【作者】 金鑫；

【导师】 钱宇；

【作者基本信息】 华南理工大学 ， 化学工程， 2013， 硕士

【摘要】 煤为原料的能源化工联产过程是煤资源高效利用的一个重要方向。由于能源和化工领域人们关注的问题不一样，往往造成对联产过程的设计上的差异：动力工程研究集中于提高热工效率，优化联产过程中的能量集成；而化学工程重点关注原料转化为化工产品的转化率问题，采取未反应物再循环、回流等方式优化联产过程中的物料集成。以煤联产化学品和电力系统为例，生产化学品和发电需要消耗不同品位的蒸汽，同时利用生产过程中的显热也会得到不同品位的蒸汽。对于不考虑以外部锅炉补充能量的系统而言，各品位蒸汽的供求量一般来说都是不相等的，如何平衡不同品位蒸汽的不足和盈余是这类系统集成设计的关键因素之一。同时，在煤基联产系统中，煤气化得到的合成气进入化学品合成单元和发电单元的比例也影响着整个系统的热力学效率。一方面，合成气的分配比例直接决定系统产出的化工品和电力比例；另一方面，合成气的分配比例也间接影响着化学品合成单元的能量需求和发电单元的烟气流量，进而影响到换热网络、蒸汽网络的设计。另外，在化学品合成单元，合成气通过反应器后的产物中包含大量的未反应气，这股未反应气的循环量是系统集成设计的另一个重要参数。增加未反应气的循环量会增加化学品的产出，但同时也会带来能耗的增加和电力产出的减少；减少未反应气的循环量会增加电力产出，但同时也会减少化学品的产量。为解决上述问题，本文以节约率为评价指标，同时考虑物料集成和能量集成两个方面，对煤联产甲醇和电力系统进行了建模模拟和设计与开发。结果表明，设计后的联产系统相对节能率可比单产系统提高7.8%。更多还原

【Abstract】 Coal based polygeneration processes is an important aspect for efficient use of coal. Inrecent years, there have been a large number of studies for the polygeneration process, but asthe different background of researchers, the main emphasis is different: studies in energyengineering pay more attention on improving energy efficiency, while those in chemicalengineering focus more on increasing resource efficiency.Different grades of steam have been generated and cost in a coal based polygenerationprocess. Usually the supply and demand for a specific grade of steam can’t be fitted perfectlyand how to balance the unbalanced is a key factor to a polygeneration process. Also, theamount of syngas into chemical synthesis unit and power generation unit will affect thethermal efficiency in the coal based polygeneration process. On one hand, the distribution ofsyngas will determine the output of chemical and power. On another hand, the proportion ofsyngas will affect the heat exchange system and steam net system. Otherwise, the amount ofunreacted syngas for circulation will also be a key factor. More circulation of unreactedsyngas means more output of chemical while cost more energy and vice versa.To solve the inconsistency, this paper takes integration of material processing and energyutilization into account in the design and optimization of a polygeneration processes. Theenergy saving ratio of the polygeneration process is used as the objective function. After theoptimization, the exergy save ratio increases by7.8%compared to the reference processes ofsingle production.更多还原