CN2361985Y - Secondary air supply device for scheme arch of small boiler - Google Patents

Abstract

The utility model relates to a secondary air supply device for the scheme arch of the small boiler, which is a burning system of the small boiler. The inner wall of the scheme arch forms a circular arc shape. The cross section forms a horseshoe shape. A ventilating chamber is arranged in the scheme arch. The ventilating chamber is communicated with a main air pipe by using an auxiliary air pipe. The middle lower part of the inner wall of the circular-arc-shaped scheme arch is evenly distributed with one or two rows air holes along the longitude line of the cross section, each row of air holes are provided with four to twenty elevation angles alpha, and each alpha is 0 to 60 DEG. The air holes are communicated with a ventilating chamber. The utility model improves the operating condition of the boiler combustion, strengthens the combustion, prevents the smoke gas to directly enter into the flue, prolongs the stay time of the smoke gas in the boiler, improves the heat efficiency of the boiler, and reduces the concentration of emission of the smoke gas. The utility model has the advantages of simple structure, convenient installation, and reliable use.

Description

A kind of miniature boiler circular arch secondary air supply device

The utility model relates to the combustion system of miniature boiler.

Existing miniature boiler is not generally established arch, both made the miniature boiler of having established arch also not have secondary air supply device, with arch with the secondary air supply device organic assembling, do not see as yet in the literature, generally there are following shortcoming in this nothing arch and the miniature boiler that does not have a secondary air supply device: the one, and the thermal efficiency of boiler is not high; The 2nd, it is insufficient to burn; The 3rd, soot emissions do not reach environmental requirement.

Deficiency at above-mentioned miniature boiler existence, the utility model proposes the circular arch secondary air supply device of a kind of miniature boiler arch and secondary air supply device organic assembling, its objective is the burning quality that improves miniature boiler, reduce smoke discharge amount, make miniature boiler reach energy-conservation, fall dirt.

The technical scheme that the utility model is taked is a kind of miniature boiler circular arc secondary air supply device, the inwall that it is characterized in that arch (2) is a circular arc, cross section is a shape of a hoof, have vented cavity (4) in the arch (2), logical inner chamber (4) utilizes secondary airduct (7) to be connected with air main (6), the middle and lower part of arch (2) circular arc inwall is along the uniform 1-2 row of the warp of cross section, 4-20 wind hole (3) that has angle of elevation alpha of every row.α is 0-60 °, and wind hole (3) are connected with vented cavity (4).

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the utility model front view.

Fig. 2 is Figure 1A-A view.

Among the figure, 1 flue; 2 circular arches, 3 wind holes; 4 vented cavities; 5 fire grates; 6 air mains, 7 secondary airducts.

When the utility model is installed, circular arch (2) is installed in the burner hearth of miniature boiler, on the fire grate (5), utilize the circular arc arch face to form new burner hearth, with secondary airduct (7) air main (6) is connected with vented cavity (4), the sectional area of secondary airduct (7) is greater than all wind hole (3) sectional area sums, and the vertical section of vented cavity (4) is long-pending also greater than all wind hole (3) sectional area sums, and is not less than the sectional area of secondary airduct (7).

During the utility model work, air main (6) carries out giving the first time wind to boiler under fire grate (5), make boiler combustion abundant, simultaneously, utilize secondary airduct (7), in the vented cavity (4) in the importing circular arch of the wind in the air main (6) (2), during boiler combustion, circular arch (2) is heated, and temperature is higher, and the wind in the importing vented cavity (4) is by the instantaneous heating of circular arch (2), and heated wind sprays from wind hole (3) along α angle burner hearth, air capacity deficiency during with the supplementary furnace chamber inner combustion makes flue gas fully mix with air and burns.When the miniature boiler volume was big, wind hole (3) were 2 rows, and every row's quantity is more, otherwise the negligible amounts of wind hole (3) is single, and α decides on furnace height at the angle, the major control flame height.Present embodiment is single 8 wind holes (3), and the α angle is 30 °.The bootable flue gas flow direction of circular arch (2), the prolong smoke flow process makes burning more abundant, and secondary is mended wind makes burning more perfect, reaches the purpose of energy-saving and pollution-reducing.

The utility model has been broken original large-scale (horizontal) boiler and has been encircleed the restriction that can not be applied on small stationary formula grate furnace, the especially vertical boiler, and has created a kind of new arch.The circular arc chimney arch that is provided with has reached secondary air supply device and chimney arch organic assembling to have improved boiler combustion operating mode, overheavy firing, the time of staying of prolong smoke in burner hearth, reduce furnace cooling factor, guarantee burner hearth high temperature, stop that flue gas directly enters flue, improved the thermal efficiency of boiler, and having reduced smoke dust discharge concentration, soot emissions are lower than the GB13271-91 standard-required, and simple in structure, easy for installation, use reliable.

Claims (1)

1. A kind of miniature boiler circular arch secondary air supply device, the inwall that it is characterized in that arch (2) is a circular arc, cross section is a shape of a hoof, have vented cavity (4) in the arch (2), vented cavity (4) utilizes secondary airduct (7) to be connected with air main (6), the middle and lower part of arch (2) circular arc inwall, along the uniform 1-2 row of cross section radial line, every row 4-20 has the elevation angle.The wind hole (3) of α, α is 0-60 °, wind hole (3) are connected with vented cavity (4).

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