CN209926342U - Hot air utilization system of blast furnace blower - Google Patents
Hot air utilization system of blast furnace blower Download PDFInfo
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- CN209926342U CN209926342U CN201920271956.3U CN201920271956U CN209926342U CN 209926342 U CN209926342 U CN 209926342U CN 201920271956 U CN201920271956 U CN 201920271956U CN 209926342 U CN209926342 U CN 209926342U
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- heat exchanger
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 58
- 239000002918 waste heat Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 6
- 239000000779 smoke Substances 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 7
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000011449 brick Substances 0.000 description 7
- 238000007664 blowing Methods 0.000 description 3
- 239000006227 byproduct Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Abstract
The utility model relates to a hot-blast utilization system of blast furnace air-blower, include the hot-blast furnace of being connected through hot-blast pipeline and blower unit, still include boiler and first heat exchanger, the boiler is connected with the water supply line, the hot medium access & exit of first heat exchanger respectively with hot-blast pipeline connects, the cold medium access & exit of first heat exchanger respectively with the water supply line connects. The utility model provides a hot-blast utilization system of blast furnace air-blower adopts the hot-blast waste heat heating boiler feed water of air-blower export, can sparingly heat the required steam consumption of boiler feed water, when improving boiler thermal efficiency, practices thrift system operation energy consumption effectively, reduction in production cost.
Description
Technical Field
The utility model belongs to the technical field of blast furnace production, concretely relates to hot-blast utilization system of blast furnace air-blower.
Background
The blast furnace hot blast stove is used for heating blast air to a required temperature so as to improve the benefit and efficiency of the blast furnace, reduce the coke ratio, increase the steel yield and save energy. The hot blast stove works according to the heat storage principle: the gas is burnt in the combustion chamber, the high-temperature waste gas passes through the checker bricks and enables the checker bricks to store heat, after the checker bricks are fully heated, the blower supplies air into the hot air furnace, and the cold air is heated and sent out through the checker bricks. The blast furnace is generally provided with two or more than two hot blast stoves, and an alternative air supply mode is adopted, namely when one hot blast stove supplies air, other hot blast stoves are burnt, so that the blast furnace is ensured to supply air continuously.
How to increase the hot air temperature at the outlet of the hot air furnace is the main research direction of the hot air furnace, and the common methods are to mix and burn high-heat value fuel gas, increase the heat exchange area of checker bricks of the hot air furnace, change the material and density of the checker bricks, change the shape of a heat accumulator, preheat coal gas and combustion-supporting air, and the like. Both of these methods will increase the production cost accordingly.
In addition, the boiler feed water of the blast furnace gas boiler needs a large amount of steam to heat the water at the outlet of the deaerator to a certain temperature, so the operation cost is high, and the heat efficiency is low.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a hot-blast utilization system of blast furnace air-blower is related to, partial defect in prior art can be solved at least.
The embodiment of the utility model relates to a hot-blast utilization system of blast furnace air-blower, include the hot-blast furnace of being connected through hot-blast main and blower unit, still include boiler and first heat exchanger, the boiler is connected with the water supply line, the hot medium access & exit of first heat exchanger respectively with hot-blast main connects, the cold medium access & exit of first heat exchanger respectively with the water supply line is connected.
As one embodiment, a deaerator is arranged on the water supply pipeline, and a cold medium outlet of the first heat exchanger is communicated with a water inlet of the deaerator.
As one of the embodiments, the inlet end of the water supply pipeline is connected with a water replenishing pool, a water replenishing pump is arranged on the water supply pipeline, and the water replenishing pool, the water replenishing pump, the first heat exchanger and the deaerator are sequentially connected along the water supply direction.
In one embodiment, a second heat exchanger is further arranged on the hot air pipeline, the second heat exchanger is located between the first heat exchanger and the hot air furnace, and the second heat exchanger is connected with a cooling medium pipeline.
In one embodiment, the cooling medium pipeline is connected with a circulating cooling water source.
In one embodiment, the boiler is a blast furnace gas boiler.
As one embodiment, the boiler is a waste heat boiler and is communicated with the smoke outlet of the hot blast stove
In one embodiment, the blower unit is an electric axial flow blower capable of performing multi-stage compression on air.
