초록 ▼

A purge control system for flare gas stacks is described in which provisions are made for start up, steady state or transient purge gas control, and for failure of the purge gas supply, and also takes into account variable windspeed at or near the top of the stack, flow or non-flow of purge gas and

A purge control system for flare gas stacks is described in which provisions are made for start up, steady state or transient purge gas control, and for failure of the purge gas supply, and also takes into account variable windspeed at or near the top of the stack, flow or non-flow of purge gas and waste gas in the stack, ambient temperature and temperature of the advancing gaseous medium in the stack, oxygen content of the gas at a predetermined location in the stack, the system including provisions for pilot burner gas supply and ignition with protection against pilot burner operation under undesired conditions, an indicating panel being employed to advise the operator of the prevailing operating conditions so that, if desired, appropriate action can be taken by the operator.

대표청구항 ▼

Control apparatus for a flare gas stack which comprises in combination with a flare gas stack a connection to said stack from a supply of waste combustible gas for combustion at the discharge end of the stack, a connection to said stack from a supply of purge gas for controlled delivery of purge gas

Control apparatus for a flare gas stack which comprises in combination with a flare gas stack a connection to said stack from a supply of waste combustible gas for combustion at the discharge end of the stack, a connection to said stack from a supply of purge gas for controlled delivery of purge gas to said stack, a gas pilot burner for igniting of gas at the discharge end of the stack, and means for controlling the operation of said pilot burner, said means including a flow sensor for said stack for preventing activation of said pilot burner when no gas flow in said stack is sensed by said flow sensor.