Quality of deposits during grate combustion of corn stover and wood chip blends

Aho, Martti; Paakkinen, Kari; Taipale, Raili

doi:10.1016/j.fuel.2012.05.057

Cited by 33 publications

(29 citation statements)

References 26 publications

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“…On the basis of the analyzed SO 2 concentrations over time, a fractional conversion of sulfur in the sulfate to SO 2 under the given temperature condition was calculated. The remaining sulfur in sulfate is assumed to be released as SO 3 . The temperature range chosen for ammonium sulfate and aluminum sulfate studied was 600−900°C, where the conversion of SO 3 to SO 2 is expected to be negligible in the absence of free radicals.…”

Section: Methodsmentioning

confidence: 99%

Modeling the Use of Sulfate Additives for Potassium Chloride Destruction in Biomass Combustion

Pedersen

Jespersen

et al. 2013

Energy Fuels

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Potassium chloride, KCl, formed from biomass combustion may lead to ash deposition and corrosion problems in boilers. Sulfates are effective additives for converting KCl to the less harmful K 2 SO 4 and HCl. In the present study, the rate constants for decomposition of ammonium sulfate and aluminum sulfate were obtained from experiments in a fast heating rate thermogravimetric analyzer. The yields of SO 2 and SO 3 from the decomposition were investigated in a tube reactor at 600−900°C , revealing a constant distribution of about 15% SO 2 and 85% SO 3 from aluminum sulfate decomposition and a temperaturedependent distribution of SO 2 and SO 3 from ammonium sulfate decomposition. On the basis of these data as well as earlier results, a detailed chemical kinetic model for sulfation of KCl by a range of sulfate additives was established. Modeling results were compared to biomass combustion experiments in a bubbling fluidized-bed reactor using ammonium sulfate, aluminum sulfate, and ferric sulfate as additives. The simulation results for ammonium sulfate and ferric sulfate addition compared favorably to the experiments. The predictions for aluminum sulfate addition were only partly in agreement with the experimental results, implying a need for further investigations. Predictions for the effectiveness of the sulfur-based additives indicate that ferric sulfate and ammonium sulfate have similar effectiveness at temperatures ranging from approximately 850 to 900°C, whereas ferric sulfate is more efficient at higher temperatures and ammonium sulfate is more effective at lower temperatures.

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Section: Methodsmentioning

confidence: 99%

Modeling the Use of Sulfate Additives for Potassium Chloride Destruction in Biomass Combustion

Pedersen

Jespersen

et al. 2013

Energy Fuels

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“…Trninic et al [14] reveal the detailed kinetics about corncob pyrolysis, and emphasize the possibilities of a common kinetic model for the pyrolysis of most agricultural byproduct. Aho et al [15] investigate the quality of deposits during grate combustion of corn stover and wood chip blends. Wang et al [16] reveal that there are interactions during co-pyrolysis of corncob and lignite blends, which increase overall tar yields and decrease overall gas yields compared with those obtained from pyrolysis of unblended feedstocks.…”

Section: Introductionmentioning

confidence: 99%

Combustion behavior of corncob/bituminous coal and hardwood/bituminous coal

2015

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a b s t r a c tThe combustion performance of two typical herbaceous and woody samples (corncob and hardwood) and bituminous coal is evaluated using a thermal analysis technique. The biomasses show better ignition performance, volatile matter release performance and comprehensive combustion performance than those of the bituminous coal. With increasing the heating rates, the performances of corncob, hardwood and biomass/coal blends get obviously improved. The dominant mechanisms associated with combustion kinetics for corncob and most corncob/coal blends at pre-peak and post-peak are described by the AvramieErofeev equations (n ¼ 3 or n ¼ 4). The dominant mechanisms associated with combustion kinetics for hardwood and hardwood/coal blends at pre-peak are described by the AvramieErofeev equations (n ¼ 3 or n ¼ 4) or Z-L-T equation (n ¼ 2). The dominant mechanisms associated with combustion kinetics for hardwood and hardwood/coal blends at post-peak are described by the Avrami eErofeev equations (n ¼ 3 or n ¼ 4). The dominant mechanisms of combustion for bituminous coal during the pre-peak and post-peak period are determined to be the reaction order equations. Some significant synergistic interactions are detected between Chinese bituminous coal and corncob or hardwood, especially for all corncob/coal blends at heating rate of 90 C/min and 80Cc20C blend at heating rate of 70 C/min during the co-combustion.

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“…Herbaceous material regularly contains considerable amounts of Cl. Hensgen et al [25], for instance, measured Cl concentrations of about 0.4% DM in semi-natural grassland and Aho et al [26] report Cl concentrations of about 0.5% DM in both wheat straw and corn stover.…”

Section: Suitability Of Raw Materials and Press Cakes For Combustionmentioning

confidence: 99%

Energy Generation from Horse Husbandry Residues by Anaerobic Digestion, Combustion, and an Integrated Approach

2017

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Horse-related activities often occur close to urban areas, where acreage for horse manure disposal is scarce, and subsequently alternative recovery options are necessary. Anaerobic digestion, direct combustion, and the integrated generation of solid fuel and biogas from biomass (IFBB) process are potential techniques focusing on energy provision. In this study, samples of horse faeces were analysed for chemical composition as pure feedstock and in mixture with straw or wood shavings, as well as for energy yield by biogas production or from combustion of solid fuel. It was observed that chemical properties of faeces, in a mixture with wood shavings, were promising for direct combustion, but achieved low methane yields. The methane yield of pure faeces and the straw mixture was 222.33 ± 13.60 and 233.01 ± 31.32 l N ·kg −1 volatile solids (VS) added , respectively. The IFBB process divided the biomass into a press cake with reduced mineral concentration and a press fluid. Methane yields of press fluids were low (108.2 l N ·kg −1 VS added , on average). The chemical composition of the press cake allowed for combustion and led to a higher gross energy potential than anaerobic digestion (two-fold higher for pure manure and the mixture with straw, and five-fold higher for the mixture with shavings). Consequently, the gross energy potential of IFBB is higher compared to anaerobic digestion, however it should be noted that local conditions might favour the implementation of anaerobic digestion.

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Quality of deposits during grate combustion of corn stover and wood chip blends

Cited by 33 publications

References 26 publications

Modeling the Use of Sulfate Additives for Potassium Chloride Destruction in Biomass Combustion

Modeling the Use of Sulfate Additives for Potassium Chloride Destruction in Biomass Combustion

Combustion behavior of corncob/bituminous coal and hardwood/bituminous coal

Energy Generation from Horse Husbandry Residues by Anaerobic Digestion, Combustion, and an Integrated Approach

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