CN104962670B - Method for recovering waste heat of melting slag - Google Patents

Method for recovering waste heat of melting slag Download PDF

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Publication number
CN104962670B
CN104962670B CN201510412028.0A CN201510412028A CN104962670B CN 104962670 B CN104962670 B CN 104962670B CN 201510412028 A CN201510412028 A CN 201510412028A CN 104962670 B CN104962670 B CN 104962670B
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slag
liquid
heat
melting
low
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CN104962670A (en
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周振华
周强
秦涔
喻道明
柳萌
闫朝付
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Wisdri Engineering and Research Incorporation Ltd
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Wisdri Engineering and Research Incorporation Ltd
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Abstract

The invention discloses a method for recovering waste heat of melting slag. The method comprises the following steps of injecting high-temperature melting slag into a heat recovery pool, mixing the melting slag with molten metal with low melting point in the heat recovery pool while quickly cooling the melting slag into solid furnace slag, wherein the melting slag and the molten metal with the low melting point are subject to quick heat transfer, besides, the solid furnace slag floats to form a scum layer, and scums are discontinuously or continuously discharged; absorbing the heat of the molten metal with the low melting point by a vaporization cooling device arranged in the heat recovery pool to vaporize liquid in a sealing pipeline of the vaporization cooling device; preserving the formed steam for recycling. According to the method for recovering the waste heat of the melting slag, provided by the invention, the problems of high power consumption, high heat recovery difficulty, low heat recovery efficiency, difficult utilization of the melting slag after heat recovery and the like existing in an air quenching method and a revolving cup method are solved.

Description

A kind of method of liquid slag waste heat recovery
Technical field
The present invention relates to heat recovery technology field, more particularly to a kind of method of liquid slag waste heat recovery.
Background technology
Metallurgy molten slag is the byproduct of pyrometallurgy production, and temperature is contained in slag typically between 1200 DEG C ~ 1600 DEG C Physics heat it is considerable, the Huge value of recycling.By taking the blast furnace of annual production 100wt as an example, the ton iron product quantity of slag ~ 300kg, blast furnace slag temperature ~ 1450 DEG C, ton slag sensible heat produced per year equivalent to 59kg standard coals, then sensible heat contained by blast furnace slag equivalent to 1.77wt standard coal;Smelting low ore grade nickel ore(Ni2% ~ 5%, Fe10% ~ 15%)During production dilval, with production 1t nickel Temperature produced by ferroalloy is that 1500 DEG C ~ 1600 DEG C of molten slag is more up to 35t, is rationally and effectively reclaimed more than liquid slag Heat is the extremely urgent energy saving task of pyrometallurgy industry.
It is the high-temperature residual heat of effective recycling metallurgy molten slag, various countries metallargist tests many methods, exploitation Various informative technological process and technological equipment, are divided by property, can be divided into Physical and chemical method.
Representational Physical has:Shotting and rotating-cylinder method.
Liquid slag granulation mode has pressure-air to impact two kinds of granulation and revolving cup centrifugal granulation, therefore shotting is divided into wind again Shotting of quenching and revolving cup shotting.High temperature furnace slag after granulation is cooled down by air in a heat exchanger, and high temperature air obtains slag Heat turns into the thermal source that can conveniently utilize.Research of the people to shotting recovery liquid slag waste heat for a long time is more, formation Process respectively has feature, but liquid slag is granulated and air is for the core of carrier displacement liquid slag waste heat is the same, thus leads The liquid slag glass rate that air dielectric consumption is big, power consumption is greatly and after treatment of cause is low to be difficult by being the treatment of this class The common fault of method, has been difficult to a kind of suitable method and has been obtained in that popularization and application so far.
