CN87208734U

CN87208734U - Wirlwind generator

Info

Publication number: CN87208734U
Application number: CN 87208734
Authority: CN
Inventors: 陈朝云
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-06-06
Filing date: 1987-06-06
Publication date: 1988-05-25

Abstract

The utility model discloses a whirlwind generator which is composed of an outer sleeve, an inner sleeve, an expansion pipe, etc. The outer sleeve is provided with a plurality of tangential rectangular wind input openings and vertical wind input holes. A rotary airflow forming chamber is arranged between the outer sleeve and the inner sleeve. The inner sleeve is provided with vertical wind output holes. The device of the utility model can be used in various metallurgical furnaces which need wind supply. The whirlwind generator is particularly used in a cupola furnace circular wind box. The whirlwind generator outputs whirlwind which comprises mutually fitting rotary airflow and axial airflow. The whirlwind enters the metallurgical furnace, and the airflow of the whirlwind can be uniformly distributed. The effect of the furnace wall of the metallurgical furnace can be relieved. The consumption and loss of chemistry heat energy of burning bottom coke is reduced. The heating intensity of the bottom coke in unit time is enhanced. The whirlwind generator achieves the purpose of increasing production and saving.

Description

Wirlwind generator

The present invention's " whirlwind generating means " can be applicable on the various metallurgical type of furnaces that need air feed, particularly assembles and is applied on the air inlet of furnace cupola side-blown ring-type bellows.

The present invention's " whirlwind generating means " belongs to hydrodynamics and a kind of new ground-breaking application of aerodynamics on the cupola melting air supply method.

According to retrieval and convection cell mechanics, the technical equipment of aerodynamics aspect and the understanding of apparatus learn that the present invention is unprecedented; High speed whirlwind bundle also of no use be furnace cupola and other metallurgical furnace type in melting as air supply method.

Existing at present " cyclone dust collectors " " pneumatic wrench " etc. just are used as power with air-flow, and air-flow is done the garden ring along garden bucket inwall and moved, and do not have the air-flow of axial force, after the function of air-flow is finished, are discharged by the center as the waste gas of depleted of energy.

Widely used at present " furnace cupola " is the side-blown air feed.Its air supply method is to offer some air inlets at the inwall of ring-type bellows to realize.The air-flow of its air intake is rectilinear, is limit by its characteristic, and natural birth is given birth to and stated the melting defective.

1. air feed skewness, " furnace wall effect " is serious.Stock column in " furnace cupola ", the place is comparatively sparse in the furnace wall, and the space is more; Comparatively intensive at Lu Xinchu, the space is less.Therefore place, furnace wall air enrichment, Lu Xinchu is thin, and is subjected to the resistance of bed coke and the pressure of furnace charge behind the side-blown air-flow air outlet, the air-flow that major part is obstructed will with the flame of bed coke generation combustion reaction to its in the other direction or tiltedly the rear to the furnace wall impact.Cause the furnace wall scaling loss very fast, promptly " furnace wall effect " is serious.

2. blow the reshahar mouth, loss heat energy.Because air quantity skewness.The excessive air quantity in place, air port, the phenomenon that causes the air port slagging scorification often and blow black coke.Therefore wind supply quantity and wind speed greatly reduce thereupon, and then the problem of Lu Xin district air feed deficiency further worsens.Facilitate CO ₂The reduction endothermic reaction of+C → 2CO-3237 kilocalorie/kilogram charcoal and because anoxic formation C+ 1/2 O ₂The generation of the imperfect combustion of → CO+2450 kilocalorie/kilogram charcoal reaction causes bed coke heat energy to consume widely and runs off.

3. the bed coke diffusion velocity is slow, and overheavy firing is poor.Temperature in " furnace cupola " is decided by the burning velocity of bed coke, and the burning velocity of bed coke is decided by the reaction speed and the diffusion velocity of coke.When temperature is lower than 800 ℃, the burning velocity of bed coke depends on the reaction speed of coke, the burning velocity of bed coke depends on the diffusion velocity of coke when temperature is higher than 800 ℃, the temperature of the interior bed coke of furnace cupola is higher than 800 ℃ during melting, therefore the burning velocity of bed coke will reach the purpose of overheavy firing, must improve the diffusion velocity of coke.

Bed coke is in combustion process, and its surface will be by lime-ash and CO ₂, reactants such as CO gas are formed separation layer.This separation layer greatly hampers the diffusion velocity of barrier bed coke.

