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为有效地回收低品位余热 ,该文以水 /溴化锂(H2 O/ L i Br)工质对为例 ,分析了 3种二次提升型吸收式变热器 ,指出其中第一级吸收器和第二级蒸发器相连接的形式(A1- E2型 )是最可取的。并着重分析了 A 1- E2型二次提升型吸收式变热器的热力性能 ,结果表明 ,二次提升型吸收式变热器比单级吸收式变热器有更高的温度提升 ,运行范围扩大 ,但系统性能有所下降。根据对不同工质对的热力分析 ,该文还提出了第一级采用 H2 O/ L i Br,第二级采用三氟乙醇 / N -甲基 - 2 -吡咯烷酮 (TFE/ NMP)为工质对的二次提升型吸收式变热器的设想 ,它既能获得较高的温度提升又有相对较高的性能系数。
In order to effectively recover the waste heat of low grade, three kinds of secondary lifting absorption heat exchangers were analyzed in this paper, using the working pair of water / lithium bromide (LiBr / LiBr) as an example, The second stage evaporator connected to the form (A1 - E2 type) is the most desirable. The thermal performance of the A 1-E2 type secondary lifting absorption heat exchanger is analyzed emphatically. The results show that the secondary lifting type absorption heat exchanger has a higher temperature rise and operation than the single-stage absorption heat exchanger The scope of the expansion, but the system performance declined. Based on the thermodynamic analysis of different working pairs, the paper also proposed the first stage using H2 O / L i Br and the second stage using trifluoroethanol / TMP / NMP as working medium The idea of a second-lift absorption heat exchanger is to obtain both a higher temperature increase and a relatively higher coefficient of performance.