초록 ▼

A system and method for protecting a nozzle that injects a high velocity main gas into a furnace or combustion zone. The nozzle is located in a passage recessed from the exit port opening of the passage which communicates with the combustion zone. Purge gas is passed into the passage upstream of the

A system and method for protecting a nozzle that injects a high velocity main gas into a furnace or combustion zone. The nozzle is located in a passage recessed from the exit port opening of the passage which communicates with the combustion zone. Purge gas is passed into the passage upstream of the nozzle. The volume of the purge gas exceeds 50% of the total volume of the main gas and purge gas and the purge gas has a velocity of at least 100 ft/sec thereby preventing furnace gases from entering the passage and attacking the nozzle.

대표청구항 ▼

[ I claim:] [1.] A unit for injecting a main gas into a furnace combustion zone through a passage in a wall of the furnace having an exit port opining with a diameter D communicating with the combustion zone, the unit comprising:a nozzle in said passage positioned at a recess distance L from the exi

[ I claim:] [1.] A unit for injecting a main gas into a furnace combustion zone through a passage in a wall of the furnace having an exit port opining with a diameter D communicating with the combustion zone, the unit comprising:a nozzle in said passage positioned at a recess distance L from the exit port opening for injection of high velocity main gas into the passage toward the exit port opening; andmeans for providing purge gas, said purge gas having a composition substantially the same as that of the high velocity main gas, into the passage at a point further recessed from the exit port opening than is the nozzle for flow of purge gas around and past the nozzle to prevent furnace gases from entering said passage and attacking the nozzle wherein the purge gas volume is greater than 50% of the total of the main gas and purge gas and the purge gas has a velocity greater than 100 ft/sec.