Combustion and NO Emission of Shenmu Char in a 2 MW Circulating Fluidized Bed

Gong, Zhiqiang; Liu, Zhicheng; Zhou, Tuo; Qi, Lu; Sun, Yuan

doi:10.1021/ef502768w

Cited by 42 publications

(23 citation statements)

References 36 publications

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“…The surface morphology of OS and OS chars from pyrolysis in the tube furnace reactor is shown in Figure , analyzed by scanning electron microscopy (SEM). The surface of OS was smooth with a dense texture while the surface of OS char was rough with well-developed pore structure formed during pyrolysis . Volatiles of OS were released during OS pyrolysis from the inside of the OS particles, causing formation of pores on the surface of particles and the increase of specific surface area.…”

Section: Results and Discussionmentioning

confidence: 99%

Experimental Study on Pyrolysis Characteristics of Oil Sludge with a Tube Furnace Reactor

Gong

Wang

et al. 2017

Energy Fuels

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Oil sludge (OS) pyrolysis was conducted with a tube furnace reactor. Production distributions and compositions were investigated under different conditions of pyrolysis temperature, heating mode, and atmosphere (N2/CO2). Little change was detected with the product yields of char, oil, and gas when the final temperature exceeded 600 °C. Compared with slow pyrolysis, oil and char yields decreased and gas yield increased in fast pyrolysis. CO2 could promote OS pyrolysis, resulting in a reduction of char yield. SEM images showed that the surface of OS was smooth with a dense texture while the surface of OS char was rough with a well-developed pore structure that formed after pyrolysis. Simulated distillation results showed that light fractions from OS pyrolysis were more than 30% higher than those of oil from OS extraction. With the increase of pyrolysis temperature, light fractions (gasoline, diesel, and jet fuel) in pyrolysis oil decreased. During fast pyrolysis, the heavy fractions produced can be cracked into light fractions. The content of light fractions was 46% compared with 34% for oil from slow pyrolysis. It did not differ much with the oil product distributions from pyrolysis in inert (N2) and CO2 atmosphere. The yields of C4–6 and C6 were higher than those of CH4 in slow pyrolysis between 500 and 700 °C. Fast pyrolysis and CO2 atmosphere favored the conversion of stable macromolecules to short chain methyl compounds, resulting in a higher CH4 yield.

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Section: Results and Discussionmentioning

confidence: 99%

Experimental Study on Pyrolysis Characteristics of Oil Sludge with a Tube Furnace Reactor

Gong

Wang

et al. 2017

Energy Fuels

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“…The circulating fluidized bed (CFB) boiler has a de-NO x advantage over the pulverized coal boiler. − Traditional CFB combustion has difficulty reaching ultralow NO x emission standards. − Tourunen et al . found that NO x emissions from CFB were even more sensitive to oxygen concentration rather than combustion temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental Research on the Conversion of Fuel Nitrogen in the Postcombustion Chamber of the Circulating Fluidized Bed

Xiao

Song

et al. 2021

Energy Fuels

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The postcombustion technology involved the application of the deep air-staged combustion technology to circulating fluidized bed (CFB) combustion. To further develop its de-NO x potential, three kinds of fuel were adopted to investigate the conversion of carbon and nitrogen along the postcombustion chamber (PCC) in a 0.15 MWth CFB test platform. By ultimate analysis of fly ash and gas components analysis, it was found that the char content in fly ash and CO in the gas phase gradually decreased along the PCC and the flue gas pass. The majority of CO and char particles in fly ash would burn out in the PCC. Similar to char and CO, the nitrogen content in fly ash also gradually decreased along the PCC and the flue gas pass. Although the fuel-N was gradually released into the gas phase, the NO x concentration first sharply increased and then slightly decreased instead of increasing monotonically. In addition, the relationship between fuel-N conversion and fuel characteristics was established. The results indicated that the conversion rate of fuel-N in the furnace and in the PCC increased with volatile content and fixed carbon content, respectively. This phenomenon proved that the volatile nitrogen (volatile-N) and char nitrogen (char-N) had different transformation tendencies in the postcombustion technology. Moreover, the most likely conversion paths of fuel-N in the postcombustion technology were proposed. Based on the above findings, it was inferred that the NO x from the combustion of coal with low volatile content and high fixed carbon content would be higher in the postcombustion technology. The NO x emission experiment results agreed with the above reference well.

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“…Moreover, they investigated the coal pyrolysis using model compounds and a synthetic coal by TG/MS/FTIR [7] and proved that synthetic coal can be very useful for the study of the reaction mechanisms that involve nitrogen during coal pyrolysis and combustion. Gong et al [8,9] studied the combustion and NO emission of Shenmu char with a TG-MS system and found that the combustion of Shenmu char was problematic due to late ignition, poor combustion stability, and poor burnout compared with Shenmu coal. Wang et al [10] used TG/MS/FTIR system to study the pyrolysis of five coals.…”

Section: Introductionmentioning

confidence: 99%

Study on combustion and emission characteristics of chars from low-temperature and fast pyrolysis of coals with TG-MS

Liu

Gong

Wang

et al. 2019

Environmental Engineering Research

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To achieve the clean and efficient utilization of low-rank coal, the combustion and pollutant emission characteristics of chars from low-temperature and fast pyrolysis in a horizontal tube furnace were investigated in a TG-MS analyzer. According to the results, the combustion characteristic of chars was poorer than its parent coals. The temperature range of gaseous product release had a good agreement with that of TGA weight loss. Gaseous products of samples with high content of volatile were released earlier. The NO and NO 2 emissions of chars were lower than their parent coals. Coals of high rank (anthracite and sub-bituminous) released more NO and NO 2 than low rank coals of lignite, so were chars from coals of different ranks. SO 2 emissions of char samples were lower than parent coals and did not show obvious relationship with coal ranks.

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Combustion and NO Emission of Shenmu Char in a 2 MW Circulating Fluidized Bed

Cited by 42 publications

References 36 publications

Experimental Study on Pyrolysis Characteristics of Oil Sludge with a Tube Furnace Reactor

Experimental Study on Pyrolysis Characteristics of Oil Sludge with a Tube Furnace Reactor

Experimental Research on the Conversion of Fuel Nitrogen in the Postcombustion Chamber of the Circulating Fluidized Bed

Study on combustion and emission characteristics of chars from low-temperature and fast pyrolysis of coals with TG-MS

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