Localization of supercritical units currently designed, ultra-supercritical units are equipped with pre-filter. Prefilter are tubular filter element filter, i.e. the filter element is installed a number of filtered water to enter from the outside of each filter element, a porous filter element from the center of the fluid in the pipe, the impurities are trapped in the filter element surface. Pre-filter filter element mainly in two forms, while laying the filter element with a wound, with folded filter element is not laying. Folding precision filter element when the unit starts 10μm, during normal operation the filter element precision 2μm or 5μm. My filtration technology company with many years of experience and with reference to foreign materials development and production of folding filter element can effectively control the condensation of water and silicon metal and other solid contaminants. Effectively avoid the unit starts to form at high temperature oxide dissolved state, greatly reducing start-up time of the unit, effectively shortening the water reached the required start-up time during the unit. I. Features ● high precision, large filtration area, through large and small diameter devices, small footprint; ● using the threaded connection, easy installation; ● can be cleaned using a long life cycle. Second, the technical parameters of the filter element to start running index content filter element filter element shape 2.5 "× 70" 2.5 "× 70" filter element material PP PP filter element skeleton reinforced PP reinforced PP filtering accuracy 10um, 2um, 5um, filter area 6.5m2 6.5 m2 filter element in the form of folding folding maximum use temperature of 60 ℃ ~ 80 ℃ 60 ℃ ~ 80 ℃ maximum flow of 3.5 ~ 4.5m3 / h / root 3.5 ~ 4.5m3 / h / root