COMBUSTION BOILER

Abstract

A combustion boiler includes a liquid tank in which one or more combustion chambers and a series of flue gas pipes are submerged, such that the chambers are above the pipes, the final flue gas outlet being at the lowest point. The inlet of cold liquid to the tank is lower and the outlet of vapour or hot liquid is higher.

Claims

1.-3. canceled

4. A combustion boiler comprises: at least one combustion chamber; a plurality of flue gas pipes; and a liquid-holding tank with an outlet for vapour or hot liquid and an inlet for cold liquid; wherein the at least one combustion chamber and the plurality of flue gas pipes are submerged in a liquid disposed in the liquid-holding tank; wherein the at least one combustion chamber is above the plurality of flue gas pipes; wherein the inlet is at a lower point of the liquid-holding tank; and wherein the outlet is at an upper point of the tank.

5. The combustion boiler according to claim 4, wherein the at least one combustion chamber is between one and five combustion chambers.

6. The boiler according to claim 4, wherein the flue gas outlet is at the lowest point of the plurality of flue gas pipes.

Description

DESCRIPTION OF THE DRAWINGS

[0022] For a better understanding of the invention, the following figures are included, showing particular embodiments.

[0023] FIG. 1 represents a schematic cross-section of a first exemplary embodiment in a first direction.

[0024] FIG. 2 represents a schematic cross-section of a second exemplary embodiment according to a second direction, perpendicular to the first, marking the path of the liquid as it heats up and of the flue gas as it leaves the combustion chamber.

EMBODIMENTS OF THE INVENTION

[0025] An embodiment of the invention is briefly described below, as an illustrative and non-limiting example thereof.

[0026] The example shown in the figures corresponds to a vapour generating boiler. It comprises a boiler with one or more combustion chambers (1), a series of flue gas pipes (2) and a tank (3) for water or liquid to be heated that has an upper outlet (4) of vapour or hot water and a lower inlet (5) of new water or from the condenser.

[0027] It can be seen that the chambers (1) are horizontal, with a front fuel inlet (of any type: liquid, solid, gas . . . for example, wood pellets or organic waste) and a rear outlet of flue gas. The pipes (2) are arranged below the chamber (1). The natural draft of the gases or produced by the burners will serve to ensure the conveyance in the desired direction. However, it is possible to add a gas compressor or exhaust fan (not shown). These pipes (2) are preferably arranged as a coil, with the final outlet at the lowest point.

[0028] The set of chambers (1) and pipes (2) is inserted inside the tank (3), so that its entire lateral surface is in contact with the water. The level of the water is controlled by any known means to ensure that this heat exchange occurs and the temperature of the wall does not raise too high.

[0029] The use of several chambers (1) instead of just one makes it possible to increase the contact surface with smaller chambers (1), such that it allows to increase the travel of the pipes (2) inside the tank (3). An optimal solution is between 1 and 5 chambers (1). FIG. 2 shows several pipes (2), marking in dashed lines the gas circuits of the central boiler to avoid confusion. The distribution of the pipes (2) by the tank (3) will be calculated so that the temperature gradient is the most suitable and reduces any eventual unwanted convection current. FIG. 2 shows a solution with three chambers (1), the one in the centre and its pipes (2) in dashed lines, and indicating the temperature gradient on the right.

[0030] This solution allows, in one example, to use a boiler with 200 litres of water and raise the temperature to 150° C. in six minutes, with a flue gas outlet at 15° C.