The cross air blasting air-flow can only play impact and press attached effect this separation layer.In case the air quantity wind speed is excessive, also can make the bed coke blast-cold lime-ash in the bed coke surface solidification, cause reaction to stop.

The present invention's " whirlwind generating means " is applied to the furnace cupola air feed, is a kind of mechanical part that straddles on the bellows inside and outside wall.With the distinctive performance of the whirlwind of its generation, keep it to fly forward the easier bullet that resembles rotation and run through the inertia of object.

The air flow stream that is produced by the present invention's " whirlwind generating means ", by the center at a high speed the linear air flow stream and make the common whirlwind bundle of forming of high speed rotary motion air flow stream on every side.The powerful whirlwind beam of this burst is gone in the furnace cupola, and air-flow can go deep into the stove heart along irregular surface of bed coke and space, improves the even distribution of tuyere area and even whole Lu Xin district air quantity, thereby has alleviated " furnace wall effect "; Avoid tuyere area to cause the air port slagging scorification because of air quantity is excessive and blown black matrix Jiao's phenomenon; Reduced the Lu Xin district and caused CO because of deficiency in draught ₂The reduction endothermic reaction of+C → 2CO-3237 kilocalorie/kilogram charcoal and because anoxic formation C+ 1/2 O ₂The imperfect combustion reaction of → CO+2450 kilocalorie/kilogram charcoal.

The whirlwind bundle that is produced by the present invention's " whirlwind generating means " enters in the furnace cupola, and to have the powerful centrifugal force and the characteristic of axial force after its outlet, its surface produces in the time of bed coke can being burnt by lime-ash and CO ₂, the separation layer of CO gas composition promptly is stripped from and is cast aside.Make the bed coke surface continuously expose new active layer, accelerated the diffusion velocity on bed coke surface, improved the burning velocity of bed coke, reached the purpose of overheavy firing.Bed coke is significantly improved at the heating strength of unit interval internal combustion.Thereby the burn-off rate of furnace cupola and molten iron temperature are significantly improved.Realize low consumption, efficient, high-quality, energy-conservation technical economic benefit.

Fig. 1 is the complete section front view; Fig. 2 is a rectangle air inlet profile; Fig. 3 is straight wind air inlet profile.

The present invention's " cyclone generator " structure is such as figure: 1. overcoat; 2. inner sleeve; 3. increaser; 4. end cap; 5. plate washer; 6. handle; 7. peep hole; 8. straight wind fresh air inlet; 9. straight wind exhaust vent; 10. rectangle air inlet; 11. bellows inwall; 12. the compositions such as bellows outer wall, and form following four structural sections:

A, air intake garden shell of column. Formed by the Cylinder position of overcoat and the inside and outside Cylinder position of inner sleeve. Architectural feature is:

1. put the rectangle air inlet that is provided with several convergents outward. Wherein two relative wall planes are tangential on the inwall garden cylinder of overcoat by same direction respectively and cross this point of contact and are tangential on an imaginary garden cylinder than the outer garden of inner sleeve cylinder slightly larger in diameter 1 millimeter; And two other wall planes are parallel to each other, and form the angle α that leans forward with the inner-outer sleeve axial line.

The effect of tangential rectangle air inlet is to make the high pressure draught in the bellows introduce garden band of column shape cavity by tangential direction, and is rectified into the swirling eddy bundle.

2. the point of attachment at interior overcoat is provided with several straight wind fresh air inlets entad and that intersect at axial line.

The effect of straight wind fresh air inlet is the internal cavity of cover in the high pressure draught in the bellows is introduced, for the direction of axis line air-supply is prepared.

B, rectification garden awl section.By the inner conical surface (taper angle β) of overcoat, the interior male cone (strobilus masculinus) of interior cover and fairing outer surface are formed.Form garden conical ring cavity between interior overcoat, garden awl cavity is at interior cover inner chamber formation garden awl cavity.

The effect of this section is the annular flow bundle with A section rotation, quickens rotation gradually, after crossing fairing, in be formed centrally passage with certain vacuum degree.This passage is the A section is played acceleration by the linear air flow stream of straight wind exhaust vent ejaculation effect; This strand linear air flow stream simultaneously attracts the air flow stream that rotatablely moves again with its high-speed motion, leaves the tube wall certain clearance, reduces friction, quickens rotation and travels forward.These two bursts of air flow stream are mended mutually and are coordinated, and are combined to form the whirlwind bundle that rotates and have powerful axial velocity at a high speed in same Communicating device.

