Patent ID: 11873274
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Organic fine chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 11:
12. A method of regenerating triethylene glycol (TEG) in a natural-gas dehydration system, comprising:
feeding rich TEG to a TEG regeneration still column having a fired-heater reboiler comprising a burner and a reboiler vessel, wherein the rich TEG comprises TEG rich in water;
feeding air via an air control valve to the burner and fuel via a fuel control valve to the burner at a specified weight ratio of the air to the fuel, wherein the air control valve is disposed along an air conduit conveying the air from a supply header to and through the air control valve to the burner, wherein the air does not comprise ambient air, and wherein the fuel control valve is disposed along a conduit conveying the fuel to the burner;
measuring flow rate of the air via an air flow meter disposed along the air conduit conveying the air to the burner;
controlling TEG bath temperature in the reboiler vessel per a set point automatically via a control system;
controlling weight percent of oxygen gas in a stack effluent from the burner in a specified weight-percent range automatically via the control system;
removing water from the rich TEG in the TEG regeneration still column, wherein controlling the TEG bath temperature and controlling the weight percent of oxygen gas in the stack effluent comprise the control system automatically adjusting flow of the air via the air control valve to the burner and flow of the fuel via the fuel control valve to the burner at the specified weight ratio;
measuring, via an oxygen analyzer disposed along a stack having the stack effluent, the weight percent of oxygen gas in the stack effluent; and
indicating the weight percent of oxygen gas as measured to the control system, wherein controlling the weight percent of oxygen gas by the control system automatically adjusting the flow of the air and the flow of the fuel is in response to the weight percent of oxygen gas as measured, and wherein feeding the air and the fuel to the burner at the specified weight ratio comprises the control system not deviating from the specified weight ratio during the controlling of the TEG bath temperature in the reboiler vessel and the controlling of the weight percent of oxygen gas in the stack effluent.