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2003
Gea, Gloria; Murillo, María Benita; Sánchez, José Luis; Bilbao, Rafael; Arauzo, Jesús
Straw black liquor gasification studies at the University of Zaragoza Artículo de revista
En: Pulp and Paper Canada, vol. 104, no 3, pp. 44–48, 2003.
@article{Gea2003a,
title = {Straw black liquor gasification studies at the University of Zaragoza},
author = {Gloria Gea and María Benita Murillo and José Luis Sánchez and Rafael Bilbao and Jesús Arauzo},
url = {https://www.osti.gov/etdeweb/biblio/20341706},
year = {2003},
date = {2003-01-01},
journal = {Pulp and Paper Canada},
volume = {104},
number = {3},
pages = {44--48},
abstract = {Results of studies on the thermal behaviour of straw black liquor and fluidized bed gasification are discussed. Agglomeration of the bed and low gas yield, coupled with high tar formation, was observed during fluidized bed gasification. To avoid agglomeration a spouted bed reactor was used and the black liquor was pretreated to reduce its swelling. Attempt were made to reduce tar formation by adding a secondary catalyst (NiAlsub 2Osub 4) to the fluidized bed which is known to be useful in cracking tars formed during the pyrolysis stage. Results of selected additional studies on several variables such as the furnace temperature and gas composition on the swelling of a soda straw black liquor are also included},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Results of studies on the thermal behaviour of straw black liquor and fluidized bed gasification are discussed. Agglomeration of the bed and low gas yield, coupled with high tar formation, was observed during fluidized bed gasification. To avoid agglomeration a spouted bed reactor was used and the black liquor was pretreated to reduce its swelling. Attempt were made to reduce tar formation by adding a secondary catalyst (NiAlsub 2Osub 4) to the fluidized bed which is known to be useful in cracking tars formed during the pyrolysis stage. Results of selected additional studies on several variables such as the furnace temperature and gas composition on the swelling of a soda straw black liquor are also included
2002
Gea, Gloria; Murillo, María Benita; Arauzo, Jesús
Thermal degradation of alkaline black liquor from straw. Thermogravimetric study Artículo de revista
En: Industrial and Engineering Chemistry Research, vol. 41, no 19, pp. 4714–4721, 2002, ISSN: 08885885.
@article{Gea2002,
title = {Thermal degradation of alkaline black liquor from straw. Thermogravimetric study},
author = {Gloria Gea and María Benita Murillo and Jesús Arauzo},
url = {https://pubs.acs.org/sharingguidelines},
doi = {10.1021/ie020283z},
issn = {08885885},
year = {2002},
date = {2002-09-01},
journal = {Industrial and Engineering Chemistry Research},
volume = {41},
number = {19},
pages = {4714--4721},
publisher = {American Chemical Society},
abstract = {Both pyrolysis and gasification can be considered as alternatives to conventional boilers for recovering chemicals and energy from black liquor. The present work is focused on the study of pyrolysis of alkaline black liquor from straw, and its interest is enhanced by the fact that the material used has hardly been studied before. The influence has been studied of the final pyrolysis temperature (500-900 °C), the heating rate (5-30 °C/min), and the addition of a determined CO concentration in the N2 atmosphere (5-40% vol) on both the final solid conversion and the devolatilization rate. The results show that the thermal decomposition of the organic matter fraction of black liquor takes place at temperatures below 550 °C in N2 atmosphere. The weight loss observed at temperatures higher than 550 °C is mainly due to reduction reactions of alkaline compounds by the carbon. The final solid conversion and the devolatilization rate are also noticeably influenced by the addition of a certain CO flow rate in N2 atmosphere.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Both pyrolysis and gasification can be considered as alternatives to conventional boilers for recovering chemicals and energy from black liquor. The present work is focused on the study of pyrolysis of alkaline black liquor from straw, and its interest is enhanced by the fact that the material used has hardly been studied before. The influence has been studied of the final pyrolysis temperature (500-900 °C), the heating rate (5-30 °C/min), and the addition of a determined CO concentration in the N2 atmosphere (5-40% vol) on both the final solid conversion and the devolatilization rate. The results show that the thermal decomposition of the organic matter fraction of black liquor takes place at temperatures below 550 °C in N2 atmosphere. The weight loss observed at temperatures higher than 550 °C is mainly due to reduction reactions of alkaline compounds by the carbon. The final solid conversion and the devolatilization rate are also noticeably influenced by the addition of a certain CO flow rate in N2 atmosphere.
2001
Puértolas, Rosa; Gea, Gloria; Murillo, María Benita; Arauzo, Jesús
Pyrolysis of black liquors from alkaline pulping of straw. Influence of a preoxidation stage on the char characteristics Artículo de revista
En: Journal of Analytical and Applied Pyrolysis, vol. 58-59, pp. 955–966, 2001, ISSN: 01652370.
@article{Puertolas2001,
title = {Pyrolysis of black liquors from alkaline pulping of straw. Influence of a preoxidation stage on the char characteristics},
author = {Rosa Puértolas and Gloria Gea and María Benita Murillo and Jesús Arauzo},
doi = {10.1016/S0165-2370(00)00175-3},
issn = {01652370},
year = {2001},
date = {2001-04-01},
journal = {Journal of Analytical and Applied Pyrolysis},
volume = {58-59},
pages = {955--966},
publisher = {Elsevier},
abstract = {New alternative processes such as low temperature gasification are currently being developed in order to use of black liquors from pulp and paper mills with energy proposes. The development of these new processes makes necessary to study the behavior of black liquors during pyrolysis and gasification paying special attention on their thermoplastic properties, which can cause important operational problems due to its swelling when heated. Present work is focused to the study of pyrolysis of alkaline black liquors from pulping of straw. The influence of an oxidation stage at low temperature previous to pyrolysis, on specific surface area of the char and on the black liquor swelling, is studied. For that, two main variables are analyzed: time of preoxidation and final temperature of pyrolysis. Dry black liquors from alkaline pulping of straw were used as material. The resulting chars obtained showed a clear decrease in swelling level of the black liquors, as well as an increase on their specific surface area, within the pyrolysis temperature and the preoxidation time. Materials with specific surface areas varying from 2 up to nearly 500 m2 g-1 can be produced with the correct choice of experimental conditions. From the results, further research on the influence of a preoxidation stage on black liquors may lead to a better understanding of new alternative processes, which are nowadays being developed. textcopyright 2001 Elsevier Science B.V.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
New alternative processes such as low temperature gasification are currently being developed in order to use of black liquors from pulp and paper mills with energy proposes. The development of these new processes makes necessary to study the behavior of black liquors during pyrolysis and gasification paying special attention on their thermoplastic properties, which can cause important operational problems due to its swelling when heated. Present work is focused to the study of pyrolysis of alkaline black liquors from pulping of straw. The influence of an oxidation stage at low temperature previous to pyrolysis, on specific surface area of the char and on the black liquor swelling, is studied. For that, two main variables are analyzed: time of preoxidation and final temperature of pyrolysis. Dry black liquors from alkaline pulping of straw were used as material. The resulting chars obtained showed a clear decrease in swelling level of the black liquors, as well as an increase on their specific surface area, within the pyrolysis temperature and the preoxidation time. Materials with specific surface areas varying from 2 up to nearly 500 m2 g-1 can be produced with the correct choice of experimental conditions. From the results, further research on the influence of a preoxidation stage on black liquors may lead to a better understanding of new alternative processes, which are nowadays being developed. textcopyright 2001 Elsevier Science B.V.