Plasma-Assisted Combustion Technology for NOx Reduction in Industrial Burners

2013 ◽  
Vol 47 (19) ◽  
pp. 10964-10970 ◽  
Author(s):  
Dae Hoon Lee ◽  
Kwan-Tae Kim ◽  
Hee Seok Kang ◽  
Young-Hoon Song ◽  
Jae Eon Park
Keyword(s):  
Nox Reduction ◽  
Plasma Assisted Combustion ◽  
Combustion Technology

Plasma assisted combustion: kinetic studies and new combustion technology

2015 ◽  
Author(s):  
Yiguang Ju ◽  
Joseph K. Lefkowitz ◽  
Tomoya Wada ◽  
Xueliang Yang ◽  
Sang Hee Won ◽  
...  
Keyword(s):  
Kinetic Studies ◽  
Plasma Assisted Combustion ◽  
Combustion Technology

scholarly journals Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen

2018 ◽  
Vol 8 (12) ◽  
pp. 2499 ◽  
Author(s):  
Chang’an Wang ◽  
Pengqian Wang ◽  
Lin Zhao ◽  
Yongbo Du ◽  
Defu Che
Keyword(s):  
Oxygen Content ◽  
Power Plants ◽  
Large Scale ◽  
Nox Reduction ◽  
Fuel Combustion ◽  
Combustion Technology ◽  
Carbon Dioxide Co2 ◽  
No2 Formation ◽  
The Impact ◽  
Pyridinic Nitrogen

Oxy-fuel combustion technology can capture carbon dioxide (CO2) in the large-scale and greatly lower nitrogen oxides (NOx) emission in coal-fired power plants. However, the influence of inherent minerals on NOx reduction still remains unclear and the impact of oxy-fuel combustion on the transformation of different nitrogen functional groups has yet to be fully understood. The present work aims to obtain a further understanding of the NOx reduction during oxy-fuel combustion using synthetic coals with pyrrolic or pyridinic nitrogen. Compared to pyridinic nitrogen, more of the pyrrolic nitrogen in synthetic coal was converted to NOx. The conversion ratio of nitric oxide (NO) first increased significantly with the rising oxygen content and then trended to an asymptotically constant as the oxygen (O2) content varied between 10–50%. The nitrogen dioxide (NO2) formation was roughly proportional to the oxygen content. The NO2 conversion was increased with particle size but the case of NO showed a non-monotonic variation. The catalytic effects of sodium carbonate (Na2CO3), calcium carbonate (CaCO3), and ferric oxide (Fe2O3) on the transformation of pyridinic nitrogen to NO were independent of the combustion atmosphere, while the alteration from air to the oxy-fuel combustion led to a change of mineral catalytic effect on the oxidation of pyrrolic nitrogen within the coal matrix.

Application Analysis on the Bias and Air Staged Combustion Technology in the Opposed Firing Boiler

2011 ◽  
Author(s):  
Tai-sheng Liu
Keyword(s):  
Recirculation Zone ◽  
Nox Reduction ◽  
Pulverized Coal ◽  
Nox Emission ◽  
Unburned Carbon ◽  
Staged Combustion ◽  
Bias Model ◽  
Combustion Technology ◽  
Radial Model ◽  
Low Nox Emission

The bias combustion technology has been widely used in the swirling burner. Take the distribution of the pulverized-coal concentration at the primary air outlet as the division principle, there are three kinds of bias combustion models: radial model with inside dense and outside lean, radial model with outside dense and inside lean, and circumferential model. Considering stable ignition and low NOx emission, at the phase of the pulverized-coal ignition, the dense pulverized-coal flow should be heated by the high temperature flue gas intensively and quickly to ensure the coal’s timely ignition and form an In-flame NOx reduction zone for low NOx emission. Hence the bias combustion technology should be in accordance with the recirculation zone. So the radial bias model with inside dense and outside lean suits to central recirculation zone while radial bias model with outside dense and inside lean suits to annular recirculation zone. The circumferential bias model suits to both recirculation zones. Furthermore, appropriate measures should be taken on the burner’s arrangement and furnace’s design to prevent the obvious increase of slagging problem and unburned carbon in fly ash when using bias and air staged combustion technology.

NOx Emissions From Combustion of High Sulfur Lignite in an ABFBC Test Rig

2003 ◽  
Author(s):  
Nevin Selc¸uk ◽  
Aykan Batu ◽  
Olcay Oymak
Keyword(s):  
Fluidized Bed ◽  
Nox Reduction ◽  
Volatile Matter ◽  
Pollutant Emissions ◽  
Nox Emissions ◽  
Fluidized Bed Combustion ◽  
Test Rig ◽  
Bubbling Fluidized Bed ◽  
Combustion Technology ◽  
Fluidized Bed Boilers

NOx emissions from fluidized bed combustion of various coals have extensively been investigated and well documented. However, NOx emissions from combustion of Turkish lignites with high ash, volatile matter and sulfur contents have not drawn much attention to date. Recent trend in utilization of indigenous lignites in fluidized bed boilers necessitated investigation of pollutant emissions and adaptation of fluidized bed combustion technology to these lignites. In this study, experimental results of various runs pertaining to the formation and emission of NOx from METU 0.3 MWt Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) test rig burning typical indigenous lignites; Aydin without limestone addition and Beypazari with and without limestone addition are presented. NOx profiles along the combustor show that concentrations are higher in bed compared to those in freeboard and that conditions leading to higher unburned volatiles in freeboard enhances NOx reduction in that region. Limestone addition results in higher concentrations of NOx in bed but lower concentrations in freeboard, albeit insignificantly.

