CFD Simulation of Combustion in a 150 MWe CFB Boiler

2012 ◽  
pp. 65-67 ◽  
Author(s):  
Nan Zhang ◽  
Wei Wang ◽  
Jinghai Li
Keyword(s):  
Cfd Simulation ◽  
Cfb Boiler

scholarly journals Experimental and CFD Simulation Studies on Bell-Type Air Nozzles of CFB Boilers

2019 ◽  
Vol 9 (18) ◽  
pp. 3805
Author(s):  
Zhong Huang ◽  
Lei Deng ◽  
Defu Che
Keyword(s):  
Numerical Simulation ◽  
Working Conditions ◽  
Cfd Simulation ◽  
Circulating Fluidized Bed ◽  
Cold Test ◽  
Structural Defects ◽  
Simulation Studies ◽  
Resistance Change ◽  
Cfb Boiler ◽  
Air Nozzle

In this paper, a new bell-type air nozzle, which overcomes the structural defects of traditional bell-type air nozzles, is proposed and validated by cold test and numerical simulation. The pressure drop characteristic of the new bell-type air nozzle is measured. Furthermore, the causes of cover outlet abrasion and blockage, inner tube fracture, and irregular resistance change in traditional bell-type air nozzles applied in circulating fluidized bed (CFB) boilers are analyzed. Then, the performance of the new bell-type air nozzle is evaluated in a real CFB boiler, which is operated under regular working conditions. The results show that the new bell-type air nozzle has stronger anti-wear ability, excellent resistance characteristics, longer service life, and easier maintenance.

scholarly journals 3D CFD simulation of aerodynamics of a 406 MWt CFB boiler

2017 ◽  
Vol 110 ◽  
pp. 01041
Author(s):  
Oleg M. Koksharev ◽  
Andrey V. Gil ◽  
V.M. Lebedev
Keyword(s):  
Cfd Simulation ◽  
Cfb Boiler

Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 24-30 ◽  
Author(s):  
NIKLAS BERGLIN ◽  
PER TOMANI ◽  
HASSAN SALMAN ◽  
SOLVIE HERSTAD SVÄRD ◽  
LARS-ERIK ÅMAND
Keyword(s):  
Circulating Fluidized Bed ◽  
Black Liquor ◽  
Chloride Content ◽  
Pilot Scale ◽  
High Energy ◽  
Kraft Lignin ◽  
High Energy Density ◽  
Alkali Chloride ◽  
Cfb Boiler ◽  
Solid Biofuel

Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cofiring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

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