Exergetic Life Cycle Assessment Of Cement Production Process

The demand of cement in our country is raising because of the need of infrastructure construction, thus the cement industry is in a stage of rapid development as China’s pillar industry. The cement industry is an industry that consumes a considerable quantity of resources and energy, and its utilization degree of resource and energy has a very large influence on the efficient use of global resources and energy. As the increasing attention of has been paid on energy shortage and environment pollution problem in our country, the requirements of energy conservation and emissions reduction for cement industry is improving. Therefore, it is urgent to analyze the actual energy utilization situation of China’s cement industry in depth. Based on the above reasons, the idea of Exergetic Life Cycle Assessment (ELCA) is proposed in this study, which aims to perform energy utilization rate analysis for the whole life cycle of cement production and provide theoretical basis and technical support for managers in the implementation of energy-saving schemes.This study mainly includes the following content:(1) On the basis of the research purpose, the scope of this study as well as the actual production of the case enterprise, the basic information and data of each production stage of cement production in case enterprise are investigated, and the collected data list is sorted, calculated and analyzed.(2) According to the basic theory and framework of ELCA, from the viewpoint of thermodynamics and using actual production data, an ELCA is conducted on the cement production process. The energy efficiency and exergy efficiency of raw material preparation system, pulverized coal preparation system and rotary kiln system in the cement production process are investigated. Thus, the utilization degree of resources and energy is determined, the general efficiency and objective efficiency of each system are compared and analyzed as well.(3) The efficiency of each system before and after waste heat power generation is compared and analyzed, so the energy-saving effect of a waste heat power generation project on each system can be determined.(4) The cleaner production technologies which can improve the energy utilization ratio in cement industry are developed and screened, and each cleaner production technology is evaluated. As the general alternative schemes for cleaner production audit, these cleaner production technologies can provide technological support for other cement enterprise.