Volatile-char interactions during biomass pyrolysis: Reactor design toward product control

Gao, Anjiang; Wang, Yao; Lin, Guiying; Li, Bin; Hu, Xun; Huang, Yong; Zhang, Shu; Zhang, Hong

doi:10.1016/j.renene.2021.12.023

Cited by 24 publications

(5 citation statements)

References 29 publications

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“…The deviations in the course of the TGA and DTG curves of densified PH blends with additives regarding that of the densified PH sample are observed in the temperature range of 500-750 °C (Figure 4). This implies a possible occurrence of interactions between volatile products of pyrolysis and char which was reported in works by many authors [41][42][43]. In the temperature range of 650-700 °C, there is a visible peak in the DTG curve.…”

Section: Pyrolysis Of Ph Samples With Ctp Nl and Ldpe Additivessupporting

confidence: 59%

“…At temperatures above 500 • C, in turn, the secondary reactions, on which the additives also may exert influence, can take place. These reactions can occur not only in the gas phase [44,45] but, also, as a result of the interactions between the volatile products and formed chars [41,43,46]. These considerations follow from an analysis of the thermogravimetric curves in Figure 3.…”

Section: Phmentioning

confidence: 99%

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An Analysis of the Influence of Low Density Polyethylene, Novolac, and Coal Tar Pitch Additives on the Decrease in Content of Impurities Emitted from Densified Pea Husks during the Process of Their Pyrolysis

2023

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The course of pyrolysis of pea husks was studied. It was stated that the compaction of a sample during its pyrolysis causes an almost two-fold increase in the content of hydrocarbons in the composition of volatile products in the temperature range of 350–470 °C. Low density polyethylene (LDPE), novolac, and coal tar pitch (CTP) wastes were added to feedstocks in the amount of 2 wt% in order to decrease the contribution of saturated and unsaturated hydrocarbons along with oxygen-containing compounds in volatile products. The analysis of the obtained products of pyrolysis was conducted using the techniques of thermogravimetry/Fourier transform infrared spectroscopy (TG/FT-IR), attenuated total reflectance (ATR) and ultraviolet (UV)-spectroscopies, gas chromatography-mass spectrometry (GCMS), X-ray diffractions (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray analysis (EDX). It was determined that pitch took the first place in a series of effectiveness in decreasing the content of harmful compounds in pyrolysis products; novolac was the second. A temperature of 370 °C (CTP) lowers the contribution of compounds with carbonyl groups (by approx. 2.7 times) and the contribution of alcohols, phenols, and esters (by approx. 4.4 times). At a temperature of 465 °C, this additive reduces the contribution of saturated and unsaturated hydrocarbons in the composition of volatiles (by approx. 5.8 times) and at a temperature of 520 °C, a more substantial decrease is observed (by approx. 14.3 times). During the pyrolysis in the temperature range of 420–520 °C, LDPE actively emits its own products of decomposition in the form of aliphatic hydrocarbons that negatively affect the environment. The composition of condensed pyrolysis products changes under the influence of additives. In water condensates, the concentration of determined phenols and anhydrosugars increases slightly under the influence of additives. The SEM and XRD investigations proved that inorganics interact with volatile pyrolysis products from the blends of pea husks with additives and change their composition. After the transformation of chemical composition, inorganics catalyse secondary reactions that take place in the pyrolysis products of blends.

