Piping for the first and second stage evaporator coolers
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This post was last edited by lxq700918 on 2009-12-24 at 17:53. It involves a scale of 30, using a CO2 stripping process; the evaporation stages 1 and 2 are now in the equipment review phase. The design institute proposed using circulating water for cooling directly, but considering other operating units and the amount of circulating water required, it is desired to follow the piping arrangements used in those units: that is, the circulating water should first flow into the first cooler of stage 2, and then proceed in series to the cooler of stage 1. Regarding this issue: 1. What impact do these two approaches have on vacuum levels during operation? II: If separate cooling as provided by the design institute is chosen, by how much will the circulation water volume increase? Three: If it is changed to a series piping arrangement, do the pipe connections of those two heat exchangers need to be enlarged? IV: The current design of the two units features circulating water flowing through pipes in the same direction as the evaporated steam; is it necessary to adjust the location of the device interfaces?
1: What is the impact of each on the vacuum in terms of operation? Answer: The key is to determine the heat exchange area of these two condensers. Theoretically, when using a series configuration, the heat exchange area should be slightly larger ； On the contrary, it should be smaller. If the heat exchange area of an evaporation condenser is large enough, it will have no significant impact. II: If separate cooling as provided by the design institute is chosen, by how much will the circulation water volume increase? Answer: For the heat load of an evaporation condenser, approximately 228 tons of circulating cooling water are required per ton of urine. Three: If it is changed to a series piping arrangement, do the pipe connections of those two heat exchangers need to be enlarged? Answer: The key is to know how many pipelines currently exist Are the nozzles of these two devices the same size? If they are different, it is best to scale it up according to the largest pipe diameter. IV: The current design of the two units features circulating water flowing through pipes in the same direction as the evaporated steam; is it necessary to adjust the location of the device interfaces? Answer: They should be different; the cooling water flows in a “U” shape through the heat exchanger, and it is recommended not to change the device connections.
The condensation temperature of the two-stage first condenser is 46 degrees, while that of the one-stage condenser is 71 degrees. It’s better to first use the two-stage first condenser and then the one-stage condenser; the piping system is simpler this way. Why make it so complicated?