双氧法测量烟气再循环率及不确定度分析

doi:10.3969/j.issn.1000-1158.2022.09.18

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Abstract A formula for calculating the flue gas recirculation rate is derived based on a chemical reaction balance equation with constant gas components and concentrations. A dual oxygen method for measuring flue gas oxygen concentration and flue gas-air mixture oxygen concentration in gas boilers is proposed. In order to quantify the quality of the measurement results, the uncertainty of the dioxygen method is assessed based on the GUM method in national standards, and instrument selection guidance is presented based on uncertainty requirements. It is found that when the flue gas oxygen concentration measurement result is 1.91% and the mixed gas oxygen concentration measurement result is 18.64%, the flue gas recirculation rate R calculated by the dual oxygen method is 13.45% with an extended uncertainty of 1.56%. The uncertainty of the mixed gas oxygen concentration measurement has a significant impact on the extended uncertainty of the dioxygen method. When measurement instrument is selected, the extended uncertainty of a mixed gas oxygen concentration measurement instrument can be less than the extended uncertainty of the flue gas oxygen concentration measurement instrument.

Key words： metrology flue gas recirculation rate dual oxygen method gas boiler uncertainty analysis

Received: 17 August 2020 Published: 19 September 2022

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TB99

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	Articles by authors
	ZENG Ji-peng
	PAN Deng
	GUAN Jian
	YU Ji-ming
	GAO Nai-ping
	ZHU Tong

Cite this article:

ZENG Ji-peng,PAN Deng,GUAN Jian, et al. Measurement Method of Flue Gas Recirculation Rate and Uncertainty Analysis[J]. Acta Metrologica Sinica, 2022, 43(9): 1220-1225.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.09.18 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I9/1220

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