ignition of pulverized coal with arc heated air

US4228747A - High energy arc ignition of pulverized coal ...

The present invention relates to the "direct" ignition of pulverized coal and particularly to the employment of an electric arc to initiate the combustion of a fuel stream comprised of pulverized...

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

Ignition of a cloud of pulverized coal is not a simultaneous event. A typical pulverized coal particle (-200+300 mesh) will burn out within one second. Thus, if a flame is to be propagated, the particles ignited by an ignition energy source must transfer energy to and ignite some of their neighboring particles.

Induction-heating ignition of pulverized coal stream ...

2004-11-1 · 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.

The effectiveness of a novel coal-igniting-fuel technology ...

The numerical results show that coal particles inside the ignitor are rapidly heated and ignited, after which the resulting flame is gathered and accelerated by the flame extension tube, thereby...

Ignition and combustion of laser-heated pulverized coal ...

1996-8-1 · Ignition and combustion of laser-heated pulverized coal. M. Qu et al. 1000 800 f- _ 600 r, a 2 d 400 0 0 20 40 1.5 2 2.5 0 0.2 0.4 0 50 100 Volatile matter (wt.%) Laser input (W/mm2) Particle diameter (mm) Oxygen content (vol.%) Figure 7 Effects of volatile matter, laser input, particle diameter and oxygen content on time required to reach 973 ...

Modeling of Coal Ignition in Plasma-Fuel Systems With an ...

2019-12-20 · Modeling of Coal Ignition in Plasma-Fuel Systems With an Electric Arc Torch Abstract: Results of numerical experiments on ignition of pulverized coal in a plasma-fuel system (PFS) are presented. PFS is designed for fuel oil-free startup of the boilers and stabilization of pulverized coal flame and represents a pulverized coal burner equipped ...

Plasma Technology for Enhancement of Pulverized Coal ...

2011-4-23 · PFS improve coal ignition and burnout without the need for such remedies as increasing the mill temperature, augmenting the excess air factor, or finer grinding. Power consumption for PFS does not exceed 2% from heat capacity of the reequipped pf

Direct ignition of pulverized coal - Combustion ...

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 ignition energy and the thus ignited mixture is thereafter contained in a recirculation region until the flame becomes self-sustaining.

Laser ignition and flame propagation of pulverized coal ...

1996-1-1 · Ignition and combustion behaviors were examined for uniformly sized, pulverized coal dust clouds that were suspended in a laminar upward flow and heated by a single-pulsed YAG laser. Effects of coal type, particle diameter, and oxygen concentration on lean limit of flame propagation and flame propagation velocity for hv and lv bituminous coals ...

Ignition of large size coal in a gas-phase temperature ...

2021-3-1 · Experimental results of coal ignition were always experiment- or device-specific for a wide variety of experimental conditions with different definitions of the ignition events being used in different techniques [].As illuminated in Fig. 1 (a), when only the coal particle was heated and the chamber was kept at room temperature, both homogeneous (gas-phase) and heterogeneous (solid-phase ...

The effectiveness of a novel coal-igniting-fuel technology ...

PFS is a pulverized coal burner equipped with arc plasmatron producing high temperature air stream of 4000–6000 °C. Basis of technology PFS is plasma thermo-chemical preparation of coal for ...

Modeling of Coal Ignition in Plasma-Fuel Systems With an ...

2019-12-20 · Modeling of Coal Ignition in Plasma-Fuel Systems With an Electric Arc Torch Abstract: Results of numerical experiments on ignition of pulverized coal in a plasma-fuel system (PFS) are presented. PFS is designed for fuel oil-free startup of the boilers and stabilization of pulverized coal flame and represents a pulverized coal burner equipped ...

PLASMATRON IGNITION OF PULVERIZED COAL FOR

in this project, the use of a plasmatron to ignite pulverized coal (pc) for utility boilers is being explored. air is passed through the arc of the plasmatron, creating a high temperature plasma (8,500 k) with highly reactive oxygen radicals that easily combine with and ignite pulverized coal.

Plasma Arc Burner for Pulverized Coal Combustion

In our proposed system, pulverized coal-air mixture passes through plasma arc area that burns between to carbon electrodes directly in pulverized coal muffler burner. Consumption of the carbon electrodes is low and does not need a cooling system, but the main advantage of this method is that radiation of plasma arc directly impacts on coal-air ...

Ignition and Combustion of Pulverized Coal and Biomass ...

This work studied the ignition and combustion of burning pulverized coals and biomasses particles under either conventional combustion in air or oxy-fuel combustion conditions. Oxy-fuel combustion is a 'clean-coal' process that takes place in O2/CO2 environments, which are achieved by removing nitrogen from the intake gases and recirculating large amounts of flue gases to the boiler.

