the existing technology can only rely on experience or pre-experiments to obtain the smoke concentration and adjust the dilution factor, and manual adjustment of the dilution factor will cause a large error

At the same time, the inconsistency of the measurement ranges of many subsequent devices makes it difficult to coordinate the sampling work

At the same time, due to the change of flue gas concentration and other reasons during the sampling period, a lot of manpower and material resources are required to monitor and adjust it, which is complicated to operate and wastes resources.

[0004] In the existing dilution sampling system, the dilution factor needs to be manually adjusted, and especially the dilution factor cannot be automatically changed according to the concentration of the pollutant source to adapt to the sampling instrument. It is difficult to keep multiple dilution sampling equipment in good working condition at the same time

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