SU1167404A1 - Cyclone furnace for burning sulfate leach - Google Patents

Abstract

1. CYCLONE HEAT FOR BURNING SULFATE LIQUID, containing a lined combustion chamber with a burner, liquor supply pipes, auxiliary fuel and air, and a bath collecting liquid melt with reducing agent supply and elimination pipes connected to the combustion chamber of a lined air mixing chamber with incomplete products Combustion and tangentially installed air nozzles for supplying air to both chambers, characterized in that, in order to increase the sulfidity of the melt by intensifying the effect, restore l for the entire volume of the melt at provision. In the explosion-proof design, the mixing chamber is inclined towards the combustion chamber, allowing the liquid melt to flow out of it.

Description

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2.Topka pop.1, characterized by the fact that the nozzles for supplying the reducing agent are grouped by two opposite horizontal rows, the row placed on the connection side of the mixing chamber pr1 is compacted in height lower than the adjacent row.

3. PP1 and 2, that is, so that both chambers are cylindrical in shape, and the combustion chambers are located vertically.

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4. A furnace according to Claims 1 to 3, such that the mixing chamber has a chute for draining the liquid melt.

5. A furnace according to Claims 1-4, characterized in that it has a Vertically positioned complete combustion chamber with nozzles attached to the mixing chamber to remove trapped combustion products and liquid melt.

This invention relates to a sulphate liquor combustion technique and is intended for use in the pulp and paper industry.

A known sulphate lye cyclone furnace containing a lined combustion chamber with a burner, liquor supply pipes, auxiliary fuel and air, and a liquid melt collection tank with reducing agent supply and removal melting tubes connected to the combustion chamber of a lined mixing chamber with air of incomplete combustion products and tangentially installed nozzles for supplying air to both chambers lj.

However, in the known furnace there is no evidence of melt sulphidity.

The purpose of the invention is an increase in sulfidity)

The goal is achieved by the fact that in a cyclone furnace for burning sulphate liquor containing a lined combustion chamber with a burner, liquor supply pipes, auxiliary fuel and air, and a bath collecting liquid melt with reducing agent supply and removal pipes connected to the combustion chamber is a lined chamber air somnings: catfish of incomplete combustion products and tangentially installed branch pipes and air supply to both chambers, mixing chamber is inclined towards the chamber

incineration, ensuring the flow of liquid melt from it.

The supply nozzles should be restored grouped by two anti-glazing horizontal rows, and the row placed on the connection side of the mixing chamber is located at a height lower than the opposite one.

Both chambers may have a cylindrical shape, and the combustion chamber may be located vertically.

The mixing chamber has a chute for draining the liquid melt.

A vertically disposed complete combustion chamber with nozzles is attached to the mixing chamber to remove trapped combustion products and liquid melt.

FIG. 1 shows the proposed firebox; in fig. 2 shows section A-A in FIG. one; in fig. 3 - section bb nl fig. 2; FIG. 4 is a section B-B in FIG. one; in fig. 5 is a section of YYD in FIG. 2; in fig. 6 and 7 - a fire chamber with a full combustion chamber.

