ignition of pulverized coal with arc heated air
Welcome to the broken dawn

ignition of pulverized coal with arc heated air

US4228747A - High energy arc ignition of pulverized

An electrical discharge is controlled in such a manner as to permit its use to reliably ignite a fuel stream consisting of pulverized coal entrained in air. The ignition technique of the present...

More

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 coal

More

Direct ignition of pulverized coal - Combustion ...

It is thought that the direct ignition of pulverized coal provided by present invention is successful because it provides appropriate conditions for propagation of flame within the flowing coal stream after the ignitor has caused ignition of some of the coal particles; above approximately a 1.0 air-to-coal weight ratio, propagation of the flame is difficult with unheated air, and direct ignition of pulverized coal by an arc ignitor

More

Plasma Technology for Enhancement of Pulverized Coal ...

2011-4-23  pulverized coal burner equipped with arc plasmatron. The base of the PFS is plasma thermochemical preparation of coal for burning. It consists in heating of coal/air mixture by plasma up to temperature of coal volatiles release and char carbon partial gasification. In PFS the coal/air

More

Ignition and combustion of laser-heated pulverized

1996-8-1  An increase in oxygen content gave a high heating rate in the ignition stage and raised the temperature in sustained combustion. Copyright (C) 1996 Elsevier Science Ltd. (Keywords: pulverized coal; combustion; laser heating) To minimize coke consumption and C02 emission, more and more pulverized coal is being injected into blast furnaces'.

More

Modeling of Coal Ignition in Plasma-Fuel Systems

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 with plasma torch.

More

Plasma Arc Burner for Pulverized Coal Combustion

2018-6-6  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

More

US4241673A - Direct ignition of pulverized coal -

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...

More

Comparison of pulverized coal combustion in air and

2009-5-1  Pulverized coal ignition and combustion determined by TG-DTA methodIgnition can be considered as the process initiating the combustion phenomenon and it is a key step due to its important influence on flame stability, pollutants emission and flame extinction.

More

Fundamental Experiments of Coal Ignition for Engineering ...

2018-9-25  pulverized coal particles were suspended in a laminar upward flow and rapidly heated by a single-pulsed YAG laser. Velocity of the upward flow was controlled according to the particle diameter. The heated pulverized coal particles were burned in the quartz test section (50mm cross section area). Emissions from the igniting and burning particles were

More

Modeling of Coal Ignition in Plasma-Fuel Systems

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 ...

More

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

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.

More

USE OF PLASMA ARC HEATER FOR HIGH COAL

- Reinforcement of the pulverized coal injection system to increase its capacity from 6 to 10 t/h; - Test and measurement equipment for operational control and information acquisition. The basic principle of the plasma torch is the conversion of electrical energy into heat by driving an electric arc through a mass of gaseous material.

More

Plasma Arc Burner for Pulverized Coal Combustion

2018-6-6  arc acts directly on pulverized coal-air mixture is simple. This should allow a significant improvement of pulverized coal combustion (especially low-quality coal) and its economic efficiency. Preliminary experiments demonstrated the successful functioning of the system. Keywords—Coal combustion, plasma arc, plasma torches, pulverized coal. I.

More

Laser Ignition of Pulverized Coals - Cal Poly

2019-5-31  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].

More

Fundamental Experiments of Coal Ignition for Engineering ...

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.

More

A study of combustion behavior of pulverized coal in

2002-1-1  In this study, high-temperature air is applied to a pulverized coal burner to investigate the effect of air temperature on ignition, coal burnout, and NOx emission. Pulverized coal is introduced into a cylindrical furnace of 1 m diameter and 3 m height using a waterooled stainless nozzle of

More

Coal Pulverization System: Explosion Prevention and ...

2018-10-2  Heated air enters the dryer from the left end and exits from the other end and brings the vapor extracted from the coal particles. A primary and a secondary bag filters are used to remove coal particles in air. In the cooling condenser, vapor is removed from air. Then cold air is heated by an electrical heater and enters the dryer again.

More

Boiler cold start using pulverized coal in ignitor

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 ...

More

CN2591434Y - High-temperature air ignitor for

The utility model relates to a high-temperature air ignitor for a pulverized coal fired boiler, which belongs to the technical field of an auxiliary machine of a boiler. An oil injection method is generally used by the pulverized coal fired boiler to carry out ignition to cause a large quantity of fuel oil to be consumed. In order to save the oil, the ignitor of the utility model which is ...

More

Arc Plasma Thermochemical Preparation of Coal to

The base of the PFS is plasma thermochemical preparation of coal for burning. It consists of heating of the pulverized coal and air mixture by arc plasma up to temperature of coal volatiles release and char carbon partial gasification. In the PFS coal-air mixture is deficient in oxygen and carbon is oxidised mainly to carbon monoxide.

More

USE OF PLASMA ARC HEATER FOR HIGH COAL

- Reinforcement of the pulverized coal injection system to increase its capacity from 6 to 10 t/h; - Test and measurement equipment for operational control and information acquisition. The basic principle of the plasma torch is the conversion of electrical energy into heat by driving an electric arc through a mass of gaseous material.

More

Laser Ignition of Pulverized Coals - Cal Poly

2019-5-31  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].

More

Fundamental Experiments of Coal Ignition for Engineering ...

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.

More

Ignition temperature of pulverized coal particles ...

1990-3-1  The ignition characteristics of a cloud of pulverized coal flowing in a drop-tube furnace are examined. Cloud ignition is defined at the minimum gas temperature at which significant oxygen consumption occurs. This is accompanied by the generation of carbon dioxide and oxides of nitrogen, and the formation of a visual flame.

More

Boiler cold start using pulverized coal in ignitor

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 ...

More

Mathematical Simulation of the Ignition of Coal Particles ...

ficient for the ignition of pulverized coal in an atmo sphere of air heated to relatively low temperatures. Published data [9–11] showed that, as a rule, the study

More

Coal Pulverization System: Explosion Prevention and ...

2018-10-2  Heated air enters the dryer from the left end and exits from the other end and brings the vapor extracted from the coal particles. A primary and a secondary bag filters are used to remove coal particles in air. In the cooling condenser, vapor is removed from air. Then cold air is heated by an electrical heater and enters the dryer again.

More

Boiler cold start using pulverized coal in ignitor

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 ...

More

CN2591434Y - High-temperature air ignitor for

The utility model relates to a high-temperature air ignitor for a pulverized coal fired boiler, which belongs to the technical field of an auxiliary machine of a boiler. An oil injection method is generally used by the pulverized coal fired boiler to carry out ignition to cause a large quantity of fuel oil to be consumed. In order to save the oil, the ignitor of the utility model which is ...

More
Copyright © 2021.Company name All rights reserved.Dawn Broken