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ignition of pulverized coal with arc heated air

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The concept of equipment thermal power plant boilers ...

The concept of equipment thermal power plant boilers installations microwave ignition pulverized coal mixture Abstract: Gist of plasma ignition of the coal-air mixture is pre-gasification of coal, which allows its ignition at boilers of Heat power station without additional high-energy fuels, namely, natural gas or fuel oil. Plasma energy ...

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Numerical Simulation of High-Temperature Air Direct ...

Numerical simulation method is employed in this article to investigate various high-temperature air direct-ignition processes of pulverized coal (PC). Several important factors are analyzed, which are the inlet velocity of primary air flow, PC concentration and the velocity and temperature of high temperature air.

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Mathematical simulation of ignition of a coal-dust ...

Abstract. The process of aerosuspension ignition of a suspension in air in a pulverized-coal burner with a preswitched muffle by a central axisymmetric air stream heated in an electric-arc plasmatron to a temperature of about ≈5000K is numerically simulated. This process is the basis of a new fuel-oil-free method of ignition of the boilers of thermal power stations.

1.1 Bituminous And Subbituminous Coal Combustion

The most common heat transfer method for coal-fired boilers is the watertube method in which the hot combustion gases contact the outside of the heat transfer tubes, while the boiler water and steam are contained within the tubes. Coal-fired watertube boilers include pulverized coal, cyclone, stoker, fluidized bed, and handfed units.

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Mathematical simulation of ignition of a coal-dust ...

Abstract The process of aerosuspension ignition of a suspension in air in a pulverized-coal burner with a preswitched muffle by a central axisymmetric air stream heated in an electric-arc plasmatron to a temperature of about ≈5000 K is numerically simulated.

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SPONTANEOUS COMBUSTION IN COAL - COALspot

SPONTANEOUS COMBUSTION IN COAL ... and ultimately self-ignition and flame, will occur. The risk from fire exists anywhere significant amounts of coal are in use or storage. Coal is a combustible ... coal absorbs oxygen from the air. Heat generated by the oxidation then initiated the fire.

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Progress in Energy and Combustion Science

the context of heat and mass transfer, fuel delivery and injection, coal particle heating and moisture evap-oration, devolatilization and ignition, char oxidation and gasification, as well as pollutants formation. Operation under elevated pressures has also been proposed for oxy-coal combustion systems in .

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Pulverized coal burner - russianpatents

In Fig.1 shows a longitudinal section of a pulverized coal burner with built-in pre-heated dust, Fig.2 auxiliary burner; Fig. 3 is a longitudinal section of the Central tube; Fig.4 the position of the Central pipe in the burner housing. ... The main stream of air entering the pulverized coal burner for nozzle 2, ... ignition device and hot air ...

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Burners and overfire air (OFA) - babcock

B&W engineers designed the AireJet burner with an innovative burner structure — a burner built around a center jet of air, encircled by the fuel stream, and then wrapped in additional combustion air. Pulverized coal-fired boiler applications; Much cleaner burning so it requires less excess air to minimize carbon monoxide (CO) and unburned carbon

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Fundamental Experiments of Coal Ignition for Engineering ...

Coal +air Secondary air Coal +air Secondary air Recirculation flow (2) Coals are heated by high temperature gas in the recirculation flow (3) Coals are also heated by radiant heat from surroundings (1)Coal +air mixture at ignition point is flammable Fig. 2. Examples of detailed calculated results of pulverized coal combustion.

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High energy arc ignition of pulverized coal - Combustion ...

Oct 21, 1980 · The present invention overcomes the above-discussed dificiencies and disadvantages of the prior art by providing for the "direct" ignition of a stream of pulverized coal and air in a "cold" environment through the use of only a high energy electrical arc as an ignition energy source.

  • Authors: Martin Edward Smirlock · Donald Arthur SmithAbout: Electric current · Ignition system · Chemical reaction · Coal · Fossil fuel · CombustionGet Price

Plasma-assisted ignition and combustion of pulverized coal ...

pulverized coal (coal/air mixture) was 90 О С, coal and primary air consumptions through PFS were 3200 and 6400 kg/h correspondingly. The results of numerical simulation by the PLASMA-COAL code are summarized in Table . Heat value of the coke I residue was 8580kJ/kg. These data were taken as .

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Coal utilization - Coal combustion | Britannica

Pulverized coal. Pulverized-coal combustion is widely used in large power stations because it offers flexible control. In this method, coal is finely ground so that 70 to 80 percent by weight passes through a 200-mesh screen. The powder is burned in a combustion chamber by entraining the particles in combustion air.

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1.1 Bituminous And Subbituminous Coal Combustion

The most common heat transfer method for coal-fired boilers is the watertube method in which the hot combustion gases contact the outside of the heat transfer tubes, while the boiler water and steam are contained within the tubes. Coal-fired watertube boilers include pulverized coal, cyclone, stoker, fluidized bed, and handfed units.

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Operating experience with direct ignition of pulverized ...

Several systems have been developed recently for igniting pulverised fuel boilers without the need for supplementary fuel. Combustion Engineering have introduced a system called Direct Igntion of Pulverized Coal (DIPC) which uses high-intensity arc ignition of very finely ground coal. This is being tested at the TVA power station.

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BURNING IN BOILER FURNACES - Politechnika Wrocławska

Phases of pulverized coal burning The time of pulverized coal-air mixture in a furnace can be divided into three periods: 1. drying, devolatilization and ignition of coal particles, which requires 0.2–0.3 s, 2. Intensive mixing and burning of pulverized coal-air jet during 0.5–1.5 s on a distance of 1–5 m with formation of flame kernel

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Coal burner - Wikipedia

The coal pulverizer will crush the coal into pulverized coal. In the coal burner, the pulverized coal mixes with air (High-speed air flow is generated by the draft fan on the coal burner), and is ignited by the oil burning igniter. Ignition. There are mainly two ways to ignite the coal burner.

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Laser Ignition of Pulverized Coals - Cal Poly

to examine pulvcrized-coal ignition. Most arc described in the review by Essenhigh et al. (21­ The ignition behavior of clouds of pulverized fuel is of greatest interest to those concerned with the prevention of dust explosions (in coal mines or grain elevators, for example) and with flame stabiliry in coal-fired combustors (3-5].

  • Published in: Combustion and Flame · 1994Authors: John C Chen · Masayuki Taniguchi · Kiyoshi Narato · Kazuyuki ItoAffiliation: Hitacout: Amorphous carbon · Coal · Chemical reaction · Combustion · Wind tunnel · KineticsGet Price

A numerical study of pulverized coal ignition by means of ...

International Journal of Heat and Mass Transfer. Volume 51, Issues 7–8, April 2008, Pages 1970-1978. A numerical study of pulverized coal ignition by means of plasma torches in air–coal dust mixture ducts of utility boiler furnaces ... Paper presents selected results of numerical simulation of processes in air–coal dust mixture duct of ...

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Induction-heating ignition of pulverized coal stream ...

Induction-heating ignition burner for the pulverized coal fired boiler is introduced. Some experiments were conducted on an experimental set-up, which includes alternative current power system, induction-heating system, pulverized coal and air supplier system, and measurement system to study the ignition process of coal powder and air mixture stream.

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US4241673A - Direct ignition of pulverized coal - Google ...

Pulverized coal is ignited, to furnish energy for warm-up or low load operation of a coal burning furnace, by a technique which does not require the combustion of significant quantities of liquid or gaseous fuels. The direct ignition of pulverized coal in accordance with the present invention contemplates the delivery of a dense phase coal/air stream to an ignition zone where it receives ...