| Eco-Industrial Park, a new economic pattern for humankind to maintain sustainable development, is a new type of industrial parks designed according to the concept of circular economy. It can not only increase the utilization coefficient of resources but also reduce the negative impacts on the environment. There're great potentials in the development of Eco-Industrial Park in the world. However, resources recycle and clean production is not enough. Energy cascade utilization should be also considered in the development of Eco-Industrial Park in order to improve the energy utilization coefficient. A new energy system for an Eco-Industrial Park is studied on the basis of the principle of energy cascade utilization. The aim of this paper is to explore the development mode of Eco-Industrial Park in China, to provide a feasible design scheme and to discuss the improvement of system performance in the park.There're many energy problems in the existing energy system of Dongguan Sintai Industrial Park, which should be improved for an Eco-Industrial Park. Basing on the principle of energy cascade utilization and the concept of Eco-Industrial parks, a reconstruction scheme for Eco-Industrial Park, which adopting diesel engines, absorption chiller, liquid dehumidification process and biogas generation to produce cooling, heating and power, is proposed in this paper. The major component of the recommended system is composed of four sets of diesel engines, which is to produce electricity for the industrial park. Waste heat from engines, including the heat from exhaust gas and the heat from jacket cooling water, is utilized for absorption refrigeration and to drive liquid dehumidification process, respectively. Moreover, the wastewater and biomass energy from the living area is recovered to generate biogas, which could be used as the fuel for diesel engines. The recommended system is becoming a multifunctional energy system with multi-energy input and multi-product output. The energy utilization coefficient is improved and the environmental pollution is reduced.The general performance of the recommended system has been analyzed from the viewpoint of the first law and second law of thermodynamics. The energy utilization coefficient and energy saving ratio are the two evaluation indicators. The analysis indicates a superior performance of the recommended system in energy utilization compared to the existing system and reference system. The contribution of each energy saving measure to the energy saving ratio of fossil energy is clarified. The essential reason of the performance improvement in the recommended system is indicated from the viewpoint of the second law of thermodynamics. Exergy balance is adapted to indicate energy utilization of each unit and indicate the essential reason of energy saving. The internal reason of the performance improvement of each subsystem is also indicated by means of Grassman Diagram and Exergy Utilization Diagram. The results achieved in this paper demonstrate that energy cascade utilization in CCHP can make significant contribution to energy saving in Eco-Industrial Park. Complementary utilization of fossil energy and renewable energy can not only reduce environmental pollution but also save energy for the Eco-Industrial Park.
|
PDF Full Text Request