초록 ▼

The present invention relates to a method for the noncatalytic reduction of NOx in combustion gases which method includes maintaining an excess of fuel to air during combustion, cooling the combustion gases to between 2400°F. and 3000°F., and injecting into the cooled gases ammonia in a ratio 1:1 to

The present invention relates to a method for the noncatalytic reduction of NOx in combustion gases which method includes maintaining an excess of fuel to air during combustion, cooling the combustion gases to between 2400°F. and 3000°F., and injecting into the cooled gases ammonia in a ratio 1:1 to 1:4 NOx to NH3. After the ammonia has been injected to reduce the NOx, the gas is further cooled to between 1900°F. and 2300°F. and secondary air injected into the gases to complete combustion of the fuel.

대표청구항 ▼

A method for reducing the NOx present in combustion gases which results from the combustion of fossil fuels with air, said method comprising the steps of a. controlling the air/fuel mixture for combustion to obtain fuel rich combustion gases in the combustion zone; b. maintaining or cooling the temp

A method for reducing the NOx present in combustion gases which results from the combustion of fossil fuels with air, said method comprising the steps of a. controlling the air/fuel mixture for combustion to obtain fuel rich combustion gases in the combustion zone; b. maintaining or cooling the temperature of the combustion gas downstream of said combustion zone in a first zone at between about 2500°F. and 3000°F.; c. injecting ammonia in a molar ratio of 1:1 to 4:1 (NH3/NOx) into the combustion gases at the first zone; d. reducing the temperature of the combustion gases at a second zone to between 1900°F. and 2400°F.; and e. injecting secondary air into the combustion gases at the second zone to complete combustion of the fuel.