阅读说明：本技术 一种兼顾多系列产品的冷轧乳化液过滤系统及过滤方法 (Cold-rolled emulsion filtering system and method considering multiple series of products ) 是由 陈全忠 吴有生 于 2020-12-21 设计创作，主要内容包括：本发明公开了一种兼顾多系列产品的冷轧乳化液过滤系统,包括磁棒式磁过滤回路和电磁过滤回路；所述磁棒式磁过滤回路包括乳化液收集盘、污乳化液箱、磁棒式磁过滤器、净乳化液箱和反冲洗过滤器；所述乳化液收集盘设于轧机的喷射梁下方,乳化液收集盘、污乳化液箱、磁棒式磁过滤器、净乳化液箱和反冲洗过滤器依次通过管道连通,所述反冲洗过滤器的出口通过管道与轧机的喷射梁连通；所述电磁过滤回路包括过电磁过滤器,电磁过滤器的入口和出口分别通过管道与净乳化液箱连通。本发明的有益效果为：本发明可针对不同系列的冷轧不锈钢产品特点,启用不同的乳化液过滤回路,以达到良好的过滤效果及过滤效率,具有很好的通用性及适应性。(The invention discloses a cold-rolled emulsion filtering system considering multiple series of products, which comprises a magnetic rod type magnetic filtering loop and an electromagnetic filtering loop, wherein the magnetic rod type magnetic filtering loop is connected with the electromagnetic filtering loop through a pipeline; the magnetic rod type magnetic filtering loop comprises an emulsion collecting disc, a dirty emulsion box, a magnetic rod type magnetic filter, a clean emulsion box and a backwashing filter; the emulsion collecting tray is arranged below an injection beam of the rolling mill, the emulsion collecting tray, the dirty emulsion box, the magnetic rod type magnetic filter, the clean emulsion box and the backwashing filter are sequentially communicated through pipelines, and an outlet of the backwashing filter is communicated with the injection beam of the rolling mill through a pipeline; the electromagnetic filtering loop comprises an electromagnetic filter, and an inlet and an outlet of the electromagnetic filter are respectively communicated with the purified emulsion tank through pipelines. The invention has the beneficial effects that: the invention can use different emulsion filtering loops according to the characteristics of different series of cold-rolled stainless steel products so as to achieve good filtering effect and filtering efficiency, and has good universality and adaptability.)

1. A cold rolling emulsion filtration system considering multiple series of products is characterized by comprising a magnetic rod type magnetic filtration loop and an electromagnetic filtration loop; the magnetic rod type magnetic filtering loop comprises an emulsion collecting disc, a dirty emulsion box, a magnetic rod type magnetic filter, a clean emulsion box and a backwashing filter; the emulsion collecting tray is arranged below an injection beam of the rolling mill, the emulsion collecting tray, the dirty emulsion box, the magnetic rod type magnetic filter, the clean emulsion box and the backwashing filter are sequentially communicated through pipelines, and an outlet of the backwashing filter is communicated with the injection beam of the rolling mill through a pipeline; the electromagnetic filtering loop comprises an electromagnetic filter, an inlet and an outlet of the electromagnetic filter are respectively communicated with the purified emulsion tank through pipelines, and a filtering pump and a filtering valve are sequentially arranged on a communication pipeline between the inlet of the electromagnetic filter and the purified emulsion tank along the flowing direction of fluid.

2. The filtration system of claim 1, wherein a flat bed filter is added to the conduit between the magnetic rod type magnetic filter and the net emulsified fuel tank.

3. The filtration system of claim 1, wherein a skimmer is disposed in the dirty emulsion tank.

4. A filter system according to claim 1, wherein an agitator is provided in the net emulsion tank.

5. The filtration system of claim 1, further comprising a clean oil supply line having disposed thereon, in order along the direction of fluid flow, a clean oil tank, a clean oil supply pump, a clean oil flow valve, and a clean oil flow meter.

6. The filtration system of claim 1, further comprising a desalted water supply line, on which a desalted water tank, a desalted water supply pump, a desalted water flow valve, and a desalted water flow meter are sequentially disposed in a fluid flow direction.

