CN105154606A - Blast furnace slag space atomization water quenching and high-temperature water quenching slag waste heat power generating method - Google Patents
Blast furnace slag space atomization water quenching and high-temperature water quenching slag waste heat power generating method Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a blast furnace slag space atomization water quenching and high-temperature water quenching slag waste heat power generating method. The method comprises the following steps: liquid blast furnace slag is dispersed into small liquid drops; the small liquid drops meet atomized water drops dispersed in space when falling and space water quenching is generated; latent heat of liquid slag is transferred into latent heat of water to form solid particle blast furnace slag; water forms saturated steam; the saturated steam and the solid particle blast furnace slag exchange heat on a vibration bed to form low super-heat steam to be used as a fluidization medium of a fluidized bed; the solid particle blast furnace slag is cooled till the temperature reaches 900 DEG C, and is fed into a superheater fluidized bed, an evaporator fluidized bed and a low-temperature superheater fluidized bed for heat release, so as to respectively provide superheating heat, evaporation heat and preheating heat for an acting working medium; the solid particle blast furnace slag finally forms a blast furnace slag product; a high-temperature fluidization medium generated by the superheater fluidized bed enters a fluidization vapor heat exchanger to change heat with working mediums in a high-temperature economizer and a condensed water preheater, and finally, is condensed into blast furnace slag water quenching water for recycling. According to the method, the recycling rate of blast furnace slag waste heat can be greatly increased.
Description
Technical field
The present invention relates to one and first carry out space shrend with atomized water to blast furnace slag, the method for recycling Water Quenching Slag high-temperature residual heat generating, the atomization shrend of especially a kind of blast furnace slag space and high-temperature water quenching slag method for power generation by waste heat, belong to cogeneration technology field.
Background technology
Blast-furnace slag is topmost waste in Iron And Steel Industry, often produce one ton of pig iron and about produce 300kg blast-furnace slag, its tapping temperature is at 1400-1500 DEG C, latent heat and sensible heat belong to high-quality residual heat resources, recycle the waste heat of blast-furnace slag to iron industry energy-saving and emission-reduction, improve secondary energy efficiency most important, but there is no ripe recovery technology efficiently at present, cause a large amount of blast furnace slag waste heat to dissipate in vain.
At present; the treatment process that blast furnace slag generally adopts is water quenching granulating method; graining steel slag is typically used as cement raw material; this Application way well achieves the resource utilization recycling of solid waste; but blast furnace slag waste heat all shifts in the washing slag water entering 70 DEG C-90 DEG C after blast furnace water quenching; because washing slag water temperature is too low, the recycling of washing slag water heat energy is only limitted to using exhaust heat of slag flushing water heating or bathroom supplying hot water.Utilize using exhaust heat of slag flushing water to heat and be also subject to the restriction of region and time, especially in those southern areas without warming installation, this part energy can only be wasted, and waste heat is not used.Even if using exhaust heat of slag flushing water is used for heating or bathroom supplying hot water, waste heat recovery rate is also only about 10%.
In known water-quenched blast-furnace slag technique, wherein the washing slag water of about 15% can become water vapor by evaporation endothermic, the huge energy that these steam carry, it diffuses the waste not only causing energy, also make a large amount of water be lost to the external world simultaneously, water vapour contains a large amount of objectionable impurities, serious environment pollution simultaneously.
Summary of the invention
The present invention is intended to solve above-mentioned defect existing in the process of known water-quenched blast-furnace slag art breading blast furnace slag, there is provided a kind of and first with atomized water, space shrend is carried out to blast furnace slag, the method of recycling Water Quenching Slag high-temperature residual heat generating, increase substantially the blast furnace slag waste heat rate of recovery, and blast furnace slag waste heat is converted into high-grade electric energy, can great lot of water resources be saved and the discharge of decreasing pollution thing simultaneously.
