化工进展
化工進展
화공진전
CHEMICAL INDUSTRY AND ENGINEERING PROGRESS
2014年
1期
30-35
,共6页
机械蒸汽再压缩%Aspen Plus模拟%性能分析
機械蒸汽再壓縮%Aspen Plus模擬%性能分析
궤계증기재압축%Aspen Plus모의%성능분석
mechanical vapor recompression (MVR)%Aspen Plus simulation%performance analysis
机械蒸汽再压缩（MVR）蒸发系统是一种新型高效节能蒸发技术。它有多个单元设备组成，每个操作节点的控制都对系统运行的稳定性和节能效率至关重要，其中包括进料温度、蒸发压强、蒸汽压缩比、冷凝液温度等。若操作条件不当，不仅会大大降低蒸发效率而且会对设备和管路造成损害。本文建立了一套充分利用能源的MVR蒸发工艺流程，并通过理论分析对每个操作节点进行了质量和能量衡算，同时利用Aspen Plus模拟软件建立了系统的流程模拟图。通过对操作单元的变量控制，研究了循环蒸汽量、补充水的量与进料温度、冷凝液温度、蒸汽压缩比以及蒸发压强等之间的变化关系。由数据分析可得：原料在饱和液体时进料最佳，冷凝液的温度应保持与蒸发温度的有效温差在5～8℃时较好，压缩机的蒸汽压缩比控制在1.8～2.2较为合理。同时可利用冷凝液和浓缩液的余热对原料预热，补充水也可从冷凝液中直接取用。
機械蒸汽再壓縮（MVR）蒸髮繫統是一種新型高效節能蒸髮技術。它有多箇單元設備組成，每箇操作節點的控製都對繫統運行的穩定性和節能效率至關重要，其中包括進料溫度、蒸髮壓彊、蒸汽壓縮比、冷凝液溫度等。若操作條件不噹，不僅會大大降低蒸髮效率而且會對設備和管路造成損害。本文建立瞭一套充分利用能源的MVR蒸髮工藝流程，併通過理論分析對每箇操作節點進行瞭質量和能量衡算，同時利用Aspen Plus模擬軟件建立瞭繫統的流程模擬圖。通過對操作單元的變量控製，研究瞭循環蒸汽量、補充水的量與進料溫度、冷凝液溫度、蒸汽壓縮比以及蒸髮壓彊等之間的變化關繫。由數據分析可得：原料在飽和液體時進料最佳，冷凝液的溫度應保持與蒸髮溫度的有效溫差在5～8℃時較好，壓縮機的蒸汽壓縮比控製在1.8～2.2較為閤理。同時可利用冷凝液和濃縮液的餘熱對原料預熱，補充水也可從冷凝液中直接取用。
궤계증기재압축（MVR）증발계통시일충신형고효절능증발기술。타유다개단원설비조성，매개조작절점적공제도대계통운행적은정성화절능효솔지관중요，기중포괄진료온도、증발압강、증기압축비、냉응액온도등。약조작조건불당，불부회대대강저증발효솔이차회대설비화관로조성손해。본문건립료일투충분이용능원적MVR증발공예류정，병통과이론분석대매개조작절점진행료질량화능량형산，동시이용Aspen Plus모의연건건립료계통적류정모의도。통과대조작단원적변량공제，연구료순배증기량、보충수적량여진료온도、냉응액온도、증기압축비이급증발압강등지간적변화관계。유수거분석가득：원료재포화액체시진료최가，냉응액적온도응보지여증발온도적유효온차재5～8℃시교호，압축궤적증기압축비공제재1.8～2.2교위합리。동시가이용냉응액화농축액적여열대원료예열，보충수야가종냉응액중직접취용。
Mechanical vapor recompression (MVR) evaporation system is a new energy efficient evaporation technology. It has several unit devices,the system stability and energy efficiency depend on each node control,such as feed temperature,evaporation pressure,the ratio of vapor compression and condensation temperature. If the operational conditions are not appropriate,the evaporation efficiency will be reduced,and the equipment and piping will be damaged. This paper established a MVR evaporation process flow that can fully use energy. Quality and energy of each operation node were calculated,and a system of simulation process was establish using the Aspen Plus software. This research investigated the mass flow of cyclic steam and the mass flow of added water under different feed temperatures , condensation temperatures , the ratio of vapor compression and evaporation pressure,by analyzing controlling unit operations. The results showed that raw materials reached the optimal conditions in saturated liquids,temperature of the condensate to the evaporation temperature at 5-8℃ was most effective for the system,and the vapor compression ratio of compressor in the 1.8-2.2 was more reasonable. The heat from condensate and the concentrate can be used to preheat the raw material,and the added water can be drawn directly from the condensate.
