METHOD OF PRODUCING NITRIC ACID (VERSIONS) AND PLANT TO THIS END Russian patent published in 2012 - IPC C01B21/40 

FIELD: process engineering.

SUBSTANCE: invention relates to nitric acid production and may be used in chemical industry. Compressed air is fed into one stage of gas turbine unit. Portion of compressed flow is cooled down and directed for cooling recuperative turbine 10. Major airflow is cooled in plate-type heat exchanger in feeding heated water to recovery boiler 6 and/or in steam generator while produced steam is directed for evaporation of liquid ammonia and/or heating and deaerating chemical cleaned water. Major flow is divided into two flows. First flow is fed to mixing with heated gaseous ammonia while second flow is fed into vent column16. Ammonia is oxidised by air of first flow at catalyst. Nitrose gas is cooled in recovery boiler 6 with bypass adjustment of its feed for heating end gases in two stages. Nitrose gas is aftercooled by water to condense reaction moisture in two stages. Nitrose gas is absorbed by steam condensate or desalted water. Nitric acid is blown by second pre-cooled airflow and divided into two flow, one to be fed for nitrose gas oxidation and second one to be fed into vent column 16. End gases are heated, cleaned of nitrogen oxides at catalyst, heated in gar turbine combustion chamber 19 to recover energy of off-gases in recuperative turbine 10.

EFFECT: higher efficiency and reliability.

11 cl, 2 dwg