Representative measuring point feature parameter determining method for smoke gas ingredient concentration whole cross section measurement

Abstract

The invention discloses a representative measuring point feature parameter determining method for smoke gas ingredient concentration whole cross section measurement. The method comprises the followingsteps of 1, using a smoke gas ingredient measuring instrument for measuring the discrete distribution features in the whole cross section of a flue to be tested of the smoke gas ingredient concentration in the cross section of the flue to be tested under the fixed load work conditions on the basis of a discrete grid point distribution mode; 2, drawing a whole-cross-section ingredient concentration distribution cloud drawing by combining with a linear interpolation theory; realizing the pseudo continuous precise measurement of the ingredient concentration of the smoke gas to be tested; 3, determining the transverse arrangement feature parameter of the representative measuring point, including the arrangement number n of the representative measuring point and the transverse interval x of the adjacent representative measuring point; 4, determining the longitudinal arrangement feature parameter of the representative measuring point, i.e., the arrangement depth hi of the representative measuring point i, wherein the i is greater than or equal to 0 but smaller than equal to n.

Description

technical field [0001] The invention relates to the technical field of flue gas component concentration measurement at the tail of a boiler, in particular to a method for determining characteristic parameters of representative measurement points for full-section measurement of flue gas component concentration. Background technique [0002] The flue gas produced by boiler combustion contains many gas components, such as nitrogen oxides (NO x ), sulfur oxides (SO x ), water (H 2 O), ammonia (NH 3 ), carbon monoxide (CO), and carbon dioxide (CO 2 ), etc., realizing the accurate measurement of the concentration of the above-mentioned components is of great significance for the organization of combustion adjustment feedback and the removal of gas pollutants. Existence directly leads to poor measurement accuracy. [0003] Nitrogen oxides (NOx) involved in the technical field of selective catalytic reduction (SCR) flue gas denitrification x ) concentration measurement as an e...

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Problems solved by technology

However, practice has shown that the NO in the inlet and outlet flue section of the SCR system x The concentration distribution is extremely uneven, the inlet cross-section is about 15m×4m, and the outlet cross-section is about 15m×6m (taking a 660MW unit as an example). The reliability of the measured value is always a question

In this regard, in recent years, the technical means of multi-point sampling / in-situ measurement has appeared in the industry. Even though it alleviates the sampling shortage of single-point measurement to a certain extent, most of the technical means adopt the processing measures of uniform distribution of measuring points. The number of layout points is about 3, without considering the real distribution characteristics of gas components in the entire cross-section, there is a large room for optimization in the layout design of such technical measuring points

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