A detection method using a gas measurement system

Abstract

The invention discloses a detection method using a gas measurement system, comprising the following steps: s1: arranging a sampling measurement system, which includes the following steps: s11: arranging a multi-rod matrix dilution probe with a fast bypass device; s12: arranging Backflushing calibration valve group; connect the dilution sampling probe, backflushing calibration three-way, backflushing solenoid valve and calibration solenoid valve through the sampling pipeline to form the probe backflushing and calibration gas transmission path; s13: Layout from sampling probe to sampling distribution The equal-length sample gas transmission pipeline at the unit interface; s14: Layout the internal gas path of the sampling and distribution unit: the sampling and distribution unit distributes the sample gas of each zone into two paths, and one path is connected to the mixing device; the mixed sample gas is fully mixed by the mixing device and then enters continuously. Mixed measurement analyzer; one way is connected to the regional inspection sampling group, and the sample gas of each partition enters the inspection analyzer in sequence through the inspection sampling group; s15: adjust the pipeline length of the mixed measurement analyzer and the inspection analyzer respectively, adjust Specific parameters such as mixed sample gas flow rate and patrol sample gas flow rate ensure the synchronization of zone patrol and mixed measurement; s2: install the control center; s3: the controller starts the uniform mixed sampling mode; s4: the controller starts the zone patrol mode ; s5: Test the synchronicity of zone inspection and uniform mixed sampling measurement, and put it into use after passing the test.

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...

AI Technical Summary

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.

Images