Research of the Efficiency of a Secondary Catalyst for Nitrous Oxide Emission Reduction at a Nitric Acid Plant

摘要

Installing a secondary decomposing catalyst is an effective method for nitrous oxide emission reduction at a nitric acid production facility. Before the installation of a decomposing catalyst at a nitric acid plant in Devnya, Bulgaria, the N_2O concentration in the tail gas was 1,754 mg/Nm~3 while after the installation the N_20 concentration was 212 mg/Nm~3, which is almost 8.3 times lower. For the entire monitoring period a total N_2O emission reduction of 7,021 Mg was achieved. Research of the catalyst's behavior during the production campaign has been done, proving that the achieved reduction level depends on the catalyst's functional activity and the technological process conditions. Planning the duration of the decomposing catalyst's efficient operation throughout N_2O monitoring data analysis provides effective emission reduction.