초록 ▼

A waste fluid containing nitrogen compounds is combusted in an incinerator having cylindrical primary and secondary combustion chambers connected in series by a venturi throat member. The waste fluid is combusted in the primary combustion chamber at a temperature of at least 1200°C. while injecting

A waste fluid containing nitrogen compounds is combusted in an incinerator having cylindrical primary and secondary combustion chambers connected in series by a venturi throat member. The waste fluid is combusted in the primary combustion chamber at a temperature of at least 1200°C. while injecting air into the primary combustion chamber in a direction tangential to the inner periphery thereof so that the combustion gas forms a vortex pattern therein. The whirling combustion gas containing nitrogen oxides is caused to pass through the venturi throat into which a gas or liquid containing a compound having a nitrogen-hydrogen bond is injected for mixing with the combustion gas and the mixture is combusted in the secondary combustion chamber at a temperature of between 850°and 1150°C. The nitrogen oxides produced in the primary combustion chamber are reduced by reaction with the nitrogen-hydrogen bond-containing compound so that the exhaust gas from the secondary combustion chamber has a low content of nitrogen oxides.

대표청구항 ▼

A method for treating a waste fluid containing a nitrogen compound by combustion in an incinerator having cylindrical, coaxially aligned primary and secondary combustion chambers connected in series with each other by a joining member provided with a throat portion which widens toward both combustio

A method for treating a waste fluid containing a nitrogen compound by combustion in an incinerator having cylindrical, coaxially aligned primary and secondary combustion chambers connected in series with each other by a joining member provided with a throat portion which widens toward both combustion chambers, and a burner located in said primary combustion chamber, said method comprising: (a) feeding the waste fluid through said burner to said primary combustion chamber to burn combustible materials in the waste fluid at a temperature of at least 1200°C. while injecting air into said primary combustion chamber at a velocity and in a direction tangential to the inner periphery thereof to establish a vortex therewithin, whereby a whirling combustion gas containing nitrogen oxides is formed; (b) causing said combustion gas in said primary combustion chamber to pass through said throat portion while injecting thereinto a fluid containing a compound having a nitrogen-hydrogen bond for mixing with said combustion gas; (c) introducing said mixture from said throat into said secondary combustion chamber in a diverging pattern thereby producing a pressure drop in the center of said secondary combustion chamber whereby gases in the vicinity of the outlet of the secondary combustion chamber will reverse flow back toward said throat to minimize local variations in temperature and concentration; (d) burning said combustible materials in said mixture in said secondary combustible chamber at a temperature of between 850°and 1150°C; (e) controlling the amount of air injected into said incinerator so that the residual oxygen content in the resulting waste combustion gas discharged from said secondary combustion chamber does not exceed 5% by volume; and (f) discharging said waste combustion gas from said secondary combustion chamber.