RICH-LEAN PULVERIZED COAL SEPARATION AND ARRANGEMENT MODE OF DIRECT-FLOW BURNERS IN EIGHT CORNERS WITH DOUBLE FIREBALLS

摘要

A rich-lean pulverized coal separation and arrangement mode of direct-flow burners in eight corners with double fireballs for burning anthracite coal comprises a boiler body (1), a furnace (2), a coal grinding mill (3), a rich-lean pulverized coal separator (4), a pulverized coal pipe (5), a primary air/rich pulverized coal nozzle (6) and a primary air/lean pulverized coal nozzle (7). Each boiler body (1) is provided with eight groups of burners (10) which are located at the same level wherein four groups of burners (10) form an imaginary tangential circle (11) inside the furnace (2), and the other four groups of burners (10) form another imaginary tangential circle (12) inside the furnace (2). Each group of burners (10) is divided into two subgroups in the vertical direction wherein the first subgroup of burners (10) is named a primary air/rich pulverized coal burner, and the second subgroup of burners (10) is named a primary air/lean pulverized coal burner. On the premise of ensuring the power of the entire boiler, the rich-lean pulverized coal separate arrangement mode of direct-flow burners in eight corners with double fireballs can cause the thermal load of the wall of a burner zone to be relatively high; and the timely inflaming of anthracite pulverized coal air flow and the stable combustion of the boiler at low-load without fuel can be ensured.