Pathway of biomass-potassium migration in co-gasification of coal and biomass

Song, Yuncai; Li, Qiao-tong; Li, Fangzhou; Wang, Lai-song; Hu, Changchun; Feng, Jie; Li, Wenying

doi:10.1016/j.fuel.2018.11.023

Cited by 50 publications

(11 citation statements)

References 32 publications

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“…To avoid the copyrolysis interaction, SM and CS were placed separately in a horizontal furnace to prepare char samples. The preparation of char is based on the work of Chen et al The contents of AAEMs and volatile matter in biomass char decrease with increasing pyrolysis temperature . Biomass AAEMs are beneficial to the cogasification reaction, while the volatile matter is the opposite.…”

Section: Methodsmentioning

confidence: 99%

“…The preparation of char is based on the work of Chen et al 18 The contents of AAEMs and volatile matter in biomass char decrease with increasing pyrolysis temperature. 24 Biomass AAEMs are beneficial to the cogasification reaction, while the volatile matter is the opposite. The pyrolysis temperature was 800 °C to ensure the gasification reactivity of CS and SM blended char.…”

Section: Methodsmentioning

confidence: 99%

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Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

et al. 2020

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The cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 was evaluated by a fixed-bed/fluidized-bed reactor and mass spectrometry. The effects of blend ratio, gasification temperature, and CS char volatiles on the cogasification reactivity were characterized by a synergistic index. The results show that the interaction of the cogasification char with low temperature and low CS blend ratio changed from inhibition to promotion with the increasing conversion. The increase of the CS blend ratio and gasification temperature can weaken the inhibition and enhance the synergy. Furthermore, CS volatile–potassium (K) could promote the cogasification reaction, and the promotion effect increases with the rise of temperature. Finally, the cogasification reactivities of CS–SM blend char and CS char volatiles–SM char were compared. The results demonstrate that the reaction form of CS char volatiles–SM char has a better effect on improving gasification reactivity when alkali and alkaline earth metals are not melted. Otherwise, the reaction form of the CS–SM blend char performs better.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

et al. 2020

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“…[60] concluded that co-pyrolysis under moderate temperature strongly favored inhibiting potassium from releasing, probably by interfering with free radical reactions. Song et al [61] researched the migration path of K in biomass during thermal co-processing of coal and biomass (see Figure 4), and found that the mixed raw materials released 84.1 wt% (coal char 65.0 wt%, biochar 19,1 wt%) of biomass-K into the co-pyrolysis char, while only 15.9 wt% of biomass-K was released into the gas phase. The biomass-K migrated from the biomass to the coal char, and biochar was in the water-soluble (6.6 and 11.2 wt %, respectively), acetic acid-soluble (0.9 and 1.4 wt%, respectively), H 2 SO 4 -soluble (8.5 and 1.5 wt%, respectively), and H 2 SO 4 -insoluble (49.0 and 5.0 wt%, respectively) forms.…”

Section: Release and Migration Of Aaems From Biomass To Coal During Co-pyrolysis/co-gasificationmentioning

confidence: 99%

Progress on the Co-Pyrolysis of Coal and Biomass

Chen¹,

Zhang²,

Liu³

et al. 2022

Biorefineries - Selected Processes

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In this chapter, the synergistic mechanism and the resulting influence during co-pyrolysis of coal and biomass, are summarized. The properties of coal and biomass, the release and migration of alkali and alkaline earth metals (AAEMs), the interaction between volatile and char, the characteristics of the resulting volatiles, and the physicochemical structure and reactivity of co-pyrolysis char, are also analyzed. In addition, the influence of AAEMs on the properties of the co-pyrolysis products is reviewed. Moreover, the analysis of the co-pyrolysis industry demonstration is also mentioned. Finally, this chapter also proposes some additional possibilities, based on further literature research.

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“…Compared with some works in the literature [14,19], CSC has a high content of K. After water-leaching treatment, the contents of the inorganic elements all decreased, and the mass fraction of K and Na dropped dramatically. The primary chemical form of K and Na in biomass char is water-soluble [14,34], so the water-leaching treatment caused a massive loss of K and Na.…”

Section: Preparation Of Char Samplesmentioning

confidence: 99%

Experimental and Kinetic Studies on Steam Gasification of a Biomass Char

et al. 2021

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The maximum gasification rate of corn stalk char (CSC) appeared at high conversion range, and its quite different gasification behaviors from other carbonaceous materials are all derived from the catalytic effect of alkali and alkali earth metals (AAEMs), so it is necessary to study the effect of AAEMs and gasification kinetics of such biomass char. However, there are few systematic discussions about this effect and kinetic modeling. Thus, in this study, CSC samples were prepared in a fast pyrolysis fixed-bed reactor, and its gasification experiments were conducted on a pressurized magnetic suspension balance at various total pressures (0.1–0.7 MPa), steam concentrations (10–70 vol.%) and temperatures (725–900 °C). Moreover, a water-leached CSC (H2O-CSC) was also prepared to evaluate the impact of AAEMs on the gasification performance of CSC, and some well-known models were adopted to describe the gasification behaviors. On the basis of these results, the effect of primary AAEMs on the gasification behaviors of CSC and gasification kinetic modeling were obtained. Results showed total pressure had no obvious influence on the gasification rate of CSC, and the reaction order varied at 0.43–0.55 with respect to steam partial pressures. In addition, the modified random pore model (MRPM) and Langmuir–Hinshelwood (L-H) model were satisfactorily applied to predict the gasification behaviors of CSC. The catalytic effect of AAEMs on CSC gasification was weakened due to water-leaching treatment. A random pore model (RPM) could describe the gasification behavior of H2O-CSC well, followed by grain model (GM) and volumetric model (VM).

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Pathway of biomass-potassium migration in co-gasification of coal and biomass

Cited by 50 publications

References 32 publications

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

Study on Reactivity and Synergy Behavior of Cogasification between Biomass Char and Coal Char

Progress on the Co-Pyrolysis of Coal and Biomass

Experimental and Kinetic Studies on Steam Gasification of a Biomass Char

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