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

Abstract

The utility model relates to a vane-type cyclone pipe with a double-cone dust discharge structure, which is an improvement on a cyclone separator. It consists of guide vanes, air riser, core pipe structure, outer cylinder and double cone dust discharge structure. The double-cone dust discharge structure is composed of two cones superimposed, installed at the lower end of the cyclone pipe, the small end of the upper cone is installed into the large end of the lower cone, and there is a symmetrical opening on the wall near the large end of the lower cone. dust vent. The apex angles of the upper and lower cones of the double-cone dust removal structure are both 20° to 45°, the bottom area of the lower cone is 1.5 to 3.5 times the area of the lower mouth of the upper cone, and the length of the cone is the diameter of the bottom of the cone. The total area of the symmetrical dust discharge holes on the wall of the lower cone is 2.5% to 8.0% of the area of the lower opening of the lower cone. Other dimensions must be optimally matched with the size of the guide vane and the structure of the core tube.

Description

The utility model relates to a guide vane type cyclone pipe used in a vertical pipe type multi-pipe cyclone separator for separating solid particles from dust-containing gas.

The commonly used guide vane cyclone tube is composed of orthogonal guide vanes, air riser, outer cylinder and discharge pan. The common problem of this kind of guide vane cyclone pipe is that due to the various secondary vortexes inside and the return air of the ash hopper, it is easy to entrain and mix the fine dust and escape from the air riser. The fine dust (below 10 μm) is The separation efficiency is not high. At the same time, in the multi-tube cyclone separator composed of many cyclone tubes, due to the shared inlet and exhaust chambers and ash buckets, channeling and back-mixing will occur between the cyclone tubes, making the above-mentioned fine dust back-mixing The problem of escape from the chimney is more acute.

In order to solve the above problems and improve the efficiency of the cyclone tube for separating fine particles, a lot of research work has been carried out at home and abroad. For example, British Patent No. 1411136 (1972) proposed to remove the discharge pan at the lower end of the straight-pipe cyclone pipe to form a swirling flow barrier at the dust discharge port to prevent fine dust from being mixed in and solve the problem of dust discharge blockage. Japanese patent No. 56-40636 (1978) and No. 56-48219 (1978) show that a central dust-discharging bottom plate with an inverted cone is installed at the dust-discharging outlet at the lower end of the straight-pipe cyclone tube. The inverted cone is provided with dust-discharging holes and The return air hole can reduce the return mixing of fine dust, and at the same time change the dusty air inlet into multiple tangential inlets. The Chinese invention patent No. 86100974.6 is mainly to install a "splitting core tube" at the exhaust inlet of the cyclone tube, which can effectively improve the efficiency. At the same time, there is a Chinese utility model patent application (93216798.5), which is mainly to add an "anti-return mixing cone" at the dust outlet of the general tangential inlet cyclone separator, which can effectively reduce the return air entrainment of the ash hopper. dust problem.

The purpose of the utility model is to provide a novel high-efficiency vane-guided cyclone tube with a double-cone dust discharge structure.

The purpose of this utility model is achieved in this way: a uniquely designed double-cone dust discharge structure is installed at the lower end of the straight-pipe guide vane type cyclone pipe, and the small mouth end of the upper cone is loaded into the large mouth end of the lower cone, which is superimposed. , the size of the double-cone dust discharge structure must be optimally matched with the size of the guide vane and the structure of the core tube. ① When the outlet angle β1 of the inner edge of the guide vane is 18°～26°, the outlet angle β2 of the outer edge is 20°～30°, and the core tube structure adopts the split type core tube, the structural size of the double cone is: the upper cone The diameter of the lower opening is 0.40 to 0.55 times the inner diameter of the outer cylinder of the cyclone tube, and the area of the lower opening of the lower cone is 30% to 55% of that of the upper cone; ② When the outlet angle β1 of the inner edge of the guide vane is 15° ～26°, the outlet angle β2 of the outer edge is 13°～30°, the core tube structure adopts the necked core tube, and when the diameter of the lower mouth of the necked mouth is 0.3 to 0.9 times the outer diameter of the air pipe, the lower mouth of the upper cone The diameter is 0.50-0.68 times the inner diameter of the outer cylinder of the cyclone tube, and the area of the lower opening of the lower cone is 40%-80% of that of the upper cone. The apex angles of the upper and lower cones are both 20° to 45°, the bottom area of the lower cone is 1.5 to 3.5 times the area of the lower mouth of the upper cone, and the length of the cone is 0.8 to 1.5 times the diameter of the bottom of the cone. The bottom of the lower cone is provided with symmetrical dust discharge holes (which can be slits or round holes), the total area of which is 2.5% to 8.0% of the area of the lower mouth of the lower cone. The key to optimal matching of the guide vane, the core pipe and the double-cone dust discharge structure is to make the pressure drop of the ash hopper of the cyclone pipe 55% to 85% of the total pressure drop.

