A gas measurement and control system and its application in denitrification flue gas detection

Abstract

The invention discloses a gas measurement control system, which comprises: a sampling probe, a sampling distribution unit, an analysis unit and a control center. Among them, the sampling probes are respectively set in each partition of the cross-section of the exit of the gas channel, and the sample gas of each partition reaches the interface of the sampling distribution unit continuously and at the same time through the sampling probe; Partition patrol sampling group, all the way connected to the mixing device; the mixed sample gas is fully mixed by the mixing device and then continuously enters the mixed test analyzer, and the sample gas of each partition enters the patrol analyzer in sequence according to the patrol rules through the patrol sampling group. Adjust specific parameters such as pipeline length, mixed sample gas flow rate, and patrol sample gas flow rate to ensure the synchronization of partition patrol and mixed measurement; the control center includes a controller and a big data-artificial intelligence control module, in which the sampling probe, sampling Distribution units, analysis units, etc. are controlled and connected to the controller. The big data-artificial intelligence control module uses the mixed measurement value as a "synchronous reference value" to evaluate the survey values ​​of each zone, completes the zone optimization control, and completes the control target based on the mixed measurement value Total optimization control.

Description

technical field [0001] The invention relates to the technical field of denitrification and environmental protection, in particular to a gas measurement and control system and its application in the detection of denitrification flue gas. Background technique [0002] Thermal power plants have implemented denitrification and environmental protection for more than 10 years. With the further improvement of denitrification efficiency, the NO X Influenced by uneven distribution of concentration field, NO at the outlet of denitrification SCR X The single-point sampling method cannot extract a representative sample gas and cannot reflect the NO of the entire section. X Concentration values ​​are poorly representative, and at the same time, it is impossible to monitor the uneven distribution of pollutant concentration, which causes the problem of excessive ammonia injection in denitrification, resulting in shortened life of denitrification catalysts in some power plants, increased r...

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Problems solved by technology

[0002] Thermal power plants have implemented denitrification and environmental protection for more than 10 years. With the further improvement of denitrification efficiency, the NO X Influenced by uneven distribution of concentration field, NO at the outlet of denitrification SCR X The single-point sampling method cannot extract a representative sample gas and cannot reflect the NO of the entire section X Concentration values ​​are poorly representative, and at the same time, it is impossible to monitor the uneven distribution of pollutant concentration, which causes the problem of excessive ammonia injection in denitrification, resulting in shortened life of denitrification catalysts in some power plants, increased resistance of air preheaters, and electrostatic precipitators due to excessive ammonia injection. A series of problems such as hypertrophy of the pole line, increased power consumption of the induced draft / supply fan, failure of the desulfurization slurry, difficulty in lifting the load of the unit, etc.

[0003] At present, there is an urgent need for a sampling measurement technology that can continuously monitor the evenly mixed flue gas at the outlet section of the denitrification SCR, and can simultaneously intelligently monitor the SCR outlet area. Combined with the optimization of the total amount of ammonia injection and the optimization of area inspection, the big data-artificial intelligence control technology can improve the spraying efficiency. Ammonia timely response and accuracy to solve denitrification SCR outlet NO that power plants are most concerned about X Problems such as uneven concentration field, poor representativeness of single-point measurement, hysteresis of control adjustment, poor quality of automatic input, etc.

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