Gas concentration data complementing method and device

Abstract

The invention provides a gas concentration data complementing method and device. The method comprises the following steps of executing the iterative operation, determining a sampling point range by taking an unmeasured sampling point of the to-be-complemented data as a center, performing spatial correlation analysis on the gas concentration data of all measured sampling points in the sampling point range, and if a spatial correlation analysis result does not meet a set requirement, reducing the sampling point range until the set requirement is met; and determining the gas concentration data ofthe unmeasured sampling points in the final sampling point range. By sampling on the section of the flowing gas, and reducing the sampling point range iteratively, all the measured sampling points inthe sampling point range meet the spatial correlation analysis, and the sampling points in the range meet the spatial correlation analysis, so that the prediction accuracy is greatly improved when data prediction is performed in the range, the supplemented data is reliable, and the method can be used for production and application.

Description

technical field [0001] The present application relates to the technical field of gas data supplementation, and more specifically, to a method and device for supplementing gas concentration data. Background technique [0002] Selective catalytic reduction (SCR) flue gas denitrification technology, as an efficient nitrogen oxide control technology, has been widely used in coal-fired power plants. The performance evaluation of the denitrification device mainly adopts two methods of field test and numerical simulation. The following problems often exist in the field test detection of NOx concentration at the denitrification inlet and outlet: (1) The cross-sectional area of ​​the flue is too large, and the sampling gun cannot penetrate into various positions of the flue; As a result, individual measuring holes cannot be tested; (3) The location distribution of measuring holes does not meet the standard requirements; (4) Since the load operation of coal-fired units is often unsta...

AI Technical Summary

Problems solved by technology

The following problems often exist in the field test detection of NOx concentration at the denitrification inlet and outlet: (1) The cross-sectional area of ​​the flue is too large, and the sampling gun cannot penetrate into various positions of the flue; As a result, individual measuring holes cannot be tested; (3) The location distribution of measuring holes does not meet the standard requirements; (4) Since the load operation of coal-fired units is often unstable, the test often cannot guarantee that all the measuring holes can be tested under the same working condition

Although the past research has done a lot of research on denitrification through SCR numerical simulation technology, it is still not fully mature: (1) mainly set the boundary conditions of the SCR reactor inlet (such as inlet NOx concentration, flue gas flow rate, temperature, etc.) However, the flow field at the reactor inlet is often not uniform; (2) the simulation starts from the flue at the boiler end, in order to describe the flow field distribution of the denitrification inlet as accurately as possible, but the inlet at the boiler end still adopts Uniformly distributed boundary conditions

The above reasons make it impossible to conduct distribution detection and deviation evaluation of the NOx concentration at the denitrification inlet and outlet under the same working conditions

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