DE8517925U1 - Moving grate for combustion chambers for burning solid or pasty fuels - Google Patents

Abstract

1. A feed grating for combustion chambers for the firing of solid or pasty fuels, characterized in that to form a closed grating plane impermeable to fuel and ash, a plurality of plates (1-5) lying substantially horizontally in a row are superposed one above the other staircase-fashion, the top plate being disposed at the filling side end of the combustion chamber (6) ; the odd plates (1, 3, 5) in the row and the even plates (2, 4) each being combined with one another to form a pack, the plates of both packs being offset in the direction of the row by the same horizontal amount between their front edges ; at least one of the packs is mounted to be displaced in the direction of the row and is coupled to a controllable driving device (10 ; 12) whose travel can be varied, the two packs being displaceable in relation to one another as far as the horizontal amount of offsetting of the plate front edges ; and the plates of at least one of the packs consist of hollow boxes (13, 15) which are connected to an air supply line (9 ; 11) and whose upper walls (13) are formed with a plurality of small, nozzle-like air discharge holes (14) distributed over the box surface.

Description

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Hoval Interliz AG, Vaduz / Liechtenstein

Moving grate for combustion chambers to increase the price of solid or pasty ones Fuels

For large combustion systems such as steam boilers from power plants, pusher and piling grates are known in which grate plates are arranged in an inclined grate path the slope of which is slightly less than the angle of repose of the respective type of solid fuel, and in which the grate plates generally perform a reciprocating movement through which the grate path extends undulating to the fuel layer over to move the inclined grate track downwards. The combustion air is introduced below the grate path and let through the grate plates into the fuel layer. For e.g. lignite, which decays when burned, grate plates are used, which are between Their stair-like overlapping plate edges form horizontal channels and only through these the combustion air let through into the fuel layer.

The invention is based on the object for combustion chambers of such boiler-like combustion devices, the more on the type and size of conventional boilers for hot water heating systems of buildings and for those for ash removal

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deir can be fired with various types of solid fuels Combustion chamber structurally and for reasons of space, the training and application of large combustion systems Conventional sliding and scraping grates is not possible to create a moving grate that also works with horizontal movement of the fuel layer effectively and reliably moves the fire or ash bed further and discharging the combustion residues from the combustion chamber which prevents falling through Avoids fuel or ash through the grate track and thus additional facilities under the grate track makes it unnecessary to remove any residue that has fallen through, but on the other hand makes the combustion air over a large area distributed over the grate surface in the fuel layer.

This object is achieved according to the invention by what is contained in the characterizing part of main claim 1 Features solved. The formation of the invention The moving grate as well as its mode of operation and advantages are shown below with reference to the illustration in the drawing Embodiment described in more detail. Show in the drawing

Figure 1 and Figure 2 in a schematic representation of a side view of the moving grate in two different Movement positions,

Figure 3 shows a detail of the moving grate in an enlarged view.

The moving grate moving at the bottom of a combustion chamber 6 with filling opening 7 and ash removal opening 8 consists of several horizontal plates 1 - 5, which are arranged in a row like a staircase overlay, with the top plate 1 on which the

The end of the combustion chamber 6 containing the filling opening 7 and which form a closed grate that is impermeable to fuel and ash. Plates 1-5 can be moved horizontally in lateral guides. The in the order odd plates 1,3 and 5 as well as the straight plates 2, 4 are each connected to one another to form a package. Here are the plates 1, 3, 5 as well the plates 2, 4 in the row direction around the same Horizontal dimension offset between their front edges. The two packages can be moved relative to one another, and up to the horizontal dimension of the offset of the front edges of the panel, so that, for example, the panel 1 from the position ' 1 moves forward on the plate 2 up to the position of FIG Move the lying fire or ash bed up to plate 3. When the panels return from the position 2 in the position of Figure 1, the plate 2 pushes the fire or ash bed lying on the plate 3 on to plate 4. This relative displacement of the two plate packs against one another can be achieved by the Only one of the two packages can be shifted, the stroke of which then corresponds to the entire horizontal dimension of the shift would have to correspond to the front edge of the plate. To shorten the overall length of the moving grate, it is more advantageous to according to the illustrated embodiment, both .Plattepakete to be slidable, the stroke each panel package then only corresponds to half the horizontal dimension of the offset of the panel front edges needs. In the illustrated embodiment, the package with the odd plates is 1,3,5 through a linkage 9 with a controllable drive device 10 and the package with the straight plates 2, 4 through a Linkage 11 with a controllable drive device coupled. The stroke size of the drive devices 10 and 12 or the coupled plate packs is different

changeable, so that any smaller strokes of the plates packages can be set as the horizontal dimension of the offset of the panel leading edges.

