CN220788655U - Blast furnace slag sensible heat dual-utilization device - Google Patents
Blast furnace slag sensible heat dual-utilization device Download PDFInfo
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- CN220788655U CN220788655U CN202322314079.2U CN202322314079U CN220788655U CN 220788655 U CN220788655 U CN 220788655U CN 202322314079 U CN202322314079 U CN 202322314079U CN 220788655 U CN220788655 U CN 220788655U
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- 239000002893 slag Substances 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 82
- 238000004140 cleaning Methods 0.000 claims description 25
- 239000000428 dust Substances 0.000 claims description 17
- 230000009977 dual effect Effects 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000003723 Smelting Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The utility model relates to a slag sensible heat dual-utilization device, and belongs to the technical field of blast furnace smelting. The hot slag collecting box is respectively connected with a first air blower and a hot air pipe unit, and compressed air is blown into the hot slag collecting box by the first air blower so that the compressed air exchanges heat with hot slag; the hot air pipe unit is respectively connected with the gas heat exchange unit and the material clearing heat exchange unit, the gas heat exchange unit is connected with the turbine unit, and the material clearing heat exchange unit is connected with the lump ore bin; the gas heat exchange unit exchanges heat between the gas and the hot air to form heat exchange gas and cold air, and the heat exchange gas flows into the turbine unit and is discharged outside; the material clearing heat exchange unit exchanges heat between the material clearing air and hot air to form material clearing hot air and cold air, and the material clearing hot air is used for clearing the sticky materials in the lump ore bin. The slag heat recovery conversion is realized to the electric energy, energy saving and cost reduction, the mine trough block mine sticky materials can be cleaned, and potential safety hazards are reduced.
Description
Technical Field
The utility model relates to a blast furnace slag sensible heat dual-utilization device, and belongs to the technical field of blast furnace smelting.
Background
Typically about 0.3t of blast furnace slag is produced per 1t of pig iron smelted, the world production of blast furnace pig iron in 2020 is about 13 hundred million tons and the production of blast furnace slag is about 3.9 hundred million tons. Because the temperature of the blast furnace slag is above 1500 ℃, most of the prior methods adopt direct water flushing slag, not only are a great deal of water resources wasted, but also the sensible heat of the blast furnace slag cannot be effectively utilized.
The granularity of the lump ore under the blast furnace trough is generally 0-8mm, the water content is 2-6%, as the lower surface of the lump ore bin is inclined in a slope manner and is influenced by the size of a discharge hole, the conditions of difficult discharging, slow discharging, hanging and the like are easily caused, the blast furnace needs to temporarily reduce the proportion of materials, change the structure of the materials, organize personnel to clean the ore trough for the materials, and potential safety hazards are generated due to deep inside the bin, poor light, sliding of the internal raw materials during cleaning and the like, and the wet furnace burden enters the blast furnace to increase the fuel consumption.
In the iron-making industry, a gas turbine device is generally adopted to drive a generator to generate electricity through expansion work of the dedusted gas, so that the high-efficiency recycling of the heat energy and the pressure energy of the blast furnace gas is realized. The higher the temperature of the gas entering the turbine device is, the larger the generated energy is, and the generated energy is increased by about 3 percent when the inlet temperature of the gas turbine device is increased by 10 ℃, so that the electric energy consumption is increased, and the production cost is increased.
Disclosure of Invention
Aiming at the prior art, the utility model provides the blast furnace slag sensible heat dual-utilization device, which realizes the recovery of slag heat energy and the conversion of the slag heat energy into electric energy, saves energy and reduces the cost, can clean ore tank block ore binders and reduces potential safety hazards.
The utility model solves the problems by adopting the following technical scheme: the sensible heat dual utilization device of the blast furnace slag comprises a hot slag collecting box, wherein an air inlet of the hot slag collecting box is connected with a first air blower, an air outlet of the hot slag collecting box is connected with a hot air pipe unit, and compressed air is blown into the hot slag collecting box by the first air blower, so that the compressed air and hot slag are subjected to heat exchange to form hot air and cold slag, and the hot air flows into the hot air pipe unit; the hot air pipe unit is respectively connected with the gas heat exchange unit and the material clearing heat exchange unit, the gas heat exchange unit is connected with the turbine unit, and the material clearing heat exchange unit is connected with the lump ore bin; the gas heat exchange unit exchanges heat between the gas and the hot air to form heat exchange gas and cold air, and the heat exchange gas flows into the turbine unit and is discharged outside; the material clearing heat exchange unit exchanges heat between the material clearing air and hot air to form material clearing hot air and cold air, and the material clearing hot air is used for clearing the sticky materials in the lump ore bin.
The hot air pipe unit comprises a hot air main pipe, the outlet of the hot air main pipe is respectively connected with one end of a first hot air branch pipe and one end of a second hot air branch pipe, the other end of the first hot air branch pipe is connected with the gas heat exchange unit, and the other end of the second hot air branch pipe is connected with the material cleaning heat exchange unit.
