提出钙基吸收剂循环吸收燃煤烟气CO2过程耦合生物质焦还原NOx的思路，利用煅烧钙基吸收剂作为载热体热解生物质，在钙基吸收剂碳酸化反应过程同时实现CO2/SO2吸收和生物质焦还原NOx，在各污染物协同脱除之间形成相互促进的格局，突破设置多个反应过程分别脱除污染物的局限。研究煅烧钙基吸收剂作为载热体时生物质热解和成焦特性，阐明钙基吸收剂和颗粒流动对生物质热解及其焦物理化学特性的影响机制；揭示钙基吸收剂化学组分、晶体结构、微观结构、吸收CO2活性及两相流中颗粒流动状态对生物质焦还原NOx反应的影响机理，发展钙基吸收剂循环吸收CO2与生物质焦还原NOx的耦合控制方法；提出改性方法同时提高钙基吸收剂吸收CO2性能和生物质焦还原NOx性能，并揭示机理；探讨生物质热解过程与钙基吸收剂循环吸收CO2/生物质焦还原NOx耦合过程的匹配和优化；以期为发展我国煤炭能源的高效清洁利用新技术提供理论基础。

The CO2 capture process from flue gas of coal-fired power plants using calcium-based sorbents coupled with NOx reduction by biochar is proposed in this project. Calcium-based sorbents after calcination is used as a heat carrier for biomass pyrolysis. CO2/SO2 capture by calcium-based sorbent and NOx reduction by biochar from biomass pyrolysis are simultaneously achieved in carbonation process of calcium-based sorbents. And then the mutual promotion of different pollutions (such as CO2, SO2 and NOx) control processes would take place. In this project, the pyrolysis performance of biomass and the physical/chemical properties of biochar under calcined calcium-based sorbents as the heat carrier will be investigated. The mechanism of influence of calcium-based sorbent and particle flow behavior on physical/chemical properties of biochar will be discussed. The effects of chemical components, crystal structure, microstructure and CO2 capture activity of calcium-based sorbent and the particle flow behavior in gas-solid two phase flow on NOx reduction by biochar will be revealed. The coupled control approach on CO2 capture capacity of calcium-based sorbent and NOx reduction activity of biochar will be developed. The method to simultaneously improve CO2 capture capacity and NOx reduction activity will be studied and the mechanism will be revealed. The matching and optimization of the process of biomass pyrolysis and the process of CO2 capture by calcium-based sorbent/ NOx reduction by biochar will be discussed. The project research will provide a theoretical basis to develop a new technology for high-efficiency clean usage of coal energy in China.