CN1023609C

CN1023609C - Tornado generator and its effect field smelting method

Info

Publication number: CN1023609C
Application number: CN 91102423
Authority: CN
Inventors: 陈朝云
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-04-20
Filing date: 1991-04-20
Publication date: 1994-01-26
Anticipated expiration: 2006-04-20
Also published as: CN1066086A

Abstract

The present invention relates to a tornado generator and a smelting method of an effect field thereof. The tornado generator is installed on the furnace wall of a metallurgical furnace by a certain method. The tornado generator is composed of a spiral casing, an outer sleeve, an inner sleeve, an outer cone, an inner cone, a spiral flow guiding body, etc. The straight-line air flows passing through the tornado generator are converted to tornados, and a plurality of tornados form a tornado effect field in a hearth. The tornado generator has the advantages of reinforcement of the stripping, impacting and penetrating performance of the air flows and the combustion strength of bed coke, enhancement of the temperature of molten iron and reduction of furnace wall effect and heat energy consumption, avoids the air flows of observation holes from outwards rushing and achieves the economic technical effects of energy saving, high quality, high efficiency, safety, etc. in smelting production.

Description

Tornado generator and its effect field smelting method

The present invention is a kind of wind spout field-effect air supply method that needs the equipment of pressure air feed and use this equipment to produce during metallurgical melting is produced.

Patent documentation by retrieval, a kind of air supply method that improves smelting efficiency of introducing in C21 B7/16SU 1018973 files is to increase wind-force by the air-flow that furnace bottom forms spiral motion, obtains.This device is the method by the air port setting angle, makes the through zone of oxidation of air-flow of ejection.The shortcoming of this device is that the air-flow of each air outlet ejection all is the air flow stream that straight line is blown into, before also failing to be combined into swirling eddy, just slowed down and be subjected to the obstruct of coke, can not form swirling eddy on demand in stove, it has been turbulent state that considerable air-flow is just arranged.Therefore, can not form wind spout field-effect of the present invention on the whole with the overheavy firing effect.

Be that the air outlet in air port is into two splay conduits in its constructional feature of a kind of blast-furnace tuyere described in the file of C21 B7/16 SD975804 5800050 again, the medullary ray and the passage in its air port are angled.The wind that this air port is sent into can improve with slag contacting kind situation, improves thermo-efficiency, if on one side the splayed conduit lost efficacy, the other side continues air feed is convenient to maintenance.Its weak point is that the air feed air-flow in burner hearth can not form whole wind spout field-effect with the overheavy firing effect equally.

In 87208734.4 files of my application " the whirlwind generating unit " that propose, its primary structure is by interior cover, overcoat again; Put tangent air inlet outward, air-flow can form swirling eddy at the ring cavity between the interior overcoat, and interior cover center is provided with straight wind intake opening, sends into the linear pattern air-flow; Two strands of air-flows are injected in the stove by nozzle simultaneously.Because per share air-flow is over against the stove heart, so can not form the whirlwind field-effect.Because structural defective, the air-flow that enters can not tangentially import in advance in addition, and central gas stream is faintly can not rotate again, has reduced permeate gas stream, impacts, and stripping performance can not be adjusted the air quantity and the blast of air feed at random.

In order to overcome the defective of original technology, the objective of the invention is for metallurgical furnace particularly foundry cupola the ventilation apparatus of a kind of " cyclone generator " and " wind spout field-effect air supply method " are provided.

Design philosophy of the present invention is to make straight-line air-flow be transformed into the air-flow that rotatablely moves.Promptly on the cross section of ventilator trunk, make air-flow form orderly rotatablely moving.Its characteristics: radius general goal circular frequency is little, and pressure is big; The little place of radius circular frequency is big, and pressure is little; Simultaneously tend to the center, axial velocity is big more, thereby forms the air flow stream-artificial spout entad of one rotation.

Technical measures of the present invention:

The feature of cyclone generator is to establish in the spiral case (4) of spoiler (14) in overcoat (5) off-centre is installed in, and has blast inlet to connect airduct (3) on the spiral case, and airduct is connected bellows (15), and the rear end of spiral case connects with end cap seat (2); Be provided with several (rows) tangential blast inlet that leans forward (12) at the heavy wall upper edge of overcoat (5) circumference, ring cavity between feeding overcoat (5) and the interior cover (6) and the conical ring shape cavity between external conical sleeve (9) and the inner conical drogue (8); Front end at overcoat (5) is installed with external conical sleeve (9) and conical nozzle (10); At the center of interior cover (6) vision slit (13) is arranged, spiral stream guidance body (7) and inner conical drogue (8) are installed at its front end; By the thread connection of interior cover (6), can move forward and backward the spiral stream guidance body (7) and the inner conical drogue (8) of interior cover (6) and front end thereof with end cap seat (2).

The feature of wind spout field-effect air supply method is that cyclone generator is installed on the blast inlet of outer wall (11), make the tangential same imaginary garden of its axial line horizontal direction, and certain angle that has a down dip stretches in the furnace wall.The tangent line that producer axial line and imaginary garden are tangent and to cutting angle＜α choosing value in 0-45 ° that the medullary ray of the stove heart forms, angle of declination＜β is the choosing value in 0-20 °.Several cyclone generators of every row are all injected in the stove with identical cutting angle, and are combined into wind spout field-effect air supply method.

