SU1415004A2 - Power and steam boiler plant - Google Patents

Abstract

The invention relates to boiler construction and can be used in magnesium recovery boilers used in cellulose production lines. The aim of the invention is to increase the efficiency of the process of regeneration of sulphite liquors. The energy boiler contains uncooled cyclone combustion chambers 1 equipped with devices 2 and 3 for supplying fuel and primary air, cooled afterburning chamber 4 equipped with nozzles 5 and 6 for supplying secondary air located in planes perpendicular to the longitudinal axis of after-burning chamber 4, cold a funnel 7, an ash removal device 8, a shielded cooling chamber 9, a superheater 10, water economizers 11 and 12, air heaters 13 and 14, and a window 15 for the gases to escape. The longitudinal axes of the cyclone combustion chambers 1 are inclined to the planes of nozzles 5 and 6 and intersect on the longitudinal axis of the afterburning chamber 4. Large drops of the sulfite shell that are unburnt in the cyclone chamber 1 of combustion fall on it and, after drying, burn down, entering the afterburning chamber 4. The streams of combustion products and unburned liquor collide in the center of the afterburner, ensuring mixing and combustion. 2 Il. iS (L

Description

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The invention relates to the boiler industry, can be used in energy and energy technology boilers, which, for technological reasons, require limiting the combustion temperature, for example, magnesium recovery boilers used in cellulose production lines for burning sulphite liquors that are used during the pulping process and regenerated chemically. active magnesium oxide with simultaneous use of heat to form steam, and is an improvement of the invention according to . St. No. 838288.

The purpose of the invention is to increase the efficiency of the process of sulfite liquor regeneration.

FIG. Figure 1 shows schematically the proposed boiler unit, a section along the longitudinal axes of the chambers; in fig. 2 shows section A-A in FIG. one.

An energy-technology boiler consists of uncooled cyclone combustion chambers 1 equipped with fuel supply devices 2 and devices 3 for supplying primary air, cooled (screened) after-burning chamber 4, equipped with coppers snuffled 5 and 6 for secondary air, cold funnel 7 and device 8 for removal ash, shielded cooling chamber 9, superheater 10, water economizers 11 and 12, and air heaters 13 and 14. Tiers of nozzles 5 and b for supplying secondary air are located in planes, perpend The acoustic longitudinal axis of the afterburner chamber 4 and the longitudinal axes of the cyclone combustion chambers 1 are inclined to these planes and intersect along the longitudinal axis of the afterburner chamber 4. The boiler is equipped with a window 15 for the exit of combustion products.

Energy technology boiler operates as follows.

The spent sulphite liquor is supplied by means of devices 2 to uncooled cyclone chambers 1 together with primary air supplied by devices 3, while the amount of primary air is sufficient to burn only part of the fuel. The streams of combustion products and unburned fuel, heated to the temperature of the combustion products, enter the afterburning chamber 4, where they are partially cooled due to radiation heat exchange with its screens in the path of 1-2.5 equivalent diameters from the mouth of the cyclone chambers to the first floor of the secondary air nozzles 5, collide among themselves, spraying and mixing with the secondary air supplied in the russ of the nozzles 5, partially (or completely) are burned while being cooled due to the radiation heat exchange with the screens of the afterburner 4 and the windows dozhigayutsya mixing with

secondary air from rus nozzles 6.

Further, the products of combustion come in

cooling chamber 9, where it is cooled

radiation exchange account with its screens

then cooled with a superheater 10,

fuel atomizers 11 and 12 and air preheaters 13 and 14. The cooled gases leave the energy technology unit through the window 15, and the heat they give off is used to heat and evaporate water, superheat steam and preheat the air necessary for combustion.

In the combustion process, magnesium oxide is regenerated, which is discharged as fine powder (ash) in a cold funnel 7, from where it is removed using device 8.

In this design of the boiler unit, large sulfite liquor droplets unburned in the cyclone Combustion Chamber fall onto the lower part of the inner surface of this chamber, flow down it, subtitling at the same time, and burn down, entering the afterburning chamber. The streams of products of combustion and unburnt liquor collide with each other in the center (in plan) of the afterburner, ensuring good mixing and spraying. In this case, the flows leaving the afterburning chambers can be given a mutually opposite direction of twist, which also improves the spraying of the fuel when the flows collide. All this makes it possible to increase the efficiency of the process during the regeneration of sulphite liquors.

At the same time, the torch core is located in the central part (in plan) of the afterburner chamber, which increases the reliability of its screens.

The design of the boiler unit allows, by improving the organization of the supply of sulfite liquors for combustion, to increase the efficiency of the process of their regeneration and the reliability of the boiler unit operation.

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Claims (1)

Invention Formula Energy technology boiler auth. St. No. 838288, characterized in that, in order to increase the efficiency of the regeneration of sulphite liquors, the cyclone combustion chambers are inclined on the afterburner chamber so that their longitudinal axes intersect with the nozzle plane for secondary air supply, and the intersection point lies on the longitudinal axis of the afterburner chamber.