Abstract
Slow pyrolysis of a pellet of pistachio waste was studied using a macro-thermogravimetric analysis. Experiments were conducted at different heating rates (5, 10, and 15 K/min), measuring the evolution of mass weight loss and CO release. Based on a dimensionless number analysis, a numerical model was formulated, comprising heat and mass balances. A kinetic expression for the release of CO was proposed. Additionally, a 3-E (environmental, exergetic, and energetic) analysis for the processing of 20 kg/h of bio-waste (case study) was applied. Experimental results showed that biochar and gas yields decreased with an increase in the heating rate (43 to 36% and 28 to 24%, respectively), while the bio-oil yield increased (29 to 40%). The slow pyrolysis model presented a good agreement with experimental results of weight loss. Furthermore, a comparison with the contracting volume model showed that internal heat transport should control the global process. The proposed kinetic model for CO release showed a good fit to experimental data, where activation energy values were 29.88 (5 K/min), 17.44 (10 K/min), and 28.79 kJ/mol (15 K/min). Finally, from the 3-E analysis and the experimental results, it can be suggested that an increase in the heating rate resulted in a higher pyrolysis exergetic efficiency (70%). It is due to an increase in the bio-oil yield with high-energy content.
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Data availability
The datasheets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request. Characteristics of used materials are also available on request.
Abbreviations
- A b :
-
Pre-exponential factor for bio-waste decomposition, s−1
- A CO :
-
Pre-exponential factor for CO release, s−1
- b :
-
Geometric factor, dimensionless
- Cbiochar :
-
Carbon content of biochar, %
- Cbio-oil :
-
Carbon content of bio-oil, %
- Cbio-waste :
-
Carbon content of bio-waste, %
- Cpg :
-
Gas heat capacity, J/(kg K)
- Cpi :
-
Gas heat capacity of i-th gaseous specie, J/(kmol K)
- Cpj :
-
Gas heat capacity of j-th reagent, J/(kmol K)
- Cpk :
-
Gas heat capacity of k-th inert species, J/(kmol K)
- Cpm :
-
Gas heat capacity of m-th product, J/(kmol K)
- CpP :
-
Pellet heat capacity, J/(kg K)
- F CO :
-
Volumetric flow of CO release, m3/s
- h conv :
-
Convective heat transfer coefficient, J/(kg m.2 s K)
- H biochar :
-
Hydrogen content of biochar, %
- H bio-oil :
-
Hydrogen content of bio-oil, %
- H bio-waste :
-
Hydrogen content of bio-waste, %
- HHV :
-
Higher heating value, MJ/Kg
- HHV bio-waste :
-
Higher heating value of bio-waste, MJ/kg
- HHV m :
-
Higher heating value of m-th product of pyrolysis, MJ/kg
- I RE :
-
Energy index, dimensionless
- K :
-
\(=\frac{{\lambda }_{{P}}}{{\uprho }_{{P}}{{C}}_{{{p}}_{{p}}}}\); Thermal diffusivity, m2/s
- L C :
-
Characteristic length, m
- LHV m, prod :
-
Lower heating value of bio-waste, bio-oil and biochar, MJ/kg
- l P :
-
Height, m
- MW :
-
Molecular weight, kg/kmol
- MW gas :
-
Average molecular weight of gas mixture, kg/kmol
- Nu :
-
\(=\frac{{h}_{{conv}}{L}_{{C}}}{{\lambda }_{{g}}}\); Nusselt number, dimensionless
- O biochar :
-
Oxygen content of biochar, %
- O bio-oil :
-
Oxygen content of bio-oil, %
- O bio-waste :
-
Oxygen content of bio-waste, %
- Pr :
-
\(=\frac{{{C}}_{{{p}}_{{g}}}{\mu }_{{g}}}{{\uplambda }_{{g}}}\); Prandtl number, dimensionless
- Q bio-waste :
-
Energy content of bio-waste, MJ/h
- Q h :
-
Energy of heat supplied to the reactor, MJ/h
- Q m :
-
Energy content of biochar, bio-oil or gas, MJ/h
- Q recovery :
-
Recovered energy, MJ/h
- r :
-
Cylindrical coordinate (radius direction), m
- rc :
-
Radius at front of reaction, m
- R :
-
Universal gas constant, 8.3144 × 10.−3 kJ/(mol K)
- Re :
-
\(=\frac{{\uprho }_{{g}}{\nu }_{{g}}{L}_{C}}{{\mu }_{{g}}}\); Reynolds number, dimensionless
- T :
-
Temperature, K
- t :
-
Time, s
- T 0 :
-
Initial temperature, K
- T c :
-
Center temperature, K
- T fs :
-
Final surface temperature, K
- T g :
-
Gas temperature, K
- T M :
-
Middle temperature, K
- T P :
-
Pellet local temperature, K
- T s :
-
Surface temperature, K
- V P :
-
Volatile mass, kg
- v g :
-
Lineal velocity of nitrogen, m/s
- W i :
-
Mass of i-th component, kg
- W gas :
-
Mass flowrate of gas, kg/h
- W m,prod :
-
Mass flowrate of bio-waste, bio-oil or biochar, kg/h
- W P :
-
Mass pellet at the time t, kg
- W 0 :
-
Initial mass, kg
- W P∞ :
-
Mass at the time t → ∞, kg
- X m :
-
Mass yield of biochar, bio-oil or gas. dimensionless
- x i :
-
Number of moles of i-th component, kmol