The embodiment of the utility model provides a following beneficial effect has at least:
the utility model provides a hot-blast utilization system of blast furnace air-blower adopts the hot-blast waste heat heating boiler feed water of air-blower export, can sparingly heat the required steam consumption of boiler feed water, when improving boiler thermal efficiency, practices thrift system operation energy consumption effectively, reduction in production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a blast furnace blower hot air utilization system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Generally, increasing the temperature of the air at the outlet of the blower 1 is beneficial to increasing the temperature of the air at the outlet of the hot blast stove 3. However, the applicant found that: in actual production, the outlet air temperature of the hot blast stove 3 can be improved by properly reducing the outlet air temperature of the air blower 1, because the outlet air temperature of the air blower 1 is reduced, the heating time required by the air blower 1 to reach the preset temperature is prolonged, the burning time of the hot blast stove 3 in a burning state is correspondingly prolonged, the heat storage capacity of the hot blast stove 3 is more, and the outlet hot air temperature of the hot blast stove 3 can be correspondingly improved. Therefore, the reduction of the air temperature at the outlet of the air blower 1 can reduce the checker brick amount of the hot blast stove 3, reduce the initial investment of the hot blast stove 3 system, and reduce the initial investment of the cold air pipeline system. For example, in the axial flow fan 1 having an outlet air temperature of 200 ℃ or higher, it is advantageous to reduce the blowing temperature of the fan 1 (i.e., the inlet air temperature of the hot air furnace 3) to 150 ℃ or lower, for example, to reduce the blast furnace operation energy consumption and increase the steel production.
Therefore, in this embodiment, the heat of the hot air of the blast furnace blower 1 is fully utilized, and in addition to being blown into the hot blast stove 3 for utilization, the waste heat of the hot air is used to preheat the boiler feed water based on the technical scheme that the blowing temperature of the blower 1 needs to be reduced. As fig. 1, the embodiment of the utility model provides a hot-blast utilization system of blast furnace air-blower, include the hot-blast furnace 3 of being connected through hot-blast pipeline and blower unit, still include boiler 4 and first heat exchanger 6, boiler 4 is connected with the water supply line, the hot medium access & exit of first heat exchanger 6 respectively with hot-blast pipeline connects, the cold medium access & exit of first heat exchanger 6 respectively with the water supply line connects.
Generally, the blower unit comprises a plurality of blowers 1, one hot blast stove 3 can be provided with one blower 1, and two or more blowers 1 can be configured to supply air for the blower; in the structure in which two or more blowers 1 are connected to the same hot blast stove 3, a manner may be adopted in which the main blast pipe is connected to a plurality of branch blast pipes, that is, each blower 1 is connected to the main blast pipe through a branch blast pipe, the main blast pipe is connected to the hot blast stove 3, and the first heat exchanger 6 is preferably provided on the main blast pipe.
In this embodiment, the blower 1 is preferably an electric blower 1, and is driven by a motor 2, so that the operation is stable and reliable. The blower 1 is more preferably an axial flow blower 1 capable of compressing air in multiple stages and having a good blowing effect.
Furthermore, the boiler 4 can be a blast furnace gas boiler 4, and the by-products of the blast furnace are fully utilized, so that the energy consumption of the blast furnace in production and operation is reduced. In another embodiment, the boiler 4 is a waste heat boiler 4, the smoke generated by the hot blast stove 3 is used for heating to generate steam, and the byproduct of the system is fully utilized, so that the operation energy consumption of the system can be reduced, namely, a smoke inlet of the boiler 4 is communicated with a smoke outlet of the hot blast stove 3; the hot blast stove 3 can be filled with blast furnace gas for combustion, thereby fully utilizing the by-products of the blast furnace and reducing the energy consumption of the blast furnace in production and operation.
The first heat exchanger 6 can adopt a conventional heat exchanger, and is preferably an indirect heat exchanger to realize heat exchange between hot air at the outlet of the blower 1 and boiler feed water; in one embodiment, in the first heat exchanger 6, hot air at the outlet of the blower 1 flows through the shell side, and boiler feed water flows through the tube side.
The hot air utilization system of the blast furnace blower provided by the embodiment adopts the hot air waste heat at the outlet of the blower 1 to heat the boiler feed water, so that the steam consumption required by the boiler feed water can be saved, the heat efficiency of the boiler 4 is improved, the system operation energy consumption is effectively saved, and the production cost is reduced.
The steam generated by the boiler 4 is sent to a steam user 5 for utilization, and the steam user 5 may be a heating user, a steam turbine generator set, or the like. In the case that the boiler 4 is a blast furnace gas boiler 4, the generated steam has better quality, and is preferably sent to a steam turbine generator set, and the electric power generated by the steam turbine generator set can be partially used for a motor 2 used by a blast machine set; for the case of the exhaust-heat boiler 4 in which the boiler 4 discharges smoke through the hot-blast stove, the exhaust-heat temperature of the hot-blast stove is generally 200 to 300 ℃, and steam generated by the boiler 4 can be sent to a heating user and the like.