Rotating-cylinder method is using the rotating cylinder cooling liquid slag of a pair of reverse rotations, in gap of the liquid slag between two rotating cylinders By and be cooled into flaky solid slag, the heat that fluid media (medium) in rotating cylinder obtains liquid slag is used to generate electricity or heat.Turn The shortcoming of cylinder method is that liquid slag is bonded on rotating cylinder be difficult to treatment clean, inefficiency, the heat of equipment after long-play The rate of recovery and life-span are decreased obviously, in addition, the liquid slag glass rate after treatment is also difficult to ensure that higher level.Follow-up study is selected Liquid slag is processed with the method to gradually decrease.
The core of chemical method is recycled the heat of high temperature furnace slag as the thermal source of chemical reaction.See report Have certain hydrogen and CO gas generated under slag thermal effect at high temperature using the mixture of methane and vapor Experimental study.Chinese scholar proposed a kind of coal gasifier based on centrifugal granulation device, and it is coal that it utilizes blast-furnace cement sensible heat Gasification provides heat.Up to current, the scheme of liquid slag waste heat is reclaimed using chemical reaction production fuel gas still in general Read design and the theory study stage, apart from practical application also have quite poor away from.
To sum up, up to the present, there is not yet ripe, stabilization, reliable, economic liquid slag exhaust heat recovering method and technique Large-scale industrial application and popularization are obtained, liquid slag waste heat recovery is still the heat of metallurgy industry problem urgently to be resolved hurrily and research Point.
The content of the invention
It is a primary object of the present invention to provide a kind of method of liquid slag waste heat recovery, it is intended to which the waste heat to liquid slag enters Row is reclaimed, and innovatively application liquid low-melting-point metal is dielectric film filter liquid slag waste heat, fundamentally overcomes wind quenching method and revolving cup The power consumption of method is big, the problem that heat recovery difficulty is high, heat recovery efficiency is low.
To achieve the above object, a kind of method of liquid slag waste heat recovery of the invention, comprises the following steps:
By in the liquid slag injection recuperation of heat pond of high temperature, the liquid slag mixes with the low-melting-point metal liquid in recuperation of heat pond While be cooled rapidly into solid-state slag, wherein, low-melting-point metal be fusing point in 500 DEG C and following metal or alloy, institute State the high-temperature molten slag that liquid slag is produced for iron and steel industry or nonferrous metallurgy;
Liquid slag realizes that heat is quickly transmitted with low-melting-point metal liquid, while solid-state slag floats to form scum layer, scum silica frost Interruption or continuous discharge;
The heat that the apparatus for vapour-cooling set in recuperation of heat pond absorbs low-melting-point metal liquid makes its liquid in sealing pipeline Body is vaporized, and the steam of formation is for recycling.
Preferably, stir the low-melting-point metal liquid using mechanical agitation and/or inertia gases at high pressure, make liquid slag with it is low The heat of melting point metals liquid is quickly transmitted, and promotes recuperation of heat pond temperature uniform.
Preferably, it is blown inert gas to protect low-melting-point metal liquid not oxidation by air to low-melting-point metal liquid surface.
Preferably, the sealing pipeline of apparatus for vapour-cooling is distributed in top, madial wall and the bottom in recuperation of heat pond, and liquid is situated between Matter is first heated through the sealing pipeline at top, and steam is heated to form by the sealing pipeline of madial wall and bottom.
The present invention proposes a kind of method of liquid slag waste heat recovery, with advantages below:
1st, in the present invention, liquid slag waste heat passes to the liquid medium in apparatus for vapour-cooling through low-melting-point metal liquid, in Between link low-melting-point metal liquid heat-transfer capability it is strong, and do not consume additionally and take away heat, total system is to liquid slag waste heat The rate of recovery is high;
2nd, in the present invention steam of apparatus for vapour-cooling production temperature is high, pressure is high, belong to high-quality thermal source, its utilization Value is high;
3rd, the low-melting-point metal liquid heat transfer efficiency for being used in the present invention is high, therefore, heat reclamation device small volume, floor space It is small;
4th, the present invention is for when processing molten blast furnace slag, can simultaneously take into account the purpose and guarantor that reclaim molten blast furnace slag waste heat Card blast furnace slag is used as the purposes of cement raw material;
5th, the present invention also can be low as a kind of liquid slag processing method, its consumption to water, can effectively alleviate water resource The short water supply of deficient area flush slag method.
