CN113981157B - Slag stewing waste heat recovery system - Google Patents
Slag stewing waste heat recovery system Download PDFInfo
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- CN113981157B CN113981157B CN202111242523.3A CN202111242523A CN113981157B CN 113981157 B CN113981157 B CN 113981157B CN 202111242523 A CN202111242523 A CN 202111242523A CN 113981157 B CN113981157 B CN 113981157B
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- slag
- steam
- waste heat
- water
- heat recovery
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- 239000002893 slag Substances 0.000 title claims abstract description 128
- 238000011084 recovery Methods 0.000 title claims abstract description 46
- 239000002918 waste heat Substances 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000011010 flushing procedure Methods 0.000 claims abstract description 28
- 238000009628 steelmaking Methods 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 238000009834 vaporization Methods 0.000 claims abstract description 13
- 230000008016 vaporization Effects 0.000 claims abstract description 13
- 238000004064 recycling Methods 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 abstract description 10
- 230000036961 partial effect Effects 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 101100298225 Caenorhabditis elegans pot-2 gene Proteins 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 230000001502 supplementing effect Effects 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Furnace Details (AREA)
Abstract
The application provides a stewing slag waste heat recovery system, which comprises: the slag flushing device is used for spraying water to cool the residual slag, generating steam and outputting the steam; and the waste heat recovery device is used for receiving the steam, cooling the steam by desalted water, conveying condensed water obtained by cooling to the slag flushing device for recycling, and conveying the desalted water subjected to heat exchange to a steelmaking converter vaporization cooler after deoxidizing. The embodiment of the application solves the technical problems that in the prior art, partial steam cannot reach the standard of conventional recycling in the open air environment in pressure and temperature, the partial energy is wasted due to direct diffusion, and meanwhile, a large amount of steam is discharged in the open air to the surrounding environment to cause visual pollution and noise, so that the energy running cost is reduced, and the visual and noise pollution caused by the steam is further eliminated.
Description
Technical Field
The application relates to the technical field of waste heat recovery in steel smelting, in particular to a slag stewing waste heat recovery system.
Background
Part of iron and steel enterprises can generate slag with higher heat in the steelmaking production process, and as the slag heat is higher, many enterprises adopt an open-air spraying and water spraying mode to cool the slag and then comprehensively treat the slag. In the cooling process of the residue, a large amount of steam can be generated after water spraying due to higher residual heat of the residue, and the pressure and the temperature of the part of steam in the open air environment can not reach the standard of conventional recycling, so that the part of energy is wasted due to direct diffusion, and meanwhile, a large amount of steam is discharged in the open air to cause visual pollution and noise to the surrounding environment.
In view of the above problems, the core of the method is to collect the steam generated after spraying to make the temperature and pressure reach the recycling standard, and then find out relevant users to comprehensively utilize the steam to reduce the energy running cost, thereby eliminating the visual pollution caused by the steam, setting up the better environment image of the enterprise and improving the comprehensive competitive strength of the enterprise.
Disclosure of Invention
The embodiment of the application solves the technical problems that in the prior art, partial steam cannot reach the standard of conventional recycling in the open air environment in pressure and temperature, the partial energy is wasted due to direct diffusion, and meanwhile, a large amount of steam is discharged in the open air to the surrounding environment to cause visual pollution and noise, so that the energy running cost is reduced, and the visual pollution caused by the steam is further eliminated.
The embodiment of the application provides a stewing slag waste heat recovery system, which comprises:
the slag flushing device is used for spraying water to cool the residual slag, generating steam and outputting the steam;
and the waste heat recovery device is used for receiving the steam, cooling the steam by desalted water, conveying condensed water obtained by cooling to the slag flushing device for recycling, and conveying the desalted water subjected to heat exchange to a steelmaking converter vaporization cooler after deoxidizing.
Further, the slag flushing device comprises:
the slag groove is used for collecting residual slag;
the slag stewing tank is arranged at the bottom of the slag stewing tank and is used for cooling the residual slag in the slag stewing tank so as to generate steam;
and one end of the steam pipe is connected with the slag stewing pot, the other end of the steam pipe is connected with the waste heat recovery device, and steam is conveyed into the waste heat recovery device through the steam pipe by the slag stewing pot.
Further, one side of the slag stewing pot is provided with a door, and when the door is closed, the slag stewing pot is sealed.
Further, the sprayer is arranged at the top of the slag stewing pot and is used for spraying and cooling the residue in the slag groove.
Further, hoisting mechanisms are arranged at two ends of the slag groove, and the slag groove is hoisted into the slag stewing pot by the crown block after being filled with residual slag.
