Autothermal pyrolysis of biomass due to intrinsic thermal decomposition effects

Tabakaev, Roman; Astafev, Alexander; Dubinin, Yu. V.; Yazykov, N. A.; Заворин, Александр Сергеевич; Yakovlev, V. А.

doi:10.1007/s10973-018-7562-7

Cited by 19 publications

(6 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Another important characteristic required to develop mathematical models of physical and chemical processes during gel fuel ignition and apply them in real life is the heat of combustion. The evaluation of combustion heat ( Q ) of the prepared oil-filled cryogel compositions was performed using an ABK-1 calorimeter (RET, Russia) . The device was first calibrated: reference measurements of combustion heat for the standard samples of benzoic acid K-3 (State Standard Sample (SSS) 5504-90) were taken.…”

Section: Experimental Investigation and Resultsmentioning

confidence: 99%

“…The evaluation of combustion heat (Q) of the prepared oil-filled cryogel compositions was performed using an ABK-1 calorimeter (RET, Russia). 34 The device was first calibrated: reference measurements of combustion heat for the standard samples of benzoic acid K-3 (State Standard Sample (SSS) 5504-90) were taken. In the case of satisfactory results on the SSS, the samples under examination with a mass of 0.4 g were attached on a wire and placed in a calorimetric vessel which was filled with oxygen until the pressure was 3 MPa.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

See 1 more Smart Citation

Oil-Filled Cryogels: New Approach for Storage and Utilization of Liquid Combustible Wastes

Vershinina

Glushkov

Nigay

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

A method of preparing oil-filled cryogels on the basis of an aqueous solution of poly(vinyl alcohol) (PVA) has been elaborated. The stability of primary oil emulsions and their rheological properties were analyzed for 30 days, as well as the mechanical properties of gel fuel pellets (obtained after 15 cycles of freezing/thawing of oil emulsions) with size of 20 mm for a group of compositions: 100−20 vol % aqueous solution of PVA (5, 10 wt %) + 0−80 vol % oil. The rheological behavior of non-Newtonian oil emulsions is described by the Herschel−Bulkley model. The elastic moduli and the tensile strength of fuel pellets of different component compositions range from 0.7 to 7.6 kPa and from 2.5 to 60 kPa, respectively. The oleophilic properties are more distinct for gel fuel prepared from oil emulsions with a higher content of the dispersed phase and lower concentrations of the polymer in the dispersion medium. The ignition mechanism and combustion characteristics have been established for processes occurring under the conditions of a radiant heat supply. Gel fuels, unlike combustible liquids, are characterized by a longer induction period, but a multicomponent structure of fuel caused microexplosions that enhance the combustion process.

show abstract

Section: Experimental Investigation and Resultsmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Oil-Filled Cryogels: New Approach for Storage and Utilization of Liquid Combustible Wastes

Vershinina

Glushkov

Nigay

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Since the water specific heat capacity (cp,w) variation is very small with the increase in temperature, we assumed in this study as a constant value of 4187 J/kg K, as reported in the literature [14], [19], [20]. For the enthalpy of water evaporation (Hw), was adopted the equation ( 7), obtained through thermodynamic properties tables and diagram of water and steam for the temperature range between 289 and 443 K [20].…”

Section: Determination Of Heat Flow From Water Contributionsmentioning

confidence: 99%

“…Besides that, according to Tabakaev et al [14], the heat required for the heating and evaporation of moisture can represent from 19% to 32% of the total heat of pyrolysis. The dehydration is predominantly endothermic and demanding heat supply from external sources.…”

mentioning

confidence: 99%

Heat flow and speciﬁc heat capacity in the dehydration stage of biomasses pyrolysis through thermal analyses

2023

View full text Add to dashboard Cite

This study aims to investigate the influence of the moisture of energy cane and coconut fiber on heat flow and specific heat capacity in the dehydration stage from the pyrolysis process. The experiments were carried out in a simultaneous thermogravimetry and differential scanning calorimetry analyzer using a heating rate of 20 K/min in an inert atmosphereThree decomposition stages were identified: dehydration (marked by an expressive endothermic peak), pyrolysis, and carbonization). From the analyses of the water contributions, it was observed that the heat flow from the heat capacity of remaining water (Qwc) is negligible compared to the heat flow from the water evaporation (Qwe), for both biomasses. Also, we calculated the heat flow from the heat capacity (Qb) and the experimental specific heat capacity (cp,b) of biomasses such as 686-2371 J/kg K and 1076-2113 J/kg K, respectively. Then, for the dehydration stage, third- and fourth-order theoretical polynomial equations have been proposed to predict the heat required for the biomass heating.

show abstract

“…Экзотермический характер протекания процесса пиролиза может быть использован для его проведения в автотермическом режиме. В работе [35] показано, что при условии предварительной сушки биомассы до значений влажности 9.5-20% возможна организация процесса пиролиза за счет собственного тепловыделения при величине теплового эффекта, составляющей более 776.7 кДж/кг.…”

Section: обсуждение результатовunclassified

Research of Wheat Bran and Products of Their Pyrolysis for Evaluation of Energy Use Possibility

Владимирович¹,

Андреевна²,

Талгатовна³

et al. 2020

JCPRM

View full text Add to dashboard Cite

The aim of the work is research thermal characteristics of bran and products of pyrolytic processing to evaluation the possibility of their use as a fuel. As research methods, experiments were used to determine the yield of pyrolysis products and their characteristics, as well as differential thermal analysis. Thermotechnical characteristics of raw materials are determined by АСТМ Е1755-01, ISO 589:2008, ISO 5071-1:2013 and a bomb calorimeter ABK-1 (RET, Russia). The elemental composition of the raw materials is determined by the Vario Micro Cube analyzer (Elementar, Germany). In result of the work is established that wheat bran has a high heat of combustion (16.6 MJ/kg) for biomass and a high yield of volatile (81%). The ash content of raw materials was 6.9%, herewith the ash residue has a sintered character at temperatures above 725 °C, which indicates the slag ability. The active stage of bran decomposition proceeds in a temperature range 225–500 °C, that established by means of the differential thermal analysis. The results of material balance determination showed that the carbon residue (43%) has a predominant yield from the raw materials, the share of pyrogenetic water is 29%, which is due to the exothermic reactions in the bran during heating, resin – 12%, gas – 16%. The CO2 and CO concentrations are dominated in composition of pyrolysis gas during a heating temperature to 350 °C, which is associated with the decomposition of the main components in the bran – cellulose and hemicellulose. The methane concentration begins to increase after 350 °C and reaches a maximum at 450 °C, the decomposition of thermally more resistant lignin was occured at these temperatures. The maximum gas heat of combustion (9.3 MJ/m3) was associated to the peak of methane concentration in gas.

show abstract

Autothermal pyrolysis of biomass due to intrinsic thermal decomposition effects

Cited by 19 publications

References 69 publications

Oil-Filled Cryogels: New Approach for Storage and Utilization of Liquid Combustible Wastes

Oil-Filled Cryogels: New Approach for Storage and Utilization of Liquid Combustible Wastes

Heat flow and speciﬁc heat capacity in the dehydration stage of biomasses pyrolysis through thermal analyses

Research of Wheat Bran and Products of Their Pyrolysis for Evaluation of Energy Use Possibility

Contact Info

Product

Resources

About