FLUID COOLED CYCLONE TO SERVE AS AN EXTERNAL HEAT EXCHANGER PLACED IN BETWEEN COMBUSTOR AND BACKPASS OF A CIRCULATING FLUIDISED BED BOILER

摘要

Fluid cooled cyclone (2) is made up of plurality of tube panels and outer cross section of the cyclone is octagonal to accommodate the Panels. A circular ring header (6) acts as an outer for the fluid medium and is formed around the cyclone (2) outlet opening. Loose tubes (7) are connected to the header (6) stubs to carry the medium forward. These tubes are first bend vertically down and then outwards to form the octagonal cross section of the cyclone (2). In the upper cylindrical portion (16) of the cyclone (2), opening for flue gas outlet is formed by plurality of loose tubes (10). After the cylindrical portion (16) is over cyclone (2) cross section starts decreasing in the conical section (15). At the bottom portion of the cyclone (2), loose tubes (13) are takes vertically down and then horizontally outwards to connect with the inlet ring header (14) stubs. Fluid cooled cyclone provides extra heating surface in the boiler and reduces enormous refractory application.