The majority of technical publications and articles referring to the production of steam in installations of cogeneration with gas turbines, or engines, they mention recovery water-tube boilers. They forget about the pyrotubular type, and their indisputable advantages as opposed to the water-tube boilers design in certain circumstances.
In a shell boiler, the boiling water is situated in the interior of the cylindrical shell, normally horizontal, the heat is provided by the hot gases that circulate in the interior of the tubes which form the surface of the thermal interchange. In a conventional generator, the hot gases are generated by the combustion of fuel in a fireplace, while in a cogeneration boiler the heat comes from the escape gases of the turbine or the engine.
Within the outstanding cogeneration pyrotubular units are two basic different designs:
- Steam boiler model CR with gas turbine or engine from one-step.
- Steam boiler model CRP with gas turbine or engine from one-step gas burner incorporating a linear air stream, thereby increasing its production, offering a post-combustion efficiency of 100% on natural gas PCI.
The recovery generators designed like this allow the transportation of large amounts of gases generating large amounts of steam up to 50 t/h and maximum working pressures of 30 bar.