CN104121784A - Low-resistance trolley type scrap preheating furnace with movable gate plates - Google Patents
Low-resistance trolley type scrap preheating furnace with movable gate plates Download PDFInfo
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- CN104121784A CN104121784A CN201410398067.5A CN201410398067A CN104121784A CN 104121784 A CN104121784 A CN 104121784A CN 201410398067 A CN201410398067 A CN 201410398067A CN 104121784 A CN104121784 A CN 104121784A
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Abstract
The invention discloses a low-resistance trolley type scrap preheating furnace with movable gate plates. The low-resistance trolley type scrap preheating furnace comprises a furnace body. The furnace body is provided with a furnace chamber penetrating through the left end and the right end of the furnace body, the opening in the left end of the furnace chamber is provided with a discharge furnace door, and the opening in the right end of the furnace chamber is provided with a feeding furnace door. The low-resistance trolley type scrap preheating furnace with the movable gate plates is provided with trolleys used for being loaded with steel scraps. The furnace chamber is communicated with an intake flue and an exhaust flue. One or more movable gate plates are arranged in the furnace chamber and matched with the trolleys. The low-resistance trolley type scrap preheating furnace has the advantages of being good in preheating effect and low in equipment cost and greatly reducing dioxin generated in the scrap preheating process.
Description
Technical field
The present invention relates to steelmaking equipment technical field, especially relate to a kind of car-type scrap steel preheating stove with movable flashboard lower resistance.
Background technology
In the electric furnace steel making that the steel scrap of take is primary raw material, scrap steel preheating is the major measure that reduces power consumption and improve production capacity.At present with the supporting scrap steel preheating of electric furnace in, representative manner has shaft furnace mode and horizontal continuity transfer ways, device therefor is respectively such as being comb formula shaft furnace electric arc furnaces and Kang Sidi electric arc furnaces (being consteel electric arc furnaces).In comb formula shaft furnace, the hot flue gas of electric furnace enters from the lower end of vertical shaft, from the upper end of vertical shaft, discharges.Like this, the section of vertical shaft will have enough large, could allow hot flue gas in gap, flow through between steel scrap.In actual production, the finger of water-cooled is combed and easily by steel scrap, is smashed and leak, or is blocked by steel scrap, and the cost of equipment is high, and plant maintenance amount is large, so the only large stove use of some on electric furnace steel making of comb formula shaft furnace.The hot flue gas of Kang Sidi electric arc furnaces flows against steel scrap operation in preheating device, because steel scrap cannot be full of in the preheating device of level, there is the air-flow of most to flow on the top of steel scrap layer, make the scrap steel preheating weak effect of bottom, in order to reach higher heat exchange, conventionally need 60 meters of long preheating tunnels.Owing to thering is chloride compound in steel scrap, as PVC etc., in theory, these chloride compounds will produce dioxin lower than 800 ℃ of imperfect combustions, and within the scope of 300～500 ℃, imperfect combustion the most easily produces dioxin especially, because the preheating tunnel of Kang Sidi stove is longer, after hot flue gas and steel scrap heat exchange, temperature constantly reduces, and makes the chloride compound as easy as rolling off a log generation dioxin under imperfect combustion between 300～500 ℃ in steel scrap, contaminated environment.
Summary of the invention
The object of this invention is to provide a kind of car-type scrap steel preheating stove with movable flashboard lower resistance, it has the advantages that pre-heat effect is better, equipment cost is lower.Further, it also has the feature that can greatly be reduced in the generation of dioxin in scrap steel preheating process.
The technical solution adopted in the present invention is: the car-type scrap steel preheating stove of the movable flashboard lower resistance of band, comprise body of heater, this body of heater has the furnace chamber at the two ends, left and right that connect this body of heater, and the left end opening of this furnace chamber is provided with discharging door, right-end openings is provided with charging fire door, simultaneously, the car-type scrap steel preheating stove of the movable flashboard lower resistance of this band is furnished with for loading the chassis of steel scrap, and, this furnace chamber is communicated with air inlet flue and the flue of giving vent to anger, in described furnace chamber, be provided with at least 1 movable flashboard, this activity flashboard and this chassis match.
