| Cement industry is a typical energy and resource consumption materials industry. The increasing depletion of the resource and energy has become the bottleneck which restricts the sustainable development of cement industry. In order to meet the needs of national economy,cement industry has to maintain rapid growth in products. In this situation, if following the traditional development way,the development of the cement industry will be difficult. There will also be a threat to sustainable human development. How to use the concept of eco-industrial to achieve the ecological transformation of cement industry is the need for the economic development and the environmental protection currently. It is also the problem which the cement industry of our country is facing and needs to be solved urgently.The principal line of the paper is“pressure-status-response-performance”. Firstly,the main factors of the cement industry which will be affected by the environment are analyzed in the paper. Then the change mechanism of the main environment factors is discussed. An eco-industrial model is built based on these. Finally a measure method of the eco-industrial operation results is also provided. The main contents and achievements of research are shown as below:(1)A life cycle assessment model for the cement industry was built according to the framework of the life cycle assessment method. Comparison and analysis were made which were about the data of the resources,energy consumption and pollutant emissions of the five typical cement production processes which were the large new dry process (> 4000t/d),medium new dry process (2000-4000t/d),small new dry process (2000t/d below),traditional and JT shaft kiln. The result showed that considered the environmental impact,the sequence of the five processes was: large new dry process> JT shaft kiln> medium new dry process > small new dry process > shaft. Non-renewable resource consumption,non-renewable energy consumption and greenhouse effect were the main environmental impacts in cement production.(2)According to the basic idea of decoupling,the concept model of the absolute and relative decoupling between the cement industry development and environmental pressure were built. Adopting this model,the changing trends of energy consumption and carbon dioxide emissions of the cement industry was researched. And the contributions to the total energy consumption and carbon dioxide changes in cement industry which are done by the factors like the decomposition ratio of clinker,energy intensity,process structure,cement production and so on were researched. The results showed that:the product growth was the main cause of the energy consumption growth and the carbon dioxide emissions in cement industry. Power consumption ratio of strength and clinker were the main factors to control the energy consumption growth and carbon dioxide emissions.(3)The path that how to realize eco-industrial was discussed, from the aspects of the reduction,reuse,recycle,the four-angle and five-dimensional model was built from the layers of the target,spatial,meassure,function and the eco-industiral chain was built from the steps of transvers coupling,vertical extension,formingnetwork. Above models would help the cement industry fulfill the“green manufacturing”. It would be useful in the conversion of clean energy and the resources of bulk waste. (4)Apply on input-output method,a model of eco-industrial input-outputsystem of cement was built. Based on this mode,the metabolic path length,business association and node cycle efficiency measure were put forward. These indexes could measure the operating results of the eco-industrial operation and provided effective tools for the management and maintenance of cement industry. |
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