CN2175648Y - Guide blade whirlwind tube with double cone dust removing structure - Google Patents

Abstract

The utility model relates to a guide blade whirlwind tube with a double cone dust removing structure. The utility model is the improvement of a whirlwind separator. The utility model is composed of a guide blade, an air rising tube, a core tube structure, an outer barrel body and the double cone dust removing structure. The double cone dust removing structure is formed by two cone bodies in a superposition way and is installed on the lower end of the whirlwind tube. The small mouth end of an upper cone body is arranged in the large mouth end of a lower cone body, and the wall approaching the large mouth end of the lower cone body is provided with symmetrical dust removing holes. The cone apex angles of the upper cone body and the lower cone body of the double cone dust removing structure are both from 20 DEG to 45 DEG. The bottom surface area of the lower cone body is 1.5-3.5 times of the area of the lower mouth of the upper cone body, and the length of each cone bodies is 0.8-1.5 times of the diameter of each cone bottom. The total area of the symmetrical dust removing holes on the wall of the lower cone body is 2.5 %-8.0 % of the area of the lower mouth of the lower cone body, and other sizes must optimally match with the size of the used guide blade and the core tube structure mutually.

Description

Guide blade whirlwind tube with double cone dust removing structure

The utility model relate to a kind of from dusty gas the used guide vane cyclone tube of vertical pipe type multicyclone of separating solids particulate.

Guide vane cyclone tube commonly used now is made up of quadrature guide vane, riser, outer cylinder body and blowdown dish etc.The present ubiquitous problem of this guide vane cyclone tube is because inner various secondary eddy current and the ash bucket that exists returns gas, carries thin dirt secretly back-mixing easily and escapes from riser, and is not high to the separative efficiency of thin dirt (10 μ m are following).Simultaneously, in the multicyclone that many tornadotrons are formed, because shared inlet and outlet chamber and ash bucket are arranged, can produce the channelling air-teturning mixed phenomenon between tornadotron again, the problem that above-mentioned thin dirt back-mixing is escaped from riser is more outstanding.

For addressing the above problem,, many research work have all been carried out both at home and abroad to improve the efficient of tornadotron separate fine particles.As BP 1411136(1972) propose the lower end blowdown dish of straight pipe type tornadotron is removed, can form the rotating flow barrier at the dust-exhausting port place, prevent that thin dirt back-mixing from going in, solved the dust discharge blocking problem again.The clear 56-40636(1978 of Japan Patent) and clear 56-48219(1978) be the dust discharge base plate that a center band reverse taper is installed at dust-exhausting port place, straight pipe type tornadotron lower end, have dust exhausting hole and air-teturning hole on the back taper, can reduce thin dirt back-mixing, change the ash-laden gas inlet into the multiple tracks tangential inlet simultaneously.The patent No. is that 86100974.6 Chinese invention patent mainly is to adorn one " shunting core tube " at the exhaust entrance place of tornadotron, can raise the efficiency effectively.Simultaneously Chinese utility application (93216798.5) being arranged again, mainly is to have added one " anti-back-mixing awl " at the dust-exhausting port place of general tangential inlet formula cyclone separator, can reduce the gas that returns of ash bucket effectively and carry thin dirt problem secretly.

The purpose of this utility model provides a kind of new and effective guide vane cyclone tube with bipyramid dust outlet geometry.

The purpose of this utility model is achieved in that the lower end at the straight pipe type guide vane cyclone tube, the bipyramid dust outlet geometry of unique design is installed, pack into the big opening end of lower cone of the osculum end of upper cone, be formed by stacking, the size of this bipyramid dust outlet geometry must make to optimize coupling with used guide vane size and core tubular construction.1. working as guide vane inner edge angle of outlet β 1 is 18 °～26 °, outer rim angle of outlet β 2 is 20 °～30 °, when the core tubular construction adopts shunting core tube, the physical dimension of its bipyramid is: the lower port diameter of upper cone is 0.40～0.55 times of tornadotron outer cylinder body interior diameter, the following open area of lower cone be upper cone following open area 30% to 55%; 2. working as guide vane inner edge angle of outlet β 1 is 15 °～26 °, outer rim angle of outlet β 2 is 13 °～30 °, the core tubular construction adopts the reducing core barrel, when the reducing lower port diameter is 0.3～0.9 times of overall diameter of riser, the lower port diameter of upper cone is 0.50～0.68 times of interior diameter of tornadotron outer cylinder body, the following open area of lower cone be upper cone following open area 40%～80%.The cone-apex angle of last lower cone is 20 °～45 °, the floor space of lower cone is 1.5～3.5 times of following open area of upper cone, cone length is 0.8～1.5 times of cone bottom diameter, the gross area that has a dust exhausting hole (can be slit or circular hole) of symmetry near the bottom of lower cone be under the lower cone open area 2.5%～8.0%.The key of the optimization of guide vane, core pipe and bipyramid dust outlet geometry coupling is that will to make the ash bucket pressure drop of tornadotron be 55%～85% of whole pressure drops.

Accompanying drawing 1 is the structural representation of the guide vane cyclone tube with bipyramid dust outlet geometry that proposes according to the utility model;

Accompanying drawing 2 is schematic diagrames of the bipyramid dust outlet geometry that proposes according to the utility model.

Among the figure, 1-riser, 2-guide vane, 3-outer cylinder body, 4-core tubular construction, 5-upper cone, the 6-ash bucket, 7-lower cone, 8-core pipe cone, 9-core pipe end opening, 10-upper cone, the 11-annular roof plate, 12-dust exhausting hole, 13-upper cone end opening, 14-lower cone, 15-lower cone end opening.

