CN111719027A - Method for recovering high-grade heat energy of blast furnace slag - Google Patents
Method for recovering high-grade heat energy of blast furnace slag Download PDFInfo
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- CN111719027A CN111719027A CN202010408871.2A CN202010408871A CN111719027A CN 111719027 A CN111719027 A CN 111719027A CN 202010408871 A CN202010408871 A CN 202010408871A CN 111719027 A CN111719027 A CN 111719027A
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- slag
- iron
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method for recovering high-grade heat energy of blast furnace slag, which comprises the following steps: s1, treating the foam slag in front of the vanadium titano-magnetite furnace: shoveling a heat absorbing material into the large ditch for cooling, wherein the heat absorbing material absorbs heat in the main ditch and melts, so that the slag temperature is reduced, and the hidden danger that the foam slag overflows the ditch is eliminated; s2, smelting molten iron property by using schreyerite: further processing the blast furnace to obtain a production raw material for sintering or pelletizing; s3, treating the slag-iron mixture by utilizing sensible heat of the slag, and the method has the beneficial effects that: the method utilizes the high-grade heat value of the blast furnace slag, the temperature of the blast furnace slag is still higher than the melting point after the slag is utilized to partially sensible heat, the blast furnace slag is discharged from a slag runner in a liquid state, further heat energy development and utilization of the slag are not influenced, comprehensive utilization of internal resources in iron making is realized, secondary resources are reduced, repeated processing and transportation cost is reduced, foam slag is generated when the temperature of the slag is too high, the slag is cooled by using a slag-iron mixture, the formation of the foam slag can be successfully inhibited, and the sensible heat of the slag is recovered.
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a method for recovering high-grade heat energy of blast furnace slag.
Background
1. Sensible heat condition of blast furnace slag
A large amount of high-temperature furnace slag is generated in the blast furnace ironmaking process, the blast furnace slag has a large amount of sensible heat, the vanadium-titanium magnetite ore smelting grade is lower, the slag amount is large, Chuanwei belongs to medium titanium slag smelting, the slag ratio is about 460kg/t.Fe, the enthalpy of the slag is calculated according to 430kcal/kg, and the sensible heat of the slag generated when one ton of pig iron is smelted is as follows: 460 × 430 — 179800Kcal, because the main components of the blast furnace slag are CaO, SiO2, MgO, TiO2, etc., and the chemical components and structures before and after the generation are not changed, the enthalpy of the blast furnace slag can be calculated as sensible heat, the sensible heat of the blast furnace slag can be converted into standard coal amount by considering 7000Kcal/kg as the standard coal, and 523 ten thousand tons of iron produced in the year by kawawei as follows:
(5230000 × 179800kcal)/(7000 × 1000) ═ 134336 tons
According to the conversion coefficient of the coke and standard coal of 0.9714, the average price of the outsourced coke is calculated according to 1900 yuan/t, and the annual sensible heat consumption coal quantity is as follows:
(134336/0.9714). times.1900 ═ 2.628 yen
2. Current utilization of blast furnace slag
At present, the temperature of blast furnace slag is 1500 ℃ to 1550 ℃, the blast furnace slag belongs to high-grade heat energy, the utilization of the high-grade heat value is researched by the existing research institutions, Chuanwei cooperates with the research institutions to develop the blast furnace slag agglomeration process, the basic flow is to cool and agglomerate liquid slag, and then heat energy recovery is carried out on red hot slag blocks, and the process is similar to sintering and dry quenching waste heat power generation.
The heat utilization rate of blast furnace slag in the whole country is extremely low in research, northern enterprises generate hot water for heating by using the blast furnace slag in winter, but the northern enterprises are limited to winter, southern enterprises have no relevant record of sensible heat utilization of the blast furnace slag, and the northern enterprises and the southern enterprises all belong to low-grade heat value recovery.
The above technique has the following problems:
1. the heat of the slag flushing water belongs to low-grade heat energy, so that the recovery investment is large, the slag flushing water is corrosive, and the requirement on equipment is high.
2. In some northern cities, the heat value of low-grade slag flushing water is recovered for heating, but the low-grade slag flushing water is only used in winter, so that the low-grade slag flushing water is long in idle time and difficult to maintain.
3. The blast furnace slag casting and agglomeration process is a development stage of a heat energy recovery technology for cooling and agglomerating liquid slag and then carrying out heat energy recovery on red hot slag blocks, belongs to medium-grade heat energy utilization, and has no precedent for successfully applying the technology.
The three modes not only have large investment and immature technical development, but also can not apply the high-grade heat energy of the slag.
