Flue gas online monitoring system and monitoring method

Abstract

The invention relates to a smoke gas on-line monitoring system and a smoke gas on-line monitoring method, and aims at providing the smoke gas monitoring system and the monitoring method which have the advantages of being simple in structure, high in automation degree and accurate in monitoring. The system comprises a pitot pitometer, a smoke gas sampler, a particulate matter monitor, sampling pipelines and demarcating pipelines, wherein the pitot pitometer, the smoke gas sampler and the particulate matter monitor are all provided with anti-purging devices, signal receiving terminals of all the anti-purging devices are respectively connected with a central controller, and all the anti-purging devices are controlled by the central controller to regularly purge. Smoke gas collected by the smoke gas sampler successively passes through a first refrigerator, a gas filter, a second refrigerator and a membrane type filter, the collected smoke gas is cooled and filtered by the first refrigerator, the gas filter, the second refrigerator and the membrane type filter, and the rest smoke gas finally obtained is fed into a multicomponent gas analysis instrument to be analyzed and detected. For the system, whole calibrated pipelines and partial calibrated pipelines are also arranged, so that the analysis instrument in a line can be wholly calibrated and partially calibrated.

Description

technical field [0001] The invention relates to the technical field of gas pollution detection, in particular to an online flue gas monitoring system and a detection method. Background technique [0002] At present, with the continuous improvement of environmental protection requirements, in order to ensure that my country's key pollution source flue gas emission industries are developing in a green and pollution-free direction, industrial factories involving flue gas emissions have installed flue gas online monitoring systems, and use The flue gas online monitoring system performs real-time sampling and detection of the flue gas that needs to be discharged into the atmosphere, so as to avoid the discharge of toxic and harmful gases into the external environment. [0003] At present, most waste gas emission enterprises use the non-dispersive infrared absorption method to monitor pollutants. Analytical instruments analyze the concentration of pollutants in the flue gas, and th...

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Problems solved by technology

[0004] 1. For the detection and analysis of flue gas, it is necessary to remove the excess moisture in the flue gas in advance, otherwise the precipitation will react with some harmful gases in the flue gas when the appropriate temperature is reached, reducing the detection amount of harmful gases during detection and causing large errors. On the other hand, when the temperature drops and the water is liquefied, it will mix with the particles in the flue gas to form a paste and block the pipeline, which is difficult to clean;

[0005] 2. There are a lot of dust and particles in the flue gas. When the monitoring system is used for a long time, various monitoring equipment are prone to blockage. However, the existing back-purging equipment is relatively simple and intelligent, and it only depends on manual time. It is difficult to achieve the purpose of timely cleaning by purging, which often causes pipelines, affects the normal use of the monitoring system, and brings great losses to the enterprise;

[0006] 3. According to environmental protection requirements, all analytical instruments used in the whole process from flue gas sampling to analytical instruments must be calibrated in advance to achieve the purpose of calibrating each analytical instrument. In this way, the original sampler needs to store the standard The gas cylinders are connected to all the analytical instruments separately, so as to realize the whole process of calibration, which is not only cumbersome and complicated, but also increases the workload on site, and also increases the probability of high-pressure gas explosion, which is very inconvenient;

[0007] 4. In the process of sampling the flue gas, the flue gas flow rate is unstable, and the pressure of the flue gas passing through the analytical instrument varies greatly, resulting in a large detection error of the analytical instrument, and it is impossible to accurately analyze and detect the flue gas

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