Study of NOx Inhibition Technology Based on Water-Gas Reaction

2015 ◽  
Vol 737 ◽  
pp. 584-587
Author(s):  
Tian Hua Wu ◽  
Ren Zhang Qian
Keyword(s):  
Coal Combustion ◽  
Nox Reduction ◽  
Pulverized Coal ◽  
Peak Temperature ◽  
Emission Sources ◽  
Pulverized Coal Combustion ◽  
Staged Combustion ◽  
Combustion Technology ◽  
Low Nox Combustion ◽  
Water Gas

Pulverized coal combustion is one of the main NOx emission sources. The existing low NOx combustion technology can not meet the requirements of environment conservation. In this paper, a new low NOx combustion technology, the NOx inhibition method based on water-gas reaction, is presented, in which steam is injected into the anoxic flame of pulverized coal to bring water-gas reaction and produce CO and H2 which will inhibit the production of NOx. The produced H2 is especially very active. Water-gas reaction is endothermic, which has an effect of reducing the peak temperature of the flame and is very propitious to the inhibition of thermal type NOx. As the water-gas reaction is also an interim process, the heat absorbed in it will be released when burning with oxygen so that the whole amount of heat inside the furnace is not affected. The principle of the method is proved correct by experiments and industrial scale of 420 t/h boiler tests in which the effect of NOx reduction is obvious. The technology is consistent with that of air-staged combustion.

scholarly journals Cost-benefit evaluation of different low NOx combustors of natural gas boilers in Beijing

2021 ◽  
Vol 236 ◽  
pp. 01021
Author(s):  
Penglai Zuo ◽  
Quanming Liang ◽  
Chenlong Wang ◽  
Jiajia Gao ◽  
Tao Yue ◽  
...  
Keyword(s):  
Natural Gas ◽  
Evaluation Model ◽  
Nox Reduction ◽  
Cost Benefit ◽  
Economic Benefits ◽  
Environmental Benefits ◽  
Nox Emission ◽  
Benefit Evaluation ◽  
Combustion Technology ◽  
Low Nox Combustion

This study focuses on establishing a cost-benefit evaluation model of low NOx combustion technology and the environmental benefits and economic benefits evaluation of technology operation were carried out as well. Results showed that: (1) The operation cost per unit calorific supply of the low NOx combustor with larger capacity (14 MW) boilers was 1.5-2.1 yuan/GJ, which was 22.3% to 26.2% as much as that of boilers with smaller capacity (0.7 MW). Compared with scattered boilers with smaller capacity, it is more economical to use boilers with larger capacity for centralized heating. (2) The lower the NOx emission concentration was, the greater the NOx emission reduction was. Furthermore, the lower the NOx emission benefits of low NOx combustor per unit calorific supply was, the greater the economic benefit of NOx reduction per unit calorific supply was. Based on the environmental and economic benefits analysis, the lean premixed combustor is recommended for natural gas boilers with capacity of 7 MW and below, and flue gas recirculation combustor (FGR-30) could be selected for natural gas boilers with capacity above 7 MW to achieve the NOx retrofits requirements of 30 mg/m3 or 80 mg/m3.

Detection method of combustion oscillation characteristics under strong noise background

2020 ◽  
Vol 21 (6) ◽  
pp. 612
Author(s):  
Yunkun Wei ◽  
Tianhong Zhang ◽  
Zhonglin Lin ◽  
Qi Xie ◽  
Yan Zhang
Keyword(s):  
Radiation Thermometry ◽  
Hydroxyl Group ◽  
Interference Signal ◽  
Engine Vibration ◽  
Combustion Technology ◽  
Lean Fuel ◽  
Combustion Oscillation ◽  
Aero Engines ◽  
Temperature Measurement System ◽  
Multispectral Radiation Thermometry

After the lean fuel premixed combustion technology is applied to aero engines, severe combustion oscillations will be cased and led to hidden safety hazards such as engine vibration, further energy waste and other problems. Therefore, it is increasingly important to actively control combustion oscillations. In this paper, a multispectral radiation thermometry (MRT) is used to analyze the hydroxyl group, which is a measurable research object in the combustion chamber of an aero engine, and to fit the functional relationship between the radiation intensity ratio and the temperature in different bands. The theoretical value of the error is <2%. At the same time, in order to solve the problem of weak detection signal and excessive interference signal, an improved frequency domain filtering method based on fast Fourier transform is designed. Besides, the FPGA platform is used to ensure the real-time performance of the temperature measurement system, and simulations and experiments are performed. An oscillating signal with an oscillation frequency of 315 Hz is obtained on the established test platform, and the error is only 1.42%.

APPLICATION OF HIGH-LOW BED CFB COMBUSTION TECHNOLOGY TO OIL SHALE COMBUSTION

Oil Shale ◽  
2013 ◽  
Vol 30 (2) ◽  
pp. 147 ◽  
Author(s):  
W QING ◽  
L HONGPENG ◽  
B JINGRU ◽  
Q HONG ◽  
Y WEN
Keyword(s):  
Oil Shale ◽  
Combustion Technology
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