A problem with an evaporator
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There is a set of tubular falling film evaporators that use a six-effect counter-current direct preheating system combined with four-stage flash evaporation. Fresh steam is introduced in the first effect to heat the material. Questions: 1. What is the optimal opening degree of the valve (Valve 1), which is used to divert the condensate water from the first-effect condenser tank to the second tank? An oversized opening leads to waste, while a smaller opening helps save steam – but could this affect the efficiency of the unit? 2. What are the advantages and disadvantages of valves 1, 2, and 3 having opening degrees all greater than 50%, or all less than 25%?
An excessive opening size will definitely have an impact; it’s as if not all of the steam is heated, and accordingly, the heating effect will be significantly reduced. We usually install a U-shaped bend at the back and then use it as a pipe sightglass to observe and determine the valve opening degree.
Place a U-shaped bend at the back, and then use it as a pipe sightglass to observe and determine the valve opening degree. I would like to ask if there is a schematic diagram for this? Could you please give some guidance?
If the opening is too large, air will enter the condensate pipe, meaning that the heating steam used in that stage is not utilized fully, which results in heat loss.