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US 5,295,816 AGranted
Method for high velocity gas injection
AssigneePraxair Technology, Inc.
InventorsHisashi Kobayashi, Arthur W. Francis, Jr.
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Abstract
High velocity gas injection system wherein high velocity and low velocity gases are injected into a cavity in a defined relationship such that the low velocity gas forms a protective barrier from combustion zone damage due to the flow dynamics caused by the high velocity gas.
Claims9
A method for injecting high velocity gas into a combustion zone comprising:
- (A) providing a cavity having an opening with a diameter LD communicating with a combustion zone containing furnace gases;
- (B) injecting a main gas stream from a nozzle into the cavity at a point recessed from the opening in a direction toward the opening at a high velocity exceeding 200 feet per second, said recess having a length L such that L/D is not more than 3.0;
- (C) injecting protective gas, having a composition substantially the same as that of the main gas, into the cavity at a point further recessed from the opening than the nozzle at a low velocity not more than 100 feet per second and a t a flowrate such that the protective gas is within the range of from 10 to 50 percent of the total gas injected into the cavity;
- (D) passing protective gas around and past the nozzle and entraining protective gas into the main gas stream downstream of the nozzle;
- and
- (E) drawing furnace gases from the combustion zone into the cavity and entraining furnace gases into the main gas stream within the cavity but downstream of the nozzle and preventing combustion near the nozzle within the cavity.
3 more elements
Dependencies are inferred from the claim text.