Described air inlet flue is communicated in a side of this furnace chamber by least 2 air inlets, and those air inlets are arranged from left to right, this flue of giving vent to anger is communicated in the opposite side of this furnace chamber by least 2 gas outlets, and arrange from left to right those gas outlets, simultaneously, those air inlets are adjacent between two with those gas outlets, and between adjacent air inlet and gas outlet, have at least 1 chassis.
The right part of described furnace chamber has an air inlet adjacent to this charging fire door.
Described air inlet is chewed alternative with burning.
The right-hand hydraulic cylinder that is provided with in outside of described body of heater.
The advantage that the present invention has is: 1, pre-heat effect is better, and equipment cost is lower.The car-type scrap steel preheating stove of the movable flashboard lower resistance of band of the present invention, by the introducing of some movable flashboards, makes hot smoke gas flow and steel scrap form forced convection heat transfer, has reached good pre-heat effect.Meanwhile, by hot smoke gas flow segmentation is entered in furnace chamber, heat respectively the steel scrap on different chassis, hot smoke gas flow is increased by the sectional area of steel scrap, reduced hot smoke gas flow mobile resistance in steel scrap, reached equally good pre-heat effect.And this equipment used unit is less, without larger volume, then cost lower, be easy to safeguard.2, the dioxin producing greatly reduces.The car-type scrap steel preheating stove of the movable flashboard lower resistance of band of the present invention is arranging movable flashboard and by by air inlet and gas outlet basis spaced apart, by the mode of air inlet is set at stove tail, make the temperature at this place higher, approximately be greater than 1000 ℃, make the part air of sneaking into directly light compound chloride in steel scrap, these chloride compounds are completed with regard to high-temp combustion when just entering preheating furnace, greatly reduced the discharge of dioxin.That is, with the high-temperature flue gas of part, sneak into the air of appropriate amount and lighted the chlorine-containing compound in the steel scrap that just enters preheating device, these chlorine-containing compounds are at high temperature burnt, reduced the discharge of dioxin.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is that the master of the car-type scrap steel preheating stove of the movable flashboard lower resistance of the band of embodiments of the invention looks cross-sectional schematic;
Fig. 2 is the schematic top plan view of the car-type scrap steel preheating stove of the movable flashboard lower resistance of the band of embodiments of the invention;
Fig. 3 is the section structure schematic diagram (amplifying with respect to Fig. 1) of the car-type scrap steel preheating stove of the movable flashboard lower resistance of the band of embodiments of the invention.
In figure: 10, body of heater, 11, furnace chamber, 12, discharging door, 13, charging fire door; 20, chassis; 31, air inlet flue, 311, air inlet, 32, the flue of giving vent to anger, 321, gas outlet; 40, movable flashboard; 50, hydraulic cylinder.
The specific embodiment
Embodiment, see shown in Fig. 1 to Fig. 3: the car-type scrap steel preheating stove of the movable flashboard lower resistance of band, comprise body of heater 10, this body of heater 10 has the furnace chamber 11 at the two ends, left and right that connect this body of heater 10, and the left end opening of this furnace chamber 11 is provided with discharging door 12, right-end openings is provided with charging fire door 13.This discharging door 12 and this charging fire door 13 can adopt lift also can adopt opposite opened.Meanwhile, the car-type scrap steel preheating stove of the movable flashboard lower resistance of this band is furnished with for loading the chassis 20 of steel scrap.That is, steel scrap is loaded on some chassis 20, and this chassis 20 is dextrosinistral by this furnace chamber 11.And this furnace chamber 11 is communicated with air inlet flue 31 and the flue 32 of giving vent to anger.In this air inlet flue 31, pass into hot flue gas.This hot flue gas can adopt waste heat, can be also that combustion gas burning is chewed or other fuel directly add thermogenetic hot flue gas.That is to say, steel scrap is loaded on every chassis 20, and those chassis 20 push in this furnace chamber 11 from stove tail successively, steel scrap process and hot flue gas on those chassis 20 carry out heat exchange, steel scrap is heated, heat complete steel scrap and release from burner, add in converter.