Brief description of the drawings
Fig. 1 is the sectional structure of the waste-heat recovery device of the method preferred embodiment use of liquid slag waste heat recovery of the present invention Schematic diagram;
Fig. 2 is the plan structure of the waste-heat recovery device of the method preferred embodiment use of liquid slag waste heat recovery of the present invention Schematic diagram.
In figure, 1- slag ladles, 2- agitators, 3- recuperations of heat pond, 4- slag-draining devices, 5- apparatus for vapour-cooling, 6- low melting points gold Category liquid, 7- scum layers, 8- bottom blowing stirring devices, 9- exhaust outlets, 10- tops blowing device, 11- mops, 12- receives cinder notch.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
The present invention proposes a kind of method of liquid slag waste heat recovery.
In this preferred embodiment, the method for liquid slag waste heat recovery is comprised the following steps:
By in the liquid slag injection recuperation of heat pond of high temperature, the liquid slag mixes with the low-melting-point metal liquid in recuperation of heat pond While be cooled rapidly into solid-state slag, wherein, low-melting-point metal be fusing point in 500 DEG C and following metal or alloy, institute State the high-temperature molten slag that liquid slag is produced for iron and steel industry or nonferrous metallurgy;
Liquid slag realizes that heat is quickly transmitted with low-melting-point metal liquid, while solid-state slag floats to form scum layer, scum silica frost Interruption or continuous discharge;
The heat that the apparatus for vapour-cooling set in recuperation of heat pond absorbs low-melting-point metal liquid makes its liquid in sealing pipeline Body is vaporized, and the steam of formation is for recycling.
Further, the method for this liquid slag waste heat recovery also includes being stirred using mechanical agitation and/or inertia gases at high pressure The low-melting-point metal liquid is mixed, liquid slag is quickly transmitted with the heat of low-melting-point metal liquid, promote recuperation of heat pond temperature uniform. Using during low-melting-point metal liquid, the depth and its blade rotational speed that mechanical stirring device stretches into below liquid level can described in mechanical agitation Adjustment.When stirring the low-melting-point metal liquid using inertia gases at high pressure, bottom blowing stirring dress can be set in the bottom in recuperation of heat pond Put.
Further, it is blown inert gas to protect low-melting-point metal liquid not by air oxygen to low-melting-point metal liquid surface Change.Correspondingly, top blowing device is set to be blown inert gas.
Further, mop is additionally provided with recuperation of heat pond scum silica frost to be collected into slag-drip opening so as to deslagging and is prevented Scum silica frost enters by slag point formation scum layer.
Specifically, the sealing pipeline of apparatus for vapour-cooling is distributed in top, madial wall and the bottom in recuperation of heat pond, and liquid is situated between The sealing pipeline that matter first flows through top is heated, and steam is heated to form by the sealing pipeline of madial wall and bottom.Low melting point gold Category liquid can be in the sealing pipeline by modes such as radiation, convection current, heat conduction to bottom and madial wall liquid medium heat, it is lazy Property gas by way of convection heat transfer' heat-transfer by convection and heat transfer by heat conduction, to recuperation of heat pond top sealing pipeline in liquid medium carry out Heating.Steam, steam is produced to can be used to generate electricity or warm oneself after liquid medium heating.
In the present embodiment, apparatus for vapour-cooling heat recovery is divided into two steps, the first step is that liquid medium is sealed at top It is heated in pipeline;Second step is that heated liquid medium is still heated and vaporizes in side wall and bottom again.Now, pass through In different space reclamation heats, overall heat recovery rate is improve.
Procedure below is completed in recuperation of heat pond:
1st, mix:Under the collective effect of high-temperature molten slag itself kinetic energy and low-melting-point metal liquid flow field, liquid slag with Low-melting-point metal liquid is sufficiently mixed.
