Nox reducing
- 1. AIR POULLTIONAND QUAILTYCONTROL Application of Removal Gases Nox Presented by: C G MOHAN Asst Professor GPCET
- 2. Oxides of Nitrogen include NO--------Nitric Oxide NO2-------Nitrogen Dioxide N2O-------Nitrous Oxide N2O3------Di Nitrogen Oxide N2O5------Di Nitrogen Pent oxide Out of these two are major pollutant among them are NO and NO2
- 3. Nitrogen dioxide is an irritant gas, which at high concentrations causes inflammation of the airways. When nitrogen is released during fuel combustion it combines with oxygen atoms to create nitric oxide (NO). This further combines with oxygen to create nitrogen dioxide (NO2). Nitric oxide is not considered to be hazardous to health at typical ambient concentrations, but nitrogen dioxide can be. Nitrogen dioxide and nitric oxide are referred to together as oxides of nitrogen (NOx). NOx gases react to form smog and acid rain as well as being central to the formation of fine particles (PM) and ground level ozone, both of which are associated with adverse health effects
- 4. NOx is produced from the reaction of nitrogen and oxygen gases in the air during combustion, especially at high temperatures. In areas of high motor vehicle traffic, such as in large cities, the amount of nitrogen oxides emitted into the atmosphere as air pollution can be significant. NOx gases are formed whenever combustion occurs in the presence of nitrogen e.g. in car engines; they are also produced naturally by lightning
- 13. COMBUSTION PROCESS CAN BE CONTROLLED BETTER REDUCE MAXIMUM COMBUSTION TEMPERATURE ADDITIONAL COST OF FUEL INJECTOR AND PIPING INCREASE IN MAINTENANCE COST 30% REDUCTION IS ACHIEVABLE
- 14. 14% REDUCTION IS POSSIBLE BY LOWERING CHARGE AIR TEMP. FROM 40oCto 25oC REDUCE COMBUSTION TEMPERATURE SUITABLE FOR MEDIUM AND HIGH SPEED ENGINES COOLING AIR TOO MUCH COULD LEND TO COMBUSTION PROBLEMS
- 15. DURING COMBUSTION THROUGH SPECIAL INJECTOR REDUCES THE BULK TEMPERATURE OF COMBUSTION 40% REDUCTION IN NOx EMISSION IS ACHIEVED
- 17. SELECTIVE CATALYST REDUCTION IS THE PROCESS OF REDUCING Nox COMPOUNDS WITH AMMONIA INTO NITROGEN AND WATER VAPOURS IN PRESENCE OF CATALYST
- 18. REDUCTANT STORAGE TANK PUMP VAPORIZER (NOT IN CASE OF ANHYDROUS AMMONIA) MIXER INJECTION NOZZELS CATALYST CHAMBER
- 20. AFTER TREATMENT TECHNIQUE REDUCTANT(AMMONIA) IS INJECTED AND MIXED INTO EXHAUST PASS THIS MIXTURE THROUGH CATALYST CHAMBER TEMPERATURE OF CATALYST CHAMBER SHOULD BE 450K-720K
- 21. ANHYDROUS AMMONIA(a colourless gas with pungent, suffocating fumes, is used as an agricultural fertilizer and industrial refrigerant) AQUEOUS AMMONIA (NH4OH) UREA CATALYST: BASE METAL OXIDES SUCH AS (VANADIUM AND TUNGSTEN) TITANIUM OXIDE ZEOLITE (HIGH TEMPERATURE DURABILITY)