A method for burning gasified semi-
coke particles by concentrated-dilute and coarse-fine deep separation and controlled vortex stable
combustion technologies is characterized in that low-rank
coal primary air semi-
coke powder flow carrying gasified semi-
coke is subjected to concentrated-dilute separation to obtain concentrated-phase semi-coke
powder flow and dilute-phase semi-coke
powder flow; the concentrated-phase semi-coke powder flow is subjected to coarse-fine separation to obtain concentrated-phase coarse semi-coke powder flow and concentrated-phase fine semi-coke flow; the dilute-phase semi-coke powder flow and secondary air are mixed, and the mixture is guided into an outer-layer
nozzle of a
combustion chamber; and the concentrated-phase fine semi-coke powder flow and the concentrated-phase coarse semi-coke powder flow are guided into an inner-layer
nozzle and an intermediate-layer
nozzle of the
combustion chamber respectively and then sprayed into the
combustion chamber, a controlled vortex bluff body device and an auxiliary
aeration secondary air nozzle are mounted in the inner-layer nozzle of the
combustion chamber, and during ignition, the concentrated-phase fine semi-coke powder flow sprayed by the inner-layer nozzle of the
combustion chamber is ignited at first. The method can effectively improve ignition, combustion and burn-out characteristics of gasified semi-coke, reduces
pollutant discharge and can effectively prevent a furnace wall from
slag-bonding and a water wall from high-temperature
corrosion.