CN111906154B - Water-saving method for accelerated cooling process after rolling of medium plate - Google Patents
Water-saving method for accelerated cooling process after rolling of medium plate Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 title claims abstract description 77
- 238000005096 rolling process Methods 0.000 title claims abstract description 39
- 230000008569 process Effects 0.000 title claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 139
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 70
- 239000010959 steel Substances 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 229910045601 alloy Inorganic materials 0.000 claims description 10
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- 230000008520 organization Effects 0.000 claims description 4
- 238000010923 batch production Methods 0.000 abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
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- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- 230000009467 reduction Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 230000033764 rhythmic process Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
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Abstract
The invention provides a water-saving method for an accelerated cooling process after rolling of a medium plate, and belongs to the technical field of cooling in steel rolling production. According to the method, a steel plate with the thickness of 6-120mm after finish rolling is conveyed to a pre-straightening machine for straightening through a conveying roller way, the steel plate enters an online accelerated cooling area to be rapidly cooled to 250-720 ℃ at the temperature of 700-950 ℃, the temperature of the steel plate is measured after the steel plate is cooled to be uniform, and the steel plate is conveyed to a cooling bed through the straightening machine. The invention adopts a combined process mode to realize water saving, and comprises the steps of adopting a low-temperature rolling and low-temperature cooling system, utilizing the characteristic of high low-temperature cooling efficiency to realize water saving by adopting methods of preferentially arranging nights or adopting discontinuous batch production arrangement aiming at high-cooling-strength varieties, increasing the bottom area of a high-level water tank to store water, adopting variable-frequency control low-frequency operation and the like. The steel plate produced by the method of the invention meets the use requirements of structure, performance and shape.
Description
Technical Field
The invention relates to the technical field of cooling in steel rolling production, in particular to a water-saving method for an accelerated cooling process after rolling of a medium plate.
Background
The metallurgical industry mainly comprises water-saving key technology development of typical procedures in the production process of iron and steel, such as pre-iron, steel making, steel rolling and the like. The method mainly aims at advanced applicable complete sets of industrialization technology, full-flow comprehensive application demonstration and universal technical specification files which need to be solved for developing green steel in China, and comprehensively and systematically perfects the water pollution full-process control technical system and comprehensive application in the steel industry in China through researches such as a water pollution full-process pollution control strategy in the steel industry, water saving in typical procedures in the steel production process, quality-based/graded water supply and water network intelligent management, deep treatment and reuse of waste water, secondary pollution prevention and control and the like.
Steel metallurgy enterprises consume a large amount of water in the rolling process, such as water for descaling with high pressure water, water for intermediate cooling in differential temperature rolling, water for cooling rolls, water for controlled cooling after rolling, water for cooling roller tables, and water for subsequent heat treatment such as quenching machines and normalizing cooling. Water consumption is increasingly becoming an important energy medium consumption in steel rolling procedures of metallurgical enterprises, and brings about greater production cost for the enterprises. Therefore, how to save water, reduce water consumption and improve market competitiveness through energy conservation and consumption reduction has become a problem that enterprises must research and solve. The medium plate factory mainly takes low alloy steel Q345, pipeline steel (such as X70 and X80) and high-strength structural steel (such as Q550 and Q690) as main water-saving research objects.
At present, no patent about the aspect of accelerated cooling and water saving after rolling of a medium plate in a steel rolling process is seen. Li Feng Zheng 'research and application of measures for reducing energy and consumption in steel rolling process' journal paper mentions that new water consumption per ton of steel in steel enterprises is further reduced, the repeated utilization rate of water in the steel enterprises is improved, technological equipment with little or no water needs to be actively popularized, energy conservation and consumption reduction are realized, and sustainable development is realized. By optimizing a water supply network system, cascade precipitation circulation is implemented, a water supply pump set and the like are reduced, the pressure of cooling water of a rolling line is improved, the water quality is improved, the comprehensive utilization rate of water is improved, and the like.
Therefore, the water-saving significance in the process flow of the steel rolling process is extremely important. The water saving of the accelerated cooling after the medium plate is rolled mainly comprises water saving strategies in the aspects of process, equipment, control and the like. The invention develops a water-saving method for the accelerated cooling process after medium plate rolling, which can generate great economic benefit and social benefit and has great popularization value in the domestic medium plate production line.
