Design of porous wall air coupling with air staged furnace for preventing high temperature corrosion and reducing NOx emissions

Ma, Honghe; Zhou, Lu; Ma, Suxia; Du, Huijuan

doi:10.1016/j.applthermaleng.2017.06.029

Cited by 18 publications

(13 citation statements)

References 42 publications

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“…SO 2 removal brings extra resources consumption, hence, induces extra GHG emissions [26][27][28][29]. Typically, coal-fired power plants in western China are equipped with WFGD facilities to remove SO 2 .…”

Section: Co 2 Emissions By So 2 Removalmentioning

confidence: 99%

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

2019

Env Prog and Sustain Energy

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Focusing on greenhouse gases (GHGs), this article explores the actual emissions and mitigation burden of coal‐fired power plants in western region of China. Utilizing the 2006 IPCC technology‐detailed methodology, this article developed a coal content‐based GHG measurement system under consideration of N2O emission and SO2 removal, thereafter employed it to evaluate 151 power plants in western China in 2014. At regional level, the three segmented emission sources: CO2 and N2O from coal combustion, and CO2 from sulfur content depreciation, each contributes to emission intensity at 1011.26, 8.24 and 6.09 gCO2e/KWh, respectively. At plant‐specific level, emission intensity is very different, with an average of 1025.60 as well as an interval of 722.38–1796.67 gCO2e/KWh, which implies large gap in mitigation burden among power plants. Comparing mitigation cost of two pathways: CCS technology and carbon market mechanism, it is verified that on average, the former induces electricity price raised by 64.84%–97.26%, while the latter only induces 8.32% upward. From mitigation burden perspective, carbon market is more feasible than CCS technology to motivate power plant to carry out GHGs abatement in the short‐run period. © 2019 American Institute of Chemical Engineers Environ Prog, 38: e13224, 2019

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Section: Co 2 Emissions By So 2 Removalmentioning

confidence: 99%

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

2019

Env Prog and Sustain Energy

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“…In order to prevent the negative effect of air staged, the multihole wall air coupling with air-staged technology (MH&AS) has been developed by Ma and co-workers, , and the design idea is introduced in detail in the previous study. , Here is a brief description about MH&AS with its schematic diagram shown in Figure . There are a large number of small holes on the flat fins of the partial membrane water wall in the reduction zone, and the centerlines of the small holes are all perpendicular to the surface of the membrane water wall.…”

Section: Profile Of Multihole Wall Air Compuling With Air-staged Tech...mentioning

confidence: 99%

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Zhou

et al. 2018

Energy Fuels

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Air-staged combustion is one of the most sophisticated and effective technologies for reducing NOx emission during pulverized coal combustion. However, it may also result in problems of high-temperature corrosion, slagging, and highimperfect/incomplete combustion loss. In order to prevent these problems, the multihole wall air coupling with air-staged technology (MH&AS) has been developed. The aim of this work is to investigate the impact of MH&AS on NOx emission by applying a laboratory scale of a MH&AS furnace. The results show that there existed an optimal multihole wall air ratio to significantly reduce the NOx emission. For example, with burner air ratios of 0.6, 0.7, 0.8, and 0.9, the corresponding optimal multihole wall air ratios were 0.100, 0.075, 0.050 and 0.025, respectively. The air distribution mode with a smaller burner air ratio and its optimal multihole wall air ratio were more conducive for NOx reduction. Furthermore, the influence of coal properties on NOx emission was also evaluated. The higher the fuel ratio, the larger the optimal multihole wall air ratio, whereas the finer the pulverized coal, the smaller the optimized multihole wall air ratio. There was a critical moisture content for the specified coal to obtain the minimum of NOx emission. In addition, the effect of MH&AS on the burnout was also explored. The optimal multihole wall air ratio could simultaneously make a minimum amount of NOx emission and the ultimate value of burnout. Finally, the mechanism of NOx reduction by char during MH&AS combustion was proposed.

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“…These substances (H 2 S, [S], HCl and Cl 2 ) will diffuse to and react with the bare tube metal forming FeS, Fe 3 O 4 , FeCl 2 , FeS 2 , etc. 11 Furthermore, a high pulverized coal concentration could be formed near the water-cooled wall. And the ash melting point temperature of that pulverized coal will be much higher than the fireside water-cooled wall temperature because of the endothermic effect of the water-cooled wall, 11 so it is more likely to form slagging.…”

Section: Introductionmentioning

confidence: 99%

“… 11 Furthermore, a high pulverized coal concentration could be formed near the water-cooled wall. And the ash melting point temperature of that pulverized coal will be much higher than the fireside water-cooled wall temperature because of the endothermic effect of the water-cooled wall, 11 so it is more likely to form slagging. Moreover, this process may become more serious in a tangential-fired boiler because the trend of primary air jet deflection occurring more easily.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, this process may become more serious in a tangential-fired boiler because the trend of primary air jet deflection occurring more easily. 11,12 Therefore, it is significant to develop combustion techniques with combustion stability, slagging resistance, anti-high-temperature corrosion, pollution control and high combustion efficiency. 13…”

Section: Introductionmentioning

confidence: 99%

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Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Wang

Cheng

et al. 2018

RSC Adv.

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A three-component particle-dynamics anemometer was used to measure the characteristics of two-phase gas-particle flows in a primary air nozzle using a gas/particle two-phase test facility. The jet trajectory of primary air velocities, Reynolds stress and particle concentration profiles were obtained. Based on this, the advantages and disadvantages of increasing the offset angle were analyzed to optimize performance. The results show that gas-particle slippage is not noticeable in the furnace, even though the midsecondary air offset angle changes. Within the jet's free developing zone, the location of the peak concentration does not change with the mid-secondary air offset angles. Properly enlarging the offset angle of mid-secondary air nozzles will delay the mixing of the secondary air into the primary-air-andcoal mixture and realize horizontal-staged combustion in a furnace. It also can enhance the stability of airflow and form a better blended jet tail, meanwhile reducing the vortex at the back-fire side and avoiding a short circuiting of the airflow. It is favorable for increasing combustion efficiency and preventing slagging and high-temperature corrosion.

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Design of porous wall air coupling with air staged furnace for preventing high temperature corrosion and reducing NOx emissions

Cited by 18 publications

References 42 publications

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

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Design of porous wall air coupling with air staged furnace for preventing high temperature corrosion and reducing NOx emissions

Cited by 18 publications

References 42 publications

GHGs emission and mitigation burden for power plants in western china considering N2O and SO2 removal

GHGs emission and mitigation burden for power plants in western china considering N2O and SO2 removal

Impact of the Multihole Wall Air Coupling with Air Staged on NOx Emission during Pulverized Coal Combustion

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

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Product

Resources

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GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal

GHGs emission and mitigation burden for power plants in western china considering N₂O and SO₂ removal