Influence of the interaction on NOx emission during co-combustion of combustible solid waste components

• NOx emission from all dual components decreased roughly as temperature risen.
• There were significant influences of dual component's interaction on NOx emission.
• PVC and PE played roles by changing others nitrogen conversion during combustion.
• NOx increased when the high-volatile fuel blended with the macromolecular one.

The components of combustible solid waste did not act independently during co-combustion. The characteristics of NOx emission during the combustion of individual and dual components at different temperatures were studied by using the pipe furnace and flue gas analyzer. The results showed that the influence of dual component's interaction on NOx emission was primarily due to the interaction of intermediate products from different components. Temperature affected the interaction of different components mainly by the influence on the variety of gas-phase products and the time of their forming and staying in the furnace. Once the difference of combustion characteristics between two components was large enough, the NOx emission from the co-combustion of them might increase. In most cases, the NOx emission from dual components increased due to interaction of two components during the co-combustion process.