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 Measurement of O2 in the Combustion Chamber of Apulverized Coal Boiler

10.14311/1544 ◽  
2012 ◽  
Vol 52 (3) ◽  
Author(s):  
Břetislav Janeba ◽  
Michal Kolovratník ◽  
Ondřej Bartoš
Keyword(s):  
Combustion Chamber ◽  
Flue Gas ◽  
Combustion Process ◽  
Pulverized Coal ◽  
Or Management ◽  
Pulverized Coal Boiler ◽  
O2 Concentration ◽  
Coal Boiler ◽  
The Individual ◽  
Lambda Probe

Operational measurements of the O2 concentration in the combustion chamber of a pulverized coal boiler are not yet common practice. Operators are generally satisfied with measuring the O2 concentration in the second pass of the boiler, usually behind the economizer, where a flue gas sample is extracted for analysis in a classical analyzer. A disadvantage of this approach is that there is a very weak relation between the measured value and the condition in specific locations in the fireplace, e.g. the function of the individual burners and the combustion process as a whole. A new extractionline was developed for measuring the O2 concentration in the combustion chamber. A planar lambda probe is used in this approach. The extraction line is designed to get outputs that can be used directly for diagnosis or management of the combustion in the boiler.

Effect of Slot Wall Jet on Combustion Process in a 660 MW Opposed Wall Fired Pulverized Coal Boiler

2019 ◽  
Vol 17 (4) ◽  
Author(s):  
Yong Zhang ◽  
Yao Fang ◽  
Baosheng Jin ◽  
Youwei Zhang ◽  
Chunlei Zhou ◽  
...  
Keyword(s):  
Combustion Process ◽  
Side Wall ◽  
Pulverized Coal ◽  
Operating Conditions ◽  
Gas Velocity ◽  
Pulverized Coal Boiler ◽  
Inclination Angles ◽  
Secondary Air ◽  
Coal Boiler ◽  
Optimized Conditions

Abstract Numerical investigations of an anti-corrosion design and the combustion process (original conditions and optimal conditions) were conducted for a 660 MW opposed wall fired boiler. In order to solve high-temperature corrosion of the side wall, a scheme was proposed: slotting in the side wall and introducing air (closing-to-wall air) from the secondary air. The effect of anti-corrosion was disclosed in detail by varying the structures of slotting, gas velocities from nozzles and jet inclination angles. The temperature and NOx distribution in the furnace at optimized conditions were compared with those at the original operating conditions. Simulation results showed that the structures of the slot and gas velocities from the nozzles had a marked effect on anti-corrosion of the side wall. When the gas velocity was 4 m/s, an inclination angle of the gas velocity was not conducive to anti-corrosion of the side wall. When the gas velocity increased at the middle and bottom of the side wall, the anti-corrosion effect increased significantly. When the optimal scheme was adopted, the corrosion area of the side wall decreased obviously, but the furnace temperature and the NOx emission increased slightly. The detailed results of this work promote a full understanding of closing-to-wall air and could help to reduce the corrosive area in pulverized-coal furnaces or boilers.

scholarly journals Analisis Variasi Sudut Tilting Burner Terhadap Distribusi Temperatur pada Boiler Furnace

2020 ◽  
Vol 1 (1) ◽  
pp. 1-8
Author(s):  
Abi Tonjo Buono ◽  
Candra Damis Widiawaty ◽  
Cecep Slamet Abadi
Keyword(s):  
Flue Gas ◽  
Pulverized Coal ◽  
Boiler Furnace ◽  
Pulverized Coal Boiler ◽  
Coal Boiler

Tangentially fired pulverized-coal boiler dilengkapi fasilitas tilting burner, dimana fasilitas ini memungkinkan burner untuk dapat diarahkan ke atas maupun ke bawah membentuk sudut tertentu terhadap garis horizontal. Sudut tilting burner berfungsi untuk mengontrol posisi vertikal pembakaran dan juga ukuran nyala api untuk menghasilkan distribusi temperatur yang seragam ke semua tube boiler. Sudut kemiringan yang tidak akurat dapat menyebabkan penyebaran panas tidak merata dan temperatur lokal yang tinggi pada salah satu sisi tube. Dalam penelitian ini, model numerik dikembangkan dan divalidasi dengan data eksperimental yang diperoleh dari pengukuran di tempat untuk menyelidiki efek sudut tilting burner terhadap pembakaran. Turbulensi, perpindahan panas dan reaksi kimia dalam ruang bakar direproduksi secara rinci oleh model. Pada penelitian ini, variasi sudut tilting yang dilakukan adalah +20o, +10o, 0o, -10o, dan -20o terhadap garis horizontal. Perubahan ini dibandingkan dengan sudut tilting 0o. Perubahan sudut tilting +10o akan menaikkan temperatur furnace 90oC serta temperatur flue gas pada outlet furnace 40oC.. Perubahan sudut tilting +20o, akan menaikkan temperatur furnace 170oC serta temperatur flue gas pada oulet furnace 90oC. Perubahan sudut tilting -10o akan menurunkan temperatur pada furnace 130oC, dan temperatur flue gas pada outlet furnace 20oC. Sementara perubahan sudut tilting -20o, akan menurunkan temperatur pada furnace 190oC, dan temperatur flue gas pada outlet furnace 90oC. Sudut tilting yang paling sedikit area yang terkena overheating yaitu sudut tilting 0o.

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