CN113502482A - Heating structure and heating process of pickling section of steel strip pickling line - Google Patents
Heating structure and heating process of pickling section of steel strip pickling line Download PDFInfo
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- CN113502482A CN113502482A CN202110570109.9A CN202110570109A CN113502482A CN 113502482 A CN113502482 A CN 113502482A CN 202110570109 A CN202110570109 A CN 202110570109A CN 113502482 A CN113502482 A CN 113502482A
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- 238000005554 pickling Methods 0.000 title claims abstract description 115
- 238000010438 heat treatment Methods 0.000 title claims abstract description 49
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 12
- 239000010439 graphite Substances 0.000 claims abstract description 12
- 239000003921 oil Substances 0.000 claims description 194
- 239000000243 solution Substances 0.000 claims description 45
- 239000002253 acid Substances 0.000 claims description 16
- 239000010724 circulating oil Substances 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052715 tantalum Inorganic materials 0.000 claims description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims 4
- 238000012546 transfer Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002737 fuel gas Substances 0.000 abstract description 7
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000011084 recovery Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 238000005097 cold rolling Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000010960 cold rolled steel Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/025—Details of the apparatus, e.g. linings or sealing means
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/02—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously
- C23G3/023—Apparatus for cleaning or pickling metallic material for cleaning wires, strips, filaments continuously by spraying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D9/00—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D9/04—Heat-exchange apparatus having stationary plate-like or laminated conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being formed by spirally-wound plates or laminae
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/02—Constructions of heat-exchange apparatus characterised by the selection of particular materials of carbon, e.g. graphite
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention belongs to the technical field of steel strip pickling, and particularly provides a heating structure and a heating process of a pickling section of a steel strip pickling line; the heat of the secondary high-temperature oil after heat exchange is fully recycled by adopting a secondary heat conduction oil closed circulation and pickling solution heat exchange mode, so that the problems of waste of condensed water heat after steam heat exchange and complex recovery system are solved; because the oil return heat of the heat conducting oil is fully recovered, only a small amount of fuel gas is needed to make up for the loss of heat exchange, and compared with steam heating, the fuel gas can be saved by more than 50%; the synthetic heat conduction oil is used as the heat medium, so that the service life of the heat medium is prolonged, high-quality desalted water which is required to be periodically supplemented to a boiler in the traditional steam heating process is saved, and meanwhile, the whole system is circulated at low pressure, so that the operation and maintenance are simple; the technical scheme of separately circulating the primary heat transfer oil and the secondary heat transfer oil is adopted, so that the safety risk possibly caused by leakage of the graphite heat exchanger is solved, and the risk when the leakage occurs is controlled in a small-range area.
Description
Technical Field
The invention belongs to the technical field of steel strip pickling, and particularly relates to a heating structure and a heating process of a pickling section of a steel strip pickling line.
Background
At present, before a steel strip enters a cold rolling process, the steel strip generally needs to be subjected to acid pickling treatment, because the steel strip is easy to oxidize in a humid environment, and a layer of thick oxide film is arranged on the surface of the steel strip, the finished product is obvious in color change, the quality and the attractiveness of the steel strip product are seriously affected, and the acid pickling is mainly used for effectively removing impurities on the surface of the steel strip. If the pickling of the steel strip is incomplete, on one hand, impurities are directly pressed into the surface of the steel strip in the manufacturing process, and the quality of a cold-rolled product is influenced; on the other hand, the roughness of the roll and the service life of the emulsion in the next cold rolling process are adversely affected. Therefore, the pickling step is important as a previous step of the cold rolling. In the existing cold rolling and pickling machine set, a pickling section generally adopts a heating mode that steam is used as a heating medium, and the heat of pickling solution and the steam is exchanged through a graphite heat exchanger, so that the aim of heating the pickling solution is fulfilled. However, the steam system is complex to start and stop, the requirement on water quality of boiler water replenishing is high, the recovery of condensed water after heat exchange is difficult, the condensed water system is complex, pipeline antifreezing needs to be considered in winter, the operation pressure must be increased for obtaining high-temperature steam, and the requirements on equipment maintenance and safe production are high. Although the heat transfer efficiency of the steam is high, there are problems of complicated operation management and low utilization rate of the secondary heat source, resulting in high overall production cost for users.