Further say, in this furnace chamber 11, be provided with at least 1 movable flashboard 40.Those movable flashboards 40 can move up and down.Such as, this activity flashboard 40 is by a steel wire hang, and this steel wire rope is connected with motor.Those movable flashboards 40 can also comprise on the sidewall that is positioned at this furnace chamber 11 then can be near the center of this furnace chamber 11 and inwardly or away from the center of this furnace chamber 11 outside mobile (the movable flashboard being positioned on furnace chamber sidewall is not shown on figure).This activity flashboard 40 and this chassis 20 match.That is, after those movable flashboards 40 fall or move inward, can be pressed in or be pressed on this chassis 20 top of the steel scrap loading or sidepiece for stoping hot smoke gas flow from the spatial flow mistake except steel scrap gap, add the forced convertion of heat-flash smoke gas flow and steel scrap; And after these activity flashboard 40 rises or outside movement, this chassis 20 can move.Such as, more specifically, the both sides with movable flashboard 40, each chassis 20 of the top correspondence of each chassis 20 are all corresponding has respectively a movable flashboard 40.Like this, because chassis moves in kiln, between stove and steel scrap, be difficult to accomplish very close to each other, simultaneously, because steel scrap useful load on every chassis 20 is different, and the gap of 11 of the steel scrap on every chassis 20 and this furnace chambers also changes, and this can allow mass air flow from Rapid Flow mistake between these gaps, cause middle part, the bottom convection heat transfer' heat-transfer by convection of steel scrap layer less, the temperature of scrap steel preheating that is positioned at this place is just lower.And the movable flashboard 40 of every chassis 20 top or side puts down or moves inward when chassis 20 does not move, be pressed in or be against on steel scrap, hot smoke gas flow is forced through steel scrap, hot smoke gas flow and steel scrap forced convection heat transfer then.When reinforced mobile those chassis 20 of needs, only need those movable flashboards 40 to remove.
Further say, this air inlet flue 31 is communicated in a side of this furnace chamber 11 by least 2 air inlets 311, and those air inlets 311 are arranged from left to right.And the hot smoke gas flow segmentation in this air inlet flue 31 enters in this furnace chamber 11.This flue 32 of giving vent to anger is communicated in the opposite side of this furnace chamber 11 by least 2 gas outlets 321, arrange from left to right those gas outlets 321.That is, this furnace chamber 11 is flowed out in the hot smoke gas flow segmentation after heat exchange.More specifically, those air inlets 311 are adjacent between two with those gas outlets 321.That is, air inlet 311 and gas outlet 321 are spaced apart, and from their side projection, their distribution is: air inlet 311, gas outlet 321, air inlet 311, gas outlet 321......, by that analogy.And, between adjacent air inlet 311 and gas outlet 321, there is at least 1 chassis 20.Like this, hot flue gas is divided into a plurality of passages to entering this furnace chamber 11, hot smoke gas flow in each passage enters after this furnace chamber 11, from a side of chassis 20, enter, from opposite side, extract out, the hot flue gas of extraction can enter separately the preheating of next stage, also can be aggregated into total pipeline, divide again to each passage and enter hankering in advance of next stage, thereby the waste heat of hot smoke gas flow is further reclaimed, reach the effect that improves the thermal efficiency.
The distribution of aforementioned air inlet 311 and the gas outlet 321 and flow of flue gas mode that forms can be called parallel preheating.And in the scrap preheater of traditional tunnel type, whole hot flue gases enters from high temperature section one end of preheating device, from low-temperature zone one end, discharge, can be called tandem preheating.Suppose to have a tunnel type preheating device, be full of steel scrap in stove, total length is L, the steel scrap in this device of hot smoke pre-heating that is now Q with flow, and these two kinds of fume exhausting types compare roughly, analyze the pressure loss ratio of its air-flow in steel scrap.
