The issue of the flow rate of alkaline solution in ion membrane evaporation
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Why can’t the flow rate of the alkaline solution in ion membrane evaporation be increased in the second-effect evaporation tank? Is it a problem with the pump itself? Any other questions? (We use a three-effect counter-current evaporation process there.) I hope everyone can help answer this question. It’s very urgent. Thank you.
Has the pump reached its maximum capacity? Are both the outlet valve and the control valve fully open? Analyze and rule out the issues based on the piping and the pump itself.
Our production capacity is 200,000 tons per year. It is now only operating at 50 m³/h (which is less than five-sixths of the designed capacity). Can’t the actual production capacity always be slightly higher than the designed capacity?
Reply to 3# Galaxy: It’s usually the case that the actual value is slightly higher than the designed value. However, there are also cases where the actual value does not meet the design value.
Is it only a problem with the pump? Could it be that the pipeline design is unreasonable?
First, check the capacity of the pump and the inlet and outlet valves; if there are no issues, then examine whether the heat exchanger has been corroded, which could lead to cross-flow between streams and result in flow rates that do not meet the requirements. Our company faced a problem some time ago: the flow rate did not meet the expected levels. After repeated inspections, it was found that the cause was corrosion of the heat exchanger and cross-flow of liquids!
Reply to 5# Galaxy: You can calculate it using the thinnest part of that pipeline; it should be possible to determine it.
You say it might be pump cavitation? Our second effect operates under negative pressure.