The mechanism and the advantage of the operational process of cyclone generator and field-effect air supply method thereof are as follows:

Air-flow is by bellows supercharging in airduct enters volute chamber, again through outside the tangent air inlet that puts, make ring cavity between the interior overcoat of air-flow and the conical ring shape cavity between the interior external conical sleeve quicken rotation and advance.And form certain center vacuum degree forwardly; Another part air-flow is further strengthened rotation through the internal surface of the spiral slot of spiral stream guidance body and inner conical drogue and is advanced, and has strengthened axial velocity under the effect of vacuum tightness forwardly.At this moment two bursts of flow groups are synthetic has powerful running through, impact and the artificial spout of stripping performance with the burning of reinforcement bed coke.And in vision slit, form certain negative pressure, avoided the air-flow phenomenon of outwash backward.Because interior cover and end cap seat thread connection can move forward and backward spiral stream guidance body and inner conical drogue that interior cover and front end thereof are installed, therefore can adjust the air quantity and the blast of air feed at random.Some strands of wind spout all cuts angle and angle of declination is injected in the stove with identical, is combined into wind spout field-effect air supply method, makes air-flow do rotatablely moving to a certain degree in burner hearth.Therefore reduced the dead angle between adjacent two air ports and the dead band of the stove heart, made the comprehensive overheavy firing of bed coke.The hot gas flow that slightly rotates has simultaneously reduced the speed that rises, the heat-exchange capacity between the molten iron that has increased hot gas flow and whereabouts drips.

Accompanying drawing of the present invention is as follows:

Fig. 1 is the cyclone generator structural representation;

Fig. 2 is the drawing in side sectional elevation of Fig. 1;

Fig. 3 is the part sectioned view of Fig. 1;

Fig. 4 is the synoptic diagram of wind spout field-effect air supply method;

Fig. 5 is the drawing in side sectional elevation of Fig. 4.

1, end cap; 2, end cap seat; 3, airduct; 4, spiral case; 5, overcoat; 6, interior cover; 7, spiral stream guidance body; 8, inner conical drogue; 9, external conical sleeve; 10, conical nozzle; 11, furnace outer wall; 12, tangent air inlet; 13, vision slit; 14, spoiler; 15, bellows; 16, wind spout field-effect.

Accompanying drawings of the present invention is as follows:

The high pressure draft of sending here from bellows (15), through airduct (3), enter the tangent air inlet (12) of shell (5) again through spiral case (4), in the conical ring shape cavity of the ring cavity of overcoat (5) and interior cover (6) and external conical sleeve (9) and inner conical drogue (8), quicken to rotate and advance, and form certain center vacuum degree forwardly; Spiral slot and the internal surface of inner conical drogue (8) of another part air-flow on spiral stream guidance body (7) further strengthened rotation and advanced, and increased axial velocity under the effect of vacuum tightness forwardly.At this moment two strands of flow groups synthesis of artificial wind spouts are injected in the stove through the conical nozzle (10) in the place ahead.Some strands of wind spout all cuts angle and angle of declination is injected in the stove with identical, is combined into wind spout field-effect 16.

The invention has the advantages that and strengthened running through of air-flow, impact and stripping performance, the air-flow in the burner hearth that distributed equably, strengthen the burning of bed coke, improved the molten iron temperature, improved melting rate, reduced " furnace wall effect ", reduced chemical heat and physical thermal loss, reduced burning loss of alloy; Reduced a layer coke-iron-rate, air-flow outwash phenomenon when having avoided the observation air port, reached melting produce in high-quality, the mixed economy technique effect such as energy-conservation, efficient, safe.

Claims

1, a kind of cyclone generator, it is characterized in that overcoat (5) off-centre establishes in the spiral case (4) of spoiler (14) in being installed in, there is blast inlet to connect airduct (3) on the spiral case, airduct is connected bellows (15), the spiral case rear end connects with end cap seat (2), be provided with several (rows) tangential blast inlet that leans forward (12) at the heavy wall upper edge of overcoat (5) circumference, feed the external conical sleeve (9) of the ring cavity between overcoat (5) and the interior cover (6) and the conical ring shape cavity between the inner conical drogue (8), front end at overcoat (5) is installed with external conical sleeve (9) conical nozzle (10), at the center of interior cover (6) vision slit (13) is arranged, at its front end spiral stream guidance body (7) and inner conical drogue (8) are installed, in cover (6) and end cap seat (2) thread connection, can move forward and backward the spiral stream guidance body (7) and the inner conical drogue (8) of interior cover (6) and front end thereof;

2, a kind of wind spout field-effect air supply method, its feature is installed in several (row) cyclone generators on furnace outer wall (11) blast inlet, make the tangential same imaginary garden of its axial line horizontal direction, and certain angle that has a down dip stretches in the furnace wall, with the tangent tangent line in imaginary garden with to cutting angle＜α choosing value in 0-45 ° that the medullary ray of the stove heart forms, angle of declination＜β is the choosing value in 0-20 °;

3, wind spout field-effect air supply method according to claim 2 is characterized in that, can move forward and backward the spiral stream guidance body (7) and the inner conical drogue (8) of interior cover (6) and front end thereof, and the cross-sectional area that changes conical ring shape cavity is to adjust the air quantity and the blast of air feed.