The technical solution used in the present invention is:
The atomization shrend of a kind of blast furnace slag space and high-temperature water quenching slag method for power generation by waste heat, undertaken by following technical process:
(1) first liquid blast furnace is separated into the scum drop of small particle size through rotary drum effect, meet with the water droplets being distributed in water quenching chamber space in small particle size scum droplets fall process, be that small solid particles solidifies heat release in space shrend, straying quatity by controlling atomized water during shrend controls scum drop and releases the cooling extent after the latent heat of condensation, makes the particle scum temperature fallen on vibrating bed be 900 DEG C;
(2) solid particles scum fall there is certain angle of inclination vibrating bed on, move forward under the effect of vibrating bed, the final fluidized-bed heat release entering rear portion successively, simultaneously, it is the low overheat shrend steam of 150 DEG C that the saturation steam that space shrend produces is passed down through solid particles scum layer formation temperature on vibrating bed under the draft effect of induced draft fan, and this shrend steam enters the fluidizing medium of bottom air compartment as fluidized-bed of fluidized-bed;
(3) the solid particles scum on vibrating bed is cooled to 800 DEG C and enters superheater fluidized-bed, low temperature superheater and the high temperature superheater pipe laying of waste heat boiler is provided with in superheater fluidized-bed, high-temperature particle scum is cooled to 580 DEG C to steam heat release and enters vaporizer fluidized-bed, steam is superheated to 450 DEG C by temperature of saturation, then enter steam turbine power generation, fluidizing medium and the rear high temperature heat-carrying matter water vapour formed of shrend steam heat absorption enter the heat release of heat-carrying matter vapor heat exchanger;
(4) the vaporizer pipe laying of waste heat boiler is provided with in vaporizer fluidized-bed, 250 DEG C are cooled to saturation water heat release after 580 DEG C of particle scums enter vaporizer fluidized-bed, then enter low-level (stack-gas) economizer fluidized-bed, heat up after fluidization steam vapor heat absorption, again enter superheater fluidized-bed as fluidizing medium;
(5) temperature leaving vaporizer fluidized-bed is that the particle scum of about 250 DEG C enters low-level (stack-gas) economizer fluidized-bed, and low-level (stack-gas) economizer fluidized-bed is provided with low-level (stack-gas) economizer pipe laying, and the heat release of particle scum is cooled to 180 DEG C and sends into finished product stockpiles;
(6) 450 DEG C of high temperature heat-carrying matter steam leave superheater fluidized-bed laggard enter fluidisation vapor heat exchanger, first 150 DEG C are cooled to the water heat exchange in high-temperature economizer, then enter condensed water preheater condensation heat and form shrend water, after shrend water precipitation, add the atomized water recycle that alkali lye is re-used as atomization shrend.
Adopt the present invention of technique scheme, compared with prior art, its beneficial effect is:
1. solve blast furnace slag waste heat and utilize the problem by region, period limitation: blast furnace slag waste heat is transferred in 450 DEG C and presses through in hot steam by the present invention, and generate electricity, this kind of residual-heat utilization method, not by region, the limitation of period, can all iron and steel enterprises be promoted at home.
2. the problem that waste heat recovery rate is low is solved: blast furnace slag waste heat is used for generating electricity by the present invention, and can realize cogeneration when winter, waste heat recovery rate increases substantially.
3. the problem that waste heat product bit-loss is large is solved: in the present invention, heat energy is transferred in the superheated vapour of 450 DEG C by the high temperature blast furnace slag of 1400-1500 DEG C, compared with known blast furnace water quenching method, heat quality reduces amplitude and reduces a lot, and rate of loss is reduced to 32%.Blast furnace slag waste heat is used for producing the highest higher-grade electric energy of energy level by the present invention, and technique advance increases substantially.
4. the problem that shrend steam does not add utilization is solved: the present invention, with the thermal source of shrend steam as heat-carrying matter and waste heat boiler, avoids a large amount of water vapour and diffuses in vain, also save corresponding water resources.
