Thrower wheel of a mechanical stoker

Abstract

A thrower wheel of a mechanical stoker is provided. The thrower wheel includes a plurality of blades, which are disposed on a base plate. A height of the blades increases in a radial direction in at least one area and optionally remains the same in one or more remaining areas, and the height of the blades is less at the inner end of the blades than at the outer end of the blades.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the U.S. National Stage of International Application No. PCT / EP2009 / 051619 filed Feb. 12, 2009, and claims the benefit thereof. The International Application claims the benefits of German Application No. 10 2008 009 683.0 DE filed Feb. 18, 2008. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention relates to a thrower wheel of a spreader stoker having a plurality of blades disposed on a base plate as well as to a corresponding spreader stoker.BACKGROUND OF INVENTION[0003]The invention can be used in firing plants having thrower wheel mechanical stoking. In said applications the solid, particulate fuel is introduced into the combustion chamber with the aid of the thrower wheel disposed in a spreader stoker. The trajectory length can be adjusted by varying the rotational speed of the thrower wheel.[0004]Generally the thrower wheel is in this case arranged ho...

AI Technical Summary

Benefits of technology

[0016]Needless to say, the effect of the invention can be increased if the blades are moved away from the region of the hub of the base plate, since the fuel is, of course, usually supplied concentrically to the hub. In this regard it can be provided that the inner ends of the blades have a clearance relative to the hub of the base plate.

[0017]Apart from the height of the blades, the arrangement and shape of the blades can be varied according to requirements: the blades can be straight or curved; they can run radially outward from the hub, they can be arranged tangentially relative to the hub or they can touch the hub neither directly nor indirectly (via an imaginary extension). The blades can directly adjoin the hub or indeed start only at a distance from the hub.

[0018]Usually, however, the blades will always extend as far as the rim of the base plate and are fixedly joined to the base plate along the entire length of the bottom edge.

[0019]The number of blades also depends on the type of fuel and fuel quantity. Two, four or six blades are common.

[0020]If the inventive thrower wheel is installed in a spreader stoker, then the latter comprises at least one housing having at least one feed opening for fuel and at least one ejection opening for fuel.

[0021]In this case a feed opening for fuel is indeed beneficially provided which is concentric to the axis of rotation of the thrower wheel, such that fuel can be applied onto the thrower wheel in the direction of the axis of rotation.

Problems solved by technology

Depending on the type of fuel, however, the thrower wheel rotating at high speed is subjected to a high rate of wear.

This results in high losses during transfer of the kinetic energy of the thrower wheel onto the fuel, which transfer is associated with a high rate of wear of the blades of the thrower wheel.

However, this means that the trajectory length for the fuel is limited and possibly the optimal fuel distribution in the combustion chamber will not be reached.

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