DEVICE FOR CONTROLLING CONTACT OXIDATION PROCESS Russian patent published in 1998 - IPC

FIELD: NITRIC ACID PRODUCTION. SUBSTANCE: device contains: pressure gradient, pressure, and temperature sensors in ammonia and air lines; ammonia- air mixture temperature sensor; barometric pressure, relative humidity, and atmosphere air temperature sensors; pressure sensor on the executive mechanism of the ammonia line control valve; compensation unit of input controlled disturbances in temperature, ammonia and air pressure, humidity, temperature and barometric pressure of atmosphere air, connected, through sensor and unit validity control unit, with square-root generation unit and ammonia concentration computation unit connected to concentration regulator; automatic structure and/or operation mode control unit connected with validity control unit and, through discrete signal input unit, with structure selector, and also with optimal process temperature selection cut-off device, with unit cutting off process temperature adjustment circuit from ammonia concentration regulator, with unit cutting off process temperature adjustment circuit from ammonia-air uptake ratio regulator, with internal regulator structure selection unit, with temperature regulator, and with operation mode selector. EFFECT: determined and stabilized optimal process temperature and improved reliability of device. 2 dwg