CN201320532Y

CN201320532Y - Dynamic rotary separator

Info

Publication number: CN201320532Y
Application number: CNU2008201240680U
Authority: CN
Inventors: 黄锏; 胡滨; 王振泽; 银洋
Original assignee: BEIJING BOXIGE DYNAMIC TECHNOLOGY Co Ltd
Current assignee: BEIJING BOXIGE DYNAMIC TECHNOLOGY Co Ltd
Priority date: 2008-12-02
Filing date: 2008-12-02
Publication date: 2009-10-07
Anticipated expiration: 2018-12-02

Abstract

The utility model discloses a dynamic rotary separator, which comprises a separator housing, a moving blade device and a stationary blade device of the rotary separator, a variable frequency motor, a driving wheel and a driven wheel of a gear driving device, a bearing support, a rotating disc bearing and the like; the variable frequency motor is connected with the driving gear through a shaft coupling; the driving gear is mounted in an oil bath of the housing at the outer part of the separator through a pair of bearings positioned at the upper part and the lower part of the driving gear; the driving gear (4) is meshed with the driven gear (6) through a gear surface; the driven gear is mounted on a hollow shaft through the rotating disc bearing and drives the hollow shaft to rotate when the driven gear rotates, thereby driving the moving blade (12) connected with a rotor hollow shaft to drive; the rotor hollow shaft (9) is positioned inside a box cover (8); the stationary blade (13) is fixed on an upper plane of the housing (14) at the lower part of the separator through a bolt; and the moving blade (12) and the stationary blade (13) are in the same plane. The utility model can solve the technical problems of adjustable coal fineness, higher efficiency, and the efficient burning of the high-capacity thermal power generating unit and low NOx emission requirements.

Description

Dynamic rotary separator

Technical field

The utility model relates to the separator of medium-speed pulverizer.

Background technology

Medium-speed pulverizer comprises various ways such as MPS, HP, RP, and wherein separator all adopts the static separation device, mainly comprises blade control device, stator blade, shell separator, separator top cover, separator distilling apparatus, returns parts such as powder awl and retaining white butterfly plate.Return powder awl microcephaly and be supported on downward vertically and separate body inside, the blade control device of being made up of connecting rod, control stick etc. is installed in the top of static separation device top cover.Because traditional coal pulverizer separator all adopts the structural limitations of the static blade that is arranged in the coal pulverizer outlet, so can only come the control channel area by the aperture that adjustment is folded to blade, change fineness of pulverized coal, a large amount of qualified coal dusts are ground in coal pulverizer repeatedly, increase interior circulating load, reduced separative efficiency.Rely on the inertia force of coal dust to carry out the thickness separation simultaneously, separative efficiency is low, and fineness and uniformity are difficult to satisfy the requirement of boiler combustion high-efficiency environment friendly.

Summary of the invention

The purpose of this utility model provides a kind of dynamic rotary separator, and is adjustable with the fineness of pulverized coal that solves medium-speed pulverizer, efficient is higher, adapt to technical problems such as big capacity fired power generating unit efficient burning and low NOx drainage demand.

The technical scheme that dynamic rotary separator described in the utility model is realized above-mentioned purpose is as follows:

The utility model dynamic separator comprises: shell separator, the driving wheel of the dynamic and static blading of rotary separator, variable-frequency motor, VFC cabinet, gear drive and driven pulley, bearing block and turntable bearing; Variable-frequency motor links to each other with driving gear by shaft coupling, driving gear is by being arranged in the oil sump that its upper and lower pair of bearings is installed in the separator external shell, driving gear 4 and driven gear 6 are meshed by the flank of tooth and are in the same place, driven gear is installed on the hollow shaft by turntable bearing, and drive hollow shaft when rotating and rotate, thereby the rotation of the moving vane 12 that drive and rotor hollow shaft connect together; Described rotor hollow shaft 9 is positioned at case lid 8 inside, and stator blade 13 is by on the last plane that is bolted to separator lower case 14, and moving vane 12 and stator blade 13 are at grade.

