SU1521987A1 - Boiler unit - Google Patents

Abstract

The invention relates to the combustion of fuel, can be used in thermal power plants, and allows for greater efficiency. The boiler unit contains a boiler with a furnace 1, having pulverized coal burners 2 and a waste burner 3, and a dust preparation system with a gas intake shaft 4, a fan mill 5 and the main and additional dust concentrators 6 and 7 divided by partitions 8 and 15 into sections 9 and 16, interconnected by nozzles 11 and 18, respectively, removing the concentrated mixture and introducing dust. The fuel from the fan mill 5 enters the dust concentrator 6, from where the separated dust enters the dust concentrator 7, where the gases coming from the furnace 1 through the shaft 4 are heated and heat treated. Concentrated heat-treated dust from sections 16 through pipes 19 enters the combustion in burner 2. To improve separation, heat treatment and aerodynamics section 16 is made in the form of two cylindrical parts 24 and 25 with tapered bottoms connected by a cylindrical insert 26. 3 Il.

Description

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The invention relates to the incineration of t (fuel and can be used at 1} thermal power plants,

The purpose of the invention is to improve the economic efficiency of

i FIG. 1 schematically shows the proposed boiler unit; in fig. 2 is a section A-A in FIG. 1; on figo 3 section bb figo K

The boiler unit contains a boiler, the furnace 1 of which is equipped with a duster-shaped pulverized coal burner 2 and a waste burner 3, and a dust preparation system with a gas intake shaft 4 connected to the furnace 1, the Fan Mill 5 and the main | and additional concentrators | 6 and 7. Dust concentrator 6 is supplied with transverse partitions 8, section it is divided into section 9, communicating with each other bypass pipes 10 and equipped with tangential nozzles

II of the concentrated mixture, the input of the main dust concentrator 6 is equipped with a swirler 12 and connected to the mill-fan 5, and the output is equipped with a waste pipe 13 connected to the flue 1 to the waste burned

Sections 9 and 1b of the dust concentrators b and 7 can be made in the form of snails.

The boiler unit works as follows.

The raw fuel enters the inlet 27 into the suction inlet of the mill-fan 5, where the drying agent (flue gases) is simultaneously supplied through the shaft k through the dust concentrator 7o. The temperature of the drying agent is controlled by the amount of cold recirculation gases k fed through the 28 V pipeline the mill-fan 5, the fuel is crushed and dried and then enters the main dust concentrator 6, in which the spent drying agent is separated and together with moisture through the waste pipe 13 is fed to the waste burners 3, It is burned. Burners 3 are located above the core of the flame of the flame, which reduces the formation of nitrogen oxides o Through pipes 11 of the dust center

ke 3 fireboxes 1 "Additional dust collector 6 of each section 9 and gas concentrating unit 7 are provided with transverse partitions 15 dividing it into sections 16 interconnected by means of overflow pipes 17 and equipped with tangential nozzles 18 and 19 for introducing dust and removing the concentrated mixture. The inlet of the additional dust concentrator 7 is provided with a swirler 20 and connected to the gas intake shaft k, to the outlet a waste pipe 21 is connected to the inlet of the mill-fan 5o. The dust inlet pipes 18 of the sections 1b of the additional dust concentrator 7 are connected by ducts 22 to the outlet pipes 11 of the concentrated mixture of the corresponding section 9 of the main the dust concentrator 6, and the nozzles 19 for discharging the concentrated mixture - by the flue pipes 23 with dust-burning burners 2 of their own. .2A and 25 with tapered bottoms connected by a cylindrical insert 2b. To the suction of the mill-fan 5 is connected to the heat of the raw coal 27. Gas recirculation gas 28 is connected to gas intake shaft A Burners 2 firebox 1 is equipped with air ejectors 29.

