Detection method using gas measurement system

Abstract

The invention discloses a detection method using a gas measurement system, which comprises the following steps: s1, arranging a sampling measurement system, comprising the following steps: s11, arranging a multi-rod matrix dilution probe with a quick bypass device; s12, arranging a blowback calibration valve group; connecting the dilution sampling probe, the blowback calibration tee joint, the blowback electromagnetic valve and the calibration electromagnetic valve through a sampling pipeline to form a probe blowback and calibration gas transmission path; s13, arranging an equal-length samplegas transmission pipeline from the sampling probe to the sampling distribution unit interface; s14, arranging an internal gas path of the sampling distribution unit: enabling the sampling distributionunit to distribute the sample gas of each partition into two paths, wherein one path is connected to a mixing device, and the mixed sample gas is mixed by the mixing device and then continuously enters the mixed measurement analyzer; wherein the other path is connected into a partition patrol sampling group, and the sample gas of each partition enters a patrol measurement analyzer in sequence through the patrol sampling group; s15, respectively adjusting the lengths of pipelines of the mixed measurement analyzer and the patrol measurement analyzer, adjusting specific parameters such as mixedsample gas flow and patrol measurement sample gas flow, and ensuring the synchronism of partition patrol measurement and mixed measurement; s2, installing a control center; s3, enabling the controllerto start a uniform mixing sampling mode; s4, enabling the controller to start a partition patrol mode; and s5, testing the synchronism of partition patrol and uniform mixed sampling measurement, andputting into use after the synchronism is qualified.

Description

technical field [0001] The invention relates to the technical field of denitrification matrix sampling and precise ammonia injection, in particular to a detection method using a gas measurement system. Background technique [0002] Thermal power plants have implemented denitrification and environmental protection for more than 10 years. With the further improvement of denitrification efficiency, due to the uneven distribution of NOX concentration fields at the SCR inlet and outlet of the denitrification system, the single-point sampling method of NOX at the SCR outlet of the denitrification system cannot extract representative gas samples. It reflects the NOX concentration value of the entire section, which is poorly representative, and at the same time, it is impossible to monitor the uneven distribution of pollutant concentration, which causes the problem of excessive denitrification and ammonia injection, resulting in shortened life of denitrification catalysts and increas...

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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, due to the uneven distribution of NOX concentration fields at the SCR inlet and outlet of the denitrification system, the single-point sampling method of NOX at the SCR outlet of the denitrification system cannot extract representative gas samples. It reflects the NOX concentration value of the entire section, which is poorly representative, and at the same time, it is impossible to monitor the uneven distribution of pollutant concentration, which causes the problem of excessive denitrification and ammonia injection, resulting in shortened life of denitrification catalysts and increased resistance of air preheaters in some power plants due to excessive ammonia injection. A series of problems such as high, hypertrophy of the pole line of the electrostatic precipitator, increased power consumption of the induction / supply fan, failure of the desulfurization slurry, and difficulty in lifting the load of the unit

[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 has timely response and accuracy to solve the problems of uneven NOx concentration field at the denitrification SCR outlet, poor representativeness of single-point measurement, lagging control and adjustment, and poor quality of automatic input that power plants are most concerned about.

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