CN104121784B - The car-type scrap steel preheating stove of the movable flashboard lower resistance of band - Google Patents
The car-type scrap steel preheating stove of the movable flashboard lower resistance of band Download PDFInfo
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- CN104121784B CN104121784B CN201410398067.5A CN201410398067A CN104121784B CN 104121784 B CN104121784 B CN 104121784B CN 201410398067 A CN201410398067 A CN 201410398067A CN 104121784 B CN104121784 B CN 104121784B
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- furnace chamber
- air inlet
- movable flashboard
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- flue
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Abstract
The invention discloses a kind of car-type scrap steel preheating stove with movable flashboard lower resistance, comprise body of heater, this body of heater has furnace chamber, and the left end opening of this furnace chamber is provided with discharging door, right-end openings is provided with charging fire door, this scrap steel preheating stove is furnished with the chassis for loading steel scrap, this furnace chamber is communicated with air inlet flue and flue of giving vent to anger, and is provided with at least 1 movable flashboard in described furnace chamber, and this movable flashboard and this chassis match; Described air inlet flue is communicated in the side of this furnace chamber by least 2 air inlets, and those air inlets arrange 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, those gas outlets arrange from left to right, those air inlets are adjacent between two with those gas outlets, have at least 1 chassis between adjacent air inlet and gas outlet; The right part of furnace chamber has an air inlet adjacent to this charging fire door.Advantage of the present invention is: pre-heat effect is better, and equipment cost is lower, greatly reduces the dioxin produced in scrap steel 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
Be in the electric furnace steel making of primary raw material with steel scrap, scrap steel preheating is the major measure reducing power consumption and improve production capacity.At present in the scrap steel preheating supporting with electric furnace, representative manner has shaft furnace mode and horizontal continuity transfer ways, and device therefor is such as comb formula shaft furnace electric arc furnaces and Kang Sidi electric arc furnaces (i.e. consteel electric arc furnaces) respectively.In comb formula shaft furnace, the heat smoke of electric furnace enters from the lower end of vertical shaft, discharges from the upper end of vertical shaft.Like this, the section of vertical shaft will have enough large, and heat smoke could be allowed to flow through in gap between steel scrap.In actual production, the finger of water-cooled is combed easily to be smashed by steel scrap and is leaked, or is blocked by steel scrap, and the cost of equipment is high, and plant maintenance amount is large, so the large stove use that comb formula shaft furnace is only a part of on electric furnace steel making.The heat smoke of Kang Sidi electric arc furnaces runs flowing against steel scrap in preheating device, because steel scrap cannot be full of in the preheating device of level, the air-flow of most is had 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, usually need the preheating tunnel of 60 meters long.Owing to having chloride compound in steel scrap, as PVC etc., in theory, these chloride compounds will produce dioxin lower than 800 DEG C of imperfect combustions, and within the scope of 300 ~ 500 DEG C, imperfect combustion the most easily produces dioxin especially, because the preheating tunnel of Kang Sidi stove is longer, after heat smoke and steel scrap heat exchange, temperature constantly reduces, and makes the as easy as rolling off a log generation dioxin under imperfect combustion between 300 ~ 500 DEG C of the chloride compound 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, and pre-heat effect is better, equipment cost is lower, and greatly can be reduced in the feature of 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 of this body of heater through, 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 the chassis for loading steel scrap, and, this furnace chamber is communicated with air inlet flue and flue of giving vent to anger, be provided with at least 1 movable flashboard in described furnace chamber, this movable flashboard and this chassis match;
Described air inlet flue is communicated in the side of this furnace chamber by least 2 air inlets, and those air inlets arrange 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 those gas outlets arrange from left to right, simultaneously, those air inlets are adjacent between two with those gas outlets, and have at least 1 chassis between adjacent air inlet and gas outlet;
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 outside right of described body of heater is provided with a hydraulic cylinder.
