A Sampling System Capable of Realizing Constant Flow and Equal Speed ​​Sampling

Abstract

The invention relates to a sampling system capable of realizing constant-flow isokinetic sampling. The sampling system comprises a sampling detection device, a speed measurement device, a microprocessing system and an alarm device, wherein the sampling detection device comprises a novel sampling nozzle, a detecting system, a dryer and a constant-flow sucking pump; the novel sampling nozzle comprises adjustment pieces, sealing elements, a fixing ring and a connecting piece; the speed measurement device comprises an S-type pitot tube and a differential pressure transmitter. With the adoption of the sampling system for constant-flow isokinetic sampling, PM10 or PM2.5 and other particulate matters in stationary pollution source flue gas can be collected; the sampling nozzle does not need an additional control system and can be regulated in the bore diameter in a self-adaption manner along with velocity changes of flue gas, so that continuous and automatic isokinetic sampling can be realized by utilizing only one sampling nozzle within a wider flue gas velocity range and under the flue gas velocity fluctuation condition; besides, when constant-flow continuous sampling is carried out on the premise of meeting the isokinetic sampling principle, the invention further provides the relation between the bending rigidity value of the adjustment piece material of the novel sampling nozzle and the velocity range of the to-be-sampled flue gas.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring and belongs to sampling technology. The sampling system can realize continuous isokinetic sampling in a large flue gas flow range and fluctuating flue gas flow. Background technique [0002] At present, the smog problem is becoming more and more serious, which has aroused great concern from the society. PM in the air 2.5 The increase in particles is the main reason for the formation of smog. PM emissions from stationary sources 2.5 Particles are air PM 2.5 How to reasonably monitor the PM in the exhaust of fixed pollution sources 2.5 To formulate PM 2.5 Pollution control measures and emission standards are of great significance. Currently there is no separate PM 2.5 The sampling method of particulate matter is only the sampling method of total particulate matter. [0003] At present, there are GB / T 16157-1996, HJ / T 76-2007 and other relevant standards for the determinatio...

AI Technical Summary

Problems solved by technology

When sampling flue gas with different flow rates, the sampling nozzle needs to be replaced frequently

[0005] At the same time, there may be local fluctuations in the flue gas flow rate during the period of constant flow continuous sampling

Due to the fluctuation of flue gas flow rate, the sampling nozzle with fixed caliber may not achieve constant sampling

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