Further, the waste heat recovery device includes:
the heat accumulator is connected with the slag stewing pot through the steam pipe and is used for storing and stabilizing the steam output by the slag stewing pot;
the heat exchanger is connected with the heat accumulator and is used for receiving steam output by the heat accumulator;
the pump station is connected with the heat exchanger and used for conveying desalted water to the heat exchanger and cooling steam output by the heat accumulator and simultaneously generating condensed water and hot desalted water;
and one end of the slag flushing water tank is connected with the heat exchanger, the other end of the slag flushing water tank is connected with the sprayer, and the slag flushing water tank is used for collecting the condensed water and conveying the condensed water to the sprayer.
Further, the waste heat recovery device further includes:
the filter is arranged between the slag stewing pot and the heat accumulator and is used for filtering steam output by the slag stewing pot.
Further, the waste heat recovery device further includes:
and the residual steam recovery mechanism is connected with the heat accumulator and is used for recovering residual steam in the heat accumulator.
Further, the waste heat recovery device further includes:
and one end of the deaerator is connected with the heat exchanger, the other end of the deaerator is connected with the steelmaking converter vaporization cooler, and the deaerator is used for conveying the deoxidized hot desalted water to the steelmaking converter vaporization cooler for cooling after deoxidizing the hot desalted water output by the heat exchanger.
Further, the waste heat recovery device further includes:
and the safety valve is connected with the heat accumulator.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages: according to the application, through the structural design of the slag flushing device, steam generated in the cooling process of the residual slag is collected and recycled through the waste heat recovery device, so that condensed water generated after the steam is cooled is returned to a slag flushing water system, the slag flushing water supplementing quantity is reduced, the waste heat recovery utilization rate of enterprises can be effectively increased, the effective utilization of low-quality heat sources is realized, and the energy running cost of the enterprises is further effectively reduced; meanwhile, after the system is put into operation, the emission of enterprises can be effectively reduced, noise is diffused, the whitening of partial areas is realized, visual pollution is eliminated, and a better environment image is built for the enterprises.
Drawings
Fig. 1 is a process flow diagram of the slag stewing waste heat recovery system in embodiment 1 of the application.
Fig. 2 is a schematic structural diagram of a slag flushing device in the slag stewing waste heat recovery system shown in fig. 1.
Detailed Description
The embodiment of the application provides a stewing residue waste heat recovery system, which mainly aims at collecting steam generated in the cooling process of residue, finding a proper procedure for utilization, and returning condensed water to a slag flushing water system after cooling the steam, so as to reduce the water supplementing amount of slag flushing and eliminate visual pollution caused by slag flushing steam.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
The embodiment of the application provides a stewing slag waste heat recovery system, which comprises: the slag flushing device is used for spraying water to cool the residual slag, generating steam and outputting the steam; the waste heat recovery device is used for receiving steam, cooling the steam by desalted water, conveying condensed water obtained by cooling to the slag flushing device for recycling, deoxidizing the desalted water after heat exchange, and conveying the deoxidized water to the vaporization cooler of the steelmaking converter.
Referring to fig. 1 and 2, the slag flushing device includes: the slag pot 1 is used for collecting residual slag; the slag bath 1 is arranged at the bottom of the slag stewing pot 2, and the slag stewing pot 2 is used for cooling the residual slag in the slag bath 1 so as to generate steam; one end of a steam pipe 3 is connected with the slag stewing pot 2, the other end is connected with a waste heat recovery device, and steam is conveyed into the waste heat recovery device from the slag stewing pot 2 through the steam pipe 3. One side of the slag stewing pot 2 is provided with a door 4, and when the door 4 is closed, the slag stewing pot 2 is sealed. The sprayer 5 is arranged at the top of the slag stewing pot 2, and the sprayer 5 is used for spraying and cooling the residual slag in the slag tank 1. Two ends of the slag groove 1 are provided with hoisting mechanisms, and the slag groove 1 is hoisted into the slag stewing pot 2 by a crown block after being filled with residual slag.