Therefore, the invention provides a heating process of a steel strip pickling line by adopting artificially synthesized heat conduction oil as a heat medium, which is characterized in that the heat conduction oil and the pickling solution are subjected to heat exchange through a heat exchanger to heat the pickling solution at the pickling section of the pickling line, so that a heating mode by taking steam as a heat medium is replaced, and the purposes of improving the heat utilization rate and reducing the gas consumption are realized.
Disclosure of Invention
The invention aims to overcome the problems of complex operation management and low utilization rate of a secondary heat source in the prior art.
Therefore, the invention provides a heating structure of a pickling section of a steel strip pickling line, which comprises the following components: a primary heat conduction oil system, a secondary heat conduction oil system and a pickling solution pressurization system; the primary heat conduction oil system is formed by sequentially connecting an oil supply port, an oil supply pipeline I, a heat exchanger I, an oil return pipeline I and an oil return port; the secondary heat conduction oil system is a closed circulation pipeline system formed by sequentially connecting a circulation oil pump, an oil supply pipeline II, a heat exchanger I, a heat exchange pipeline, a heat exchanger II and an oil return pipeline II; a communicating pipeline extends out of the oil return pipeline II, the communicating pipeline is connected with the oil supply port, and a valve is arranged on the communicating pipeline; the pickling solution pressurization system consists of a pickling solution inlet, an acid circulating pump, a heat exchanger II and an injection pipe which are sequentially connected through pipelines.
Specifically, a shunting-type three-way automatic regulating valve I is connected to the oil supply pipeline I, and a pipeline is connected between the shunting-type three-way automatic regulating valve I and the oil return pipeline I; a temperature sensor I is installed on the heat exchange pipeline close to the heat exchanger I, and forms an automatic temperature adjusting loop with the shunting type three-way automatic adjusting valve I.
Specifically, a shunting type three-way automatic adjusting valve II is connected to the heat exchange pipeline close to the heat exchanger II, and a pipeline is connected between the shunting type three-way automatic adjusting valve II and the oil return pipeline II; and a temperature sensor II is arranged on a pipeline between the injection pipe and the heat exchanger II, and forms an automatic temperature adjusting loop with the flow-dividing three-way automatic adjusting valve II.
Specifically, a pipeline filter is arranged on a suction inlet pipeline of the circulating oil pump, and an oil drainage pipeline is arranged on a discharge outlet pipeline.
Specifically, an expansion tank is arranged on the oil return pipeline II, and a liquid level abnormity alarm is arranged on the expansion tank.
Specifically, the expansion tank is of an open type, and a pipeline on the expansion tank is communicated with the atmosphere.
Specifically, the heat exchanger I is a spiral plate heat exchanger or a tube heat exchanger.
Specifically, the heat exchanger II is a graphite heat exchanger, and the oil supply temperature of the secondary heat conduction oil system is less than or equal to 180 ℃.
Specifically, the heat exchanger II is a tantalum heat exchanger, and the oil supply temperature of the secondary heat conduction oil system is less than or equal to 200 ℃.
The invention also provides a heating process of the pickling section of the steel strip pickling line, which comprises the following steps:
s1, preparing a heating structure of the pickling section of the steel strip pickling line according to any one of claims 1 to 9;
s2, when the device is used for the first time, opening the oil supply port and the valve on the communication pipeline, enabling high-temperature heat conduction oil to enter a secondary heat conduction oil system until a circulation pipeline and an expansion tank of the secondary heat conduction oil system are filled with the heat conduction oil, and closing the valve on the communication pipeline; during pickling production, the pickling solution enters a pickling solution pressurization system, and circularly exchanges heat with high-temperature heat conduction oil in a heat exchanger II, and the heated pickling solution enters a pickling tank through an injection pipe under the action of an acid circulating pump; the cooled heat conduction oil leaves the heat exchanger II and enters a circulating oil pump through an oil return pipeline II;
