CN103557711A - Molten slag rapid cooling, granulation and waste heat recovery power generation system and method - Google Patents

Molten slag rapid cooling, granulation and waste heat recovery power generation system and method Download PDF

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CN103557711A
CN103557711A CN201310542399.1A CN201310542399A CN103557711A CN 103557711 A CN103557711 A CN 103557711A CN 201310542399 A CN201310542399 A CN 201310542399A CN 103557711 A CN103557711 A CN 103557711A
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slag
granulation
heat carrier
cooler
entrance
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CN103557711B (en
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刘亚雷
宋纪元
侯宾才
方明
陈国宇
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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Abstract

The invention provides a molten slag rapid cooling, granulation and waste heat recovery power generation system and method, and belongs to the technical field of ferrous metallurgy molten slag processing and waste energy recovery. The molten slag rapid cooling, granulation and waste heat recovery power generation system comprises a slag receiving device, a heat carrier slag rapid cooling and granulation device, a slag slow-cooling device, a waste heat recovery power generation device and a waste gas purification treatment device. The molten slag is rapidly cooled and granulated by the heat carrier slag rapid cooling and granulation device, and is rapidly cooled to a glass body state; the molten slag is further cooled slowly by heat exchange to facilitate the follow-up sensitive heat recovery. According to the system and the method, the rapid cooling and granulation of molten slag are effectively realized, and the high-temperature waste heat resource is fully recycled on the basis of unaffecting the water activity of the slag.

Description

Molten slag chilling granulation and waste heat recovery generating system and method thereof
Technical field
The invention belongs to Ferrous Metallurgy slag treatment and complementary energy recovery technology field, particularly relate to a kind of molten slag chilling granulation and waste heat recovery generating system and method thereof.
Background technology
In smelting iron and steel production process, can produce a large amount of smelting high temperature furnace slags.By iron and steel enterprise's statistics, learnt, blast furnace slag accounts for 50% left and right of steel and iron industry solid waste, and is well behaved silicate material, by after processing, can be used as the raw material of producing cement.
The technique of blast furnace slag waste heat recovery mainly contains two kinds of wet processing and dry process.Wet processing refers to water under high pressure and makes the cooling technique of high temperature furnace slag, generally also referred to as water quenching technology, obtains the grain slag of grains of sand shape after shrend, and the overwhelming majority is amorphous state, is good cement raw material.Dry process relies on pressure-air or additive method to realize that high temperature furnace slag is cooling, the technique of granulation.The domestic research in dry granulation technology is at the early-stage; as Qingdao Technological University, iron and steel research institute etc. has carried out theory and experimental study work to centrifugal granulation method; but it is less to test slag flow used; larger with slag difference in flow distance in production reality, and the heat recovery work of slag particle after granulation is not studied.
Present stage, domestic smelter all adopts water quenching technology to process for high temperature furnace slag.In Water Quenching Slag treatment system, grain slag ratio is in (8~15): 1, the heat that blast furnace slag is taken away accounts for 16% left and right of blast furnace total energy consumption, what through various Water Quenching technique, reclaim is only 10% of slag total amount of heat, all the other heats become water vapour and put into atmosphere, cause the significant wastage of resource, in the process of shrend simultaneously, can produce a large amount of gaseous sulphide SO 2and H 2s, has also caused pollution to atmosphere.
At present, the waste heat of molten slag is unique high-temperature residual heat resource not being used effectively in iron and steel enterprise.Therefore reclaim metallurgy melting afterheat of slags efficient, high-qualityly and will become an important means of iron and steel enterprise's reduction comprehensive energy consumption.
Summary of the invention
Deficiency for existing slag treatment technology; according to the requirement of molten slag quenching dry type granulation and the characteristic of slag; the invention provides a kind of molten slag chilling granulation and waste heat recovery generating system, to reach the object of effective chilling granulation molten slag and recovery high-temperature residual heat resource.Another object of the present invention is to provide the electricity-generating method of this system.
