A boiler with controllable tangential combustion

Abstract

The invention provides a boiler with a controllable combustion tangent circle. The boiler comprises a hearth which is encircled by a plurality of walls, wherein the hearth comprises a main combustion area and a burnout area; the main combustion area and the burnout area are respectively provided with combustors which are connected with nozzles through pipelines; a plurality of corner-type primary air nozzles and corner-type secondary air nozzles which are vertically arrayed are respectively arranged at the corners of the adjacent walls of the main combustion area; a plurality of wall-type secondary air nozzles which are vertically arrayed are respectively arranged at the secondary air equal-height positions of all the walls of the main combustion area; each nozzle faces the interior of the boiler, and the jet flow direction can be adjusted. When the boiler with the corner-type secondary air nozzles and the wall-type secondary air nozzles works, combustion can be controlled by regulating the flow and the jet flow direction of the corner-type secondary air nozzles and the wall-type secondary air nozzles according to actual requirements. Therefore, the size of the combustion tangent circle of the hearth can be quite effectively controlled, generation of nitric oxides is effectively reduced, and coking of the hearth caused by combustion operation of the combustors close to the walls is avoided.

Description

technical field [0001] The invention relates to the technical field of combustion equipment, in particular to a boiler with controllable tangential combustion. Background technique [0002] In the arrangement of once-through burners in modern boilers, the main arrangement is the arrangement of the primary air and the secondary air burners at the four corners of the furnace (referred to as corner arrangement) and the arrangement of all arranged on the wall (referred to as Wall layout), through the research of many scholars in recent years, it has been found that these two layout methods have their own advantages and disadvantages in actual use. In actual work, the angular arrangement is greatly affected by the poor air supply conditions of the jets on both sides of the burner, so it is difficult to achieve a suitable size for the combustion tangent circle of the furnace, and it may be too small or too large. In general, the actual combustion tangent circle of the furnace is ...

AI Technical Summary

Problems solved by technology

In addition, in a single corner or wall arrangement, the way that the primary and secondary air are injected into the furnace at close positions will lead to earlier mixing between the primary and secondary air, which will lead to more NOx generation in the furnace

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