Integrations Of Mass And Energy For The Construction Of The Eco-industrial Park

The importance and application of circular economy and the similar theories, such as cleaner production and industrial ecology, are reviewed in this thesis. The relationship between circular economy and thermodynamics is emphasized. Mass conservation and energy conservation are the pillar-stones of the cycling model, which is made up with resource exploitation and manufacturing, product consumption, and waste disposal in series of industrial activities. But according to thermodynamics, the cycle can never be completely closed, because to decompose the wastes into secondary resources involves processes during which the entropy of the system is increased. The driving force of the natural ecology is the solar energy, which exists everywhere but in low density. Luckily, the bacteria can directly use solar energy to degrade organic wastes so that the diverse natural ecology can run circularly. However, to change human wastes into useful secondary resources, people have to put into energy in intensive density. To practice the idea of circular economy is very difficult. It is therefore of urgent need to search methods or ways for the promotion of circular economy, i.e. to run the industrial processes in industrial parks circularly in low cost and on a large scale.Within the projects about eco-city planning and eco-industrial park planning, the author collected data and investigated the following cases: Shanghai Chemical Industry Park (SCIP), Shanghai Xinzhuang Industry Park (SXIP), Nanjing Chemical Industry Park (NCIP) , Lubei Co. Ltd. (Lubei) and Xintai Alcohol distillery in Taicang (Xintai). Based on the information collected, this thesis tries to find methods to solve the problems of by-product and waste exchanging, energy cascading and utilities sharing among enterprises in an industrial park through mass and energy integrations so that the harmony between economy, society and environment could be reached.The alcohol production in Xintai is the case study of mass and energy integrations of enterprise scale. Based on the intensive investigation of Xintai, it was considered that the essential processes of alcohol production are the reaction and the...