Generally, boiler feed water is treated by a deaerator 10 and then pumped into a boiler 4, that is, as shown in fig. 1, the deaerator 10 is arranged on a feed water pipeline, and a cold medium outlet of the first heat exchanger 6 is communicated with a water inlet of the deaerator 10; a feed pump 11 may be provided between the deaerator 10 and the boiler 4. For the technical scheme that the steam generated by the boiler 4 is sent to the steam turbine generator unit, a steam exhaust outlet of the steam turbine generator unit is connected with the water supply pipeline through a condensed water pipeline, and a condenser and a condensed water pump are arranged on the condensed water pipeline; for the technical scheme that the steam generated by the boiler 4 is sent to the heating user, a water return pipe of the heating user is connected with the water supply pipeline/deaerator 10.
In this embodiment, preferably, the hot air waste heat at the outlet of the blower 1 is used to preheat the water supplemented to the boiler 4; correspondingly, as shown in fig. 1, the inlet end of the water supply pipeline is connected with a water replenishing tank 8, a water replenishing pump 9 is arranged on the water supply pipeline, and along the water supply direction, the water replenishing tank 8, the water replenishing pump 9, the first heat exchanger 6 and the deaerator 10 are sequentially connected.
In another embodiment, it is preferable that the steam generated by the boiler 4 is sent to the steam turbine generator set, and the condensed water is preheated by using the exhaust gas of the hot blast stove, that is, a condensed water heat exchanger is arranged on the condensed water pipeline, and the condensed water heat exchanger is connected to the exhaust gas pipe of the hot blast stove.
Further optimizing the structure of the blast furnace air blower unit, as shown in fig. 1, a second heat exchanger 7 is further arranged on the hot air pipeline, the second heat exchanger 7 is located between the first heat exchanger 6 and the hot air furnace 3, and the second heat exchanger 7 is connected with a cooling medium pipeline. The second heat exchanger 7 can be used as an emergency standby device to prevent the air temperature at the outlet of the first heat exchanger 6 from being too high, and the second heat exchanger 7 can adopt conventional cooling media such as circulating cooling water and the like, for example, the cooling media pipeline is connected with a circulating cooling water source. Further, a control valve may be provided on the cooling medium line to control whether the second heat exchanger 7 is put into operation; temperature measuring equipment can be arranged on a blast pipeline between the second heat exchanger 7 and the hot blast stove 3 or at an air inlet of the hot blast stove 3 to detect the inlet air temperature of the hot blast stove 3, so as to guide whether the second heat exchanger 7 is put into operation, the flow rate of circulating cooling water required by the second heat exchanger 7 and the like.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a hot-blast system that utilizes of blast furnace air-blower, includes the hot-blast furnace of being connected through hot-blast main and blower set, its characterized in that: the boiler is connected with a water supply pipeline, a hot medium inlet and outlet of the first heat exchanger are respectively connected with the hot air pipeline, and a cold medium inlet and outlet of the first heat exchanger are respectively connected with the water supply pipeline.
2. The blast furnace blower hot air utilization system according to claim 1, characterized in that: and a deaerator is arranged on the water supply pipeline, and a cold medium outlet of the first heat exchanger is communicated with a water inlet of the deaerator.
3. The blast furnace blower hot air utilization system according to claim 2, characterized in that: the water supply pipeline inlet end is connected with a water replenishing tank and a water replenishing pump is arranged on the water supply pipeline, and the water replenishing tank, the water replenishing pump and the first heat exchanger are sequentially connected with the deaerator along the water supply direction.
4. The blast furnace blower hot air utilization system according to any one of claims 1 to 3, characterized in that: and a second heat exchanger is also arranged on the hot air pipeline and is positioned between the first heat exchanger and the hot air furnace, and the second heat exchanger is connected with a cooling medium pipeline.
5. The blast furnace blower hot air utilization system according to claim 4, characterized in that: the cooling medium pipeline is connected with a circulating cooling water source.
6. The blast furnace blower hot air utilization system according to claim 1, characterized in that: the boiler is a blast furnace gas boiler.
7. The blast furnace blower hot air utilization system according to claim 1, characterized in that: the boiler is a waste heat boiler and is communicated with the smoke outlet of the hot blast stove.
8. The blast furnace blower hot air utilization system according to claim 1, characterized in that: the blower unit adopts an electric axial flow blower capable of performing multi-stage compression on air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920271956.3U CN209926342U (en) | 2019-03-04 | 2019-03-04 | Hot air utilization system of blast furnace blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920271956.3U CN209926342U (en) | 2019-03-04 | 2019-03-04 | Hot air utilization system of blast furnace blower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209926342U true CN209926342U (en) | 2020-01-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920271956.3U Active CN209926342U (en) | 2019-03-04 | 2019-03-04 | Hot air utilization system of blast furnace blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209926342U (en) |
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2019
- 2019-03-04 CN CN201920271956.3U patent/CN209926342U/en active Active
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