For achieving the above object, the technical scheme that electricity generation system of the present invention adopts is as follows:
Molten slag chilling granulation and waste heat recovery generating system, comprise and connect slag device, heat carrier slag chilling granulating device, slag annealing device, waste heat recovery generating device and exhaust gas purification and treatment device,
The described slag device that connects is by connecing slag ladle and slag ladle forms;
Described heat carrier slag chilling granulating device comprises heat carrier storage tank, heat carrier circulating pump, granulation stove and slag liquid/gas separator; Described granulation stove is provided with granulation nozzle and cooling jet; Granulation stove is connected with slag liquid/gas separator by the second chute, and slag liquid/gas separator is connected with heat carrier storage tank, and heat carrier storage tank is connected respectively to granulation nozzle and cooling jet by heat carrier circulating pump;
Described slag annealing device comprises cooler, uses water-cooled vibrating grate in cooler; The slag entrance of described cooler is connected with described slag liquid/gas separator by slag guiding gutter, and the cooling air intake of cooler is connected with air blast; Before the lingering remnants of past customs mouth of described cooler, be provided with windbreak, the afterbody of cooler is provided with dregs breaking device;
Described waste heat recovery generating device comprises wet steamer, drum, superheater, steam turbine, generator, condenser, cooling tower and thermal deaerator; The middle temperature waste heat suction opeing of described cooler is connected with wet steamer entrance by airduct; Described wet steamer comprises evaporimeter and economizer, and the entrance and exit of evaporimeter is all connected to drum, and the outlet of economizer is connected with drum, and described drum is connected to superheater; The heating medium outlet of described granulation stove is connected with superheater entrance by heat carrier pipeline, and superheater outlet is connected with heat carrier storage tank; The heating working medium of described superheater is high-temperature heat carrier; Described superheater is connected with the main inlet throttle-stop valve of steam turbine by main steam pipe, and described steam turbine is connected with generator; The exhaust steam outlet of described steam turbine is connected with condenser, and the hot well of condenser is connected with the entrance of condensate pump; The pond of described cooling tower is connected with circulating cooling water pump, and circulating cooling water pump is connected with the cooling water inlet of described condenser, and the coolant outlet of described condenser is connected with the top of cooling tower; Described condensate water delivery side of pump is connected with the entrance of thermal deaerator, and the pipe of boiler feedwater simultaneously is also connected with the entrance of described thermal deaerator, and the outlet of thermal deaerator is connected with the entrance of feed pump, and feedwater delivery side of pump is connected with the entrance of described economizer;
Described exhaust gas purification and treatment device comprises deduster, air-introduced machine and chimney, and the lingering remnants of past customs mouth of the exhaust opening of described wet steamer and cooler is connected with the entrance of deduster, and the outlet of deduster is connected with the entrance of air-introduced machine, and the outlet of air-introduced machine is connected with chimney.
The described appearance that connects slag ladle and slag ladle is all laid heat-insulating protective layer.
Further, in described heat carrier storage tank, be provided with electric heater; The material that heat carrier adopts is low-melting-point metal or metal alloy, as metallic tin etc.
The present invention utilizes the method for above-mentioned molten slag chilling granulation and waste heat recovery generating system, its concrete steps are as follows: the molten slag that blast furnace ironmaking produces is after scum separation, by described, connect slag ladle access and be transported to slag ladle, by the slag chute on slag ladle, slag is caused in granulation stove again, utilize granulation nozzle to pass through hot high pressure carrier by slag granulation chilling, and by cooling jet, the slag after granulation is further chilled to glassy state; By chute, the slag granules after chilling and part heat carrier are caused to slag liquid/gas separator again; By slag liquid/gas separator, slag granules is separated with part heat carrier, isolated part heat carrier is delivered to heat carrier storage tank by heat carrier pipeline, and isolated slag granules is dropped in water-cooled vibrating grate and utilized air blast to carry out Slow cooling by slag guiding gutter; Fully the cooled slag granules of heat exchange drops down onto feed bin at cooler afterbody after dregs breaking device is further processed, and finally by crossing chain conveyor, the slag of handling well is delivered to warehouse for finished product; Middle temperature waste gas is got air port from cooler and is sent into wet steamer and produced saturated vapor by airduct; The high-temperature heat carrier that granulation stove produces is sent into superheater by heat carrier pipeline, is used for the saturated vapor that overheated wet steamer sends here, and the superheated steam of generation is sent into steam turbine generator generating; After the waste gas that the lingering remnants of past customs of cooler is discharged with wet steamer mixes, after processing, deduster discharges by chimney.
Advantage of the present invention is as follows:
(1) with water quenching technology comparison, the present invention utilizes hot high pressure carrier to carry out granulation chilling to molten slag, can obtain the liquid heat carrier that temperature is higher in granulation phase, has improved the efficiency and the quality that reclaim sensible heat.
(2) with the wind technique comparison of quenching; the present invention utilizes hot high pressure carrier to carry out granulation chilling to molten slag, can effectively improve cooldown rate and intensity, can effectively reduce the volume of granulating device; and can obtain high-temperature liquid state heat carrier, improved the quality of recovery waste heat resource.
