0 前言
1 生物质废弃物燃烧过程中结焦及腐蚀的形成机理
1.1 生物质废弃物燃烧过程中结焦形成机理
1.2 生物质燃烧过程中腐蚀的形成机理
2 灰分组成与结焦、积灰和腐蚀形成的关联关系
Index | Formulation | Predictive criterion |
---|---|---|
Base-to-acid oxides, RB/A | ${{R}_{\text{B/A}}}=\frac{\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}+\text{CaO}+\text{MgO}+{{\text{K}}_{\text{2}}}\text{O}+\text{N}{{\text{a}}_{\text{2}}}\text{O}}{\text{Si}{{\text{O}}_{2}}+\text{Ti}{{\text{O}}_{2}}+\text{A}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}}$ | ${{R}_{\text{B/A}}}$< 0.5 low slagging inclination; 0.5 <${{R}_{\text{B/A}}}$< 1 medium slagging inclination; 1 <${{R}_{\text{B/A}}}$< 1.75 high slagging inclination; ${{R}_{\text{B/A}}}$> 1.75 severe slagging inclination |
${{R}_{\text{B/A}}}=\frac{\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}+\text{CaO}+\text{MgO}}{\text{Si}{{\text{O}}_{\text{2}}}+\text{A}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{3}}}}$ | ||
${{R}_{\text{B/A}}}=\frac{\text{F}{{\text{e}}_{\text{2}}}{{\text{O}}_{\text{3}}}+\text{CaO}+\text{MgO}+{{\text{K}}_{\text{2}}}\text{O}+\text{N}{{\text{a}}_{\text{2}}}\text{O}+{{\text{P}}_{\text{2}}}{{\text{O}}_{\text{5}}}}{\text{Si}{{\text{O}}_{\text{2}}}+\text{Ti}{{\text{O}}_{2}}+\text{A}{{\text{l}}_{\text{2}}}{{\text{O}}_{3}}}$ | ||
Sulfur based index, Rs | ${{R}_{\text{s}}}={{R}_{\text{B/A}}}\times {{\text{S}}^{\text{d}}}$ | |
Fouling index, Fu | ${{F}_{\text{u}}}={{R}_{\text{B/A}}}\times \left( {{\text{K}}_{\text{2}}}\text{O}+\text{N}{{\text{a}}_{\text{2}}}\text{O} \right)$ | Fu < 0.6, low fouling inclination; 0.6< Fu < 40, high fouling inclination |
Alkali index, AI | $\text{AI}=\frac{\left( {{\text{K}}_{\text{2}}}\text{O}+\text{N}{{\text{a}}_{\text{2}}}\text{O} \right)\times {{A}^{\gamma }}}{\text{HHV}}$ | AI < 0.17 kg/GJ low severity fouling; AI > 0.34 kg/GJ high severity fouling |
S/Cl atomic ratio | $\frac{\text{S}}{\text{Cl}}$ | S/Cl < 2 high risk corrosion; S/Cl ≥ 4 low risk corrosion; S/Cl < 6.7 increase deposition rate |