Method for the combustive treatment of waste fluids containing nitrogen compounds

Claim 1

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.

Claim 2

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.

Claim 13

A method for treating a waste fluid containing a compound having a nitrogen-hydrogen bond 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 an auxiliary fuel through said burner to said primary combustion chamber for burning 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 is formed; (b) causing the combustion gas in said primary combustion chamber to pass through said throat while injecting into said throat portion the waste fluid for mixing with the 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 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 the secondary combustion chamber.

Claim 14

A method for treating a waste fluid containing a compound having a nitrogen-hydrogen bond 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 an auxiliary fuel through said burner to said primary combustion chamber for burning 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 is formed; (b) causing the combustion gas in said primary combustion chamber to pass through said throat while injecting into said throat portion the waste fluid for mixing with the 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 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 the secondary combustion chamber.