SU1402764A1 - Boiler furnace - Google Patents

Abstract

Invention m. B. used in furnaces of fluidized bed boilers. The purpose of the invention is to reduce ablation and intensify fuel burnout and heat transfer. The heating surface is immersed in the fluidized bed (CS) 2 of the gas distribution grid 1 and is made in the form of panels of pipes. The upper pipe sections are located above the CS with the formation of a convex arch 4 and have fins (P) in its zone, and the lower ones are connected to the collectors 7, are installed vertically and are made without P. The collectors 7 are located in the COP and form recirculation gaps 10 with the walls 8 Part II has slotted holes and alternates with solid P. The holes in the neighboring Ps are shifted to each other, the heat exchanger bundle 12 is placed in KS 2, and the branch pipes 13 ash ash m. B. installed at the level of vertical pipe sections. 1 3. p. F-ly, 4 ill.

Description

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1402764

The invention relates to a power system and can be used in furnaces of boilers with a pseE) water-free layer.

The purpose of the invention is to reduce ablation, as well as the intensification of fuel burnout and heat transfer.

FIG. 1 shows the boiler furnace, RPM, type; in fig. 2 - the upper part of the panels; in fig. 3 is a section A-A in FIG. 2; in fig. 4 is a view B in FIG. 1 (view on the panel).

The boiler furnace contains a gas distribution grid 1 with a fluidized bed 2 and a heating surface immersed in the latter in the form of panels of pipes 3, the upper portions of which are arranged to form at least one convex arch 4, are equipped with fins 5 and 6 in the last zone and above the ridge, they are layer 2, and the lower ones are connected to the collectors 7, installed vertically and made without fins. The walls 8 of the firebox in the lower part are made in the form of slopes 9, and the collectors 7 are located in layer 2 and form recirculation gaps 10 with walls 8. The fins 5 are made with slit holes 11 and 11, and the fins without holes are floated. Alternate with the fins 5. The holes 11 are offset from the holes 11 in the corresponding adjacent fins 5. Layer 2 contains a heat exchange bundle 12. The furnace also contains nozzles 13 of slou ash, which can be installed at the level of the I vertical pipe sections of the 3 panels.

I The boiler furnace works as follows.

 When fuel is burned into the space above the fluidized bed 2, particles of different fractional composition are ejected. The main part of the particles, hitting the arch 4, returns back to the layer 2, while the smaller particles are grouped into clumps on the fins 6 without holes and slide down. A small part of the particles flies with the gas through the holes 11 of the fins 5 and enters the space above the roof 4. Here the gas velocity drops sharply, which ensures the particles fall out of the stream to roof 4, and then through the recirculation gap 10 back into layer 2. For more the deep degree of purification of gases from particles, the number of arches 4 can be increased. With a significant decrease in the living section of the arch 4 (total area of the holes 11) below it

a pressure region is formed, which improves the structure of the layer and reduces the entrainment of fine-grained material.

The displacement of the holes 11 in the corresponding adjacent fins 5 also contributes to a decrease in entrainment, since the probability of particles hitting the roof 4 increases. The location of the collectors 7 in the layer near the wall 8 contributes to the material’s downward movement along the gap m 10 along the wall 8, as the collectors 7 they shield the near-wall zone from gas bubbles rising from below; in addition, heat removal per unit volume of the fire chamber increases. Ash removal is carried out by means of nozzles 13, which extract ash from

5 walls 8. Since the particle size here is small, the probability of a more complete burnout of fuel is maximal, and the temperature is minimal, which reduces losses with physical heat of ash and increases

Q Efficiency of the firebox. Making the furnace wall 8 in the lower part in the form of slopes 9 improves the circulation of the dispersed material in the near-wall part of the layer 2.

Claims (2)

Invention Formula 5 1. A boiler furnace containing a gas distribution grid with a fluidized bed and a heating surface immersed in the latter in the form of panels of pipes, the upper parts of which are arranged to form at least one convex arch and are fitted with fins, and the lower ones are connected to collectors, and these fins are made with slit holes, and a heat-beam bundle, as well as an ash discharge nozzle, characterized in that, in order to reduce entrainment, as well as  intensification of fuel burnout and heat transfer, the upper sections of the panel pipes forming the arch are located above the fluidized bed, and the lower ones are installed vertically and are made without fins, the walls of the firebox in the lower part are made in the form of slopes, and the collectors are located in the layer and form the fireboxes of the recirculation gaps, the fins of the other part are solid and placed, alternating with the fins of the first 5 parts, the holes in which are offset from the holes in the corresponding adjacent fins, and the aforementioned heat exchange beam is located in a fluidized bed. 2. The furnace according to claim 1, characterized in that the ash discharge pipes are installed at the level of the vertical sections of the panel. -/one .3 Buff 6 Srig.