CN211546675U - Low-acid-consumption and low-iron-loss acid washing group for combined-row combined compensation - Google Patents
Low-acid-consumption and low-iron-loss acid washing group for combined-row combined compensation Download PDFInfo
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- CN211546675U CN211546675U CN201922109875.6U CN201922109875U CN211546675U CN 211546675 U CN211546675 U CN 211546675U CN 201922109875 U CN201922109875 U CN 201922109875U CN 211546675 U CN211546675 U CN 211546675U
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Abstract
The utility model discloses a low-acid-consumption and low-iron-loss pickling group with combined drainage and compensation, which comprises a first acid tank, a second acid tank, a third acid tank, a fourth acid tank, a first circulating tank, a second circulating tank, a third circulating tank and a fourth circulating tank; acid liquor circulation exists between the acid tanks and the circulation tanks with the same labels, and the acid liquor circulation comprises a large pickling circulation and a small pickling circulation; the fourth circulating tank is connected with the acid adding passage through an acid valve, and the first circulating tank is connected with the acid discharging passage through an acid valve; a liquid level meter is arranged in each circulation tank; a conductivity meter is arranged between the first circulating tank and the acid valve of the acid discharging passage; and a conductivity meter is arranged between the fourth circulation tank and the acid valve of the acid inlet passage. Compared with the prior art, the acid consumption can be reduced on the basis of effective acid washing.
Description
Technical Field
The utility model relates to a steel production device, in particular to a pickling group with low acid consumption and low iron loss, which is suitable for the joint compensation of the hot-rolled coil in the pickling operation.
Background
Pickling of steel is a pre-process necessary for surface treatment of strip steel such as galvanized steel and coated steel, and is used for removing scale on the surface of hot-rolled raw material. The traditional pickling equipment guarantees the pickling effect of the strip steel by controlling the concentration of hydrochloric acid and temperature parameters of pickling. In order to ensure effective pickling effect, new acid is continuously supplemented into the acid tank under the condition of ensuring a certain pickling temperature, and the last acid tank is used for discharging low-concentration waste acid. The traditional equipment controls the waste acid discharge when the new acid supply amount per hour and the free acid concentration of the last acid tank are lower than 45g/L, the acid liquid concentration is detected once every 4 hours, and generally the ton steel acid consumption of the current production line of the acid-washing temper mill is 80-90L/t. Because the ESP production line technology is successfully developed, the thickness of the hot rolling raw material is expanded to 0.8-4.0mm from a thick plate with the thickness of more than 2.0mm of the existing equipment, two new technical problems appear in the pickling process: the relationship between the acid consumption of each ton of steel and the thickness of strip steel is that the thinner the strip steel is, the larger the area of an iron oxide scale of each ton of steel is, and the more the acid consumption of each ton of steel is; secondly, the upper limit of the maximum pickling speed of the pickling section of the production line is increased from 280m/min to 400m/min of common equipment, and the pickling line is suitable for producing thin hot rolling raw materials with the thickness of less than 2.0mm and improves the production efficiency. Therefore, in the existing pickling process, the acid consumption is too high when the speed is increased, so that the acid is not supplemented timely, the acid concentration is insufficient, and the pickling effect of the strip steel is influenced. However, the span of the ESP thickness range of 0.8-4.0mm is too large, and the increase of the new pickling circulation amount can cause the unconcerned acid consumption loss in the thick plate pickling operation.
In the existing work, the production of the large-span thickness is mainly judged, operated and controlled by manpower: an operator supplies acid according to the thickness specification of the strip steel in a production plan, and simultaneously looks at the pickling effect of the surface of the strip steel, generally, the pickling effect is ensured by supplying 8-10L of new acid per 100 tons of steel, and simultaneously, the acid adding and the acid discharging are carried out by referring to the detection result of the concentration of the acid liquor which is sent to be detected every 4 hours. The artificial acid supply causes the cost of acid consumption to be increased, and the process is corrected by results through manual calculation, so that the low-start pickling effect cannot be ensured, and the high-start causes huge waste in the feedback process. Therefore, for the hot rolling raw materials in the large span thickness range, under the condition of ensuring the stable production of the acid washing effect of the strip steel, how to reduce the cost by reducing the consumption of acid is a long-term critical goal.
