CN112967767B - Shot blasting-pickling combined descaling process optimization method - Google Patents
Shot blasting-pickling combined descaling process optimization method Download PDFInfo
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Abstract
The invention provides a shot blasting and pickling combined descaling process optimization method, and belongs to the technical field of steel production. The method comprises the following steps: designing a plurality of shot blasting-pickling combined descaling schemes based on different strip steel running speeds; determining the amount of acid required for each of said shot blasting-pickling compound descaling schemes; constructing a cost function based on the running speed of the strip steel and the acid consumption, and respectively calculating the descaling cost corresponding to each shot blasting-pickling combined type descaling scheme through the cost function; and determining the strip steel running speed corresponding to the shot blasting and acid pickling combined type descaling scheme with the lowest descaling cost, and taking the strip steel running speed as the optimal strip steel running speed to realize strip steel descaling. The invention aims at minimizing the descaling cost, and selects the optimal strip steel running speed, so that the scale layer proportion removed by the shot blasting system and the pickling system is reasonably and efficiently distributed, and the energy efficiency of the system is effectively improved; meanwhile, the consumption of ton of acid liquid is reduced as much as possible, and the method has wide market application prospect.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to a shot blasting and pickling combined descaling process optimization method.
Background
In the steel production flow, the pickling line is a process section for removing a scale layer (a tertiary oxide layer) on the surface of the strip steel by using a chemical acid solution. The production of the pickling line consumes a large amount of acid solution, the three wastes are seriously discharged, and the acid environment corrodes peripheral mechanical equipment to harm the health of workers.
The composite scale removing technology of shot blasting and acid washing refers to a scale removing mode that a certain proportion of scale layers are removed by shot blasting impact and residual scale layers are removed by acid washing. The shot blasting-pickling combined type descaling device shown in fig. 2 comprises a front shot blasting descaling system and a rear pickling system, wherein the shot blasting descaling system comprises a descaling box 1 and a shot blasting machine 2 for removing a certain proportion of scale layers through shot blasting impact, and the rear pickling system comprises a pickling tank, and an acid solution 3 is arranged in the pickling tank and is used for removing residual scale layers.
The ball blasting-pickling combined descaling technology can greatly reduce the consumption of acid solution, reduce the descaling cost of ton steel and has wide application prospect.
However, the process control method of the conventional composite descaling technology is very immature, and particularly has the problems of composite distribution, namely a front shot blasting system and a rear pickling system, wherein the cost is optimal by respectively removing a scale layer, the core problem is not solved, as shown in fig. 3 and 4, black parts represent scale layers, white parts represent strip steel matrixes exposed after descaling, and the practical problems are as follows:
1. if the running speed of the strip steel in the front shot blasting and descaling system is too high, the shot blasting and descaling time is very short, as shown in fig. 3, the scale removal proportion of the front shot blasting and descaling is too small, the acid consumption of the subsequent pickling system is almost unchanged compared with that of the traditional pickling line, the acid reduction effect is not achieved, the pickling cost is high, and the three wastes are still seriously discharged, so that the descaling advantage of front shot blasting and descaling cannot be reflected.
2. If the running speed of the strip steel in the front shot blasting descaling system is too slow, the shot blasting descaling time is long, as shown in fig. 4, the front scale layer removal proportion is too large, the acid consumption of the subsequent pickling system is small compared with that of the traditional pickling line, the pickling cost and the three-waste emission are effectively reduced, but the front shot blasting system consumes too much electric energy, the whole system is still high in ton steel treatment cost, and the large-scale popularization in the market is difficult.
In addition, the factors such as strip steel materials, hot rolling process, cooling conditions, storage time and the like can influence the composition, thickness, bonding force with a substrate and the like of a scale layer, so that the shot blasting-pickling scale removal process is very complex. For example, the distribution system in a certain type of steel descaling process is found empirically on site, but this process system is highly likely to be completely unsuitable for another type of steel.
