Multipoint cyclic switching sampling analysis system and method based on Kriging interpolation method

Abstract

The invention relates to a multipoint cyclic switching sampling analysis system based on a Kriging interpolation method. The multipoint cyclic switching sampling analysis system comprises a pluralityof sets of sampling paths, an analysis path, a blowback path, an emptying path, a calibration path and a diluent gas path, each set of sampling path comprises a sampling path flow meter front isolating valve, a sampling path flow meter and a sampling path flow meter rear isolating valve which are connected in sequence; the analysis path comprises an analysis path isolating valve, an analysis pathflow meter, an analysis path back-flushing three-way valve, a dilution unit, an NOx sensor and a buffer tank which are connected in sequence; the analysis path isolating valve is connected to each sampling path flow meter rear isolating valve through an emptying path three-way valve. The multipoint cyclic switching sampling analysis system has the advantages that a small number of analysis units are connected with a large number of sampling branches in a one-driving-N mode, smoke extracted by all the sampling branches is sampled and analyzed in a cyclic manner within a short period, and thus distribution of all fields of the whole sampling section is reflected more comprehensively.

Description

technical field [0001] The invention relates to a sampling analysis system, in particular to a multi-point itinerant switching sampling analysis system and method based on Kriging interpolation method. Background technique [0002] Coal-fired power plants mainly use SCR (Selective Catalytic Reduction) denitrification technology to treat nitrogen oxides (NOx) in flue gas. In the SCR denitrification reaction, NH3 and NOx react under the action of the catalyst to generate N2 and H2O, so as to achieve the purpose of removing NOx in the flue gas. The SCR denitrification reaction needs to be carried out under precise and reasonable control under the denitrification system. The denitrification system mainly includes: ammonia gas generation system, dilution air supply system, denitrification reactor, flue gas sampling and analysis system, ammonia injection system and other auxiliary systems. Among them, the main function of the flue gas sampling and analysis system is to monitor t...

AI Technical Summary

Problems solved by technology

However, configuring more analysis unit sampling also means large investment and heavy maintenance work, which limits the application of multi-analysis unit partition sampling analysis to a certain extent

The above two sampling methods can only analyze the flue gas parameters near the end of the sampling branch, and the data representativeness is poor

Existing sampling and analysis methods include: 1) Multi-point mixed sampling and analysis method: multi-point mixed sampling and analysis method can only reflect the distribution of NOx in the sampling section, and cannot know the refined ammonia injection; 2) Multi-analysis unit sampling analysis based on denitrification partition Method: This method requires more analysis units, and faces problems such as large engineering investment and heavy equipment maintenance tasks

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