Smoke oxygen content measurement method and system

Abstract

The invention provides a smoke oxygen content measurement method and system. The system comprises a main flue, an air preheater, a dust collector, a bypass flue and an oxygen content measurement device, wherein the air preheater is arranged in the main flue; the dust collector is used for collecting smoke to be tested from the main flue at the front end of the air preheater and carrying out dust removal treatment on the smoke to be tested; the bypass flue is used for sending the smoke to be tested, subjected to the dust removal treatment by the dust collector, to the main flue at the rear endof the air preheater; and the oxygen content measurement device is used for detecting the oxygen content of the smoke to be tested in the bypass flue and outputting detected oxygen content data. Based on the technical scheme of the invention, a zirconium oxide probe can be prevented from being contaminated by dust, and the smoke oxygen content can be accurately measured.

Description

technical field [0001] The invention relates to flue gas treatment technology, in particular to a method and system for measuring the oxygen content of flue gas during the flue gas treatment process. Background technique [0002] At present, zirconia probes are often used to measure the oxygen content in flue gas. As an oxygen content measurement element, zirconia probes have rapid response and low maintenance. Such as figure 1 As shown, the flue gas produced in the furnace of the boiler 101, after passing through the tail flue 102, enters the air preheater 104 through the air preheater inlet flue 103, and after the air preheater outlet flue 105, passes through the ash remover 106 in turn , the suction fan 108 and the chimney 108 enter the atmosphere, and the flue through which the flue gas passes is the main flue. The zirconia probe 109 is inserted into the flue gas from the side wall of the main flue at the inlet flue 103 of the air preheater to measure the oxygen conten...

AI Technical Summary

Problems solved by technology

The zirconia probe has high requirements for measurement. The zirconia probe is easily affected by the dust in the flue gas and affects the accuracy; at the same time, the zirconia probe must be placed in the main flue gas flow to accurately measure the oxygen content. However, the length of the zirconia probe is about 1m, and the width of the main flue is more than ten meters, so it is difficult to arrange the zirconia probe in the main flue gas flow or the full-load main steam flow. poor accuracy

[0003] Moreover, the flue flow area of ​​modern large-capacity boilers is large and often turns, so the velocity in the flue flow area is uneven, and there may be eddy currents in some areas, which affects the measurement of oxygen content in the flue gas

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