s3, after the secondary heat conduction oil system is filled, closing a valve of the communication pipeline to enable high-temperature heat conduction oil provided by the oil supply port to enter the primary heat conduction oil system only through the oil supply pipeline I; the heat conducting oil retained in the secondary heat conducting oil system is subjected to closed circulation in the secondary heat conducting oil system through a circulating oil pump, exchanges heat with high-temperature heat conducting oil in the primary heat conducting oil circulating system in a heat exchanger I, is conveyed to a heat exchanger II through the circulating oil pump, and continues to heat the pickling solution; after the high-temperature heat conduction oil in the primary heat conduction oil system is cooled in the heat exchanger I, the high-temperature heat conduction oil leaves the primary heat conduction oil circulation system through the oil return pipeline I and the oil return opening.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the heating structure of the pickling section of the steel strip pickling line provided by the invention adopts a mode of secondary heat conduction oil closed circulation and heat exchange of pickling solution, fully and circularly utilizes the heat of secondary high-temperature oil after heat exchange, and solves the problems of waste of condensed water heat after steam heat exchange and complex recovery system; because the oil return heat of the heat conducting oil is fully recovered, only a small amount of fuel gas is needed for heating to make up for the loss of heat exchange, and compared with steam heating, the fuel gas consumption can be saved by at least more than 50%; the synthetic heat conduction oil is used as the heat medium, so that the service life of the heat medium is prolonged, high-quality desalted water which is required to be periodically supplemented to a boiler in the traditional steam heating process is saved, and meanwhile, the whole system is circulated at low pressure, so that the operation and maintenance are simple; the technical scheme of separately circulating the primary heat transfer oil and the secondary heat transfer oil is adopted, so that the safety risk possibly caused by leakage of the graphite heat exchanger is solved, and the risk when the leakage occurs is controlled in a small-range area.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a heating structure of a pickling section of a steel strip pickling line according to the present invention.
Reference numerals: 1. an oil supply port; 2. an oil supply pipeline I; 3. a shunting type three-way automatic regulating valve I; 4. an oil return pipeline I; 5. an oil return port; 6. a communicating pipeline; 7. a valve; 8. a circulating oil pump; 9. an oil supply pipeline II; 10. a heat exchanger I; 11. a temperature sensor I; 12. a heat exchange line; 13. a shunting type three-way automatic regulating valve II; 14. an oil return pipeline II; 15. a pickling solution inlet; 16. an acid circulation pump; 17. a heat exchanger II; 18. a temperature sensor II; 19. an expansion tank; 20. an injection pipe; 21. a pickling tank.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Although representative embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that various modifications and changes may be made thereto without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited to the embodiments, but should be defined by the appended claims and equivalents thereof.
As shown in fig. 1, the present invention provides a heating structure of a pickling section of a steel strip pickling line, comprising: a primary heat conduction oil system, a secondary heat conduction oil system and a pickling solution pressurization system; the primary heat conduction oil system is formed by sequentially connecting an oil supply port 1, an oil supply pipeline I2, a heat exchanger I10, an oil return pipeline I4 and an oil return port 5; the secondary heat conduction oil system is a closed circulation pipeline system formed by sequentially connecting a circulation oil pump 8, an oil supply pipeline II 9, a heat exchanger I10, a heat exchange pipeline 12, a heat exchanger II 17 and an oil return pipeline II 14; a communicating pipeline 6 extends out of the oil return pipeline II 14, the communicating pipeline 6 is connected with the oil supply port 1, and a valve 7 is arranged on the communicating pipeline 6; the pickling solution pressurization system consists of a pickling solution inlet 15, an acid circulating pump 16, a heat exchanger II 17 and an injection pipe 20 which are sequentially connected through pipelines. When the heating structure works, the valve 7 is opened, heat conduction oil which enters a secondary heat conduction oil system for the first time through the communication pipeline 6 exchanges heat with low-temperature pickling solution which enters a pickling solution pressurization system in the heat exchanger II 17, and the heated pickling solution enters a pickling tank 21 through the acid circulating pump 16 and the injection pipe 20 to clean a cold-rolled steel strip; closing the valve 7 to ensure that the high-temperature heat conduction oil provided by the oil supply port enters the primary heat conduction oil system only through the oil supply pipeline I; and the heat conduction oil cooled after heat exchange in the secondary heat conduction oil system returns to the heat exchanger I10, is heated again by the high-temperature heat conduction oil in the primary heat conduction oil system, and is conveyed to the heat exchanger II 17 through the circulating oil pump 8, so that the pickling solution pumped in the pickling solution pressurization system subsequently is heated. The secondary heat conduction oil system is a closed circulation system, so that the heat conduction oil can continuously circulate in the secondary heat conduction oil system to heat the pickling solution which subsequently enters the pickling solution pressurization system; in addition, when the heating structure finishes working and needs to be emptied and overhauled, the valve 7 can be opened, and the heat conduction oil in the secondary heat conduction oil system is pumped away through the communicating pipeline 6 to overhaul the pipeline.