The combustion air is fed into the fuel layer in that the plates consist of at least one of the packages of hollow boxes which are connected to an air supply line and are provided on their upper hollow box wall 13 with a large number of small, nozzle-like air outlet holes 14 distributed over the box surface ( Figure 3). If, for example, the straight plates 2 and 4 are designed as hollow boxes, the amount of air blown from them into the fuel layer can be regulated in that the odd plates 1 and 3 are pushed more or less out of the position in FIG. 1 and the surface of the hollow box plates 2, 4 cover. Advantageously, according to the illustrated embodiment, the plates of both packages are designed as hollow boxes. Here , the rods 9 and 11 can be designed in a simple manner as hollow rods for the air supply into the hollow box panels of both packages. If the panels of both packages consist of hollow boxes for the supply of the combustion air: the volume regulation of the air exiting the straight 'hollow box panels 2, 4 can be done by means of the variable cover by means of the hollow box panels 1, 3 and with this overlap the volume can then be regulated from the uneven box girder plates 1, 3, 5 escaping air in that in their air ' supply or hollow rods 9, a common, not shown air flap is arranged.

The formation of the panels consisting of hollow boxes with a large number of panels distributed over the panel surface fine air outlet nozzles causes a fine and even

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moderate distribution of those injected into the fuel layer Air. By slowly moving the box girder slabs of one or the other package by less than

i the horizontal dimension of the offset of the front edge of the panel ^!

the fine air jets emerging from the nozzle holes are shifted from one entry point into the ember bed to: another entry point, so that the large number of fine air jets emerging from the hollow box slabs upwards and their displaceability compared to the ember bed results in an even ember bed combustion. Even when designed as hollow boxes, the plates form a grate level that is completely closed at the bottom, so that separate, additional devices under the moving grate for removing quantities of fuel or ash that have fallen through are unnecessary. The blowing out of the combustion air from the hollow boxes in a large number of fine air jets with the help of a large number of fine nozzle holes on the one hand causes intensive cooling, in particular also of the upper wall 13 de * hollow boxes, which can thereby be produced from conventional cast material for fire grates, and on the other hand prevents Fuel dust or ash dust can fall through the nozzle holes into the hollow box against the flow speed of the fine air jets emerging from the nozzle holes. As shown in FIG. 3, the box girders can expediently consist of a lower part 15 with converging hollow rods 11 or 9 and a detachably attached upper box girder wall 13 so that the box girders can be lifted up by lifting the top wall ^:

Λ 3 can be opened to remove any solid particles that may have fallen in.

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Claims (5)

«· · ■ ·· · ■ atf · It» · Claims for protection 1. Moving grate for combustion chambers for combustion solid or pasty fuels, characterized in that to form a closed, for fuel and ash impermeable grate level several lying essentially horizontally in a row Plates (1 - 5) overlap in a step-like manner, with the top plate at the end of the filling side Combustion chamber (6) is located that in the order odd plates (1, 3, 5) and the even Plates (2, 4) are connected to one another to form a package, the plates of both packages in the series are offset by the same horizontal dimension between their leading edges that at least one of the Packages is slidably mounted in the row and with: a controllable drive device (10 or 12), the stroke size of which can be changed, is coupled, with the two packages up to the horizontal dimension the displacement of the plate leading edges are relatively mutually displaceable, and that the plates at least one of the packages of hollow boxes (13, 15) exist, which are connected to an air supply line (9 or 11) and on their upper hollow box wall (13) with a variety of over the box surface distributed small, nozzle-like air vent holes (14) are provided. j 2. moving grate according to claim 1, characterized in that 'that both plate packs with a controllable drive device (10 or 12) are coupled and displaceable in the series, with each package Up to half the horizontal dimension of the offset of the front edges of the panels in the row alignment is, and that the plates of both packages consist of hollow boxes (13/15). 3. moving grate according to claim 1 or 2, characterized in that that the panels belonging to a package, consisting of hollow boxes, with the drive device are connected by a linkage, which is at the same time designed as an air-supplying hollow linkage. 4. Moving grate according to one of claims 1-3, characterized characterized in that the hollow boxes consist of a lower part (15) with an attached air supply line urr ". a j detachably placed on the lower part, the nozzle ι holes (14) containing the upper air blowout Hollow box wall (13) exist. 5. Moving grate according to claim 2, characterized in that > that in the common air supply line (9) to the hollow boxes (1, 3, 5) of a plate pack there is a rule: flap is arranged and the amount of air escaping from the hollow boxes (2, 4) of the other panel package through Covering the nozzle holes (14) of these hollow boxes (2, 4) by means of the layered overlay with variable overlap, benen hollow boxes (1, 3, 5) of the former panel package is adjustable.