| Summary: | Post-combustion technology is a new kind of low-nitrogen combustion technology. To achieve the combined removal of nitrogen oxides (NO<i><sub>x</sub></i>) and sulfur dioxide (SO<sub>2</sub>) emissions, the post-combustion technology combined with the sorbent injection in the furnace and post-combustion chamber is proposed. Experiments investigating the effects of the sorbent addition in a post-combustion chamber and post-combustion air arrangement on NO<i><sub>x</sub></i> and SO<sub>2</sub> emissions were conducted in a 0.1 MWth circulating fluidized bed test platform. In addition, a comparative analysis of the NO<i><sub>x</sub></i> and SO<sub>2</sub> emissions under both combined removal methods was also performed. The results indicated that adding sorbent to the post-combustion chamber can reduce SO<sub>2</sub> emissions, but further increasing the amount of sorbent will not significantly improve the desulfurization effect. The injection position of the post-combustion air will affect the emissions of NO<i><sub>x</sub></i> and SO<sub>2</sub> in the flue gas. When the three-stage distribution of post-combustion air is adopted, the further back the third nozzle is distributed, the lower the temperature in the post-combustion chamber, which is beneficial to the control of NO<i><sub>x</sub></i> and SO<sub>2</sub> emissions. Compared with the conventional combined removal method, the NO<i><sub>x</sub></i> emissions were significantly reduced under the new combined removal method. Through secondary desulfurization in the furnace and post-combustion chamber, oxygen-deficient combustion in the furnace can achieve the combined removal of NO<sub>x</sub> and SO<sub>2</sub>.
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