The heat conduction oil system generally circulates at a constant flow rate, so that a shunting type three-way automatic adjusting valve I3 is connected to an oil supply pipeline I2, and a pipeline is connected between the shunting type three-way automatic adjusting valve I3 and an oil return pipeline I4; and a temperature sensor I11 is arranged on the heat exchange pipeline 12 close to the heat exchanger I10. After the heat transfer, according to the temperature that temperature sensor I11 feedbacks, the heat conduction oil mass through heat exchanger I10 is adjusted to the aperture of I3 automatic adjustment valve of shunting tee bend, the conduction oil that does not flow through heat exchanger I10 then gets into oil return pipeline I4 through the pipeline reposition of redundant personnel that is connected between I3 of shunting tee bend automatic adjustment valve and the oil return pipeline I4, shunting tee bend automatic adjustment valve I3 and I11 constitution temperature automatic adjustment return circuit of temperature sensor to the heat conduction oil mass that flows through heat exchanger I10 in the heat conduction oil system of adjustment once. Similarly, a shunting type three-way automatic regulating valve II 13 is connected to the heat exchange pipeline 12 close to the heat exchanger II 17, and a pipeline is connected between the shunting type three-way automatic regulating valve II 13 and the oil return pipeline II 14; a temperature sensor II 18 is arranged on a pipeline between the injection pipe 20 and the heat exchanger II 17, and forms an automatic temperature adjusting loop with the shunt type three-way automatic adjusting valve II 13 so as to adjust the quantity of heat-conducting oil flowing through the heat exchanger II 17 in a secondary heat-conducting oil system and keep the constant temperature of the secondary heat-conducting oil supply.
Furthermore, a pipeline filter is arranged on a suction port pipeline of the circulating oil pump 8 to remove impurities mixed in the heat conduction oil, and an oil drainage pipeline is arranged on a discharge port pipeline of the circulating oil pump 8 to facilitate analysis and sampling of oil products of a secondary heat conduction oil system.
In order to stabilize the internal pressure of the secondary heat conduction oil system, an expansion tank 19 is arranged on the oil return pipeline II 14, and a liquid level abnormity alarm is arranged on the expansion tank 19; preferably, the expansion tank is of an open type, and a communication pipeline is arranged above the expansion tank and communicated with the atmosphere. When the heat exchanger II 17 leaks acid liquor, the expansion tank can quickly sense the liquid level change, and an abnormal liquid level alarm is sent to remind an operator to check and maintain the heat exchanger.
Specifically, the heat exchanger i 10 may be a spiral plate heat exchanger or a tube-and-tube heat exchanger. The heat exchanger II 17 can be a graphite heat exchanger or a tantalum heat exchanger, and when the heat exchanger II 17 is the graphite heat exchanger, the oil supply temperature of the secondary heat conduction oil system is less than or equal to 180 ℃; when the heat exchanger II 17 is a tantalum heat exchanger, the oil supply temperature of the secondary heat conduction oil system is less than or equal to 200 ℃.
In a detailed embodiment, as shown in fig. 1, the heating structure of the pickling section of the steel strip pickling line comprises two pickling solution pressurization systems, and heat transfer oil flowing out of the heat exchange pipeline 12 of the secondary heat transfer oil system is shunted to enter two heat exchangers ii 17 to heat pickling solutions in the two pickling solution pressurization systems; the heat conducting oil flowing out of the two heat exchangers II 17 is converged in the oil return pipeline II 14 and then circulated for the next time, and the heated pickling solutions are pressurized and respectively fed to the inlet injection pipe and the outlet injection pipe of the pickling tank 21 by the acid circulating pumps 16 in respective pickling solution pressurization systems so as to clean the cold-rolled steel strip.
In order to more fully and circularly utilize the heat of the heat-exchanged heat-conducting oil, a pipeline can be arranged between the oil return port 5 and the oil supply port 1, and a heating device is arranged on the pipeline to heat the heat-conducting oil after oil return. At the moment, only a small amount of heat is additionally provided by the heating device to make up the heat loss of the heat conduction oil in the heat exchange process, the heat conduction oil can carry out closed circulation in a primary heat conduction oil system and a secondary heat conduction oil system, the continuous heating of the pickling solution is realized, and compared with steam heating, the consumption of fuel gas can be saved by at least more than 50%.