Accompanying drawing 1 is according to the structure schematic diagram of the guide vane type cyclone pipe with double-cone dust discharge structure proposed according to the utility model;

Accompanying drawing 2 is the schematic diagram of the double-cone dust discharge structure proposed according to the utility model.

In the figure, 1-air riser, 2-guide vane, 3-outer cylinder, 4-core tube structure, 5-upper cone, 6-ash hopper, 7-lower cone, 8-core tube cone, 9 - the lower opening of the core tube, 10 - the upper cone, 11 - the annular top plate, 12 - the dust discharge hole, 13 - the lower opening of the upper cone, 14 - the lower cone, and 15 - the lower opening of the lower cone.

The dust-laden gas enters the cyclone tube body 3 axially and then tangentially from the guide vane 2, and the dust in it is thrown to the cyclone tube body 8 and the upper cone 10 under the centrifugal force generated by the high-speed rotating air flow. On the inner wall, the dust flows downward under the action of gravity, enters the lower cone 7 through the lower opening 13 of the upper cone, and enters the ash hopper 6 through the lower opening 15 of the lower cone. Part of the dust concentrated on the annular top plate 11 of the lower cone 7 can be discharged into the ash hopper 6 through the dust discharge hole 12 . Due to the "shielding" effect of the swirling air flow at the lower opening 15 of the lower cone, the back-mixing effect caused by the fine dust in the ash hopper 6 being entrained by the return air can be effectively reduced, and at the same time due to the difference in the size of the upper and lower cone dust discharge Gradual reduction can also reduce the amount of air entering the ash hopper, and can also effectively reduce the problem of fine dust entrained in the mixed air from the ash hopper, so the efficiency can be effectively improved.

In order to better demonstrate the advantages of the vane-type cyclone tube with double-cone dust discharge structure of the present invention, the following examples are used to illustrate.

Example 1, a cyclone tube with a diameter of 250mm is used, the guide vanes are of orthogonal hybrid type, the outlet angle β1 of the inner alignment is 25°, the outlet angle β2 of the outer alignment is 30°, and the core tube adopts a shunt type core tube. According to the requirements of the utility model, the optimal size of the double-cone dust discharge structure adopted in the design should be: the apex angle of the upper cone is 30°, and the lower opening diameter of the upper cone is 125mm; the bottom diameter of the lower cone is 200mm, the diameter of the lower opening of the lower cone is 85mm, and the apex angle of the lower cone is 32°; the size of the dust discharge hole on the lower cone is φ6 (mm)×4×2. 325 mesh talcum powder is used for cold test, the inlet concentration is 1g/m ³ , the inlet gas volume is 2200m ³ /h, the ash hopper deflation is 2%, the separation efficiency can reach 96.23%, and the total pressure drop is about 15KPa. Comparative example 1, using the cyclone tube with the guide vane and core tube structure as described in Implementation 1, without installing the double-cone dust discharge structure, and conducting the cold test with 325 mesh talc powder, the inlet concentration is 1g/m ³ , and the inlet gas volume is 2200m ³ /h, the ash hopper is 2% deflated, the separation efficiency is 93.3%, and the total pressure drop is about 15KPa.

Embodiment 2, using a cyclone tube with a diameter of 250mm, the guide vanes are forward secant type, the inner edge outlet angle β1 is 25°, the outer edge line outlet angle β2 is 30°, the core tube is a necking type, and its lower opening The diameter is 125mm. According to the requirements of the present invention, the optimal size of the double-cone dust discharge structure used in the design is: the apex angle of the upper cone is 26°, the diameter of the lower opening of the upper cone is 162mm; the bottom diameter of the lower cone is 220mm, and the diameter of the lower cone The diameter of the lower mouth of the body is 96mm, the apex angle of the lower cone is 33°, and the size of the dust discharge hole on the lower cone is φ6 (mm)×5×2. 325 mesh talcum powder was used for cold test, the inlet concentration was 1g/m ³ , the inlet air volume was 2180m ³ /h, the ash hopper deflation was 2%, the separation efficiency was 94.47%, and the total pressure drop was about 13KPa. Comparative example 2, adopt the cyclone tube of guide vane and core pipe structure as described in embodiment 2, do not install double cone dust discharge structure, carry out cold state test with 325 order talcum powder, operating condition is with embodiment 2 described, its The separation efficiency is 90.34%, and the total pressure drop is about 13KPa.

This kind of cyclone tube with double-cone dust removal structure can be used in the dust removal, purification and solid particle recovery of high-temperature dusty gas in petrochemical plants, and can also be used in coal-fired power generation and coal gasification. , plastics, chemicals, cement, light industry and other industrial sectors.

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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