Research On The System Stability And Control Of Eco-industrial Park

Eco-industrial park is a geographical complex consisting of nature, industry and society. It is a new industrial organization designed by the theory of recycling economics and the principles of industrial ecology. It is also the implementation form of recycling economy development model as well as the developing direction of the world industrial park. It is through the exchange of by-products and wastes, stepwise use of energy and water among the members that the coordinated development between economic and environmental benefits in eco-industrial park are realized. Eco-industrial parks have become an important practice of building ecological civilization and exploring new methods of environmental protection.In view of the existing problems during the current development eco-industrial parks, this paper argues that the stability and control of park system is the key issue worthy to study. In this paper, it employs both theory proof and quantitative analysis as research approaches, refers to and utilizes tools of ecology, management science, environmental science, economics and mathematics to make theoretical argument, and uses Changsha Economic and Technological Development Zone as an empirical studying case. Moreover, some quantified results about the stability and control of the park system are presented, and some reflection and suggestions are put forward using mathematical modeling and. some quantitative analysis tools from other disciplines. All these obtained results would provide scientific and technological support and decision reference for the stability analysis and control of the eco-industrial park, which will guide the planning and construction of the eco-industrial park in a more scientific way.First, after reviewing and analyzing the current status of development of the eco-industrial park and related theoretical research, we argued that the given definition of the stability of a park system, which only depicts the park stability based on the definition of natural ecosystem, does not reflect its characteristics as an artificial system. Comparing the artificial ecosystems with park system, we conclude that the eco-industrial park be measured by three indexes:anti-jamming capability, economic productivity and environmental benefits, which makes the stability of the park system quantified. On further research, it is indicated that the indexes, which evaluate the stability of eco-industrial park, function through the eco-industrial chains. This paper also employs the dynamic programming model to evaluate the stability of eco-industrial chain and to obtain some optimization results under certain costs and risks.Second, on analyzing the formation mechanism of eco-industrial chain of the park, this paper concludes that eco-industrial chains are mainly divided into two categories:one is symbiosis formed by cascade utilization of the same resources or energies, and the other is symbiosis formed by exchanging different by-products on the product chain. (1) For the former, by taking the waters resources as an example, and using the game theory to analyze the motivation of the related participants who are the members of the system of resources cascade utilization, this article concludes that the best strategy is a function of the prices of water p, the prices of reused water r, the processed cost of water s, and the cost of delivered waste water t. In addition, the mechanism of this system is also analyzed in detail. (2) For the latter, by using the Shapley value, the economic benefit of the companies in the chain is distributed according to their efficiencies, which can increase their ability of anti-jamming.Thirdly, by analyzing the topological structure of the eco-park, the whole system is divided into three layers:cluster, main eco-industrial chain and the nuclear company, which makes both the structure of the system and the target of control clear. Based on the Normal Laplace matrix, the park system is parted to some clusters. Then, according to the properties of the maximum positive eigenvalue and related eigenvectors, the companies in the eco-industrial park are rearranged according to their importance and hence the nuclear companies are found. Furthermore, the main eco-industrial chain associated to the nuclear companies can be found by the method of MatLab software programming.Finally, considering the present trend of low-carbon economical development and using one of the control methods for the stability of the eco-industrial park, the transformation of the eco-industrial park to the low carbon park has been discussed.