Disclosure of Invention
The invention aims to solve the technical problem of providing a blasting-pickling combined type descaling process optimization method, which aims to solve the problems that the process of the existing blasting-pickling combined type descaling technology is not mature, the scale layer proportion removed by a blasting system and a pickling system cannot be reasonably and efficiently distributed, and if the scale layer proportion removed by a front-stage blasting system is too small, the acid-reducing effect cannot be achieved compared with the traditional pickling, and the advantages of front-stage blasting and descaling cannot be reflected; if the scale layer proportion removed by the earlier shot blasting system is too large, too much electric energy is consumed, and the whole system has too high cost.
In order to solve the technical problems, the invention provides a blasting-pickling combined type descaling process optimization method, which comprises the following steps:
designing a plurality of shot blasting-pickling combined descaling schemes; wherein, the strip steel running speeds of the shot blasting and acid pickling compound descaling schemes are different from each other;
determining the amount of acid required for each of said shot blasting-pickling compound descaling schemes;
constructing a cost function based on the running speed of the strip steel and the acid consumption, and respectively calculating the descaling cost corresponding to each shot blasting-pickling combined type descaling scheme through the cost function;
and determining the strip steel running speed corresponding to the shot blasting and acid pickling combined type descaling scheme with the lowest descaling cost, and taking the strip steel running speed as the optimal strip steel running speed to realize strip steel descaling.
Further, the design of a plurality of shot blasting-pickling combined descaling schemes comprises:
measuring the reference running speed v of the strip steel c ；
According to the formula
ν i ＝i×K -1 ×ν c
Calculating the running speed of the strip steel corresponding to each shot blasting-pickling combined type descaling scheme to obtain each shot blasting-pickling combined type descaling scheme,
wherein,,
k represents the number of the shot blasting-pickling combined descaling schemes; k is a natural number, and K is more than or equal to 10 and less than or equal to 20;
ν i the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme is shown.
Further, the measuring of the reference running speed v of the strip steel c Comprising:
setting the initial running speed v of the strip steel 0 Performing shot blasting and descaling;
cutting the strip steel subjected to shot blasting and descaling, preparing an observation sample, and measuring the removal rate of the observation sample;
when the removal rate is less than 95%, v is reduced 0 Repeatedly performing shot blasting and descaling and preparing an observation sample until the removal rate of the observation sample is not less than 95% and less than 100%, v 0 The numerical value of (a) is the reference running speed v of the strip steel c 。
Further, said determining the amount of acid required for each of said shot blasting-pickling compound scale removal schemes comprises:
respectively running each shot blasting-pickling combined type descaling scheme, and cutting and edging the shot blasting-pickling combined type descaling strip steel corresponding to each shot blasting-pickling combined type descaling scheme according to a preset size to obtain a plurality of samples respectively corresponding to each shot blasting-pickling combined type descaling scheme;
the obtained plurality of samples were subjected to an acid washing test one by one to obtain the acid consumption of each sample.
Further, the step of subjecting the obtained plurality of samples to an acid washing experiment one by one to obtain the acid consumption of each sample comprises the steps of:
taking a plurality of pickling tanks corresponding to the number of the samples;
taking acid solution, measuring the mass percentage content of the original acid solution, and respectively pouring the acid solution with the same mass into the plurality of pickling tanks;
immersing the samples in the corresponding pickling tanks in sequence, carrying out pickling treatment, and taking out the samples after the scale layer on the surfaces of the samples is pickled, namely when the removal rate is 100%;
measuring the mass percentage of the acid solution in each pickling tank after the pickling experiment is finished;
according to the formula:
M i ＝(ω 0 -ω i )×M
the acid consumption of each sample was calculated,
wherein,,
ω 0 the mass percentage of the original acid solution is as follows;
ω i the acid solution mass percentage content in the ith pickling tank after the pickling experiment is finished;
m is the mass of the acid solution poured into each pickling tank;
M i the acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
Further, the cost function is expressed as:
wherein,,
alpha is the energy consumption coefficient of the shot blasting system, and means the electric energy cost consumed in unit time when the shot blasting descaling system works;
beta is an acid washing cost coefficient, which means the acid liquid cost consumed by acid washing per unit area of the surface;
s is the length of the processed steel coil;
d is the width of the processed steel coil;
a is the length of the pickling sample;
b is the width of the pickling sample;
ν i the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme；
M i The acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the optimization method of the shot blasting-pickling combined type descaling process can aim at minimizing the descaling cost and select the optimal running speed of the strip steel, so that the scale layer proportion removed by a shot blasting system and a pickling system is reasonably and efficiently distributed, and the energy efficiency of the system is effectively improved; meanwhile, the consumption of ton of acid liquid is reduced as much as possible, and the method has wide market application prospect.