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Section: Pyrolysis Of Ph Samples With Ctp Nl and Ldpe Additivessupporting

confidence: 59%

Section: Phmentioning

confidence: 99%

An Analysis of the Influence of Low Density Polyethylene, Novolac, and Coal Tar Pitch Additives on the Decrease in Content of Impurities Emitted from Densified Pea Husks during the Process of Their Pyrolysis

2023

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“…Due to the high thermal conductivity of heat carriers, the energy necessary for rapid pyrolysis was transferred to the biomass. The generated vapors are quickly directed to the condensation in order to minimize the reaction time, and the produced char was separated from the heat carrier independently of the thermal decomposition reaction [98,99]. The mechanism of action in the ablative pyrolysis reactor (figure 5) was compared to "melting butter in a pan", the melting rate could be greatly accelerated by pressing and sliding it against the heated surface of the pan.…”

Section: Pyrolitic Reactors -The Technical Aspects and Influence On T...mentioning

confidence: 99%

Pyrolysis of Waste Biomass – Technical and Process Achievements, and Future Development – A Review

Igliński¹,

Kujawski²,

Kiełkowska³

2023

Preprint

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Pyrolysis has been applied in the human economy for many years, and it has become a significant alternative to the production of chemical compounds, including biofuels. The article focuses mostly on recent achievements in the technical and processing aspects of pyrolysis. This review provides an overview of the recent advanced pyrolysis technology used in gas, bio-oil, and biochar production. The key parameters to maximize the production of specific chemical compounds were discussed and considered during the construction of the reactors. The emphasis is put on optimizing the process parameters, technical requirements, and renewable energy use in the process and conception to improve the efficiency of product production. The application of pyrolysis gas, oil, and biochar as valuable chemical compounds are related to the intensifying effects of climate change, biofuel production, and waste management in accordance with the principles of sustainable development.

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“…Information on the existence of interactions between the volatile products of pyrolysis and the formed char can be found in other publications [ 38 , 73 , 74 , 75 , 76 , 77 ]. Yang et al [ 38 ] analyzed the secondary reactions between the volatile and solid products of cellulose, hemicellulose, and lignin.…”

Section: Interactions Between Products Formed During Pyrolysis Processmentioning

confidence: 99%

“…As a result of the interaction with water vapor, oxygen-containing functional groups are formed only on the surface of the char, which causes the destruction of tar during the interaction between volatiles and char. According to Gao et al [ 75 ], the interactions between the volatile products and char (at the same time) during the pyrolysis of poplar wood cause an increase in yield of both solid (i.e., char and ash) and gaseous products and a decrease in the yield of liquid products. The structure of the pores in char plays a very important role in this interaction.…”

Section: Interactions Between Products Formed During Pyrolysis Processmentioning

confidence: 99%

Analysis of Interactions Occurring during the Pyrolysis of Lignocellulosic Biomass

Bielecki

Zubkova

2023

Molecules

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This paper presents a review of the recent advances in research on the interactions between the components of lignocellulosic biomass. The literature reports on the effects of interaction between lignocellulosic biomass components, such as cellulose–lignin, lignin–hemicellulose, and hemicellulose–cellulose, were discussed. The results obtained by other researchers were analyzed from the viewpoint of the interactions between the pyrolysis products formed along with the impact effects of the organic and inorganic components present or added to the biomass with regard to the yield and composition of the pyrolysis products. Disagreements about some statements were noted along with the lack of an unequivocal opinion about the directivity of interactions occurring during biomass pyrolysis. Based on the data in the scientific literature, it was suggested that the course of the pyrolysis process of biomass blends can be appropriately directed by changes in the ratio of basic biomass components or by additions of inorganic or organic substances.

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Volatile-char interactions during biomass pyrolysis: Reactor design toward product control

Cited by 24 publications

References 29 publications

An Analysis of the Influence of Low Density Polyethylene, Novolac, and Coal Tar Pitch Additives on the Decrease in Content of Impurities Emitted from Densified Pea Husks during the Process of Their Pyrolysis

An Analysis of the Influence of Low Density Polyethylene, Novolac, and Coal Tar Pitch Additives on the Decrease in Content of Impurities Emitted from Densified Pea Husks during the Process of Their Pyrolysis

Pyrolysis of Waste Biomass – Technical and Process Achievements, and Future Development – A Review

Analysis of Interactions Occurring during the Pyrolysis of Lignocellulosic Biomass

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