Pulverized coal combustion system
author：EBICO
2019-10-24
Pulverized coal combustion system6MwBoiler Burner
The internationally advanced low nox combustion technology is applied to this series of pulverized coal burner. Herein, fuels are burnt and air is supplied by stage; while burning pulverized coal, “air-coal separation”, “flaring multi-disc combustion stabilizer”, “stage combustion” and “coal surrounded by air” technologies are applied; air is supplied externally for three times, so as to realize staged combustion and reduce emission of NOx effectively.6MwBoiler Burner
Main features of the pulverized coal burner:6MwBoiler Burner
There is a 3-stage pulverized coal concentrator in the primary air channel which separates air and coal of the primary mixer. The flaring multi-disc combustion stabilizer is installed at outside of the central air duct. The air flow of pulverized coal at the peak valley enters the central backflow area directly; the air flow of pulverized coal at the peak point enters the radial backflow area; the backflow pulverized coal and high temperature flue gas are mixed violently to separate out volatile combustible gas and burn pulverized coal at stable poor-oxygen state, so as to reduce emission of NOx and improve the capability of combustion stabilization at low load.6MwBoiler Burner
The transitional direct air is set at the external layer of the primary air to strengthen air staging; the swirling gas is set at outside to prevent pulverized coal from expanding outward too quickly;6MwBoiler Burner
The secondary air is the direct air which ensures sufficient combustion and prevent coking phenomenon effectively;6MwBoiler Burner
The tertiary air reduces high temperature of the flame tube and enables the residual pulverized coal to be exhausted quickly.6MwBoiler Burner
Firing ratio of pulverized coal: 1:46MwBoiler Burner
6MwBoiler Burner
Required coal index6MwBoiler Burner
Lower heating value: 5,500~6,500kcal/kg6MwBoiler Burner
Moisture: <5%6MwBoiler Burner
Sulfur: <0.4%6MwBoiler Burner
Ash content: <7%6MwBoiler Burner
Volatile matter: <30%6MwBoiler Burner
Fineness: 200 meshes, sieving rate: 85%6MwBoiler Burner