Hybrid duct device for heating an air flow
AssigneeFives Itas S.P.A.
InventorsFabio Antonio QUADRI, Louis Roland Francis RICCI
Life of this patent
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Abstract
A hybrid device for heating an air flow, with duct, provided with a main direction and characterized by the presence of an electric heater for the preheating of the process air, with a gas burner for the completion of the heating of the process air and with a control system for the management of the parameters of interest and for the optimization of the process.
Claims10
A duct heating device for process air flow, comprising a casing, which delimits a duct provided with a main direction, an electric heater, a gas burner, wherein the casing has a first end, arranged in an inlet zone, and a second end, arranged in an outlet zone of the heated gas, and wherein the casing, has a critical length measured parallel to the main direction-as a distance between the ends, wherein, inside the duct, the electric heater is located upstream of the burner with respect to the air flow and adjacent to the burner.
A method for converting a gas heating device having a critical length and a total heating power into a hybrid heating device which maintains substantially the same total heating power and the same critical length, wherein:
- the gas heating device comprises a casing, delimiting a duct (provided with a main direction, a gas burner comprising a number of combustion modules having a nominal heating power;
- wherein the casing has a first end, arranged in an inlet zone, and a second end, arranged in an outlet zone of the heated gas, and wherein the casing has a critical length measured parallel to the main direction as a distance between the ends;
- method comprising the following steps:
- defining a heating power of an electric heater such that the sum between said heating power and said nominal heating power is equal to said total heating power;
- reducing the nominal heating power of the burner modules by approximately (Pe/P)⅔;
- increasing the number of burner modules by 1/(1-(Pe/P)⅔).
Dependencies are inferred from the claim text.