The waste heat recovery device comprises a heat accumulator 6, a heat exchanger 7, a pump station 8, a slag flushing water tank 9, a filter 10, a waste steam recovery mechanism 11, a deaerator 12 and a safety valve 13, wherein the heat accumulator 6 is connected with the slag stewing pot 2 through a steam pipe 3, and the heat accumulator 6 is used for storing and stabilizing steam output by the slag stewing pot 2; the heat exchanger 7 is connected with the heat accumulator 6, and the heat exchanger 7 is used for receiving steam output by the heat accumulator 6; the pump station 8 is connected with the heat exchanger 7, and the pump station 8 is used for conveying desalted water to the heat exchanger 7, cooling the steam output by the heat accumulator 6 and simultaneously generating condensed water and hot desalted water; one end of a slag flushing water tank 9 is connected with the heat exchanger 7, the other end of the slag flushing water tank 9 is connected with the sprayer 5, and the slag flushing water tank 9 is used for collecting condensed water and conveying the condensed water to the sprayer 5. A filter 10 is provided between the slag pot 2 and the regenerator 6, the filter 10 being for filtering the steam output from the slag pot 2. The residual steam recovery mechanism 11 is connected with the heat accumulator 6, and the residual steam recovery mechanism 11 is used for recovering the residual steam in the heat accumulator 6. One end of the deaerator 12 is connected with the heat exchanger 7, the other end is connected with the steelmaking converter vaporization cooler 14, and the deaerator 12 is used for deoxidizing the hot desalted water output by the heat exchanger 7 and then conveying the deoxidized hot desalted water to the steelmaking converter vaporization cooler for cooling 14. The safety valve 13 is connected to the heat accumulator 6.
When the slag stewing waste heat recovery system provided by the application is used for working, the slag stewing waste heat recovery system comprises: the residual slag generated in the production process is collected through the slag groove 1, lifted into the slag stewing tank 2 by the crown block, then water is taken in for cooling by the sprayer 5, steam is generated simultaneously, the steam enters the heat accumulator 6 after being filtered by the filter 10 through the steam pipe 3 after reaching a certain pressure and temperature, the steam enters the heat exchanger 7 after being stored and stabilized in the heat accumulator 6, meanwhile, water entering the pump station 8 also enters the heat exchanger 7 for heat exchange, the water entering the deaerator 12 is deoxidized after the temperature of the water entering is increased, condensed water generated after the steam is cooled enters the slag flushing water tank 9 and then enters the sprayer 5 in the slag stewing tank 2 to serve as a water source, and the water supplementing of the sprayer 5 is reduced. Part of steam in the heat accumulator 6 enters the residual steam recovery mechanism 11 for recycling, the diffusing opening of the safety valve 13 is reasonably controlled according to the running requirement of the system, and meanwhile, the safety valve 13 can ensure the safety of the whole system when the system fails. In the embodiment, the slag flushing device is integrally made of high-temperature resistant materials, a common plate heat exchanger 7 is used for heat exchange, and all external connecting pipelines are made of common carbon steel materials.
According to the calculation of producing 0.17 ton of steam from ton slag and producing 130 ten thousand tons of steel slag from 1000 ten thousand tons of steel in one-stage steelmaking year, 22 ten thousand tons of steam per year and 27.5t/h of steam can be produced.
The average water supplementing amount of the vaporization cooling device of the steelmaking converter is 100t/h (50-200 t/h fluctuation), and the vapor generated by the vaporization cooling device and the thermal stewing tank can be condensed by 13.6t/h vapor on average, and the rest of vapor is diffused; the water supplementing quantity is fluctuated to the maximum value, and the slag stewing steam can be totally condensed. The original use of S2 steam of the steel-making converter correspondingly reduces 13t/h consumption, saves 10 ten thousand tons of steam consumption every year, reduces 10 ten thousand tons of industrial water by a system for condensing and recycling slag stewing steam, and calculates the energy-saving benefit by 1200 ten thousand yuan according to the prices of 110 yuan/t steam and 10 yuan/t industrial water.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. the temperature of hot slag is about 500 ℃, water is quickly vaporized in the slag stewing tank by spraying and water spraying through the structural design of the slag stewing tank 2, the temperature is 119 ℃ after saturated steam is formed, the pressure reaches 0.2Mpa after the steam is concentrated, the steam enters the next working procedure to be utilized, the problem that part of steam in the prior art cannot reach the standard of conventional recycling in the open air environment, the part of energy is wasted due to direct diffusion, and meanwhile, a large amount of steam is discharged in the open air to the surrounding environment to cause visual pollution and noise is solved, the energy running cost is reduced, and the visual pollution caused by the steam is further eliminated.
2. Because the steelmaking produces hot slag in the smelting process and has a certain time gap, the slag disintegrating process is discontinuous, the produced steam is discontinuous, and partial steam can not be completely recovered due to excessive concentration sometimes.
3. According to the embodiment of the application, the design of the heat exchanger 7 is adopted, so that the direct contact of steam or hot water with desalted water to be heated is avoided, and the pollution of the water quality of the desalted water is avoided, and the use of the next procedure is influenced; meanwhile, the design mode of the heat exchanger 7 adopts a wide flow channel design, so that the flow channel is not blocked under the condition that hot water or steam contains impurities, and the welding seam of the heat exchanger 7 is subjected to edge wrapping treatment by utilizing stainless steel materials, so that the corrosion rate of the heat exchanger 7 is further slowed down, and the service life of the heat exchanger is prolonged.
