An
anthracite-combusted single fire ball four-corner
direct current burner includes four burner groups placed at the four corners at a
hearth and at least one
coal pulverizer, wherein the pulverized
coal airflow sprayed by the burner groups forms an imaginary tangent circle at the center of the
hearth; two groups of burners are vertically arranged at each burner group at intervals; four pulverized
coal pipelines are arranged at the outlet of each coal
pulverizer and are connected to four concentrated / thin pulverized coal separators correspondingly; the separated four ways of concentrated pulverized coal
airflow is transferred to four primary air / concentrated pulverized coal nozzles on the same horizontal plane and at the lower parts of the four corners of the
hearth; and the separated four ways of thin pulverized coal
airflow is transferred to four primary air / thin pulverized coal nozzles on the same horizontal plane and at the upper parts of the four corners of the hearth. Under the premise of meeting the
heat power of the entire boiler, the
anthracite-combusted single fire ball four-corner
direct current burner increases the pulverized coal concentration at the concentrated pulverized coal area, and enables the wall
thermal load qHr at the lower part of the burner to be higher, thereby enabling the
combustion temperature at the lower part of the burner to meet the requirement of
inflammation and stable
combustion for the
anthracite, and guaranteeing the anthracite pulverized coal airflow to be combusted timely and the low-load stable
combustion of the oilless boiler.