FI68899C - ROSTKONSTRUKTION - Google Patents

Description

ARINARAKENNE 6 8899

Separated from application 801489 (patent 65,855).

The invention relates to a grate structure suitable for grates for fireplaces, boilers and similar fireplaces using solid fuel.

The purpose of the grate is to implement an efficient air circulation 10 and thus to add air to the solid fuel combustion process in order to achieve the best possible combustion result.

It is known that a good combustion result is achieved by the so-called 15 by reverse combustion, in which the flue gases are recirculated to the fuel bed. This procedure is used in grate equipment that has been continuously reciprocated during the combustion process.

20 The disadvantage of the known grate structures is e.g. the fact that the ash formed on the grate may melt and block the air ducts of the grate, thus blocking the flow of air through the grate. It should also be noted that as air flows through the grate from the bottom up, as the colder air layer and smoke-25 gases mix, a combustion process characterizes the formation of a solid ceramic combustion product, slag, in the grate structure. This combustion product corrodes the grate structure and clogs its air ducts, thus preventing air circulation through the fuel bed during the combustion process 30.

The disadvantage of grate structures used in heating boilers for burning peat, wood chips or peat pellets of various qualities is generally that the combustible material falls unburned through the grate into the ash, thereby reducing the power of the boiler and interfering with its operation. In such a boiler, after refueling, 2 63899 parts of the combustion gases pass through the gasification stage unburned to the convection part, whereby the pitch and soot adhering to the combustion gases reduced the efficiency of the boiler.

The object of the invention is to provide e.g. a grate structure that can be used to remove the epS points shown above. TSm3 is implemented by means of the characteristic features of the invention set out in the appended claims.

The grate structure according to the invention provides a decisive improvement in the process of burning solid fuel. Thanks to the grate structure, the air circulates in such a way that the fuel can be used as accurately as possible. The flue gases can be conducted in a direction deviating from the vertical direction of the fuel layer Lipi 15 so that they form a mixed gas in the air, which is brought into the assemblies in an optimal manner.

Especially in the combustion chambers of peat, wood chips and different types of peat pellets-20 teji firing boilers, the grate structure significantly improves the combustion result. The burning ingredient does not hiss too early in the grate Lipi, but the combustion takes place in layers. Ash settling can not be delayed by suitable dimensions at different levels.

25

In the following, the invention was explained in detail with the aid of the accompanying drawings, in which

Figure 1 shows a part of a grate showing a grate structure according to the invention; Fig. 2 shows a section A-A of the grate structure of Fig. 1.

Each individual element of the grate structure according to the invention is formed plate-like from a metal body wound around its longitudinal axis.

35 5 68899

The grate is constructed from a plurality of parallel grate elements 1, 2, 3 so that the horizontal points 4, 5, 6 form suitable pockets 7.

The grate based on the grate structure according to the invention operates in such a way that a solid fuel, such as coal, settles in the above-mentioned pockets. In this case, the combustion air surrounds each small batch of fuel on all sides, resulting in efficient and complete combustion.

10

The invention has been described above with reference to only one preferred embodiment thereof, but it is clear that the invention can be modified in many ways within the scope of the appended claims.

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