Development of Anti-Scaling Technology in Spraying Water System

摘要

Scaling is the deposition of mineral solids on the interior surfaces of water lines and on equipment surfaces that cause clogging of water pipelines and a reduction of equipment efficiency. There were scaling problems in the spraying water system of China Steel (CSC) including on the Top Gas Pressure Recovery Turbine fans (TRT fans) in the Blast Furnace Facility, on the Induced Draft fans (ID fans) in the Basic Oxygen Furnace Facility, and on the nozzles of the bloom marking machines. The efficiency of TRT fans and ID fans were decreased, and the markings on the blooms were unclear due to scale deposition. Three strategies were approached separately or in combination to reduce the scale level. First, the concentration of suspended solids in spraying water had to be controlled under 10 ppm. Second, the most suitable scale inhibitors were selected and applied. Third, the magnetic anti-scaling devices developed by CSC were applied on to the water pipelines. The efficiency of TRT fans and ID fans was increased and the consumption of operating power was reduced after the application of the anti-scaling technology. After improvement, the clogging frequency of nuzzles on the bloom marking machine was reduced and the markings on the blooms were clearer.