Few days back, I searched for this.,Try:
1) google search for distillation tray design.
2) Henri Kister's Distillation books( design & operation) and if you can talk to Koch-Glitsch, they had a free software (now I could not see it)
3) Perry's universal reference handbook..
Koch Glitsch still offers KG-Tower, it's software for evaluating their trays/packings. this is NOT a tool for designing a column, it is just used to evaluate trays/packings concerning KNOWN fluid loads.
it just is my career to design column trays. I think experience is the same important as hydraulics models if you want to design a good trayed column.if you have more information about the column design avaialble, I'd like to give more advices.