A novel pulverized coal fired burner

A novel pulverized coal fired burner, called "main burner with double prima ry air channels for pulverized coal", is presented in this paper. Such a bu rner can burn various kinds of coals, including bituminous coal, low grade coal, lignite, semianthracite, anthracite, satisfying stability of combusti on, controllability of the ignition location of pulverized coal, high effic iency, and low NO, emission, thereby eliminating the unstable combustion ca used by variation of coal quality and low load operation. It has not only s olved the problem of low load operation and the combustion without oil assi sting of Jiafu anthracite, which is the most difficult coal to burn in Chin a, but also first successfully conducted the normal combustion in a tangent ially pulverized anthracite fired furnace, as in a W-shaped flame furnace. According to the low load test on a tangentially pulverized coal fired furn ace 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 fur nace of large scale, medium-and small-sized power stations in China, and ev en 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 dame furnaces, it can further improve their combustion performance and reduce the steel consumption.