CN115358072A - 一种有机朗肯循环的新型高级㶲分析计算方法 - Google Patents
一种有机朗肯循环的新型高级㶲分析计算方法 Download PDFInfo
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Abstract
Description
技术领域
背景技术
发明内容
本发明的目的是提供一种有机朗肯循环的新型高级分析计算方法,本方法首先根据循环给定参数,基于热力学第一定律建立各部件的能量平衡方程,进行能量分析;然后基于热力学第二定律建立各部件和系统的平衡方程,进行传统分析,得到各部件和系统的损失;最后构建损失一级和二级分解量的计算模型,进行高级分析,得到各部件和系统的损失分布特性;在此基础上,确定各部件的改进优先等级和提升系统性能的最关键部件。
为达到上述目的,本发明的技术方案如下:
步骤1,进行能量分析。具体包括:
根据循环给定参数,通过MATLAB和REFPROP软件调用物性参数,计算得到各状态点的温度、压力、比焓和比熵。
基于热力学第一定律,建立各部件的能量平衡方程,计算得到各部件的换热量、作功、耗功和循环热效率。
各部件的能量平衡方程和循环热效率的计算公式如下:
蒸发器:Qeva=mORC(h3-h2)=mh(hh1-hh2)
膨胀机:Wtur=mORC(h3-h4)=mORC(h3-h4s)ηtur
冷凝器:Qcon=mORC(h4-h1)=mw(hw2-hw1)
工质泵:Wpum=mORC(h2-h1)=mORC(h2s-h1)/ηpum
循环热效率:ηORC=(Wtur-Wpum)/Qeva
式中:Q为换热量,W;W为功,W;m为质量流量,kg·s-1;h为比焓,J·kg-1;η为效率;下标ORC、eva、tur、con、pum、h、w分别为有机朗肯循环、蒸发器、膨胀机、冷凝器、工质泵、热源和冷却水。下标1-4、2s、4s 为工质状态点,h1、h2分别为热源进、出口状态点,w1、w2分别为冷却水进、出口状态点。
式中:E为焓火用,W;e为比焓火用,J·kg-1;s为比熵,J·kg-1·K-1;下标i、0分别为任意状态点和环境状态点。
蒸发器:EF,eva=mh(eh1-eh2),EP,eva=mORC(e3-e2),ED,eva=EF,eva-EP,eva
膨胀机:EF,tur=mORC(e3-e4),EP,tur=Wtur,ED,tur=EF,tur-EP,tur
冷凝器:EF,con=mORC(e4-e1),EP,con=mw(ew2-ew1),ED,con=EF,con-EP,con
工质泵:EF,pum=Wpum,EP,pum=mORC(e2-e1),ED,pum=EF,pum-EP,pum
系统:EF,sys=mh(eh1-eh2)+Wpum,EP,sys=mw(ew2-ew1)+Wt,ED,sys=EF,sys-EP,sys
式中:上标EN、EX、AV、UN分别为内部、外部、可避免和不可避免。
如权利要求1所述的一种新型的高级分析计算方法,其特征在于:步骤1所述的给定参数包括:蒸发温度、冷凝温度、蒸发器和冷凝器夹点温差、蒸发器过热度、冷凝器过冷度、膨胀机和工质泵等熵效率、工质质量流量、热源和冷源进口温度,所述的各部件包括蒸发器、膨胀机、冷凝器和工质泵。
附图说明
图1为本发明的具体流程图。
图2为有机朗肯循流程图。
具体实施方式
步骤1,进行能量分析。具体包括:
根据循环给定的蒸发温度、冷凝温度、蒸发器和冷凝器夹点温差、蒸发器过热度、冷凝器过冷度、膨胀机和工质泵等熵效率、工质质量流量、热源和冷源进口温度,通过MATLAB和REFPROP软件调用物性参数,计算得到各状态点的温度、压力、比焓和比熵。
基于热力学第一定律,建立各部件的能量平衡方程,计算得到各部件的换热量、作功、耗功和循环热效率。
各部件的能量平衡方程和循环热效率的计算公式如下:
蒸发器:Qeva=mORC(h3-h2)=mh(hh1-hh2)
膨胀机:Wtur=mORC(h3-h4)=mORC(h3-h4s)ηtur
冷凝器:Qcon=mORC(h4-h1)=mw(hw2-hw1)
工质泵:Wpum=mORC(h2-h1)=mORC(h2s-h1)/ηpum
循环热效率:ηORC=Wnet/Qeva
蒸发器:EF,eva=mh(eh1-eh2),EP,eva=mORC(e3-e2),ED,eva=EF,eva-EP,eva
膨胀机:EF,tur=mORC(e3-e4),EP,tur=Wtur,ED,tur=EF,tur-EP,tur
冷凝器:EF,con=mORC(e4-e1),EP,con=mw(ew2-ew1),ED,con=EF,con-EP,con
工质泵:EF,pum=Wpum,EP,pum=mORC(e2-e1),ED,pum=EF,pum-EP,pum
系统:EF,sys=mh(eh1-eh2)+Wpum,EP,sys=mw(ew2-ew1)+Wt,ED,sys=EF,sys-EP,sys
表1
表2为实际、不可避免和理想工况下的运行参数。
表2
表3
以上所述,仅为本发明示意性的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其改进构思加以等同替换或改变,均应涵盖在本发明的保护范围内。
Claims (7)
步骤1,进行能量分析,根据循环给定参数,通过调用物性参数,计算得到各状态点的温度、压力、比焓、比熵;基于热力学第一定律,建立各部件的能量平衡方程,计算得到各部件的换热量、作功、耗功和循环热效率;
步骤3,进行高级分析,构建其他3类工况(实际-理想工况、不可避免-实际工况、不可避免-理想工况)的计算模型,分别计算得到各部件和系统的内部损失、不可避免损失和内部不可避免损失,并根据各分量之间的关系,计算损失的其余分量,得到各部件和系统的分布特性;
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