Coupling Optimization Of Refinery Systems And Analysis Of Systems Based On Carbon Trading

As the key part which supplies energy in refinery,the steam power system mainly provides steam,electricity and other utilities for the production process system to ensure the normal processing;As the main source of economic benefits of the refinery,the production process system is mainly responsible for the refining and sale of various oil products.The two systems are closely coupled and complement each other.The traditional subsystem optimization methods tend to result in low energy utilization and waste of resources,the coupling system optimization method based on the exchange relationship of material and energy flow has become the focus of this paper.In addition,in order to implement the “energy saving and emission reduction” policy,the carbon trading platform is supposed to be intelligently used.Taking carbon trading into the total objective function of the coupled system will benefit to more macro and practical regulation of the refinery.The main research contents of this paper are as follows:(1)On the basis of previous studies,the mathematical models of unit equipments such as boilers and steam turbines are constructed.Besides,unit equipment load constraints,material balance and other key constraints have been imposed on the system in consideration of actual operational datas of the case.Finally,a complete steam power system model with the goal of optimal system economic cost is abstracted.(2)The production process system model is established based on the parameters of the main processing equipments of the refinery and the material balance between them.Considering the flow of steam,fuel and other material and energy flow between the two systems,the coupling and constraint relationship of material and energy flow between the two systems is established,finally the coupling system optimization model with the goal of optimal economic cost is abstracted.The coupling model is applied to a practical case of a petrochemical enterprise in the north.The CPLEX solver of GAMS mathematical modeling software is used to solve the problem,and the ideal optimization result is obtained,finally the validity and advantages of the model are verified.(3)The carbon transaction cost is introduced into the objective function of the coupled system model to form a coupled system model considering carbon trading.Combining the actual data of the case,the GAMS modeling software is used for the optimization solution;in the same situation,the validity and economic optimization potential of the model is further verified by comparing with the original coupled system model;reasonable carbon allowance for the refinery is explored and specific scheduling scheme is given.Based on the background and trend of refinery system optimization,this paper builds a multi-period coupling optimization model of steam power system and production system based on previous research,then the carbon trading is introduced into the coupling optimization model.By applying them to the actual case and using relevant optimization solving software,the practicability of the model has been verified,and it can provide guidance for the actual production of the enterprise from the perspectives of economy and energy conservation.