(3) waste heat recovery mode of the present invention is divided into chilling and two stages of slow cooling: in the slow cooling stage, utilize cooler can obtain middle temperature waste gas, then by wet steamer, produce saturated vapor; In the chilling stage, by hot high pressure carrier, slag is carried out to granulation chilling, can obtain the heat carrier of high temperature, the saturated vapor of then sending here by the overheated wet steamer of superheater, the step of having realized residual heat resources reclaims and utilizes.
Accompanying drawing explanation
Fig. 1 is molten slag chilling granulation of the present invention and waste heat recovery generating system flow chart;
In above-mentioned figure except the word of having indicated, 1-connects slag ladle, 2-molten slag, 3-slag ladle, 4-slag chute, 5-granulation stove, 5A-granulation nozzle, 5B-cooling jet, 6-chute, 7-slag liquid/gas separator, 8-slag guiding gutter, 9-cooler, 10-gets air port, 11-windbreak, 12-lingering remnants of past customs mouth, 13-dregs breaking device, 14-hopper, 15-air blast, 16-Water-cooling vibration grate, 17-chain-linked conveyer, 18-warehouse for finished product, 19-wet steamer, 19A-evaporimeter, 19B-economizer, 20-drum, 21-superheater, 22-heat carrier storage tank, 23-electric heater, 24-heat carrier circulating pump, 25-steam turbine, 26-generator, 27-condenser, 28-condensate pump, 29-circulating cooling water pump, 30-cooling tower, 31-oxygen-eliminating device, 32-feed pump, 33-deduster, 34-air-introduced machine, 35-chimney.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
As shown in Figure 1, molten slag chilling granulation of the present invention and waste heat recovery generating system, comprise and connect slag device, heat carrier slag chilling granulating device, slag annealing device, waste heat recovery generating device and exhaust gas purification and treatment device.
Connect slag device by connecing slag ladle 1 and slag ladle 3 forms, with outer insulation connect slag ladle 1 by the by-product high-temperature fusion slag access of discharging after blast furnace ironmaking, concentrate and converge to thering is the slag ladle 3 of outer insulation equally, to overcome the discontinuity of tap cinder.
Heat carrier slag chilling granulating device mainly comprises heat carrier storage tank 23, heat carrier circulating pump 24, granulation stove 5 and slag liquid/gas separator 7; Wherein in heat carrier storage tank, be provided with electric heater 23, granulation stove is provided with granulation nozzle 5A and cooling jet 5B.Heat carrier slag chilling granulating device utilizes heat carrier circulating pump, granulation nozzle 5A to form hot high pressure carrier, under the effect of cutting force, molten slag is broken into droplet, and with heat carrier heat exchange chilling; Then by cooling jet, the slag after granulation is further chilled to glassy state.
Slag annealing device mainly comprises cooler 9, uses water-cooled vibrating grate 16 in cooler; Slag guiding gutter 8 is connected with slag liquid/gas separator 7, and the cooling air intake of cooler 9 is connected with air blast 15; The afterbody of cooler 9 is provided with dregs breaking device 13.The slag of granulation is by after slag liquid/gas separator 7; isolated slag granules drops on for 8 times on cooler 9 by slag guiding gutter; cooling with the further heat exchange of cooling-air blasting from cooler 9 bottoms; vibration grate 16 can prevent bonding and the heat exchange between slag granules effectively, and abundant cooled slag is sent into warehouse for finished product 18 and stored after the further break process of dregs breaking device 13.In cooler 9, also windbreak 11 can be set, the waste gas of the relative low temperature of postmedian and front portion are separated, avoid high-temp waste gas directly to mix with it and cause the whole grade of waste heat to reduce.
Waste heat recovery generating device mainly comprises wet steamer 19, drum 20, superheater 21, steam turbine 25, generator 26, condenser 27, cooling tower 30 and thermal deaerator 31.Wet steamer comprises evaporimeter 19A and economizer 19B; The middle temperature waste heat suction opeing 10 of cooler is connected with wet steamer entrance by airduct; The heating medium outlet 5C of granulation stove is connected with superheater entrance by heat carrier pipeline.Middle temperature waste gas is got air port from cooler and is sent into wet steamer 19 and produced saturated vapor by airduct; The high-temperature heat carrier that granulation stove 5 produces is sent into superheater by heat carrier pipeline, is used for the saturated vapor that overheated wet steamer 19 sends here.The superheated steam that superheater 21 produces enters after steam turbine 25 expansion workings by main steam pipe, drains into condenser 27.Exhaust steam condenses into after water in condenser 27, imports hot well, then by condensate pump 28, is sent to thermal deaerator 31 deoxygenations, then through feed pump 32, pumps into boiler economizer 19B and recycle; Circulating cooling water pump 29 is squeezed into cooling water in pond after condenser 27, then is discharged into cooling tower 30 and carries out coolingly, through overcooled water, finally gets back to pool circulating utilization.
