RU2341728C1 - Firing system - Google Patents

Abstract

FIELD: heat-power engineering.

SUBSTANCE: firing system consists of a combustion chamber with vertical walls, hot air duct connected with combustion chamber by means of burners, bottom-blowing air duct connected with air nozzles which are installed opposite in a staggered order near the dry bottom hopper hole along extended slopes. Aim of invention is achieved by the fact that some air nozzles are located near dry bottom hopper hole on vertical walls throughout the height of combustion chamber.

EFFECT: invention allows improving the afterburning efficiency of unburnt fuel particles falling down to dry bottom hopper, decreasing nitrogen oxide emission level, and reducing slagging of dry bottom hopper slopes, which leads to improvement of reliability and economy.

2 dwg

Description

The invention relates to the field of power engineering and can be used in other industries.

A furnace device is known, at the mouth of a cold funnel of which lower blast nozzles are installed along extended slopes (SU 861847, IPC F23C 7/02, published September 7, 1981).

A disadvantage of the known device is the increased losses with a mechanical burnout, due to the failure of part of unburned fuel particles from the vortex zone in the lower part of the cold funnel. The failure of unburned fuel particles is associated with the fact that in this furnace device there is a large distance from the burners to the nozzles of the lower blast, which leads to the separation of the lower vortex combustion zone from the main flame, while the amount of heat from the main flame entering the lower vortex sharply decreases zone. This leads to the accumulation of fuel in the lower part of the cold funnel, to the loss of part of unburned fuel in the slag chest and increases losses with a mechanical underburning.

It is known a furnace device for steam generators with burners mounted on the walls of the furnace and containing a funnel with inclined ramps with the lower blast nozzles placed along the last nozzles (RU 2143639, IPC F23C 7/02, published December 27, 1999).

A disadvantage of the known device is the presence of slightly blown sections of the inclined slopes of the funnel located between the extreme nozzles and the vertical walls of the combustion chamber at the mouth of the cold funnel, which leads to the failure of particles of unburned fuel, and in the case of the boiler working on slagging coal, to slag these sections and, as a result to loss of performance.

The closest technical solution to the claimed device is a combustion device comprising a vertical combustion chamber, a hot air duct connected through burners to a combustion chamber, and a lower blast duct — with air nozzles mounted in a checkerboard pattern at the mouth of a cold funnel along long slopes (RU 2094699, IPC F23C 7/02, published October 27, 1997).

This known device is the closest to the proposed combination of features and is taken as a prototype.

The disadvantage of this furnace device, as industrial tests have shown, is the slagging of weakly blown sections of the slopes of the cold funnel and additional losses with mechanical unburning due to the failure of part of unburned fuel particles in these sections located between the extreme nozzles and the vertical walls of the combustion chamber, which reduces the efficiency of the work boiler and limiting its performance.

The claimed solution allows to increase the efficiency of afterburning of unburned fuel particles falling into the cold funnel, that is, to drastically reduce losses with mechanical unburning from the failure of unburned fuel particles, as well as to reduce the level of nitrogen oxide emissions and reduce slagging of the slopes of the cold funnel, which increases the reliability and efficiency of the furnace devices.

A furnace device is proposed that includes a combustion chamber with vertical walls, a hot air duct connected through burners to a combustion chamber, and a lower blast duct — with air nozzles mounted staggered at the mouth of a cold funnel along long slopes, with some of the air nozzles located at the mouth of a cold funnel on vertical walls along the entire height of the combustion chamber device.

The invention is illustrated in figures 1 and 2, which shows the proposed furnace device.

The combustion device includes a combustion chamber 1 with two vertical walls 2, passing in the lower part into inclined slopes of the cold funnel 3, and two vertical walls 4 along the entire height of the device, a hot air duct 5 connected via burners 6 to the combustion chamber 1, and a bottom duct blast 7 - with air nozzles 8 installed counter-staggered on one or two slopes of the cold funnel 3, and part of the air nozzles 9 is located at the mouth of the cold funnel 3 on vertical walls 4 over the entire height e combustor device 1.

The furnace device operates as follows.

Pulverized fuel and part of the hot air enter the combustion chamber 1 through burners 6 through air ducts 5. Large fractions of the fuel are separated onto the slopes of the cold funnel 3, which are blown by air coming from nozzles 8 and 9, connected by means of air ducts of the lower blast 7 to air ducts of hot air 5 At the same time, the air leaving the nozzles 9 effectively blows the surface of the inclined slopes of the cold funnel 3 located near the vertical walls 4, thereby eliminating the slagging of this surface and the failure esgorevshih fuel particles on her chest slag.

Claims (1)

A combustion device, including a combustion chamber with two vertical walls passing at the bottom into inclined slopes of a cold funnel, and two vertical walls along the entire height of the device, a hot air duct connected by means of burners to the combustion chamber, and a lower blast duct with air nozzles, installed counter-staggered on one or two slopes of a cold funnel at the mouth of a cold funnel along long slopes, with some of the air nozzles located at the mouth of a cold raven ki on vertical walls over the entire height of the combustion chamber device.

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