Disclosure of Invention
The invention aims to provide a water-saving method for an accelerated cooling process after rolling of a medium plate. The water saving is realized by adopting a combined process mode, the method comprises the steps of adopting a low-temperature rolling and low-temperature cooling system, utilizing the characteristic of high low-temperature cooling efficiency to realize water saving by adopting methods of preferentially arranging nights or adopting discontinuous batch production arrangement aiming at high-cooling-strength varieties, increasing the bottom area of a high-level water tank for storing water, adopting variable-frequency control low-frequency operation and the like, and the comprehensive water saving is about more than or equal to 15 percent.
The method comprises the following basic steps: firstly, a steel plate with the thickness range of 6-120mm after finish rolling is conveyed to a pre-straightening machine for pre-straightening by a conveying roller way, then the steel plate enters an online accelerated cooling device for accelerated cooling while being pre-straightened, the temperature of the steel plate with the temperature of 700 plus 950 ℃ is rapidly cooled to the temperature of 250 plus 720 ℃ by an upper cooler and a lower cooler through ultra-density spraying, and finally the temperature of the steel plate is measured after cooling and temperature equalization and is conveyed to a cooling bed by a straightening machine. In the concrete operation, the comprehensive water saving of accelerated cooling after the medium plate is rolled is more than or equal to 15 percent by the combination of more than two processes of reducing Ni, Mo and the like in the chemical components of the alloy, changing the cooling production organization of high-cooling-strength variety, increasing the bottom area of a high-level water tank and changing the process conditions of water supply variable frequency control.
The method specifically comprises the following steps of reducing Ni and Mo in the chemical components of the alloy: reducing 0.1-0.2% of Ni and 0.2-0.3% of Mo in the chemical components of the alloy, reducing the cooling-accelerating cooling-starting temperature after rolling by 30-50 ℃, and saving water by 6-10% on average;
changing a cooling system of high-cooling variety into that the high-cooling-strength variety is continuously cooled at intervals of M minutes after continuously cooling N blocks, and realizing average water saving of 4-6%, wherein N is less than or equal to 20, and M is more than or equal to 30.
The changing of the cooling system of the high-cooling variety also comprises the step of arranging the high-cooling-strength variety for night production, and the cooling efficiency is improved by utilizing the lower water temperature at night than in the daytime, so that the water is saved by 3-5% on average.
The increase of the bottom area of the high-level water tank is characterized in that the average water saving is 2-4 percent when the bottom area of the existing high-level water tank is increased by 10 percent.
The water supply variable frequency control process condition is changed, specifically, the frequency of the non-water state is adjusted from conventional 15Hz to 5-10Hz, and the average water saving is realized by 3-5%.
The on-line accelerated cooling of the medium plate is a water consumer of the steel rolling process of the medium plate, and generally comprises about 20 groups of upper and lower cooling headers, and the instantaneous flow rate is about 10000m3The high cooling strength variety has large water consumption due to high cooling speed and high phase change temperature reduction. The water saving significance of the steel industry is great. The alloy composition optimization can not only improve the performance of the variety, but also realize the processes of low-temperature heating, low-temperature rolling and low-temperature cooling, and realize the aim of saving water, and the water can be saved by about 10 percent when the cooling temperature is reduced by 50 DEG C. In addition, the water temperature is used as an important process parameter in the cooling control process, the heat exchange and cooling efficiency of the molten steel is improved by nearly 10% when the water temperature is reduced by 5 ℃, the water saving can be realized due to the improvement of the cooling efficiency, the characteristic that the water temperature is 3-5 ℃ lower than that in the daytime at night is fully utilized to organize the high-cooling-strength variety with larger water consumption for production, meanwhile, the circulating return water temperature is increased by nearly 3-5 ℃ in 1 hour of continuous production aiming at the high-cooling-strength variety with larger water consumption, and the cooling efficiency is greatly reduced, so that the cooling efficiency is greatly improved and the water is saved by adopting a continuous batch cooling control production mode, an intermittent non-cooling control mode and a continuous batch production mode. Finally, water can be saved by aiming at the frequency conversion control of the water supply end and the optimization of relevant process parameters of the high-level water tank, the waste of water in the non-working state can be saved by reducing the operating frequency in the non-working state of the frequency conversion control, the bottom area of the high-level water tank can be increased, the volume of a water supply storage can be increased, the total water supply flow of a frequency conversion pump and the frequency converter starting and stopping times can be reduced, and the water saving is realized.
