超临界CO2布雷顿循环余热回收系统性能分析与优化
余廷芳,宋凌

Performance analysis and optimization of supercritical CO2 Brayton cycle waste heat recovery system
Ting-fang YU,Ling SONG
表 1 SCBC/KC系统各部件能量守恒及㶲守恒方程
Tab.1 Energy and exergy balance expressions for each component in SCBC/KC system
部件 能量守恒方程 㶲守恒方程
吸热器 ${\varPhi_{ {\text{ER} } } } = {q_{m,{\text{s} } } }({h_{\text{5} } } - {h_{\text{4} } })$ ${E_{\text{4} } }+{E_{{\text{q, ER} } } } = {E_{\text{5} } }+{E_{ {\text{d,ER} } } }$
透平 ${P_{\text{T} } } = {q_{m,{\text{s} } } }({h_{\text{5} } } - {h_{\text{6} } })$ ${E_{\text{5} } } = {E_{\text{6} } }+{P_{\text{T} } }+{E_{ {\text{d,T} } } }$
主压缩机 ${P_{ {\text{MC} } } } = ({q_{m,{\text{s} } } } - {q_{m,{\text{r} } } })({h_{\text{2} } } - {h_{\text{1} } })$ ${E_{\text{1} } }+{P_{ {\text{MC} } } } = {E_{\text{2} } }+{E_{ {\text{d,MC} } } }$
再压缩机 ${P_{ {\text{RC} } } } = {q_{m,{\text{r} } } }({h_{\text{3} } } - {h_{\text{8} } })$ ${E_{\text{8} } }+{P_{ {\text{RC} } } } = {E_{\text{3} } }+{E_{ {\text{d,RC} } } }$
高温回热器 $ {q_{m,{\text{s}}}}({h_{\text{6}}} - {h_{\text{7}}}) = {q_{m,{\text{s}}}}({h_{\text{4}}} - {h_{\text{3}}}) $ $ {E_{\text{6}}}+{E_{\text{3}}} = {E_{\text{7}}}+{E_{\text{4}}}+{E_{{\text{d,HTR}}}} $
低温回热器 $ {q_{m,{\text{s}}}}({h_{\text{7}}} - {h_{\text{8}}}) = ({q_{m,{\text{s}}}} - {q_{m,{\text{r}}}})({h_{\text{3}}} - {h_{\text{2}}}) $ $ {E_{\text{7}}}+{E_{\text{2}}} = {E_{\text{8}}}+{E_{\text{3}}}+{E_{{\text{d,LTR}}}} $
蒸发器 $ ({q_{m,{\text{s}}}} - {q_{m,{\text{r}}}})({h_{\text{8}}} - {h_{\text{9}}}) = {q_{m,{\text{v}}}}{h_{{\text{01}}}}+{q_{m,{\text{l}}}}{h_{{\text{03}}}} - {q_{m,{\text{k}}}}{h_{{\text{08}}}} $ $ {E_{\text{8}}}+{E_{{\text{08}}}} = {E_{\text{9}}}+{E_{{\text{01}}}}+{E_{{\text{03}}}}+{E_{{\text{d,GK}}}} $
涡轮机 ${P_{ {\text{TK} } } } = {q_{m,{\text{k} } } }({h_{ {\text{01} } } } - {h_{ {\text{02} } } })$ ${E_{ {\text{01} } } } = {E_{ {\text{02} } } }+{P_{ {\text{TK} } } }+{E_{ {\text{d,TK} } } }$
预热器 $ {q_{m,{\text{l}}}}({h_{{\text{03}}}} - {h_{{\text{04}}}}) = {q_{m,{\text{k}}}}({h_{{\text{08}}}} - {h_{{\text{07}}}}) $ $ {E_{{\text{03}}}}+{E_{{\text{07}}}} = {E_{{\text{08}}}}+{E_{{\text{04}}}}+{E_{{\text{d,PHK}}}} $
节流阀 $ {q_{m,{\text{l}}}}{h_{{\text{04v}}}} = {q_{m,{\text{l}}}}{h_{{\text{04a}}}} $ $ {E_{{\text{04}}}} = {E_{{\text{04v}}}}+{E_{{\text{d,VK}}}} $
混合器 $ {q_{m,{\text{v}}}}{h_{{\text{02}}}}+{q_{m,{\text{l}}}}{h_{{\text{04v}}}} = {q_{m,{\text{k}}}}{h_{{\text{05}}}} $ $ {E_{{\text{02}}}}+{E_{{\text{04v}}}} = {E_{{\text{05}}}}+{E_{{\text{d,MK}}}} $
次冷却器 ${\varPhi_{ {\text{CK} } } } = {q_{m,{\text{k} } } }({h_{ {\text{05} } } } - {h_{ {\text{06} } } })$ ${E_{ {\text{05} } } } = {E_{ {\text{06} } } }+{E_{ {\text{q,CK} } } }+{E_{ {\text{d,CK} } } }$
${P_{ {\text{PK} } } } = {q_{m,{\text{k} } } }({h_{ {\text{07} } } } - {h_{ {\text{06} } } })$ ${E_{ {\text{06} } } }+{P_{ {\text{PK} } } } = {E_{ {\text{07} } } }+{E_{ {\text{d,PK} } } }$
主冷却器 ${\varPhi_{ {\text{CS} } } } = ({q_{m,{\text{s} } } } - {q_{m,{\text{r} } } })({h_{\text{9} } } - {h_{\text{1} } })$ ${E_{\text{9} } } = {E_{\text{1} } }+{E_{ {\text{q,CS} } } }+{E_{ {\text{d,CS} } } }$