The utility model is compared with traditional static separation device, advantage applies in the following areas: 1, separative efficiency significantly improves, and consequently under the operating mode of exerting oneself equally, the interior circulating load of dynamic separator is little; 2, because coal pulverizer can reach maximum interior circulation again by increasing load, the maximum capacity that is to say coal pulverizer has improved, can be that higher coal dust is exerted oneself specifically, select littler Ha Shi grindability for use and improve fineness of pulverized coal, improve pulverized coal fineness; 3, dynamic separator has improved fineness of pulverized coal, has improved efficiency of combustion, has improved the boiler combustion situation; 4, the design of dynamic separator is applicable to when the grainding capacity of grinding low-volatile coal and coal pulverizer descends, and makes system can be in conventional state, finishes the adjustment of exerting oneself.

Concrete effect is described below:

A) aspect coal adaptability, be suitable for various bituminous coal, meager coal and various thermal coal, fineness of pulverized coal is adjustable, and scope is at R90=7%-40%.

B) improving aspect the efficiency of combustion, improving fineness of pulverized coal, reducing unburned carbon in flue dust, improving efficiency of combustion, the coal dust distributivity is more even, distributes deviation to be not more than 10%, and the coal dust that improves pulverized coal feed pipe distributes, and guarantees that the burner hearth burning is more reasonable; Improve coal particle size and distribute, meal still less, fineness is more even, the burning of low-NOx combustor preferably helps environmental protection

C) improving the coal pulverizer aspect of performance, improve separative efficiency, reduce the circulating ratio of coal dust in the mill, improve pulverizer capacity, exert oneself under the square one and improve more than 10%, under the equal conditions, reduce coal pulverizer pressure reduction.

D) aspect the operation adjustment, be equipped with frequency conversion equipment, can regulate coal dust by the adjustment of spinner velocity, online adjusting, easy to adjust flexible, change according to coal, carry out online adjustment.

Description of drawings

Fig. 1 is the structural representation of dynamic rotary separator of the present utility model.

Fig. 2 is the partial structurtes figure of the moving vane drive part of Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing dynamic rotary separator of the present utility model is further specified.

Dynamically the rotary separator structure in Fig. 1, comprises variable-frequency motor 1 as shown in Figure 1, shaft coupling 2, motor cabinet 3, driving gear 4, fuel outlet valve 5, driven gear 6, power transmission shaft 7, case lid 8, rotor hollow shaft 9, turntable bearing 10, separator top (powder delivery tower) 11, moving vane 12, stator blade 13, separator lower case 14 is returned critical pieces such as powder awl 15 and manhole 16.Variable-frequency motor 1 by shaft coupling 2 transmission of power to driving gear 4, these gear top and bottom are fixed by pair of bearings, driving gear 4 and driven gear 6 are meshed by the flank of tooth and are in the same place, thereby rotatablely moving of driving gear 4 be delivered to rotor hollow shaft 9 publish in instalments mutually on together the driven gear 6, thereby obtain the rotation of the moving vane 12 that connects together with the rotor hollow shaft.The partial structurtes of moving vane drive part are referring to shown in Figure 2.The direction of rotation of moving vane 12 is seen as downwards from coal pulverizer top and is rotated counterclockwise (also can clockwise rotate).Rotor hollow shaft 9 is positioned at case lid 8 inside, and rotor hollow shaft 9 tops connect together by bolt and driven gear 6, and its underpart also is to be linked at moving vane 12 by bolt, and stator blade 13 is by on the last plane that is bolted to separator lower case 14.Above-mentioned driving and driven travelling gear adopts heavy duty industrial gear oil N320.Turntable bearing adopts universal lithium base fat No. 2.Turntable bearing is sealed by sealing wind, prevents that foreign material from polluting.