C, trunnion section are the post holes, garden that connects with the inner conical surface of overcoat.It is comparatively suitable in diameter that the length in this hole is answered about 3 times.

The effect of this section is to the further rectification supercharging of the whirlwind bundle of B section.

D, flaring pipeline section.Joining with trunnion, is flaring shape (taper angle γ), and the exit has one section garden cylindrical hole and furnace cupola inwall to join.

The effect of this section is with the whirlwind bundle decompression of trunnion section, quickens to draw, and injects burner hearth.Generally make by refractory material or refractory metal material.

The feature of its each region of interest of the present invention's " whirlwind generating means " is:

1. the long-pending summation in some rectangle air inlets effective cross section should be long-pending greater than garden band of column shape cavity cross section; Several straight wind fresh air inlet cross-sectional area summations should be greater than straight wind exhaust vent cross-sectional area.Its effect is to guarantee to have sufficient air quantity to enter air intake garden shell of column.

2. straight wind exhaust vent cross-sectional area should be the cross-sectional area of the garden post cavity with certain vacuum degree that is formed centrally in the trunnion position.Its effect is that assurance swirling eddy bundle and linear air flow stream are not mixed.

3. the effective cross section at garden band of column shape cavity place, fairing peak place, trunnion place is long-pending should be convergent successively; Interior cover inner cone convergent direction is consistent with airflow direction.Its effect all is to quicken for air-flow is pressurizeed.

4. relevant angle character is: ∠ α＞∠ β＞∠ γ.Its effect is the resistance that can reduce air-flow, increases the air-flow jet velocity.

5. the shape of relevant fairing is: minor axis should equal throat pipe diameter; Major axis should equal 1.5～2 times of throat pipe diameter.Its effect is to make the swirling eddy at trunnion maximum radius place can reach maximum line velocity.

Claims

1, whirlwind generating means of the present invention can be applicable on the various metallurgical type of furnaces that need air feed, when particularly being applied in foundry cupola side-blown air feed, be a kind of mechanical part that straddles on the bellows inside and outside wall, it is characterized in that the overcoat by coaxial line, interior cover and increaser are formed; Put inside and outside fresh air inlet (mouth) is located at, extend into the furnace cupola inwall by trunnion and increaser;

Its global feature is by axially being divided into four structural sections:

A, air intake garden shell of column: be made up of the Cylinder position of overcoat and the inside and outside Cylinder position of interior cover, architectural feature is:

Put the rectangle air inlet that is provided with several convergents outward, two relative wall plane is tangential on outer casing inner wall garden cylinder by same direction respectively and crosses this point of contact and is tangential on an imaginary garden cylinder than the outer garden of interior cover cylinder slightly larger in diameter 1 millimeter; And two other wall planes are parallel to each other, and form the angle＜a that leans forward with inside and outside cover axle center line, and are provided with several straight wind fresh air inlets entad and that intersect at axial line at the point of attachment of interior overcoat;

B, rectification garden awl section: by the inner conical surface of overcoat, the interior male cone (strobilus masculinus) of interior cover and fairing outer surface are formed, and its shape facility is: the garden conical ring cavity and the cone cavity that form convergent;

C, trunnion section: be the post hole, garden that connects with the inner conical surface of overcoat;

D, divergent segment: to inboard wall of burner hearth, its material characteristics is by trunnion: made by refractory material or refractory metal material;

2, according to the described whirlwind generating means of claim 1., its each region of interest cross-sectional area feature is:

A, several rectangle air inlet effective cross section area summations should be greater than garden band of column shape cavity cross section area; Several straight wind fresh air inlet cross-sectional area summations should be greater than straight wind exhaust vent cross-sectional area;

B, straight wind exhaust vent cross-sectional area should be the cross-sectional areas of the garden post cavity with certain vacuum degree of trunnion position axial centre formation;

C, band of column shape cavity place, garden, fairing peak place, the effective cross section area at trunnion place should be a convergent successively;

3, according to claim 1. or 2. described whirlwind generating means, it is characterized in that: ∠ α＞∠ β＞∠ γ;

4, according to claim 1. or 2. described whirlwind generating means, it is characterized in that: the minor axis of fairing should be equivalent to throat pipe diameter; Major axis should be equivalent to 1.5～2 times of throat pipe diameter.