A kind of layout method of gas measurement system

Abstract

The invention discloses a method for laying out a gas measurement system, which includes the following steps: s1: laying out a sampling probe, wherein, one sampling probe is arranged in each section of the cross section of the gas channel or at the exit of the gas channel to form matrix sampling, The sampling flow rate of the sampling probes in each partition is consistent; s2: Arrange the sample gas transmission pipeline connecting the sampling probes of each partition to the interface of the sampling distribution unit; device, the mixed sample gas is fully mixed by the mixing device and then continuously enters the mixed measurement analyzer; all the way is connected to the sub-regional survey sampling group, and the sub-regional sample gas enters the survey analyzer in sequence through the patrol sampling group; s4: install the controller, use The controller is respectively connected with the matrix sampling probe and the sampling distribution unit, and the controller is connected with the control center of the ammonia injection device through communication or hard wiring. The layout method of the gas measurement system of the present invention can form matrix sampling, and by adjusting specific parameters such as pipeline length, mixed sample gas flow rate, patrol sample gas flow rate, etc., the partition patrol survey and mixed measurement can be carried out synchronously, and the mixed data is continuous and representative. Strong performance and high partition inspection efficiency.

Description

technical field [0001] The invention relates to the technical field of denitrification and environmental protection, in particular to a method for laying out 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, 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 precip...

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, 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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