Combustion requirements for conversion of ash-rich novel energy crops in a 250 kWth multifuel grate fired system

Díaz-Ramírez, Maryori C.; Sebastián, Fernando; Rezeau, Adeline

doi:10.1016/j.energy.2012.07.029

Cited by 21 publications

(14 citation statements)

References 24 publications

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“…It is difficult to completely explain the differences in the behaviour of fuels, especially in the case between the PV and the rest of residual agricultural pellets, relying only in the chemical composition of the ashes shown in Table 2., because the phenomenon of sintering and slagging depends not only on chemical composition but also on its mineral origin [54]. Nevertheless, some important characteristics can be analyzed considering molar ratios presented in Table 4., based on earlier research studies [22]. Considering molar ratio I, Si/P, it is evident that bottom ash is Si-dominated for all mixed pellets (PVB, PVC and PVBC).…”

Section: Bottom Ashmentioning

confidence: 59%

“…In order to analyze these effects, tests can be made in commercial boilers adapted to carry them out controlled [5], [8], [21], [22], [28]- [30]. However, due to the complexity of the phenomena intervening in the fractioning of ashes, it is preferable to use laboratory reactors, most of them using fixed bed technology, in order to have better control of combustion conditions [13], [23], [31]- [34].…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the ash behaviour in combustion of pelletized residual agricultural biomass

Royo

Canalís

Quintana

et al. 2019

Fuel

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Agricultural residual biomass presents a high potential for energy use around the world, often not utilized to a large extent due to its significant differences with respect to other biomass types, such as the one of forest origin. These differences are mainly related to the characteristics of its ashes (quantity and composition) which increase certain problematic phenomena during combustion, among them bottom ash sintering and fly ash deposition. The main goal of this paper is the experimental study of these issues for four different agropellets made of residual agricultural biomass (one woody and three blended with an herbaceous component) and a forest wood pellet (used as a reference), evaluated under different operating conditions in a laboratory fixed bed reactor. The influence of inlet air flow and temperature on the sintering degree and deposition ratio has been analyzed in a systematic way. For the five biofuels, under tested conditions, a clear relation inversely proportional between air excess ratio and deposition ratio has been determined. Deposition was more substantial for the four agropellets; meanwhile the sintering degree was more important for the three with an herbaceous component. The information obtained in this research work is intended to help researchers and technologists to make choices regarding the design and operation of conversion systems adapted for agricultural residual biomass, enhancing its market penetration.

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Section: Bottom Ashmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Experimental study on the ash behaviour in combustion of pelletized residual agricultural biomass

Royo

Canalís

Quintana

et al. 2019

Fuel

Self Cite

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“…Brassica) pellets resulted in CO emissions and efficiency requirements that were within the European requirements. However, the CO emissions and efficiency of Brassica pellets were worse than for poplar pellets, which was attributed to the higher ash content of the Brassica (10.7 %) compared to poplar [33]). Further work could be completed to investigate how the ash content of canola straw pellets could be reduced.…”

Section: Ash Contentmentioning

confidence: 95%

Physical quality changes during the storage of canola (Brassica napus L.) straw pellets

et al. 2012

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Brassica napus L. (canola/oilseed rape) straw presents a suitable alternative combustion fuel due to its availability, relatively high calorific value and low moisture content. Pelletization enabled the bulk density of canola straw to be improved, enhancing its potential as an alternative combustion fuel. The aim of the paper was to determine the effect of on-farm storage on the gross calorific value, ash content, volatile content and elemental composition of canola straw bales (stored for up to 20 months) and pellets (stored for up to 12 months). Statistically significant changes occurred to the elemental composition of straw bales and pellets during on-farm storage, but these changes were not of practical significance in terms of the materials suitability as a combustion fuel.

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“…2 The state-of-the-art method includes measuring combustion parameters in existing medium-scale devices, showing good results for CO emissions. The emissions remained below the limits set by the EN 303-5 norm 20 at all times, although limiting the fuel characteristics 13,21 or power. 14 Wood combustion requires a balance between the air and wood supply to minimize CO production.…”

Section: Introductionmentioning

confidence: 96%

Improving the Operation of an Automatic Wood Chip Boiler by Optimizing CO Emissions

et al. 2014

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In wood chip boilers, CO emissions can be reduced by improving the control over the combustion process. To minimize emissions and optimize efficiency, the excess air ratio, the primary and secondary air distribution systems, and the fuel feed rates must be adjusted to maintain stable combustion. An extensive series of wood combustion tests was performed in a grate automatic 180 kW th boiler. The level of influence exerted by wood parameters, such as the origin, particle size, and moisture content, and combustion parameters, such as the excess air ratio, air distribution, and boiler load, were studied. The most important characteristic of wood with regard to CO emissions is the moisture content. The combustion tests with both types of wood chips and sawdust show that the CO emissions and excess air ratio decline when the fuel power increases. The direct relationship between the excess air ratio and the level of power facilitates the optimization that minimizes the CO emissions. The control system must be based on a fluctuating O 2 concentration in the exhaust gas by varying the excess air ratio relative to the power demand. The excess air ratio needed to implement the optimal conditions should be between 2.0 and 2.5 at 100 kW th , between 1.9 and 2.1 at 135 kW th , and between 1.7 and 1.9 at nominal power.

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Combustion requirements for conversion of ash-rich novel energy crops in a 250 kWth multifuel grate fired system

Cited by 21 publications

References 24 publications

Experimental study on the ash behaviour in combustion of pelletized residual agricultural biomass

Experimental study on the ash behaviour in combustion of pelletized residual agricultural biomass

Physical quality changes during the storage of canola (Brassica napus L.) straw pellets

Improving the Operation of an Automatic Wood Chip Boiler by Optimizing CO Emissions

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