Process and apparatus for preventing NOx emissions after emergency shutdowns of plants for the manufacture of nitric acid
Patent
·
OSTI ID:5141504
The process and apparatus described seeks to prevent NOx emissions after an emergency shutdown in a process for manufacturing nitric acid by catalytic combustion of ammonia, compression of the nitrous combustion gases and subsequent absorption. Immediately on shutdown the intake nitrous gas supply to the compressor is interrupted, the residual intake side nitrous gases are conveyed to the delivery side, the delivery side gas volume is shut off, the gas on the delivery side is expanded to the intake side and then exhausted into a vacuum system. Subsequently the acid charged with nox in the absorption stages is drawn off, degassed acid is circulated through the absorption stages until equilibrium is established, the pressure of the shutoff section is released and cooled acid is admitted to the absorption stages.
- Assignee:
- Davy Mckee Ag (Germany, Federal Republic Of)
- Patent Number(s):
- US 4330520
- OSTI ID:
- 5141504
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
ACCIDENTS
AIR POLLUTION CONTROL
CHALCOGENIDES
CONTROL
EQUIPMENT
HYDROGEN COMPOUNDS
INDUSTRIAL ACCIDENTS
INORGANIC ACIDS
NITRIC ACID
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PRODUCTION
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
ACCIDENTS
AIR POLLUTION CONTROL
CHALCOGENIDES
CONTROL
EQUIPMENT
HYDROGEN COMPOUNDS
INDUSTRIAL ACCIDENTS
INORGANIC ACIDS
NITRIC ACID
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
PRODUCTION