The results of study into the effect of air­steam blast on the low­grade fuel gasification process

Kukharets, S.; Цивенкова, Н. М.; Yarosh, Yaroslav; Грабар, Іван Григорович; Нolubenko, Anna

doi:10.15587/1729-4061.2018.147545

Cited by 7 publications

(11 citation statements)

References 24 publications

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“…The gasification chamber active zone temperature was 900-1000 ºС. Adding of superheated steam for high temperature gasification stabilizes the gasification process and leads to significant reduction of ash-slag agglomeration, which is very distinctive for burning fuels containing straw [14]. Nonetheless, using air with superheated steam as blowing gases speeds up the corrosion processes several times.…”

Section: Resultsmentioning

confidence: 99%

“…To do the experiments a special gasifier was developed, Fig. 1, with downdraft gasifier with productivity 60-68 m 3 •h -1 [14]. The experiments were made at atmospheric pressure.…”

Section: Methodsmentioning

confidence: 99%

“…Eight original experiments were made according to the planning matrix and polynomial linear part coefficients were calculated according to [15]. The values of the model's relative error for all experiments according the plan of multifactor analysis are lower than 3 % [14]. The values of mean relative deviation are lower than 1.87 % [15].…”

Section: Methodsmentioning

confidence: 99%

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Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

Holubenko

Цивенкова

Nezdvetskaya

et al. 2019

Engineering for Rural Development

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To gasify low quality biofuels it is proposed to use a downdraft gasifier with productivity by gas 60-68 m 3 •h-1. The research was made for fuel mixtures of chopped straw and hydrolyzed lignin with variable acidity. A multifactor experiment was made to estimate the influence of acidity and the moisture content of fuel mixture as well as temperature in an active zone of the gasification chamber on corrosion rate of an experimental specimen made of 15Cr21N5T. Similar experiments were made for specimens made of S32109, A57036 and Ni70Cr27Al. It was found that the moisture content influences corrosion more than acidity. Minimal corrosion rate was observed for fuel mixture with the moisture content 25 % and pH6. When raising temperature in the gasification chamber active zone from 600 to 1000 ºС, the corrosion rate rises by 8 % for the mixture with the moisture content 25 % and pH6 and by 17 % for the mixture with the moisture content 45 % and pH5. Within the interval 900-1000 ºС the highest quality producer gas was received having the calorific value of 9.6 MJ•Nm-3 with output of 2.7 m 3 •kg-1. It is confirmed that between 900-1000 ºС chloride and sulphide corrosion is significant for all types of materials. Raising the nickel content in alloy is lowering its corrosion resistance, which is confirmed with the specimen made of Ni70Cr27Al. Adding superheated steam to blowing gases is intensifying all corrosion processes. The received results of the corrosion processes could form a base of studying and computing other types of thermo-chemical conversion of low quality biofuels with similar chemical composition.

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Section: Resultsmentioning

confidence: 99%

“…To do the experiments a special gasifier was developed, Fig. 1, with downdraft gasifier with productivity 60-68 m 3 •h -1 [14]. The experiments were made at atmospheric pressure.…”

Section: Methodsmentioning

confidence: 99%

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Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

Holubenko

Цивенкова

Nezdvetskaya

et al. 2019

Engineering for Rural Development

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“…There are two ways of raising gasification process efficiency: design changes [3;9;10] and technological methods [11][12][13]. Particularly design changes could be: improvement of gasification chamber's design, grates' design, bunker's design, etc.…”

Section: Introductionmentioning

confidence: 99%

“…Technological methods -using different blowing modes (steam blowing, oxygen saturated air blowing, etc.) [11;13], which is, in turn, coordinated with gasifier's design and biomass fuel characteristics [12]. In works [4;14] methods of raising gasification process effectiveness by providing high temperature modes (up to 1500 ºC) in active zone [4] and raising reactive surface of the fuel [14].…”

Section: Introductionmentioning

confidence: 99%

The influence of the recovery chamber parameters on the efficiency of biomass gasification process

Цивенкова

Holubenko

Omarov

et al. 2019

Engineering for Rural Development

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The scientific work is devoted to investigation of dependence of length of way that blowing gas streams travels through active zone of gasification chamber, from its design and technological parameters. To find this a tuyere zone form and an analysis of blowing gas streams propagation kinetics through active zone was done. The gasifying chamber design is introduced. The chamber has a distinctive difference: moving tuyeres that can be moved along their axis. To control gasifying process a mathematical dependence was formed that connects average way of blowing gases in gasification chamber with geometrical parameters of this chamber, biomass fuel characteristics and air supply for gasifying. A multifactor experiment is done, where tuyere diameter, tuyere circle diameter and air supply for gasifying are variable factors. Response surfaces are built on that data. Experimental results let us define the optimal diapasons of each parameter that provides the highest gasifier's specific thermal productivity 11.1 MJ•m-3. The obtained measurement results are in high correlation with the calculations. The results let us that it is possible to manage the gasification process and receive high values of gasifier's specific thermal productivity while changing the tuyere circle diameter to match the fuel characteristics of biomass and air supply for gasifying. It is up to 20-23 % higher compared to gasifying biomass such as straw pallets in other known downdraft gasifyer designs.

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Identification of the low-rank coals thermal heating behavior

Mergalimova,

Atyaksheva,

Sultan

et al. 2024

EEJET

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In this study, the object of the research is low-rank coal during the process of thermal heating of five types: brown, high moisture brown, long-flame, coke weakly sintering and coke fusinite. In the research, when conducting thermal and gas analysis in inert media, the problem of using low-rank coal in the thermal heating process to obtain volatile fuel gases was solved by identifying the quantitative and qualitative performance of its behavior. Quantitative indicators are determined as the mass of thermal destruction products: the mass of coal tar and gas products and semi-coke under optimal temperature conditions of their maximum release. Qualitative indicators of coal behavior are components of thermal decomposition products. It is revealed that the behavior of low-rank coals in the process of thermal heating is determined by the degree of metamorphism. In this case, long-flame and brown coals have a lower release of volatile fuel gases than coke weakly sintering and coke fusinite coals due to a lower degree of metamorphism and greater degrees of thermal oxidation and dehydration. Thermal decomposition component ranges consisting of polyaromatic fragments (HCN, C6H12, C4H5N), greenhouse gases (CH4 and CO2), toxic gases (H2S and NH3) and synthesis gases (CO and H2) have the highest share of release. Optimal temperature conditions and ranges for the release of low molecular weight gases used as high calorific volatile fuel gases are obtained. The results can be used in the design, optimization and construction of thermal heating equipment, correction of gasification and pyrolysis processes. Moreover, they can be applied in localized coal tar spots minimization technologies and for designing targeted gases extraction

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The results of study into the effect of airsteam blast on the lowgrade fuel gasification process

Cited by 7 publications

References 24 publications

Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

The influence of the recovery chamber parameters on the efficiency of biomass gasification process

Identification of the low-rank coals thermal heating behavior

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The results of study into the effect of air­steam blast on the low­grade fuel gasification process

Cited by 7 publications

References 24 publications

Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

Results of investigation in corrosion processes in gasifyer gasifying fuels containing straw and lignin

The influence of the recovery chamber parameters on the efficiency of biomass gasification process

Identification of the low-rank coals thermal heating behavior

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The results of study into the effect of airsteam blast on the lowgrade fuel gasification process