The technical scheme of the invention has the following beneficial effects:
the invention adopts a combined process mode to realize water saving, comprises the steps of adopting a low-temperature rolling and low-temperature cooling system, utilizing the characteristic of high low-temperature cooling efficiency to realize water saving by adopting methods of preferentially arranging nights or adopting discontinuous batch production arrangement aiming at high-cooling-strength varieties, increasing the bottom area of a high-level water tank to store water, adopting variable-frequency control low-frequency operation and the like, and the comprehensive water saving is about equal to or more than 15 percent. The method has the following specific advantages:
(1) the chemical compositions of the alloys such as Ni, Mo and the like are reduced, the process system of low-temperature heating, low-temperature rolling and low-temperature cooling is realized, and water is saved;
(2) the characteristics of cooling efficiency are influenced around the change of water temperature, and high-cooling-strength varieties are preferentially produced at night;
(3) the cooling efficiency characteristic is influenced around the change of the water temperature, and the varieties with high cooling strength are produced in batch discontinuously;
(4) the bottom area of the high-level water tank is increased, and the water supply flow of the variable frequency pump and the starting and stopping times of the variable frequency pump are reduced;
(5) the running frequency of a converter in a non-water state is reduced, and water saving is realized;
(6) the combined process mode is adopted to realize the comprehensive water saving of accelerated cooling after the medium plate is rolled, which is more than or equal to 15 percent.
Drawings
FIG. 1 is a schematic diagram of the structure involved in the on-line accelerated cooling process of the present invention;
FIG. 2 is a schematic view of the on-line accelerated cooling temperature measurement and header opening of the present invention;
FIG. 3 is a schematic view of the present invention for increasing the floor area of a flush tank, wherein (a) is before modification and (b) is after modification.
The method comprises the following steps of 1-pre-straightening, 2-accelerated cooling input roller way, 3-online accelerated cooling device, 4-accelerated cooling output roller way, 5-powerful straightening machine, 6-controlled cooling steel plate, 7-measurement start cooling temperature pyrometer, 8-lower cooler, 9-upper cooler, 10-measurement final cooling temperature pyrometer, 11-high water tank, 12-original high water tank bottom surface and 13-modified high water tank bottom surface.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a water-saving method for an accelerated cooling process after rolling of a medium plate.
As shown in figure 1, the method comprises the steps of firstly conveying a steel plate with the finish rolling thickness range of 6-120mm to a pre-straightening machine 1 for pre-straightening through a conveying roller way, then entering an online accelerated cooling device 3 for accelerated cooling while the steel plate is pre-straightened, rapidly cooling the steel plate with the temperature of 700-950 ℃ to the temperature of 250-720 ℃ through an upper super-density spray cooler 9 and a lower cooler 8, and finally measuring the temperature of the steel plate after cooling and temperature equalization and conveying the steel plate to a cooling bed through a straightening machine.
The invention adopts a combined process mode, and can realize the comprehensive water saving of accelerated cooling after rolling the medium plate by more than or equal to 15 percent. The specific process method comprises the following steps: the method reduces the starting cooling temperature by reducing about 0.1 to 0.2 percent of Ni and 0.2 to 0.3 percent of Mo and other alloy chemical compositions, preferentially arranges the production of high cooling strength varieties under the condition of low water temperature at night, adopts the non-continuous high cooling strength varieties to control the cooling, increases the bottom area of the high-level water tank and operates at the low frequency of the converter in the non-water state.
The invention realizes low-temperature rolling and low-temperature cooling system by reducing about 0.1-0.2% of Ni and 0.2-0.3% of Mo and other alloy chemical components, the cooling-accelerating temperature after rolling is reduced by 30-50 ℃, and the average water is saved by about 6-10%. The specific method comprises the following steps: the chemical components are optimized, and the heating tapping temperature, the rolling temperature and the opening and cooling temperature are all reduced by 30-50 ℃ to realize water saving.
