A SLIT BURNER FOR USE IN SINTERING PLANTS OF STEEL INDUSTRY

摘要

The invention provides a slit burner for use in sintering plants of steel industry, which is capable of producing a curtain-type flame having uniform temperature at a reduced fuel consumption and mounted in. an assembly of a plurality of burners on the roof of the ignition hood of sintering plants with a flame of short length, increased turndown and excess air ratios, and two-stage combustion. The burner comprises a vertically erected central tube for supplying fuel gases, an intermediate tube for supplying primary air and an outer tube for supplying secondary air to the burner, the central tube terminating in a nozzle which extends upto the burner tip and is provided with a sleeve therein for controlling the flow of fuel gases therethrough, the space between the central tube and the intermediate tube being provided with a swirler near the burner tip for imparting a swirling motion to the primary air flowing therethrough, and the space between the intermediate tube and the outer tube being provided with pair of slits, one on each laterial side of the burner tip, for allowing the secondary air to flow therethrough and control the shape of the flame produced by the burner to be of curtain type, the burner tip being fitted into a burner block which is housed in a double walled metallic box and is provided with tapered groovy expanding downwardly.