Multi-stage air supply and feeding device of boiler

Abstract

The invention relates to the technical field of feeding, and discloses a multi-stage air supply feeding device of a boiler, which comprises a square tube arranged in an inclined manner; a sliding plate is arranged in the square pipe and divides the square pipe into a material conveying cavity and an air supply cavity which are independent of each other. The sliding plate comprises a plurality of plate blocks which are distributed and arranged in a stepped mode, and the downward ends of the plate blocks are provided with transition sections with acute angles, so that accumulation dead zones in the fuel conveying process are reduced, fuel is guided to slide downwards in an accelerated mode along the inclined transition sections, and local retention is reduced. An air supply channel is formed by a fall gap between every two adjacent plates, and airflow in the air supply cavity is output through the air supply channels and attached to the upper surfaces of the plates to flow to form an air film layer used for reducing the sliding friction coefficient between fuel and the surfaces of the plates; fuel accumulation dead zones are eliminated through the stepped sliding plate, continuous sliding is guided, friction is reduced in cooperation with an air film layer on the upper surface of the sliding plate, the fuel conveying efficiency is improved, blockage is avoided, and abrasion and energy consumption are reduced.

Images