2nd, stir:Mechanical stirring device or/and inertia stirring gas are done work to low-melting-point metal liquid, the eutectic of different parts The existing speed difference of molten metal outflow is selected, mixing effect is produced.
3rd, exchange heat:Liquid slag is sufficiently mixed with low-melting-point metal liquid, is in close contact, and low-melting-point metal liquid heat-transfer capability By force, rapid heat exchange is capable of achieving, the effect of chilling liquid slag is produced, it is ensured that the liquid slag after treatment obtains high-vitrification rate.
4th, float:The proportion of liquid slag is less than low-melting-point metal liquid, therefore, intersperse among the solid slag in low-melting-point metal liquid In buoyancy float downward, while also easily being captured by ascending gas bubbles and bringing scum layer into.
5th, separate:Low-melting-point metal liquid is big with the angle of wetting of solid slag, therefore, be therebetween not in infiltration phenomenon, Under gravity, both are automatically separated.
The method of liquid slag waste heat recovery proposed by the present invention, with advantages below:
1st, in the present invention, liquid slag waste heat passes to the liquid medium in apparatus for vapour-cooling through low-melting-point metal liquid, in Between link low-melting-point metal liquid heat-transfer capability it is strong, and do not consume additionally and take away heat, the rate of recovery to liquid slag waste heat is high;
2nd, in the present invention steam of apparatus for vapour-cooling production temperature is high, pressure is high, belong to high-quality thermal source, its utilization Value is high;
3rd, the low-melting-point metal liquid heat transfer efficiency for being used in the present invention is high, therefore, heat reclamation device small volume, floor space It is small;
4th, the present invention is for when processing molten blast furnace slag, can simultaneously take into account the purpose and guarantor that reclaim molten blast furnace slag waste heat Card blast furnace slag is used as the purposes of cement raw material;
5th, the present invention also can be low as a kind of liquid slag processing method, its consumption to water, can effectively alleviate water resource The short water supply of deficient area flush slag method.
Method for the waste heat recovery of this liquid slag is better described, the method to the waste heat recovery of this liquid slag is recovered using one Receiving apparatus are specifically described.Referring to Figures 1 and 2, a kind of liquid slag waste-heat recovery device, including accommodate low-melting-point metal The recuperation of heat pond 3 of liquid 6, the apparatus for vapour-cooling 5 for absorbing the heat of low-melting-point metal liquid 6 in recuperation of heat pond 3, and for right The agitating device that liquid slag in injection recuperation of heat pond 3 is stirred, wherein,
Recuperation of heat pond 3 is provided with for the liquid slag for high temperature into recuperation of heat pond 3 by cinder notch 12(The melting of slag ladle outflow Slag undergoes cinder notch 12 and pours into recuperation of heat pond 3), for by after cooling liquid slag discharge slag-draining device 4, for will cooling after Liquid slag enter the slag-drip opening of slag-draining device 4, and for scum silica frost being collected into slag-drip opening so as to deslagging and preventing scum silica frost from entering Enter the mop 11 that scum layer 7 is formed by slag point, apparatus for vapour-cooling 5 includes accommodating the sealing pipeline of liquid medium, and this is close Vaporized for recycling after the heat of the liquid medium absorption low-melting-point metal liquid 6 in tube sealing road.
Low-melting-point metal be fusing point in 500 DEG C and following metal or alloy, liquid slag is iron and steel industry or nonferrous metallurgy The high-temperature molten slag of production.Specifically, agitating device includes stretching into the agitator 2 in recuperation of heat pond 3, the blade of the agitator 2 Rotate and drive the rotational flow in recuperation of heat pond 3 of low-melting-point metal liquid 6.In addition, agitator 2 stretch into the depth in recuperation of heat pond 3 with And the rotating speed of blade can adjust.