Exhaust gas purification and treatment device comprises deduster 33, air-introduced machine 34 and chimney 35, the lingering remnants of past customs mouth 12 of the exhaust opening of wet steamer 19 and cooler 9 is connected with the entrance of deduster 33, the outlet of deduster 33 is connected with the entrance of air-introduced machine 34, and the outlet of air-introduced machine 34 is connected with chimney 35.After the smoke evacuation of wet steamer 19 mixes with the afterbody lingering remnants of past customs of cooler 9, after deduster 33 is processed, by air-introduced machine 34, send into chimney 35 and enter atmosphere.
Molten slag chilling granulation of the present invention and waste heat recovery generating system: utilize unique granulating device by molten slag granulation chilling, then carry out Slow cooling by water-cooled vibrating grate; Middle temperature waste gas is got air port from cooler and is delivered to wet steamer by airduct, produces saturated vapor; The high-temperature heat carrier that granulation stove produces is sent into superheater by heat carrier pipeline, is used for the saturated vapor that overheated wet steamer sends here, and the superheated steam of generation is sent into steam turbine generator generating.

Claims (4)

1. molten slag chilling granulation and waste heat recovery generating system, comprise and connect slag device, heat carrier slag chilling granulating device, slag annealing device, waste heat recovery generating device and exhaust gas purification and treatment device, it is characterized in that:
The described slag device that connects is by connecing slag ladle (1) and slag ladle (3) forms;
Described heat carrier slag chilling granulating device comprises heat carrier storage tank (22), heat carrier circulating pump (24), granulation stove (5) and slag liquid/gas separator (7); Described granulation stove is provided with granulation nozzle (5A) and cooling jet (5B); Granulation stove (5) is connected with slag liquid/gas separator (7) by chute (6), slag liquid/gas separator (7) is connected with heat carrier storage tank (22), and heat carrier storage tank (22) is connected respectively to granulation nozzle (5A) and cooling jet (5B) by heat carrier circulating pump (24);
Described slag annealing device comprises cooler (9), uses water-cooled vibrating grate (16) in cooler; The slag entrance of described cooler is connected with described slag liquid/gas separator (7) by slag guiding gutter (8), and the cooling air intake of cooler is connected with air blast (15); Before the lingering remnants of past customs mouth of described cooler, be provided with windbreak (11), the afterbody of cooler is provided with dregs breaking device (13);
Described waste heat recovery generating device comprises wet steamer (19), drum (20), superheater (21), steam turbine (25), generator (26), condenser (27), cooling tower (30) and thermal deaerator (31); The middle temperature waste heat suction opeing (10) of described cooler is connected with wet steamer entrance by airduct; Described wet steamer comprises evaporimeter (19A) and economizer (19B), the entrance and exit of evaporimeter (19A) is all connected to drum (20), the outlet of economizer (19B) is connected with drum (20), and described drum (20) is connected to superheater (21); The heating medium outlet of described granulation stove (5C) is connected with superheater entrance by heat carrier pipeline, and superheater outlet is connected with heat carrier storage tank (22); The heating working medium of described superheater is high-temperature heat carrier; Described superheater (21) is connected with the main inlet throttle-stop valve of steam turbine by main steam pipe, and described steam turbine (25) is connected with generator (26); The exhaust steam outlet of described steam turbine is connected with condenser (27), and the hot well of condenser is connected with the entrance of condensate pump (28); The pond of described cooling tower is connected with circulating cooling water pump (29), and circulating cooling water pump (29) is connected with the cooling water inlet of described condenser, and the coolant outlet of described condenser is connected with the top of cooling tower; Described condensate water delivery side of pump is connected with the entrance of thermal deaerator, the pipe of boiler feedwater simultaneously is also connected with the entrance of described thermal deaerator, the outlet of thermal deaerator is connected with the entrance of feed pump (32), and the outlet of feed pump (32) is connected with the entrance of described economizer (19B);
Described exhaust gas purification and treatment device comprises deduster (33), air-introduced machine (34) and chimney (35), the lingering remnants of past customs mouth (12) of the exhaust opening of described wet steamer and cooler is connected with the entrance of deduster, the outlet of deduster is connected with the entrance of air-introduced machine, and the outlet of air-introduced machine is connected with chimney.