- x j :
-
Number of moles of j-th reagent, kmol
- x k :
-
Number of moles of k-th inert species, kmol
- x m :
-
Number of moles of m-th product, kmol
- \({\widetilde{\upvarepsilon }}_{{{ch}}_{i}}\) :
-
Molar chemical exergy of i-th component, MJ/kmol
- \({\widetilde{\upvarepsilon }}_{{chgas}}\) :
-
Chemical exergy of gas, MJ/kmol
- ɛ:
-
System exergy, MJ/h
- ɛch :
-
Chemical exergy of system, MJ
- ɛch m,prod :
-
Chemical exergy of biochar, bio-oil or gas, MJ/h
- ɛchi :
-
Chemical exergy of i-th component, MJ/h
- ɛin :
-
Input exergy, MJ/h
- ɛph :
-
Pysical exergy of system, MJ
- ɛphgas :
-
Physical exergy of gas, MJ/h
- ɛphi :
-
Physical exergy of i-th component, MJ/h
- ɛprod :
-
Products exergy, MJ/h
- ΔH f ,i :
-
Molar formation enthalpy change of i-th gaseous component, kJ/kgmol
- ΔH f ,j :
-
Molar formation enthalpy change of j-th reagent, kJ/kgmol
- ΔH f ,k :
-
Molar formation enthalpy change of k-th inert species, kJ/kgmol
- ΔH f ,m :
-
Molar formation enthalpy change of m-th product, kJ/kgmol
- ΔH pyr :
-
Pyrolysis enthalpy, J/kg
- λg :
-
Gas conductivity of nitrogen, W/(m K)
- λP :
-
Thermal conductivity of pellet, W/(m K)
- μg :
-
Kinematic viscosity of nitrogen, kg/(m s)
- π:
-
Pi number = 3.14159
- ρ0 :
-
Initial density of bio-waste, kg/m.3
- ρg :
-
Gas density, kg/m.3
- ρP :
-
Instantaneous density of bio-waste pellet, kg/m.3
- ρP0 :
-
Density of bio-waste pellet at time t = 0, kg/m.3
- ρP ∞ :
-
Density of bio-waste pellet at time t → ∞, kg/m.3
- σ:
-
Stefan-Boltzmann constant, W/(m2 K.4)
- τ:
-
Correlation factor, dimensionless
- φ:
-
Porosity, dimensionless
- Ψ:
-
Exergy efficiency, dimensionless
- ωb :
-
Emissivity, dimensionless
- 0:
-
Initial
- \(\infty\) :
-
At time \(t\to \infty\)
- b:
-
Bio-waste
- c:
-
Center
- C:
-
Characteristic
- ch:
-
Chemical
- CO:
-
Carbon monoxide
- f:
-
Formation
- g:
-
Gas
- i:
-
Gaseous products of pyrolysis
- j:
-
Reagent
- k:
-
Inert species
- m:
-
Products of pyrolysis, biochar or bio-oil
- m,i:
-
Product (biochar, bio-oil or gas)
- P:
-
Pellet
- Phi:
-
Physical
- prod:
-
Product
- pyr:
-
Pyrolysis
- RE:
-
Recovery energy
- s:
-
Surface
- b:
-
Geometric factor
- I:
-
Inert component
- n:
-
Reaction order
- p:
-
Number of product species
- rea:
-
Reagents
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Acknowledgements
The authors wish to thank the support of the following argentine institutions: the University of San Juan, Faculty of Engineering; the University of Comahue, Faculty of Engineering; National Scientific and Technical Research Council, CONICET and ANPCyT- FONCYT.
Daniela Zalazar-Garcia has a post-doctoral fellowship from CONICET, Argentina. Anabel Fernandez, Lucas Cavaliere, José Soria, Rosa Rodriguez, and Germán Mazza are Research Members of CONICET, Argentina.
Funding
The research leading to these results received funding from the University of San Juan, San Juan, Argentina, under Grant Agreement No. PDTS Res. 1054/18 and the University of Comahue, Neuquén, Argentina, under Grant Agreement No. PIN 2022–04/I260. This study was also funded by the National Scientific and Technical Research Council, CONICET (Grant Agreements: PUE PROBIEN CONICET 22920150100067, PIP 2021–2023-No. 11220200100950CO and SYNSOLGAS Project-CONICET-MINCyT-CNRS). This work was also supported by ANPCyT-FONCYT (grant numbers PICT 2017–2047 and PICT 2019–01810).
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Conceptualization: Daniela Zalazar-Garcia, Anabel Fernandez, José Soria, Yimin Deng, Rosa Rodriguez, Germán Mazza; methodology: Daniela Zalazar-Garcia, Anabel Fernandez, Yiming Deng, Rosa Rodriguez; formal analysis and investigation: Daniela Zalazar-Garcia, Anabel Fernandez, Lucas Cavaliere, José Soria, Germán Mazza; writing—original draft preparation: Daniela Zalazar-Garcia, Anabel Fernandez; software: Daniela Zalazar-Garcia, Lucas Cavaliere; writing—review and editing: Rosa Rodriguez, Germán Mazza; funding acquisition: Rosa Rodriguez, Germán Mazza; resources: Rosa Rodriguez, Germán Mazza; project administration: Rosa Rodriguez, Germán Mazza; supervision: Germán Mazza.
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Zalazar-Garcia, D., Fernandez, A., Cavaliere, L. et al. Slow pyrolysis of pistachio-waste pellets: combined phenomenological modeling with environmental, exergetic, and energetic analysis (3-E). Biomass Conv. Bioref. 14, 9197–9215 (2024). https://doi.org/10.1007/s13399-022-03232-3
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DOI: https://doi.org/10.1007/s13399-022-03232-3