Research On The Material Flow Stability Of By-products In The Industrial Symbiosis Network

The industrial symbiosis network (ISN) was born to solve the conflict between economic growth, social progress and resource consumption, environmental pollution. The operational goal of the system was to balance the economic benefits and environmental benefits. Owing to the special internal structure and external goals, the boundary condition of the structure and operation mechanism in the ISN is more rigorous and complicated than common industrial clusters, which leads to worse stability.When the ISN structure has been determined, because upriver corporations'by-products serve as the material of downriver corporations, the supply of upriver corporations'by-products could influence downriver corporations'order decision of material, and then influencing by-products in stock. Finally industrial symbiosis relationship could increase costs in whole ISN, decrease symbiosis benefits, destroy the system's stability and raise the risk of disintegration.This article focused on the material flow stability of by-products between corporations in the ISN. Quantitative research and qualitative analysis were adopted to research the characteristic and the influence factor of the material flow stability of by-products in corporations. The quantitative relations among the material flow stability of by-products and industrial symbiosis cost value added and by-products inventory costs were also researched. The mechanism and rule that the material flow stability of by-products influences the operation of the ISN were explored in this article, which conclusions can help to improve the industrial symbiosis benefits and to enhance the structure stability of the ISN.First, in terms of the statistics, from the intension of the stability concept, the concept of the material flow stability of by-products in the ISN was presented based on industrial ecology and industrial symbiosis theory. In accordance with the above concept the quantitative model of the material flow stability of by-products was established. Through theoretical analysis and simulation verification, we found that when the ISN structure has been determined, the only effective means to enhance the material flow stability of by-products is to eliminate the variance of the by-products material flow by by-products management agency's modulation. And then the model of the material flow stability of by-products which modulated by by-products management agency could be established through the same way above. It also can be validated. Based on above research conclusion, the research was further extended to the quantitative model of the net material flow variance of by-products. After determined the optimal stock strategy, the quantitative relations could be established among the net material flow variance of by-products, the industrial symbiosis cost value added and by-products inventory costs. Through theoretical analysis and simulation verification, we could reach the overall optimum strategy which could minimize the industrial symbiosis cost value added and by-products inventory costs. During put above strategy into practice, we could come across plenty of problems in the information sharing. Aiming at these problems, based on the principal-agent theory, the incentive mechanism facing upriver corporations was designed. The application integration framework based on Web Services technique was proposed for information sharing with the by-products management agency, and then the procedure that the by-products management agency integrates and calls for information from corporations in the ISN was analyzed in detail. Finally, above conclusions were applied to a CO2 eco-industrial chain in Melic Sea Group for the material flow stability analysis of by-products. The result of analysis could validate all research conclusions.