SUMMERY OF THE UTILITY MODEL
The technical task of the utility model is to provide a low acid loss pickling group with low iron loss for combined drainage and combined compensation aiming at the defects of the prior art. The device is based on the traditional pickling equipment, and the liquid level of the circulating tank and the conductivity of the acid liquor are controlled to be reasonably used to reduce pickling acid loss and pickling iron loss through the combined drainage and combined compensation of waste acid and fresh acid.
The technical proposal of the utility model for solving the technical problem is that: the utility model provides a low acid consumption low iron loss pickling group of combined row's allies oneself with benefit which characterized in that: comprises a first acid tank, a second acid tank, a third acid tank, a fourth acid tank, a first circulating tank, a second circulating tank, a third circulating tank and a fourth circulating tank; acid liquor circulation exists between the acid tanks and the circulation tanks with the same labels, the acid liquor circulation comprises a large pickling circulation and a small pickling circulation, and the large pickling circulation is that the acid liquor in the circulation tanks is heated by a graphite heater through a pump and a pipeline and then pumped into the corresponding acid tanks and then returns to the circulation tanks from the acid tanks; the small pickling circulation is that the acid liquor in the circulation tank is heated by a graphite heater through a pump and a pipeline, does not pass through an acid tank, and directly returns to the circulation tank from another pipeline; the fourth circulating tank, the third circulating tank, the second circulating tank and the first circulating tank are connected in series through a pipeline with an acid valve; the fourth circulating tank is connected with the acid adding passage through an acid valve, and the first circulating tank is connected with the acid discharging passage through an acid valve; a liquid level meter is arranged in each circulation tank; a conductivity meter is arranged between the first circulating tank and the acid valve of the acid discharging passage; and a conductivity meter is arranged between the fourth circulation tank and the acid valve of the acid inlet passage.
The pickling tanks are separated from each other by a pair of acid squeezing rollers.
The acid liquor circulation between the first acid tank and the first circulation tank is as follows: the acid outlet of the first circulating tank is connected with the acid inlet of the first acid tank through an acid outlet channel, and the acid outlet of the first acid tank is connected with the acid inlet of the first circulating tank through a pipeline with an acid discharge valve; the acid outlet channel is as follows: an acid outlet of the first circulating tank enters a first acid tank through a pickling pump and a graphite heater through a pipeline, and an acid supplementing valve is arranged between the graphite heater and the first acid tank; an acid washing small circulation branch is arranged between the graphite heater and the acid supplementing valve and is connected with an acid inlet of the first circulation tank through the small circulation valve. An acid washing large circulation branch is additionally arranged between the acid washing pump of the acid outlet channel and the graphite heater and connected with the acid inlet of the first acid tank, and the graphite heater is arranged on the acid washing large circulation branch.
The acid liquor circulation between the second acid tank and the second circulation tank is as follows: the acid outlet of the second circulating tank is connected with the acid inlet of the second acid tank through an acid outlet channel, and the acid outlet of the second acid tank is connected with the acid inlet of the second circulating tank through a pipeline with an acid discharge valve; the acid outlet channel is as follows: the acid outlet of the second circulation tank enters a second acid tank through a pickling pump and a graphite heater through a pipeline, an acid supplementing valve is arranged between the graphite heater and the second acid tank, and a pickling small circulation branch is arranged between the graphite heater and the acid supplementing valve and is connected with the acid inlet of the second circulation tank through a small circulation valve. An acid washing large circulation branch is additionally arranged between the acid washing pump of the acid outlet channel and the graphite heater and is connected with an acid inlet of the second acid tank. The graphite heaters in the acid outlet channel are connected in parallel in two ways.