The gas heat exchange unit comprises a gas heat exchanger, the gas heat exchanger comprises a gas heat exchange shell, a gas heat exchange tube bundle is arranged in the gas heat exchange shell, one end of the gas heat exchange tube bundle is connected with a first hot air branch pipe, and the other end of the gas heat exchange tube bundle is connected with a first discharge pipe; the inlet of the gas heat exchange shell is connected with the blast furnace gas outlet through the dust removal unit, and the outlet of the gas heat exchange shell is connected with the turbine unit through the gas heat exchange tube.
The dust removing unit comprises a cyclone dust remover and a cloth bag dust remover which are connected in series, and the cloth bag dust remover is connected with the inlet of the gas heat exchange shell through a gas pipe.
A gas bypass pipe is arranged between the gas pipe and the gas heat exchange pipe, and a gas bypass valve is arranged on the gas bypass pipe.
The material cleaning heat exchange unit comprises a material cleaning heat exchanger, the material cleaning heat exchanger comprises a material cleaning heat exchange shell, a material cleaning heat exchange tube bundle is arranged in the material cleaning heat exchange shell, one end of the material cleaning heat exchange tube bundle is communicated with a second hot air branch pipe, and the other end of the material cleaning heat exchange tube bundle is connected with a second discharge pipe; the inlet of the material clearing heat exchange shell is connected with the second air blower, and the outlet of the material clearing heat exchange shell is connected with the bin slot of the lump ore bin through a material clearing hot air pipe.
Compared with the prior art, the utility model has the advantages that: a slag sensible heat dual-utilization device utilizes the heat energy of blast furnace slag to heat compressed air to about 300 ℃ to form hot air, then the hot air is respectively subjected to heat exchange with air and coal gas, the temperature of the air after the exchange is heated from 25 ℃ to 150 ℃, and the temperature of the coal gas is heated from 100 ℃ to 200 ℃. The heated air is sent to the ore tank through the material cleaning pipeline and is communicated with the middle and lower parts of the easy-to-stick material in the ore tank, so that raw materials can be preheated, ore-block-ore-stick materials in the ore tank can be cleaned, potential safety hazards can be reduced while the aim of reducing the cost is achieved, the block ore can be heated to about 100 ℃, the expected fuel ratio can be saved by 1.5kg/t, and the annual benefit of saving fuel can be up to 900 tens of thousands yuan by calculating with a 2000-cubic blast furnace. The heat exchange gas is sent to the ventilation device through the gas heat exchange pipe, the generated energy of the turbine device is increased by about 3% when the inlet temperature of the turbine device is increased by 10 ℃, so that the recovery of slag heat energy is realized, the generated energy of ton iron can be increased by 10-12 degrees, and the annual benefit of generating more electric energy can reach more than 1500 ten thousand yuan calculated by a 2000-cubic blast furnace.
Drawings
Fig. 1 is a schematic diagram of a blast furnace slag sensible heat dual-use device according to an embodiment of the utility model;
in the drawing, a first blower, a 2 compressed air inlet valve, a 3 total hot air outlet valve, a 4 blast furnace hot slag, a 5 blast furnace, a 6 cyclone dust collector, a 7 bag dust collector, a 8 first hot air inlet valve, a 9 gas heat exchanger, a 10 first cold air outlet valve, a 11 gas inlet valve, a 12 gas outlet valve, a 13 gas bypass valve, a 14 turbine device, a 15 generator, a 16 pressure regulating valve group, a 17 second hot air inlet valve, a 18 material clearing heat exchanger, a 19 second cold air outlet valve, a 20 second blower, a 21 air inlet valve, a 22 material clearing outlet valve, a 23 ore bin, a 24 hot air main pipe, a 25 first hot air branch pipe, a 26 gas pipe, a 27 gas heat exchange pipe, a 28 second hot air branch pipe, a 29 material clearing hot air pipe and a 30 hot slag collecting box are arranged.
Detailed Description
The utility model is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1, the blast furnace slag sensible heat dual-use device in the present embodiment includes a hot slag collecting tank 30, and the hot slag collecting tank 30 is provided below a slag hole of the blast furnace 5. The air inlet of the hot slag collecting box 30 is connected with the first air blower 1 through a compressed air pipe, the air outlet of the hot slag collecting box 30 is connected with the hot air pipe unit, the first air blower 1 blows compressed air into the hot slag collecting box 30 through the compressed air pipe, so that the compressed air exchanges heat with hot slag to form hot air and cold slag, the hot slag generated by a blast furnace is cooled, the compressed air is heated, and the hot air flows into the hot air pipe unit. The hot air pipe unit is respectively connected with the gas heat exchange unit and the material cleaning heat exchange unit, and the gas heat exchange unit is used for exchanging heat between gas and hot air to form heat exchange gas and cold air; the gas heat exchange unit is connected with the turbine unit, so that heat exchange gas flows into the turbine unit. The material clearing heat exchange unit is used for exchanging heat between the material clearing air and hot air to form material clearing hot air and cold air, and is communicated with the bin groove of the lump ore bin 23, so that the material clearing hot air can clear the sticky materials in the lump ore bin.