The invention adopts a high-cooling-strength variety, and continuously cools N blocks (N is less than or equal to 20) at intervals of M minutes (M is more than or equal to 30), thereby saving water by about 4-6% on average. The specific method comprises the following steps: taking Q690 high-strength steel with large water consumption as an example, the rolling rhythm is about 150s, after 20 pieces of steel are continuously cooled for about 50 minutes and the water temperature is increased for about 3-4 ℃, other varieties with less water consumption or without controlled cooling are arranged to be produced, the Q690 high-strength steel is organized and produced after 40 minutes, and the water temperature is recovered to the state when the Q690 high-strength steel is produced for the first time.
The invention adopts the high-cooling-strength variety to preferentially arrange the night production, and utilizes the mode that the water temperature at night is lower than that at daytime to improve the cooling efficiency, thereby saving about 3-5 percent of water on average. The specific method comprises the following steps: taking Q690 high-strength steel with large water consumption for production as an example, the water temperature is 3-5 ℃ lower than that in the daytime at night, and the number of cooling control sets is less by 1-2 sets.
The invention increases the bottom area of the existing high-level water tank, and the average water saving is about 2-4% when the bottom area is increased by 10%. The specific method comprises the following steps: the bottom area of the high-level water tank is 140m2Volume 280m3For example, the floor area of the high-level cistern is increased by 28m by appropriate modification2The volume is increased by 20 percent, and water saving can be realized.
The frequency of the non-water state under the water supply variable frequency control process condition is adjusted to 5-10Hz from the conventional 15Hz, and the water is saved by about 3-5% on average. The specific method comprises the following steps: the frequency is usually 15Hz under the original non-water state, the water waste is large at the moment, and the water can be saved by reducing the running frequency such as 10 Hz.
The following description is given with reference to specific examples.
Example 1
Taking the production of Q690D steel plate with a thickness of 30mm as an example, the length of the steel plate is 13m, and the application technology of the online accelerated cooling process arranged as the figure 1 is taken as an example to further describe the process method. The steel plate is sent into a pre-straightening machine 1 by a conveying roller way for pre-straightening, and is input into an online accelerated cooling device 3 by an online accelerated cooling input roller way 2, as shown in figure 2, the temperature of a controlled cooling steel plate 6 is 768 ℃ measured by a measuring opening temperature pyrometer 7, the steel plate does not contain Ni and Mo, the steel plate is cooled by opening 12 groups of lower coolers 8 and upper coolers 9, and the temperature of the controlled cooling steel plate 6 is 310 ℃ measured by a measuring final cooling temperature pyrometer 10. And after the controlled cooling is finished, the steel plate enters a powerful straightener 5 for straightening through an accelerated cooling output roller way 4. When the temperature of the controlled cooling steel plate 6 measured by a high temperature measuring instrument 7 is 810 ℃ by adopting another process, the steel plate contains 0.19 percent of Ni and 0.29 percent of Mo, and 14 groups of lower coolers 8 and upper coolers 9 are required to be started for cooling to the same final cooling temperature. The cooling temperature is reduced by 42 ℃, the water in 2 groups is reduced by controlling the cooling, and the water is saved by about 8 percent.
Example 2
Taking the production of a Q550D steel plate with a thickness of 28mm as an example, the length of the steel plate is 15m, and the application technology of the online accelerated cooling process arranged as the figure 1 is taken as an example to further describe the process method. The production is arranged at night when the water temperature is 20 ℃, the steel plate is sent to a pre-straightening machine 1 by a conveying roller way for pre-straightening, and is input to an online accelerated cooling device 3 by an online accelerated cooling input roller way 2, as shown in figure 2, the temperature of a controlled cooling steel plate 6 is 788 ℃ measured by a measuring start-cooling temperature pyrometer 7, the controlled cooling steel plate 6 is cooled by opening 10 groups of lower coolers 8 and upper coolers 9, and the temperature of the controlled cooling steel plate 6 is 490 ℃ measured by a measuring final-cooling temperature pyrometer 10. And after the controlled cooling is finished, the steel plate enters a powerful straightener 5 for straightening through an accelerated cooling output roller way 4. The same start-cooling temperature and end-cooling temperature are set when the production water temperature is 25 ℃ in the daytime, and 11 groups of lower coolers 8 and upper coolers 9 are required to be started for cooling. The water temperature is reduced by 5 ℃, the cold control is carried out, and less 1 group of water is started, so that the water is saved by about 4 percent.