7. A filtering method based on the filtering system of any one of claims 1 to 6, characterized in that the method comprises the following steps: when the 400 series stainless steel is rolled, the electromagnetic filtering loop is switched to a closed state, a filtering pump and a filtering valve of the electromagnetic filtering loop are both closed, and only the magnetic rod type magnetic filtering loop is started to filter the emulsion; when 200 series or 300 series stainless steel is rolled, the electromagnetic filtering loop is switched to an open state, a filtering pump and a filtering valve of the electromagnetic filtering loop are both opened, and the magnetic rod type magnetic filtering loop and the electromagnetic filtering loop are started to filter the emulsion.

Technical Field

The invention relates to the technical field of cold-rolled stainless steel, in particular to a cold-rolled emulsion filtering system and a filtering method considering multiple series of products.

Background

In recent years, the production of cold-rolled stainless steel is developed towards scale, intensification and high-efficiency saving, and a plurality of stainless steel products (such as 2D and 2B surface grade products) which are traditionally produced by pure rolling oil rolling are gradually changed into emulsion rolling production. The emulsion rolling has the advantages of better cooling and safety, lower medium consumption and production cost, and the disadvantage that the surface quality of the strip steel is not as good as that of a pure oil rolling product because iron powder in the stainless steel cold rolling dirty emulsion is not effectively removed. The iron powder in the dirty emulsion is mainly from the falling of an iron matrix caused by the friction between the strip steel and the surface of the working roll during cold rolling. When emulsion rich in iron powder is sprayed into a roll gap, a large amount of iron powder is pressed into the surface of stainless steel strip steel under the action of strong rolling pressure, so that the surface of the strip steel is blackened, and the surface reflectivity is reduced; the adsorption effect of the pressed iron powder on the rolling oil increases the residual oil on the surface of the finished product strip steel.

At present, cold-rolled stainless steel products mainly comprise 200 series stainless steel, 300 series stainless steel and 400 series stainless steel, wherein the base structures of the 200 series stainless steel and the 300 series stainless steel are austenite, the magnetism is very weak, and most iron powder is also weak magnetism, so that most iron powder in the cold-rolled 200 series stainless steel and 300 series stainless steel dirty emulsion cannot be effectively removed by a conventional emulsion filtering scheme which is configured by combining a magnetic rod type magnetic filter and a flat bed filter, and the surface quality of the products is poor. Namely, the existing stainless steel cold rolling emulsion filtering system is only suitable for producing 400 series stainless steel products, but not suitable for producing 200 series and 300 series stainless steel products.

In addition, there is also the research of relevant filter equipment, but current relevant filter equipment all is only applicable to the separation large granule impurity, and the separation effect is not good. Like patent 201510490294.5 discloses a rolling oil filter equipment of hierarchical formula that deposits, its technical characterstic is, through the dirty oil suction in the oil-well pump will cartridge filter case setting 3 settling tanks in series altogether, makes the dirty oil carry out tertiary sediment. The oil precipitated by the previous precipitation tank enters the next precipitation tank from top to bottom for continuous precipitation, and the purified rolling oil is finally sent into a dirty oil tank. Practice has shown that only large particulate impurities (typically greater than 10 μm in size) can precipitate from rolling oil, while small particulate impurities (e.g., less than 10 μm in size) precipitate slowly or even without precipitation due to adsorption by the rolling oil. Therefore, this method is only suitable for separating large-particle impurities from rolling oil. Because the size of more than 90% of the iron powder particles in the cold rolling emulsion or the rolling oil is 1-10 mu m, the method has low iron powder removal rate.

Patent 2010068454 (Method for circulating and circulating rolling oil for cold rolling, and apparatus for cold rolling) discloses a Method for circulating and supplying cold-rolled emulsion, which is technically characterized in that an oil separator and a centrifugal separator are arranged in a bypass way in a conventional emulsion filtering system to further filter impurities such as iron powder in the emulsion. Dirty emulsion first enters the high filtering precision oil separator, because a large amount of oil particles and iron powder are blocked from passing through, dirty emulsion is separated into low density emulsion and rolling oil containing iron powder. The low-density emulsion returns to the emulsion box to participate in circulation again, the rolling oil containing the iron powder enters a centrifugal separation device to further separate the iron powder and the rolling oil, the iron powder is discharged outside, and the rolling oil returns to the emulsion box to participate in circulation again. The disadvantages of this method are: the mode through filtering blocks that oil grain and iron powder pass through, leads to oil separator efficiency very low certainly, and centrifugal separation device is also proved by practice only to be applicable to impurity such as separation large granule iron powder moreover, still adsorbs in the rolling oil after the separation to have impurity such as a large amount of small granule iron powder, therefore the separation effect is not good.

