Effects of pulverized coal particle size on flame structure in a methane-assisted swirl burner

The paper investigates the molding process of producing formed coke with low rank pulverized coal. When the bentonite as binder, the technological conditions mainly including bentonite content, forming pressure, forming moisture and particle size factors which effect on the strength of formed cokes were systematically discussed and obtained the optimal conditions. Under the conditions of amount of bentonite 5%, forming pressure 40kN, moisture content 14%, and fine coal particle size<5mm the formed coke with strength of 600N/ball was prepared and it satisfied the standard of gasification behavior of formed coke.

Download Full-text

Numerical simulation study on the influence of pulverized coal particle size on boiler combustion characteristics

E3S Web of Conferences ◽

10.1051/e3sconf/202021801009 ◽

2020 ◽

Vol 218 ◽

pp. 01009

Author(s):

Zhihai Cheng ◽

Yang Li ◽

Zhonghan Zhang

Keyword(s):

Numerical Simulation ◽

Particle Size ◽

Combustion Zone ◽

Coal Particle ◽

Average Particle Size ◽

Pulverized Coal ◽

Average Particle ◽

Temperature Level ◽

Nox Formation ◽

Average Temperature

The influence of pulverized coal particle size on combustion and NOx formation of 660MW tangential combustion ultra-supercritical boiler in a power plant was studied by using commercial software FLUENT. The average particle size of pulverized coal was set at 61μm, 71μm and 80μm, respectively. The results show that with the decrease of pulverized coal particle size, the overall temperature level of the boiler increases, the average temperature of the main combustion zone increases, the temperature of the upper part of the main combustion zone decreases, and the combustion of pulverized coal is more incomplete. However, the probability of particles sticking to the wall and the probability of coking and slagging of the boiler increases. The amount of NOx produced in the main combustion zone decreases, while the amount of NOx produced in the upper part of the main combustion zone increases, while the overall amount of NOx produced increases slightly.

Download Full-text

Effects of coal particle size on the two-phase flow and slagging performance in a swirl burner

Energy ◽

10.1016/j.energy.2021.121797 ◽

2021 ◽

pp. 121797

Author(s):

Neng Fang ◽

Pan Zhang ◽

Weiliang Wang ◽

Qian Wang ◽

Junfu Lyu ◽

...

Keyword(s):

Particle Size ◽

Coal Particle ◽

Two Phase Flow ◽

Phase Flow ◽

Swirl Burner ◽

Two Phase

Download Full-text

Effect of Co-firing PKS and Coal on Flame Structure in a Pulverized Coal Swirl Burner

Journal of the Korean Society of Combustion ◽

10.15231/jksc.2016.21.4.030 ◽

2016 ◽

Vol 21 (4) ◽

pp. 30-38

Author(s):

Minho Shin ◽

Yonmo Sung ◽

Minsung Choi ◽

Gwangsu Lee ◽

Gyungmin Choi ◽

...

Keyword(s):

Flame Structure ◽

Pulverized Coal ◽

Swirl Burner

Download Full-text

The Analysis of the Pulverized Coal Deposition in the Pump Cylinder in Drainage and Mining of the Coal Bed Methane (CBM)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.712-715.1359 ◽

2013 ◽

Vol 712-715 ◽

pp. 1359-1362 ◽

Cited By ~ 1

Author(s):

Yan Ping Sun ◽

Ning Zhao ◽

Wen Tao Qu

Keyword(s):

Particle Size ◽

Coal Particle ◽

Pulverized Coal ◽

Coal Bed ◽

Coal Bed Methane ◽

Size Change ◽

Lower Velocity ◽

Pressure Drag ◽

Coal Particles ◽

Pump Cylinder

In drainage and mining of the coal bed methane(CBM),pump valve jams caused by the settlement of pulverized coal particles directly affect the normal production of the coal bed methane(CBM).From the study of the pulverized coal particle size,this paper summarizes the law of the pulverized coal particle size change in various stages of the coal bed methane(CBM) production well drainage and ming.By analyzing the pulverized coal particle velocity distribution along the pump cylinder,the viewpoint that the pulverized coal particle has a higher axial velocity in the central part of the settlement and has a lower velocity near the wall surface is put forward to.Based on the theory,the motion track equation of the pulverized coal particle can be got by calculation.Under the condition of considering buoyancy,fluid resistance and pressure drag,instant drop speed of the pulverized coal in water is calculated.

Download Full-text