Orthogonal experiment design and range analysis of TPCT extracting thermal energy from coal fire

doi:10.16265/j.cnki.issn1003-3033.2021.09.019

Abstract

Abstract: In order to investigate influence of three main factors, such as concentration of CuO working medium, insertion depth and inclination angle, on the extraction performance of coal thermal energy. Three levels were selected to form L9 orthogonal test, extraction test of coal thermal energy by TPCT was carried out when temperature of coal body was 100 ℃. According to range analysis of test results, it can be concluded that under test conditions, order of influencing factors affecting extraction of TPCT coal thermal energy is inclination > concentration of nano-CuO working fluid> insertion depth. The optimal scheme is determined with mass fraction of nano-CuO as 5%, insertion depth as 40 cm and inclination angle as 90°. According to repeatability test of this scheme, it is found that the maximum cooling rate under this scheme is 38.62%, which is better than results of 9 groups of orthogonal tests. Based on above tests and analysis, the optimal factor level of TPCT in the extraction of coal fire heat energy is determined, and the optimal extraction effect is obtained under factor level.

Key words: two-phase closed thermosyphon (TPCT), coal fire, thermal extraction, orthogonal experiment, range analysis

CLC Number:

X932
TD75

ZHONG Kaiqi, XIAO Yang, LU Xing,DENG Jun. Orthogonal experiment design and range analysis of TPCT extracting thermal energy from coal fire[J]. China Safety Science Journal, 2021, 31(9): 135-141.

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