The hot air pipe unit comprises a hot air main pipe 24, and the outlet of the hot air main pipe 24 is connected with one end of a first hot air branch pipe 25 and one end of a second hot air branch pipe 28; the other end of the first hot air branch pipe 25 is connected with the gas heat exchange unit, and the other end of the second hot air branch pipe 28 is connected with the material cleaning heat exchange unit. The compressed air pipe is provided with a compressed air inlet valve 2, the hot air main pipe 24 is provided with a total hot air outlet valve 3, and when the heat exchange device is overhauled, the first blower, the compressed air inlet valve and the total hot air outlet valve are closed.
The gas heat exchange unit comprises a gas heat exchanger 9, wherein the gas heat exchanger comprises a gas heat exchange shell and a gas heat exchange tube bundle, and the gas heat exchange tube bundle is arranged in the gas heat exchange shell. One end of the gas heat exchange tube bundle is communicated with the first hot air branch pipe 25, and the other end of the gas heat exchange tube bundle is connected with the first discharge pipe; the inlet of the gas heat exchange shell is connected with the bag-type dust collector 7 through a gas pipe 26, the bag-type dust collector 7 is connected with the blast furnace gas outlet through the cyclone dust collector 6, and the outlet of the gas heat exchange shell is connected with the turbine unit through a gas heat exchange pipe 27. The gas flowing out of the blast furnace is dedusted by a cyclone dust collector 6 and a cloth bag dust collector 7, the dedusted gas flows into a gas heat exchange shell through a gas pipe 26, and the gas and hot air in a first hot air branch pipe 25 flow reversely, so that heat exchange is carried out on the gas and the hot air to form heat exchange gas and cold air, the heat exchange gas flows into a turbine unit through the gas heat exchange pipe, and the cold air is discharged through a first discharge pipe.
The gas pipe 26 is provided with a gas inlet valve 11, and the gas heat exchange pipe 27 is provided with a gas outlet valve 12. A gas bypass pipe 13 is arranged between the gas pipe 26 and the gas heat exchange pipe 27, and the gas bypass pipe is provided with a gas inlet valve and a gas outlet valve which are closed when the gas heat exchange unit is overhauled or fails, and meanwhile, the gas bypass valve is opened to ensure that the gas can continue to generate electricity through the turbine device.
The turbine unit comprises a turbine device 14, a pressure regulating valve group 16 and a generator 15.
The material clearing heat exchange unit comprises a material clearing heat exchanger 18, wherein the material clearing heat exchanger 18 comprises a material clearing heat exchange shell and a material clearing heat exchange tube bundle, and the material clearing heat exchange tube bundle is arranged in the material clearing heat exchange shell. One end of the material cleaning heat exchange tube bundle is communicated with the second hot air branch pipe 28, and the other end of the material cleaning heat exchange tube bundle is connected with the second discharge pipe; the inlet of the material clearing heat exchange shell is communicated with the second blower 20 through an air pipeline, and the outlet of the material clearing heat exchange shell is communicated with the bin slot of the lump ore bin 23 through a material clearing hot air pipe 29. The second blower 20 blows clean air into the clean heat exchange shell, the clean air and hot air in the clean heat exchange tube bundle flow reversely, so that the clean air and the hot air exchange heat to form clean hot air and cold air, and the clean hot air flows into a bin slot of the lump ore bin through the clean hot air pipe 29, so that sticky materials are cleaned; cold air is discharged outside through the discharge pipe.
The outlet of the material clearing hot air pipe is arranged at the middle lower part of the easily-adhesive material in the lump ore bin.
The first hot air branch pipe 25 is provided with a first hot air inlet valve 8, and the second hot air branch pipe 28 is provided with a second hot air inlet valve 17 for controlling the flow of hot air entering the heat exchange device. The first discharge pipe is provided with a first cold air outlet valve 10, and the second discharge pipe is provided with a second cold air outlet valve 19. The clear material hot-blast main 29 is provided with a clear material outlet valve 22, and the air pipeline is provided with an air inlet valve 21.