The present invention is advantageously: 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 heat smoke stream and steel scrap define forced convection heat transfer, reaches good pre-heat effect.Meanwhile, by making heat smoke flow point section enter in furnace chamber, heat the steel scrap on different chassis respectively, the sectional area making heat smoke flow through steel scrap increases, and reduces the resistance that heat smoke stream flows in steel scrap, reaches good pre-heat effect equally.And this equipment used unit is less, without the need to larger volume, then cost lower, be easy to safeguard.2, the dioxin produced 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 arranging the mode of air inlet at stove tail, make the temperature at this place higher, about be greater than 1000 DEG C, the part air be mixed into is made directly to light compound chloride in steel scrap, the compound making these chloride completes with regard to high-temp combustion when just entering preheating furnace, greatly reduces the discharge of dioxin.That is, lighted with the air that the high-temperature flue gas of part is mixed into appropriate amount the chlorine-containing compound just entered in the steel scrap of preheating device, these chlorine-containing compounds have at high temperature been burnt, decreases 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 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 band of embodiments of the invention;
Fig. 3 is the section structure schematic diagram (amplifying relative to Fig. 1) of the car-type scrap steel preheating stove of the movable flashboard lower resistance of 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, flue of giving vent to anger, 321, gas outlet; 40, movable flashboard; 50, hydraulic cylinder.
Detailed description of the invention
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 of this body of heater 10 through, 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 the chassis 20 for loading 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 flue 32 of giving vent to anger.Heat smoke is passed in this air inlet flue 31.This heat smoke can adopt waste heat, also can be that combustion gas burning is chewed or other fuel directly add thermogenetic heat smoke.That is, steel scrap is loaded on every portion chassis 20, and those chassis 20 push in this furnace chamber 11 from stove tail successively, steel scrap on those chassis 20 passes through and heat smoke carries out heat exchange, steel scrap is heated, heats 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 movable flashboard 40 is by a steel wire hang, and this steel wire rope is connected with motor.Those movable flashboards 40 can also comprise be positioned at this furnace chamber 11 sidewall on then can near the center of this furnace chamber 11 inwardly or away from the center of this furnace chamber 11 (the movable flashboard be positioned on furnace chamber sidewall is not shown on figure) of outside movement.This movable flashboard 40 and this chassis 20 match.That is, those movable flashboards 40 can be pressed in or be pressed on the top of steel scrap that this chassis 20 loads or sidepiece flows through from the space except steel scrap gap for stoping heat smoke stream after falling or moving inward, and strengthen the forced convertion of heat smoke stream and steel scrap; And this movable flashboard 40 rises or after outwards moving, this chassis 20 can move.Such as, more specifically, each chassis 20 top correspondence have movable flashboard 40, each chassis 20 both sides all corresponding there is a movable flashboard 40 respectively.Like this, because chassis moves in kiln, be difficult to accomplish very close to each other between stove and steel scrap, simultaneously, because the steel scrap useful load on every portion chassis 20 is different, and the steel scrap on every portion chassis 20 and the gap between this furnace chamber 11 are also changes, and this can allow mass air flow flow fast through between these gaps, cause the middle part of steel scrap layer, bottom convection heat transfer' heat-transfer by convection less, the temperature being positioned at the scrap steel preheating at this place is just lower.And above every portion chassis 20 or the movable flashboard 40 of side put down when chassis 20 does not move or move inward, be pressed in or be against on steel scrap, make heat smoke stream be forced through steel scrap, then heat smoke stream and steel scrap forced convection heat transfer.When reinforced those chassis 20 mobile of needs, only need those movable flashboards 40 to remove.
Further say, this air inlet flue 31 is communicated in the side of this furnace chamber 11 by least 2 air inlets 311, those air inlets 311 arrange from left to right.And the heat smoke flow point section 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, those gas outlets 321 arrange from left to right.That is, the heat smoke flow point section after heat exchange flows out this furnace chamber 11.More specifically, those air inlets 311 are adjacent between two with those gas outlets 321.That is, air inlet 311 and gas outlet 321 spaced apart, from the projection of their side, 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, heat smoke is divided into multiple passage to entering this furnace chamber 11, after heat smoke in each passage flows to this furnace chamber 11, enter from the side of chassis 20, extract out from opposite side, the heat smoke of extraction can enter separately the preheating of next stage, also total pipeline can be aggregated into, divide again to each passage and enter hankering in advance of next stage, thus the waste heat of heat smoke stream is reclaimed further, reach the effect improving the thermal efficiency.