5. the problem that water resource waste is serious is solved: the present invention is with the thermal source of shrend steam as heat-carrying matter and waste heat boiler, the condensation heat release in waste heat boiler of shrend steam condenses into reuse again after water, considerably reduce the water resources spent by blast furnace slag treating processes, water resources saving rate is up to more than 90%.
6. solve the problem of noxious gas emission: the present invention adopts alkaline water as shrend medium, the absorption agent of shrend medium inherently obnoxious flavour, moreover shrend medium circulation utilizes, and does not almost have the discharge of the sour gas such as hydrogen sulfide and sulfurous gas.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention;
In figure: 1-shaking device; 2-rotary drum; 3-liquid blast furnace pond; 4-liquid blast furnace; 5-high-efficiency atomizing nozzle; The 6-high-temperature solid particle scum bed of material; 7-vibrating bed; 8-superheater fluidized-bed; 9-superheater fluidized-bed material blanking tube; 10-low temperature superheater pipe laying; 11-high temperature superheater pipe laying; 12-desuperheater; 13-drum; 14-superheater fluidized-bed external separator; 15-fluidization steam vapor interchanger; 16-high-temperature economizer; 17-steam turbine condensed water preheater; 18-precipitation and alkali lye pond; 19-is atomized water pump; 20-steam turbine; 21-condenser; 22-generator; 23-cooling tower; 24-condensate pump; 25-low-level (stack-gas) economizer fluidized-bed separator; 26-deoxygenator; 27-deoxygenation water pump; 28-low-level (stack-gas) economizer; 29-blast furnace slag product; 30-low-level (stack-gas) economizer fluidized-bed; 31-low-level (stack-gas) economizer feed bin; 32-chapelet; 33-spiral conveyer; 34-vaporizer; 35-vaporizer fluidized-bed; 36-fluidized air blower.
Embodiment
Below in conjunction with embodiment, the present invention is further elaborated, but the present embodiment does not form any restriction to the present invention.
The blast furnace slag space atomization shrend that the present embodiment provides and high-temperature water quenching slag method for power generation by waste heat, see Fig. 1, undertaken by following technical process:
(1) liquid blast furnace solidifying, granulating and shrend steam micro-overheating flow process in water quenching chamber:
The liquid blast furnace 4 being contained in liquid blast furnace pond 3 relies on gravity to fall on the rotary drum 2 of high speed rotating, and liquid blast furnace 4 throws away under the effect of rotary drum 2 centrifugal force, and forms tiny liquid iron solid impurity particle;
To quench indoor at liquid iron pulp water, with high-efficiency atomizing nozzle 5, alkaline water is atomized into the water smoke of fine particle, after liquid blast furnace 4 is separated into small droplets in water quenching chamber, meet with the water droplets being distributed in space and shrend occur in limit, whereabouts, limit, latent heat and a small amount of sensible heat is discharged in liquid blast furnace 4 shrend process, form the solid particles scum of about 900 DEG C, liquid blast furnace 4 shrend liberated heat is used for atomized water to be heated into saturated vapor;
The solid particles scum of about 900 DEG C drops on vibrating bed 7, form the high-temperature solid particle scum bed of material 6, and move forward under the effect of vibrating bed 7, the vibrations of vibrating bed 7 are occurred by shaking device 1, solid particles scum is cooled to about 800 DEG C, then enters the interchanger at rear portion and the heat exchange of acting working medium successively;
The saturation steam that space shrend produces is under the draft effect of fluidized air blower 36, be passed down through the high-temperature solid particle scum bed of material 6 on vibrating bed 7, form the low overheat shrend steam (temperature is about 150 DEG C) with certain superheating temperature, and enter the bottom air compartment of vaporizer fluidized-bed 35 and low-level (stack-gas) economizer fluidized-bed 30, as the fluidised fluidizing medium of space atomization water-quenched blast-furnace slag.