Disclosure of Invention
The invention aims to provide a method for recovering high-grade heat energy of blast furnace slag, which solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for recovering high-grade heat energy of blast furnace slag comprises the following steps:
s1, treating the foam slag in front of the vanadium titano-magnetite furnace: shoveling a heat absorbing material into the large ditch for cooling, wherein the heat absorbing material absorbs heat in the main ditch and melts, so that the slag temperature is reduced, and the hidden danger that the foam slag overflows the ditch is eliminated;
s2, smelting molten iron property by using schreyerite: further processing the blast furnace to obtain a production raw material for sintering or pelletizing;
s3, treating the slag-iron mixture by utilizing sensible heat of the slag:
a. pushing the slag-iron blocky mixture on the edge of the main runner into the main runner by using a small excavator, suspending the slag-iron blocky mixture on a slag-iron interface in the main runner, absorbing the sensible heat of high-grade slag, melting the slag-iron blocky mixture into liquid blast furnace slag and red molten iron, and then separating the slag from the iron by using a skimmer;
b. waste drill rods, penetrating rods or waste steel used in front of the furnace are directly placed into the main channel for heat absorption and melting;
c. the slag-iron mixture added into the molten iron in front of the furnace is suspended at a slag-iron interface, and absorbs heat to melt and separate the slag-iron.
Preferably, the heat absorbing material in step S1 is yellow sand, water granulated slag or brick.
Preferably, in step S3, the furnace temperature is selected to be equal to or higher than a predetermined middle limit.
Preferably, the condition of the slag-iron mixture added into the molten iron before the furnace in the step S3 c is that when the online temperature measurement reaches 1450 ℃, the slag temperature reaches 1500 ℃, and the granularity is below 150 mm.
Compared with the prior art, the invention has the beneficial effects that: the method utilizes the high-grade heat value of the blast furnace slag, the temperature of the blast furnace slag is still higher than the melting point after the slag is utilized to partially sensible heat, the blast furnace slag is discharged from a slag runner in a liquid state, further heat energy development and utilization of the slag are not influenced, comprehensive utilization of internal resources in iron making is realized, secondary resources are reduced, repeated processing and transportation cost is reduced, foam slag is generated when the temperature of the slag is too high, the slag is cooled by using a slag-iron mixture, the formation of the foam slag can be successfully inhibited, and the sensible heat of the slag is recovered.
Detailed Description
The invention provides a technical scheme that: a method for recovering high-grade heat energy of blast furnace slag comprises the following steps:
s1, treating the foam slag in front of the vanadium titano-magnetite furnace: shoveling a heat absorbing material into the large ditch for cooling, wherein the heat absorbing material absorbs heat in the main ditch and melts, so that the slag temperature is reduced, and the hidden danger that the foam slag overflows the ditch is eliminated;
s2, smelting molten iron property by using schreyerite: further processing the blast furnace to obtain a production raw material for sintering or pelletizing;
s3, treating the slag-iron mixture by utilizing sensible heat of the slag:
a. pushing the slag-iron blocky mixture on the edge of the main runner into the main runner by using a small excavator, suspending the slag-iron blocky mixture on a slag-iron interface in the main runner, absorbing the sensible heat of high-grade slag, melting the slag-iron blocky mixture into liquid blast furnace slag and red molten iron, and then separating the slag from the iron by using a skimmer;
b. waste drill rods, penetrating rods or waste steel used in front of the furnace are directly placed into the main channel for heat absorption and melting;
c. the slag-iron mixture added into the molten iron in front of the furnace is suspended at a slag-iron interface, and absorbs heat to melt and separate the slag-iron.
Wherein, the heat absorbing material in the step S1 is yellow sand, water granulated slag or bricks.
When the furnace temperature is selected to be equal to or higher than the predetermined middle limit in step S3 a, the slag flow rate at the end of tapping is large and the iron flow rate is small.
And C, under the condition that the temperature of the slag-iron mixture added into the molten iron before the furnace in the step S3 reaches 1450 ℃ on line, the temperature of the slag reaches 1500 ℃, the granularity is below 150mm, the added slag-iron mixture is suspended on a slag-iron interface and absorbs heat to melt and separate the slag and the iron, so that the added iron can be recovered, the sensible heat of the slag can be recovered, and the generation of foam slag to cause ditch overflow can be inhibited.
