Relationships Proximate Analysis Results and Higher Heating Values of Lignites

Abstract

In this study, the higher heating values (HHVs) of 26 lignite samples were calculated by using the proximate and elemental analyses data. The proximate analysis results such as volatile materials (VM), fixed carbon (FC) and HHV and the elemental analysis results such as carbon (C), hydrogen (H), oxygen (O), nitrogen (N) and sulfur (S) were determined for 26 lignite samples from different areas of Turkey. The lignite samples have been tested with particle size of 0-0.05 mm. The HHVs of 26 lignite samples obtained from different Turkish sources were determined experimentally and calculated from both ultimate and proximate analyses. HHVs of 26 the lignite samples can be calculated from the Equation based modeling. The HHVs (MJ/kg) of the lignite samples as a function of fixed carbon (FC, wt%) or volatile materials (VM, %) was calculated from the following equations: HH V D 0:300F C C 11:117 (1) HH V D 0:323VM C 42:223 (2) where the correlation coefficients for Eqs. (1) and (2) were 0.9907 and 0.9862, respectively. The combustion heats calculated from Eqs. (1) and (2) showed mean differences of C3.9% and C0.3%, respectively. The HHVs (MJ/kg) of the lignite samples as a function of C, H, O, N, and S were calculated from the following equation:where the correlation coefficients for Eq. (3) was 0.9891. HHVs calculated from Eq.(3) showed a mean deviation of C0.1.

Relationship between random reflectance of ulminite B/collotelinite and technological parameters of Polish low-rank coal

“…Similarly high correlations between random reflectance and the aforementioned parameters in low-rank coal have been demonstrated by Küçükbayraka et al [28], Demirbas [29], and Chehreh Chelgania et al [30], where the value of the correlation coefficient between random reflectance and gross calorific value recalculated to ash-free basis varies from 0.91 to 0.96, while for C daf it reaches 0.93.…”

Oxygen consumption as the definitive factor in predicting heat of combustion

“…where the constants have been determined for 1087 fuel data points [27][28][29][30][31][32][33][34][35][36][37]. Equation 10is in principle a modifier function and substituted into Equation 9 (Fig.…”

Relationships Between Specific Gravities and Higher Heating Values of Petroleum Components

“…The experimental determination of combustion heats and elemental analyses requires special instrumentation such as calorimeter and elemental analyzer, whereas proximate analysis data can be obtained relatively easily using common laboratory equipment (Demirbas, 2008a(Demirbas, , 2008b(Demirbas, , 2008c(Demirbas, , 2009b(Demirbas, , 2009c.…”