Further, agitating device also includes the bottom blowing for being blown high-pressure inert gas positioned at the bottom of recuperation of heat pond 3 Agitating device 8, high-pressure inert gas are stirred after being sprayed through bottom blowing stirring device 8 to low-melting-point metal liquid 6, recuperation of heat pond 3 It is additionally provided with for the exhaust outlet 9 for inert gas discharge.By setting bottom blowing stirring device 8, make low-melting-point metal liquid 6 and melting Slag can be contacted fully, improve mixing effect, so as to improve the heat recovery efficiency of this liquid slag waste-heat recovery device.
Further, this liquid slag waste-heat recovery device also includes being used to be blown indifferent gas to the surface of low-melting-point metal liquid 6 The top blowing device 10 of body, now, inert gas shielding atmosphere is formed on the liquid level of low-melting-point metal liquid 6, it is to avoid eutectic Molten metal 6 is selected to be aoxidized with air contact.
In the present embodiment, the top in recuperation of heat pond 3, madial wall and bottom are provided with apparatus for vapour-cooling, liquid medium Flow through top sealing pipeline and flow into the sealing pipeline of bottom and madial wall to absorb heat.Low-melting-point metal liquid 6 can by radiation, The modes such as convection current, heat conduction are heated to the liquid medium in the sealing pipeline of bottom and madial wall, and inert gas passes through convection current Heat transfer and the mode of heat transfer by heat conduction, heat, liquid medium to the liquid medium in the top of recuperation of heat pond 3 sealing pipeline Steam is generated after heating, steam can be used to generate electricity or warm oneself.
By apparatus for vapour-cooling heat recovery in two steps, the first step is that liquid medium is heated in top sealing pipeline; Second step:Heated liquid medium is still heated vaporization in side wall and bottom again.Now, by different space reclamations Heat, improves overall heat recovery rate.
The course of work of this liquid slag waste-heat recovery device is as follows:Agitator 2 is inserted into the liquid level of low-melting-point metal liquid 6 After lower certain depth, starting agitator 2 makes its blade rotary motion, so as to drive the rotational flow of low-melting-point metal liquid 6.High temperature Liquid slag flows out from the slag ladle 1 toppled over, and is flowed into recuperation of heat pond 3 by cinder notch 12 through on the top cover of recuperation of heat pond 3, exposed with liquid level Low-melting-point metal liquid 6 be fully contacted mixing, and the solid-state that component is glassy state is quickly cooled into by low-melting-point metal liquid 6 Slag.Solid slag flows with low-melting-point metal liquid 6, is moved to pool wall under the influence of centrifugal force.Solid slag and low-melting-point metal After liquid 6 is separated, float and enter scum layer 7.Mop 11 stops that scum layer 7 travels forward, and it is attached that scum silica frost is gathered in into slag-draining device 4 Closely, and mop 11 opposite side formed liquid level it is exposed by slag region.
In addition, bottom blowing stirring device 8 sprays into low-melting-point metal liquid 6 inert gas from the bottom in recuperation of heat pond 3, to low Melting point metals liquid 6 produces mixing effect.The indifferent gas that the top blowing device 10 and bottom blowing stirring device 8 in recuperation of heat pond 3 are sprayed into Body, forms inert gas shielding atmosphere, it is to avoid low-melting-point metal liquid 6 and air in the upper space of the liquid level of low-melting-point metal liquid 6 Contact and be oxidized.Apparatus for vapour-cooling 5 is arranged in top, surrounding and the bottom in recuperation of heat pond 3, and control liquid medium elder generation Flowed through from the top in recuperation of heat pond 3, scum layer 7, pool wall, low-melting-point metal liquid 6 pass through convection current by radiant heat transfer, inert gas Heat transfer and heat transfer by heat conduction carry out first time heating to liquid medium, and heated liquid medium again passes through the side in recuperation of heat pond 3 Wall and bottom are heated to form steam.Meanwhile, the inert gas after cooling is through the discharge recuperation of heat of exhaust outlet 9 pond 3.Between slag-draining device 4 Break or work continuously and scum silica frost is discharged recuperation of heat pond 3 in time.
