一次风温对浓淡煤粉射流着火特性的影响

To further advance pulverized coal (PC) combustion theory and guide the operation of horizontal bias combustion PC burner, combustion experiments were conducted in a 250kW bias combustion simulator; combustion temperatures, flame spectra and NO_x were investigated. A blend of sub-bituminous coal from Indonesia and bituminous coal from Australia was tested. The effects of primary air temperature (PAT) on the ignition characteristics of bias PC jets in a reducing atmosphere were investigated. The results indicate that with increasing PAT, the standoff distance gradually decreased, the peaks of subsequent combustion temperature and visible-light intensity gradually increased, the flame stability gradually increased and the NO_x formation during ignition process became less. The increasing of PAT changed the ignition mode of bias PC jets, there was homogeneous ignition mode at PAT of 70℃; while PATs was no less than 85℃ the ignition mode changed to homogeneous- heterogeneous combined ignition, which is beneficial to the ignition.