Study Of Approach To Total Site Energy Lntegration

Based on the significance of the total site energy integration in the energy ~ving and cleaner production in the process industry, and the state of the art ~nd development tendency of the technology of Total Site energy integration ~ih;ch includes the heat and power system, the task of the Total Site energy ~n~jration has been studied by using the approaches of the single process h~t and power integration 梡inch analysis and mathematical programming.According to three different types of the total site energy integration ?r:~trofit of an existing site, site expansion and grassroots design, the author has ~wanced a systematic analysis method and proved the effect of this method while used in the industry case study. The main achievements of the dissertation are as follows:1.Through arranging the heat exchange among the different processes, th~ Total Site energy integration is to allocate the relationship between the neat engines and back pressure steam of heating reasonably, which minimize th~ total energy consumption Because heat and power integration is a kind of strain, in order to solve this problem effectively, the author combines two ,i~thods of the single process heat and power integration, namely, pinch ~r~lysis and mathematical programming, absorbs the advantages from both of ~ uses them in the total site energy integration and advances the .~proach and strategy of the total site energy integration2.Using the plus/minus principle for single process in pinch analysis, the analysis principle梩he plus/minus principle for total site and the steam load shifting principle are established:0Any increase in supply or reduction in demand of steam above the Site Pinuh leads to fuel savings and reduction in co-generation potential, and if thechanges occur below the site pinch, the co-generation potential increases, but the fuel consumption remains unchanged.?If the steam levels involved in are on the same side of.the site pinch, co-generation potential Increases; if the steam levels at the site pinch are affected, it will lead to fuel savings and reduction In co-generation potential. Applying these principles, it is effective to judge how the improvements in process and utility system affect the total fuel consumption and co-generation potential In the interaction between the total process and utility system.3.Based on the established total site energy integration, the systematic analysis approaches for the retrofit of an existing site and site expansion are presented. For the retrofit, using this approach contributes to establish the scope of retrofit and screen the options, in the early conceptual design, and guides the process changes, which saves the fuel and increases the cogeneration potential. For the site expansion, considering the total site system, three strategies are put forward to improve the total site system economics.4.For the grassroots design in the total site system, the multiple operations are considered. First, the steam main is optimized in all the operations with the total site pinch analysis considering of all the operations Second, the super-structure among the different steam levels is established, described with mathematical model, and build strong foundation for solving this kind of problem with mathematical programming.In conclusion, the approaches and strategies of the total site system energy integration have been studied in detail in this paper. The single process pinch analysis approaches are applied extensively and the theory and application of this approach is Improved to a certain degree.