Combustion of black coal in the form of coal-water slurry in low-capacity boilers

Maltsev, L. I.; Кравченко, И. Н.; Лазарев, С. И.; Lapin, D. A.

doi:10.1134/s0040601514070064

Cited by 18 publications

(6 citation statements)

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“…At the same time, they burn badly and boilers working on these coals have low efficiency. The technology of coal combustion in the form of coal-water suspension (CWS-technology) allows coal waste utilization, increasing the burning efficiency of low-grade coals [1][2][3]. Along with this, alternative suspension fuels, consisting of water, crushed coal (or combustible waste of its processing), chemical additives, and refinery waste are actively used now to produce energy [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…Some principal questions of nozzle operation are considered in [12]. Although this nozzle is used at industrial power facilities [1], until now there were no systematic studies of hydro-gas-dynamic processes ensuring nozzle operation, required for optimization of operating conditions. In this paper, as a first step, the structure of the gas flow, leaving the pneumatic nozzle of the proposed design, is studied experimentally and theoretically under various regime parameters without liquid (suspension) supply.…”

Section: Introductionmentioning

confidence: 99%

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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%

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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“…Authors of paper [16] identified a problem of the inappropriate use of coal through burning it in the form of a water-coal suspension, which is carried out in the boiler units of small capacity. The study, however, did not compare a given technique for using coal with alternative methods.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Obtaining synthesis-gas by the stone coal steam conversion using technology of aerosol nanocatalysis

Luhovskoi

Glikin

Kudryavtsev

et al. 2017

EEJET

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“…One of the promising types of fuel for power engineering is coal-water slurries (CWS) [10][11][12]. The amount of pollutants emissions decreases after their combustion [13][14][15][16][17]. But at the same time, the calorific value of such fuel also decreases in comparison with coal.…”

Section: Introductionmentioning

confidence: 99%

Spraying Characteristics of Alcohol‐Coal‐Water Slurries with Low Coal Content

et al. 2022

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The results of spraying characteristics of alcohol‐coal‐water slurries are presented. It has been experimentally proved that the lowest viscosity value of the studied slurries varies from 54 to 329 mPa s. The density value of alcohol‐coal‐water slurries decreases to 1130 kg m−3 when the content of isopropyl alcohol in the fuel composition is 8 wt %. The largest value of jet spraying angle corresponds to alcohol‐coal‐water fuel with an isopropyl alcohol content of 8 wt %. The number of sufficiently large droplets decreases in comparison with a typical two‐component coal‐water fuel. The calorific value of alcohol‐coal‐water slurries rises when the third liquid fuel component is introduced into the composition of coal‐water fuel.

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Combustion of black coal in the form of coal-water slurry in low-capacity boilers

Cited by 18 publications

References 0 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

Obtaining synthesis-gas by the stone coal steam conversion using technology of aerosol nanocatalysis

Spraying Characteristics of Alcohol‐Coal‐Water Slurries with Low Coal Content

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