化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
10期
2557-2564
,共8页
隔离壁精馏塔%蒸馏%塔器%黑洞%进料热状况%四点控制%优化设计
隔離壁精餾塔%蒸餾%塔器%黑洞%進料熱狀況%四點控製%優化設計
격리벽정류탑%증류%탑기%흑동%진료열상황%사점공제%우화설계
dividing-wall distillation column%distillation%column%black-hole problem%feed thermal condition%four-point composition control%optimization
隔离壁精馏塔在同时控制4个质量指标（塔顶、侧线、塔底产品浓度以及侧线采出杂质比）时会产生设计与操作黑洞，黑洞的产生对隔离壁精馏塔的应用范围带来很大的限制。本文提出了一种通过调整进料和侧线采出的热状况对隔离壁精馏塔的黑洞进行填补的策略。这两个操作变量通过对全塔热平衡的影响，改善预分离塔与主塔之间的耦合关系，进而改善两者分离能力并最终消除黑洞，同时改善了隔离壁精馏塔的动态特性。针对进出料热状况的调整，本文结合牛顿法给出了简单的调整规则，调整会形成3种不同的方案，为不同能量供应条件下填补隔离壁精馏塔的黑洞提供了可能。通过使用 Aspen Plus 模拟理想三元物系分离，对黑洞填补方法进行稳态分析和动态响应验证，证明采用调整进出料热状况的方法可以有效的填补隔离壁精馏塔的设计与操作黑洞并使其动态特性得到改善。本文所提出的方法完善了填补黑洞的方法体系，增加了隔离壁精馏塔的灵活性与适应性。
隔離壁精餾塔在同時控製4箇質量指標（塔頂、側線、塔底產品濃度以及側線採齣雜質比）時會產生設計與操作黑洞，黑洞的產生對隔離壁精餾塔的應用範圍帶來很大的限製。本文提齣瞭一種通過調整進料和側線採齣的熱狀況對隔離壁精餾塔的黑洞進行填補的策略。這兩箇操作變量通過對全塔熱平衡的影響，改善預分離塔與主塔之間的耦閤關繫，進而改善兩者分離能力併最終消除黑洞，同時改善瞭隔離壁精餾塔的動態特性。針對進齣料熱狀況的調整，本文結閤牛頓法給齣瞭簡單的調整規則，調整會形成3種不同的方案，為不同能量供應條件下填補隔離壁精餾塔的黑洞提供瞭可能。通過使用 Aspen Plus 模擬理想三元物繫分離，對黑洞填補方法進行穩態分析和動態響應驗證，證明採用調整進齣料熱狀況的方法可以有效的填補隔離壁精餾塔的設計與操作黑洞併使其動態特性得到改善。本文所提齣的方法完善瞭填補黑洞的方法體繫，增加瞭隔離壁精餾塔的靈活性與適應性。
격리벽정류탑재동시공제4개질량지표（탑정、측선、탑저산품농도이급측선채출잡질비）시회산생설계여조작흑동，흑동적산생대격리벽정류탑적응용범위대래흔대적한제。본문제출료일충통과조정진료화측선채출적열상황대격리벽정류탑적흑동진행전보적책략。저량개조작변량통과대전탑열평형적영향，개선예분리탑여주탑지간적우합관계，진이개선량자분리능력병최종소제흑동，동시개선료격리벽정류탑적동태특성。침대진출료열상황적조정，본문결합우돈법급출료간단적조정규칙，조정회형성3충불동적방안，위불동능량공응조건하전보격리벽정류탑적흑동제공료가능。통과사용 Aspen Plus 모의이상삼원물계분리，대흑동전보방법진행은태분석화동태향응험증，증명채용조정진출료열상황적방법가이유효적전보격리벽정류탑적설계여조작흑동병사기동태특성득도개선。본문소제출적방법완선료전보흑동적방법체계，증가료격리벽정류탑적령활성여괄응성。
While four-point control strategy (i.e.,the main compositions of the three products and the ratio between the two impurities in the intermediate product are controlled simultaneously) is used for the dividing-wall distillation column (DWDC),the black-hole problem occurs and limits process flexibility and operability. In this paper,a philosophy was proposed to eliminate the black-hole problem with careful adjustment of the thermal conditions of feed and intermediate product. Through strong influence on the overall energy balance of the DWDC,these two variables affected the interlinking flows between prefractionator and main distillation column involved and could thus serve to coordinate their relationship. The dynamic responses were also improved after elimination of the black-hole problem. A simple rule was proposed to adjust the thermal conditions and three possible configurations could be obtained. The separation of a hypothetical ternary mixture,A,B,and C simulated with Aspen Plus,was chosen to evaluate the feasibility and effectiveness of the proposed philosophy. After steady-state analysis and closed-loop control studies,the results demonstrated that the black-hole problem could be completely removed through careful adjustment of the thermal conditions of feed and intermediate product. This philosophy brought the method of eliminating the black-hole problem to completion and enhanced the flexibility and operability of the DWDC.
