We have revamped sulfur desulfurizer、saturation hot water tower、copper liquor scrubber、carbamide stripper、big diameter granular car amide column scrubber、methanol fractionating rectifying tower in fertilizer industry. for sulfur desulfurizer, after revamping we achieve effect like low sulfur in desulfuriz gas、few losing in CO2、low quantity of absorbent, greatly increase the ability and effect of desulfuriz. For saturation hot water tower , we can obtain effect like improve the effect of heat transfer、increase the quantity of self produced steam、enhance the capability of production、reduce the quantity of steam supply, play down the use of energy. copper liquor scrubber is a high pressure equipment, in the process of revamping we adopt the patent of Tianjin university , all internal are not weld on tower, after revamp the quantity of copper liquor cycled in system are reduce 20% of the quantity before revamp, the ability of produce increase 20%. In the revamp of carbamide stripper, we use high efficiency packing to replace float valve tray, after revamp we can get such result as the increase of yield、the augmentation of operate flexibility、good separation effect, the quantity of ammonia in waste residue is eligibility, the increase of NH3 and CO2 percent recovery; Methanol is the main byproduct of nitrogenous fertilizer factory, after revamp of methanol rectify tower it’s production can reach the high-class products of national standards and revamp can improve output of methanol reduce the use of energy.