(2) shrend particle scum heat recovery scheme:
After shrend particle scum leaves vibrating bed 7, after three grades of fluidized-beds (superheater fluidized-bed 8, vaporizer fluidized-bed 35, low-level (stack-gas) economizer fluidized-bed 30) heat release, the final blast furnace slag product 29 forming low temperature.Wherein:
(1) heat transfer process of shrend particle scum in superheater fluidized-bed 8:
The high-temperature water quenching particle scum of about 800 DEG C enters in superheater fluidized-bed 8 by vibrating bed 7, at fluidization steam vapor (carrying out the blast furnace water quenching steam of about 300 DEG C of flash-pot fluidized-bed 35) flows by action, in superheater fluidized-bed 8, be provided with low temperature superheater pipe laying 10, high temperature superheater pipe laying 11, desuperheater 12 is set between low temperature superheater pipe laying 10 and high temperature superheater pipe laying 11; Superheater fluidized-bed 8 bed temperature maintains about 580 DEG C, and saturation steam, to steam heat release, is heated to be the superheated vapour of 450 DEG C by high-temperature water quenching particle scum, and superheated vapour enters steam turbine power generation 20; About 580 DEG C high-temperature water quenching particle scums are dropped down onto in vaporizer fluidized-bed 35 by superheater fluidized-bed 9 material blanking tube and continue heat release; Simultaneously, high-temperature water quenching particle scum is also to fluidization steam vapor heat release, fluidization steam vapor temperature is brought up to 450 DEG C by 300 DEG C, the fluidization steam vapor of 450 DEG C enters superheater fluidized-bed 14 external separator and carries out gas solid separation dedusting, clean fluidization steam vapor enters fluidization steam vapor interchanger 15 heat exchange, and dedusting ash enters low-level (stack-gas) economizer feed bin 31.
(2) heat transfer process of shrend particle scum in vaporizer fluidized-bed 35:
After the shrend particle scum of about 580 DEG C enters vaporizer fluidized-bed 35, under the effect of 150 DEG C of micro-overheated shrend steam from vibrating bed 7 bottom, enter fluidized state, bed temperature maintains about 250 DEG C; Vaporizer fluidized-bed 35 is furnished with vaporizer 34, and shrend particle scum provides vaporization heat to saturation water, and saturation water is evaporated to saturation steam, and saturation steam enters drum 13; Meanwhile, its temperature, to the heat release of 150 DEG C of micro-overheated shrend steam, is increased to about 300 DEG C by shrend particle scum, and then, the shrend steam of about 300 DEG C enters superheater fluidized-bed 8 as the fluidizing medium of superheater fluidized-bed 8; 250 DEG C of shrend particle scums in spiral conveyer 33, then are delivered to chapelet 32 bottom by spiral conveyer 33 by vaporizer fluidized-bed 35 discharge, are promoted to low-level (stack-gas) economizer feed bin 31 by chapelet 32.
(3) heat transfer process of shrend particle scum in low-level (stack-gas) economizer fluidized-bed 30:
After the shrend particle scum of 250 DEG C enters low-level (stack-gas) economizer fluidized-bed 30 by low-level (stack-gas) economizer feed bin 31, under the effect of the micro-overheated shrend steam from fluidized air blower 36, enter fluidized state, bed temperature maintains about 180 DEG C; Low-level (stack-gas) economizer fluidized-bed 30 is provided with low-level (stack-gas) economizer pipe laying 28, and feedwater, to oiler feed heat release, is heated to about 145 DEG C by particle scum, and particle scum is cooled to 180 DEG C and forms blast furnace slag product 29; Simultaneously, shrend particle scum is to the heat release of 150 DEG C of micro-overheated shrend steam, its temperature is increased to about 165 DEG C, the shrend steam of about 165 DEG C enters the dedusting of low-level (stack-gas) economizer fluidized-bed separator 25, clean fluidization steam vapor enters superheater fluidized-bed 8 and low-level (stack-gas) economizer fluidized-bed 30 as fluidizing medium together with overheated shrend steam micro-with 150 DEG C again, and the dedusting ash of low-level (stack-gas) economizer fluidized-bed separator 25 dedusting forms blast furnace slag product 29.
