SU1222981A1 - Swirling-type furnace - Google Patents

Description

The invention relates to a device for burning fuel and can be used in thermal power plants.

The purpose of the invention is to increase the economy by reducing losses from underburning of fuel and ensuring sustainable ignition.

FIG. 1 shows a vortex topk, longitudinal section; Figures 2-6 are an embrasure view, variants 1-5, respectively.

The vortex furnace contains a chamber 2 cooled by pinching and a multi-faceted. Horizontal combustion chamber 3, in the upper part of

the front wall 4 of which has vertical slotted embrasures 5, each of which has a lower channel 6 of an air mixture and an upper channel 7 of secondary air, are made with a predetermined pitch. Channel 6 of the slurry in the embrasure 5 is filled with expanding upward.

The vortex furnace works in the following way.

Fuel, such as coal dust and secondary air, is fed into the volume of the combustion chamber 3, respectively, through channels 6 and 7. The fuel-air jets flowing out of the embrasures 5 develop first by themselves and then merge into a common flow. . In the section of the separate motion of the jets, the fuel ignites when moving. In general, its whirling flame burns. At the same time, fine dust particles are burned in a suspended state in the flow, and large particles - on a slag film when they are blown up with an oxidizing gas medium. Gaseous products of combustion, as well as a small portion of fly ash and unburned fuel, are carried to the cooling chamber 2.

Due to the fact that Channel 6 of the aero mix is made up of an upward flow of combustion products, moving along the front wall 4 of the combustion chamber 3 easily flows past the expiring

from embrasure 5 jet. Weakened

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The dynamic effect of the underflow on the jets makes it possible to obtain a cross-sectional shape of the jets, which is close to symmetrical about the horizontal axis of this section. This contributes to the fact that the dust introduced into the combustion chamber 3, which moves in the lower part of the jets, is entrained by air flow and recirculating flue gases into the vortex motion in the combustion chamber 3 and only a small part of the fresh air is captured by the flow of combustion products and transferred into the combustion chamber 2 cooling. As a result, efficiency is increased by reducing losses from underburning of fuel.

In addition, the proposed furnace provides for improved stability of the ignition of the mixture, since, with a narrowed lower part of the embrasures 5, the heating of the air flow accelerates and the heat dissipation from the reaction zone is reduced. The latter is due to the fact that the highest values of the vi-2 velocity of the demolishing flow of combustion products occur above the level of fuel input.

The shape of the upper part of the embrasure 5 influences the conditions of the interaction of the scavenging flow of combustion products with the air flows of the jets and has almost no effect on the conditions of the interaction of the flow of combustion products with the fuel flows and the nature of the deformation of the lower half of the jets. Thus, the upper part of the embrasure 5 can also be made with a narrowing in the direction of top, bottom. At the same time, a part of the secondary air is carried away to the cooling chamber 2 as a result of enhanced capture of it by the drift gas flow, which in some cases can be useful in organizing afterburning in the cooling chamber 2. Making the upper part of the embrasure 5 according to the forms shown in FIG. 5-6, reduces the hydraulic resistance of the jet system by improving flow

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Compiled by V.Kruglnsky. Editor I. Derbak Tehred M.Morgental Corrector M. Maximipmnets

Order 1694/39 Circulation 514 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Fik.v

Claims (1)

Vortex furnace containing a clamped cooling chamber and a multifaceted horizontal combustion chamber, in the upper part of the front wall of which vertical slit-shaped embrasures are made, each of which has a lower air mixture and an upper secondary air channel, characterized in that, in order to increase efficiency by reducing incomplete burning of fuel and ensuring stable ignition of the mixture, the channel of the air mixture in the embrasure is made expanding upward. ND ND ND About © QO ft. 1> <1222981 1