The connection relationship between the third circulation tank and the third acid tank and between the fourth circulation tank and the fourth acid tank is the same as the connection relationship between the second circulation tank and the second acid tank.
Compared with the prior art, the utility model discloses following outstanding beneficial effect has:
1. the equipment is suitable for hot rolling raw materials with the thickness range of 0.8-4.0mm, the raw materials in the range can be effectively pickled, and the upper limit of the maximum effective pickling speed of the sheet can reach 400 m/min;
2. the combined arrangement and compensation reduces the workload of manual measurement, simplifies the working procedure and reduces the labor cost;
3. the equipment reduces the steel acid consumption from the existing 80-90L/T level to 55-70L/T, the pickling iron loss is effectively reduced, and the average ton steel acid consumption is reduced by 20L/T.
Drawings
Fig. 1 is a schematic diagram of the structure of the present invention.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
The utility model discloses a low acid consumption low iron loss pickling group of allied oneself with tonifying is based on the pickling leveling machine group among the prior art, mends through allied oneself with the antithetical couplet under the condition of guaranteeing belted steel pickling effect, and control circulation tank liquid level, acidizing fluid conductivity are rationally used, reduce the equipment of pickling process acid consumption. The utility model discloses a hardware relies on lying in the redesign of pickling leveling machine group pickling section to, what the following statement was directed against is pickling leveling machine group pickling section, and other parts of unit are different according to the production line, and do not have the injecing.
In the embodiment shown in fig. 1, the pickling section is divided into 4 pickling tanks, and the pickling tanks are named as a first acid tank 1, a second acid tank 2, a third acid tank 3 and a fourth acid tank 4 according to the sequence of the strip steel entering the pickling tanks. In this embodiment unit, every pickling tank is 25m long, separates each other through a pair of crowded sour roller between the pickling tank, and every pickling tank corresponds a set of accumulator: a first circulation tank 5, a second circulation tank 6, a third circulation tank 7 and a fourth circulation tank 8 are used for ensuring the supply of acid liquor, and acid liquor circulation exists between the acid tanks with the same reference numbers. The circulation tanks are also used as acid liquor collecting tanks, each circulation tank is communicated with the other circulation tanks and is controlled by a valve and a liquid level, so that the acid liquor in the fourth circulation tank 8 flows towards the third circulation tank 7, the second circulation tank 6 and the first circulation tank 5 without a cascade. Each recycle tank is guaranteed to have a concentration from high to low, and therefore the first recycle tank 5 has the lowest acid concentration and is also the recycle tank for the waste acid. Once the strip is temporarily stopped, the acid liquor of the pickling tank can be discharged into the corresponding circulating tank.
The above recycle tank and acid tank form two pickling cycles: a large pickling cycle and a small pickling cycle.
Acid washing major cycle: the acid liquor in the circulating tank is heated by a graphite heater through a pump and a pipeline and pumped into the corresponding acid tank, and then returns to the circulating tank from the acid tank to form a large circulation of acid washing.
Acid washing and small circulation: the acid liquor in the circulating tank is heated by the graphite heater through the pump and the pipeline, and then does not pass through the acid tank, and directly returns to the circulating tank from another pipeline, so that the process is called as a small pickling circulating system.
The specific structure is shown in figure 1:
the acid outlet of the first circulating tank 5 is connected with the acid inlet of the first acid tank 1 through an acid outlet channel, and the acid outlet of the first acid tank 1 is connected with the acid inlet of the first circulating tank 5 through a pipeline with an acid discharging valve. The specific acid outlet channel is as follows: an acid outlet of the first circulating tank 5 enters the first acid tank 1 through a pipeline via an acid washing pump 9 and a graphite heater 10, and an acid supplementing valve is arranged between the graphite heater 10 and the first acid tank 1. An acid washing small circulation branch is arranged between the graphite heater 10 and the acid supplementing valve and is connected with an acid inlet of the first circulation tank 5 through the small circulation valve. According to specific working conditions, a plurality of pickling large circulation branches are additionally arranged between the pickling pump 9 and the graphite heater 10 of the acid outlet channel and connected with the acid inlet of the first acid tank 1, and the graphite heater 10 is arranged on the pickling large circulation branches.