In view of the above, there is still a need to develop a cold continuous emulsion filtration system and a filtration method with better versatility and suitable for different series of stainless steel products.

Disclosure of Invention

The invention aims to provide a cold-rolled emulsion filtering system and a cold-rolled emulsion filtering method which have good filtering effect and take multiple series of products into consideration aiming at the defects of the prior art.

The technical scheme adopted by the invention is as follows: a cold rolling emulsion filtration system considering multiple series of products comprises a magnetic rod type magnetic filtration loop and an electromagnetic filtration loop; the magnetic rod type magnetic filtering loop comprises an emulsion collecting disc, a dirty emulsion box, a magnetic rod type magnetic filter, a clean emulsion box and a backwashing filter; the emulsion collecting tray is arranged below an injection beam of the rolling mill, the emulsion collecting tray, the dirty emulsion box, the magnetic rod type magnetic filter, the clean emulsion box and the backwashing filter are sequentially communicated through pipelines, and an outlet of the backwashing filter is communicated with the injection beam of the rolling mill through a pipeline; the electromagnetic filtering loop comprises an electromagnetic filter, an inlet and an outlet of the electromagnetic filter are respectively communicated with the purified emulsion tank through pipelines, and a filtering pump and a filtering valve are sequentially arranged on a communication pipeline between the inlet of the electromagnetic filter and the purified emulsion tank along the flowing direction of fluid.

According to the scheme, a flat bed filter is additionally arranged on the pipeline between the magnetic rod type magnetic filter and the purified emulsion oil tank.

According to the scheme, the dirty emulsion tank is provided with the oil skimmer.

According to the scheme, a stirrer is arranged in the purified emulsion tank.

According to the scheme, the filtering system further comprises a pure oil supply pipeline, and a pure oil tank, a pure oil supply pump, a pure oil flow valve and a pure oil flow meter are sequentially arranged on the pure oil supply pipeline along the fluid flow direction.

According to the scheme, the filtering system further comprises a desalted water supply pipeline, and the desalted water supply pipeline is sequentially provided with a desalted water tank, a desalted water supply pump, a desalted water flow valve and a desalted water flow meter along the fluid flow direction.

The invention also provides a filtering method based on the filtering system, which comprises the following steps: when the 400 series stainless steel is rolled, the electromagnetic filtering loop is switched to a closed state, a filtering pump and a filtering valve of the electromagnetic filtering loop are both closed, and only the magnetic rod type magnetic filtering loop is started to filter the emulsion; when 200 series or 300 series stainless steel is rolled, the electromagnetic filtering loop is switched to an open state, a filtering pump and a filtering valve of the electromagnetic filtering loop are both opened, and the magnetic rod type magnetic filtering loop and the electromagnetic filtering loop are started to filter the emulsion.