Drawings
FIG. 1 is a flow chart of a method for optimizing a blasting-pickling combined descaling process according to the present invention;
FIG. 2 is a schematic view of a shot blasting-pickling combined descaling device used in the present invention;
FIG. 3 is a schematic diagram of the descaling process when the strip steel is running at a higher speed in the shot blasting descaling process;
FIG. 4 is a schematic diagram of the descaling process when the strip steel is running at a slower speed during the shot blasting descaling process.
[ reference numerals ]
1. A descaling box;
2. a shot blasting device;
3. an acid solution.
Detailed Description
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides a method for optimizing a blasting-pickling combined type descaling process, which includes:
s101, designing a plurality of shot blasting-pickling combined descaling schemes; wherein, the strip steel running speeds of the shot blasting and acid pickling compound descaling schemes are different from each other;
in this embodiment, S101 specifically includes:
1. measuring the reference running speed v of the strip steel c ；
2. According to the formula
ν i ＝i×K -1 ×ν c
Calculating the running speed of the strip steel corresponding to each shot-blasting and pickling combined type descaling scheme to obtain each shot-blasting and pickling combined type descaling scheme,
wherein,,
k represents the number of the shot blasting-pickling combined descaling schemes; k is a natural number, and satisfies the following conditions: k is more than or equal to 10 and less than or equal to 20;
ν i representing the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme;
i represents scheme labels, i is a natural number, and the scheme labels satisfy the following conditions: i is more than or equal to 1 and less than or equal to K.
Then marking each scheme according to the sequence from the small to the large of the strip steel running speed, and marking the schemes as a scheme A in turn 1 Scheme A 2 … … scheme A i … … scheme A k ；
3. The calculated strip steel running speed v of each shot blasting-pickling combined type descaling scheme 1 、ν 2 、ν 3 ……ν k Is recorded.
Wherein, the measuring of the reference running speed v of the strip steel c The method specifically comprises the following steps:
the flow of the shot blasting and descaling shot material is regulated to the maximum, and the initial running speed v of the strip steel is set according to the field operation experience 0 Performing shot blasting and descaling; cutting the strip steel subjected to shot blasting and descaling, preparing an observation sample, and measuring the removal rate of the observation sample; when the removal rate is less than 95%, v is reduced 0 Repeatedly performing shot blasting and descaling and preparing an observation sample until the removal rate of the observation sample is not less than 95% and less than 100%, v 0 The numerical value of (a) is the reference running speed v of the strip steel c 。
S102, determining the acid consumption required by each shot blasting-pickling combined type descaling scheme;
in this embodiment, the step S102 specifically includes the following steps:
1. the flow of the shot blasting and descaling shot material is regulated to the maximum, and the calculated running speed v of the strip steel is used for controlling the flow of the shot blasting and descaling shot material to the maximum 1 Setting the actual running speed of the strip steel, respectively running each shot-blasting and pickling compound type descaling scheme to perform strip steel descaling operation, cutting and edging the shot-blasting and descaling strip steel corresponding to each shot-blasting and pickling compound type descaling scheme according to a preset size to obtain a plurality of samples respectively corresponding to each shot-blasting and pickling compound type descaling scheme, and respectively marking the samples as samples B 1 To sample B k ；
The trimming treatment is carried out on the cutting surface, so that the acid liquor only reacts with the surface of the strip steel containing the scale during subsequent pickling, but cannot react with the iron matrix exposed out of the cutting surface.
