A Novel Pulverized Coal Fired Burner

Abstract

A novel pulverized coal fired burner, called “main burner with double primary air channels for pulverized coal”, is presented in this paper. Such a burner can burn various kinds of coals, including bituminous coal, low grade coal, lignite, semianthracite, anthracite, satisfying stability of combustion, controllability of the ignition location of pulverized coal, high efficiency, and low NO x , emission, thereby eliminating the unstable combustion caused by variation of coal quality and low load operation. It has not only solved the problem of low load operation and the combustion without oil assisting of Jiafu anthracite, which is the most difficult coal to burn in China, but also first successfully conducted the normal combustion in a tangentially pulverized anthracite fired furnace, as in a W-shaped flame furnace. According to the low load test on a tangentially pulverized coal fired furnace of 1025 t/h of anthracite combustion, its stability is superior to that of a W-shaped flame furnace with the same capacity, they will compete with each other in the future in China. This burner has been applied in the furnace of large scale, medium-and small-sized power stations in China, and even taken as finalized design for large tangentially low-volatile pulverized coal fired furnaces in Harbin Boiler Works, the biggest one in China. Also if used in W-shaped flame furnaces, it can further improve their combustion performance and reduce the steel consumption.