A pre-heating vaporization technology of coal-water-slurry for the gasification process

Aiuchi, Kosuke; Moriyama, Ryo; Takeda, Shohei; Kitada, Shunji; Onozaki, Masaki; Katayama, Yoshinori

doi:10.1016/j.fuproc.2004.10.010

Cited by 31 publications

(11 citation statements)

References 8 publications

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“…Such a fuel is called an organic coal-water (OCWF) or composite liquid fuel (CLF). At present, a high level of solving the technical problems in preparing CWS compositions, whose characteristics allow their application at power facilities, has been achieved [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of aerodynamics of a pneumatic nozzle for suspension fuel

Алексеенко

Ануфриев

Дектерев

et al. 2019

International Journal of Heat and Fluid Flow

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One of the topical problems of coal power engineering both from the point of increasing efficiency and ecological safety of heat energy production and need to utilize low-grade coals and coal wastes is the development of combustion technology for coal in the form of a coal-water suspension (CWS). The technologies of CWS combustion place high demands to the spraying devices (nozzles): absence of narrow fuel channels, which can be locked; low fuel velocities relative to the solid walls, which will reduce abrasive wear. The authors of the paper propose a pneumatic nozzle based on the use of the properties of near-wall and cumulative jets of liquid and gas and Coanda effect, which meets the basic requirements for CWS injectors. Aerodynamics control plays the determining role in the efficiency of pneumatic nozzle operation. In this paper, the structure of a single-phase gas flow in the proposed pneumatic nozzle is studied under different regime parameters using the experimental and numerical methods. The studies were carried out using the particle image velocimetry (PIV) and mathematical modeling of the flows by means of the DES and RSM turbulence models. It is shown that in the entire investigated range of excess air pressure, the converging annular jet turns into the concentrated one and forms the direct and return cumulative axial jets in the nozzle near the axis of symmetry. Due to interaction of the return and annular jets in the diffuser, a toroidal vortex is formed. At operation of a liquid fuel nozzle, such a return flow will contribute to the effective destruction of a liquid jet and formation of a highly dispersed two-phase flow. With an excess air pressure in the nozzle of 1 bar, a sound annular converging jet is formed at the nozzle outlet; with a further increase in pressure, the outflowing jet becomes supersonic, the oblique shock waves are formed there, and the axial jet acquires a barrel-like shape with formation of the Mach disks. Such a complex spatial arrangement of the flow (both in the toroidal vortex and outside it) ensures efficient dispersion of liquid fuel in this nozzle.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of aerodynamics of a pneumatic nozzle for suspension fuel

Алексеенко

Ануфриев

Дектерев

et al. 2019

International Journal of Heat and Fluid Flow

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“…Preparation of coal-water slurry (CWS) significantly expands the various possibilities of coal types and allows providing a fire-and explosion-free safety and reducing loss due to dusting. Besides, according to previous data (Aiuchi et al 2007) the syngas produced during gasification of CWS has high hydrogen content. For determination of the syngas composition at the designing stage of the process, schemes using complex coal and other solid fuels need to take into account an initial component structure and decomposition mechanism at defined conditions.…”

Section: Introductionmentioning

confidence: 61%

“…One of the most important techniques for increasing gasification efficiency is the preheating vaporization technology. Aiuchi (2007) showed that the application of this technology promotes increasing the process efficiency and prevents coalescence of coal particles. Reported data showed that the most of the processes are based on technologies that involve complex processing of solid fuels besides huge costs for production of valuable chemicals and generation of thermal and electrical energies.…”

Section: Introductionmentioning

confidence: 99%

Physico-chemical foundations of produced syngas during gasification process of various hydrocarbon fuels

Mingaleeva

Ermolaev

Галькеева

2015

Clean Techn Environ Policy

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The gasification processes of coal, coal-water slurry, and natural bitumen were studied. A new method involving application of hydrocarbon fuels was proposed. It allows one to create process schemes which can be adopted for changing feedstock's properties in a wide range by the variation of gasification parameters. The integrated gasification unit allows using the local resources and not being dependent on external fuel deliveries. However, for designing such projects, it is necessary to study the physicochemical processes involved in the thermochemical processing of various fuel types. For calculation of gas composition, three fuel types were selected: Kamsky long-flame coal, coal-water slurry based at Kama coal dust, and natural bitumen from Ashalchy oil field. During thermochemical processing of various feedstock types, by varying gasification parameters, syngas with the required application ratio of CO/H 2 was obtained. These fuels have various compositions, but they are located at one region. The syngas thus produced may be used in the chemical and energy industries.

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“…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

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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.

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A pre-heating vaporization technology of coal-water-slurry for the gasification process

Cited by 31 publications

References 8 publications

Experimental and numerical investigation of aerodynamics of a pneumatic nozzle for suspension fuel

Experimental and numerical investigation of aerodynamics of a pneumatic nozzle for suspension fuel

Physico-chemical foundations of produced syngas during gasification process of various hydrocarbon fuels

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

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