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Description Of Pickling Process(二)

- Aug 20, 2018 -

Description of pickling process(二)

    B. Rinsing processThe entire rinsing tank is designed as a whole and forms an integral area with the pickling tank.

    The rinsing area consists of 5 sections of the same rinsing section. The rinsing section is separated by the roller. 2 pairs of roller are installed at the outlet of the rinsing area.Each rinsing section is provided with 3 pairs of nozzles (only 2 pairs are different for the high-pressure rinsing section) and is supplied by a circulating pump. These nozzles are used to rinse the upper and lower sides of the strip. Pump support is also in the rinsing section. The cascade direction of rinse water is opposite to that of strip steel. The cascade occurs between the pump supports of each rinsing section.In the last rinse section, condensate or desalted water is used as rinse water. The injection volume is minimum 15001/h, from the last one, the additional nozzle of the segment is sprayed onto the strip.At the minimum running speed of strip steel, the above water amount is less than required. In the second-to-last rinse section, a conductive measuring device is connected to the automatic system to automatically increase the amount of rinsing water according to the speed of the strip.The electrical conductivity measurement device of the fourth rinsing section ensures a certain electrical conductivity, thus ensuring a certain cleanliness of the strip. After properly designed and functionally perfect rinsing section, the strip surface contains not only residual chloride, but also residual small bright iron sheet, carbon, carbide, etc. The current standard is 50mg/m of strip surface.To reduce residues, a high-pressure nozzle collector is installed on the fourth rinse sectionSteam nozzles are installed in sections 3 and 5 of the rinsing section and are heated by direct steam injection to dry the strip.