The invention has the beneficial effects that: the invention sets independent magnetic rod type magnetic filtering loop and electromagnetic filtering loop in the same emulsion filtering system, wherein the magnetic rod type magnetic filtering loop has simpler operation and maintenance, less water consumption, energy consumption and wastewater discharge, better filtering effect on iron powder in the strong magnetic 400 series stainless steel cold rolling emulsion, but poorer filtering effect on iron powder in the weak magnetic 200 series and 300 series stainless steel cold rolling emulsions, more emulsion oil consumption can be generated in the filtering process, and the electromagnetic filtering loop has higher use cost, but better filtering effect on weak magnetic iron powder. The invention complements the advantages and the disadvantages of the two filtering loops, gives full play to the advantages of the two filtering loops, avoids the disadvantages, and can use different emulsion filtering loops according to different series (200 series, 300 series and 400 series) of cold-rolled stainless steel products to achieve good filtering effect and filtering efficiency and reduce the total production cost. The cold-rolled emulsion filtering system disclosed by the invention is simple in structure, can be used for not only a newly-built cold-rolled stainless steel unit, but also can be very conveniently used for transforming the conventional cold-rolled stainless steel emulsion filtering system, can be used for enlarging the range of product varieties of the unit, and has good universality and adaptability.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Wherein: 1. an emulsion collection tray; 2. a dirty emulsion tank; 3. a magnetic rod type magnetic filter; 4. a flat bed filter; 5. a clean emulsion tank; 6. backwashing the filter; 7. a filter pump; 8. a filter valve; 9. an electromagnetic filter; 10. a rolling mill; 11. a spray beam; 12. an emulsion lift pump; 13. an emulsion supply pump; 14. an oil skimmer; 15. a stirrer; 16. a pure oil tank; 17. a pure oil supply pump; 18. a pure oil flow valve; 19. a pure oil flowmeter; 20. a desalted water tank; 21. a desalted water supply pump; 22. a desalinated water flow valve; 23. a desalted water flow meter.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The cold-rolled emulsion filtering system compatible with multiple series of products as shown in the figure 1 comprises a magnetic rod type magnetic filtering loop and an electromagnetic filtering loop; the magnetic rod type magnetic filtering loop comprises an emulsion collecting disc 1, a dirty emulsion box 2, a magnetic rod type magnetic filter 3, a clean emulsion box 5 and a backwashing filter 6; the emulsion collecting tray 1 is arranged below an injection beam 11 of the rolling mill 10, the emulsion collecting tray 1, the dirty emulsion tank 2, the magnetic rod type magnetic filter 3, the clean emulsion tank 5 and the backwashing filter 6 are sequentially communicated through pipelines, and an outlet of the backwashing filter 6 is communicated with the injection beam 11 of the rolling mill 10 through a pipeline; the electromagnetic filtering loop comprises an electromagnetic filter 9, an inlet and an outlet of the electromagnetic filter 9 are respectively communicated with the purified emulsion tank 5 through pipelines, and a filtering pump 7 and a filtering valve 8 are sequentially arranged on the communication pipeline between the inlet of the electromagnetic filter 9 and the purified emulsion tank 5 along the fluid flow direction.

Preferably, a flat bed filter 4 is additionally arranged on a pipeline between the magnetic rod type magnetic filter 3 and the clean emulsified oil tank.

Preferably, an oil skimmer 14 is arranged in the dirty emulsion tank 2 and is used for skimming floating oil residues on the surface of the dirty emulsion to prevent the floating oil residues from entering a subsequent filtering system to reduce the filtering efficiency; the agitator 15 is arranged in the emulsion purifying tank 5, so that the emulsion in the emulsion purifying tank 5 is uniformly mixed with oil and water, and oil-water separation is prevented.

In this embodiment, the above devices are specifically connected as follows: the emulsion collecting tray 1 is arranged at the bottom of the rolling mill 10 and is communicated with a dirty emulsion tank 2 arranged in an underground oil reservoir, the dirty emulsion tank 2 is communicated with an inlet of a magnetic rod type magnetic filter 3 through a pipeline (an emulsion lifting pump 12 is arranged on a communicating pipeline of the dirty emulsion tank and the magnetic rod type magnetic filter), an outlet of the magnetic rod type magnetic filter 3 is communicated with an inlet of a flat bed filter 4, an outlet of the flat bed filter 4 is communicated with a clean emulsion tank 5, the clean emulsion tank 5 is further communicated with an inlet of a backwashing filter 6 (an emulsion supply pump 13 is arranged on a communicating pipeline of the clean emulsion tank and the backwashing filter 6), and an outlet of the backwashing filter 6 is communicated with an injection beam 11 of the rolling mill 10.

Preferably, the filtering system further comprises a pure oil supply line, and a pure oil tank 16, a pure oil supply pump 17, a pure oil flow valve 18 and a pure oil flow meter 19 are sequentially arranged on the pure oil supply line along the fluid flow direction.

Preferably, the filtration system further includes a desalted water supply line on which a desalted water tank 20, a desalted water supply pump 21, a desalted water flow valve 22, and a desalted water flow meter 23 are sequentially arranged in a fluid flow direction.

