Numerical simulation of coal particle size (fineness) effect to combustion characteristics of sub-critical pulverized coal boiler 600 MW capacity

2019 ◽  
Author(s):  
Heri Purnomo ◽  
Bambang Sudarmanta
Keyword(s):  
Numerical Simulation ◽  
Particle Size ◽  
Coal Particle ◽  
Combustion Characteristics ◽  
Pulverized Coal ◽  
Pulverized Coal Boiler ◽  
Coal Boiler

Numerical Simulation of O2/CO2 Pulverized Coal in 300MW Boiler

2013 ◽  
Vol 732-733 ◽  
pp. 133-137
Author(s):  
Li Li Li ◽  
Chao Qu
Keyword(s):  
Numerical Simulation ◽  
Flue Gas ◽  
Volume Fraction ◽  
Simulation Software ◽  
Pulverized Coal ◽  
Central Position ◽  
Pulverized Coal Boiler ◽  
Combustion Technology ◽  
Secondary Air ◽  
Coal Boiler

O2/CO2combustion technology is an effective method to capture and store coal-fired boiler flue gas CO2. With a 300MW subcritical pulverized coal boiler as the research subject investigated, Fluent numerical simulation software is used to simulate the process of pulverized coal combustion both in air and O2/CO2conditions. The comparative analyses are made both in the former conditions, such as the combustion characteristics of pulverized coal, the influence of oxygen volume fraction, the effect of the secondary air temperature on the temperature field in the furnace of pulverized coal boiler. As for the following results of the pulverized coal combusted in the O2/CO2condition, compared with the results in the air condition, its time of ignition is delayed, and the combustion temperature is low and the central position of flame rises. With the increasing percentage of the oxygen volume and the rising temperature of secondary air, the time of ignition speeds up, which improves the overall furnace temperature level and transferring capability of the radiation heat.

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

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.

scholarly journals Numerical study on the influence of platen super-heater on combustion characteristics in a 600 MW tangentially fired pulverized-coal boiler

2020 ◽  
pp. 245-245
Author(s):  
Kai Chen ◽  
Xinfei Liu ◽  
Yao Qin
Keyword(s):  
Heat Transfer ◽  
Numerical Study ◽  
Species Distributions ◽  
Combustion Characteristics ◽  
Pulverized Coal ◽  
Heat Distribution ◽  
Pulverized Coal Boiler ◽  
Super Heater ◽  
Coal Boiler ◽  
Weak Influence

Numerical simulations have been conducted to study combustion characteristics of tangentially fired pulverized-coal boiler. A 600 MW tangentially coal-fired boiler was used for investigating the effect of platen super-heaters on the temperature, species distributions and heat transfer. Two furnace models were established, whose difference lies in modeling super-heaters or not. Results show that modelling platen super-heaters is conducive to precisely predict the temperature, species (CO, CO2, O2) and heat flux in the platen zone and has a weak influence on these data in zones below the platen. Modelling platen super-heaters has little influence on the NOx prediction. Platen super-heaters obviously decrease heat absorbed by water-wall nearby and affects heat distribution coefficient of furnace.

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