4. According to the embodiment of the application, through adopting the structural design of the deaerator 12, the consumed steam is reduced after the temperature of the desalted water entering the deaerator 12 is increased, the steam entering the heat accumulator 6 is uniformly distributed after the steam quantity is reduced, the deaerating effect of the deaerator 12 is improved, and the stable operation of a converter vaporization cooling system is ensured; meanwhile, the entering steam is reduced, so that the vibration frequency of the deaerator 12 is reduced, and the service life of the deaerator 12 is prolonged.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present application.
Claims (6)
1. A slag stewing waste heat recovery system, comprising:
the slag flushing device is used for spraying water to cool the residual slag, generating steam and outputting the steam;
the waste heat recovery device is used for receiving the steam, cooling the steam by desalted water, conveying condensed water obtained by cooling to the slag flushing device for recycling, deoxidizing the desalted water after heat exchange, and conveying the deoxidized water to a steelmaking converter vaporization cooler;
wherein, the slag flushing device includes:
the slag groove is used for collecting residual slag;
the slag stewing tank is arranged at the bottom of the slag stewing tank and is used for cooling the residual slag in the slag stewing tank so as to generate steam;
one end of the steam pipe is connected with the slag stewing pot, the other end of the steam pipe is connected with the waste heat recovery device, and the steam is conveyed into the waste heat recovery device from the slag stewing pot through the steam pipe;
the sprayer is arranged at the top of the slag stewing tank and is used for spraying and cooling the residue in the slag tank;
the waste heat recovery device includes:
the heat accumulator is connected with the slag stewing pot through the steam pipe and is used for storing and stabilizing steam conveyed in the slag stewing pot;
the heat exchanger is connected with the heat accumulator and is used for receiving steam output by the heat accumulator, the heat exchanger adopts a wide flow passage design, and a welding seam of the heat exchanger is subjected to edge wrapping treatment by utilizing stainless steel materials;
the pump station is connected with the heat exchanger and used for conveying desalted water to the heat exchanger and cooling steam output by the heat accumulator and simultaneously generating condensed water and hot desalted water;
the slag flushing water tank is connected with the heat exchanger at one end and the sprayer at the other end, and is used for collecting the condensed water and conveying the condensed water to the sprayer;
and one end of the deaerator is connected with the heat exchanger, the other end of the deaerator is connected with the steelmaking converter vaporization cooler, and the deaerator is used for conveying the deaerated hot demineralized water to the steelmaking converter vaporization cooler for cooling after deoxidizing the hot demineralized water output by the heat exchanger.
2. The slag stewing waste heat recovery system of claim 1, wherein:
one side of the slag stewing pot is provided with a door, and when the door is closed, the slag stewing pot is sealed.
3. The slag stewing waste heat recovery system of claim 1, wherein:
and hoisting mechanisms are arranged at two ends of the slag groove, and the slag groove is hoisted into the slag stewing pot by the crown block after being filled with residual slag.
4. The slag recovery system of any of claims 1-3, wherein the waste heat recovery device further comprises:
the filter is arranged between the slag stewing pot and the heat accumulator and is used for filtering steam output by the slag stewing pot.
5. The slag recovery system of claim 4, wherein the waste heat recovery device further comprises:
and the residual steam recovery mechanism is connected with the heat accumulator and is used for recovering residual steam in the heat accumulator.
6. The slag recovery system of claim 4, wherein the waste heat recovery device further comprises:
and the safety valve is connected with the heat accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111242523.3A CN113981157B (en) | 2021-10-25 | 2021-10-25 | Slag stewing waste heat recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111242523.3A CN113981157B (en) | 2021-10-25 | 2021-10-25 | Slag stewing waste heat recovery system |
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| Publication Number | Publication Date |
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| CN113981157A CN113981157A (en) | 2022-01-28 |
| CN113981157B true CN113981157B (en) | 2023-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111242523.3A Active CN113981157B (en) | 2021-10-25 | 2021-10-25 | Slag stewing waste heat recovery system |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210438761U (en) * | 2019-08-06 | 2020-05-01 | 天津华赛尔传热设备有限公司 | Steel stewing slag steam waste heat recovery system |
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- 2021-10-25 CN CN202111242523.3A patent/CN113981157B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210438761U (en) * | 2019-08-06 | 2020-05-01 | 天津华赛尔传热设备有限公司 | Steel stewing slag steam waste heat recovery system |
Non-Patent Citations (1)
| Title |
|---|
| 高炉冲渣水余热利用研究;武建国等;《冶金设备》;20170215(第01期);52-55 * |
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