Gas online analysis system for catalytic cracking process

Gas online analysis system for catalytic cracking process

Why choose the monitoring location for CEMS flue gas online monitoring system
The main reason is that the measurement of smoke and flow velocity requires a stable flow field. Turbulence and eddies in unstable flow fields can cause uneven distribution of smoke and result in drastic changes in flow velocity. Because the commonly used method for measuring smoke and dust is to measure a line or a section of a line, that is, to reflect the value of the entire measurement section by measuring the data of a line or a section of a line; The commonly used method for measuring flow velocity is to measure a single point, that is, to reflect the numerical value of the entire measurement section by measuring the data of one point. So if the data measured by the CEMS flue gas online monitoring system needs to be representative, reflect or approach the true value, it is necessary to choose a section with a relatively stable flue gas flow field. . _0 v; z& T/ K% @
2、 Regulations on the Monitoring Location of CEMS Smoke Online Monitoring System in National Standards
Installation location of particulate matter CEMS flue gas online monitoring system
1The particulate matter CEMS flue gas online monitoring system should be installed in representative locations that can reflect the condition of particulate matter, with priority given to vertical pipe sections
2. Located downstream of all particulate matter control equipment and with no air leakage at the monitoring location
3. The particle CEMS smoke online monitoring system based on optical principles is located at a measurement position without water droplets or mist, and is not affected by light
4. Easy for daily maintenance, easy to access installation location, sufficient space for cleaning optical lenses, checking and adjusting optical path accuracy, testing instrument performance, and replacing components.
5. The measurement position should avoid the bends and sections of the flue, and be set at a distance of not less than 4 times the diameter downstream of the bends, valves, and reducers, and not less than 2 times the diameter upstream of the above components. When the installation position cannot meet the requirements, a section with stable airflow should be selected as much as possible, but the length of the straight pipe section before the installation position must be greater than the length of the pipe section after the installation position.
Installation location of CEMS flue gas online monitoring system for gaseous pollutants;
1. Located at a location where gaseous pollutants are uniformly mixed, the concentration and emission rate of gaseous pollutants measured at that location can represent the emissions of fixed pollution sources.
2. Easy for daily maintenance, easy to access installation location, sufficient space for cleaning optical lenses, checking and adjusting optical path accuracy, testing instrument performance, and replacing components.
3. The installation location should be set at a nearby control device, where the concentration or emission rate of pollutants and pollutants may change. The downstream of the location should not be less than twice the diameter of the flue or pipeline.
4. Not less than half the diameter of the flue or pipeline upstream of the exhaust outlet or control device.
Installation position of continuous flow velocity measurement system
1. The installation location shall not affect the determination of particulate matter and gaseous pollutants in the CEMS flue gas online monitoring system
2. Easy for daily maintenance, easy to access installation location, sufficient space, convenient for testing instrument performance and replacing parts, etc.
3. The measurement position should avoid the bends and sharp changes in the cross-section of the flue, and be set at a distance of not less than 4 times the diameter downstream of the bends, valves, and reducers, and not less than 2 times the diameter upstream of the above-mentioned components