The distribution of aforementioned air inlet 311 and the gas outlet 321 and flow of flue gas mode formed can be called parallel preheating.And in the scrap preheater of traditional tunnel type, whole heat smoke enters from high temperature section one end of preheating device, discharge from low-temperature zone one end, tandem preheating can be called.Suppose there is a tunnel type preheating device, be full of steel scrap in stove, total length is L, and be now the steel scrap in this device of heat smoke preheating of Q with flow, these two kinds of fume exhausting types compare roughly, analyze the pressure loss ratio of its air-flow in steel scrap.
Assuming that the space between the steel scrap of preheating device is constant, and the equivalent diameter in space is D, and the coefficient of frictional resistance λ of air-flow in steel scrap remains unchanged, and ignore the temperature of flue gas and the impact of dust, the bulk density ρ of flue gas remains unchanged:
Series system, namely whole flue gases enters from burner, discharge mode from stove tail.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 to enter stove from air inlet flue 31, after the heat smoke entering stove and adjacent chassis steel scrap forced convertion, discharges, suppose that each air inlet is equal to the distance of gas outlet from 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)
Equation (3) is substituted into 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 heat smoke in steel scrap is 500Pa, and the resistance of air-flow in the steel scrap of same 6 chassis so using series system preheating is then 108000Pa.That is, so large resistance flue gas in actual production that series system is formed cannot be taken out dynamic.
So, in the scrap steel preheating of tunnel type in the past, do not resolve in long tunnel preheating furnace, when heat smoke and steel scrap forced convertion, the problem that the resistance of flue gas in steel scrap is too large, all become optional convection current, namely heat smoke can flow freely above steel scrap layer, and such preheating furnace unavoidably all exists Railway Project: 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, tandem scrap steel preheating easily produces a large amount of dioxin, when preheating tunnel is longer, after heat smoke and steel scrap heat exchange, temperature constantly declines, when the temperature of useless flue gas goes preheating just to enter the steel scrap of preheating device between 600 ~ 300 DEG C, the compound imperfect combustion at this temperature containing chlorine in steel scrap, as easy as rolling off a log generation dioxin.And parallel scrap steel preheating solves this problem, a part of high-temperature hot flue gas (flue gas of general electric furnace is all greater than 1000 DEG C) enters from the air inlet of stove tail, the air being mixed into part directly lights compound chloride in steel scrap, the compound making these chloride completes with regard to high-temp combustion when just entering preheating furnace, greatly reduces the discharge of dioxin.And the position closing on charging fire door 13 is arranged air inlet 311, the air being mixed into appropriate amount with the high-temperature flue gas of part removes to light the chlorine-containing compound just entered in the steel scrap of preheating device, these chlorine-containing compounds are at high temperature burnt, decreases the discharge of dioxin.
Continue to optimize, the outside right of this body of heater 10 is provided with a hydraulic cylinder 50.Like this, be convenient to promote chassis 20 by this hydraulic cylinder 50 move.This air inlet 311 is chewed alternative with burning.That is, hot heat smoke can be waste heat, also can be the heat smoke that combustion gas burning is chewed or other fuel combustions produce.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; 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 (3)
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 of through 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 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 movable flashboard (40) and this chassis (20) match,
Described air inlet flue (31) is communicated in the side of this furnace chamber (11) by least 2 air inlets (311), and those air inlets (311) arrange 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 those gas outlets (321) arrange from left to right, simultaneously, those air inlets (311) are adjacent between two with those gas outlets (321), and have at least 1 chassis (20) between adjacent air inlet (311) and gas outlet (321);
The right part of described furnace chamber (11) has an air inlet (311) adjacent to this charging fire door (13).
2. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band according to claim 1, is characterized in that: described air inlet (311) with burn chew alternative.
3. the car-type scrap steel preheating stove of the movable flashboard lower resistance of band according to claim 1, is characterized in that: the outside right of described body of heater (10) is provided with a hydraulic cylinder (50).
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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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| 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 CN104121784A (en) | 2014-10-29 |
| CN104121784B true CN104121784B (en) | 2016-03-16 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08157930A (en) * | 1994-12-01 | 1996-06-18 | Nippon Steel Corp | Device for conveying scrap |
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2014
- 2014-08-14 CN CN201410398067.5A patent/CN104121784B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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