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  • Sunday, 16 October 2016

    Vacuum Steam Technology



    Hello guyzz.... first of all happy Weekend to all.......!!

    Today i gonna explain you a emerging technology, which is simply a revolution in industries and which is very hard to believe by all, i.e., Vacuum Steam.

    Now, i'll explain you its features briefly, it is simply  a low temperature steam produces at a high pressure and later the pressure will be reduced with an equipment like inlet control valve or a pressure reducing system which can reduce the produced pressure very rapidly like a vacuum pump. 

    May be its very difficult to believe the above and i'll tell you that we can produce this with the help of steam from boiler, and even we can automate it with just two interlock systems.


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    The higher the pressure, the higher the temperature of saturated steam. At regular atmospheric pressure, saturated steam is roughly 100°C. Saturated steam generated from boilers, however, is generally much higher in temperature because it is generated at higher pressures. This steam (positive pressure steam) is therefore frequently used in industry for heating processes requiring temperatures above 100°C.
    Alternatively, producing saturated steam for heating processes below 100°C is also possible. Such steam is often referred to as vacuum steam because it requires pressures below regular atmospheric pressure. Vacuum steam is generally generated at higher pressures after which pressure is reduced by using equipment such as an inlet control valve. A vacuum pump is also usually used to help achieve lower pressures at start-up and enable the smooth release of condensate.
    Use of vacuum steam requires careful temperature and pressure reading. To determine steam temperature, referring to a steam table such as the one above is recommended. For example, through this steam table, we can see that if a process requires saturated steam at temperatures of 60°C or 90°C, saturated steam pressures should be set to 19.946kPa and 70.182kPa, respectively.

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    How to Generate the Vacuum Steam.....??

    All you need is a pressure reducing control system and a vacuum regulator with a HMI(Human Machine Interface), 

    Purpose of Pressure Reducing control system:

    When the steam enters the chamber containing water, then the water will gets heated up and then a secondary steam will start generating, then the pressure of the secondary steam will be similar to that of the external steam and we have to produce steam of temperature 83 deg C, 




    so as per steam tables the pressure corresponding to 83 deg C temperature will be 410 mmHg abs, so the external steam should be turned off when ever the produced secondary steam pressure reaches 410 mmHg, so to control the inlet pressure of the external steam, a pressure reducing control system is used.

    Purpose of Vacuum regulator:

    Usually vacuum regulator works on the principle of Air to close Diaphragm system, whenever the generated secondary steam pressure exceeds 410 mmHg, immediately the vacuum regulator will starts it work and opens,




     then by the suction pressure of the vacuum the generated secondary pressure will be reduced to 410 mmHg, So to reduce the produced secondary steam pressure, a vacuum regulator is used.

    Purposed of HMI(Human Machine Interface):




    The use of HMI is very simple, it will co-ordinate with both the valves at a time and make them work alternatively with a set point, the set point will be set by the operator based on saturated steam tables data.

    You can use the follow link to generate the Steam temperature by giving the steam pressure as input.   Click Here

    Advantages of Vacuum Steam over Regular Steam and Hot Water:

    1) Vacuum steam can be generated at required Low temperatures, which will hold the energy equivalent to the regular Steam and much higher than the energy of Hot water,

    2) The time cycles of operations like distillation, drying, heating can be reduced without affecting the quality of the manufactured product,

    3) The Efficiency of the Vacuum steam is much higher than that of the Regular steam and Hot water as Vacuum steam will support RAMP Heating, which is recommended for pharma operations.


    That's it......!!! This is all about Vacuum Steam, hope everyone who read this should have understand,

     if you want to add up something about Vacuum steam just mail me,

    Comments are most appreciated.....!!


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    About The Author


    Hi! I am Ajay Kumar Kalva, Currently serving as the CEO of this site, a tech geek by passion, and a chemical process engineer by profession, i'm interested in writing articles regarding technology, hacking and pharma technology.
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