Applied Vacuum cc

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Address
14 Anne St
Johannesburg
Gauteng  2192
South Africa
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Phone
+27 11 485 2025/6
Fax
+27 11 640 5391
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Website
http://www.appliedvacuum.co.za/


Applied Vacuum cc

Steam Ejectors are industry standard workhorses using steam to raise vacuums down to 0.1 mbar. Vent and Blowdown Silencers eliminate excessive noise created by the discharge of high pressure gases and steam into the atmosphere. The design is eactive / absorptive. Steam Desuperheaters can be a simple spray type or, in the case of large turn down ratios, steam atomising type. Injection Heating of liquids with steam, either intank or inline, is noiseless and free of vibration. Liquid Eductors use liquid to induce flows of either liquids or gases and are used in mixing and transfer applications. Steam Jet Refrigeration uses ejectors to safely cool liquids to temperatures as low as 2 deg C. Mixing Nozzles will entrain a flow of 4 times the pumped volume and are economical way to mix large tanks.

Steam Ejectors are the simplest means available today for vacuum - raising applications. The Steam Ejector utilizes high pressure steam to compress low pressure vapours or gases. This creates a vacuum in a vessel or chamber to which the ejector is connected. The fundamental operation of an ejector is shown in the illustration right:

Steam at pressure Pi expands through a nozzle and exits at very low pressure (Px) and at very high velocity. The low pressure induces a flow of load vapours at a pressure (P1) into the ejector. The two streams i.e. the low pressure, high velocity steam from the nozzle, together with the slower, entrained load vapours, will mix as they converge into the throat of the ejector. Upon leaving the throat, the gases slow down and regain pressure to a pressure P2.

The load gases have been compressed from their original pressure P1 to a new pressure, P2. We define the compression ration for this ejector as P2/P1. If Ws kg/hr motive steam are required to entrain and compress Wl kg / hr of load vapours, we define the entrainment ratio for this ejector as Wl/Ws. These ratios are computer calculated and are the key parameters in ejector design.

In practice, for suction pressure below 100 mbar absolute, more than one ejector will be used, usually with condensors between the ejector stages. Condensing of motive steam greatly improves Ejector Set efficiency. We supply both barometric and shell-and-tube surface condensors for this purpose.

APPLIED VACUUM have been involved in designing, fabricating and commissioning multi-stage Ejector Sets since the mid 1970's. Our computerised designs yield steam and cooling water efficiencies which are comparable to those offered by manufacturers worldwide.

We have supplied Multi - stage Ejector sets fabricated in Carbon Steel, Stainless Steel, Titanium, PTFE, Carbon and others. The Ejector Sets operate in a range of suction pressures down to 0,3 mbar absolute, and carry loads of up to 1000 kg/hr.

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