An acid outlet of the second circulating tank 6 is connected with an acid inlet of the second acid tank 2 through an acid outlet channel, and an acid outlet of the second acid tank 2 is connected with an acid inlet of the second circulating tank 6 through a pipeline with an acid discharge valve. The specific acid outlet channel is as follows: an acid outlet of the second circulation tank 6 enters the second acid tank 2 through a pickling pump and a graphite heater through a pipeline, an acid supplementing valve is arranged between the graphite heater and the second acid tank 2, and a pickling small circulation branch is arranged between the graphite heater and the acid supplementing valve and is connected with an acid inlet of the second circulation tank 6 through a small circulation valve. According to specific working conditions, an acid washing large circulation branch is additionally arranged between the acid washing pump of the acid outlet channel and the graphite heater and is connected with the acid inlet of the second acid tank 2. In the optimization scheme, the graphite heaters in the acid outlet channel are connected in parallel in two ways.
The connection relationship between the third circulation tank 7 and the third acid tank 3 and between the fourth circulation tank 8 and the fourth acid tank 4 is the same as that between the second circulation tank 6 and the second acid tank 2, and will not be described again.
The fourth circulating tank 8, the third circulating tank 7, the second circulating tank 6 and the first circulating tank 5 are connected in series through a pipeline with an acid valve. The fourth circulation tank 8 is connected with an acid adding passage through an acid valve, and is also provided with a self-circulation passage, namely a self-circulation acid outlet is connected with the acid adding passage through an acid washing pump. The first circulation tank 5 is connected to an acid discharge path through an acid valve.
And a liquid level meter is arranged in each circulation tank. There is a conductivity meter between the first recycle tank 5 and the acid drain path acid valve. A conductivity meter is arranged between the fourth circulation tank 8 and the acid valve of the acid inlet path.
The data of the liquid level meter and the conductivity meter are in data connection with a central control system, and the acid discharge valve, the acid supplementing valve, the small circulation valve and the acid valve are controlled to be opened and closed remotely by the central control system. The hardware connection and software configuration of the central control system are set in the prior art, and the specific data processing mode is different according to different suppliers, which are well known in the art and will not be described again here.
The utility model discloses a hardware connection is as above, when specifically using, in the pickling macrocycle: and performing combined drainage and combined compensation according to the pickling requirement of the steel grade by taking the data of the liquid level meter and the conductivity meter as the basis. The acid discharging and supplementing process is realized by opening and closing acid valves of the acid adding passage and the acid discharging passage. In the optimization scheme, the linkage process is realized by an automatic control program, and the specific realization mode is that parameter setting can be automatically added into the existing automatic valve control program without manual intervention or introduction of new software. Wherein the conductivity of the acid liquor is measured on line by a conductivity instrument in the acid tank. The acid discharge valve can be automatically closed during small pickling circulation, and meanwhile, the small circulation valve is opened, and is generally used for roll changing and other operations.
