Acta Metrologica Sinica  2019, Vol. 40 Issue (4): 603-609    DOI: 10.3969/j.issn.1000-1158.2019.04.10
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Analysis and Simulation of Coal Sampling Uncertainty in Coal-fired Utility Boiler
LIU Fu-guo,CUI Fu-xing
State Grid Shandong Electric Power Research Institute, Jinan, Shandong 250003, China
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Abstract  Aiming at quantitative analysis of uncertainty of coal heat value in process of coal sample collection, actual sampling experiments are carried out in 17 boilers of 6 power plants. Uniformity of coal quality being expressed by variance of concentration, coal sampling random model revised by experiments is established to analyze effects of uniformity of coal quality on uncertainty of coal heat value, on basis of this, the dispersive characteristics of the weighted average calorific value of coal are investigated, and it shows that (1) Uncertainty of coal heat value caused by coal sampling process in different boilers are ranged from 1 ~ 4.82MJ/kg, (2) The worse of coal mixed uniformity, the greater of coal heat value uncertainty in coal sampling process, (3) Coal calorific value uncertainty can be significantly reduced by the weighted average calorific value of coal.
Key wordsmetrology      coal sample as fired      coal heat value      uncertainty analysis     
Received: 16 April 2018      Published: 10 June 2019
PACS:  TB941  
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LIU Fu-guo
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LIU Fu-guo,CUI Fu-xing. Analysis and Simulation of Coal Sampling Uncertainty in Coal-fired Utility Boiler[J]. Acta Metrologica Sinica, 2019, 40(4): 603-609.
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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2019.04.10     OR     http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2019/V40/I4/603
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