(4) heat transfer process of fluidization steam vapor interchanger 15:
High temperature fluidized steam (450 DEG C) from superheater fluidized-bed 8 enters fluidization steam vapor interchanger 15, then sequentially passes through waste heat boiler high-temperature economizer 16, steam turbine condensed water preheater 17 carries out heat exchange; Fluidization steam vapor in waste heat boiler high-temperature economizer 16 to acting working medium heat release, acting working medium is heated to the temperature levels of lower than temperature of saturation 10 DEG C by 104 DEG C, fluidization steam vapor is cooled to 125 DEG C, then heat exchange in steam turbine condensed water preheater 17 is entered, fluidization steam vapor makes it be warming up to close to deoxygenator working temperature to the heat release of steam turbine condensed water, fluidization steam vapor then condenses into water at steam turbine condensed water preheater 17 outside surface, and collect precipitation and alkali lye pond 18 in precipitation, add alkali, then pressurizeed, again as the recycle of shrend atomized water by atomization water pump 19.
(3) heat-carrying gas workflow:
Shrend atomized water is atomized as little water droplet disperse is in water quenching chamber space through high-efficiency atomizing nozzle 5, the evaporation of absorbing heat after running into liquid blast furnace drop of little water droplet becomes saturation steam, shrend saturation steam becomes micro-superheated vapour through vibrating bed 7 under induced draft fan effect, micro-superheated vapour enters as vaporizer fluidized-bed 35 together with the heat-carrying vapor mixing from low-level (stack-gas) economizer fluidized-bed 30, the fluidizing medium of low-level (stack-gas) economizer fluidized-bed 30 enters vaporizer fluidized-bed 35, the fluidizing medium that the fluidization steam vapor leaving vaporizer fluidized-bed 35 then enters as superheater fluidized-bed 8 enters superheater fluidized-bed 8, the high temperature fluidized steam leaving superheater fluidized-bed 8 enters fluidization steam vapor interchanger 15, fluidizing medium condensed water is condensed in fluidization steam vapor interchanger 15, and collect in precipitation and alkali lye pond 18, fluidizing medium condensed water is precipitation in precipitation and alkali lye pond 18, alkaline purification, form clean shrend to quench atomized water recycle.
(4) acting working medium workflow:
The low-level (stack-gas) economizer 28 of oiler feed through being arranged in low-level (stack-gas) economizer fluidized-bed 30, the high-temperature economizer 16 be arranged in fluidization steam vapor interchanger 15 enters drum 13, saturation water in drum 13 enters by downtake the vaporizer 34 be arranged in vaporizer fluidized-bed 35 and flashes to saturation steam, saturation steam enters drum 13 and carries out carbonated drink separation, saturation steam enters the height being arranged in superheated vapour fluidisation bed 8, low temperature superheater forms middle pressure, middle temperature main steam, main steam enters steam turbine 20 and does work, drive electrical generators 22 generates electricity, exhaust steam is become after main steam acting, exhaust steam enters condenser 21 and condenses into steam turbine condensed water, the heat-absorbing medium of exhaust steam condensation enters cooling tower 23 and cools, steam turbine condensed water enters steam turbine condensed water preheater 17, then deoxygenator 26 deoxygenation is entered, deaerated water enters low-level (stack-gas) economizer 28 again through service pump pressurization, start next power cycle.
The foregoing is only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention, the equivalence change that all utilizations description of the present invention is done, be all contained within interest field of the present invention.
