Effect of high heating rates on products distribution and sulfur transformation during the pyrolysis of waste tires

Wang, Hao; Hu, Hongyun; Yang, Yuhan; Liu, Huan; Tang, Hengjing; Xu, Sihua; Li, Aijun; Yao, Hong

doi:10.1016/j.wasman.2020.08.015

Cited by 53 publications

(5 citation statements)

References 36 publications

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“…The use of pellet feedstock can greatly alleviate the high transportation cost of biomass due to its small bulk density; meanwhile, molten salt can effectively solve the deposition and melting of ash in raw materials during traditional hydrothermal liquefaction and gasification. Molten NaOH–Na 2 CO 3 is also well suited for the treatment of some special organic solid wastes with high Cl/S content, such as PVC, waste tires, and waste plastics, , due to the excellent trapping performance of Cl/S containing gases. The reacted molten salt could be easily regenerated by cheap and readily available calcium hydroxide (e.g., industrial waste carbide slag), avoiding the environmental and economic problems in the industrial process of preparing NaOH by electrolysis of NaCl.…”

Section: Resultsmentioning

confidence: 99%

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production

Zeng

Zhong

et al. 2023

Environ. Sci. Technol.

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Biomass pyrolysis within the alkaline molten salt is attractive due to its ability to achieve high hydrogen yield under relatively mild conditions. However, poor contact between biomass, especially the biomass pellet, and hydroxide during the slow heating process, as well as low reaction temperatures, become key factors limiting the hydrogen production. To address these challenges, fast pyrolysis of the algae pellet in molten NaOH–Na2CO3 was conducted at 550, 650, and 750 °C. Algae were chosen as feedstock for their high photosynthetic efficiency and growth rate, and the concept of coupling molten salt with concentrated solar energy was proposed to address the issue of high energy consumption at high temperatures. At 750 °C, the pollutant gases containing Cl and S were completely removed, and the HCN removal rate reached 44.92%. During the continuous pyrolysis process, after a slight increase, the hydrogen yield remained stable at 71.48 mmol/g-algae and constituted 86.10% of the gas products, and a minimum theoretical hydrogen production efficiency of algae can reach 84.86%. Most importantly, the evolution of physicochemical properties of molten NaOH–Na2CO3 was revealed for the first time. Combined with the conversion characteristics of feedstock and gas products, this study provides practical guidance for large-scale application of molten salt including feedstock, operation parameters, and post-treatment process.

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Section: Resultsmentioning

confidence: 99%

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production

Zeng

Zhong

et al. 2023

Environ. Sci. Technol.

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“…It should be noted that the filling rate of this type of reactor significantly affects the performance and quality of the finished products. The ideal filling rate for oil production is about 15-20%, ensuring optimal heat transfer [27].…”

Section: Pyrolysis Reactor's Effect On Pyrolysismentioning

confidence: 99%

Economic Assessment of Polypropylene Waste (PP) Pyrolysis in Circular Economy and Industrial Symbiosis

Zabaniotou

Vaskalis

2023

Energies

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Plastic waste has a high energy content and can be utilized as an energy source. This study aims to assess the economic feasibility of polypropylene plastic waste (PP) pyrolysis. A literature review was carried out to determine the optimal pyrolysis conditions for oil production. The preferred pyrolysis temperature ranges from 450 °C to 550 °C, where the oil yields vary from 82 wt.% to 92.3 wt.%. Two scenarios were studied. In the first scenario, pyrolysis gas is used for the pyrolysis heating needs, whereas in the second scenario, natural gas is used. An overview of the economic performance of a pyrolysis plant with a capacity of 200,000 t/year is presented. Based on the results, the plant is economically viable, as it presents high profits and a short payback time for both scenarios considered. Although the annual revenues are smaller in scenario 1, the significant reduction in operating costs makes this scenario preferable. The annual profits amount to 37.3 M€, while the return on investment is 81% and the payback time is 1.16 years. In scenario 2, although the plant is still feasible and shows high profitability, the annual profits are lower by about 1.5 M€, while the payback time is 1.2 years.

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“…It can be seen that the process of thermal pyrolysis of waste tires could be cut into three parts. [ 20–24 ] The first part from room temperature to 200 °C is associated with the disappearance of both water and light fractions. The second part, the main degradation process, starts from 200 to around 550 °C, in which most of the rubber is decomposed, including different constituents with heterogeneity of their thermal stability, such as NR, BR, SBR, and plenty of additives.…”

Section: Characterizationsmentioning

confidence: 99%

Catalytic Cracking of Waste Tires using Nano‐ZSM‐5/MgAl‐LDO

Yang

Jiao

et al. 2022

Energy Tech

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Catalytic cracking is a promising approach to realize the resource utilization of waste tires. Herein, a new composite catalyst, nano-ZSM-5/MgAl-LDO, is synthesized, and catalytic cracking of waste tires over the composite catalyst is explored. Experimental results indicate that nano-ZSM-5/MgAl-LDO composite catalyst is characterized by high dispersion of nano-ZSM-5 on the surface of LDO, large Brunauer-Emmett-Teller-specific surface area, large pore diameter and volume, and suitable acid and basic properties. Moreover, not only does the nano-ZSM-5/MgAl-LDO composite catalyst increase the conversion rate (62.04%) and degradation rate (1.33 Â 10 À3 s À1 ) of waste tires, but it also enhances the selectivity (33.32%) of light hydrocarbons in pyrolysis products, which was nearly 10% higher than that of thermal pyrolysis.

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Effect of high heating rates on products distribution and sulfur transformation during the pyrolysis of waste tires

Cited by 53 publications

References 36 publications

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production

Economic Assessment of Polypropylene Waste (PP) Pyrolysis in Circular Economy and Industrial Symbiosis

Catalytic Cracking of Waste Tires using Nano‐ZSM‐5/MgAl‐LDO

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Effect of high heating rates on products distribution and sulfur transformation during the pyrolysis of waste tires

Cited by 53 publications

References 36 publications

Algae Pyrolysis in Molten NaOH–Na2CO3 for Hydrogen Production

Algae Pyrolysis in Molten NaOH–Na2CO3 for Hydrogen Production

Economic Assessment of Polypropylene Waste (PP) Pyrolysis in Circular Economy and Industrial Symbiosis

Catalytic Cracking of Waste Tires using Nano‐ZSM‐5/MgAl‐LDO

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Product

Resources

About

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production

Algae Pyrolysis in Molten NaOH–Na₂CO₃ for Hydrogen Production