FI109723B - Burning device for burning so-called pellets used in combustion furnaces - Google Patents

Abstract

The device includes a barrel-like component (4), in which the pellets or similar fuel are placed. The device also includes a second, bottomless and coverless barrel component (2) fitting inside the barrel-like component and supported on the upper surface of the pellets (7), in such a way, that both components have holes in their jacket surfaces. The compositions are cylindrical and fit telescopically inside each other. The lower component pref. has a perforated grate component (5), in a position raised above the lower edge of the component.

Description

1 109723

This invention relates to a firing means, and more particularly to a firing line which makes it possible to burn wood pellets in particular.

Today, wood pellets are burned to a relatively large extent because of their high calorific value and ease of handling. The pellet is a particle-shaped wood raw material which has been mechanically compressed to a certain hardness and dimensions.

However, pellets are often fired in many types of furnaces and boiler plants under unsatisfactory conditions, in that the uniformity of combustion and optimal conditions for combustion are often not achieved.

If pellets are burned in installations with fans and feeders and the like, the plant will easily become very expensive and complex and will not be suitable for use on a small scale, such as a conventional furnace or even without an oven. Under such conditions, the disadvantages of combustion are emphasized in non-optimal conditions.

It is an object of the present invention to provide a combustion medium which is particularly suitable. # well used for burning wood pellets and which can be used in conventional furnaces or combustion is made to occur vigorously and at least under nearly optimum conditions in all conceivable conceivable combustion media according to the invention.

These and other advantages and advantages of the present invention are achieved as set forth in the appended claims.

»• | '': A preferred embodiment of the invention will be described in the following in the following 30 minutes, without being limited thereto, with reference to the accompanying principal drawing. which represents the device in a vertical sectional view.

I I · • · t • »

The device according to the invention simply consists of two nested cylinders which are telescopically movable relative to each other, of which 2,109,723 are hereinafter referred to as upper cylinder 2 and lower cylinder 4. The upper cylinder 2 is slightly smaller than the lower cylinder 4 and is thus inner of the cylinders. The cylinders are particularly circular in cross-section, but by no means necessarily, although a circular cylinder has clear advantages in this construction.

5

The lower cylinder 4 is of torn sheet metal or, in any case, of fire-resistant material. The top cylinder 2 has holes only at the bottom of the diaper surface, otherwise the diaper surface is unpunched. The holes in the lower part of the upper cylinder 2 may be clearly larger than the holes in the lower cylinder. The upper cylinder is also made of fire resistant material. The purpose of the perforation 10 is to allow air to flow into the interior of the cylinders and direct the airflow to the combustion surface. By making the holes in the upper cylinder larger than those in the lower cylinder, air is available under all conditions. Air is specifically needed to maintain combustion.

The lower cylinder 4 is preferably provided with a grate 5 which is supported in a position slightly upwards from the bottom of the lower cylinder, for example suitable studs 6, as shown in the figure. There are a suitable number, for example at least three. The grate 5 is also perforated, whereby the ash from combustion is allowed to drain from the holes to the space below the grate 5. Reference numeral 7 denotes 20 wood pellets.

Set up and use the instrument as follows. The lower cylinder 4 is suitably filled with wood pellets 7, for example almost completely. Preferably, the grate 5 is attached to the bottom of the cylinder 4. The upper cylinder 2 is inserted into the lower cylinder 4 ·: · * 25. In the figure, the upper cylinder 2 is not very much inside the lower cylinder 4, since the combustion event is only beginning there. The lower edge of the upper cylinder rests on the pellets. The lower edge may include some fold if desired, but usually no such fold is required to perform the function.

»: Y: 30 The perforations of the cylinders are such that they pass through the overlapping portions of the cylinders: always open holes, through which combustion air enters, marked with arrow 3. The pellets are ignited from the surface in a suitable manner, for example by using» *. . with suitable ignition fluid, which makes it easy to carry out the ignition evenly throughout the * · area. Because the device produces a certain chimney effect, combustion feeds good airflow and thus good combustion. As the combustion progresses and the upper edge of the pellet charge decreases, the supporting cylinder barrel is automatically lowered, thereby automatically and uniformly lowering the combustion surface while the conditions of the combustion event itself remain substantially constant.

In practical tests, the combustion has been found to be uniform and complete.

It is possible, for example, to use the device according to the invention inside the furnace 10 instead of loading logs or the like into the furnace. The device may be used directly placed on a conventional grate or by using a suitable grate with a recess. The device according to the invention is also suitable as a heat source of the type for a camping stove, since there are no limits to the dimensions of the device, it can be made to a very small size or, if desired, quite large. Outside 15, it can be used as a "candlestick" light source to decorate a party, for example.

It will be appreciated that in addition to size variation, the material of manufacture of the device and its shape may vary within very wide limits. Cheap versions of it can be made using inexpensive raw materials for its manufacture, or if very durable materials are used or, for example, materials with a beautiful appearance, the possibilities for variation are greatly increased.

Other modifications which remain within the scope defined by the inventive basic idea and the appended claims are also contemplated.

• · · * · * · * · · »i» 1 * · · • »i» 1 * · · • «» • t {t (I · · * · «

I I

I I

• I

t »I

Claims (8)

1. Combustion device for combustion of special so-called. pellets, the combustion device comprising a vessel-like part (4) for placement of the pellets 5 or the like therein, characterized in that it further comprises a second, bottom and lidless vessel part (2) which is placed inside the vessel-like part (4) and which supports the upper surface of the pellets (7), wherein both the portion (4) and the portion (2) comprise shark in its mantle surface. 10 Combustion device according to claim 1, characterized in that the parts (2, 4) are cylindrical and telescopically slidable into each other. Combustion device according to Claim 1 or 2, characterized in that the lower part (4) comprises a raised part (5) in a raised position with respect to the lower edge of the part (4). • · The combustion device according to claim 1, characterized in that substantially: v the entire casing surface of the part (4) is slotted but the part (2) comprises only in the vicinity of the lower edge. 20> # · t · * * 5. Combustion device according to claim 1, characterized in that the heel of the <<* * ·· * casing surfaces of the parts (2, 4) is of such type and is so close that in the vicinity of the pellet kit, open shark is always open for introduction of combustion air. (3) in the combustion device. ; · '25 Combustion device according to claim 5, characterized in that the heel in the upper part (2) is substantially larger than the heel in the lower part (4). . 'I Combustion device according to any one of the preceding claims, characterized in that it is a circular cylinder in section. Combustion device according to any of the preceding claims, characterized in that the parts (2, 4) are of metal plate.