The sulphate liquor cyclone furnace contains a lined combustion chamber 1 with a burner 2, a nozzle 3 and 4 for feeding liquor, auxiliary fuel and air, and a liquid melt collection tank 5 with a supply pipe 6-8 for supplying the reducing agent to it and removing the melt attached to the combustion chamber lined an air-mixing chamber 9 for products of incomplete combustion and tangentially mounted nozzles 10 for supplying air to both chambers. The mixing chamber 9 is located with an inclination towards the combustion chamber 1 providing liquid melt flowing from it, and the nozzles 6 and 7 for feeding the reducing agent are grouped by two opposite horizontal rows, with the row that is located on the attachment side of the mixing chamber 9 located at a height below than its opposite row. Both chambers have a cylindrical shape, the combustion chamber 1 is located vertically. The displacement chamber 9 has a chute for draining the liquid melt (not shown). Position 11 denotes a nozzle for removal of combustion products into chamber 9. The nozzles for feeding liquor 3 are in the form of nozzles. The supply pipes 6 and 7 of the reducing agent have nozzles 12. The furnace has a vertical full combustion chamber 13, which contains a pipe 14 for removal of combustion products caught in it and a pipe 15 for the captured liquid melt. The proposed furnace works as follows. Liquor is supplied to chamber 1 through nozzles 3, air is supplied through nozzles 10 (in an amount insufficient to completely burn liquor, for example, c from 0.5-0.6) through burner 2 with native gas (or by adjusting fuel oil to burner nozzles ), and through pipe 4 - auxiliary fuel and air. In this case, it is possible to supply direct gas (or fuel oil) and air for its combustion and through a part of the nozzles 3 (adapted as burners or nozzles). In chamber 1, a process of a replacement incomplete combustion of components takes place with the formation of a reducing environment with products of incomplete combustion that contain gaseous reducing agents — carbon monoxide, hydrogen, methane, and other gaseous components, as well as solid reducing agent — carbon. Their torch is twisted along the vertical axis of the chamber (moves from top to bottom) due to the tangential arrangement of the nozzles 3 and nozzles 10. In the chamber, ash of liquor (t. 800-820 s) under the influence of the temperature of products of its incomplete 1 4.4 ranged 950-1100 s melts .and forms a liquid melt, which is centrifuged by the swirling torch and cast onto the vertical inner surface of the lining of the chamber walls and flows under the influence of gravity into the bath 5. Besides, before entering the nozzle 11, the centrifugal force of rotation of the fluid from the torch The melt is cast directly onto the upper surface of the liquid melt in the bath 5. As a result, the chamber effectively continuously film the liquid melt, both directly from the liquid melt in the bath and from the liquid melt film on the inner vertical surface of the lining, with which Moving the liquid down the film, the liquid melt continuously flows into the bath and collects in it. At the same time, during the flow of the liquid melt, as well as during the time it is located on the surface of the melt, the sodium sulfate contained in it interacts with gaseous and solid reducing agents in the reducing gaseous medium of the chamber. As a result, sodium sulfate is intensively reduced to sodium sulfide. The nozzles 6 and 7 (having nozzles 12) located at different heights are fed by jets of a gaseous reducing agent, which in the liquid melt enhance the rotation created by the torch of the products of incomplete combustion. It also provides intensive recovery of sodium sulfate up to 99%. The resulting liquid melt with almost the highest possible high sulfidity through pipe 8 is removed from bath 5. In pipe 11, as a result of tangential air supply through nozzles 10, acting in the direction of enhancing the rotation of the torch of the partial combustion products, a rotating torch of the mixed mixture of products of partial combustion with air from under the influence of centrifugal forces of the swirling plume (along the longitudinal axis of the pipe 11), the overwhelming part of the remaining insignificant amount of liquid melt contained in the mixture is discarded. This is a film trapping in this part of the liquid melt, which

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from the pipe 11, dispersed at an angle A, flows into the bath 5 (a gutter is provided for better drainage).

Next, the mixture flows tangentially into the vertical chamber 13 of complete combustion, in which the products of incomplete combustion burn down to form the products of complete combustion leaving the flue gases leaving through pipe 14. Accumulated in minor

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The quantity of liquid melt is removed from the chamber 13} through the nozzle 15.

Thus, the molten sulfide increases, since the part of the liquid melt flowing down into the bath from the pipe 11 does not undergo subsequent oxidation, as well as the degree of purification of the combustion products. Kpobfe addition, eliminates the possibility of

10 explosions.

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Claims (5)

1. CYCLONE HEATER FOR BURNING SULPHATE ALKALINE, containing a lined combustion chamber with a burner, nozzles for supplying liquor, auxiliary fuel and air, and a bath for collecting liquid melt with nozzles for supplying a reducing agent to it and removing melt, a lined chamber for mixing with air of incomplete products mixed with the combustion chamber combustion and tangentially installed nozzles for supplying air to both chambers, characterized in that, in order to increase the sulfide melt by intensifying the effect of the reducing agent on the entire volume of the melt while ensuring the explosion safety of the structure, the mixing chamber is inclined towards the combustion chamber, ensuring the flow of liquid melt from it. (L 2. Firebox pop. 1, distinguishing me by the fact that the pipes for supplying the reducing agent are grouped in two opposite horizontal rows, and the row located on the side of the mixing chamber is located lower in height than the row that pivots him. 3. Тппапо according to items 1 and 2, a personal note. the fact that both chambers are cylindrical in shape and the combustion chamber is located vertically. 4. The furnace according to claims 1 to 3, characterized in that the mixing chamber has a chute for draining liquid melt and 5. The furnace according to claims 1 to 4, characterized in that it has a yertically located complete combustion chamber attached to the mixing chamber with nozzles for removing combustion products and liquid melt trapped therein.