Claims (1)
1. the atomization shrend of blast furnace slag space and a high-temperature water quenching slag method for power generation by waste heat, is characterized in that, undertaken by following technical process:
(1) first liquid blast furnace is separated into the scum drop of small particle size through rotary drum effect, meet with the water droplets being distributed in water quenching chamber space in small particle size scum droplets fall process, be that small solid particles solidifies heat release in space shrend, straying quatity by controlling atomized water during shrend controls scum drop and releases the cooling extent after the latent heat of condensation, makes the particle scum temperature fallen on vibrating bed be 900 DEG C;
(2) solid particles scum fall there is certain angle of inclination vibrating bed on, move forward under the effect of vibrating bed, the final fluidized-bed heat release entering rear portion successively, simultaneously, it is the low overheat shrend steam of 150 DEG C that the saturation steam that space shrend produces is passed down through solid particles scum layer formation temperature on vibrating bed under the draft effect of induced draft fan, and this shrend steam enters the fluidizing medium of bottom air compartment as fluidized-bed of fluidized-bed;
(3) the solid particles scum on vibrating bed is cooled to 800 DEG C and enters superheater fluidized-bed, low temperature superheater and the high temperature superheater pipe laying of waste heat boiler is provided with in superheater fluidized-bed, high-temperature particle scum is cooled to 580 DEG C to steam heat release and enters vaporizer fluidized-bed, steam is superheated to 450 DEG C by temperature of saturation, then enter steam turbine power generation, fluidizing medium and the rear high temperature heat-carrying matter water vapour formed of shrend steam heat absorption enter the heat release of heat-carrying matter vapor heat exchanger;
(4) the vaporizer pipe laying of waste heat boiler is provided with in vaporizer fluidized-bed, 250 DEG C are cooled to saturation water heat release after 580 DEG C of particle scums enter vaporizer fluidized-bed, then enter low-level (stack-gas) economizer fluidized-bed, heat up after fluidization steam vapor heat absorption, again enter superheater fluidized-bed as fluidizing medium;
(5) temperature leaving vaporizer fluidized-bed is that the particle scum of about 250 DEG C enters low-level (stack-gas) economizer fluidized-bed, and low-level (stack-gas) economizer fluidized-bed is provided with low-level (stack-gas) economizer pipe laying, and the heat release of particle scum is cooled to 180 DEG C and sends into finished product stockpiles;
(6) 450 DEG C of high temperature heat-carrying matter steam leave superheater fluidized-bed laggard enter fluidisation vapor heat exchanger, first 150 DEG C are cooled to the water heat exchange in high-temperature economizer, then enter condensed water preheater condensation heat and form shrend water, after shrend water precipitation, add the atomized water recycle that alkali lye is re-used as atomization shrend.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106435067A (en) * | 2016-12-15 | 2017-02-22 | 大冶市环宇钙业科技有限公司 | Efficient energy-saving stable type steel slag pyrolyzer |
| CN106996551A (en) * | 2017-05-18 | 2017-08-01 | 华北理工大学 | A kind of many step bed temperature bubbling bed heat-exchanger rigs of staged |
| CN109595947A (en) * | 2019-01-17 | 2019-04-09 | 苏州良造能源科技有限公司 | A kind of industrial slags cement sensible heat recovery system and its recovery method |
| CN112226554A (en) * | 2020-10-26 | 2021-01-15 | 上海驰春节能科技有限公司 | Novel exhaust-heat boiler of high-temperature liquid slag of granulated steel |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106435067A (en) * | 2016-12-15 | 2017-02-22 | 大冶市环宇钙业科技有限公司 | Efficient energy-saving stable type steel slag pyrolyzer |
| CN106435067B (en) * | 2016-12-15 | 2018-06-29 | 大冶市环宇钙业科技有限公司 | A kind of energy-efficient stable type steel slag cracking furnace |
| CN106996551A (en) * | 2017-05-18 | 2017-08-01 | 华北理工大学 | A kind of many step bed temperature bubbling bed heat-exchanger rigs of staged |
| CN109595947A (en) * | 2019-01-17 | 2019-04-09 | 苏州良造能源科技有限公司 | A kind of industrial slags cement sensible heat recovery system and its recovery method |
| CN109595947B (en) * | 2019-01-17 | 2023-10-03 | 苏州良造能源科技有限公司 | Industrial slag sensible heat recovery system and recovery method thereof |
| CN112226554A (en) * | 2020-10-26 | 2021-01-15 | 上海驰春节能科技有限公司 | Novel exhaust-heat boiler of high-temperature liquid slag of granulated steel |
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