Suppose that the space between the steel scrap of preheating device is constant, and the equivalent diameter in space is D, the coefficient of frictional resistance λ of air-flow in steel scrap remains unchanged, and ignores the temperature of flue gas and the impact of dust, and the bulk density ρ of flue gas remains unchanged:
Series system, whole flue gases enters, from stove tail, discharges mode from burner.The pressure loss of its air-flow in steel scrap is:
△P1=λ（L/D）(V12*ρ/2) (1)
V1 is air-flow flowing velocity in the steel scrap of tandem preheating.
Parallel way, is divided into n air inlet from air inlet flue 31 and enters stove, enters after the hot flue gas and adjacent chassis steel scrap forced convertion of stove, from gas outlet, discharges, and supposes that each air inlet is equal to the distance of gas outlet.The pressure loss of its air-flow in steel scrap is:
△P2=λ（L/（2n）/D）(V22*ρ/2) (2)
V2 is the flowing velocity of parallel way downstream in steel scrap.
Due to V2=V1/ (2n) (3)
By equation (3) substitution equation (2)
△P2=λ（L/D）(V12*ρ/2)* (0.5n-1)*(0.25n
-2)=0.125n
-3△P1
Suppose that parallel way preheating furnace has 6 chassis, three air inlets, the resistance of hot flue gas in steel scrap is 500Pa, the resistance of the air-flow of use series system preheating in the steel scrap of same 6 chassis is 108000Pa so.That is so large resistance flue gas in actual production that, series system forms cannot be taken out movingly.
So, in the scrap steel preheating of tunnel type in the past, do not resolve in long tunnel preheating furnace, when hot flue gas and steel scrap forced convertion, the too large problem of the resistance of flue gas in steel scrap, all become optional convection current, instant heating flue gas can flow freely above steel scrap layer, and such preheating furnace unavoidably all exists several problems: 1) bottom heating weak effect; 2) stove is oversize; 3) stove tail low-temperature flue gas goes preheating just to enter the steel scrap of stove, produces a large amount of dioxin.
For this reason, in the present embodiment, the right part of furnace chamber 11 has an air inlet 311 adjacent to this charging fire door 13.That is this air inlet 311 is as far as possible near this charging fire door 13.That is to say, tandem scrap steel preheating easily produces a large amount of dioxin, when preheating tunnel is longer, after hot flue gas and steel scrap heat exchange, temperature constantly declines, when the temperature of useless flue gas, between 600～300 ℃, go preheating and just entered the steel scrap of preheating device, in steel scrap, contain compound imperfect combustion at this temperature of chlorine, as easy as rolling off a log generation dioxin.And parallel scrap steel preheating has solved this problem, the a part of warm flue gas of height (flue gas of general electric furnace is all greater than 1000 ℃) enters from the air inlet of stove tail, sneak into the air of part and directly light compound chloride in steel scrap, these chloride compounds are completed with regard to high-temp combustion when just entering preheating furnace, greatly reduced the discharge of dioxin.And the position of closing on charging fire door 13 is arranged to air inlet 311, the air of sneaking into appropriate amount with the high-temperature flue gas of part removes to light the chlorine-containing compound in the steel scrap that has just entered preheating device, these chlorine-containing compounds are at high temperature burnt, reduced the discharge of dioxin.
Continue to optimize the right-hand hydraulic cylinder 50 that is provided with in outside of this body of heater 10.Like this, being convenient to promote chassis 20 by this hydraulic cylinder 50 moves.This air inlet 311 is chewed alternative with burning.That is, hot flue gas can be waste heat, can be also the hot flue gas that combustion gas burning is chewed or other fuel combustions produce.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes description of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band, comprise body of heater (10), this body of heater (10) has the furnace chamber (11) at the two ends, left and right that connect this body of heater (10), and the left end opening of this furnace chamber (11) is provided with discharging door (12), right-end openings is provided with charging fire door (13), simultaneously, the car-type scrap steel preheating stove of the movable flashboard lower resistance of this band is furnished with the chassis (20) for loading steel scrap, and, this furnace chamber (11) is communicated with air inlet flue (31) and the flue of giving vent to anger (32), it is characterized in that: in described furnace chamber (11), be provided with at least 1 movable flashboard (40), this activity flashboard (40) and this chassis (20) match.
2. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band according to claim 1, it is characterized in that: described air inlet flue (31) is communicated in a side of this furnace chamber (11) by least 2 air inlets (311), and those air inlets (311) are arranged from left to right, this flue of giving vent to anger (32) is communicated in the opposite side of this furnace chamber (11) by least 2 gas outlets (321), and arrange from left to right those gas outlets (321), simultaneously, those air inlets (311) are adjacent between two with those gas outlets (321), and there is at least 1 chassis (20) between adjacent air inlet (311) and gas outlet (321).
3. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band according to claim 2, is characterized in that: the right part of described furnace chamber (11) has an air inlet (311) adjacent to this charging fire door (13).
4. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band according to claim 2, is characterized in that: described air inlet (311) with burn chew alternative.
5. according to the car-type scrap steel preheating stove of the movable flashboard lower resistance of the band described in any one in claim 1 to 4, it is characterized in that: the right-hand hydraulic cylinder (50) that is provided with in outside of described body of heater (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410398067.5A CN104121784B (en) | 2014-08-14 | 2014-08-14 | The car-type scrap steel preheating stove of the movable flashboard lower resistance of band |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410398067.5A CN104121784B (en) | 2014-08-14 | 2014-08-14 | The car-type scrap steel preheating stove of the movable flashboard lower resistance of band |
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| CN104121784A true CN104121784A (en) | 2014-10-29 |
| CN104121784B CN104121784B (en) | 2016-03-16 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08157930A (en) * | 1994-12-01 | 1996-06-18 | Nippon Steel Corp | Device for conveying scrap |
| CN1907895A (en) * | 2005-08-02 | 2007-02-07 | 王世忠 | Vacuum welding furnace for producing building vacuum glass plate |
| CN202074839U (en) * | 2011-05-19 | 2011-12-14 | 西安电炉研究所有限公司 | Environment friendly scrap preheater |
| CN202558802U (en) * | 2011-12-23 | 2012-11-28 | 贵州桑立洁净能源科技开发有限公司 | Dry quenching whole sealing continuous type coal carbonizing furnace with isolation area |
| CN103822489A (en) * | 2014-03-21 | 2014-05-28 | 张昌剑 | Waste-steel continuous preheating method and waste-steel continuous preheating device |
| CN203980913U (en) * | 2014-08-14 | 2014-12-03 | 张昌剑 | The car-type scrap steel preheating stove of the movable flashboard lower resistance of band |
-
2014
- 2014-08-14 CN CN201410398067.5A patent/CN104121784B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08157930A (en) * | 1994-12-01 | 1996-06-18 | Nippon Steel Corp | Device for conveying scrap |
| CN1907895A (en) * | 2005-08-02 | 2007-02-07 | 王世忠 | Vacuum welding furnace for producing building vacuum glass plate |
| CN202074839U (en) * | 2011-05-19 | 2011-12-14 | 西安电炉研究所有限公司 | Environment friendly scrap preheater |
| CN202558802U (en) * | 2011-12-23 | 2012-11-28 | 贵州桑立洁净能源科技开发有限公司 | Dry quenching whole sealing continuous type coal carbonizing furnace with isolation area |
| CN103822489A (en) * | 2014-03-21 | 2014-05-28 | 张昌剑 | Waste-steel continuous preheating method and waste-steel continuous preheating device |
| CN203980913U (en) * | 2014-08-14 | 2014-12-03 | 张昌剑 | The car-type scrap steel preheating stove of the movable flashboard lower resistance of band |
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| CN104121784B (en) | 2016-03-16 |
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