A filtering method based on the filtering system comprises the following steps: when the 400 series stainless steel is rolled, the electromagnetic filtering loop is switched to a closed state, the filtering pump 7 and the filtering valve 8 of the electromagnetic filtering loop are both closed, and only the magnetic rod type magnetic filtering loop is started to filter the emulsion; when 200 series or 300 series stainless steel is rolled, the electromagnetic filtering loop is switched to an opening state, the filtering pump 7 and the filtering valve 8 of the electromagnetic filtering loop are both opened, and at the moment, the magnetic rod type magnetic filtering loop and the electromagnetic filtering loop are simultaneously started to filter the emulsion.

When the 400 series stainless steel is rolled, only the magnetic rod type magnetic filtration circuit is put into use, and the electromagnetic filtration circuit is not put into use, and the filtration pump 7 and the filtration valve 8 of the electromagnetic filtration circuit are both closed. Because the 400 series stainless steel is ferrite stainless steel and has stronger magnetism, and the iron powder is also strong magnetism, good filtering effect and filtering efficiency can be achieved only by opening the magnetic rod type magnetic filtering loop, and the electromagnetic filtering loop is not required to be opened, so that the production cost can be reduced.

When 200 series or 300 series stainless steel is rolled, the magnetic rod type magnetic filtration loop and the electromagnetic filtration loop are put into use, and the filtration pump 7 and the filtration valve 8 of the electromagnetic filtration loop are both opened. Because 200 series stainless steel and 300 series stainless steel are austenitic stainless steel and have weaker magnetism, the emulsified liquid contains partial weak magnetic iron powder, a magnetic rod type magnetic filtering loop and an electromagnetic filtering loop are required to be opened simultaneously, firstly, the magnetic rod type magnetic filtering loop is used for carrying out coarse filtering on the emulsified liquid, iron powder with stronger magnetism in the emulsified liquid is filtered, then, the electromagnetic filtering loop is used for carrying out fine filtering on the purified emulsified liquid, and weak magnetic iron powder in the emulsified liquid is filtered, so that good filtering effect and filtering efficiency can be obtained, and the production cost can be minimized.

The working principle of the embodiment is as follows:

(1) magnetic rod type magnetic filtration: dirty emulsion from a rolling mill 10 firstly enters an emulsion collecting tray 11, then overflows into a dirty emulsion tank 2 in an underground oil depot, is skimmed by an oil skimmer 14 to remove floating oil residues, is pumped to a magnetic rod type magnetic filter 3 by an emulsion lifting pump 12, removes magnetic iron powder in the dirty emulsion under the magnetic adsorption action of a magnetic rod (the magnetic field intensity is 5000Gs at most), then overflows into a flat bed filter 4, and further filters impurities such as floccules, large-particle iron powder, oxides and the like in the dirty emulsion; the filtered emulsion overflows to a clean emulsion tank 5 and is finally pumped to a spray beam 11 of a rolling mill 10 by an emulsion feed pump 13 and a back-flush filter 6. The backflushing filter 6 is used to remove large size particles from the emulsion and prevent clogging of the nozzles on the emulsion spray beam 11.

(2) Electromagnetic filtration: the emulsion in the purified emulsion tank 5 is pumped to an electromagnetic filter 9 through a filter pump 7 and a filter valve 8, weak magnetic iron powder is further removed under the action of the high magnetic field strength (up to 20000 Gs) of the electromagnetic filter 9, and the filtered emulsion overflows to the purified emulsion tank 5 again.

(3) Supplying fresh emulsion: fresh rolling oil and desalted water are intermittently supplied to the net emulsion tank 5 from the pure oil supply circuit and the desalted water supply circuit to replenish the emulsion consumed during the rolling process, so that the total emulsion flow in the filtration system is kept stable. The rolling oil in the pure oil tank 16 is pumped to the pure emulsion tank 5 through the pure oil supply pump 17, the pure oil flow valve 18 and the pure oil flow meter 19, the desalted water in the desalted water tank 20 is pumped to the pure emulsion tank 5 through the desalted water supply pump 21, the desalted water flow valve 22 and the desalted water flow meter 23, and during the pumping process, the flow ratio of the rolling oil and the desalted water is fed back and regulated and controlled through the pure oil flow valve 18, the pure oil flow meter 19, the desalted water flow valve 22 and the desalted water flow meter 23 respectively, so that the emulsion concentration in the filtering system is guaranteed to be stable.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.