The dynamic rotary separator of the utility model uses a turntable bearing 10, is positioned at the top of separation, and bearing has the oil sealing of protection bearing and the sealing wind labyrinth that prevents dust pollution.The MPS coal pulverizer situation of using dynamic rotary separator of the present utility model as shown in Figure 2; coal dust at the vane place of mill bowl after preliminary separation; rotate rising with air-flow; enter separator region; contact with stator blade 13 in separator lower case 14 inside; pulverized coal flow and stator blade 13 bump; simultaneously under centrifugal force and gravity effect; pulverized coal flow is formed one-level separate, stator blade 13 has stoped passing through of larger particles, makes bulky grain fall back to mill bowl place; further grind; thinner pulverized coal flow comes in contact with the moving vane 12 that rotates by behind the stator blade 13, and the secondary centrifugation takes place; moving vane 12 further separates pulverized coal flow; make final satisfactory pulverized coal flow by moving vane, enter in the separator top (powder delivery tower), and finally discharge coal pulverizer.Separate the unsanctioned rough coal powder in back through secondary and pass through back powder awl 15, fall back on the mill bowl and grind once more.The VFC of reaching the same goal cabinet and variable-frequency motor can change the rotating speed of rotor (hollow shaft) 9, thereby change the rotating speed of moving vane 12, and then obtain the adjustable qualified coal dust of fineness.

Rotary separator of the present utility model mainly relies on rotating vane that coal dust is separated, except that the inertia force of coal dust, the main bump centrifugal action of coal dust and rotating vane that relies on carries out, the separative efficiency height, coal dust is thin, evenly act charitably, and grabbing of rotating vane exert and can frequency conversion adjust automatically, satisfy the requirement of efficient under the different operating modes of boiler, low NOx combustion pulverized coal preparation system.

Traditional MPS medium-speed pulverizer coal pulverizer major function is that diameter is ground to form coal dust boiler of feeding burning about 0.075mm smaller or equal to the raw coal of 38mm.Because traditional MPS medium-speed pulverizer is a known technology, so its structure chart omits herein.Being used for the dry and heat primary air of carrying coal dust in the coal pulverizer enters from the air inlet of the side body of mill lower part of bowl, and around grinding the vane device that the bowl hub is upward through the mill bowl edge, the vane device of rotation makes air-flow be evenly distributed on the edge of mill bowl, and has improved the speed of air-flow.Meanwhile, coal dust and air-flow have just mixed, and air-flow carries the coal dust impact and enters the separator district.Lighter particle is carried into the separator top cover by air-flow to be separated, and stator blade produces wind powder mixture to rotatablely move and causes heavy particle to lose momentum and fall from air-flow herein.

The heavier coal particle that separates out at the stator blade place turns back to the abrasive areas of mill bowl along the inwall that returns the powder awl.Return the powder awl heavy particulate coal is separated from the coal pulverizer regions of turbulent flow, the outer heavy particle of regions of turbulent flow is returning under the gravity effect on the mill bowl.Pass air-flow and fall into the external foreign material that are difficult for grinding in the side body area and be loaded screeding device on the mill bowl hub and scrape in the hole on the side organism soleplate, enter the stone coal collecting device then.

Claims

1, a kind of dynamic rotary separator, it is characterized in that this dynamic separator comprises: shell separator, the driving wheel of the dynamic and static blading of rotary separator, variable-frequency motor, VFC cabinet, gear drive and driven pulley, bearing block and turntable bearing; Variable-frequency motor links to each other with driving gear by shaft coupling, driving gear is by being arranged in the oil sump that its upper and lower pair of bearings is installed in the separator external shell, driving gear (4) and driven gear (6) are meshed together by the flank of tooth, driven gear is installed on the hollow shaft by turntable bearing, and drive hollow shaft when rotating and rotate, thereby the rotation of the moving vane (12) that drive and rotor hollow shaft connect together; Described rotor hollow shaft (9) is positioned at case lid (8) inside, and stator blade (13) is by on the last plane that is bolted to separator lower case (14), and moving vane (12) and stator blade (13) are at grade.