LABORATORY AND INDUSTRIAL STUDIES OF GAS COAL

2020-12-4 · One of the modern technologies is the use of a direct current plasmatron for ignition and stabilization of the pulverized coal flame [9]. This technology is based on heating the flow of a pulverized-coal mixture by a high temperature plasma arc at oxygen deficiency to the tem-perature exceeding the self-ignition temperature of this coal [10].

What is the working principle of the pulverized coal ...

2021-4-9 · The basic principle of plasma ignition technology is to directly ignite pulverized coal with a high-power arc. The ignition device uses direct current (greater than 200 A) to initiate arc through yin and yang contact under the condition of medium pressure greater than 0.01 MPa, and obtains a stable power direct current air plasma under a strong magnetic field.

Microwave plasma combustion of coal | Request PDF

PFS is a pulverized coal burner equipped with arc plasmatron producing high temperature air stream of 4000–6000 °C. ... air ignition technology [3][4], laser-heated ignition technology [5] and ...

Boiler cold start using pulverized coal in ignitor burners ...

Abstract. An ignition, warm-up and low-load-stabiliztion system for furnaces fired by pulverized coal is described. In conjunction with a system in which pulverized coal is sent directly from a coal mill to a load-bearing nozzle and in which combustion air is brought to the nozzles from an air preheater that uses hot furnace gases to warm the combustion air, ignitor nozzles are provided that ...

Pulverized Coal Stream Ignition and Combustion ...

Pulverized Coal Stream Ignition and Combustion Characteristics Based on Multiple Optical Diagnostic Techniques February 2018 Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of ...

Fundamental Experiments of Coal Ignition for

2018-9-25 · 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.

Plasma Arc Burner for Pulverized Coal Combustion

In our proposed system, pulverized coal-air mixture passes through plasma arc area that burns between to carbon electrodes directly in pulverized coal muffler burner. Consumption of the carbon electrodes is low and does not need a cooling system, but the main advantage of this method is that radiation of plasma arc directly impacts on coal-air ...

Plasma Torch for Plasma Ignition and Combustion of Coal ...

Plasma-fuel systems (PFS) have been developed to improve coal combustion efficiency. PFS is a pulverized coal burner equipped with arc plasma torch producing high temperature air stream of 4000 - 6000 K. Plasma activation of coal at the PFS increases the coal reactivity and provides more effective ignition and ecologically friendly incineration of low-rank coal.

Ignition and combustion of pulverized coal and biomass ...

This work studied the ignition and combustion of burning pulverized coals and biomasses particles under either conventional combustion in air or oxy-fuel combustion conditions. Oxy-fuel combustion is a 'clean-coal' process that takes place in O2/CO2 environments, which are achieved by removing nitrogen from the intake gases and recirculating large amounts of flue gases to the boiler.

Boiler cold start using pulverized coal in ignitor burners ...

Abstract. An ignition, warm-up and low-load-stabiliztion system for furnaces fired by pulverized coal is described. In conjunction with a system in which pulverized coal is sent directly from a coal mill to a load-bearing nozzle and in which combustion air is brought to the nozzles from an air preheater that uses hot furnace gases to warm the combustion air, ignitor nozzles are provided that ...

Mechanistic Investigations of Particle Ignition of ...

2020-11-26 · The ignition behavior of coal particles was studied through an enhanced numerical model, combined with experimental investigations in a visual drop tube furnace in the temperature range of 1100–1300 K. The devolatilization and the combustion of volatile and char during combustion of single coal particle were thoroughly studied. The devolatilization model was established with the results ...

Boiler cold start using pulverized coal in ignitor burners ...

An ignition, warm-up and low-load-stabilization system for furnaces fired by pulverized coal. In conjunction with a system in which pulverized coal is sent directly from a coal mill to a load-bearing nozzle and in which combustion air is brought to the nozzles from an air preheater that uses hot furnace gases to warm the combustion air, ignitor nozzles are provided that are supplied by pipes ...

Ignition of Coals by Laser Pulses in the Free-Running

2021-6-28 · The minimum ignition energy in air of the Sebuku coal was equal to 55 mJ, while the minimum ignition energy of the Pittsburgh coal was higher than 1000 mJ. The ignition

Effect of pyrolysis characteristics on ignition mechanism ...

2014-5-6 · Most of the previous work on coal ignition mechanisms and ignition delays was conducted in air or other O 2 /N 2 atmospheres. Only a few scholars have studied the ignition mechanism of pulverized coal in O 2 /CO 2 atmosphere, and some distinct or even opposite results were drawn by different authors. In general, the ignition mechanism of ...

邹春 教授-郑楚光科研团队

2021-1-15 · 华中科技大学煤燃烧国家重点实验室教授,博士生导师。长期从事燃烧基础研究、湍流燃烧数值模拟以及小型燃烧装置研发等方面的研究。目前的主要研究方向是oxy-fuel燃烧、oxy-steam燃烧、MILD燃烧、对冲燃烧、燃烧模型以及小型燃烧装置。

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