Reciprocating mechanical fire grate with improved combustion stabilization capability under layered combustion down-firing mode

Abstract

The invention belongs to the field of raw coal combustion equipment and provides a reciprocating mechanical fire grate with improved combustion stabilization capability under a layered combustion down-firing mode. The reciprocating mechanical fire grate comprises an upper fixed fire grate segment (3), an upper movable fire grate segment (4), a lower movable fire grate segment (5) and a lower fixed fire grate segment (6) which are arranged in a step shape from top to bottom, wherein the upper movable fire grate segment (4) and the lower movable fire grate segment (5) reciprocate by virtue of a driving device; the reciprocating speed and stroke of the upper movable fire grate segment (4) are less than those of the lower movable fire grate segment (5); the end part of one side, facing toward the fuel moving direction, of the upper movable fire grate segment (4) is not overlapped with the end part of one side, facing toward the fuel moving direction, of the lower movable fire grate segment (5). According to the reciprocating mechanical fire grate, a mode that the movement of reciprocating fire grates and movable fire grate segments is progressively increased is adopted, so that stable combustion of combusted coal at the initial stage of firing is ensured, flameout does not occurs, and heat load of combustion is ensured.

Description

technical field [0001] The invention belongs to the field of raw coal combustion equipment, and in particular relates to a reciprocating mechanical fire grate which improves the stable combustion capability of the ignition mode under layered combustion. Background technique [0002] In view of the uncontrollable NOx emissions produced by the combustion of traditional mechanical grate furnaces in my country, various decoupling combustion devices have been developed with earlier patented technologies, mainly by decomposing the combustion process of coal into two stages: pyrolysis gasification and semi-coke combustion , the pyrolysis gas can achieve smokeless combustion while reducing NOx emissions through semi-coke layer combustion. But these patented technologies are only applicable to small coal-fired boilers with smaller capacity. In order to achieve low NOx combustion on larger capacity boilers, the patent (China Invention Patent No.: ZL01131238.6) proposes to install a pr...

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Problems solved by technology

However, the height of the pre-combustion chamber grate and pre-combustion chamber in this patent is relatively large, and the structure is relatively complicated, which brings great inconvenience to installation, maintenance and coal addition operations, and the higher pre-combustion chamber is easy to form a "chimney effect". ", to increase the amount of smoke leakage from the coal hopper and the furnace door; moreover, the grate structure of this patent is not capable of stabilizing combustion when burning low-quality coal, which will easily cause the delay of ignition and reduce the effect of decoupling combustion

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