How should the amount of non-condensable gas in MVR evaporation be determined?
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This post was last edited by gn_1984 on 2015-6-27 06:57. I have been learning about the design of MVRs recently, and I’m really unsure as to how much of the non-condensable gases in the MVR evaporator should be sent to the condenser! Also, a small amount of steam is still supplied after the MVR starts up; is this amount of steam calculated based on heat losses or by some other method? If calculated based on heat loss, what is the typical value for heat loss? PS: Friends who are interested in MVR technology are welcome to communicate and improve together!
Hello, I have also been learning about MVR recently. Was the owner’s MVR design created using software simulation? Should we still use the manual calculation method?
For gas-liquid separation, it is advisable to use a scrubber tower.
I’m doing that too; thermal compensation is used to maintain the stability of the system, such as pressure and temperature. The feed temperature can be maintained to ensure system stability. :)
Material energy balance; based on pilot-scale tests, it is only possible to make estimates
At the moment, this is also estimated, but fortunately our several systems are currently being tuned accurately, and we will have empirical data once that is done.
Based on engineering experience and the results of pilot tests, it is possible to estimate the pumping capacity of the vacuum pump; the amount of steam that needs to be added additionally also depends on the heat loss in the insulation and throughout the entire system
The amount of non-condensable gas depends mainly on the materials involved; in other words, it’s important not to remove too much steam, as doing so will increase the load on the condenser, and steam will have to be added back again, resulting in an increased consumption of steam.
Leave some extra margin during design, and just be more careful with control during operation.
An excessive accumulation of non-condensable gases is what affects the evaporation process; usually, it’s possible to control the amount drawn by reducing it, and once the evaporation effect improves, adjustments can be made as needed.