The heat energy of blast furnace slag is utilized to heat compressed air to about 300 ℃ to form hot air, then the hot air is respectively subjected to heat exchange with air and coal gas, the temperature of the air after the exchange is heated from 25 ℃ to 150 ℃, and the temperature of the coal gas is heated from 100 ℃ to 200 ℃. The heated air is sent to the ore tank through the material cleaning pipeline and is communicated with the middle and lower parts of the easy-to-stick material in the ore tank, so that raw materials can be preheated, ore-block-ore-stick materials in the ore tank can be cleaned, potential safety hazards can be reduced while the aim of reducing the cost is achieved, the block ore can be heated to about 100 ℃, the expected fuel ratio can be saved by 1.5kg/t, and the annual benefit of saving fuel can be up to 900 tens of thousands yuan by calculating with a 2000-cubic blast furnace. The heat exchange gas is sent to the ventilation device through the gas heat exchange pipe, the generated energy of the turbine device is increased by about 3% when the inlet temperature of the turbine device is increased by 10 ℃, so that the recovery of slag heat energy is realized, the generated energy of ton iron can be increased by 10-12 degrees, and the annual benefit of generating more electric energy can reach more than 1500 ten thousand yuan calculated by a 2000-cubic blast furnace.
In addition to the above embodiments, the present utility model also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present utility model.
Claims (6)
1. The utility model provides a blast furnace slag sensible heat dual utilization device which characterized in that: the hot slag collecting box is respectively connected with a first air blower and a hot air pipe unit, and compressed air is blown into the hot slag collecting box by the first air blower, so that the compressed air and hot slag are subjected to heat exchange to form hot air and cold slag, and the hot air flows into the hot air pipe unit; the hot air pipe unit is respectively connected with the gas heat exchange unit and the material clearing heat exchange unit, the gas heat exchange unit is connected with the turbine unit, and the material clearing heat exchange unit is connected with the lump ore bin; the gas heat exchange unit exchanges heat between the gas and the hot air to form heat exchange gas and cold air, and the heat exchange gas flows into the turbine unit and is discharged outside; the material clearing heat exchange unit exchanges heat between the material clearing air and hot air to form material clearing hot air and cold air, and the material clearing hot air is used for clearing the sticky materials in the lump ore bin.
2. The blast furnace slag sensible heat dual utilization device according to claim 1, wherein: the hot air pipe unit comprises a hot air main pipe, the outlet of the hot air main pipe is respectively connected with one end of a first hot air branch pipe and one end of a second hot air branch pipe, the other end of the first hot air branch pipe is connected with the gas heat exchange unit, and the other end of the second hot air branch pipe is connected with the material cleaning heat exchange unit.
3. The blast furnace slag sensible heat dual-use device according to claim 2, wherein: the gas heat exchange unit comprises a gas heat exchanger, the gas heat exchanger comprises a gas heat exchange shell, a gas heat exchange tube bundle is arranged in the gas heat exchange shell, one end of the gas heat exchange tube bundle is connected with a first hot air branch pipe, and the other end of the gas heat exchange tube bundle is connected with a first discharge pipe; the inlet of the gas heat exchange shell is connected with the blast furnace gas outlet through the dust removal unit, and the outlet of the gas heat exchange shell is connected with the turbine unit through the gas heat exchange tube.
4. The blast furnace slag sensible heat dual utilization device according to claim 3, wherein: the dust removing unit comprises a cyclone dust remover and a cloth bag dust remover which are connected in series, and the cloth bag dust remover is connected with the inlet of the gas heat exchange shell through a gas pipe.
5. The blast furnace slag sensible heat dual utilization device according to claim 4, wherein: a gas bypass pipe is arranged between the gas pipe and the gas heat exchange pipe, and a gas bypass valve is arranged on the gas bypass pipe.
6. The blast furnace slag sensible heat dual utilization device according to claim 1, wherein: the material cleaning heat exchange unit comprises a material cleaning heat exchanger, the material cleaning heat exchanger comprises a material cleaning heat exchange shell, a material cleaning heat exchange tube bundle is arranged in the material cleaning heat exchange shell, one end of the material cleaning heat exchange tube bundle is communicated with a second hot air branch pipe, and the other end of the material cleaning heat exchange tube bundle is connected with a second discharge pipe; the inlet of the material clearing heat exchange shell is connected with the second air blower, and the outlet of the material clearing heat exchange shell is connected with the bin slot of the lump ore bin through a material clearing hot air pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322314079.2U CN220788655U (en) | 2023-08-28 | 2023-08-28 | Blast furnace slag sensible heat dual-utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322314079.2U CN220788655U (en) | 2023-08-28 | 2023-08-28 | Blast furnace slag sensible heat dual-utilization device |
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| Publication Number | Publication Date |
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| CN220788655U true CN220788655U (en) | 2024-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322314079.2U Active CN220788655U (en) | 2023-08-28 | 2023-08-28 | Blast furnace slag sensible heat dual-utilization device |
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| Country | Link |
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| CN (1) | CN220788655U (en) |
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- 2023-08-28 CN CN202322314079.2U patent/CN220788655U/en active Active
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