Fundamental experiment on the combustion of coal-water mixture and modeling of the process

Takeno, Keiji; Tokuda, Kimishiro; Ichinose, Toshimitsu; Kaneko, Shozo

doi:10.1016/s0082-0784(96)80168-8

Cited by 6 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The research described above only takes moisture evaporation into account but not the influence of volatile release. Takeno et al 13 heated a single coal−water mixture droplet by laser and tested the pore structure changes during moisture evaporation and volatile release. The results showed that the samples first swelled and then shrunk, and the number of micropores increased before decreasing.…”

Section: Introductionmentioning

confidence: 99%

Surface Morphology and Porosity Evolution of CWS Spheres from a Bench-Scale Fluidized Bed

Wang

Guo

et al. 2015

Energy Fuels

View full text Add to dashboard Cite

Fluidization−suspension combustion technology is an effective method to utilize coal water slurry (CWS) as a fuel in industrial boilers. The evolution of surface morphology and pore structure of CWS spheres under fluidization−suspension combustion is studied. A bench-scale fluidized bed was used for combustion of CWS spheres with a bed temperature of 850°C, fluidization number of 4, and bed height of 90 mm. After 15, 30, and 45 s of combustion, the samples were removed from the bed for scanning electron microscope (SEM) and N 2 adsorption tests. The combustion mechanism of CWS spheres in the fluidization−suspension combustion state is discussed. The results show that after 15 s, the CWS spheres burst due to volatile release, and some particles fragmented to produce a large number of pores. Thus, the specific surface area and volume of pores increased rapidly. After 30 s, combustion occurred mainly at the exterior surface of CWS spheres and appeared as layer by layer inward combustion. This was confirmed by the fact that the specific surface area and volume did not change. After 45 s, as combustion proceeded, the flame front entered the interior surface through pores, and burnt the interior framework to make the pores collapse. Thus, the specific surface area and volume of pores decreased rapidly. In the whole combustion process, the fractal dimension first increased and then decreased, which demonstrates that the pore structure had experienced a process that went from complicated to simple.

show abstract

Section: Introductionmentioning

confidence: 99%

Surface Morphology and Porosity Evolution of CWS Spheres from a Bench-Scale Fluidized Bed

Wang

Guo

et al. 2015

Energy Fuels

View full text Add to dashboard Cite

show abstract

“…This means that the substance can be diluted with a large amount of transport gas, which is an advantage unattainable with heating methods such as thermogravimetry using electric heating devices [3].…”

Section: Test Methodsmentioning

confidence: 99%

“…However, because biomass is 70 to 90% decomposed by heating without oxygen, factors such as the amount of volatile matter are difficult to define, and new indices are required in place of standard technical analysis in order to describe combustion properties [3]. Also, during combustion of biomass particles, the insides of the particles undergo thermal decomposition in the absence of oxygen, and it is essential to understand the reactions among the substances released by this thermal decomposition so as to analyze both the combustion and gasification processes.…”

mentioning

confidence: 99%

Characteristics of the thermal decomposition of biomass and numerical simulation for the gasification of decomposed mixtures

Takeno

Ichinose

Fukuda

2006

Heat Trans. Asian Res.

Self Cite

View full text Add to dashboard Cite

As an initial step in clarifying the mechanisms of the combustion and gasification of biomass, fundamental experiments on the thermal decomposition and numerical simulation for the elementary reaction of decomposed chemical species have been performed. In the experiment, various kinds of biomass particles were rapidly heated by applying an electrically induced magnetic field to the metal tray on which the object particles had been placed. It was clarified that for the two decomposition temperatures of 590 and 1040 °C investigated, the relationship between decomposition rate and heating time was the same, but that the components of the decomposed species were substantially different; the mole fraction of C6-C9 components for the low temperature of 590 °C was 3 to 10 times greater than that corresponding to 1040 °C. Furthermore, a close relationship was ascertained between the percentage of heavy species (C10-C20) and the amount of lignin contained in the biomass. Numerical simulation indicated that these heavy species could decompose to C1 and H 2 at over 1000 °C with H 2 O acting as the oxidation agent, and that the effect of H 2 O under atmospheric pressure reaches a maximum at P H2O -0.7 atm.

show abstract

“…The significance of the WCF technologies development is highlighted by big amount of Chinese scientific papers devoted to investigations of WCF usage (for example, see [2][3][4][5][6][7][8][9]). Japan has switched from demo projects of 80-s to industrial usage of the WCF now, using significant basics of creation and usage of the water-coal fuels [10][11][12][13][14][15]. They mostly use steam-boilers with power 20-600MW.…”

Section: Introductionmentioning

confidence: 99%

“…However, taking in account the real needs in usage of WCF, some countries with deficit of natural resources support research and development activities for improvement of water-coal technologies [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. As result, the systematization of any data about ignition and combustion processes is still of interest.…”

Section: Introductionmentioning

confidence: 99%

The Review of Ignition and Combustion Processes for Water-Coal Fuels

Iegorov

Стрижак

Chernetskiy

2016

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. In this work we have reviewed the most of known investigations of the initialization of combustion processes of water-coal fuels. The main problems of such study were emphasized. The definitive effects and factors (like mixing ratio, milling quality, the temperature of the oxidant, properties of the components and methods of the slurry preparation etc.) which have strong influence on inertia and stability of the ignition were analyzed.

show abstract

Fundamental experiment on the combustion of coal-water mixture and modeling of the process

Cited by 6 publications

References 5 publications

Surface Morphology and Porosity Evolution of CWS Spheres from a Bench-Scale Fluidized Bed

Surface Morphology and Porosity Evolution of CWS Spheres from a Bench-Scale Fluidized Bed

Characteristics of the thermal decomposition of biomass and numerical simulation for the gasification of decomposed mixtures

The Review of Ignition and Combustion Processes for Water-Coal Fuels

Contact Info

Product

Resources

About