Patent ID: 8282389

Claim:
A modular flare stack for enclosed flame combustion of a combustible fluid, comprising: a gas feed pipe having a gas pressure detector configured to measure gas pressure; at least two burner elements configured to combust the combustible fluid, wherein each of the at least two burner elements is equipped with a system configured to obtain a fully premixed air-fuel mixture; and a controller, wherein each of the at least two burner elements comprises: a gas inlet configured to receive the combustible fluid from the gas feed pipe, a replaceable gas permeable combustion surface, a mixing chamber, a combustion chamber, a temperature detector configured to measure a flue gas temperature, an air-excess modulator connected to the mixing chamber, and a vertically movable insulated stack, wherein the controller is configured to be responsive to the gas pressure detector, to be responsive to the temperature detectors, and to control the air-excess modulators.