Apparatus for supplying alternate gases to steam injection means

Details Apparatus for supplying alternate gases to steam injection means Apparatus for supplying alternate gases to steam injection means

1978-05-30

1980-10-14

Dority, Jr., Carroll B.

Combustion

Timer, programmer, retarder or condition responsive control

By condition of burner feed or feed means

431 5, 431 12, 431202, F23H 524

Patent

active

042278724

ABSTRACT:
In a flare stack system for the flaring of waste gases, in which the flare stack is equipped with steam injection parts, such as nozzles or manifolds, adjacent the flame zone at the outlet end of the stack, means are provided for alternate injection of air from a blower, or live steam, through the steam injection parts. The alternate flow is controlled by two pneumatically controlled valves, one in the blower air line, and the other in the steam line, such that when one valve is closed, the other is open, and vice versa. The objective of the alternate supply of air and steam is for the purpose of cooling the steam injection parts when the full flow of steam is not required, because there is no waste gas flow or only a minimal gas flow. In that case, the heat of the maintenance gas flow may be sufficient to injure the steam injection parts, which must be cooled by passage of a gas through them. When the ambient temperature is below freezing a small flow of steam is unsatisfactory since it readily condenses to liquid, and can form ice over the parts of the main gas flow outlets, etc. In this condition, air at low pressure is used to cool the parts and when the gas flow is large, the two valves are switched, the air is cut off and the full steam flow is initiated.

REFERENCES:
patent: 3262485 (1966-07-01), Page et al.
patent: 3771940 (1973-11-01), Stranahan et al.
patent: 3887324 (1975-06-01), Reed et al.
patent: 3917796 (1975-11-01), Ebeling
patent: 3985494 (1976-10-01), Childree
patent: 3994671 (1976-11-01), Straitz

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