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Separated concentrated dust is fed into the tangential nozzles 18 of the dust concentrator 7, where the flue gases from the Pod.cha pit of the concentrated aero mix are fed through the nozzles 18 simultaneously with the swirler 20 "Concentrated dust separated from the moisture, subjected to the swept flow by the swirler 20". flue gases, resulting in the destruction of fuel with the release of non-combustible gas ballast, the amount of which, depending on the quality of coal, can fluctuate c widely After heat treatment in sections 1b of the dust concentrator 7, the fuel is again separated from the drying agent and gas ballast using overflow pipes 17 separating the aerosol mixture, and the gas ballast is sucked through the waste pipe 21 of the concentrator 7 into the mill-fan 5, and the concentrated dried dust through the nozzles 19 enters the burners 2 of the furnace 1 by means of air ejectors 29, where it effectively burns, since it does not contain non-combustible impurities.

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Separated concentrated dust is fed into the tangential nozzles 18 of the dust concentrator 7, where the flue gases from the Pod.cha pit of the concentrated aero mix are fed through the nozzles 18 in parallel with the swirler 20 "Concentrated dust separated from the moisture, exposes heat treatment by flue gases, which results in the destruction of fuel with the release of non-combustible gas ballast from it, the amount of which, depending on the quality of coal, can fluctuate In a wide range After heat treatment in sections 1b of the dust concentrator 7, the fuel is again separated from the drying agent and gas ballast by means of overflow pipes 17 separating the aerosol, and the gas ballast is sucked through the waste pipe 21 of the dust concentrator 7 into the mill-fan 5, and the concentrated dried dust through the nozzles 19 enters the burners 2 of the furnace 1 by means of air ejectors 29, where it effectively burns, since it does not contain non-combustible impurities.

The vacuum in the dust concentrator 7, created by the mill 5, provides an effective spinning of the air mixture due to the reduced pressure in the center of the dust concentrator 7, which contributes to a more complete separation of dust from the drying agent and non-combustible ballast and increases the temperature in the flame core. Moreover, the fine dust does not fall into mill-fan 5, as it burns due to the residual oxygen contained in the flue gases, which ensures the explosion safety of the mill-fan 5o. Flue gas supply to the mill-fan p is 5, not containing oxygen, allows to increase the operating temperature of a drying agent, which provides a more efficient removal of moisture. In order to provide higher temperatures for the drying agent of the dust collector casing 6 {and 7 and the discharge pipe 21 can be made shielded, shotcrete from the inside. This ensures the operation of the dust concentrator 7 in the partial combustion mode of finely dispersed dust due to residual oxygen in the flue gases, to work as a dust collector at 300 ° C

cent () of ator 6 at temperatures (in terms of dust) without the danger of explosion of the fan mill 5 o To ensure a tangled twist of flows in the dust concentrator 6 and 7, the blades of the swirlers 12 and 20 are inclined to the opposite

, to the side

(Performing sections 1b in the form of two cylinders 2 and 25 with tapered heads, connected by a cylindrical intake bar 26, improves aerodynamics and separation method

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Claims (1)

nosti sections 1b and reduce aerodynamic drag. Claims of the invention: A boiler unit containing a boiler with a furnace equipped with river-mounted pulverized coal burners and a waste burner, and a pulverizer preparation system with a gas intake shaft connected to the furnace, a fan mill and main and supplementary dust concentrators, the inlet of which is provided with a swirler and connected respectively, to a fan-fan and a gas intake shaft, with the discharge pipe of the main and additional dust concentrators connected respectively to the discharge burner of the furnace and to the suction side of the mill The fan knots, the tailpipes for discharging the concentrated mixture of these dust concentrators are connected respectively to the dust feed pipes of the additional dust concentrator and pulverized coal burners, and the drain pipes for the concentrated mixture of the main dust concentrator and the dust feed ports of the additional dust concentrator are tangential, in order to save them dust collectors are provided with transverse partitions dividing them into sections communicating with each other by-pass pipe The nozzles of the outlet for the concentrated mixture are installed in each section of the primary and secondary dust concentrators, and each section of the additional dust concentrator is made in the form of two cylinders with tapered heads connected by a cylindrical insert. 17 gjue.3