Thermogravimetric analysis of the co-pyrolysis of a bituminous coal and pulp mill sludge

Abstract

Thermal valorization of organic wastes by coprocessing with coal may be a management option for such wastes. In this work, the separate pyrolysis of coal and primary and secondary pulp mill sludge was assessed by thermogravimetric (TG) analysis. Then, under the same experimental conditions, the pyrolysis TG curves of the coal blends with a 10 mass% of either primary or secondary pulp mill sludge were obtained. The corresponding differential thermogravimetry curves made evident that the devolatilization of coal starts at higher temperature and reaches higher char yields than that of primary or secondary paper mill sludge. Under blending, lower devolatilization temperatures and char yields, close to the weighted calculated ones, are observed. Non-isothermal kinetic analysis showed that the Arrhenius activation energy (E) corresponding to the pyrolysis of coal was lower than that corresponding to either L1 or L2. Moreover, lower E than the weighted calculated ones was determined for the co-pyrolysis of the blends.

Thermal Behavior Prediction of Sludge Co-Combustion with Coal: Curve Extraction and Artificial Neural Networks

“…The extent of the synergistic effect varies with the blend ratio of sludge and coal. Notably, the synergistic effect of co-combustion has a differen impact on various temperature ranges, consistent with earlier findings [25,26]. Coimbr al.…”

Thermal properties of group components of the pitch–PET compositions

“…Pyrolysis and the accompanying evolution of volatile fractions can be associated with destruction of DSC/mW mg -1 hydrocarbons, partial abstraction of functional groups, formation of simple compounds CO 2 and CH 4 , condensation and polymerization of resulting particles [16][17][18]. In the process of thermal decomposition of pitch-polymer compositions, reactions may occur between decompositions products of CTP and PET.…”

Non-Isothermal Pyrolysis Kinetic Studies of Kraft Pulp Mill Sludge and Its Blending with Coal Powder

“…Pyrolysis is a thermal decomposition of organic compounds at elevated temperatures in an inert environment where the main products are including non-condensable gases, liquid bio-oils as well as solid char (Liu, Song, and Wu, 2015). Potential energy resources in the form of fuels come from the gaseous and liquid products, whereas the solid product may be used as an adsorbent for pollutants removal of contaminated water (Coimbra et al, 2015). Pyrolysis, in addition to being an independent process for producing various chemical compounds and fuels, may also be considered as the initial stage of thermal conversion process of carbonaceous materials, including combustion and gasification (Fang et al, 2015).…”

“…This process may lead to a variation in the thermal reactivity of the blended materials and on the physical properties and chemical properties of the product generated. Recently, a number of studies have reported the co-pyrolysis characteristics of sludges (Fang et al (2015); Coimbra et al (2015); Xiao et al (2015); Wang et al (2016). Fang et al (2015) studied thermogravimetric analysis of the co-pyrolysis of paper sludge and municipal solid waste through a thermogravimetric simultaneous thermal analyzer from room temperature to 1000 o C. It was reported that with the increase of paper sludge ratio, the mass loss peak was also increased.…”

“…Fang et al (2015) studied thermogravimetric analysis of the co-pyrolysis of paper sludge and municipal solid waste through a thermogravimetric simultaneous thermal analyzer from room temperature to 1000 o C. It was reported that with the increase of paper sludge ratio, the mass loss peak was also increased. Coimbra et al (2015) studied thermogravimetric analysis of the copyrolysis of a bituminous coal and pulp mill sludge. The paper reported that compared to coal, pyrolysis of pulp mill sludge may started at lower temperatures and involving larger devolatilization and produced smaller yield of char.…”