SE450286B - Dual fuel boiler - Google Patents

Abstract

The boiler uses solid fuel only, or a combination of solid fuel and oil. With solid fuel the combustion direction is reversed. A fuel bunker is accommodated in a space in the boiler, having a grate at the bottom and being sealed off gastight from the flues. The flues run around the space to a separate chimney. When running on oil, the combustion gases are discharged via a separate flue.

Description

The present invention has been practically designed in such a way that a closed fuel magazine is substantially concentrically arranged in a larger cavity limited by the water-cooled inner walls of the boiler. The fresh air is introduced through the upper fire hatch and the combustion takes place through the rust in the bottom of the magazine.

From the rest, the gases are led around between the walls of the boiler and the magazine over to a part intended for oil heating and out through a separate flue gas duct for solid fuels. In the event of an oil fire, the said flue gas duct is closed by shifting a flue gas valve so that the gases are forced to take the opposite path to that of solid fuel and out through the flue gas duct for oil. This results in a maximum fire surface at both fuel alternatives.

The invention will be described in more detail below with reference to the accompanying figures, in which Pig. 1 shows a longitudinal section through a boiler according to the invention.

Fig. 2 shows a section through the part of the boiler intended for solid fuels »Fig. 3 shows a section through the part of the boiler intended for oil heating.

Skewed section lines mark water filling.

By Pig. 1 and 2 show the embodiment of the fuel magazine (1). It is suitable that the magazine (1) is arranged symmetrically in the cavity (2) so that unnecessary throttling of the passage of the gases between the walls is avoided. The magazine (1) is welded to the water walls in the front and rear edges, so that a good heat dissipation from the heated plates in the magazine walls is obtained. The flame part below the rest (4) is by means of a wall separated from the passage out to the fireplace (8) for oil heating. This forces the hot gases to take the passage clockwise around the reservoir (1). To protect the sheet material in the hot zone, the surfaces are coated with refractory ceramic material (9). Inside the reservoir door (3) there is a tight-fitting sooting hatch (10), which enables sweeping of the space between water walls and the reservoir (1). An ash hatch (11) provides access under the grate.

Inside the door v11) there is a tateiutanae etrålninge-ocn varmeskyaa (12).

When firing with solid fuel, the hot gases pass around the magazine (1) via the passage (14) into the fireplace (13), and further out through the chimney duct (5). mv ~

Claims (1)

1. 450 286 A duct changer (6) is adjustable in alternating end positions for solid fuel resp. oil and is so blocked that intermediate positions cannot be obtained. In the case of oil heating, the flue gases go the reverse way from (ïö) and counterclockwise around the reservoir (1) to the chimney duct (7). PATENTKRAY Boiler with two separate combustion chambers for the combustion of solid fuels and oil, in which the combustion chambers are surrounded by a water-filled jacket and are each equipped with a flue gas duct (5,7) leading to the chimney, the combustion chamber for solid fuels (2) being provided with a separate fuel magazine (1) in the lower part of which there is a grate (4), on which the combustion takes place during the supply of combustion air from above, characterized in that the combustion chambers (2,8) are connected by a connecting duct (14) and that means (6) is present for closing either of the flue gas ducts (5,7) in such a way that the flue gases are forced to pass through the connecting duct (14) to the other combustion chamber and via its flue gas duct to the chimney during firing in one combustion chamber.