Dusty gas is axially transferred to then earlier by guide vane 2 and tangentially enters tornadotron cylindrical shell 3, dust wherein is under the centrifugal action that the High Rotation Speed air-flow produces, got rid of to the inwall of tornadotron cylindrical shell 8 and upper cone 10, dust flows downward under Action of Gravity Field, enter lower cone 7 through upper cone end opening 13, enter in the ash bucket 6 through lower cone end opening 15. Part concentrates in the dust at annular roof plate 11 places of lower cone 7, can enter in the ash bucket 6 by dust exhausting hole 12. Because " shielding " of the swirling eddy at lower cone end opening 15 places effect, can reduce effectively that thin dirt in the ash bucket 6 is returned that gas is carried secretly and the back-mixing effect that takes place, while is owing to upper/lower cone dust discharge size gradually reducing, can reduce again and enter ash bucket tolerance, also can effectively reduce ash bucket back-mixing gas and carry thin dirt problem secretly, so but Effective Raise efficient.

In order to show better the advantage with guide vane cyclone tube of bipyramid dust outlet geometry of the present invention, illustrate with embodiment below.

Embodiment 1, and adopting diameter is the tornadotron of 250mm, and guide vane is the quadrature hybrid type, and interior directrix angle of outlet β 1 is 25 °, and outer directrix angle of outlet β 2 is 30 °, and the core pipe adopts shunting core tube.By requirement of the present utility model, the optimization size of the bipyramid dust outlet geometry that designing institute adopts should be: the cone-apex angle of upper cone is 30 °, and the lower port diameter of upper cone is 125mm; The end diameter of lower cone is 200mm, and the lower port diameter of lower cone is 85mm, and the cone-apex angle of lower cone is 32 °; Dust exhausting hole on the lower cone is of a size of φ 6(mm) * 4 * 2.Carry out cold test with 325 order talcum powder, entrance concentration is 1g/m ³, import tolerance is 2200m ³/ h, it is 2% that ash bucket loses heart, its separative efficiency can reach 96.23%, all the about 15KPa of pressure drop.Comparative example 1 adopts as implementing the tornadotron of guide vane and core tubular construction as described in 1, and the bipyramid dust outlet geometry is not installed, and carries out cold test with 325 order talcum powder, and entrance concentration is 1g/m ³, import tolerance is 2200m ³/ h, it is 2% that ash bucket loses heart, its separative efficiency is 93.3%, all the about 15KPa of pressure drop.

Embodiment 2, and adopting diameter is the tornadotron of 250mm, and guide vane is a forward direction secant type, and inner edge angle of outlet β 1 is 25 °, and border line angle of outlet β 2 is 30 °, and the core pipe is the reducing type, and its lower port diameter is 125mm.By requirement of the present invention, the optimization of the bipyramid dust outlet geometry that designing institute is used is of a size of: the cone-apex angle of epicone is 26 °, and the lower port diameter of upper cone is 162mm; The end diameter of lower cone is 220mm, and the lower port diameter of lower cone is 96mm, and the cone-apex angle of lower cone is 33 °, and the dust exhausting hole on the lower cone is of a size of φ 6(mm) * 5 * 2.Carry out cold test with 325 order talcum powder, entrance concentration is 1g/m ³, import tolerance is 2180m ³/ h, it is 2% that ash bucket loses heart, and its separative efficiency is 94.47%, and all pressure drop is about 13KPa.Comparative example 2 adopts the tornadotron as embodiment 2 described guide vanes and core tubular construction, and the bipyramid dust outlet geometry is not installed, carry out cold test with 325 order talcum powder, operating condition is described with embodiment 2, and its separative efficiency is 90.34%, and all pressure drop is about 13KPa.

This tornadotron with bipyramid dust outlet geometry is formed the recovery that the vertical pipe type multicyclone can be applicable to dedusting, purification and the solid particle of petrochemical plant high temperature dust gas, also can be applicable to industrial departments such as coal fired power generation, coal gasification, plastics, chemical industry, cement, light industry.

Claims (2)

1, a kind of guide vane cyclone tube with bipyramid dust outlet geometry, by guide vane, riser, the core tubular construction, outer cylinder body and bipyramid dust outlet geometry are formed, it is characterized in that the bipyramid dust outlet geometry being installed in the lower end of tornadotron, two cone stacks are installed, the end opening of upper cone is packed in the lower cone, on the close sidewall of lower cone upper bottom portion, have the dust exhausting hole of symmetry, the cone-apex angle of the last lower cone of bipyramid dust outlet geometry is 20 °～45 °, the floor space of lower cone is 1.5～3.5 times of following open area of upper cone, cone length is 0.8～1.5 times of diameter at the bottom of the cone, the gross area of the symmetrical dust exhausting hole on the lower cone wall be under the lower cone open area 2.5%～8.0%, other size of bipyramid dust outlet geometry must be optimized coupling mutually with used stator size and core tubular construction.

2, guide vane cyclone tube with bipyramid dust outlet geometry according to claim 1, it is characterized in that: when guide vane inner edge angle of outlet β 1 is 18 °～26 °, outer rim angle of outlet β 2 is 20 °～30 °, when the core tubular construction adopts shunting core tube, the physical dimension of its bipyramid is: the lower port diameter of upper cone is 0.40～0.55 times of tornadotron outer cylinder body interior diameter, the following open area of lower cone be upper cone following open area 30%～55%, when guide vane inner edge angle of outlet β 1 is 15 °～26 °, outer rim angle of outlet β 2 is 13 °～30 °, the core tubular construction adopts the reducing core barrel, when the reducing lower port diameter is 0.3～0.9 times of overall diameter of riser, the physical dimension of its bipyramid is: the lower port diameter of upper cone is 0.50～0.68 times of interior diameter of tornadotron outer cylinder body, the following open area of lower cone be upper cone following open area 40%～80%.

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