Example (b):
s1, a method for treating vanadium titano-magnetite stokehole foam slag comprises the following steps: the vanadium titano-magnetite smelting slag amount is 100 kg/t.Fe-200 kg/t.Fe more than that of common ore, so that the main economic indexes such as fuel ratio and the like are not as good as that of the common ore, and the vanadium titano-magnetite has narrow furnace temperature control interval due to the particularity, and foam slag appears when the furnace temperature is preferred, and if the treatment is not timely carried out, the slag can overflow from the edge of a large ditch to influence the normal production;
s2, smelting molten iron property by using schreyerite: compared with the common ore, the vanadium-titanium ore has the main characteristics that because a small amount of TiC and TiN exist in slag, the slag-iron separation effect is poorer than that of the common ore, the slag-iron separation effect is easier to stick to a ladle and a tank, and a certain slag-iron mixture is easy to appear in the production process;
s3, treating the slag-iron mixture by utilizing sensible heat of the slag: the main channel in front of the blast furnace is a slag-iron separation place after molten iron is discharged from the furnace, and currently 1750m3The blast furnace uses an iron storage type main channel, the daily output of each blast furnace is 4850t, calculated according to a slag ratio of 460kg/t.Fe, the slag amount is 2200 t/base per day, the temperature of the slag in the main channel is 30-70 ℃ higher than that of molten iron, heat transfer is carried out between slag and molten iron at a slag-iron interface in the main channel, and the sensible heat utilization of the slag is carried out by the following three stepsThe method comprises the following steps:
a. the method comprises the steps that when the furnace temperature is selected to be above a specified middle limit, the slag flow is large and the iron flow is small in the later tapping period, the massive slag and iron mixture on the side of the main channel is pushed into the main channel by a small excavator to be suspended on a slag and iron interface in the main channel, sensible heat of high-grade slag is absorbed, the sensible heat is melted into liquid blast furnace slag and red molten iron, and then slag and iron are separated by a skimmer;
b. waste steel and iron such as used waste drill rods and penetrating rods in front of the furnace are directly put into the main channel for heat absorption and melting;
c. when the on-line temperature measurement of the molten iron in front of the furnace reaches 1450 ℃, the slag temperature is expected to reach 1500 ℃, sticky ladle iron with the iron content of 40-90% and slag iron mixture generated in iron making can be directly added into a main channel when the granularity is below 150mm, the added slag iron mixture is suspended on a slag iron interface and absorbs heat to melt and separate slag iron, the added iron can be recycled, the sensible heat of slag can be recycled, and the generation of foam slag can be inhibited to cause channel overflow;
and (3) verification calculation: the specific heat capacity of molten iron is 0.46kJ/(kg. ℃), the specific heat capacity of slag is about 1.2 kJ/(kg. ℃), each blast furnace is used for processing 10t/d of slag-iron mixture, wherein the iron content is 70%, the slag content is 30%, the initial temperature is 50 ℃, the slag content per day of the blast furnace is 2200t/d, the average temperature of slag is 1480 ℃, after 10 tons of slag-iron are added and completely melted, if the heat energy required for melting is provided by the slag, the average temperature of the slag after melting is calculated as follows:
from the above calculation, after 10t of slag-iron mixture is added to the main channel every day, the slag is melted according to the total absorbed slag heat, and the reduction amount of the slag temperature is as follows:
△T＝1480℃-1476.3℃
＝3.7℃
it follows that the addition of about 10t of the slag-iron mixture per day does not have any effect on the fluidity of the slag-iron.
Claims (4)
1. A method for recovering high-grade heat energy of blast furnace slag is characterized by comprising the following steps: the method comprises the following steps:
s1, treating the foam slag in front of the vanadium titano-magnetite furnace: shoveling a heat absorbing material into the large ditch for cooling, wherein the heat absorbing material absorbs heat in the main ditch and melts, so that the slag temperature is reduced, and the hidden danger that the foam slag overflows the ditch is eliminated;
s2, smelting molten iron property by using schreyerite: further processing the blast furnace to obtain a production raw material for sintering or pelletizing;
s3, treating the slag-iron mixture by utilizing sensible heat of the slag:
a. pushing the slag-iron blocky mixture on the edge of the main runner into the main runner by using a small excavator, suspending the slag-iron blocky mixture on a slag-iron interface in the main runner, absorbing the sensible heat of high-grade slag, melting the slag-iron blocky mixture into liquid blast furnace slag and red molten iron, and then separating the slag from the iron by using a skimmer;
b. waste drill rods, penetrating rods or waste steel used in front of the furnace are directly placed into the main channel for heat absorption and melting;
c. the slag-iron mixture added into the molten iron in front of the furnace is suspended at a slag-iron interface, and absorbs heat to melt and separate the slag-iron.
2. The method for recovering high-grade heat energy of blast furnace slag according to claim 1, characterized in that: the heat absorbing material in the step S1 is yellow sand, water granulated slag or bricks.
3. The method for recovering high-grade heat energy of blast furnace slag according to claim 1, characterized in that: in step S3, when the furnace temperature is selected to be equal to or higher than a predetermined middle limit.
4. The method for recovering high-grade heat energy of blast furnace slag according to claim 1, characterized in that: and (C) the condition of the slag-iron mixture added into the molten iron before the furnace in the step S3 is that when the online temperature measurement reaches 1450 ℃, the slag temperature reaches 1500 ℃, and the granularity is below 150 mm.
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| CN202010408871.2A CN111719027A (en) | 2020-05-14 | 2020-05-14 | Method for recovering high-grade heat energy of blast furnace slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045291A (en) * | 2021-03-31 | 2021-06-29 | 成渝钒钛科技有限公司 | High-titanium blast furnace slag external thermal insulation material and preparation method thereof |
| CN115287385A (en) * | 2022-08-10 | 2022-11-04 | 广东韶钢松山股份有限公司 | Slag removing device for iron slag runner and slag removing method for blast furnace iron slag runner |
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2020
- 2020-05-14 CN CN202010408871.2A patent/CN111719027A/en active Pending
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113045291A (en) * | 2021-03-31 | 2021-06-29 | 成渝钒钛科技有限公司 | High-titanium blast furnace slag external thermal insulation material and preparation method thereof |
| CN115287385A (en) * | 2022-08-10 | 2022-11-04 | 广东韶钢松山股份有限公司 | Slag removing device for iron slag runner and slag removing method for blast furnace iron slag runner |
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Application publication date: 20200929 |