Reversible cold rolling mill emulsion system transformation and optimization

Reversible cold rolling mill 2020 - emulsion system transformation and optimization 02 - 23 horse static abstract: based on 1500 mm reversible cold rolling mill in lai steel emulsion system, through the way for milk, recycling equipment, heating mode and magnetic filter equipment was improved, effectively solve the thin edge heat abrasion, low life of emulsion, and poor filtration precision, improve the quality of strip steel panel and adapted to the needs of the product structure adjustment. For cold rolling mill, the emulsion on the product surface quality of the rolling process, the thickness of the strip shape control, control, and has a very important role, such as roll life along with the high speed cold rolling and the development trend of large pressure ratio, also more and more high to the requirement of emulsion. Based on the 1500 mm single stand reversible cold rolling mill in lai steel production practice, analyzing problems arising from the use of emulsion and research, by means of emulsion systems continue to improve, effectively solve the emulsion is used up big, low life, product surface quality is poor, index difficult control problems. 1 emulsion system. 1 role emulsion emulsion mainly by 1% ~ 3% of the rolling oil and 97% ~ 99% of desalting water by mixing proportion of emulsion, in the process of rolling, in a certain temperature and pressure conditions, the dispersion in the rolling oil emulsion to physical adsorption and chemical adsorption in two ways Yu Gangban and roll surface oil film formation, to provide the necessary lubrication of rolling, cooling and cleaning effect. As a result, the performance of the emulsion on the relationship between the strip surface cleanliness is very important, directly affects the surface quality of cold rolled products. 1. 2 emulsion system working process of the mill outlet dirty emulsion recycling bins after collecting plate into the underground, under the action of lift pump to the flat bed filter box, again after filters under the action of gravity flow to the sludge tank ( Magnetic filter box) , after filtering iron powder through the diaphragm tank overflow to the middle, in the middle out after the oil tank overflow tank to the net, finally the for breast pump to the cooling and lubrication at the entrance of rolling mill, finally realizes the recycle. The problems existing in the system of 2 1500 mm emulsion in lai steel circulation 1) Emulsion box adopts the old steam coil heating mode, complete complex heating steam pipeline, easy to cause cracks in the steam pipeline oil sludge sedimentation and harden and clean up the difficulties, steam heating efficiency is low. 2) Control temperature, liquid level control valve opening and closing of all stripes are need post workers ran to the emulsion from mill work station station to manually adjust, if the index is not stable, will often cause a lubrication, owe the problem such as volatility, lubrication, emulsion concentration appeared thin specifications paste side, the high temperature deformation area sticking or steel belt rupture caused by such accidents. 3) Slop tank there is a loop 'corner, easy to form a large number of oil slick, greatly reduce the service life of the emulsion and the quality, often open time of magnetic filter, not only increase the fuel consumption, also caused the insufficient lubrication. 4) Horizontal magnetic filter run unstable, iron powder removal ability is not strong, directly affect the cleaning performance of the emulsion, and pitting is easy to appear when rolling roller, roll change frequently, increased the roll consumption, reducing the production efficiency. Dirty oil can't remove at the same time, the strip surface residual oil is more, affect the surface quality of the product. 3 the solution 3. 1 case temperature and liquid level automatic control demolition of emulsion laid the steam coil, instead of outside the enclosure plate heat exchanger, broaden the internal space, reduce sludge precipitation gathered themselves together, and at the same time change the magnetic level gauge turning to ultrasonic liquid level meter, the detection of temperature and liquid level and the water valve chain, realize automatic control of temperature and liquid level, temperature and liquid level display and will be on the master control room computer, the real-time detection of emulsion, cut down the consumption of steam and desalting water, and ensure the mill lubrication and cooling effect to eliminate the thin paste edge when production. 3. 2 to modify dirty oil circulation-filtering increased a 15 kw in the slop tank agitator, around the magnetic filter are closed, open area in contact with the emulsion to reduce oil contact with the magnet, reduce the waste rolling oil, at the same time will be imported into 'L' type tube and in emulsion enters, the formation of air bubbles, facilitate circulation and emulsion flow, reduce the formation of the oil slick. 3. 3 filling water mouth, refueling position improvement will be set up in the net inside the fuel tank filler, closed to erect pipeline, connect the filler in the slop tank, thus avoiding the emulsion caused by water temperatures in question; Also, set the original refueling tank in the middle of the change in net tanks, added that the rapid cycling into the mill rolling oil, improve the lubrication effect. After optimization of filler, filler improvement, completely eliminate the by emulsion abnormal temperature, the concentration fluctuations caused by large rolling accident. 3. 4 emulsion magnetic a transformation of the sewage tank body structure, make the ground sewage tank body by a simple collection tank as a coarse filter, blocking the large particles qualitative leakage; At the same time, the horizontal pneumatic magnetic filter before the demolition transformation for demagnetization ability stronger, running more stable vertical magnetic filter. After modification, the sludge tank decontamination ability is stronger, the overflow into the fuel tank in the middle of the emulsion clean are improved greatly. 4 effect through the above a series of technical reformation, cure the emulsion system filtering ability is low, high content of iron powder, emulsion issue such as difference of cleanliness, judging from the colour of the emulsion, 'mud water into a' ivory, received obvious effect. After transformation, can not only improve the quality of the strip surface and also improves the production operation efficiency, and reduce the roll consumption, created a considerable economic benefits. （ Source: the home of metallurgy)