Procedure below is completed in recuperation of heat pond 3:
1st, mix:Under the collective effect of high-temperature molten slag itself kinetic energy and the flow field of low-melting-point metal liquid 6, liquid slag with Low-melting-point metal liquid 6 is sufficiently mixed.
2nd, stir:Mechanical stirring device or/and inertia stirring gas are done work to low-melting-point metal liquid 6, different parts it is low The existing speed difference of melting point metals liquid outflow, produces mixing effect.
3rd, exchange heat:Liquid slag is sufficiently mixed with low-melting-point metal liquid 6, is in close contact, and the heat transfer energy of low-melting-point metal liquid 6 Power is strong, is capable of achieving rapid heat exchange, produces the effect of chilling liquid slag, it is ensured that the liquid slag after treatment obtains high-vitrification rate.
4th, float:The proportion of liquid slag is less than low-melting-point metal liquid 6, therefore, intersperse among the solid-state in low-melting-point metal liquid 6 Slag is in buoyancy float downward, while also easily being captured by ascending gas bubbles and bringing slag blanket into.
5th, separate:Low-melting-point metal liquid 6 is big with the angle of wetting of solid slag, therefore, be therebetween not in infiltration phenomenon, Under gravity, both are automatically separated.
The preferred embodiments of the present invention are these are only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair The equivalent structure transformation that bright specification and accompanying drawing content are made, or other related technical fields are directly or indirectly used in, Similarly it is included within the scope of the present invention.

Claims (3)

1. a kind of method of liquid slag waste heat recovery, it is characterised in that comprise the following steps:
By in the liquid slag injection recuperation of heat pond of high temperature, the liquid slag is same with what the low-melting-point metal liquid in recuperation of heat pond mixed When be cooled rapidly into solid-state slag, wherein, low-melting-point metal be fusing point in 500 DEG C and following metal or alloy, it is described molten Melt the high-temperature molten slag that slag is produced for iron and steel industry or nonferrous metallurgy;
Liquid slag realizes that heat is quickly transmitted with low-melting-point metal liquid, while solid-state slag floats to form scum layer, scum silica frost interruption Or continuous discharge;
The heat that the apparatus for vapour-cooling set in recuperation of heat pond absorbs low-melting-point metal liquid makes its liquid vapour in sealing pipeline Change, the steam of formation is for recycling;
Wherein, the low-melting-point metal liquid is stirred using mechanical agitation and/or inertia gases at high pressure, makes liquid slag with low melting point gold The heat for belonging to liquid is quickly transmitted, and promotes recuperation of heat pond temperature uniform.
2. the method for liquid slag waste heat recovery as claimed in claim 1, it is characterised in that be blown to low-melting-point metal liquid surface Inert gas is protecting low-melting-point metal liquid not oxidation by air.
3. the method for liquid slag waste heat recovery as claimed in claim 1 or 2, it is characterised in that the sealing of apparatus for vapour-cooling Pipeline is distributed in top, madial wall and the bottom in recuperation of heat pond, and liquid medium is first heated through the sealing pipeline at top, by interior The sealing pipeline of side wall and bottom is heated to form steam.
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CN106767004B (en) * 2016-12-27 2019-04-19 中冶南方工程技术有限公司 The heat recovering device and method of melted material
CN108278904B (en) * 2017-01-05 2020-10-30 北京金熔节能环保科技有限公司 High-temperature smelting slag waste heat recovery device and method
CN108611453A (en) * 2018-04-26 2018-10-02 南京华电节能环保设备有限公司 A kind of device and method of recycling high-temperature slag heat
CN108870350B (en) * 2018-07-19 2021-03-05 北京金熔节能环保科技有限公司 Tunnel type high-temperature slag waste heat dry-method recovery device and method
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JPS59221588A (en) * 1983-05-31 1984-12-13 住友金属工業株式会社 Method and device for manufacturing quenched solidified slag
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