Problems with water vapor plate heat exchangers? ? ? Urgent urgent urgent
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Guys, I’ve come across a project. The water is heated to 80°C using municipal steam. There is one issue I don’t understand: the pressure gauge at the steam inlet of the heat exchanger shows 0.8 Mpa, while the temperature is 156°C. Enter the plate heat exchanger to heat the cold water. Its calorie value needs to be calculated. The temperature of the water at the steam condensation outlet is 90°C. I checked the steam table; the saturated temperature corresponding to 0.8 Mpa is around 170 degrees. So at 156°C, should it still be in a hot water state or a mixture of water and steam? If it is a soda mixture, how can the amounts of steam and condensed water in it be calculated? Do you want to know the dryness value? I need to calculate the enthalpy of this steam, minus the enthalpy of the condensed water. Estimate the heat value of the steam. I would appreciate some guidance from the experts here.
The Shandong Hanhua coiled-tube heat exchangers designed for soda water heat exchange offer good safety, a low temperature for condensate discharge, low energy consumption, easy installation and maintenance, a low scaling coefficient, low cleaning and maintenance costs, a long service life, and an attractive appearance
This post was last edited by yuchenchf on 2017-5-18 09:09. Plate heat exchangers are suitable for use in water-to-water heat exchange applications! For soda heat exchange, a spiral-wound tube heat exchanger is the better choice!
For soda heat exchange, a spiral-wound tube heat exchanger is a better choice
This post was last edited by Watt Energy Saving on 2017-5-17 23:50. It can be determined that the saturated steam temperature corresponding to a gauge pressure of 8 barg is 175.4 degrees. Then one of the readings on your thermometer or pressure gauge must be wrong. Because regardless of the moisture content (dryness degree) in the steam, its temperature is always the saturation temperature. In other words, even if the moisture content ranges from 0% to 90%, as long as the pressure gauge reads 8 barg, the temperature will always be 175.4 degrees. For example, regardless of the water level in the boiler, as long as the steam pressure is 8 barg, the steam temperature will always be 175.4 degrees. There is only one exception: when the steam contains non-condensable gases such as air at a pressure of 3.4 barg, then a gauge pressure of 8 barg will be indicated (4.6 barg of steam + 3.4 barg of air), but the temperature will still be 156 degrees. The amount of water present in the steam does not affect the temperature, but it does affect the enthalpy value. The calculation method is: total heat of wet steam = latent heat enthalpy * dryness fraction + sensible heat enthalpy. I hope this helps you; Hangzhou Watt Energy Saving is always here to assist you with steam energy savings!
Impressive, you’ve learned it! This is a parameter related to the project; of course, we don’t actually test or check the quality of the steam. But according to what you said, it has resolved some of our previous doubts. Thank you again to those who are not familiar with steam heat exchange.
There’s one more small issue: assuming the table is correct, it might contain other non-condensable substances. So, what is the volume occupied by steam approximately, and how is that calculated? I didn’t check the information online
Make sure your initial conditions are correct; check with your owner again.
Thank you. It’s difficult to confirm the parameters with the owner; for now, only these two values are available