2. Carrying out acid washing experiments on the obtained multiple samples one by one to obtain the acid consumption of each sample, wherein the specific steps are as follows:
taking a plurality of small pickling tanks corresponding to the number of the samples, and sequentially marking the pickling tanks C 1 Pickling tank C 2 Pickling tank C 3 … … pickling tank C k The method comprises the steps of carrying out a first treatment on the surface of the Taking a certain amount of acid solution, measuring the mass percentage content of the original acid solution, and respectively pouring the acid solution with the same mass into the plurality of small pickling tanks; immersing the sample in the corresponding small pickling tanks in sequence, carrying out pickling treatment, and taking out the sample after the scale layer on the surface of the sample is pickled, namely when the removal rate is 100%; measuring the mass percentage of acid solution in each small pickling tank after the pickling experiment is finished; according to the formula:
M i ＝(ω 0 -ω i )×M
the acid consumption of each sample was calculated,
wherein,,
ω 0 the mass percentage of the original acid solution is as follows;
ω i the acid solution mass percentage content in the ith pickling tank after the pickling experiment is finished;
m is the mass of the acid solution poured into each pickling tank;
M i the acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
S103, constructing a cost function based on the running speed of the strip steel and the acid consumption, and respectively calculating the descaling cost corresponding to each shot blasting-pickling combined type descaling scheme through the cost function;
wherein the expression of the cost function is:
wherein,,
alpha is the energy consumption coefficient of the shot blasting system;
beta is the pickling cost coefficient;
s is the length of the processed steel coil;
d is the width of the processed steel coil;
a is the length of the pickling sample;
b is the width of the pickling sample;
ν i the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme is set;
M i the acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
S104, determining the running speed of the strip steel corresponding to the shot blasting-pickling combined type descaling scheme with the lowest descaling cost, and taking the running speed as the optimal running speed of the strip steel so as to realize the descaling work of the strip steel.
After the optimal strip steel running speed is determined, the scale removal distribution of the front shot blasting system and the rear pickling system is determined, and the cost is optimal. After descaling by a shot blasting system, the surface descaling rate of the strip steel is a fixed value, and in a subsequent pickling system, the value of the consumed acid liquor of a scale layer remained on a unit area is also a fixed value; the industrial site can adjust the main parameters of the pickling according to the detection of the surface quality of the strip steel at the pickling outlet end to form a control closed loop. At present, the traditional pickling line surface quality detection and parameter control technology is very mature, which brings convenience to the field application of the blasting-pickling combined type descaling process optimization method.
In the scheme, the shot blasting-pickling combined type descaling process optimization method can aim at minimizing the descaling cost, and selects the optimal strip steel running speed, so that the scale layer proportion removed by a shot blasting system and a pickling system is reasonably and efficiently distributed, the energy efficiency of the system is effectively improved, and meanwhile, the ton of acid liquor is reduced as much as possible.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The optimization method of the shot blasting-pickling combined descaling process is characterized by comprising the following steps of:
designing a plurality of shot blasting-pickling combined descaling schemes; wherein, the strip steel running speeds of the shot blasting and acid pickling compound descaling schemes are different from each other;
determining the amount of acid required for each of said shot blasting-pickling compound descaling schemes;
constructing a cost function based on the running speed of the strip steel and the acid consumption, and respectively calculating the descaling cost corresponding to each shot blasting-pickling combined type descaling scheme through the cost function;
determining the running speed of the strip steel corresponding to the shot blasting and pickling combined type descaling scheme with the lowest descaling cost, and taking the running speed as the optimal running speed of the strip steel so as to realize the descaling work of the strip steel;
the expression of the cost function is:
wherein,,
alpha is the energy consumption coefficient of the shot blasting system;
beta is the pickling cost coefficient;
s is the length of the processed steel coil;
d is the width of the processed steel coil;
a is the length of the pickling sample;
b is the width of the pickling sample;
ν i the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme is set;
M i the acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
2. The method of claim 1, wherein the designing a plurality of shot-blast-pickling combined descaling schemes comprises:
measuring the reference running speed v of the strip steel c ；
According to the formula
ν i ＝i×K -1 ×ν c
Calculating the running speed of the strip steel corresponding to each shot blasting-pickling combined type descaling scheme to obtain each shot blasting-pickling combined type descaling scheme,
wherein,,
k represents the number of the shot blasting-pickling combined descaling schemes; k is a natural number, and K is more than or equal to 10 and less than or equal to 20;
ν i representing the running speed of the strip steel corresponding to the ith shot blasting-pickling combined type descaling scheme;
i represents scheme label, i is natural number, i is more than or equal to 1 and less than or equal to K.
