Abstract:In order to study the main technology and economy of direct air-cooled unit driven feedwater pump project,an Inner Mongolia plant expansion of 2×660 MW direct air cooling unit is taken as an example of designing the spindle drive water pump project,through the investment payback period method,comprehensive technical and economic comparison of 1×100% capacity plan of water pump and traditional spindle drive the traditional 3×35% capacity pump scheme,1×100% capacity steam pump scheme.Through demonstration,although the main drive water pump of each unit increases initial investment of 29 million 600 thousand yuan,the annual net income can increase by 53 million 677 thousand yuan,which means the costs can be recovered in less than 0.6 years,with good technical and economic features.