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Table 5 The calculation formula of energy parameter

From: Improvement of corn stover fuel properties via hydrothermal carbonization combined with surfactant

Term

Equation

Solid recovery (%)

\( \frac{{{\text{Mass}}\;{\text{of}}\;{\text{dried}}\;{\text{solid}}\;{\text{product}}}}{{{\text{Mass}}\;{\text{of}}\;{\text{dried}}\;{\text{initial CS}}}}\;*\;100 \)

Carbon recovery efficiency (%)

\( \frac{{{\text{carbon }}\;\left( {\text{\% }} \right)\;{\text{in}}\;{\text{solid}}\;{\text{product}}\;*\;{\text{solid}}\;{\text{product}}\;{\text{weight}}}}{{{\text{carbon}}\;\left( {\text{\% }} \right)\;{\text{in}}\;{\text{CS}}\;*\;{\text{CS}}\;{\text{weight}}}}\;*\;100 \)

Fixed carbon recovery efficiency (%)

\( \frac{{{\text{Fixed}}\;{\text{carbon}}\;\left( {\text{\% }} \right) \;{\text{in}}\;{\text{solid product}}\;*\;{\text{solid}}\;{\text{product}}\;{\text{weight}}}}{{{\text{Fixed}}\;{\text{carbon}}\;\left( \% \right) \;{\text{in}}\;{\text{CS}}\;*\;{\text{CS}}\;{\text{weight}}}}\;*\;100 \)

Energy densification efficiency (%)

\( \frac{{{\text{calorific}}\;{\text{value}}\;{\text{of}}\;{\text{solid}}\;{\text{product}}}}{{{\text{calorific}}\;{\text{value}}\;{\text{of}}\;{\text{CS}}}}*100 \)

Energetic retention efficiency (%)

\( \frac{{{\text{calorific}}\;{\text{value}}\;{\text{of}}\;{\text{solid}}\;{\text{product}}}}{{{\text{calorific}}\;{\text{value}}\;{\text{of}}\;{\text{CS}}}}\;*\;{\text{Solid}}\;{\text{recovery}} \)

HHV improvement (%)

\( \frac{{{\text{HHV}}\;{\text{of}}\;{\text{solid}}\;{\text{product}} - {\text{HHV}}\;{\text{of}}\;{\text{CS}}}}{{{\text{HHV}}\;{\text{of}}\;{\text{CS}}}}\;\;*\;\;100 \)