3. The optimization method of a shot blasting-pickling combined descaling process according to claim 2, wherein the determination of the reference running speed v of the strip steel is characterized in that c Comprising:
setting the initial running speed v of the strip steel 0 Performing shot blasting and descaling;
cutting the strip steel subjected to shot blasting and descaling, preparing an observation sample, and measuring the removal rate of the observation sample;
when the removal rate is less than 95%, v is reduced 0 Repeatedly performing shot blasting and descaling and preparing an observation sample until the removal rate of the observation sample is not less than 95% and less than 100%, v 0 The numerical value of (a) is the reference running speed v of the strip steel c 。
4. The method of claim 1, wherein said determining the amount of acid required for each of said shot-blast-pickle composite descaling schemes comprises:
respectively running each shot blasting-pickling combined type descaling scheme, and cutting and edging the shot blasting-pickling combined type descaling strip steel corresponding to each shot blasting-pickling combined type descaling scheme according to a preset size to obtain K samples respectively corresponding to each shot blasting-pickling combined type descaling scheme;
the obtained K samples were subjected to an acid washing experiment one by one to obtain the acid consumption of each sample.
5. The optimization method of a shot blasting-pickling combined descaling process according to claim 4, wherein the step of performing a pickling experiment on the K obtained samples one by one to obtain the acid consumption of each sample comprises the steps of:
taking K pickling tanks corresponding to the number of the samples;
taking acid solutions of an on-site pickling line, determining the mass percentage content of original acid solutions, and respectively pouring the acid solutions with the same mass into the K pickling tanks;
immersing each sample in a corresponding pickling tank in sequence, carrying out pickling treatment, and taking out the sample after the scale layer on the surface of the sample is pickled, namely when the removal rate is 100%;
measuring the mass percentage of the acid solution in each pickling tank after the pickling experiment is finished;
according to the formula:
M i ＝(ω 0 -ω i )×M
the acid consumption of each sample was calculated,
wherein,,
ω 0 the mass percentage of the original acid solution is as follows;
ω i the acid solution mass percentage content in the ith pickling tank after the pickling experiment is finished;
m is the mass of the acid solution poured into each pickling tank;
M i the acid consumption of the sample corresponding to the ith shot blasting-acid washing combined type descaling scheme is obtained.
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| JP2004331994A (en) * | 2003-04-30 | 2004-11-25 | Nippon Steel Corp | Descaling pickling method for hot rolled steel sheet of high carbon steel |
| JP2008229681A (en) * | 2007-03-22 | 2008-10-02 | Jfe Steel Kk | Method of deciding line speed in continuous pickling line of steel strip |
| CN111604786A (en) * | 2020-04-22 | 2020-09-01 | 山西太钢不锈钢股份有限公司 | Acid pickling process for stainless steel hot-rolled strip steel |
| CN111944953A (en) * | 2020-09-04 | 2020-11-17 | 马鞍山钢铁股份有限公司 | Method for reducing number of small-size nonmetallic inclusions in steel |
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| US20090148335A1 (en) * | 2007-02-28 | 2009-06-11 | Adair Richard E | Process for surface treatment of metals |
| US20150066184A1 (en) * | 2013-06-27 | 2015-03-05 | Jemison-Demsey, LLC | Process for optimization |
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|---|---|---|---|---|
| JP2004331994A (en) * | 2003-04-30 | 2004-11-25 | Nippon Steel Corp | Descaling pickling method for hot rolled steel sheet of high carbon steel |
| JP2008229681A (en) * | 2007-03-22 | 2008-10-02 | Jfe Steel Kk | Method of deciding line speed in continuous pickling line of steel strip |
| CN111604786A (en) * | 2020-04-22 | 2020-09-01 | 山西太钢不锈钢股份有限公司 | Acid pickling process for stainless steel hot-rolled strip steel |
| CN111944953A (en) * | 2020-09-04 | 2020-11-17 | 马鞍山钢铁股份有限公司 | Method for reducing number of small-size nonmetallic inclusions in steel |
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| 冷轧不锈钢原料的钢砂除鳞;穆景权;;山西冶金(第01期);32-34 * |
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