基于CLP过程的燃煤烟气汞脱除回收及吸附剂再生的机理研究

燃煤电厂超低排放中汞污染物的脱除至关重要。本项目首次提出基于化学链过程（CLP）的燃煤烟气汞脱除回收及吸附剂再生新工艺，实现汞的有效回收与吸附剂的循环利用。对CLP系统中汞的氧化吸附、脱附回收及吸附剂的活化再生机理进行深入细致的研究。探索新型可再生金属载氧体/金属载硫体高效脱汞吸附剂的制备方法；探明其循环汞吸附/汞脱附/活化再生的机理；揭示载体吸附剂表面元素（Mn、Co、O、Fe、S）在汞吸附、汞脱附和吸附剂活化再生过程中的价态转化规律；探究反应过程中O、S、Hg元素的迁移机理；阐明载体吸附剂汞氧化吸附/汞脱附/吸附剂再生过程的反应动力学机制；探讨CLP系统各个反应器的化学反应历程与最佳工艺参数；建立CLP过程吸附-脱附-活化-再生总过程的反应动力学模型。发展燃煤烟气汞吸附脱除、汞脱附、汞回收、吸附剂再生的理论体系。以期孵化出具有我国自主知识产权的燃煤烟气汞脱除回收及吸附剂循环利用新技术。

Mercury emission from coal combustion has seriously harmed environment and human health. This project, based on the chemical looping process (CLP), proposes a novel technological concept of integrated mercury removal, mercury recovery and sorbent regeneration system. The technology can be used for mercury effective recovery and sorbents recycling for coal-fired power plants. The mercury oxidation and adsorption, the mercury desorption and recovery, as well as the sorbents activation and generation in CLP system will be thoroughly studied in experiments and mechanisms. The recycled mercury adsorption ability of the carrier sorbents will be studied to explore its preparation methods of high efficiency, its regeneration of the carrying oxygen and sulfur sorbents, and the mechanisms of sorbents activation and regeneration. The valence change of the oxygen-carrying metals (Mn and Co) and the sulfur (S), as well as the migration of O, S, and Hg elements on carrier sorbents surface in the processes of mercury adsorption, mercury desorption and sorbents activation will be recognized. The kinetic mechanisms of mercury oxidation and adsorption, and the mechanisms and conditions of mercury desorption and recovery on carrier sorbents surface will be detected. The reaction processes of CLP system and the reaction mechanism and pivotal technology parameters in each reactors in CLP system will be studied. The kinetic models describing the total process of adsorption, desorption, activation and regeneration in CLP system and the mechanism model describing O, S, Hg elements migration in reaction processes will be established. The theory system of mercury adsorption and recovery, as well as sorbent regeneration will be developed through this study. It is hopefully to see a new technique of chemical looping process for mercury recovery and sorbent recycling in power plants in the near future following accomplish of this project.