2. molten slag chilling granulation according to claim 1 and waste heat recovery generating system, is characterized in that, described in connect slag ladle and slag ladle appearance all lay heat-insulating protective layer.
3. molten slag chilling granulation according to claim 1 and 2 and waste heat recovery generating system, is characterized in that, is provided with electric heater (23) in described heat carrier storage tank (22); The material that described heat carrier adopts is low-melting-point metal or metal alloy.
4. utilize the electricity-generating method of molten slag chilling granulation as claimed in claim 1 and waste heat recovery generating system, it is characterized in that, concrete steps are as follows: the molten slag that blast furnace ironmaking produces is after scum separation, by described, connect slag ladle access and be transported to slag ladle, by the slag chute on slag ladle, slag is caused in granulation stove again, utilize granulation nozzle to pass through hot high pressure carrier by slag granulation chilling, and by cooling jet, the slag after granulation is further chilled to glassy state; By chute, the slag granules after chilling and part heat carrier are caused to slag liquid/gas separator again; By slag liquid/gas separator, slag granules is separated with part heat carrier, isolated part heat carrier is delivered to heat carrier storage tank by heat carrier pipeline, and isolated slag granules is dropped in water-cooled vibrating grate and utilized air blast to carry out Slow cooling by slag guiding gutter; Fully the cooled slag granules of heat exchange drops down onto feed bin at cooler afterbody after dregs breaking device is further processed, and finally by crossing chain conveyor, the slag of handling well is delivered to warehouse for finished product; Middle temperature waste gas is got air port from cooler and is sent into wet steamer and produced saturated vapor by airduct; The high-temperature heat carrier that granulation stove produces is sent into superheater by heat carrier pipeline, is used for the saturated vapor that overheated wet steamer sends here, and the superheated steam of generation is sent into steam turbine generator generating; After the waste gas that the lingering remnants of past customs of cooler is discharged with wet steamer mixes, after processing, deduster discharges by chimney.
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CN103882164A (en) * 2014-03-20 2014-06-25 陕西擎华新能源技术有限公司 System and method for recovering sensible heat of molten solids
CN103981306A (en) * 2014-05-25 2014-08-13 北京首钢国际工程技术有限公司 Method and device for recycling waste heat in molten slag water quenching and granulating process of ironmaking blast furnace
CN104975117A (en) * 2015-07-15 2015-10-14 南京凯盛开能环保能源有限公司 Blast furnace slag overall treatment and sensible heat recovery power generation system and method
CN105112577A (en) * 2015-09-30 2015-12-02 东北大学 Dry granulating blast furnace slag waste heat recovery device and blast furnace slag waste heat recovery method
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CN108302950A (en) * 2018-03-16 2018-07-20 南京有荣节能科技有限公司 A kind of afterheat of slags utilizes device
CN108796155A (en) * 2017-04-27 2018-11-13 天津汇金敏峰新材料科技有限公司 Energy-saving power generation system and power generation method for sensible heat recovery of slag and molten iron residues in blast furnace casting house
CN109539821A (en) * 2018-10-19 2019-03-29 天津大学 A kind of heat energy recycle method and device of high-temperature metallurgical slag
CN110117164A (en) * 2019-05-14 2019-08-13 中冶节能环保有限责任公司 A kind of device and method of pair of fusion smelting slag glass granulation and waste heat recycling
CN110195134A (en) * 2019-07-17 2019-09-03 赵健 A kind of metallurgical slag recyclable device
CN111394528A (en) * 2020-04-30 2020-07-10 安徽工业大学 A waste heat recovery system for high temperature liquid slag
CN111637446A (en) * 2020-06-09 2020-09-08 长沙有色冶金设计研究院有限公司 Melt fluidization cold shock device and application system and system application method thereof
CN112474706A (en) * 2020-10-28 2021-03-12 马钢集团设计研究院有限责任公司 Slag treatment system and method for molten state ash slag
CN115029488A (en) * 2022-06-27 2022-09-09 北京崎基环保科技有限公司 Steel slag treatment system and method for treating steel slag by using same
EP4112749A4 (en) * 2020-02-28 2023-12-27 Baoshan Iron & Steel Co., Ltd. DEVICE AND METHOD FOR GRANULATING AND WASTE HEAT RECOVERY AND USE OF BLASTH FURNACE SLAG

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