Online monitoring system of ultralow-concentration smoke and analysis method thereof

Abstract

The invention belongs to the technical field of smoke detection and particularly relates to an online monitoring system of ultralow-concentration smoke and an analysis method thereof. The online monitoring system of ultralow-concentration smoke disclosed herein comprises a smoke sampling system, a gas pretreatment system, a dried compressed air generating system, a gas component analysis system, a temperature-pressure flow measuring system. The invention also discloses the analysis method relating to the online monitoring system of ultralow-concentration smoke. The online monitoring system of ultralow-concentration smoke and the analysis method have the advantages that the gas sampling system provides thermal treatment, dissolution loss of measured gas due to high-humidity environment in a flue is prevented effectively, flow speed measuring is stable and reliable, the flow speed can reflect working conditions better, the sample gas pretreatment system is researched and designed independently, the special material selected can remove moisture in smoke within a short time, gas component loss is avoided, operation configuration software has a friendly interface, data are visually displayed, and operation is simple and feasible for a user.

Description

technical field [0001] The invention belongs to the technical field of flue gas detection, and in particular relates to an online monitoring system and analysis method for ultra-low concentration flue gas. Background technique [0002] Smoke is a mixture of gas and smoke and is the main cause of air pollution in residential areas. The composition of flue gas is very complex, including water vapor, SO 2 , N 2 , O 2 , CO, CO 2 Hydrocarbons and nitrogen oxides, etc., and smoke includes fuel ash, coal particles, oil droplets, and high-temperature cracking products. Therefore, the pollution of flue gas to the environment is the compound pollution of various poisons. The harmfulness of smoke to the human body is related to the size of the particles. The most harmful to the human body is the floating dust with a diameter of less than 10 microns, especially the most harmful dust of 1-2.5 microns. Therefore, the flue gas must be treated and discharged into the atmosphere, and t...

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Problems solved by technology

[0008] Flue gas monitoring by cold dry method, the main difficulty lies in the loss of the measured components in the flue gas

Due to the moisture contained in the flue gas, in the process of water vapor changing from gaseous state to liquid state, the liquid water will dissolve and chemically react with the components to be measured, resulting in the loss of the gas to be measured, resulting in a decrease in the concentration

Especially in the case of the low concentration of the measured gas components, the data error caused by this loss cannot be ignored, and it becomes the main reason for the excessive deviation of the measured data;

[0009] On-line monitoring of flue gas by thermal wet method usually uses a jet pump as a sampling device. In some industrial sites, the flue gas contains a large amount of dust due to processing problems. In addition, the humidity of the flue gas is high, and the dust particles will interact with water. The new optical measurement system of the analytical instrument has a great impact, which affects the measurement accuracy of the analytical instrument and leads to large errors in the measurement data;

[0010] The optical measuring element of the in-situ measurement is located in the flue. Due to the complex gas composition in the flue, high particle content, high moisture content and other factors, the measurement optical components are easily polluted, resulting in large measurement errors in the in-situ measurement.

At the same time, because the optical system is an open optical path, the measurement accuracy cannot be calibrated, which also leads to large errors when this method measures ultra-low concentration pollutant components

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