Characteristics and synergistic effects of co-combustion of carbonaceous wastes with coal

Önenç, Sermin; Retschitzegger, Stefan; Evic, Nikola; Kienzl, Norbert; Yanık, Jale

doi:10.1016/j.wasman.2017.10.041

Cited by 33 publications

(13 citation statements)

References 36 publications

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“…41 On the contrary, it indicates an antisynergistic effect. 42 This experimental effect may be due to the interaction of molecules of both substances, especially carbon and hydrogen. 42,43 Besides, the calculated values represented the summation of the behaviors of SS and biowaste (RH or HS) in the blends.…”

Section: Methodsmentioning

confidence: 99%

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Chen

Jian

2021

ACS Omega

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This study investigated the co-pyrolysis of blends of sewage sludge (SS) with rice husk (RH) and with hemp straw (HS) at different ratios by using thermogravimetry (TG) and its rate (DTG, derivative TG) analysis at heating rates of 10, 20, and 30 K/min. The resulting kinetic parameters of activation energy (E a ) were calculated by both Flynn−Wall−Ozawa and Kissinger−Akahira−Sunose models, followed by comparison of experimental values with calculated values to reveal the synergistic effects of SS/RH and SS/HS. With increasing additions of RH or HS to SS, a gradual decreasing trend in the experimental pyrolysis temperature range was evident, ranging from 144.5 to 95.2 °C for SS/RH and from 144.5 to 88.8 °C for SS/RH. Moreover, such temperature ranges were 6.7−20.4 °C less than the calculated values at the same blending ratio. The fitting results of the two kinetic models showed that with the same SS mass ratio, the experimental E a * (average activation energy) of both SS/RH and SS/HS were less than the calculated E a *. Especially, the experimental E a * of 7SS−3RH was lower around 43.8% than the calculated E a *, whereas the experimental E a * of 3SS−7HS was lower by about 39.4% than the calculated E a *. Synergistic analysis demonstrated that the co-pyrolysis of RH or HS with SS at various mass ratios presented obvious synergistic effects and then the decrease of E a . The mechanism experiment showed that the co-pyrolysis of SS/HS may promote the decrease of E a by changing the co-pyrolysis gas products or by increasing the overflow of volatile matter and then forming intermediate transition products, while SS/RH may accelerate the decrease of the E a by using an appropriate K addition ratio from RH as a metal catalyst.

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Section: Methodsmentioning

confidence: 99%

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Chen

Jian

2021

ACS Omega

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“…When burning the pyrolysis fuel or initial ELTs, sulfur and nitrogen compounds oxidize and enter the atmosphere and this can also be a source of environmental pollution. The presence of sulfur and nitrogen heteroatoms in ELTs and in the fuel obtained from ELTs is supposed to result mostly in the formation of NO x and SO 2 [12]. Nitrogen and sulfur oxide emissions were detected with ELT combustion in cement kilns [13].…”

Section: Introductionmentioning

confidence: 98%

End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

et al. 2019

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Several million tons of end of life tires (ELTs) are piled annually as a result of human activities. Various methods have been proposed for the extraction and recycling of the resource potential of ELTs. The chemical composition of ELTs seems to enable their usage as a fuel after mechanical separation of a steel cord. Indeed, in the rubber of ELTs, up to 90 mass% accounts for carbon and hydrogen. Currently, it is by incineration that a significant proportion of ELTs is utilized. However, ELTs contain not only sulfur, which is used for vulcanization, but also nitrogen-containing additives. The behavior of these heteroatoms during oxidation is poorly investigated. It has been shown that the pyrolysis liquid fuel obtained from ELTs contains such sulfur compounds as mercaptans and nitrogen in the form of hydrocyanic acid and cyanogen. Deep oxidation of ELTs results in the oxidation of sulfur compounds to dioxide, but the oxidation products have been found to contain traces of cyanogen. Taking this into account, one should pay attention to the ways of transforming heteroatoms during the process of ELT oxidation and the products of ELT pyrolysis as potential sources of highly toxic gas emissions.

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“…Tang et al [19] found that NO x and SO x emissions were reduced in oxy-fuel combustion when the temperature was in a certain range of 800 • C to 1000 • C. Ding et al [20] affirmed that the generation of NO x is significantly suppressed in the process of O 2 /CO 2 combustion. In addition, co-firing solid waste and other fuels is also a way to reduce pollutant emissions [21]. For example, researchers mixed solid waste with biomass or coal to improve combustion performance and reduce pollutant emissions [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, co-firing solid waste and other fuels is also a way to reduce pollutant emissions [21]. For example, researchers mixed solid waste with biomass or coal to improve combustion performance and reduce pollutant emissions [21][22][23]. However, considering people's different lifestyles, consumption standards and environmental awareness, the components of municipal solid waste are also different, which causes distinct pollutant emission characteristics [24].…”

Section: Introductionmentioning

confidence: 99%

Emission Characteristics of Pollution Gases from the Combustion of Food Waste

Liu

Hong

2021

Energies

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The emission characteristics of pollution gases produced via the combustion of food waste were studied through a laboratory-scale electrically heated tube furnace. The results showed that the pollution gases generated from the combustion of food waste were CO, H2 and NOx. Each emission curve of CO had a peak. When the combustion temperature rose from 400 °C to 1000 °C, the peak first increased (from 400 °C to 700 °C) and then decreased (from 800 °C to 1000 °C). However, the burnout time shortened with the increase in temperature. Therefore, food waste should be combusted at a higher temperature than 700 °C from the perspective of reducing CO emissions. The emissions of H2 were similar to those of CO. In other words, if CO emissions increased, H2 emissions also increased in the same temperature range. Some NOx emission curves had two peaks (the combustion of cooked rice at 1000 °C; the combustion of vegetable leaves in the temperature range of 600 °C to 1000 °C). The higher the combustion temperature, the higher the second NOx emission peak. NOx emissions from the combustion of cooked rice were greater in the temperature range of 400 °C to 500 °C, whereas for vegetable leaves, that temperature range was from 600 °C to 700 °C. Hence, from the viewpoint of reducing pollution gases, food waste should be combusted at a higher temperature than 700 °C.

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Characteristics and synergistic effects of co-combustion of carbonaceous wastes with coal

Cited by 33 publications

References 36 publications

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

Synergistic Effects on the Co-pyrolysis of Agricultural Wastes and Sewage Sludge at Various Ratios

End of Life Tires as a Possible Source of Toxic Substances Emission in the Process of Combustion

Emission Characteristics of Pollution Gases from the Combustion of Food Waste

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