CAJ | 학술논문

随着能源价格的不断提升，化工企业的节能降耗成为紧迫必行的任务。通过在对一实际过程的换热网络结构分析的基础上提取热、冷工艺物流，在给定的最小传热温差（20℃）限制下运用夹点设计法合成具有最大热回收的新换热网络；采用断开热负荷回路、取消热负荷较小的换热器达到减少换热器个数、简化网络的目的；由于热负荷转移造成了某些换热器传热温差违反最小传热温差限制、甚至出现传热温差为负值（违反热力学第二定律）的情况，采用能量松弛法恢复这些换热器的传热温差至给定的最小传热温差。经过调优后换热器网络总换热设备个数与原实际网络的相同，但与原实际网络相比，热、冷公用工程均节省1220 kW。
수착능원개격적불단제승，화공기업적절능강모성위긴박필행적임무。통과재대일실제과정적환열망락결구분석적기출상제취열、랭공예물류，재급정적최소전열온차（20℃）한제하운용협점설계법합성구유최대열회수적신환열망락；채용단개열부하회로、취소열부하교소적환열기체도감소환열기개수、간화망락적목적；유우열부하전이조성료모사환열기전열온차위반최소전열온차한제、심지출현전열온차위부치（위반열역학제이정률）적정황，채용능량송이법회복저사환열기적전열온차지급정적최소전열온차。경과조우후환열기망락총환열설비개수여원실제망락적상동，단여원실제망락상비，열、랭공용공정균절성1220 kW。
With energy prices rising , energy saving for chemical enterprises becomes the urgent task .A new ini-tial heat exchanger network ( HEN) with maximum heat recovery under restriction of given minimum temperature difference (20℃) was synthesized by applying pinch design method via abstracting process streams based on a -nalysis of the structure of an existing HEN .The new initial HEN was simplified by lessen the number of heat ex-changers through breaking heat loops and cancelling some heat exchangers with small heat duty .Heat transfer temperature difference of some heater exchangers became less than the given minimum approach temperature difference and even negative heat transfer temperature difference occurred ( violating the second thermodynamic law) due to heat load transfer .So energy relaxation method was used to restore the heat transfer temperature difference to the given minimum approach temperature difference (20℃).The number of heat exchangers of the new HEN after evolution was identical as the original one while the hot and cold utilities of the new HEN were both 1 220 kW less than those of the original one .