链式能量系统热经济孤立化的实现方法

引　言人们把主要过程涉及能量转换、传输、利用和回收的系统称作能量系统 .在化工行业中有许多能量系统 ,其中不少是链式能量系统 .该系统由许多单元或称单元设备串结而成 ,并且各单元允许与系统的外界进行物流、能流的交换 ,见图 1.在对能量系统进行设计时 ,不仅应考虑系统在运行期间的能效率 ,还应考虑系统的建造与维护费用 .因此对能量系统的设计决策 ,要兼顾能效率问题 (或称热问题 )和建造与维护费用的经济问题这两个方面 ,即为热经济决策 ,以达到节能与节资的综合最优效果 .当进行系统设计参数的热经济决策时 ,常将系统划分为诸个单…

METHOD OF THERMOECONOMIC ISOLATION ON CHAIN ENERGY SYSTEMS

In chemical,oil refinery and power industries there are many chain energy systems.Socalled chain energy system is made up of some unitary devices chained up,and each unit is allowed to exchange energy or mass with the outside of the system.Applying the idea of thermoeconomic isolation,a new method of thermoeconomic isolation on the chain energy systems is presented,and its convergence is proved meanwhile.It is the essene of the method to achieve thermoeconomic isolation on chain energy systems that two known parameters located at the start unit and the end unit are used to adjust and determine the unknown maginal exergy cost of each unit by the way of press and squeeze,and make them converge on correct result.An example of applying the method to a nonlinear chain energy system shows that the method is effective. The method will help to break a new path to make thermoeconomic isolation be achieved in other types of energy system.