It should be noted that while the invention has been described in detail with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various obvious changes can be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a low acid consumption low iron loss pickling group of combined row's allies oneself with benefit which characterized in that: comprises a first acid tank, a second acid tank, a third acid tank, a fourth acid tank, a first circulating tank, a second circulating tank, a third circulating tank and a fourth circulating tank; acid liquor circulation exists between the acid tanks and the circulation tanks with the same labels, the acid liquor circulation comprises a large pickling circulation and a small pickling circulation, and the large pickling circulation is that the acid liquor in the circulation tanks is heated by a graphite heater through a pump and a pipeline and then pumped into the corresponding acid tanks and then returns to the circulation tanks from the acid tanks; the small pickling circulation is that the acid liquor in the circulation tank is heated by a graphite heater through a pump and a pipeline, does not pass through an acid tank, and directly returns to the circulation tank from another pipeline; the fourth circulating tank, the third circulating tank, the second circulating tank and the first circulating tank are connected in series through a pipeline with an acid valve; the fourth circulating tank is connected with the acid adding passage through an acid valve, and the first circulating tank is connected with the acid discharging passage through an acid valve; a liquid level meter is arranged in each circulation tank; a conductivity meter is arranged between the first circulating tank and the acid valve of the acid discharging passage; and a conductivity meter is arranged between the fourth circulation tank and the acid valve of the acid inlet passage.
2. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing group as claimed in claim 1, characterized in that: the connection relationship between the third circulation tank and the third acid tank and the connection relationship between the fourth circulation tank and the fourth acid tank are the same as the connection relationship between the second circulation tank and the second acid tank.
3. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing group as claimed in claim 1, characterized in that: the acid liquor circulation between the first acid tank and the first circulation tank is as follows: the acid outlet of the first circulating tank is connected with the acid inlet of the first acid tank through an acid outlet channel, and the acid outlet of the first acid tank is connected with the acid inlet of the first circulating tank through a pipeline with an acid discharge valve; the acid outlet channel is as follows: an acid outlet of the first circulating tank enters a first acid tank through a pickling pump and a graphite heater through a pipeline, and an acid supplementing valve is arranged between the graphite heater and the first acid tank; an acid washing small circulation branch is arranged between the graphite heater and the acid supplementing valve and is connected with an acid inlet of the first circulation tank through the small circulation valve.
4. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing set according to claim 3, characterized in that: an acid washing large circulation branch is additionally arranged between the acid washing pump of the acid outlet channel and the graphite heater and connected with the acid inlet of the first acid tank, and the graphite heater is arranged on the acid washing large circulation branch.
5. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing group as claimed in claim 1, characterized in that: the acid liquor circulation between the second acid tank and the second circulation tank is as follows: the acid outlet of the second circulating tank is connected with the acid inlet of the second acid tank through an acid outlet channel, and the acid outlet of the second acid tank is connected with the acid inlet of the second circulating tank through a pipeline with an acid discharge valve; the acid outlet channel is as follows: the acid outlet of the second circulation tank enters a second acid tank through a pickling pump and a graphite heater through a pipeline, an acid supplementing valve is arranged between the graphite heater and the second acid tank, and a pickling small circulation branch is arranged between the graphite heater and the acid supplementing valve and is connected with the acid inlet of the second circulation tank through a small circulation valve.
6. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing set according to claim 5, characterized in that: an acid washing large circulation branch is additionally arranged between the acid washing pump of the acid outlet channel and the graphite heater and is connected with an acid inlet of the second acid tank.
7. The combined-row combined-compensation low-acid-consumption and low-iron-loss acid washing set according to claim 5, characterized in that: the graphite heaters in the acid outlet channel are connected in parallel in two ways.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922109875.6U CN211546675U (en) | 2019-11-30 | 2019-11-30 | Low-acid-consumption and low-iron-loss acid washing group for combined-row combined compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922109875.6U CN211546675U (en) | 2019-11-30 | 2019-11-30 | Low-acid-consumption and low-iron-loss acid washing group for combined-row combined compensation |
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| Publication Number | Publication Date |
|---|---|
| CN211546675U true CN211546675U (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922109875.6U Expired - Fee Related CN211546675U (en) | 2019-11-30 | 2019-11-30 | Low-acid-consumption and low-iron-loss acid washing group for combined-row combined compensation |
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| CN (1) | CN211546675U (en) |
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- 2019-11-30 CN CN201922109875.6U patent/CN211546675U/en not_active Expired - Fee Related
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Granted publication date: 20200922 Termination date: 20211130 |