The full low pressure liquid air separation plant uses molecular sieve adsorption and purification, pressurized turbine expander refrigeration, regular packing on the tower, hydrogen-free hydrogen production, oxygen and nitrogen outside the compression process.
Before the liquid air separation plant is sand stripped, a sand stripping plan and contingency measures are developed. Training for external construction teams, for all kinds of maintenance work tickets, etc. Firstly, open all the manhole covers at the top of the main exchange and cold box, then open 300 holes on the third manhole door at the upper part of the cold box, use cloth bags to divert the flow to the ground, top-down layered sand picking, and regularly go up to the top of the cold box to see whether the pearl sand drop is normal. Workers pick out about 200m3 pearl sand, see the main tower and nearby frozen pearl sand, then stop picking sand, under the premise of safety measures in place, into the two people with shovels, pickaxe to break the frozen sand blocks, about 5m. workers finished breaking continue to pick sand work. Obviously the moisture content of the pearl sand piled up separately no longer reuse. After four days, the sand raking was completed and the tower was swept to provide a suitable working environment for the maintenance personnel in the cold box.
Dear small air separation unit, large air separation unit and liquid air separation plant engineering team, according to the characteristics of different volumes of small air separation unit, large air separation unit and liquid air separation plant , design different solutions.