Example 3
Taking the production of 22mm thick X80 steel plate with a length of 15m as an example, the application technique of the on-line accelerated cooling process arranged as shown in fig. 1 is used as an example to further describe the process method. The production rhythm is 150s, the water temperature is 25 ℃ before the start of controlled cooling, the steel plate is sent to a pre-straightening machine 1 by a transmission roller way for pre-straightening, and is input to an online accelerated cooling device 3 by an online accelerated cooling input roller way 2, as shown in figure 2, the temperature of the controlled cooling steel plate 6 is 782 ℃ measured by a measuring start-cooling temperature pyrometer 7, the controlled cooling steel plate is cooled by opening 13 groups of lower coolers 8 and upper coolers 9, and the temperature of the controlled cooling steel plate 6 is 380 ℃ measured by a measuring final-cooling temperature pyrometer 10. And after the controlled cooling is finished, the steel plate enters a powerful straightener 5 for straightening through an accelerated cooling output roller way 4. After 15 pieces of steel are continuously arranged and produced, the water temperature is increased to 28 ℃, 14 groups of steel are required to be started at the same start-cooling and final-cooling temperatures, then the plain carbon steel which does not need to be controlled in cooling is arranged and produced for 45 minutes, and the water temperature is reduced to 25 ℃ to rearrange and produce X80. By the method, 1 group of water is reduced, and the water is saved by about 5%.
Example 4
As shown in FIG. 3, the bottom area of the bottom surface 12 of the original flush tank 11 is 140m2The bottom area of the bottom surface 13 of the improved high-level water tank is 154m through improvement2The height of the high-level water tank is unchanged, the volume is increased by 10%, the flow of a pump station is reduced by 3%, and the water is saved by about 3%. Meanwhile, the frequency of the non-water state under the water supply variable frequency control process condition is adjusted to 10Hz from the conventional 15Hz, and the average water saving is about 3 percent.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (2)
1. A water-saving method for an accelerated cooling process after rolling of a medium plate comprises the following cooling steps:
(1) conveying the steel plate with the finish rolling thickness range of 6-120mm to a pre-straightening machine for pre-straightening through a conveying roller way;
(2) the steel plate is pre-straightened and is cooled in an on-line accelerated cooling device at the same time, and the temperature of the steel plate at 700-950 ℃ is rapidly cooled to 250-720 ℃ through an upper cooler and a lower cooler of the ultra-density jet;
(3) after cooling and temperature equalization, measuring the temperature of the steel plate and conveying the steel plate to a cooling bed through a straightener;
the method is characterized in that: the comprehensive water saving of accelerated cooling after rolling of the medium plate is more than or equal to 15 percent by the combination of more than two processes of reducing Ni and Mo in alloy chemical components, changing cooling production organization of high-cooling-strength variety, increasing the bottom area of a high-level water tank and changing water supply variable frequency control process conditions;
the method for reducing Ni and Mo in the alloy comprises the following specific steps: reducing 0.1-0.2% of Ni and 0.2-0.3% of Mo in the chemical components of the alloy, reducing the cooling-accelerating cooling-starting temperature after rolling by 30-50 ℃, and saving water by 6-10% on average;
the process condition for changing the water supply variable frequency control is specifically that the frequency of the non-water state is adjusted to 5-10Hz from the conventional 15Hz, and the average water saving is realized by 3-5%;
the cooling production organization for changing the high-cooling-strength variety is that the high-cooling-strength variety is continuously cooled at intervals of M minutes after continuously cooling N blocks, so that the average water saving is realized by 4-6%, wherein N is less than or equal to 20, and M is greater than or equal to 30;
the cooling production organization for changing the high-cooling-strength variety also comprises the step of arranging the high-cooling-strength variety for night production, and the cooling efficiency is improved by utilizing the lower water temperature at night than in the daytime, so that the water is saved by 3-5% on average.
2. The water-saving method for the accelerated cooling process after rolling the medium plate according to claim 1, which is characterized in that: the increase of the bottom area of the high-level water tank is characterized in that the average water saving is 2-4% when the bottom area of the existing high-level water tank is increased by 10%.
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| CN204429866U (en) * | 2015-01-09 | 2015-07-01 | 中冶南方工程技术有限公司 | A kind of medium plate cooling after rolling system |
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