SU1150433A1 - Furnace - Google Patents

Abstract

1. A CURRENT, containing a cooling chamber with screens and connected to its lower part shielded vertical pre-furnaces with cold funnels, characterized in that, in order to increase reliability, the pre-furnaces are arranged in one row with a step equal to

Description

I The invention relates to the combustion of fuel and can be used at Tagov power plants. Fireboxes are known, the contents of a cooling chamber with screens, connected to a shielded combustion chamber with a cold funnel and burners lj. The disadvantage of these devices is low reliability due to increased temperature unevenness during load control. The known furnace containing a cooling chamber with screens and shielded vertical pre-furnaces with cold funnels connected to its lower part. 2 The disadvantage of this device is also reduced reliability due to uneven terasures of the screens in front of the screens during load changes on the front furnaces. The purpose of the invention is to increase reliability. The goal is achieved by the fact that in the furnace 5 containing a cooling chamber with screens and shielded vertical pre-furnaces with cold funnels connected to its lower part, the pre-furnaces are located in one row with a step, equal to, (1,1-2j5) bj where bj, is the width the front furnaces, and are connected to the cooling chamber by means of double-sided slopes with an angle at the verpine of 60-t20f, with the tops of the ramp from the atyrms located at a distance of (0.25-1.5) b. In addition, each pre-furnace can be equipped with air supply nozzles installed along the slopes of the cold funnel 5 and gas intake mines, the exit window of each of which is located below the nozzle at a distance equal to (0.2-1.2) bt, nozzles and hectares, zozabornye mines are formed by screens of slopes of a cold funnel. In FIG. 1, a furnace is shown (option 1), a longitudinal section; in FIG. 2, section A-A in FIG. one; in fig. E section .B-B in figure 1; in FIG. 4, node 1 in FIG. 1 in FIG. 5. Pka (option 2), a longitudinal section. The furnace contains a cooling chamber 1 with screens 2 and connected to its lower part by means of double-sided slopes 3 shielded vertical pre-furnaces 4 with refrigerating funnels 5, burners 6 and recirculation gas supply nozzles 7. The two-sided 33and slope 3 is made with a vertex angle of 60-120, and their apex is located from the screen 2 at a distance H of (0.25-1.5) from the width b, pre-furnace 4. The pre-furnace 4 is located in one the row with step L equal to (1.12, 5) b ||. The furnaces 4 can be equipped with air supply nozzles 8 installed along the slopes of the cold funnel 5 and gas intake mines 9 with an exit window 10. which is located below the nozzle 8 at a distance h equal to (Oj2-1.2) bft. The nozzles 8 and gas intake shafts 9 are formed by screens of slopes 3 of the cold funnel 5. Cooling chamber 1 is equipped with hatches 11 in which the blowing or acoustic cleaning devices can be placed. The firebox works as follows. Through the burner 6, an air-fuel mixture is supplied, which forms combustion products that are carried out under the action of vacuum and temperature difference — upwards to the screens 2. Gases are cooled sharply in the screens 2. Subsequently, the combustion products enter the convective heating surfaces of the boiler and are evacuated with a smoke exhauster through the stack to the atmosphere. In the process of their cold sinks 5, the front furnace 4 produces gas intake through windows 10 and shafts 9 for suips of fuel into the dust system. .At the same time, to reduce the mechanical underburning of the separators in the cold funnel 5 particles of large fractions, sharp blast (tertiary air) is introduced through the nozzles 8. switching modes of the burners 6, unpaved operation of the mines 9. To increase the reliability of the operation of the screens 2, recirculation gases can be introduced through the nozzles 7, and blowing devices (or acoustic cleaning) can be installed in the hatches I1. Due to the arrangement of the pre-furnaces 4 in one row with a pitch (piers), it is possible to set the burner b tangentially, i.e. according to the most advantageous combustion scheme, which allows 31; {) efficiently burn fuel and cool the products of combustion by the walls of the pre-furnaces. At the same time, the walls are allowed to assemble the recirculation nozzles 7 also by a tangential scheme, which

311504334

provides the most efficient way this device

reduction of non-uniformity (if the subsequent reduction of non-uniformity doesn’t have time to be eliminated in the pre-temperature of the gases in front of the screen 2 of the cocks 4, for example, during combustion, the cooling measures that would increase the ignition of the ignited coals) .5.

FIG. 2

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Claims (2)

1. A HEATER containing a cooling chamber with screens and shielded vertical pre-furnaces with cold funnels connected to its lower part, characterized in that, in order to increase reliability, the pre-furnaces are arranged in a row with a step equal to (1 _f 1—2, 5) b _n , (where the width of the pre-furnace) and attached to the cooling chamber using bilateral slopes with an angle at the apex of 60-120 * and the tops of the slopes from the screens are located at a distance of (0.25-1.5) b _p . 2. Firebox pop. 1, characterized in that each preheater 3 is equipped with air supply nozzles installed along the slopes of the cold funnel and gas intake shafts, the outlet window of each of which is located below the nozzle at a distance equal to (0.2-1.2) |> _n , moreover, nozzles and gas intake shafts are formed by screens of chutes of a cold funnel.