Method for mechanical stoking in firing installations and firing installation

Abstract

A method for mechanical stoking in firing installations and a firing installation is provided. Fuel is applied to a grate using a mechanical stoker, the grate being disposed in a firing chamber, wherein the mechanical stoker is oriented opposite a delivery direction of the grate. The fuel is introduced directly below a firing chamber ceiling, viewed in the delivery direction of the grate before the end of the grate such that a burnout zone, which does not have fresh fuel applied thereto, is created on the grate between the mechanical stoker and the end of the grate.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is the US National Stage of International Application No. PCT / EP2009 / 051623 filed Feb. 12, 2009, and claims the benefit thereof. The International Application claims the benefit of German Application No. 10 2008 010 235.0 DE filed Feb. 21, 2008. All of the applications are incorporated by reference herein in their entirety.FIELD OF INVENTION[0002]The invention relates to a method for mechanical stoking in firing plants in which fuel is deposited by means of a mechanical spreader stoker onto a grate which is disposed in the combustion chamber, wherein the direction of throw is oriented opposite to the conveying direction of the grate, as well as to a corresponding firing plant.BACKGROUND OF INVENTION[0003]The invention can be used in firing plants employing 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 ...

AI Technical Summary

Benefits of technology

[0009]By virtue of the fact that the mechanical spreader stoker is offset from the end of the grate in the direction of the trajectory it is no longer possible for fresh fuel to reach the last section of the grate before the discharge, but instead only the fuel already in the process of combustion is burned completely. As a result a more complete combustion of the fuel is achieved, thereby bringing about a reduction in the residual carbon content of the ash.

[0010]By virtue of the fact that in addition the mechanical spreader stoker is disposed at a higher level a greater length of trajectory can be achieved at the same rotational speed of the thrower wheel or, alternatively, if the length of trajectory remains the same, the rotational speed of the thrower wheel can be reduced.

Problems solved by technology

The arrangement of the mechanical spreader stoker over the end of the grate has the disadvantage that fresh fuel also lands on the grate close to the end of the grate and so is no longer able to burn completely before being discharged.

This means that it may not be possible to comply with provisions governing the maximum permissible residual carbon content of the ash.

Images