Patent EA-001328-B1 (EA)
Title: Method and device for the combustion of liquid fuel
Inventor: DURST FRANZ
IPC: F23D11/44
Filed: 1997-11-10
Abstract: 1. Process for the combustion of liquid fuel (F), in particular oil, wherein the liquid fuel (F) is distributed by means of a distribution device (1) and is transferred into a reactor arranged downstream with a porous medium (6) having a communicative pore space, the Peclet number of which porous medium permitting flame development and complete combustion of the liquid fuel (F) within the porous medium (6), characterized in that a device containing a porous body (3) is provided for the evaporation of a mixture consisting of the liquid fuel and a gaseous oxidant, the device being arranged upstream of the porous medium (6) and downstream of the distribution device (1). 2. Process according to claim 1, wherein a gaseous oxidant (L), in particular air, is supplied to the distribution device (1) and/or the porous medium (6) to form a mixture consisting of the liquid fuel (F) and the oxidant (L). 3. Process according to claims 1 or 2, wherein a gaseous oxidant (L), and/or liquid fuel (F) and/or evaporation device are heated by means of a heating device. 4. Process according to claim 3, wherein the heating power of the heating device is obtained from the enthalpy of the combustion gases. 5. Process according to one of the preceding claims, wherein the mixture is ignited by means of an ignition appliance (7) provided in the porous medium (6) or in the evaporation device or in the vicinity of the distribution device (1). 6. Appliance for the combustion of liquid fuel, in particular oil, according to claims 1 to 5, wherein comprising a distribution device (1) and a reactor arranged downstream with a porous medium (6) having a communicative pore space, the Peclet number of which porous medium permitting flame development and complete combustion of the liquid fuel (F) within the porous medium (6), characterized in that a device containing a porous body (3) is provided for the evaporation of a mixture consisting of the liquid fuel (F) and a gaseous oxidant, the device being arranged upstream of the porous medium (6) and downstream of the distribution device (1). 7. Appliance according to claim 6, wherein the Peclet number of the porous medium (6) is greater than 65. 8. Appliance according to claim 6 or 7, wherein the distribution device (1) and/or the porous medium (6) has a supply arrangement for a gaseous oxidant, in particular air, to form a mixture consisting of the liquid fuel (F) and the oxidant (L). 9. Appliance according to one of claims 6 to 8, wherein the distribution device (1) has a device for atomizing the liquid fuel (F). 10. Appliance according to one of claims 6 to 9, wherein the atomizing device has a nozzle (11) to which can be supplied liquid fuel (F) under pressure. 11. Appliance according to one of claims 6 or 10, wherein the atomizing device has a binary nozzle (17) to which can be supplied liquid fuel (F) and oxidant (L) under pressure. 12. Appliance according to one of claims 6 to 11, wherein the atomizing device is arranged in the vicinity of the porous medium (6). 13. Appliance according to one of claims 6 to 12, wherein the porous medium (6) is provided, at its mixture inlet end (15), with a porous element (5) having a communicative pore space. 14. Appliance according to one of claims 6 to 13, wherein the pore space of the porous element (5) has a Peclet number which does not permit flame development. 15. Appliance according to one of claims 6 to 14, wherein the Peclet number of the porous element (5) is less than 65. 16. Appliance according to one of claims 6 to 15, wherein the porous body (3) can be heated by the thermal radiation formed in the porous medium (6). 17. Appliance according to one of claims 6 to 16, wherein the porous body (3) has a communicative pore space whose average pore diameter is preferably greater than that of the porous element (5). 18. Appliance according to one of claims 6 to 17, wherein the porous medium (6) is in contact with the porous element (5). 19. Appliance according to one of claims 6 to 18, wherein the porous element (5) is in contact with the porous body (6). 20. Appliance according to one of claims 6 to 19, wherein the distribution device (1) has means for generating liquid jets (2). 21. Appliance according to one of claims 6 to 20, wherein the atomizing device (11) and/or the means for generating liquid jets (2) protrude into a recess (4) provided in the porous element (5) or porous body (3). 22. Appliance according to one of claims 6 to 21, wherein a heating device is provided to heat the oxidant (L) and/or the liquid fuel (F) and/or the evaporation device. 23. Appliance according to claim 22, wherein the heating device can be heated by the enthalpy of the combustion gases. 24. Appliance according to one of claims 6 to 23, wherein an ignition appliance (7) for igniting the mixture is provided in the porous medium (6) or in the evaporation device or in the vicinity of the distribution device (1). 25. Appliance according to one of claims 6 to 24, wherein the reactor has a casing (14) accommodating the porous medium (6). 26. Appliance according to one of claims 6 to 25, wherein the casing (14) surrounds tree porous element (5) and the evaporation device. 27. Appliance according to one of claims 6 to 26, wherein a macroporous element (13) with a heat exchanger (12) embedded within it is provided downstream of the porous medium (6). 28. Appliance according to one of claims 6 to 27, wherein the porous medium (6) is arranged below the distribution device (1) so that a counterflow occurring on combustion is directed against the mass flow.