The effect of the heating structure of the pickling section of the steel strip pickling line according to the present invention is examined by way of specific examples.
Example 1:
the embodiment provides a heating process of a pickling section of a steel strip pickling line, which comprises the following steps:
s1, building a heating structure of the pickling section of the steel strip pickling line, which comprises two pickling solution pressurization systems and is shown in figure 1; the heat exchanger I10 is a spiral plate heat exchanger, the heat exchanger II 17 is a graphite heat exchanger, the expansion tank 19 is in an open type, and a pipeline is arranged on the expansion tank 19 and leads to the atmosphere;
s2, when the device is used for the first time, opening the oil supply port 1 and the valve 7 on the communication pipeline 6 to enable heat conduction oil to enter a secondary heat conduction oil system; the pickling solution enters a pickling solution pressurization system through a pickling solution inlet 15, the pickling solution exchanges heat with high-temperature heat conduction oil in a graphite heat exchanger, the pickling solution is heated to 80-85 ℃, and the heated pickling solution enters a pickling tank 21 through an injection pipe 20 under the action of an acid circulating pump 16; the heat conducting oil with the temperature reduced to about 160 ℃ leaves the graphite heat exchanger and enters the oil return pipeline II 14;
s3, closing a valve 7 of the communication pipeline 6, and providing high-temperature heat conduction oil at the temperature of 200-; the heat conducting oil with the temperature of about 160 ℃ in the secondary heat conducting oil system is subjected to closed circulation in the secondary heat conducting oil system under the action of the circulating oil pump 8, and is heated to 170 ℃ by the high-temperature heat conducting oil in the primary heat conducting oil circulation system in the spiral plate heat exchanger, and then is conveyed to the graphite heat exchanger through the circulating oil pump 8 to continuously heat the pickling solution; after the high-temperature heat conduction oil in the primary heat conduction oil system is cooled in the spiral plate heat exchanger, the high-temperature heat conduction oil leaves the primary heat conduction oil circulation system through the oil return pipeline I4 and the oil return opening 5.
In conclusion, the heating structure of the pickling section of the steel strip pickling line provided by the invention adopts a mode of secondary heat conduction oil closed circulation and heat exchange of pickling solution, fully and circularly utilizes the heat of secondary high-temperature oil after heat exchange, and solves the problems of waste of condensed water heat after steam heat exchange and complex recovery system; because the oil return heat of the heat conducting oil is fully recovered, only a small amount of fuel gas is needed for heating to make up for the loss of heat exchange, and compared with steam heating, the fuel gas consumption can be saved by at least more than 50%; the synthetic heat conduction oil is used as the heat medium, so that the service life of the heat medium is prolonged, high-quality desalted water which is required to be periodically supplemented to a boiler in the traditional steam heating process is saved, and meanwhile, the whole system is circulated at low pressure, so that the operation and maintenance are simple; the technical scheme of separately circulating the primary heat transfer oil and the secondary heat transfer oil is adopted, so that the safety risk possibly caused by leakage of the graphite heat exchanger is solved, and the risk when the leakage occurs is controlled in a small-range area.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. The utility model provides a heating structure of steel band pickling line pickling section which characterized in that includes: a primary heat conduction oil system, a secondary heat conduction oil system and a pickling solution pressurization system; the primary heat conduction oil system is formed by sequentially connecting an oil supply port (1), an oil supply pipeline I (2), a heat exchanger I (10), an oil return pipeline I (4) and an oil return port (5); the secondary heat conduction oil system is a closed circulation pipeline system formed by sequentially connecting a circulation oil pump (8), an oil supply pipeline II (9), a heat exchanger I (10), a heat exchange pipeline (12), a heat exchanger II (17) and an oil return pipeline II (14); a communicating pipeline (6) extends from the oil return pipeline II (14), the communicating pipeline (6) is connected with the oil supply port (1), and a valve (7) is arranged on the communicating pipeline (6); the pickling solution pressurization system consists of a pickling solution inlet (15), an acid circulating pump (16), a heat exchanger II (17) and an injection pipe (20) which are sequentially connected through pipelines.
2. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: a shunting type three-way automatic regulating valve I (3) is connected to the oil supply pipeline I (2), and a pipeline is connected between the shunting type three-way automatic regulating valve I (3) and the oil return pipeline I (4); a temperature sensor I (11) is installed on the heat exchange pipeline (12) close to the heat exchanger I (10), and an automatic temperature adjusting loop is formed by the split-flow three-way automatic adjusting valve I (3).
3. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: a shunting type three-way automatic adjusting valve II (13) is connected to the heat exchange pipeline (12) close to the heat exchanger II (17), and a pipeline is connected between the shunting type three-way automatic adjusting valve II (13) and the oil return pipeline II (14); and a temperature sensor II (18) is arranged on a pipeline between the injection pipe (20) and the heat exchanger II (17), and forms an automatic temperature adjusting loop with the split-flow three-way automatic adjusting valve II (13).
4. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: and a pipeline filter is arranged on a suction inlet pipeline of the circulating oil pump (8), and an oil drainage pipeline is arranged on a discharge outlet pipeline.
5. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: an expansion tank (19) is arranged on the oil return pipeline II (14), and a liquid level abnormity alarm is arranged on the expansion tank (19).
6. The heating structure of the pickling section of the steel strip pickling line according to claim 5, characterized in that: the expansion tank (19) is of an open type, and a pipeline on the expansion tank (19) is communicated with the atmosphere.
7. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: the heat exchanger I (10) is a spiral plate heat exchanger or a tubular heat exchanger.
8. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: the heat exchanger II (17) is a graphite heat exchanger, and the temperature of oil supply in the secondary heat conduction oil system is less than or equal to 180 ℃.
9. The heating structure of the pickling section of the steel strip pickling line according to claim 1, characterized in that: the heat exchanger II (17) is a tantalum heat exchanger, and the temperature of oil supplied in the secondary heat conduction oil system is less than or equal to 200 ℃.
10. A heating process of a pickling section of a steel strip pickling line is characterized by comprising the following steps:
s1, preparing a heating structure of the pickling section of the steel strip pickling line according to any one of claims 1 to 9;
s2, when the device is used for the first time, opening the oil supply port (1) and the valve (7) on the communicating pipeline (6) to enable high-temperature heat conduction oil to enter a secondary heat conduction oil system until a circulating pipeline and an expansion tank of the secondary heat conduction oil system are filled with the heat conduction oil, and closing the valve (7) on the communicating pipeline (6); during acid washing production, acid washing liquid enters an acid washing liquid pressurization system through an acid washing liquid inlet (15); the pickling solution and high-temperature heat conducting oil perform circulating heat exchange in a heat exchanger II (17), and the heated pickling solution enters a pickling tank (21) through an injection pipe (20) under the action of an acid circulating pump (16); the cooled heat conduction oil leaves the heat exchanger II (17) and enters an oil return pipeline II (14);
s3, closing a valve (7) of a communication pipeline (6) to enable high-temperature heat conduction oil provided by an oil supply port (1) to enter a primary heat conduction oil system only through an oil supply pipeline I (2); the residual heat conduction oil in the secondary heat conduction oil system is subjected to closed circulation in the secondary heat conduction oil system under the action of a circulating oil pump (8), exchanges heat with high-temperature heat conduction oil in the primary heat conduction oil circulation system in a heat exchanger I (10), is conveyed to a heat exchanger II (17) through the circulating oil pump, and continues to heat the pickling solution; high-temperature heat conduction oil in the primary heat conduction oil system is cooled in the heat exchanger I (10) and then leaves the primary heat conduction oil circulation system through the oil return pipeline I (4) and the oil return opening (5).
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| CN107740129A (en) * | 2017-11-30 | 2018-02-27 | 中冶南方工程技术有限公司 | The heating system of strip pickling acid |
| CN108168102A (en) * | 2017-12-04 | 2018-06-15 | 新奥泛能网络科技股份有限公司 | High-temperature heating equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1738727A (en) * | 2002-07-16 | 2006-02-22 | 丰田自动车株式会社 | A/c system |
| CN107189806A (en) * | 2017-07-07 | 2017-09-22 | 上海锦泥环境技术有限公司 | A kind of batch-type biomass liquefying process |
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Application publication date: 20211015 |