Abstract: The invention relates to a method for decreasing the spread of the tube temperatures between tubes in a process involving the heating of at least one fluid in a furnace that comprises at least one radiation chamber with radiant walls, at least one essentially vertical row of tubes inside of which circulate the at least one fluid to be heated, and being equipped with burners that heat the tubes, where the method comprises the steps of: determining, for each of the tubes the skin temperature of the tube, selecting the 50% tubes having the lowest temperatures determined, the process being stopped, realizing on each tube selected an operation that decreases the flow of the fluid distributed to said tube while keeping the total flow rate of the fluid unchanged.

Abstract: The invention relates to a method for decreasing the spread of the tube temperatures between tubes in a process involving the heating of at least one fluid in a furnace that comprises at least one radiation chamber with radiant walls, at least one essentially vertical row of tubes inside of which circulate the at least one fluid to be heated, and being equipped with burners that heat the tubes, where the method comprises the steps of: determining, for each of the tubes the skin temperature of the tube, selecting the 50% tubes having the lowest temperatures determined, the process being stopped, realizing on each tube selected an operation that decreases the flow of the fluid distributed to said tube while keeping the total flow rate of the fluid unchanged.

Abstract: The present invention relates to a process for the steam reforming of a hydrocarbon mixture in order to produce synthesis gas.

Abstract: A steam generator includes at least two successive combustion hearths with at least one burner supplied with fuel and oxidizer, a vaporization zone comprising a vaporization exchanger, a superheating zone comprising a superheating exchanger, a preheating zone comprising a preheating exchanger and a collecting drum, Each hearth includes at least one vaporization exchanger.

Abstract: The heat recovery boiler (1) is operated, at least temporarily, by feeding its combustion system with air (13) and with a stream (15) of flue gases (4) recycled to a level of at least 45%, typically between 50 and 65%, so as to allow the efficiency of the boiler to be increased and to decouple it, at least temporarily, from the combustion engine (8) driving a generator (9), the exhaust gases from which are burnt in post-combustion mode in the boiler in cogeneration mode.

Abstract: The heat recovery boiler (1) is operated, at least temporarily, by feeding its combustion system with air (13) and with a stream (15) of flue gases (4) recycled to a level of at least 45%, typically between 50 and 65%, so as to allow the efficiency of the boiler to be increased and to decouple it, at least temporarily, from the combustion engine (8) driving a generator (9), the exhaust gases from which are burnt in post-combustion mode in the boiler in cogeneration mode.

Abstract: This invention is related to so-called combined cycle co-generation installations, and it addresses present concerns of the industry. Among these, combustion stability, corrosion (due to large water content in the flue gases), large heat transfer areas, and the like. In some embodiments, an additional heat exchanger is added to heat combustion air with a portion of the exhaust gases resulting from an engine, preferably a gas turbine. As a result, the efficiency of the cycle will improve, the oxidant will be enriched by above 50% oxygen, the combustion process will be enhanced, and the dimensions of the boiler may be reduced. It is considered that the combustion air will require between 10% and 80% of the total flue gas volume, more preferably between 20% and 40%. This is the portion of the flue gases sent through the heat exchanger. A control system designed to optimize the flow of the different streams is also presented.